CN110631295A - Pressure control device and pressure control method - Google Patents
Pressure control device and pressure control method Download PDFInfo
- Publication number
- CN110631295A CN110631295A CN201910900685.8A CN201910900685A CN110631295A CN 110631295 A CN110631295 A CN 110631295A CN 201910900685 A CN201910900685 A CN 201910900685A CN 110631295 A CN110631295 A CN 110631295A
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- Prior art keywords
- pressure
- return
- valve
- compressor
- pipeline
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 29
- 238000005057 refrigeration Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000021022 fresh fruits Nutrition 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a pressure control device and a pressure control method for a compressor return air pipeline, wherein the pressure control device comprises a detector, a pressurizing assembly and a controller, and the detector is a pressure sensor; the pressurizing assembly comprises a pressurizing pipe, and a pressurizing pump and a switch valve are arranged on the pressurizing pipe; a bypass valve is arranged on the air return pipeline; the pressurizing assembly also comprises a liquid storage tank of which the liquid outlet is connected with the switch valve or the pressurizing pump; the pressure control device also comprises a pressure relief flow path, and the pressure relief flow path comprises an unloading valve and a pressure relief pipeline. The detector in the pressure control device provided by the invention detects the pressure value and feeds the pressure value back to the controller, and when the pressure value is lower than a first preset value, the controller controls the pressurization assembly to be opened to return to the air return pipeline of the compressor for pressurization, so that the technical problem of too low air return pressure of the pipeline in the refrigerating unit is effectively solved; meanwhile, the oil return capacity of the unit can be improved, and the reliable lubrication of the compressor is guaranteed, so that the service life of the compressor is prolonged.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a pressure control device and a pressure control method suitable for a compressor return gas pipeline.
Background
At present, the storage mode of frozen and refrigerated products is mainly stored in a refrigeration house, and the refrigeration of the refrigeration house is mainly finished by using a special condensing unit. The cold storage is used for storing fresh fruits, vegetables and other agricultural products, so that the requirements on temperature and humidity are strict. Reliable and long-lasting operation of the refrigerating unit is therefore the most important guarantee for storing food. The installation of refrigerating unit in the very easy various problems such as because of freezer overall arrangement, pipeline installation make the return-air pressure loss of pipeline, unit return-air pressure crosses lowly and leads to the end refrigerant of breathing in too little and the unit stop operation, and the pressure of breathing in simultaneously crosses lowly and leads to lubricating oil can't return the compressor along with the gas refrigerant, and then damages the compressor.
Disclosure of Invention
The invention provides a pressure control device and a pressure control method for a compressor return air pipeline, which effectively solve the technical problem of low return air pressure of the pipeline in a refrigerating unit.
The technical scheme of the invention is as follows: a pressure control device comprising: the air return pressure detection device comprises a detector for detecting the return air pressure, a boosting assembly for increasing the return air pressure of the return air pipeline, and a controller for receiving signals of the detector and controlling the boosting assembly to work.
The detector is a pressure sensor arranged at one end of the air return pipeline close to the indoor heat exchanger.
The supercharging component comprises a supercharging pipe which is connected with the air return pipeline in parallel between the compressor and the indoor heat exchanger, the supercharging pipe is provided with a supercharging pump and a switch valve, the air return pipeline is provided with a bypass valve, and when the controller controls the switch valve and the supercharging pump to be opened according to the signal of the detector, the bypass valve is controlled to be closed.
The pressurizing assembly further comprises a liquid storage tank arranged on the pressurizing pipe, and a liquid outlet of the liquid storage tank is connected with the switch valve or the pressurizing pump.
The pressure control device further comprises a pressure relief flow path for relieving pressure of the return air pipeline.
The pressure release flow path comprises a pressure release pipeline, the liquid inlet end of the pressure release pipeline is connected with one end, close to the compressor, of the air return pipeline through a pressure release valve, and the liquid outlet end of the pressure release pipeline is connected with the liquid storage tank.
The pressure dividing valve is an unloading valve or an overflow valve, and when the pressure dividing valve is the unloading valve, the controller controls the unloading valve to work according to the signal of the detector.
And a check valve is arranged on an air return pipeline between the liquid outlet end of the pressure relief pipeline and the indoor heat exchanger.
A pressure control method of a compressor return air port adopts the pressure control device to control the pressure, and comprises the following steps: detecting the pressure of a return air port of the compressor, and starting the supercharging assembly to supercharge the return air port of the compressor when the pressure is lower than a first preset value; detecting the pressure of a return port of the compressor, and when the pressure is greater than or equal to the first preset value, opening a bypass valve and closing the supercharging assembly to enable the return pipeline to normally operate; and detecting the pressure of the return port of the compressor, and when the pressure is greater than a second preset value, opening the unloading valve, and reducing the pressure of the return port of the compressor by the pressure relief flow path.
Compared with the prior art, the invention has the advantages that: the detector in the pressure control device provided by the invention detects the pressure value and feeds the pressure value back to the controller, and when the pressure value is lower than a first preset value, the controller controls the pressurization assembly to be opened to return to the air return pipeline of the compressor for pressurization, so that the technical problem of too low air return pressure of the pipeline in the refrigerating unit is effectively solved; meanwhile, the oil return capacity of the unit can be improved, and the reliable lubrication of the compressor is guaranteed, so that the service life of the compressor is prolonged.
Drawings
FIG. 1 is a schematic structural view of a pressure control device according to the present invention;
fig. 2 is a schematic flow chart of a pressure control method of the pressure control device according to the present invention.
Detailed Description
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The invention provides a pressure control device, and the embodiment is mainly explained by a condensing unit for a refrigeration house.
As shown in fig. 1, the pressure control device of the compressor return air pipeline comprises an inner machine 1 and an outer machine 2, wherein the inner machine 1 is an evaporator, and the outer machine 2 is a compressor; the refrigerant flows from the outer machine 2 to the inner machine 1 and is provided with a gas return pipeline 21, a supercharging flow path 4 is arranged in parallel with the gas return pipeline 21, the supercharging flow path 4 comprises a supercharging pipe, and the gas return pipeline 21 and the supercharging flow path 4 are introduced into the outer machine 2 through a common section; the refrigerant flows into the inner machine 1 through the liquid outlet pipe 8 to complete the circulation.
Specifically, a gas collecting pipeline 5 is arranged on the internal machine 1, the refrigerant in the internal machine 1 flows out of the gas collecting pipeline 5 after heat exchange, a detector 51 and a one-way valve 52 are sequentially arranged on the gas collecting pipeline 5 from one side of the internal machine 1, the detector 51 is a pressure sensor, the pressure sensor is arranged at one end, close to the indoor heat exchanger (internal machine), of the gas return pipeline 21, the pressure sensor can also be arranged at one end, close to the external machine, of the gas return pipeline 21, and the pressure sensor 51 is used for detecting the pressure of the refrigerant flowing out of the internal machine 1.
The gas collecting pipeline 5 is communicated with the gas storage tank 6, one end of the pressurization pipe of the pressurization flow path 4 and one end of the gas return pipeline 21 are communicated with the gas storage tank 6, and the other end of the pressurization pipe is connected into the external unit 2.
An on-off valve 41 and a booster pump 42 are further provided in the booster flow path 4 in this order in the direction of outflow from the air tank 6, the on-off valve 41 controlling the opening and closing of the booster flow path 4, and the booster pump 42 increasing the pressure of the refrigerant flowing into the outer unit 2 after being opened.
A bypass valve 31 is further provided in the return air line 21, and the bypass valve 31 is used to control the opening or closing of the return air line 21.
Preferably, the pressure control device of the present invention is further provided with a pressure relief flow path 7, a liquid inlet end of the pressure relief pipeline is connected to one end of the gas return pipeline 21 close to the compressor (i.e., the gas return pipeline 21 and the pressurization flow path 4 are communicated to a common section of the outdoor unit 2) through a pressure relief valve, a liquid outlet end of the pressure relief pipeline is connected to the liquid storage tank 6, the pressure relief flow path 7 is communicated with the gas return pipeline 21 through a pressure relief valve 71, when a pressure of a refrigerant in the pressure control device is too high, the pressure relief flow path 7 is opened to conduct the refrigerant to the liquid storage tank 6, and the pressure of the refrigerant flowing into the outdoor unit 2 is protected.
The pressure dividing valve 71 may be an overflow valve or a pressure dividing valve, and when the pressure dividing valve 71 is an unloading valve, the controller controls the unloading valve to operate according to a signal of the detector.
The check valve 52 is arranged on the air return pipeline between the liquid outlet end of the pressure relief pipeline and the indoor heat exchanger, and prevents the refrigerant from reversely flowing back to the indoor unit 1, so that the heat exchange effect of the indoor unit 1 (evaporator) is affected.
The pressure control device further comprises a controller (not shown), the controller is respectively communicated with the detector 51, the switch valve 41 and the bypass valve 31, the detector 51 feeds back the detected pressure value of the refrigerant in the pressure control device to the controller, the controller switches the opening of the supercharging flow path 4 and the bypass flow path 3 by controlling the opening or closing of the switch valve 41 and the bypass valve 31, when the pressure value of the refrigerant is lower than a first lower preset value, the controller controls the switch valve 41 to be opened and the bypass valve 31 to be closed, at this time, the refrigerant in the internal machine 1 flows into the external machine 2 through the supercharging flow path 4, the pressure of the refrigerant is increased through the effect of the booster pump 42, and the pressure value of the refrigerant is in a normal range; when the pressure value of the refrigerant is greater than or equal to the first preset value, the pressure value of the refrigerant is in a normal range, the controller controls the bypass valve 31 to be opened and the on-off valve 41 to be closed, and at this time, the refrigerant in the inner unit 1 flows into the outer unit 2 through the bypass flow path 3.
As shown in fig. 2, the pressure control apparatus according to the present invention includes: detecting the pressure value of the refrigerant, when the pressure sensor 51 detects that the pressure of the refrigerant flowing through the gas collecting pipeline 5 is lower than a first set value, feeding a signal back to the controller, and sending a corresponding control signal by the controller to enable the switch valve 41 and the booster pump 42 to be powered on to work, enabling the bypass valve 31 to be powered off, enabling the refrigerant to flow to the booster flow path 4, and after the refrigerant is boosted by the booster pump 42, improving the pressure of the gas return pipeline 21 to some extent under the normal working state of the system;
when the pressure sensor 51 detects that the pressure of the refrigerant flowing through the gas collecting pipeline 5 is equal to or higher than a first set value (that is, the pressure value of the return gas circuit from the internal unit 1 is enough to ensure that the gas can normally return to the external unit 2), the controller controls the bypass valve 31 to be powered on and switched off, the switch valve 41 and the booster pump 42 are powered off, and the refrigerant flows to the pipe section where the bypass valve 31 is located and returns to the compressor from the bypass flow path 3 and the return gas circuit 21;
when the pressure value of the pipeline refrigerant pressurized by the pipeline pressurizing pump 42 flowing into the return air pipeline 21 exceeds the second preset value of the work of the unloading valve, the pressure dividing valve 71 is opened, and the refrigerant returns to the air storage tank 6 through the pressure relief flow path 7, so that the pressure of the refrigerant returning to the internal machine 1 (compressor) is maintained at the level of the stable range value.
Preferably, a pressure sensor may be provided at a refrigerant inlet of the outdoor unit 2 to ensure the detected inflow into the outdoor unit 2
The above specific embodiments are only intended to illustrate the inventive concept and many modifications and variations may be made by those skilled in the art within the spirit of the invention, which are included within the scope of the invention.
Claims (11)
1. A pressure control device, comprising: the air return pressure detection device comprises a detector for detecting the return air pressure, a boosting assembly for increasing the return air pressure of the return air pipeline, and a controller for receiving signals of the detector and controlling the boosting assembly to work.
2. The pressure control device of claim 1 wherein the detector is a pressure sensor disposed at an end of the return air line proximate the indoor heat exchanger.
3. The pressure control device of claim 1, wherein the boost assembly comprises a boost pipe connected in parallel with the air return pipe between the compressor and the indoor heat exchanger, the boost pipe is provided with a boost pump and a switch valve, the air return pipe is provided with a bypass valve, and the bypass valve is controlled to be closed when the switch valve and the boost pump are controlled to be opened by the controller according to the signal of the detector.
4. The pressure control device of claim 3, wherein the pressure boost assembly further comprises a liquid storage tank arranged on the pressure boost pipe, and a liquid outlet of the liquid storage tank is connected with the switch valve or the pressure boost pump.
5. The pressure control device of claim 1, further comprising a pressure relief flow path to relieve pressure to the return gas line.
6. The pressure control device of claim 5, wherein the pressure relief flow path comprises a pressure relief pipeline, a liquid inlet end of the pressure relief pipeline is connected with one end, close to the compressor, of the air return pipeline through a pressure relief valve, and a liquid outlet end of the pressure relief pipeline is connected with the liquid storage tank.
7. The pressure control device according to claim 6, wherein the partial pressure valve is an unloading valve or an overflow valve, and when the partial pressure valve is an unloading valve, the controller controls the unloading valve to operate according to a signal from the detector.
8. The pressure control device as claimed in claim 7, wherein a check valve is disposed on a gas return line between the liquid outlet end of the pressure relief line and the indoor heat exchanger.
9. A method for controlling the pressure of a return port of a compressor, which is performed by the pressure control apparatus according to claims 1 to 8, comprising the steps of:
detecting the pressure of a return air port of the compressor;
and when the pressure is lower than a first preset value, the boosting assembly is started to boost the return air port of the compressor.
10. The pressure control method according to claim 9, further comprising the step of:
detecting the pressure of a return air port of the compressor;
and when the pressure is greater than or equal to the first preset value, opening a bypass valve and closing the supercharging assembly to enable the air return pipeline to normally operate.
11. The pressure control method according to claim 9, further comprising the step of:
detecting the pressure of a return air port of the compressor;
and when the pressure is greater than a second preset value, opening the unloading valve, and reducing the pressure of the return air port of the compressor by the pressure relief flow path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910900685.8A CN110631295A (en) | 2019-09-23 | 2019-09-23 | Pressure control device and pressure control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910900685.8A CN110631295A (en) | 2019-09-23 | 2019-09-23 | Pressure control device and pressure control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110631295A true CN110631295A (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910900685.8A Pending CN110631295A (en) | 2019-09-23 | 2019-09-23 | Pressure control device and pressure control method |
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| Country | Link |
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| CN (1) | CN110631295A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776556A (en) * | 2021-08-05 | 2022-07-22 | 株式会社神户制钢所 | Compressor unit and control method of compressor unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203771836U (en) * | 2014-03-13 | 2014-08-13 | 江苏方正计量检测有限公司 | Evaporator long-time running defroster of high-and-low temperature test facility |
| CN206726063U (en) * | 2017-03-31 | 2017-12-08 | 北京金风慧能技术有限公司 | The pressure control device and cooling device of cooling device |
| JP2017223343A (en) * | 2016-06-17 | 2017-12-21 | 株式会社タダノ | Boosting device for vehicle for high-lift work |
| CN108758920A (en) * | 2018-07-03 | 2018-11-06 | 依米康科技集团股份有限公司 | A kind of air conditioner coolant flow quantity control system and its control method |
-
2019
- 2019-09-23 CN CN201910900685.8A patent/CN110631295A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203771836U (en) * | 2014-03-13 | 2014-08-13 | 江苏方正计量检测有限公司 | Evaporator long-time running defroster of high-and-low temperature test facility |
| JP2017223343A (en) * | 2016-06-17 | 2017-12-21 | 株式会社タダノ | Boosting device for vehicle for high-lift work |
| CN206726063U (en) * | 2017-03-31 | 2017-12-08 | 北京金风慧能技术有限公司 | The pressure control device and cooling device of cooling device |
| CN108758920A (en) * | 2018-07-03 | 2018-11-06 | 依米康科技集团股份有限公司 | A kind of air conditioner coolant flow quantity control system and its control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776556A (en) * | 2021-08-05 | 2022-07-22 | 株式会社神户制钢所 | Compressor unit and control method of compressor unit |
| CN114776556B (en) * | 2021-08-05 | 2022-11-18 | 株式会社神户制钢所 | Compressor unit and control method of compressor unit |
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Application publication date: 20191231 |
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| RJ01 | Rejection of invention patent application after publication |