Operating Characteristics of Steam Jet Pump Extraction System

Steam jet pump is the use of high-pressure steam after the nozzle acceleration, get supersonic airflow, into the mixing chamber, causing low pressure in the mixing chamber, will be pumping gas (or steam) inhalation, and with the momentum and energy exchange, into the diffuser ; In the diffuser contraction section, the pressure of the mixed gas increases, the speed drops to reach the throat of the diffuser, the velocity of the mixed gas stream drops to the vicinity of the sound velocity, and in the diffuser expansion section, the speed is further reduced to the exit speed Close to zero, at this time, the pressure of the mixed gas is higher than the outlet pressure of the pump to be excluded, so as to achieve the purpose of pumping. Working steam through the nozzle expansion, if the pressure at its outlet is much higher than the pressure of the gas being pumped, the working steam due to over-expansion of the jet dispersion, this time without pumping effect; if the pressure at the outlet than the ratio Pumping gas pressure is much lower, then the working steam is compressed, forming a cylindrical jet in the nozzle and can not block the flow channel, resulting in exhaust chamber and suction chamber "short circuit" at this time also does not have the role of suction. Multistage jet pump in all pump has its own pumping curve, each stage of the pump work along their respective suction pressure, exhaust pressure and pumping capacity of the characteristic curve changes, in order to ensure the stability of pumps at all levels, the requirements During the working process of the system, the parameters of the steam system and the condensate system of the pump should be kept as constant as possible. When the status parameters of the working medium fluctuate within the allowable range, the suction pressure and discharge pressure of the pumps at all levels will be within the appropriate range Internal changes, will not affect the normal operation of the jet pump system, but the work of the state parameters of the general changes caused by jet pump instability. In order to ensure the stable operation of multi-stage pump system, all the pumps in the system should be well matched, so that each level of pump is at its own working point, so as to prevent one of the pumps from operating under overload condition. When the gas load increases, the jet pump suction pressure will rise significantly (about 1.6 times), while the exhaust pressure rises slowly (about 2%); if the gas load decreases, the jet pump suction pressure drops, the outlet pressure decline. When the pump suction pressure is constant, if the working steam pressure increases, the exhaust pressure increases, the amount of exhaust increases. The cooling water temperature will generally vary with the seasons, the pump design is generally based on the summer water temperature. If the water temperature is low, the performance of the pump at all levels before the condenser will not be affected. The pump behind the condenser will reduce the gas load of the next pump due to the low condensing effect of the water temperature, becoming steady. However, in order to make the discharge pressure of the last stage pump> 10-5 Pa, it may be uneconomical to increase the working steam consumption of the last stage of the pump, which may cause the pump system to fail to work stably when the working steam is constant.

High Speed Door Accessories

About high speed Door Accessories:

1.Driving system: High Speed Door Servo System motor and control, motor SNMA / SEJ +reducer+flang+encoder+control box

2.Other accessories: Middle aluminium bar, bottom aluminium bar, aluminium vertical track, stainless steel vertical track, brushes,round nylon strip, PVC roll, rolling steel tube complete, drum be;;s for rolling tube, side end covers, stainless steel cover, steel tubes, air bag sensor system, safety light beam, Microwave sensor 24 Gigahertz,PVC welding machine, smoke and fire sensors, PVC transparent window, magnetic loop, photocell, remote control, manual push button, sound warning alarm Led lamp traffic light

For some main accessories, here is detain introduction:

1).24G radar sensor:

Brand: Hofic

Technology: Microwave processor

Maintain time: 0.5s

Protection: IP54

Transmitting frequency: 24.125GHz

Maximum installation height: <5meter

Transmitting power density: <5mw/cm2

Power consumption: <1W(VA)

Installation angle: 0-90°(lengthways) -30-30°(crosswise)

Supply voltage: AC&DC 12V-30V

2).Photocell:

Approval CE & ISO9001

Power supply AC/DC 12-30V

Static current 25A

Action current 40mA

Mounting distance Max 10m

NO or NC contact Done by NO./NC. contact selection

Working environment temperature -42℃ to +45℃

Working environment humidity 10 to 90%RH

Appearance dimensions( controller) 123*50*32mm(L*W*H)

Appearance dimensions(Magic eye head) 19*13mm(L*D)

3). Remote control

Operating Voltage: AC220V/50HZ+-20%

Transmit power:≤100mW;Super regenerative module, strong anti-interference

Operating temperature:-30℃-+70℃

Working frequency: 433MHZ;transmitter 1527, millions of encoding chip

Accept sensitivity:≤110dB

Manipulation method: electric remote control

Configure the quantity: Wireless number; factory configuration transmitter two. Can be equipped with PT2272 digital decoder chip

Configure the function: Up, down, stop, anti-lock full-featured reproduction

4). Magnetic loop

Voltage: 12V AC/DC +-10% 24V 115V AC+-10% 230V

Power: <2VA

Continued electrical output: 7A / 250V AC

Frequency range: 20 to 200K Hz

Response time: infinity (factory setting) or adjust maintain time

Sensitivity: 0.01% to 0.1% divided into 3 levels

Protection level: IP30

Electromagnetic compatibility (EMC) Complies with EM50081-1 and EN50082-2

Detection loop inductance: the limit of 40uH to 100uH ideal value 80uH to 300uH

Operating temperature: -25 ℃ to 70 ℃

Storage temperature: -40 ℃ to 85 ℃

Relative humidity: <90% non-condensing

Temperature compensation: automatic compensation up to 50 ℃ / h

Connection type: 11 pin DIN rail socket

Dimensions: 41 * 78 * 85 mm (width * height * length)

Weight: 250 grams

5). manual push button

This exit switch button is made of ABS and has built-in indicator light make it looks more elegant and fashionbale. It can be widely used in public entrance gates, public door, home, office, hotel, etc.

Door Exit Button Push To Exit Switch Door Opener For Access Control Security

Main Feature

Fashionable appearance

Made of ABS Plastic

Easy to install and operate

Used for access control

Specification

Mechanical Life: 500,000 test

Material: Plastic

6). Limit switch encoder

Voltage: DC5V-24V

Output voltage: high voltage≥85%Vcc, low voltage≤0.5V

Maximum mechanical speed:6000rpm

Anti-vibration: 50m/s,10-200HZ,XYZeach way 2 times.

Current consumption:≤30mA

Response frequency: 0-100KHZ

Protection: waterproof,oil proof,dust prevention, IP54

The output code system: binary code

Operating life: MTBF≥30000(+25℃,2000rpm)

Rotational inertia:4.0x10-8kgm²

Maximum load:radial direction20N

Axial direction:10N

Weight: about 0.4kg

High Speed Door Accessories,High Speed Door,Electronic High Speed Door Accessories

Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfgaragedoor.com