CN107588581B - Heat pump unit system and flash tank structure thereof - Google Patents
Heat pump unit system and flash tank structure thereof Download PDFInfo
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- CN107588581B CN107588581B CN201711021527.2A CN201711021527A CN107588581B CN 107588581 B CN107588581 B CN 107588581B CN 201711021527 A CN201711021527 A CN 201711021527A CN 107588581 B CN107588581 B CN 107588581B
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- 239000003507 refrigerant Substances 0.000 claims abstract description 170
- 238000010438 heat treatment Methods 0.000 claims abstract description 167
- 239000007788 liquid Substances 0.000 claims abstract description 146
- 238000005057 refrigeration Methods 0.000 claims abstract description 63
- 230000001502 supplementing effect Effects 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 16
- 230000006854 communication Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 13
- 239000000110 cooling liquid Substances 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 9
- 239000011552 falling film Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 description 19
- 238000001704 evaporation Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 10
- 238000000926 separation method Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000007175 bidirectional communication Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a flash tank structure, comprising: a hollow tank; the first pipeline is partially arranged in the tank body and is provided with a refrigeration inlet and a heating liquid outlet, and the heating liquid outlet is communicated with the tank body; the second pipeline is partially arranged in the tank body and is provided with a heating inlet and a refrigerating liquid taking port, and the refrigerating liquid taking port is communicated with the tank body; the distance from the heating liquid taking port to the bottom of the tank body is greater than the distance from the refrigerating liquid taking port to the bottom of the tank body. Such that: the refrigerant demand is many during refrigeration, and the refrigeration liquid taking port can absorb sufficient refrigerant in order to guarantee the system operation, and the refrigerant demand is few during heating, and unnecessary refrigerant can be stored in the jar body and can not enter into in the liquid taking port of heating, avoids unnecessary refrigerant to influence the reliability of system operation for heat pump unit system can steady operation. The invention also provides a heat pump unit system.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a heat pump unit system and a flash tank structure thereof.
Background
At present, the air-cooled screw type heat pump unit is widely applied to public places such as markets, hotels, hospitals and the like due to the simple structure, reliable operation and adjustable load, and adopts a heat exchanger to realize heat exchange of a refrigerant so as to achieve the purposes of refrigeration and heating. In general, the air-cooled screw heat pump unit generally adopts a flooded heat exchanger to realize heat exchange, but the flooded heat exchanger has large surplus refrigerant quantity due to large difference of volumes of fins and shell pipes, the surplus refrigerant is difficult to balance, the problem that the system refrigerant needs more during refrigeration and the system refrigerant needs less during heating exists, and the operation reliability is poor, so that the normal operation of the air-cooled screw heat pump unit is influenced.
Disclosure of Invention
Based on the above, it is necessary to provide a flash tank structure capable of storing excess refrigerant during heating and ensuring sufficient refrigerant during cooling so as to ensure reliable system operation, and also provide a heat pump unit system comprising the flash tank structure, aiming at the problem that the heat exchanger of the current air-cooled screw heat pump unit is difficult to balance with excess refrigerant so as to cause poor operation reliability of the heat pump unit.
The above purpose is achieved by the following technical scheme:
a flash tank structure comprising:
a hollow tank;
the first pipeline is partially arranged in the tank body and is provided with a refrigeration inlet and a heating liquid outlet, and the heating liquid outlet is communicated with the tank body; and
The second pipeline is partially arranged in the tank body and is provided with a heating inlet and a refrigerating liquid taking opening, and the refrigerating liquid taking opening is communicated with the tank body;
the distance from the heating liquid taking port to the bottom of the tank body is greater than the distance from the refrigerating liquid taking port to the bottom of the tank body.
In one embodiment, the refrigerating liquid taking port is located at the bottom of the tank body, and the heating liquid taking port is located in the middle area of the tank body.
In one embodiment, the volume of the space defined by the horizontal plane of the refrigerating liquid taking port, the horizontal plane of the heating liquid taking port and the inner wall of the tank body is 15% -25% of the volume of the tank body.
In one embodiment, the flash tank structure further comprises a first valve, a second valve and a third pipeline, wherein the third pipeline is provided with a heating outlet, the third pipeline is communicated with the heating inlet and outlet, and the third pipeline is also communicated with the tank body through the heating outlet;
the first valve is arranged on the second pipeline and is used for conducting unidirectional from the refrigeration liquid taking port to the heating port; the second valve is arranged on the third pipeline and is used for conducting unidirectional from the heating inlet to the heating outlet.
In one embodiment, the first valve is a piston check valve, a diaphragm check valve, or a solenoid valve;
the second valve is a piston type one-way valve, a diaphragm type one-way valve or an electromagnetic valve.
In one embodiment, the distance from the heating outlet to the bottom of the tank body is less than or equal to the distance from the heating liquid outlet to the bottom of the tank body;
or the distance from the heating outlet to the bottom of the tank body is larger than the distance from the heating liquid taking port to the bottom of the tank body.
In one embodiment, the flash tank structure further comprises a gas supplementing pipe, the gas supplementing pipe is partially arranged in the tank body, one end of the gas supplementing pipe is suitable for being communicated with the compressor, and the other end of the gas supplementing pipe is communicated with the tank body.
In one embodiment, the flash tank structure further comprises a separation component, the separation component separates the tank body into a first chamber and a second chamber located below the first chamber, the heating liquid taking port, the cooling liquid taking port and the heating outlet are all communicated with the second chamber, and the air supplementing pipe is communicated with the first chamber.
In one embodiment, the separation member is a liquid baffle or a filter member.
The heat pump unit system comprises a compressor, a first heat exchanger, a refrigeration throttling structure, a heating throttling structure, a second heat exchanger, a gas-liquid separator and a flash tank structure which are sequentially connected in series;
the flash tank structure is positioned between the refrigeration throttling structure and the heating throttling structure, a refrigeration inlet and a refrigeration outlet of the flash tank structure are communicated with the refrigeration throttling structure, and a heating inlet and a heating outlet of the flash tank structure are communicated with the heating throttling structure;
the air suction port of the compressor is communicated with the gas-liquid separator.
In one embodiment, the heat pump unit system further includes a first filter and a second filter, the first filter is disposed between the first heat exchanger and the refrigeration throttle structure, and the second filter is disposed between the heating throttle structure and the second heat exchanger.
In one embodiment, the refrigeration throttling structure is an electronic expansion valve, a thermal expansion valve, a capillary tube or a throttling orifice plate capable of bidirectional communication;
the heating throttling structure is an electronic expansion valve, a thermal expansion valve, a capillary tube or a throttling orifice plate which can bidirectionally circulate.
In one embodiment, the first heat exchanger is a flooded evaporator, a falling film evaporator, or a dry evaporator;
the second heat exchanger is a flooded evaporator, a falling film evaporator or a dry evaporator.
In one embodiment, the heat pump unit system further comprises a four-way valve, a first port of the four-way valve is communicated with the exhaust port of the compressor, a second port of the four-way valve is communicated with the first heat exchanger, a third port of the four-way valve is communicated with the inlet of the gas-liquid separator, and a fourth port of the four-way valve is communicated with the second heat exchanger.
In one embodiment, the heat pump unit system has a cooling mode;
the refrigerant sequentially flows through the compressor, the four-way valve, the first heat exchanger, the first filter, the refrigeration throttling structure, the flash tank, the heating throttling structure, the second filter, the second heat exchanger and the gas-liquid separator and returns to the compressor;
and the refrigerant enters from the refrigerating inlet and outlet, and flows out from the heating inlet and outlet after heat exchange.
In one embodiment, the heat pump unit system has a heating mode;
the refrigerant sequentially flows through the compressor, the four-way valve, the second heat exchanger, the second filter, the heating throttling structure, the flash tank, the refrigerating throttling structure, the first filter and the first heat exchanger and returns to the compressor;
and the refrigerant enters from the heating inlet and outlet, and flows out from the cooling inlet and outlet after heat exchange.
In one embodiment, the heat pump unit system further comprises a liquid separator, wherein the liquid separator is arranged on the first heat exchanger, and the liquid separator can enable the refrigerant to uniformly flow into the first heat exchanger.
After the technical scheme is adopted, the beneficial effects of the invention are as follows:
according to the heat pump unit system and the flash tank structure thereof, the flash tank structure can absorb heat by evaporation to the refrigerant in the heat pump unit system so as to ensure the refrigerating and heating performance of the heat pump unit system, and during refrigeration, the refrigerant flows into the first pipeline through the refrigerating inlet and the refrigerating outlet, enters the tank body through the heating liquid outlet, flows into the second pipeline from the refrigerating liquid outlet and flows out through the heating inlet and the refrigerating outlet; during heating, the refrigerant flows into the second pipeline through the heating inlet and outlet, flows into the tank body through the refrigerating liquid taking port, flows into the first pipeline from the heating liquid taking port and flows out through the refrigerating inlet and outlet, and the distance from the heating liquid taking port to the bottom of the tank body is larger than that from the refrigerating liquid taking port to the bottom of the tank body; the problem that the heat pump unit has poor operation reliability due to the fact that surplus refrigerant is difficult to balance in a heat exchanger of an existing air-cooled screw heat pump unit is effectively solved, and the heat pump unit is made to be: the refrigerant demand is many during refrigeration, and the refrigeration liquid taking port can absorb sufficient refrigerant in order to guarantee the system operation, and the refrigerant demand is few during heating, and unnecessary refrigerant can be stored in the jar body and can not enter into in the liquid taking port of heating, avoids unnecessary refrigerant to influence the reliability of system operation for heat pump unit system can steady operation.
Drawings
FIG. 1 is a system flow diagram of a heat pump unit system according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a flash tank structure in the heat pump unit system shown in FIG. 1;
wherein:
1-a compressor;
2-a first heat exchanger;
3-a refrigeration throttle structure;
4-heating throttle structure;
5-a second heat exchanger;
6-a gas-liquid separator;
7-flash tank structure;
71-a tank body;
72-a first line; 721-refrigeration access; 722-heating liquid extracting port;
73-a second line; 731-heating doorway; 732-refrigerating liquid taking port;
74-a third line; 741-heating outlet;
75-a first valve;
76-a second valve;
77-a partition member;
78-air supplementing pipe;
8-a first filter;
9-a second filter;
10-a four-way valve;
11-knockout;
12-a fan;
13-oil separator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the heat pump unit system and the flash tank structure thereof according to the present invention will be described in further detail by examples below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1 and 2, the present invention provides a flash tank structure 7, where the flash tank structure 7 is applied to a heat pump unit system, and the flash tank structure 7 can perform evaporation and heat absorption operations on a refrigerant entering the flash tank structure 7 so as to reduce the temperature of the refrigerant therein, thereby realizing the refrigerating and heating functions of the heat pump unit system. The flash tank structure 7 has the function of storing the refrigerant, can store the redundant refrigerant during heating, can ensure sufficient refrigerant during refrigeration, effectively solves the problem that the heat pump unit has poor operation reliability due to the fact that the redundant refrigerant is difficult to balance in the heat exchanger of the traditional air-cooled screw heat pump unit, and avoids the influence of the redundant refrigerant on the operation reliability of the system during heating, so that the heat pump unit system can stably operate.
In the present invention, the flash tank structure 7 includes a hollow tank 71, a first pipe 72, and a second pipe 73. The tank 71 can accommodate the refrigerant, the refrigerant before heat exchange flows into the tank 71, the refrigerant realizes the evaporation and heat absorption operation in the tank 71, and the refrigerant after heat exchange can flow out of the tank 71 and flow into other structures of the heat pump unit system to realize the refrigeration or heating operation. The first pipe 72 and the second pipe 73 are used for inputting or outputting the refrigerant, and when the first pipe 72 inputs the refrigerant, the second pipe 73 outputs the refrigerant; when the second line 73 inputs the refrigerant, the first line 72 outputs the refrigerant.
Specifically, the first pipe 72 is partially disposed in the tank 71, and the first pipe 72 has a cooling inlet 721 and a heating liquid outlet 722, and the heating liquid outlet 722 communicates with the tank 71. The second pipe 73 is partially disposed in the tank 71, and the second pipe 73 has a heating inlet 731 and a cooling liquid outlet 732, and the cooling liquid outlet 732 communicates with the tank 71. The cooling inlet 721 and the heating inlet 731 are respectively connected to the heat pump unit system. When the heat pump unit system refrigerates, the flow direction of the refrigerant of the flash tank structure 7 is as follows: the refrigerant flows into the first pipe 72 through the cooling inlet 721, flows into the tank 71 through the heating liquid outlet 722, exchanges heat, flows into the second pipe 73 through the cooling liquid outlet 732, and flows out through the heating inlet 731. When the heat pump unit system heats, the flow direction of the refrigerant of the flash tank structure 7 is as follows: the refrigerant flows into the second pipeline 73 through the heating inlet and outlet 731, flows into the tank 71 through the cooling liquid outlet 732, exchanges heat, flows into the first pipeline 72 through the heating liquid outlet 722, and flows out through the cooling inlet and outlet 721. In addition, the flash tank structure 7 can realize bidirectional flow of the heat pump unit system during cooling and heating, so that the pipeline design of the system can be simplified, the complexity of the system is reduced, and the control is convenient.
Meanwhile, the distance from the heating liquid taking port 722 to the bottom of the tank 71 is larger than the distance from the cooling liquid taking port 732 to the bottom of the tank 71. That is, the heating liquid taking port 722 is located at a plane higher than the plane of the cooling liquid taking port 732. The tank 71 can play a role in storing the refrigerant, when the refrigerant is output from the tank 71, the second pipeline 73 can output more refrigerant because the position of the heating liquid taking port 722 is higher and the position of the cooling liquid taking port 732 is lower, the output amount of the refrigerant from the first pipeline 72 is limited to a certain extent, and the output amount of the refrigerant is less than that of the refrigerant output from the second pipeline 73, so that the requirement of the heat pump unit system for less refrigerant during heating is just met, and the use requirement of the system can be met during cooling is ensured. In this way, during heating, the surplus refrigerant of the heat pump unit system can be stored in the tank body 71 of the flash tank structure 7, and cannot be sucked away by the first pipeline 72 through the heating liquid outlet 722, so that the influence of the surplus refrigerant on the operation reliability of the heat pump unit system is avoided; meanwhile, the tank body 71 of the flash tank structure 7 can also provide enough refrigerant for the heat pump unit system during refrigeration, so that the system can normally operate, and the service performance of the heat pump unit system is ensured.
It will be appreciated that the medium pressure medium temperature refrigerant gas-liquid mixture enters the tank 71 of the flash tank structure 7, and the medium pressure medium temperature refrigerant gas-liquid mixture can flash down in the tank 71 such that the medium pressure medium temperature refrigerant gas-liquid mixture becomes a medium pressure low temperature refrigerant liquid and flows out of the tank 71 of the flash tank structure 7. Therefore, the supercooling degree of the heat pump unit system can be increased, the energy efficiency ratio of the system is improved, and the energy efficiency of the system operation is improved.
Further, the refrigerating liquid taking port 732 is located at the bottom of the tank 71, and the heating liquid taking port 722 is located in the middle region of the tank 71. The refrigeration liquid taking port 732 is located in the bottom area of the tank 71, and a certain gap is formed between the refrigeration liquid taking port 732 and the bottom surface of the tank 71, so that the refrigerant can flow, and the refrigerant can flow in or out from the refrigeration liquid taking port 732, so that the supercooling effect of the flash tank structure 7 is ensured. In addition, the heating liquid-taking port 722 is located in the middle area of the tank 71, so that the tank 71 can store redundant refrigerant during heating, the volume of the tank 71 storing redundant refrigerant is ensured, the liquid-carrying operation of the heat pump unit system is avoided, and the operation reliability of the heat pump unit system is improved.
Preferably, the volume of the space defined by the horizontal plane of the cooling liquid taking port 732, the horizontal plane of the heating liquid taking port 722 and the inner wall of the tank 71 is 15% -25% of the volume of the tank 71. That is, the volume of the tank 71, which is different between the cooling liquid taking port 732 and the heating liquid taking port 722, can hold the total amount of the refrigerant 15% -25% of the total refrigerant filling amount of the tank 71. In this way, the tank 71 has a sufficient volume to store the excess refrigerant during heating, and also has sufficient refrigerant in the heat pump unit system during cooling, so that the heat pump unit system operates reliably.
As an embodiment, the flash tank structure 7 further includes a first valve 75, a second valve 76, and a third pipe 74, the third pipe 74 having a heating outlet 741, the third pipe 74 being in communication with the heating inlet 731, the third pipe 74 being further in communication with the tank 71 through the heating outlet 741. The first valve 75 is disposed on the second pipeline 73, and is used for unidirectional conduction from the refrigeration liquid taking port 732 to the heating port 731; the second valve 76 is provided in the third pipe 74 and is configured to be in one-way communication with the heating outlet 741 from the heating inlet 731. The first valve 75 and the second valve 76 have a function of unidirectional conduction, and when the first valve 75 is opened, the refrigerant can flow from the refrigeration liquid extraction port 732 to the heating port 731, but cannot flow from the heating port 731 to the refrigeration liquid extraction port 732; when the second valve 76 is opened, the refrigerant can flow from the heating inlet and outlet 731 to the heating outlet 741, and cannot flow from the heating outlet 741 to the heating inlet and outlet 731. The two-way flow of the refrigerant in the flash tank structure 7 can be realized, so that the pipeline design of the system can be simplified, the complexity of the system is reduced, and the control is convenient; in addition, when the refrigerant flows in two directions, the refrigerant can absorb heat by evaporation in the tank body 71 of the flash tank structure 7, so that the evaporator effect of the flash tank structure 7 is realized, the supercooling degree of the system operation and the capacity and energy efficiency of the system operation are improved, and the system operation of the heat pump unit is stable and reliable. It will be appreciated that the third conduit 74 may be a bypass branch on the second conduit 73; the second and third pipelines 73 and 74 may be three-way pipes.
Further, the distance from the heating outlet 741 to the bottom of the tank 71 is smaller than or equal to the distance from the heating liquid outlet 722 to the bottom of the tank 71, so that the supercooling degree of the heat pump unit system can be ensured. Of course, in other embodiments of the present invention, the distance from the heating outlet 741 to the bottom of the tank 71 is greater than the distance from the heating liquid outlet 722 to the bottom of the tank 71. In this embodiment, the heating outlet 741 and the heating liquid outlet 722 are arranged in a coplanar manner, so that the refrigerant can be conveniently sent out from the heating liquid outlet 722 while the supercooling degree of the heat pump unit system is ensured.
Preferably, the first valve 75 is a piston check valve, a diaphragm check valve, a controllable on and off solenoid valve, or other structure capable of achieving unidirectional communication. The second valve 76 is a piston check valve, a diaphragm check valve, a solenoid valve that can be controlled to open and close, or other structure capable of achieving unidirectional communication. In this way, the flow track of the refrigerant in the tank body 71 of the flash tank structure 7 can be ensured to be fixed, the mixed flow is avoided to influence the flow of the refrigerant, and the operation reliability of the heat pump unit system is ensured.
As an embodiment, the flash tank structure 7 further includes a gas supplementing pipe 78, a part of the gas supplementing pipe 78 is disposed in the tank 71, one end of the gas supplementing pipe 78 is adapted to be communicated with the compressor 1, and the other end of the gas supplementing pipe 78 is communicated with the tank 71. The air supplementing pipe 78 is used for communicating an air supplementing end of the compressor 1, part of refrigerant evaporates in the tank body 71 of the flash tank structure 7, and evaporated steam enters the compressor 1 through the air supplementing pipe 78 so as to ensure that the compressor 1 operates normally. Also, the vaporized refrigerant is able to take away heat, so that the temperature of the refrigerant at the bottom of the tank body 71 of the flash tank structure 7 is lowered, changing from medium-pressure medium-temperature refrigerant to medium-pressure low-temperature refrigerant.
Further, the flash tank structure 7 further includes a partition member 77, the partition member 77 partitions the tank 71 into a first chamber and a second chamber located below the first chamber, the heating liquid-taking port 722, the cooling liquid-taking port 732 and the heating outlet 741 are all communicated with the second chamber, and the air supplementing pipe 78 is communicated with the first chamber. The separation part 77 can prevent the refrigerant mixed with gas and liquid from splashing to the end part of the air supplementing pipe 78 and entering the compressor 1 through the air supplementing pipe 78, so that the air supplementing and liquid carrying of the compressor 1 is avoided, the running reliability of the compressor 1 is improved, and the running stability of a heat pump unit system is ensured. Meanwhile, the refrigerating liquid taking port 732, the heating liquid taking port 722 and the heating outlet 741 are positioned in the second chamber, and can conveniently send out and suck away the refrigerant. Further, the separation member 77 is a liquid baffle or a filtering member, so as to prevent the refrigerant mixed with the gas and the liquid from splashing to the air supplementing pipe 78, avoid the situation that the air supplementing of the compressor 1 is carried with the liquid, and improve the operation reliability of the compressor 1. Of course, in other embodiments of the present invention, the partition member 77 may have other structures that can prevent the liquid refrigerant from entering the gas supply pipe 78.
The invention also provides a heat pump unit system, which comprises a compressor 1, a first heat exchanger 2, a refrigeration throttling structure 3, a heating throttling structure 4, a second heat exchanger 5, a gas-liquid separator 6 and a flash tank structure 7 in the embodiment. The flash tank structure 7 is located between the refrigeration throttle structure 3 and the heating throttle structure 4, and the refrigeration inlet 721 of the flash tank structure 7 is communicated with the refrigeration throttle structure 3, and the heating inlet 731 of the flash tank structure 7 is communicated with the heating throttle structure 4. The suction port of the compressor 1 communicates with the gas-liquid separator 6. The heat pump unit system has a simple structure, the flash tank structure 7, the refrigeration throttling structure 3 and the heating throttling structure 4 realize bidirectional circulation of the refrigerant in refrigeration and heating modes, and the refrigeration and heating control is convenient. The method comprises the following steps:
when the heat pump unit system is used for refrigerating, high-temperature and high-pressure refrigerant gas discharged by the compressor 1 enters the first heat exchanger 2 for condensation, and medium-temperature and high-pressure refrigerant liquid after condensation is subjected to first throttling and depressurization in the refrigerating and throttling structure 3; the gas-liquid mixture of the medium-pressure medium-temperature refrigerant after throttling and depressurization enters the flash tank structure 7, part of the refrigerant evaporates in the tank body 71 of the flash tank structure 7, and the evaporated steam enters the medium-pressure cavity of the compressor 1 through the air supplementing pipe 78 of the flash tank structure 7; the evaporated steam takes away heat, so that the temperature of the refrigerant at the bottom of the tank body 71 of the flash tank structure 7 is reduced, the refrigerant is changed into low-temperature medium-pressure refrigerant liquid, the low-temperature medium-pressure refrigerant liquid leaves the flash tank structure 7 and enters the heating throttling structure 4, the refrigerant is changed into low-temperature low-pressure refrigerant gas-liquid mixture after being subjected to secondary throttling and depressurization through the heating throttling structure 4, the low-temperature low-pressure refrigerant gas-liquid mixture enters the second heat exchanger 5 to be evaporated, and the low-temperature low-pressure refrigerant gas-liquid mixture is changed into low-temperature low-pressure refrigerant steam after being evaporated and absorbed in the second heat exchanger 5 to enter the compressor 1, so that the complete cycle is realized.
When the heat pump set system heats, high-temperature and high-pressure refrigerant gas discharged by the compressor 1 enters the second heat exchanger 5 to be condensed, and medium-temperature and high-pressure refrigerant liquid after condensation enters the heating throttling structure 4 to be throttled and depressurized for the first time; the gas-liquid mixture of the medium-pressure medium-temperature refrigerant after throttling and depressurization enters the flash tank structure 7, part of the refrigerant evaporates in the tank body 71 of the flash tank structure 7, and the evaporated steam enters the medium-pressure cavity of the compressor 1 through the air supplementing pipe 78 of the flash tank structure 7; the evaporated steam takes away heat, so that the temperature of the refrigerant at the bottom of the tank body 71 of the flash tank structure 7 is reduced, the low-temperature medium-pressure refrigerant liquid leaves the flash tank structure 7 and enters the refrigeration throttling structure 3, the refrigerant gas-liquid mixture which is changed into low-temperature low-pressure after the second throttling and depressurization enters the first heat exchanger 2 for evaporation, and the refrigerant steam which is changed into low-temperature low-pressure after the evaporation and heat absorption in the first heat exchanger 2 enters the compressor 1; this is a complete cycle.
The flash tank structure 7 realizes refrigerating and heating flow through the first valve 75 and the second valve 76 inside, so that the heat pump unit system realizes bidirectional circulation of the heat pump unit system through the flash tank structure 7, and realizes that the flash tank structure 7 stores redundant refrigerant in the system in a heating mode through the position of the heating liquid taking port 722 being higher than the position of the refrigerating liquid taking port 732, thereby avoiding the influence of the redundant refrigerant in the heating mode on the reliability of the operation of the compressor 1 and the system. In addition, the flash tank structure 7, the refrigeration throttling structure 3 and the heating throttling structure 4 realize bidirectional circulation of the refrigerant in refrigeration and heating modes, so that the system pipeline arrangement can be simplified, the complexity of the system is reduced, the simplification of a system flow path is realized, the pipeline pressure drop of the system flow path is reduced, and the performance and the running reliability of the heat pump unit system are improved; meanwhile, the refrigerating and heating functions are realized without arranging unidirectional flowing flow paths respectively, so that the pipeline is simple in structure, welding spots are reduced, and the assembly efficiency and the reliability of after-sales operation are improved.
Optionally, the refrigeration throttling structure 3 is an electronic expansion valve, a thermal expansion valve, a capillary tube, a throttling orifice plate or other structures capable of realizing bidirectional communication and throttling. In the present embodiment, the refrigeration throttle structure 3 is a refrigeration electronic expansion valve that circulates in both directions. The heating throttling structure 4 is an electronic expansion valve, a thermal expansion valve, a capillary tube or other structures which can realize bidirectional communication and throttle. In the present embodiment, the heating throttle structure 4 is a heating electronic expansion valve that flows in both directions.
Alternatively, the first heat exchanger 2 is a flooded evaporator, a falling film evaporator, a dry evaporator, or other structures capable of absorbing heat from evaporation of the refrigerant. The second heat exchanger 5 is a flooded evaporator, a falling film evaporator, a dry evaporator or other structures capable of realizing evaporation and heat absorption of the refrigerant. It can be understood that the refrigerant is rich in heat in both flooded evaporators and other types of heat exchangers such as falling film evaporators and dry evaporators, so that when the heat exchanger is used in combination with the flash tank structure 7 of the present invention, the flash tank structure 7 can store rich refrigerant in heating, and the reliability of the compressor 1 and the system operation is prevented from being affected by the rich refrigerant; meanwhile, the sufficient refrigerant demand of the heat pump unit system during refrigeration can be ensured, so that the heat pump unit system operates stably.
As an embodiment, the heat pump unit system further includes a first filter 8 and a second filter 9, where the first filter 8 is disposed between the first heat exchanger 2 and the refrigeration throttle structure 3, and the second filter 9 is disposed between the heating throttle structure 4 and the second heat exchanger 5. The positional relationship among the first filter 8, the second filter 9, the refrigeration throttle structure 3, the heating throttle structure 4 and the flash tank structure 7 is as follows: a first filter 8, a refrigeration throttle structure 3, a flash tank structure 7, a heating throttle structure 4 and a second filter 9. That is, during refrigeration, the medium-temperature high-pressure refrigerant liquid flowing out of the first heat exchanger 2 enters the first filter 8 for filtration, and enters the refrigeration throttling structure 3 for throttling and depressurization; during heating, medium-temperature high-pressure refrigerant liquid flowing out of the second heat exchanger 5 is filtered by the second filter 9 and then enters the heating throttling structure 4 to be throttled and depressurized. The first filter 8 is used for drying the refrigerant, and specifically filtering the refrigerant before entering the refrigeration throttling structure 3, so as to ensure that the refrigeration throttling structure 3 operates reliably. The second filter 9 is used for drying the refrigerant, and specifically filtering the refrigerant before entering the heating throttling structure 4, so as to ensure that the heating throttling structure 4 operates reliably. Preferably, the first filter 8 is a dry filter or other structure capable of achieving filtration and drying of the refrigerant liquid at medium temperature and high pressure, such as a dryer, etc.; the second filter 9 is a dry filter or other structure capable of achieving filtration drying of the refrigerant liquid at a medium temperature and a high pressure, such as a dryer or the like.
Further, the heat pump unit system further comprises a four-way valve 10, a first interface a of the four-way valve 10 is communicated with an exhaust port of the compressor 1, a second interface b of the four-way valve 10 is communicated with the first heat exchanger 2, a third interface c of the four-way valve 10 is communicated with an inlet of the gas-liquid separator 6, and a fourth interface d of the four-way valve 10 is communicated with the second heat exchanger 5. The four-way valve 10 is used for realizing communication between the compressor 1 and each part, and the four-way valve 10 is used for realizing switching of a heat pump unit system in a refrigerating mode and a heating mode. The heat pump unit system further includes a liquid separator 11, the liquid separator 11 being disposed on the first heat exchanger 2, the liquid separator 11 being capable of uniformly flowing the refrigerant into the first heat exchanger 2. The liquid separator 11 is positioned between the first heat exchanger 2 and the dry filter, and during refrigeration, condensed medium-temperature high-pressure refrigerant liquid enters the dry filter through the liquid separator 11; during heating, the low-temperature low-pressure refrigerant gas-liquid mixture subjected to the second throttling and depressurization passes through the first filter 8 and then enters the liquid separator 11, and liquid separation is performed in the liquid separator 11, so that the refrigerant uniformly enters the first heat exchanger 2. The knockout 11 can decompress and divide the refrigerant of the gas-liquid mixture so that the flow rate of the refrigerant in the first heat exchanger 2 is uniform. Further, the heat pump unit system further comprises a fan 12, and the fan 12 is arranged in the first heat exchanger 2 and is used for exchanging heat with the first heat exchanger 2. The heat pump unit system further comprises an oil separator 13, wherein the oil separator 13 is arranged between the first interface of the four-way valve 10 and the exhaust port of the compressor 1 and is used for separating lubricating oil mixed in the refrigerant discharged by the compressor 1 so as to ensure the operation reliability of the heat pump unit system. It can be understood that the communication between each component in the heat pump unit system is realized through a pipeline, and details are not described here.
The heat pump unit system has a cooling mode:
the refrigerant sequentially flows through the compressor 1, the four-way valve 10, the first heat exchanger 2, the first filter 8, the refrigeration throttling structure 3, the flash tank, the heating throttling structure 4, the second filter 9, the second heat exchanger 5 and the gas-liquid separator 6, and returns to the compressor 1; the refrigerant enters through the cooling inlet 721, exchanges heat, and flows out through the heating inlet 731. Specifically, when the heat pump unit system is used for refrigerating, the high-temperature and high-pressure refrigerant gas discharged by the compressor 1 is subjected to oil-gas separation through the oil separator 13, enters the first heat exchanger 2 through the four-way valve 10 for condensation, and the condensed medium-temperature and high-pressure refrigerant liquid enters the refrigerating and throttling structure 3 after being dried and filtered through the liquid separator 11 and the first filter 8, and is subjected to first throttling and depressurization in the refrigerating and throttling structure 3; the gas-liquid mixture of the medium-pressure medium-temperature refrigerant after throttling and depressurization enters the flash tank structure 7, part of the refrigerant evaporates in the tank body 71 of the flash tank structure 7, and the evaporated steam enters the medium-pressure cavity of the compressor 1 through the air supplementing pipe 78 of the flash tank structure 7; the evaporated steam takes away heat, so that the temperature of the refrigerant at the bottom of the tank body 71 of the flash tank structure 7 is reduced, the refrigerant is changed into low-temperature medium-pressure refrigerant liquid, the low-temperature medium-pressure refrigerant liquid leaves the flash tank structure 7 and enters the heating throttling structure 4, the low-temperature low-pressure refrigerant gas-liquid mixture is changed into low-temperature low-pressure refrigerant gas-liquid mixture after the second throttling and depressurization by the heating throttling structure 4, the low-temperature low-pressure refrigerant gas-liquid mixture enters the second heat exchanger 5 to be evaporated by the second filter 9, and the low-temperature low-pressure refrigerant gas-liquid mixture is changed into low-temperature low-pressure refrigerant steam after the evaporation and heat absorption in the second heat exchanger 5 to enter the compressor 1, so that the low-temperature low-pressure refrigerant gas-liquid mixture is a complete cycle.
The heat pump unit system has a heating mode:
the refrigerant sequentially flows through the compressor 1, the four-way valve 10, the second heat exchanger 5, the second filter 9, the heating throttling structure 4, the flash tank, the refrigerating throttling structure 3, the first filter 8 and the first heat exchanger 2 and returns to the compressor 1; the refrigerant enters from the heating inlet and outlet 731, exchanges heat, and flows out from the cooling inlet and outlet 721. Specifically, when the heat pump unit system heats, the high-temperature and high-pressure refrigerant gas discharged by the compressor 1 is subjected to oil-gas separation through the oil separator 13, the high-temperature and high-pressure refrigerant gas enters the second heat exchanger 5 to be condensed after passing through the four-way valve 10, and the condensed medium-temperature and high-pressure refrigerant liquid enters the heating throttling structure 4 to be throttled and depressurized for the first time after being dried and filtered by the second filter 9; the gas-liquid mixture of the medium-pressure medium-temperature refrigerant after throttling and depressurization enters the flash tank structure 7, part of the refrigerant evaporates in the tank body 71 of the flash tank structure 7, and the evaporated steam enters the medium-pressure cavity of the compressor 1 through the air supplementing pipe 78 of the flash tank structure 7; the evaporated steam takes away heat, so that the temperature of the refrigerant at the bottom of the tank body 71 of the flash tank structure 7 is reduced, the low-temperature medium-pressure refrigerant liquid leaves the flash tank structure 7 and enters the refrigeration throttling structure 3, the refrigerant gas-liquid mixture which is changed into low-temperature low-pressure after the second throttling and depressurization enters the liquid separator 11 after passing through the first filter 8, the liquid is separated in the liquid separator 11, the refrigerant uniformly enters the first heat exchanger 2 to be evaporated, and the refrigerant steam which is changed into low-temperature low-pressure after the evaporation and heat absorption in the first heat exchanger 2 enters the compressor 1; this is a complete cycle.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be regarded as the description scope of the present specification.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (16)
1. A flash tank structure comprising:
a hollow tank (71);
a first pipe (72) partially disposed in the tank (71), the first pipe (72) having a refrigeration inlet (721) and a heating liquid outlet (722), the heating liquid outlet (722) being in communication with the tank (71); and
A second pipeline (73) which is partially arranged in the tank body (71), wherein the second pipeline (73) is provided with a heating inlet (731) and a refrigerating liquid taking port (732), and the refrigerating liquid taking port (732) is communicated with the tank body (71);
the distance from the heating liquid taking port (722) to the bottom of the tank body (71) is larger than the distance from the refrigerating liquid taking port (732) to the bottom of the tank body (71);
wherein, the first pipeline (72) and the second pipeline (73) are both used for inputting or outputting the refrigerant, and when the first pipeline (72) inputs the refrigerant, the second pipeline (73) outputs the refrigerant; when the second pipeline (73) inputs the refrigerant, the first pipeline (72) outputs the refrigerant;
the flash tank structure (7) further comprises a first valve (75), a second valve (76) and a third pipeline (74), wherein the third pipeline (74) is provided with a heating outlet (741), the third pipeline (74) is communicated with the heating inlet (731), and the third pipeline (74) is further communicated with the tank body (71) through the heating outlet (741);
the first valve (75) is arranged on the second pipeline (73) and is used for conducting unidirectional from the refrigeration liquid taking port (732) to the heating inlet (731); the second valve (76) is arranged on the third pipeline (74) and is used for conducting unidirectional from the heating inlet (731) to the heating outlet (741).
2. The flash tank structure according to claim 1, wherein the refrigeration liquid taking port (732) is located at the bottom of the tank body (71), and the heating liquid taking port (722) is located in a middle region of the tank body (71).
3. The flash tank structure according to claim 2, wherein the volume of a space defined by the horizontal plane of the refrigerating liquid taking port (732), the horizontal plane of the heating liquid taking port (722) and the inner wall of the tank body (71) is 15% -25% of the volume of the tank body (71).
4. Flash tank structure according to claim 1, wherein the first valve (75) is a piston check valve, a diaphragm check valve or a solenoid valve;
the second valve (76) is a piston type one-way valve, a diaphragm type one-way valve or an electromagnetic valve.
5. Flash tank structure according to claim 1, wherein the distance from the heating outlet (741) to the bottom of the tank (71) is equal to or less than the distance from the heating liquid withdrawal port (722) to the bottom of the tank (71);
or, the distance from the heating outlet (741) to the bottom of the tank body (71) is larger than the distance from the heating liquid taking port (722) to the bottom of the tank body (71).
6. The flash tank structure according to any one of claims 1 to 5, wherein the flash tank structure (7) further comprises a gas supplementing tube (78), the gas supplementing tube (78) being partially arranged in the tank body (71), one end of the gas supplementing tube (78) being adapted to communicate with the compressor (1), the other end of the gas supplementing tube (78) being in communication with the tank body (71).
7. The flash tank structure according to claim 6, wherein the flash tank structure (7) further comprises a partition member (77), the partition member (77) partitions the tank body (71) into a first chamber and a second chamber located below the first chamber, the heating liquid outlet (722), the cooling liquid outlet (732) and the heating outlet (741) are all communicated with the second chamber, and the air supplementing tube (78) is communicated with the first chamber.
8. The flash tank structure according to claim 7, wherein the partition member (77) is a liquid baffle or a filter member.
9. A heat pump unit system, characterized by comprising a compressor (1), a first heat exchanger (2), a refrigeration throttling structure (3), a heating throttling structure (4), a second heat exchanger (5), a gas-liquid separator (6) and a flash tank structure (7) according to any of claims 1 to 8, which are connected in series in sequence;
the flash tank structure (7) is positioned between the refrigeration throttling structure (3) and the heating throttling structure (4), a refrigeration inlet and outlet (721) of the flash tank structure (7) is communicated with the refrigeration throttling structure (3), and a heating inlet and outlet (731) of the flash tank structure (7) is communicated with the heating throttling structure (4);
the air suction port of the compressor (1) is communicated with the gas-liquid separator (6).
10. The heat pump unit system according to claim 9, further comprising a first filter (8) and a second filter (9), the first filter (8) being arranged between the first heat exchanger (2) and the refrigeration throttle structure (3), the second filter (9) being arranged between the heating throttle structure (4) and the second heat exchanger (5).
11. Heat pump unit system according to claim 9, characterized in that the refrigeration throttle structure (3) is an electronic expansion valve, a thermostatic expansion valve, a capillary tube or a throttle orifice plate capable of bi-directional flow;
the heating throttling structure (4) is an electronic expansion valve, a thermal expansion valve, a capillary tube or a throttling orifice plate which can flow in two directions.
12. The heat pump unit system according to claim 9, wherein the first heat exchanger (2) is a flooded evaporator, a falling film evaporator or a dry evaporator;
the second heat exchanger (5) is a flooded evaporator, a falling film evaporator or a dry evaporator.
13. The heat pump unit system according to claim 10, further comprising a four-way valve (10), a first port of the four-way valve (10) being in communication with the exhaust port of the compressor (1), a second port of the four-way valve (10) being in communication with the first heat exchanger (2), a third port of the four-way valve (10) being in communication with the inlet of the gas-liquid separator (6), a fourth port of the four-way valve (10) being in communication with the second heat exchanger (5).
14. The heat pump assembly of claim 13, wherein the heat pump assembly has a cooling mode;
refrigerant flows through the compressor (1), the four-way valve (10), the first heat exchanger (2), the first filter (8), the refrigeration throttling structure (3), the flash tank, the heating throttling structure (4), the second filter (9), the second heat exchanger (5) and the gas-liquid separator (6) in sequence and returns to the compressor (1);
the refrigerant enters from the refrigerating inlet and outlet (721), exchanges heat, and flows out from the heating inlet and outlet (731).
15. The heat pump assembly of claim 13, wherein the heat pump assembly has a heating mode;
refrigerant flows through the compressor (1), the four-way valve (10), the second heat exchanger (5), the second filter (9), the heating throttling structure (4), the flash tank, the refrigerating throttling structure (3), the first filter (8) and the first heat exchanger (2) in sequence and returns to the compressor (1);
the refrigerant enters from the heating inlet and outlet (731), exchanges heat, and flows out from the cooling inlet and outlet (721).
16. The heat pump unit system according to claim 9, further comprising a liquid separator (11), the liquid separator (11) being arranged on the first heat exchanger (2), the liquid separator (11) being capable of allowing a uniform flow of refrigerant into the first heat exchanger (2).
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| CN202470553U (en) * | 2012-03-12 | 2012-10-03 | 珠海格力电器股份有限公司 | Refrigeration and heating bidirectional air supply flash evaporator and air conditioner comprising same |
| CN103388940A (en) * | 2012-05-08 | 2013-11-13 | 珠海格力电器股份有限公司 | Bidirectional flash evaporator and air conditioner comprising same |
| CN105091430A (en) * | 2015-09-15 | 2015-11-25 | 珠海格力电器股份有限公司 | Flash evaporator and air conditioning system with same |
| CN207455970U (en) * | 2017-10-26 | 2018-06-05 | 珠海格力电器股份有限公司 | Heat pump unit system and flash tank structure thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202470553U (en) * | 2012-03-12 | 2012-10-03 | 珠海格力电器股份有限公司 | Refrigeration and heating bidirectional air supply flash evaporator and air conditioner comprising same |
| CN103388940A (en) * | 2012-05-08 | 2013-11-13 | 珠海格力电器股份有限公司 | Bidirectional flash evaporator and air conditioner comprising same |
| CN105091430A (en) * | 2015-09-15 | 2015-11-25 | 珠海格力电器股份有限公司 | Flash evaporator and air conditioning system with same |
| CN207455970U (en) * | 2017-10-26 | 2018-06-05 | 珠海格力电器股份有限公司 | Heat pump unit system and flash tank structure thereof |
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