The fan is divided into an axial flow fan, a centrifugal fan and a diagonal flow (mixed flow) fan according to the flow direction of the airflow after entering the impeller.
The fan can also be divided into single-stage, two-stage or multi-stage pressurized fans according to the form of pressure. For example, 4-72 is a single-stage pressurization, and a high-end fan is a multi-stage pressurized fan.
Fans can be divided into: axial flow fans, mixed flow fans, roof fans, air conditioning fans, etc. according to the purpose.
The fan can be divided into a negative pressure fan, a low pressure fan, a medium pressure fan and a high pressure fan according to the pressure.
According to the outlet pressure (boost), it is divided into: fan (â?¤ 15,000 Pa), blower (1.5 to 350,000 Pa), compressor (â?¥ 350,000 Pa) [7].
Sort by layer
There are many classification methods for ventilators, which can be roughly classified by the following types:
(1) According to the level of pressure generated, it can be divided into: volumetric type: reciprocating type and rotary type; turbine type: centrifugal type, axial flow type, mixed flow type and cross flow type, and jet type.
Fans generally refer to turbine type, ie, centrifugal, axial, mixed flow, cross flow, and the like. [1]
Its main features are:
Centrifugal fan: higher pressure, but less air.
Axial fan: Higher air volume, but lower pressure.
Mixed flow fan: The air volume and pressure are between the centrifugal and axial fans.
Cross-flow fan: It has a high dynamic pressure and can get a flat air flow.
(2) According to the different materials used, it can be divided into: iron shell fan (common fan), fiberglass fan, plastic fan, aluminum fan, stainless steel fan, etc.
(3) According to the direction of gas flow, it can be divided into centrifugal type, axial flow type, diagonal flow type (mixed flow type) and cross flow type.
(4) The flow direction after entering the impeller according to the airflow can be divided into: axial flow fan, centrifugal fan and diagonal flow (mixed flow) fan.
(5) According to the application, it can be divided into: the push-in partial fan and the explosion-proof motor are placed outside the flow channel or in the flow channel, and the explosion-proof motor is placed in the explosion-proof sealed cavity.
(6) It can also be divided according to the form of pressure: single-stage, double-stage or multi-stage pressure fan [1].
TRH-P-201 compact pressure sensor / transmitter
1: It adopts all-stainless steel sealing structure, which has good moisture resistance and excellent media compatibility.
2: Using independent research and development amplifier circuit to greatly improve sensor signal output stability
3: The high reaction speed is adopted, so that the sensor can react to the change of the liquid pressure at any time, and the measurement result is more accurate and error-free.
Application: Widely used in pressure measurement and control of industrial equipment, water conservancy, air compressor pressure, pump water valve, constant pressure water supply.
Range: 0 ~ 0.1 ~ 20 (MPa)
Comprehensive accuracy: ±1%, 0.5%, 0.2%
Output signal: 0.5V~4.5V 4~20mA 0~5V 0~10V 1~5V 1~10V
Supply voltage: +5V DC, 24VDC (9~36V)
Medium temperature: -20 ~ 85 ° C
Ambient temperature: normal temperature (-20 ~ 85 ° C)
Load resistance: Current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance: greater than 2000MΩ (100VDC
Sealing level: IP65
Long-term stability: 0.1% FS / year
Vibration effect: The output changes less than 0.1% FS within the mechanical vibration frequency of 20Hz~1000Hz.
Electrical interface (signal interface): waterproof connector
Mechanical connection (threaded interface): 1/2-20UNF, M14Ã?1.5, M20Ã?1.5, M22Ã?1.5, etc. Other threads can be designed according to customer requirements
Pressure sensor, pressure transmitter is a high-quality pressure sensor developed by Honghua heng, pressure transmitter
Pressure sensor, pressure transmitter price advantage, pressure sensor, pressure transmitter function stable
TRH-212 fire air pressure difference controller (expanded economy type)Pressure sensor for building fire supply, pressure sensor for fire protection industry, fire pressure difference controllerThe wind pressure difference controller is used to control the front room, the front room, the fire elevator front room, and the closed refuge floor. The differential pressure controller normally opens the contact closure, and connects the power supply of the control box of the roof bypass pressure relief valve. The top bypass pressure relief valve is opened for air supply and pressure relief, and the bypass pressure relief valve at the top of the building is opened for air supply pressure relief, reducing the pressure difference, when the pressure difference
The value is reduced to a certain value, the wind pressure difference sensor contact is disconnected, the roof bypass valve is de-energized, and the bypass valve is closed to stop the pressure relief. Exclusive instrument.
Product features are:
1: Using the airbag to expand and pull the high-speed elastic body,
2: After reaching the set pressure, the high-speed action switch point is activated.
3: The way of air source makes the PTJ601 sensor have strong anti-overload capability.
4: There are fine inspection indicators and warning lights on the surface. When working, the inspection indicator green light is on. When the wind pressure is exceeded, the red light is on and there is passive switching action. The main application is in the positive pressure supply of fire. Sense differential pressure control pressure relief valve, residual pressure valve action. There is a small differential pressure control for the purpose of industrial systems. This product is also known as positive pressure air supply sensor, differential pressure measurement controller, wind pressure difference sensor, etc.!
Pressure form: gauge pressure, differential pressure
Measuring range: 0ï½?100pa
Pressure resistance: 10000PA
Accuracy level: 3
Operating pressure: front chamber measurement and control: 25 ~ 30PA, (reset pressure: 15 ~ 20PA);
Stairwell application: 40 ~ 50PA, (reset pressure: 30 ~ 40PA)
Output mode: switching signal (24VDC/4A)
Working voltage: 24VDC
Medium temperature: -20 ~ 85 ° C
Sealing level: IP65
Overload capability: 150% FS
Dimensions: 172*112*60
Weight: 350g
water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid so
Principle: When energized, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the lower part is formed around the closing member. The fluid pressure pushes the closing member upward to move the valve to open; when the power is off, the spring force leads the pilot. The hole is closed, and the inlet pressure passes through the bypass hole. The rapid chamber forms a lower high and high pressure difference around the valve closing member, and the fluid pressure pushes the closing member downward to close the valve.
Features: The upper limit of the fluid pressure range is high, can be installed arbitrarily (customized), but must meet the fluid pressure difference conditions.
2, the difference between the solenoid valve from the valve structure and material and the principle, divided into six sub-categories: direct-moving diaphragm structure, step-by-step direct diaphragm structure, pilot diaphragm structure, direct-acting piston structure, Step-by-step linear motion piston structure and pilot piston structure.
3. Solenoid valves are classified according to their functions: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, miniature solenoid valve, Pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve, etc.
PS lens, plastic lens, single-sided lens, double-sided lens, taped lens, paper lens, semi-lens
detailed information
PS lens
PS (polystyrene-based plastics) refers to a class of plastics including styrene in macromolecular chain, including styrene and its copolymers. Specific varieties include general polystyrene (GPPS), high impact polystyrene (HIPS), EPS and metallocene polystyrene (SPS).
PS lens, in fact, refers to the PS material plate plated after the general term. Generally can be divided into: single-sided mirror, double-sided mirror, taped lens, paper lens, semi-lens.
Advantage
Using plastic instead of glass to make lenses has the advantages of light weight, non-fragmentation, easy shaping and processing, easy coloring, etc. The development momentum is increasing day by day, and it has become a kind of technology in lens production.
type
Plastic sheets can generally be made into: single-sided mirror, double-sided mirror, taped mirror, paper mirror, semi-lens, etc. can be done according to different requirements.
Product characteristics
The product is made of polystyrene as the main raw material and extruded. It can be colored freely, odorless, odorless, non-toxic, non-bacterial growth. It has the advantages of rigidity, insulation and good printability.
purpose
Mainly used in packaging, container equipment, household packaging, general electrical appliances and construction industries.
Characteristic
PS polystyrene decorative board is thermoplastic. The specific gravity is 1.05, the melting temperature is 150-180 C, the absorptivity is low, and the transmittance can reach 88-92%. It is resistant to organic acids, alkalis, salts and lower alcohols, and soluble in esters and ketones.
Acrylic lenses,
whose base plate material is PMMA, also known as pressure afterburner lenses, sub-afterburner lenses, in fact, refers to the general term of PMMA sheet after electroplating, using plastic lenses instead of glass lenses, has the advantages of light weight, not easy to break, easy shaping and processing, easy coloring, etc., the momentum of development is increasing, and has become a kind of technology in lens production. Plastic sheets can generally be made into: single-sided mirror, double-sided mirror, taped mirror, paper mirror, semi-lens, etc. can be done according to different requirements. For example, mobile phones and TV screens are visible everyday.
Because acrylic is difficult to produce and its cost is high, there are many substitutes of high quality and low price in the market. These substitutes, also known as acrylic, are actually ordinary organic or composite boards (also known as sandwich boards). Ordinary organic board is cast with ordinary organic glass cracking material and pigment. Its surface hardness is low, and it is easy to fade. After polishing with fine sand, the polishing effect is poor. The composite board has only a very thin acrylic surface and ABS plastics in the middle. It is easy to delaminate due to thermal expansion and contraction in use. The true and false acrylic can be identified from the slight chromatic aberration and polishing effect of the plate section.
1. Architectural Applications: Shop Window, Soundproof Doors and Windows, Lighting Hood, Telephone Booth, Decorative Color Mirror, etc.
2. Advertising applications: light boxes, signboards, signboards, exhibition shelves, etc. 3. Traffic applications: train, car backup mirror, car lens, etc.
4. Medical applications: baby care box, various surgical medical appliances and civilian articles: handicraft, cosmetic mirror, bracket, aquarium, toy mirror, etc.
5. Industrial applications: instrument surface plate and cover, etc.
6. Lighting applications: fluorescent lamp, Pendant lamp, Street lampshade LED reflector, acrylic reflector, etc.
If you need proofing, please give specific size specifications drawings.
Step-by-step direct-acting solenoid valve
Principle: It is a combination of direct motion and pilot type. When there is no pressure difference between the inlet and the outlet, after energization, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upward, and the valve opens. When the inlet and outlet reach the starting pressure difference, after the energization, the electromagnetic force leads the small valve, the pressure of the lower chamber of the main valve rises, and the pressure of the upper chamber drops, so that the main valve is pushed upward by the pressure difference; when the power is off, the pilot valve uses the spring The force or medium pressure pushes the closure and moves down to close the valve.
Features: It can also be operated at zero pressure difference or vacuum or high pressure, but the power is large, and it must be installed horizontally.
Pilot solenoid valve
Principle: When energized, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the lower part is formed around the closing member. The fluid pressure pushes the closing member upward to move the valve to open; when the power is off, the spring force leads the pilot. The hole is closed, and the inlet pressure passes through the bypass hole. The rapid chamber forms a lower high and high pressure difference around the valve closing member, and the fluid pressure pushes the closing member downward to close the valve.
Features: The upper limit of the fluid pressure range is high, can be installed arbitrarily (customized), but must meet the fluid pressure difference conditions.
2, the difference between the solenoid valve from the valve structure and material and the principle, divided into six sub-categories: direct-moving diaphragm structure, step-by-step direct diaphragm structure, pilot diaphragm structure, direct-acting piston structure, Step-by-step linear motion piston structure and pilot piston structure.
3. Solenoid valves are classified according to their functions: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, miniature solenoid valve, Pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve, etc.
pc board
Also called polycarbonate board, capron board. Weak acid resistance is made of polycarbonate and co-extrusion technology CO-EXTRUSION. It shows that PC board is resistant to neutral oil, strong acid, alkali and alkali, and coated with UV. However, PC sunshine panels (also known as polycarbonate hollow panels, glass capron panels, PC hollow panels) are processed from high-performance engineering plastics - Polycarbonate (PC) resins. They are characterized by high transparency, light weight, impact resistance, sound insulation, heat insulation, flame retardancy and aging resistance. They are a kind of high-tech, excellent comprehensive performance, energy-saving and environmental-friendly plastic panels. Material is a plastic building material widely used in the world at present. It has incomparable advantages compared with other building decoration materials (such as glass, plexiglass, etc.).
Classified editor
PC board generally refers to PC sunshine board and PC endurance board, PC wave tile and PC sunshine shine tile and PC synthetic resin tile. Sunshine board is a hollow multi-layer or double-layer.
Mainly used in: gardens, entertainment venues, strange decoration and lounge pavilions;
The interior and exterior decoration of commercial buildings and curtain walls of modern urban buildings;
Transparent air containers, front windshields of motorcycles, aircraft, trains, ships, automobiles, motor boats, submarines and glass military and police shields;
Layout of telephone booths, billboards, light boxes, exhibitions and exhibitions;
Instruments, instruments, high and low voltage switch cabinet panel and military industry, etc.
High-grade interior decoration materials such as walls, roofs and screens;
Sound barrier of Expressway and urban elevated road;
Agricultural greenhouse and aquaculture greenhouse;
Eco-restaurant roof;
PS board is commonly known as "organic board"
PS board is made of polystyrene as the main raw material and extruded. It can be freely colored, odorless, odorless, non-toxic, non-bacterial growth. It has the advantages of rigidity, insulation and good printability. It is mainly used in packaging, container equipment, daily decoration, general electrical appliances and construction industries.
PS board is commonly known as "organic board". Its chemical name is Polystyrene polystyrene. Its density is 1.02~1.08. It is a thermoplastic with high transparency (transparency is second only to that of plexiglass), excellent electrical insulation, high frequency insulation, brittle quality, impact resistance, weatherability and aging resistance are worse than those of plexiglass. Its mechanical and thermal processing properties are inferior to those of plexiglass. General chemical corrosion, chemical stability, hardness and organic glass is similar, water absorption and thermal expansion coefficient is less than organic glass, the price is lower than organic glass.
Characteristics and uses:
The product is made of polystyrene as the main raw material and extruded. It can be colored freely, odorless, odorless, non-toxic, non-bacterial growth. It has the advantages of rigidity, insulation and good printability. It is mainly used in packaging, container equipment, daily decoration, general electrical appliances and construction industries.
PS polystyrene decorative board is a kind of polymer organic board extruded by polystyrene granular moulding plastics on the extruder.
Feature editor
PS polystyrene decorative board is thermoplastic. The specific gravity is 1.05, the melting temperature is 150-180 C, the absorptivity is low, and the transmittance can reach 88-92%. It is resistant to organic acids, alkalis, salts and lower alcohols, and soluble in esters and ketones.
The flow sensor is a high-quality flow sensor developed by Honghuayi.The flow sensor is a high-quality flow sensor developed by HonghuaHeng.The flow sensor is a high-quality flow sensor developed by Honghuayi.
Flow Sensors Electromagnetic flow calculation instrument, water flow capacity calculation instrument, liquid pipeline flow calculation instrument, electromagnetic working flow sensorproduct description
A gauge that measures the flow of a conductive fluid.
1.2 Electromagnetic flowmeter has the following characteristics
Unaffected by changes in fluid density, viscosity, temperature, pressure and conductivity, the linear measurement principle enables high-precision measurements;
There is no obstruction and moving parts in the measuring tube, the pressure loss is small, so it will not cause additional energy loss, and will not cause blockage.
It is especially suitable for the measurement of liquid-solid two-phase flow media such as sewage, mud, slurry, pulp, etc.
The installation requirements are low. The front straight pipe section only requires 5D, and the rear straight pipe section is 2D (D is the inner diameter of the selected instrument)
Nominal diameter DN3-DN3000 Covering a wide range, lining and electrodes have a variety of options to meet the requirements of measuring a variety of conductive flow;
With MODBUS-RS485, HART, GPRS and PROFIBUS and other communication signal output (optional)
The converter adopts 32-bit embedded microprocessor, full digital processing, fast calculation speed, strong anti-interference ability, reliable measurement, high precision, measurement
Range up to 1500:1
High-definition backlight LCD display, full Chinese menu operation, easy to use, easy to operate, easy to learn and understand;
With conductivity measurement function, it can judge whether the sensor is empty or not, and has self-test and self-diagnosis function;
The internal calculator can display positive cumulative flow, reverse cumulative flow and instantaneous flow respectively.
Plug-in electromagnetic flowmeter, easy to install, can continuously flow the field with pressure opening, has absolute installation advantages and price advantages.
1.3 Main applications
An electromagnetic flow meter can be used to measure the volumetric flow of a conductive fluid in a closed conduit. Widely used in petroleum, chemical, steel metallurgy, water supply and drainage,
Flow measurement and control in industrial and agricultural production processes such as water irrigation, water treatment, environmental sewage control, paper making, medicine, food, etc.
Use environmental conditions
