CN214620159U - Multi-stage refrigerating unit - Google Patents
Multi-stage refrigerating unit Download PDFInfo
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- CN214620159U CN214620159U CN202120894594.0U CN202120894594U CN214620159U CN 214620159 U CN214620159 U CN 214620159U CN 202120894594 U CN202120894594 U CN 202120894594U CN 214620159 U CN214620159 U CN 214620159U
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Abstract
The utility model provides a multistage refrigerating unit. The outlet of the gas-liquid separator is divided into two paths through a first tee joint, one path is connected to a second tee joint through a first one-way valve, the other path is connected to the air suction port of the low-pressure compressor through a first return oil separator, and the exhaust port of the low-pressure compressor is connected to the second tee joint through a pipeline; the pipeline is divided into two paths after passing through a second tee joint, one path is connected to the inlet of the condenser through a second one-way valve, the other path is connected to the air suction port of the high-pressure compressor through a second return air oil separator, and the exhaust port of the high-pressure compressor is connected to the inlet of the condenser through the pipeline; the outlet of the condenser is divided into two paths by a pipeline, one path is connected to the inlet of the evaporator by a heat exchanger and a main expansion valve, and the other path is connected to a second three-way pipeline by an electromagnetic valve, an auxiliary expansion valve and the heat exchanger; the outlet of the evaporator is connected to the inlet of the gas-liquid separator through a pipeline to form a circulating loop. The heat pump unit is suitable for being used as a low-temperature refrigerating unit, a high-temperature hot water unit, a high-temperature steam heat pump unit and a heat pump drying unit.
Description
Technical Field
The utility model relates to an energy field's low temperature refrigerating unit, high temperature heat pump set especially relate to multistage refrigerating unit, high temperature hot water unit.
Background
At present, with the development and progress of society, heat pump units utilizing low-grade heat energy and low-temperature refrigerating units are widely applied. When the temperature difference is large, the problem needs to be solved by two-stage compression or even multi-stage compression. The direct connection efficiency of the low-pressure compressor exhaust and the high-pressure compressor suction is the highest, but under the working condition that the compression ratio is very low, when the displacement of the low-pressure compressor is greater than the suction capacity of the high-pressure compressor, the exhaust pressure of the low-pressure compressor is increased, and the high-pressure compressor runs passively, so that the heat efficiency of a unit is influenced, a surge effect is generated, and the stability of the unit is influenced.
The notice numbers CN203501524U and CN208794775U of the double-unit overlapping type low-temperature air source heat pump unit effectively solve the problem of a double-stage system, but the heat exchanger is added, so that the heat efficiency of the double-stage operation is affected, and the structure is complex, so that the production cost is greatly improved, and the popularization is difficult.
"a doublestage low temperature air source heat pump set with refrigeration function" bulletin no: 208091008U can realize free conversion between single stage and double stage, and can greatly improve the thermal efficiency of the machine set, but because under the condition that the low pressure compressor 1 works and the high pressure compressor 2 does not work, a small part of the exhaust gas of the low pressure stage compressor flows through the high pressure stage compressor, and the exhaust gas of the low pressure compressor contains a certain amount of lubricating oil, so that a part of the lubricating oil enters the high pressure compressor and is deposited in the high pressure compressor, and thus, the long-time continuous single-machine operation of the low pressure compressor can cause a large amount of lubricating oil to be deposited in the high pressure compressor, which causes the conditions that the high pressure compressor can not be started and the low pressure compressor is lack of oil, and is not suitable for the long-time continuous operation of the single compressor.
Disclosure of Invention
In order to improve the thermal efficiency of refrigerator, solve the exhaust of low pressure compressor and the oil return problem that the high pressure compressor breathes in the lug connection production, the utility model provides a multistage refrigerating unit. According to the multistage refrigerating unit, the vertical return oil separator is additionally arranged on the air suction port of the compressor, so that the technical problem of oil return of the compressor is solved.
The utility model provides a scheme that technical problem adopted is:
the multistage refrigerating unit comprises a low-pressure compressor, a high-pressure compressor, a gas-liquid separator, an evaporator, a main expansion valve, an auxiliary expansion valve, a condenser, a first return gas-oil separator, a second return gas-oil separator, a first check valve, a second check valve, a first tee joint, a second tee joint, an electromagnetic valve and a heat exchanger; the outlet of the gas-liquid separator is divided into two paths through a first tee joint, one path is connected to a second tee joint through a first one-way valve, the other path is connected to the air suction port of the low-pressure compressor through a first return oil separator, and the exhaust port of the low-pressure compressor is connected to the second tee joint through a pipeline; the pipeline is divided into two paths after passing through a second tee joint, one path is connected to the inlet of the condenser through a second one-way valve, the other path is connected to the air suction port of the high-pressure compressor through a second return air oil separator, and the exhaust port of the high-pressure compressor is connected to the inlet of the condenser through the pipeline; the outlet of the condenser is divided into two paths by a pipeline, one path is connected to the inlet of the evaporator by a heat exchanger and a main expansion valve, and the other path is connected to a second three-way pipeline by an electromagnetic valve, an auxiliary expansion valve and the heat exchanger; the outlet of the evaporator is connected to the inlet of the gas-liquid separator through a pipeline to form a circulating loop.
In order to further solve the technical problem to be solved by the present invention, in the low-pressure compressor provided by the present invention, the air suction port of the low-pressure compressor is connected to the first gas-oil separator and the first tee joint, and the refrigerant oil contained in the refrigerant is separated in the first gas-oil separator and flows to the bottom of the first tee joint along the tube wall, so as to prevent the oil in the refrigerant from depositing in the low-pressure compressor.
Furthermore, the air suction port of the high-pressure compressor is connected with a second return oil separator and a second tee joint, and the refrigerating machine oil contained in the refrigerant can be separated in the second return oil separator and flows to the bottom of the second tee joint along the wall of the pipe, so that the oil in the refrigerant is prevented from being deposited in the high-pressure compressor.
Positive effect, because the utility model discloses an exhaust and the high-pressure compressor of low pressure compressor have been solved at the compressor return air port and have breathed in lug connection's oil return problem additional to realize low pressure compressor and the arbitrary unit operation of high-pressure compressor, and the duplex moves simultaneously. When the compression ratio is lower, any compressor can be started to work according to the requirement of the system on the refrigerating capacity of the unit. When the compression ratio is increased to a certain set value, the other compressor is automatically started to realize double-stage operation, so that the refrigerating capacity and the heat efficiency of the unit are greatly improved. By detecting the continuous operation of one compressor for 500 hours, there was no change in the oil level of the non-operated compressor. The heat pump unit is suitable for being used as a low-temperature refrigerating unit, a high-temperature hot water unit, a high-temperature steam heat pump unit and a heat pump drying unit.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1.1. a low-pressure compressor, 1.2. a high-pressure compressor, 2. a gas-liquid separator, 3. an evaporator, 4.1. a main expansion valve, 4.2. an auxiliary expansion valve, 5. a condenser, 6.1. a first return gas-oil separator, 6.2. a second return gas-oil separator, 7.1. a first one-way valve, 7.2. a second one-way valve, 8.1. a first tee joint, 8.2. a second tee joint, 9. an electromagnetic valve and 10. a heat exchanger.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in the figure, the multistage refrigerating unit comprises a low-pressure compressor 1.1, a high-pressure compressor 1.2, a gas-liquid separator 2, an evaporator 3, a main expansion valve 4.1, an auxiliary expansion valve 4.2, a condenser 5, a first return gas-oil separator 6.1, a second return gas-oil separator 6.2, a first one-way valve 7.1, a second one-way valve 7.2, a first tee joint 8.1, a second tee joint 8.2, an electromagnetic valve 9 and a heat exchanger 10; the outlet of the gas-liquid separator 2 is divided into two paths through a first tee joint 8.1, one path is connected to a second tee joint 8.2 through a first one-way valve 7.1, the other path is connected to the air suction port of a low-pressure compressor 1.1 through a first return oil separator 6.1, and the exhaust port of the low-pressure compressor 1.1 is connected to the second tee joint 8.2 through a pipeline; the pipeline is divided into two paths after passing through a second tee joint 8.2, one path is connected to the inlet of the condenser 5 through a second one-way valve 7.2, the other path is connected to the air suction port of the high-pressure compressor 1.2 through a second return air oil separator 6.2, and the exhaust port of the high-pressure compressor 1.2 is connected to the inlet of the condenser 5 through the pipeline; the outlet of the condenser 5 is divided into two paths by pipelines, one path is connected to the inlet of the evaporator 3 by a heat exchanger 10 and a main expansion valve 4.1, and the other path is connected to a second three-way 8.2 pipeline by a solenoid valve 9, an auxiliary expansion valve 4.2 and the heat exchanger 10; the outlet of the evaporator 3 is connected to the inlet of the gas-liquid separator 2 through a pipeline to form a circulation loop.
In order to optimize the utility model discloses a structure, low pressure compressor 1.1 induction port is connected with first return oil separator 6.1 and first tee bend 8.1, and the refrigerating machine oil that contains in the refrigerant can be separated out in first return oil separator 6.1 to flow to first tee bend 8.1 bottom along the pipe wall, in order to avoid the oil deposit in the refrigerant to low pressure compressor 1.1.
In order to optimize the utility model discloses the stability of structure more, high-pressure compressor 1.2 induction port is connected with second return-air oil separator 6.2 and second tee bend 8.2, and the refrigerating machine oil that contains in the refrigerant can be separated out in second return-air oil separator 6.2 to flow to second tee bend 8.2 bottom along the wall of pipe, in order to avoid the oil deposit in the refrigerant to high-pressure compressor 1.2.
Example (b):
by detecting the continuous operation of one compressor for 500 hours, there was no change in the oil level of the non-operated compressor.
The utility model discloses a working process:
the operation mode is as follows:
when the compression ratio is lower than the set value, the operation mode of the low-pressure compressor is adopted:
the low-pressure compressor 1.1 absorbs the low-temperature low-pressure gaseous refrigerant which is sent to the gas-liquid separator 2 through the first tee joint 8.1 and the first gas-return oil separator 6.1 through the pipeline, the high-temperature high-pressure gaseous refrigerant is discharged after being compressed by the low-pressure compressor 1.1, the high-temperature high-pressure gaseous refrigerant discharged by the low-pressure compressor 1.1 enters the condenser 5 through the second tee joint 8.2 and the second one-way valve 7.2, meanwhile, a small part of the refrigerant flows through the second tee joint 8.2, the second gas-return oil separator 6.2 and the high-pressure compressor 1.2, the refrigerant contains a certain amount of refrigerant oil, but because the flow rate is small and the flow speed is slow, the refrigerant oil contained in the refrigerant can be separated in the second gas-return oil separator 6.2 and flows to the bottom of the second tee joint along the wall to prevent the oil in the high-pressure compressor 1.2 from depositing, the refrigerant oil at the bottom of the second tee joint 8.2 can be brought into the high-temperature high-pressure gaseous refrigerant condenser 5 discharged by the low-pressure compressor 1.1, the refrigerant and the refrigerant are circulated together, the high-temperature high-pressure gaseous refrigerant entering the condenser 5 releases heat to become high-pressure liquid refrigerant, the high-pressure liquid refrigerant passes through a pipeline, enters the main expansion valve 4.1 through the outlet of the condenser 5 and the heat exchanger 10 to be decompressed, the low-pressure refrigerant decompressed by the main expansion valve 4.1 enters the evaporator 3 through the pipeline, the refrigerant is thermally absorbed and evaporated in the evaporator 3 to become low-temperature low-pressure gaseous refrigerant, the gaseous refrigerant is discharged from the outlet of the evaporator 3 to enter the gas-liquid separator 2, redundant liquid refrigerant is separated in the gas-liquid separator 2, and the gaseous refrigerant passes through the outlet of the gas-liquid separator 2 and enters the air suction port of the low-pressure compressor 1.1 through the connecting pipe, the first tee joint 8.1 and the first gas-oil separator 6.1.
When the compression ratio is lower than the set value, the operation mode of the high-pressure compressor is adopted:
the high-pressure compressor 1.2 absorbs low-temperature and low-pressure gaseous refrigerants passing through the second return gas-oil separator 6.2, the second tee joint 8.2, the first check valve 7.1 and the first tee joint 8.1 from the gas-liquid separator 2 through pipelines and compresses the low-temperature and low-pressure gaseous refrigerants to form high-temperature and high-pressure gaseous refrigerants, the high-temperature and high-pressure gaseous refrigerants enter the condenser 5, the high-temperature and high-pressure gaseous refrigerants release heat in the condenser 5 to become high-pressure liquid refrigerants, the high-pressure liquid refrigerants pass through the pipelines and enter the main expansion valve 4.1 through the heat exchanger 10 to be decompressed, the decompressed refrigerants enter the evaporator 3, the heat in the evaporator 3 is absorbed and converted into low-temperature and low-pressure gaseous refrigerants, the low-temperature and low-pressure gaseous refrigerants enter the gas-liquid separator 2 through the pipelines, and redundant liquid refrigerants are separated in the gas-liquid separator 2 and discharged through an outlet. A small part of the low-temperature and low-pressure gaseous refrigerant discharged from the outlet of the gas-liquid separator 2 enters the high-pressure compressor 1.2 through the first tee joint 8.1, the first gas-oil return separator 6.1, the low-pressure compressor 1.1, the second tee joint 8.2 and the second gas-oil return separator 6.2; the refrigerating machine oil contained in the refrigerant is separated in the first return oil separator 6.1 and flows to the bottom of the first tee joint 8.1 along the wall of the pipe, so that the refrigerating machine oil is prevented from being deposited in the low-pressure compressor 1.1; most of the low-temperature and low-pressure gaseous refrigerant discharged by the gas-liquid separator 2 enters the air suction port of the high-pressure compressor 1.2 through the first tee joint 8.1, the first one-way valve 7.1, the second tee joint 8.2 and the second return oil separator 6.2, and brings the refrigerating machine oil flowing to the bottom of the first tee joint 8.1 into the high-pressure compressor 1.2.
When the compression ratio reaches a certain value, the system operates in two stages:
the low pressure compressor 1.1 absorbs the gaseous refrigerant which is fed to the evaporator 5 through the gas-liquid separator 2, the first tee joint 8.1 and the first gas-return oil separator 6.2 through the pipeline, the medium temperature and medium pressure gaseous refrigerant is compressed and discharged through the low pressure compressor 1.1, the medium temperature and medium pressure gaseous refrigerant passes through the pipeline and enters the air suction port of the high pressure compressor 1.2 through the second tee joint 8.2 and the second gas-return oil separator 6.2, the high pressure compressor 1.2 compresses the medium pressure gaseous refrigerant which enters, the high temperature and high pressure gaseous refrigerant is discharged, the high temperature and high pressure gaseous refrigerant enters the condenser 5, the heat is released in the condenser 5 and is converted into high-pressure liquid refrigerant, most of the high-pressure liquid refrigerant enters the heat exchanger 10 through a pipeline for precooling, the precooled liquid refrigerant enters the main expansion valve 4.1, is decompressed by the main expansion valve 4.1 and then enters the evaporator 3, the heat is absorbed in the evaporator 3 and converted into low-temperature and low-pressure gaseous refrigerant, and the low-temperature and low-pressure gaseous refrigerant is discharged from an outlet of the evaporator 3 and enters an inlet of the gas-liquid separator 2. Is discharged from an outlet of the gas-liquid separator 2, enters an air suction port of the low-pressure compressor 1.1 through a first tee joint 8.1 and the first gas-return oil separator 6.1 by a pipeline, and is compressed and discharged by the low-pressure compressor 1.1 to form a medium-temperature medium-pressure gaseous refrigerant. The other part of the liquid refrigerant discharged from the condenser 5 passes through a pipeline, enters the auxiliary expansion valve 4.2 through the electromagnetic valve 9, is decompressed by the auxiliary expansion valve 4.2, enters the heat exchanger 10 to exchange heat with the refrigerant flowing to the main expansion valve 4.1, the liquid refrigerant is converted into a gaseous refrigerant, is mixed with the medium-temperature and medium-pressure gaseous refrigerant discharged from the low-pressure compressor 1.1 through the pipeline, is converted into a medium-pressure gaseous refrigerant, and enters the air suction port of the high-pressure compressor 1.2 through the second tee joint 8.2 and the second return air oil separator 6.2 through the pipeline.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (3)
1. Multistage refrigerating unit, characterized by: the system comprises a low-pressure compressor (1.1), a high-pressure compressor (1.2), a gas-liquid separator (2), an evaporator (3), a main expansion valve (4.1), an auxiliary expansion valve (4.2), a condenser (5), a first return gas-oil separator (6.1), a second return gas-oil separator (6.2), a first one-way valve (7.1), a second one-way valve (7.2), a first tee joint (8.1), a second tee joint (8.2), an electromagnetic valve (9) and a heat exchanger (10); the outlet of the gas-liquid separator (2) is divided into two paths through a first tee joint (8.1), one path is connected to a second tee joint (8.2) through a first one-way valve (7.1), the other path is connected to the air suction port of the low-pressure compressor (1.1) through a first gas-oil return separator (6.1), and the exhaust port of the low-pressure compressor (1.1) is connected to the second tee joint (8.2) through a pipeline; the pipeline is divided into two paths after passing through a second tee joint (8.2), one path is connected to the inlet of the condenser (5) through a second one-way valve (7.2), the other path is connected to the air suction port of the high-pressure compressor (1.2) through a second return air oil separator (6.2), and the exhaust port of the high-pressure compressor (1.2) is connected to the inlet of the condenser (5) through the pipeline; the outlet of the condenser (5) is divided into two paths by a pipeline, one path is connected to the inlet of the evaporator (3) by a heat exchanger (10) and a main expansion valve (4.1), and the other path is connected to a second three-way (8.2) pipeline by an electromagnetic valve (9), an auxiliary expansion valve (4.2) and the heat exchanger (10); the outlet of the evaporator (3) is connected to the inlet of the gas-liquid separator (2) through a pipeline to form a circulation loop.
2. The multi-stage refrigeration unit of claim 1, wherein:
the suction port of the low-pressure compressor (1.1) is connected with a first return oil separator (6.1) and a first tee joint (8.1), and refrigerating machine oil contained in the refrigerant can be separated out in the first return oil separator (6.1) and flows to the bottom of the first tee joint (8.1) along the wall of the pipe, so that oil in the refrigerant is prevented from being deposited in the low-pressure compressor (1.1).
3. The multi-stage refrigeration unit of claim 1, wherein:
the suction port of the high-pressure compressor (1.2) is connected with a second return-air oil separator (6.2) and a second tee joint (8.2), and refrigerating machine oil contained in the refrigerant can be separated out in the second return-air oil separator (6.2) and flows to the bottom of the second tee joint (8.2) along the wall of the pipe, so that oil in the refrigerant is prevented from being deposited in the high-pressure compressor (1.2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120894594.0U CN214620159U (en) | 2021-04-28 | 2021-04-28 | Multi-stage refrigerating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120894594.0U CN214620159U (en) | 2021-04-28 | 2021-04-28 | Multi-stage refrigerating unit |
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| CN214620159U true CN214620159U (en) | 2021-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114791181A (en) * | 2022-04-18 | 2022-07-26 | 东南大学 | Two-stage compressed air source heat pump system based on oil balancing oil way balancing device |
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2021
- 2021-04-28 CN CN202120894594.0U patent/CN214620159U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114791181A (en) * | 2022-04-18 | 2022-07-26 | 东南大学 | Two-stage compressed air source heat pump system based on oil balancing oil way balancing device |
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