CN207740172U - Water charging system and vacuum pump set - Google Patents
Water charging system and vacuum pump set Download PDFInfo
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- CN207740172U CN207740172U CN201721817325.4U CN201721817325U CN207740172U CN 207740172 U CN207740172 U CN 207740172U CN 201721817325 U CN201721817325 U CN 201721817325U CN 207740172 U CN207740172 U CN 207740172U
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Abstract
The utility model discloses a kind of water charging system and vacuum pump set, reach in the case where not influencing water ring pump work, saved water resource, while taking into account cost so that enterprise has more the purpose of the market competitiveness.The main technical schemes of the utility model are：A kind of water charging system and vacuum pump set, including：Water ring pump, including air intake, vapor-liquid outlet and water supplement port；Gas-liquid separator, including gas-liquid inlet port, exhaust outlet, discharge outlet and discharge opening；Lobe pump, including air inlet, gas outlet and cooling water out；Water storage box, including the first water inlet, the second water inlet, third water inlet and water outlet；The gas outlet is connected to air intake, the vapor-liquid outlet is connected to the gas-liquid inlet port, the water supplement port is connected to the water outlet, the discharge outlet is connected to first water inlet, the cooling water out is connected to second water inlet, and the third water inlet is connected to originally water loop；The originally water loop is connected to the lobe pump.
Description
Technical field
The utility model is related to field of vacuum more particularly to a kind of water charging systems and vacuum pump set.
Background technology
In industry-by-industry, it can often use roots pump systems with water ring manufacture vacuum environment to carry out operation, work well, tie
Structure is simple, the operation is stable so that its application is more and more wider.
In the prior art, when water ring pump work in vacuum pump set, the water of water ring pump can gradually decrease, if not to water ring
Pump carries out moisturizing, then can water ring pump be stopped work, therefore often external water pipe carries out fluid infusion to water ring pump.And in order to economize on
Water in gas in the gas-liquid separator in water ring pump downstream also can be supplied to water ring pump by water after separating and filtering.But gas
The operating ambient temperature of liquid/gas separator is higher so that the coolant-temperature gage in gas-liquid separator constantly rises in cycle, and water ring pump
The optimum water temperature of work passes through the heating of gas-liquid separator at 20 degrees Celsius, and the temperature of water can be higher than 20 degrees Celsius, this can make
Water ring pump work efficiency drop is obtained, while making water ring pump fragile.And cost of freezing is far above water cost, is set if increasing cooling
It is standby, then can operating cost be significantly increased, the market competitiveness is caused to decline.
Utility model content
In view of this, a kind of water charging system of the utility model embodiment offer and vacuum pump set, main purpose are in not shadow
In the case of Xiangshui County's ring pump work, water resource is saved, while taking into account cost so that enterprise has more the market competitiveness.
In order to achieve the above objectives, the utility model mainly provides the following technical solutions：
On the one hand, the utility model embodiment provides a kind of water charging system, including：
Water ring pump, including air intake, vapor-liquid outlet and water supplement port；
Gas-liquid separator, including gas-liquid inlet port, exhaust outlet, discharge outlet and discharge opening；
Lobe pump, including air inlet, gas outlet and cooling water out；
Water storage box, including the first water inlet, the second water inlet, third water inlet and water outlet；
The gas outlet is connected to air intake, and the vapor-liquid outlet is connected to the gas-liquid inlet port, the water supplement port
It is connected to the water outlet, the discharge outlet is connected to first water inlet, and the cooling water out is connected to described second
Water inlet, the third water inlet are connected to originally water loop；The originally water loop is connected to the lobe pump.
Further, between the water supplement port and the water outlet and/or the discharge outlet and first water inlet it
Between be equipped with filter.
Further, further include the first hydraulic pressure sensor；First hydraulic pressure sensor is arranged on the water ring pump, and
It is connected to the water storage box, when first hydraulic pressure sensor measures pressure less than the first preset value, the water supplement port connection
It is connected in the water outlet, the water storage box is to the water ring pump moisturizing.
Further, further include liquid level sensor, the liquid level sensor is arranged in the water storage box, and is connected to described
Cool down water out；The liquid level sensor controls the water storage box by controlling the opening and closing of the cooling water out
Liquid level.
Further, further include PLC, air bleeding valve and baroceptor, the air bleeding valve and the baroceptor are all provided with
It sets on the water storage box top；The PLC is connected to the baroceptor and the air bleeding valve, when air in the water storage box
When pressure reaches the second preset value, the PLC controls the air bleeding valve and opens so that air is discharged.
Further, further include the second hydraulic pressure sensor, second hydraulic pressure sensor is arranged on the lobe pump, and
It is connected to the PLC, the PLC is connected to first water inlet and the third water inlet；When the lobe pump measures water
When pressure is less than the third preset value of second hydraulic pressure sensor, the PLC reduces the third water inlet flow or closes institute
Third water inlet is stated, and increases the first water inlet flow.
On the other hand, the utility model embodiment also provides a kind of vacuum pump set, including：Vacuum tank and benefit as described above
Water system；The vacuum tank is connected to the air inlet.
The kind water charging system that the utility model embodiment proposes, including：Water ring pump, gas-liquid separator, lobe pump and water storage
Case；Water ring pump includes air intake, vapor-liquid outlet and water supplement port；Gas-liquid separator includes gas-liquid inlet port, exhaust outlet, discharge outlet
And discharge opening；Lobe pump includes air inlet, gas outlet and cooling water out；Water storage box include the first water inlet, the second water inlet,
Third water inlet and water outlet；Gas outlet is connected to air intake, and vapor-liquid outlet is connected to gas-liquid inlet port, and water supplement port is connected to
Water outlet, discharge outlet are connected to the first water inlet, and cooling water out is connected to the second water inlet, and third water inlet is connected to originally
Water loop；Originally water loop is connected to lobe pump.The utility model using lobe pump temperature lowering water and circuit in it is extra originally
Water carries out moisturizing, effectively reduces the usage amount of water in gas-liquid separator, while having also achieved and achieving the effect that recycling, effectively
Save water resource.And in order to reduce the temperature of lobe pump, the temperature of temperature lowering water is relatively low so that temperature lowering water absorbs the heat of lobe pump
Afterwards, temperature is still below 20 degrees Celsius, and after the transmission through piping, temperature is gradually drawn close to room temperature so that the work of water ring pump
20 best degrees centigrades are maintained at as temperature, this has not only reached the effect for saving water resource, and originally in water loop
Water is used because that need to supply lobe pump, and pressure and water are larger so that in addition to supplying lobe pump use, also has remaining water in turn
Recycling supply water ring pump, and the water impurity content of lobe pump and originally water loop is less, enables to the service life of water ring pump
Extend, has also taken into account production and maintenance cost.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram for water charging system that the utility model embodiment provides.
Specific implementation mode
Further to illustrate that the utility model is to reach the technological means and effect that predetermined purpose of utility model is taken,
Below in conjunction with attached drawing and preferred embodiment, to according to the utility model proposes water charging system specific implementation mode, structure, feature
And its effect, it is described in detail as after.
As shown in Figure 1, a kind of water charging system, including：
Water ring pump 1, including air intake 11, vapor-liquid outlet 12 and water supplement port 13；
Gas-liquid separator 2, including gas-liquid inlet port 21, exhaust outlet 22, discharge outlet 23 and discharge opening 24；It is actually using
In, since above-mentioned originally water loop is preferentially to ensure the high service of above-mentioned lobe pump 3, lead to the water supply of above-mentioned originally water loop
Amount is insufficient, and the temperature lowering water water supply of above-mentioned lobe pump 3 is stablized, and total amount still slightly lacks, to ensure the water of above-mentioned water ring pump
Amount supply is normal, though the coolant-temperature gage of above-mentioned gas-liquid separator 2 can be gradually increasing, but because in the entrance of above-mentioned gas-liquid separator 2
The amount for stating water storage box 4 is smaller, therefore is still able to normal use.
Lobe pump 3, including air inlet 31, gas outlet 32 and cooling water out 33；In actual use, above-mentioned lobe pump 3
Quantity be it is multiple, then multiple above-mentioned lobe pumps 3 are all connected to above-mentioned water storage box 4, can more be supplied water in this way, to
It reduces and even stops the water supply of above-mentioned gas-liquid separator 2 and above-mentioned originally water loop to above-mentioned water tank 4.
Water storage box 4, including the first water inlet 41, the second water inlet 42, third water inlet 43 and water outlet 44；Using above-mentioned
Water storage box 4 can put aside the temperature lowering water after heat absorption, and the cooling coolant-temperature gage after heat absorption is made to gradually rise up to 20 degrees Celsius of room temperature,
Ensure the optimum working temperature of above-mentioned water ring pump 1 so that safety is more stablized in the work of above-mentioned water ring pump 1.Above-mentioned water storage simultaneously
Case 4 can mix the water of above-mentioned gas-liquid separator 2, above-mentioned lobe pump 3 and above-mentioned originally water loop, to carry out heat exchange, protect
Demonstrate,prove the stabilization of water temperature in above-mentioned water storage box.
Above-mentioned gas outlet 32 is connected to air intake 11, and above-mentioned vapor-liquid outlet 12 is connected to above-mentioned gas-liquid inlet port 21, on
It states water supplement port 13 and is connected to above-mentioned water outlet 44, above-mentioned discharge outlet 23 is connected to above-mentioned first water inlet 41, and above-mentioned temperature lowering water goes out
Mouth 33 is connected to above-mentioned second water inlet 42, and above-mentioned third water inlet 43 is connected to originally water loop；Above-mentioned originally water loop connects
It is connected to above-mentioned lobe pump 3.
The moisturizing system in the present embodiment is illustrated below by way of the working process and principle of water charging system in the present embodiment
System：
Gas liquid mixture enters above-mentioned lobe pump 3 from above-mentioned air inlet 31, and above-mentioned air intake is inputted from above-mentioned gas outlet 32
11 enter above-mentioned water ring pump 1, and inputting above-mentioned gas-liquid inlet port 21 from above-mentioned vapor-liquid outlet 12 enters above-mentioned gas-liquid separator 2,
So that gas, by 22 direct emission of above-mentioned exhaust outlet, the water of separation is most of to flow out from above-mentioned discharge opening 24, small part water from
Above-mentioned discharge outlet 23 enters above-mentioned water storage box.The temperature lowering water of above-mentioned lobe pump 3 carries out cooling absorption heat to above-mentioned lobe pump 3
Afterwards, above-mentioned water storage box 4 is flowed into from above-mentioned cooling water out 33.Above-mentioned originally water loop is using it to the water supply of above-mentioned lobe pump 3
It is remaining, above-mentioned water storage box 3 is supplemented, the water in above-mentioned water storage box 3 flows into above-mentioned water supplement port 13 from above-mentioned water outlet 44, to upper
The water ring for stating water ring pump 1 carries out moisturizing.
The kind water charging system that the utility model embodiment proposes, including：Water ring pump, gas-liquid separator, lobe pump and water storage
Case；Water ring pump includes air intake, vapor-liquid outlet and water supplement port；Gas-liquid separator includes gas-liquid inlet port, exhaust outlet, discharge outlet
And discharge opening；Lobe pump includes air inlet, gas outlet and cooling water out；Water storage box include the first water inlet, the second water inlet,
Third water inlet and water outlet；Gas outlet is connected to air intake, and vapor-liquid outlet is connected to gas-liquid inlet port, and water supplement port is connected to
Water outlet, discharge outlet are connected to the first water inlet, and cooling water out is connected to the second water inlet, and third water inlet is connected to originally
Water loop；Originally water loop is connected to lobe pump.The utility model using lobe pump temperature lowering water and circuit in it is extra originally
Water carries out moisturizing, effectively reduces the usage amount of water in gas-liquid separator, while having also achieved and achieving the effect that recycling, effectively
Save water resource.And in order to reduce the temperature of lobe pump, the temperature of temperature lowering water is relatively low so that temperature lowering water absorbs the heat of lobe pump
Afterwards, temperature is still below 20 degrees Celsius, and after the transmission through piping, temperature is gradually drawn close to room temperature so that the work of water ring pump
20 best degrees centigrades are maintained at as temperature, this has not only reached the effect for saving water resource, and originally in water loop
Water is used because that need to supply lobe pump, and pressure and water are larger so that in addition to supplying lobe pump use, also has remaining water in turn
Recycling supply water ring pump, and the water impurity content of lobe pump and originally water loop is less, enables to the service life of water ring pump
Extend, has also taken into account production and maintenance cost.
The utility model is described in further detail with reference to the accompanying drawings and examples.
In order to extend the service life of above-mentioned water ring pump 1, specifically, between above-mentioned water supplement port 13 and above-mentioned water outlet 44
And/or filter 5 is equipped between above-mentioned discharge outlet 23 and above-mentioned first water inlet 41.Due to the water in above-mentioned gas-liquid separator 2
Impurity content is very high, if being sent directly into above-mentioned water ring pump 1, impurity can recycle in above-mentioned water ring pump 1 to rub in above-mentioned water ring pump 1
Portion so that above-mentioned water ring pump 1 is worn and causes to damage, and this abrasion is unrepairable, and can drastically shorten above-mentioned
The service life of water ring pump 1 so that maintenance cost increases, and also results in the loss of time of maintenance shut-downs.It is upper to prevent impurity from entering
Stating water ring pump 1 causes above-mentioned water ring pump 1 to wear, and using above-mentioned filter 5, and the position of above-mentioned filter 5 and quantity are according to tool
Body demand, can be between above-mentioned water supplement port 13 and above-mentioned water outlet 44 and/or above-mentioned discharge outlet 23 and above-mentioned first water inlet
Selection setting is carried out between 41.
For the ease of observing water in above-mentioned water ring pump 1, while water can be replenished in time, specifically, further including the first water
Pressure sensor；Above-mentioned first hydraulic pressure sensor is arranged on above-mentioned water ring pump 1, and is connected to above-mentioned water storage box 4, when above-mentioned first
When hydraulic pressure sensor measures pressure less than the first preset value, above-mentioned water supplement port 13 is connected to the connection of above-mentioned water outlet 44, above-mentioned storage
Water tank 4 is to 1 moisturizing of above-mentioned water ring pump.Due to 1 shell of above-mentioned water ring pump and nontransparent, water ring water can not be observed, it is difficult to ensure that
The supplementary water time and rate of water make-up of water ring, and the hydraulic pressure of above-mentioned water ring pump 1 can be monitored in real time using above-mentioned hydraulic pressure sensor, to
Determine that supplementary water time, such water supplementing method more much sooner, not will produce above-mentioned water ring pump 1 caused by moisturizing hysteresis
Power, which declines, even stops work, while making moisturizing work more intelligent, reduces cost of labor.
Since the water-holding capacity of above-mentioned water storage box 4 is limited, while after supplying water to above-mentioned water ring pump 1 needing that storage is replenished in time
Water, specifically, further including liquid level sensor, above-mentioned liquid level sensor is arranged in above-mentioned water storage box 4, and is connected to above-mentioned temperature lowering water
Outlet 33；Above-mentioned liquid level sensor controls above-mentioned water storage box 4 by controlling the opening and closing of above-mentioned cooling water out 33
Liquid level.In temperature lowering water to above-mentioned water ring pump 1 for seasonable, the liquid level of the temperature lowering water in above-mentioned water storage box 4 declines, and needs in time to above-mentioned
Water storage box 4 supplements temperature lowering water so that temperature lowering water can be gradually heating to room twice to the time supplied between above-mentioned water ring pump 1
20 degrees Celsius of temperature.Above-mentioned liquid level sensor can monitor the liquid level of the temperature lowering water in above-mentioned water storage box 4 in real time, can detect in time
Decline to the temperature lowering water liquid level in above-mentioned water storage box 4 so that temperature lowering water is replenished in time in above-mentioned water storage box 4 so that in above-mentioned water ring
When pump 1 needs moisturizing, the temperature lowering water for being close to or up to room temperature can be supplied in time.Without direct surveillance, when reducing response delay
Between, while cost of labor is greatly decreased.
Since temperature lowering water is in transportational process, it might have air and incorporate in water, for the ease of discharging air, specifically,
Further include PLC, air bleeding valve 6 and baroceptor, above-mentioned air bleeding valve 6 and above-mentioned baroceptor are arranged at above-mentioned water storage box 4
Top；Above-mentioned PLC is connected to above-mentioned baroceptor and above-mentioned air bleeding valve 6, when 4 inner air pressure of above-mentioned water storage box reaches second
When preset value, above-mentioned PLC controls above-mentioned air bleeding valve 6 and opens so that air is discharged.Temperature lowering water can dissolve free in transportational process
Gas, but standing heating in above-mentioned water storage box 4 can then be such that the air in water is precipitated, and the air being precipitated can then accumulate in above-mentioned storage
In water tank 4, influences above-mentioned water storage box 4 and put aside temperature lowering water, therefore can be measured in above-mentioned water storage box 4 using above-mentioned baroceptor
Air pressure, when the air pressure in above-mentioned water storage box 4 reaches above-mentioned second preset value, above-mentioned PLC controls above-mentioned air bleeding valve 6
Open so that air is discharged so that above-mentioned water storage box 4 can continuous work, while being vented without hand inspection, segmentum intercalaris when saving
About human cost.
Water due to above-mentioned originally water loop is mainly for answering above-mentioned lobe pump 3 to use, to ensure to supply to above-mentioned water storage box 4
When water, the hydraulic pressure of above-mentioned lobe pump 3, specifically, further including the second hydraulic pressure sensor, above-mentioned second hydraulic pressure sensor is arranged upper
It states on lobe pump 3, and is connected to above-mentioned PLC, above-mentioned PLC is connected to above-mentioned first water inlet 41 and above-mentioned third water inlet 43；
When above-mentioned lobe pump 3, which measures hydraulic pressure, is less than the third preset value of above-mentioned second hydraulic pressure sensor, above-mentioned PLC reduces above-mentioned third
43 flow of water inlet closes above-mentioned third water inlet 43, and increases above-mentioned first water inlet, 41 flow.Above-mentioned second hydraulic pressure passes
Sensor can monitor the hydraulic pressure of above-mentioned lobe pump 3 in real time, when the hydraulic pressure deficiency of above-mentioned lobe pump 3, even if above-mentioned PLC reduces very
Water supply to the above-mentioned originally water loop of closing to above-mentioned water storage box 4, and in order to ensure the water supply of above-mentioned water ring pump 1, in above-mentioned sieve
In the case that thatch 3 temperature lowering water waters of pump are certain, need to increase water supply of the above-mentioned gas-liquid separator 2 to above-mentioned water storage box 4, to protect
Demonstrate,prove the normal work of above-mentioned lobe pump 3 and above-mentioned water ring pump 1.
The utility model also provides a kind of vacuum pump set, including：Vacuum tank and water charging system as described above；Above-mentioned vacuum
Tank is connected to above-mentioned air inlet 31.Above-mentioned water charging system is connected to a set of above-mentioned vacuum pump set of above-mentioned vacuum tank composition can be straight
It connects to put into production sale and put into existing equipment and be used.
A kind of vacuum pump set that the utility model embodiment proposes, including：Vacuum tank and water charging system as described above；On
It states vacuum tank and is connected to above-mentioned air inlet.Wherein water charging system includes：Water ring pump, gas-liquid separator, lobe pump and water storage box；Water
Ring pump includes air intake, vapor-liquid outlet and water supplement port；Gas-liquid separator includes gas-liquid inlet port, exhaust outlet, discharge outlet and lets out
The mouth of a river；Lobe pump includes air inlet, gas outlet and cooling water out；Water storage box includes the first water inlet, the second water inlet, third
Water inlet and water outlet；Gas outlet is connected to air intake, and vapor-liquid outlet is connected to gas-liquid inlet port, and water supplement port is connected to water outlet
Mouthful, discharge outlet is connected to the first water inlet, and cooling water out is connected to the second water inlet, and third water inlet is connected to tap water and returns
Road；Originally water loop is connected to lobe pump.The utility model using extra tap water in the temperature lowering water of lobe pump and circuit into
Row moisturizing, effectively reduces the usage amount of water in gas-liquid separator, while having also achieved and achieving the effect that recycling, effectively save
Water resource.And in order to reduce the temperature of lobe pump, the temperature of temperature lowering water is relatively low so that after temperature lowering water absorbs the heat of lobe pump,
Temperature is still below 20 degrees Celsius, and after the transmission through piping, temperature is gradually drawn close to room temperature so that the work temperature of water ring pump
Degree be maintained at 20 best degrees centigrades, this do not only reached save water resource effect, and originally the water in water loop because
Lobe pump use need to be supplied, pressure and water are larger so that in addition to supplying lobe pump use, also there is remaining water and then recycle
Water ring pump is supplied, and the water impurity content of lobe pump and originally water loop is less, and the service life of water ring pump is enabled to extend,
Production and maintenance cost are also taken into account.
Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain that profit requires.
Claims (7)
1. a kind of water charging system, which is characterized in that including：
Water ring pump, including air intake, vapor-liquid outlet and water supplement port；
Gas-liquid separator, including gas-liquid inlet port, exhaust outlet, discharge outlet and discharge opening；
Lobe pump, including air inlet, gas outlet and cooling water out；
Water storage box, including the first water inlet, the second water inlet, third water inlet and water outlet；
The gas outlet is connected to air intake, and the vapor-liquid outlet is connected to the gas-liquid inlet port, the water supplement port connection
In the water outlet, the discharge outlet is connected to first water inlet, and the cooling water out is connected to described second and enters water
Mouthful, the third water inlet is connected to originally water loop；The originally water loop is connected to the lobe pump.
2. water charging system according to claim 1, which is characterized in that between the water supplement port and the water outlet and/or
Filter is equipped between the discharge outlet and first water inlet.
3. water charging system according to claim 2, which is characterized in that further include the first hydraulic pressure sensor；First water
Pressure sensor is arranged on the water ring pump, and is connected to the water storage box, when to measure pressure small for first hydraulic pressure sensor
When the first preset value, the water supplement port is connected to water outlet connection, and the water storage box is to the water ring pump moisturizing.
4. water charging system according to claim 3, which is characterized in that further include liquid level sensor, the liquid level sensor
It is arranged in the water storage box, and is connected to the cooling water out；The liquid level sensor is by controlling the cooling water out
Opening and closing control the liquid level of the water storage box.
5. water charging system according to claim 4, which is characterized in that further include PLC, air bleeding valve and baroceptor, institute
It states air bleeding valve and the baroceptor is arranged at the water storage box top；The PLC be connected to the baroceptor and
The air bleeding valve, when the water storage box inner air pressure reaches the second preset value, the PLC controls the air bleeding valve and opens,
So that air discharge.
6. water charging system according to claim 5, which is characterized in that further include the second hydraulic pressure sensor, second water
Pressure sensor is arranged on the lobe pump, and is connected to the PLC, and the PLC is connected to first water inlet and described
Third water inlet；When the lobe pump, which measures hydraulic pressure, is less than the third preset value of second hydraulic pressure sensor, the PLC subtracts
The small third water inlet flow closes the third water inlet, and increases the first water inlet flow.
7. a kind of vacuum pump set, which is characterized in that including：Vacuum tank and the moisturizing system as described in any one of claim 1-6
System；The vacuum tank is connected to the air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721817325.4U CN207740172U (en) | 2017-12-22 | 2017-12-22 | Water charging system and vacuum pump set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721817325.4U CN207740172U (en) | 2017-12-22 | 2017-12-22 | Water charging system and vacuum pump set |
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| Publication Number | Publication Date |
|---|---|
| CN207740172U true CN207740172U (en) | 2018-08-17 |
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ID=63119362
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721817325.4U Active CN207740172U (en) | 2017-12-22 | 2017-12-22 | Water charging system and vacuum pump set |
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| Country | Link |
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| CN (1) | CN207740172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594441A (en) * | 2020-05-21 | 2020-08-28 | 上海工程技术大学 | Small-volume water-saving water ring pump device |
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2017
- 2017-12-22 CN CN201721817325.4U patent/CN207740172U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594441A (en) * | 2020-05-21 | 2020-08-28 | 上海工程技术大学 | Small-volume water-saving water ring pump device |
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