CN211451439U - Transcritical carbon dioxide two-stage compression refrigeration and defrosting system - Google Patents
Transcritical carbon dioxide two-stage compression refrigeration and defrosting system Download PDFInfo
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- CN211451439U CN211451439U CN202020158011.3U CN202020158011U CN211451439U CN 211451439 U CN211451439 U CN 211451439U CN 202020158011 U CN202020158011 U CN 202020158011U CN 211451439 U CN211451439 U CN 211451439U
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Abstract
The utility model discloses a transcritical carbon dioxide doublestage compression refrigeration and defrost system, including being suitable for the compression refrigeration return circuit that carries out the doublestage compression to the carbon dioxide working medium and being suitable for refrigerating system's heat exchanger to carry out the defrosting return circuit that defrosts. The compression refrigeration loop comprises a high-pressure stage compressor, an air cooler group, a heat regenerator, a first pressure reduction structure, an indoor heat exchanger group, a liquid storage device and a low-pressure stage compressor which are sequentially connected and are suitable for carbon dioxide working medium circulation; the defrosting loop comprises a low-pressure compressor, an indoor heat exchanger group, a liquid storage device and a defrosting evaporator which are connected in sequence and are suitable for carbon dioxide working medium to flow through; the utility model discloses can also reduce energy resource consumption when improving defrosting performance.
Description
Technical Field
The utility model relates to the field of refrigeration technology, especially, relate to a transcritical carbon dioxide doublestage compression refrigeration and defrost system.
Background
The frosting phenomenon of the vapor compression refrigeration system in the environment below zero centigrade is an important problem affecting the performance and stable operation of the refrigeration system. At present, the refrigeration industry mainly carries out defrosting operation in an electric heating mode, the defrosting mode of electric heating is general in defrosting effect, corresponding energy consumption is high, especially for a double-stage compression system of carbon dioxide working medium, the internal pressure of the system is high, the pressure difference between a high-pressure side and a low-pressure side is large, and the defrosting method by changing the working medium trend through a four-way reversing valve is difficult to realize.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a transcritical carbon dioxide doublestage compression refrigeration and defrost system to solve the technical problem who optimizes the defrosting effect and reduce the energy consumption.
The utility model discloses a transcritical carbon dioxide doublestage compression refrigeration and defrost system is realized like this:
a transcritical carbon dioxide dual stage compression refrigeration and defrost system comprising:
the system comprises a compression refrigeration loop, a heat exchanger and a heat exchanger, wherein the compression refrigeration loop comprises a high-pressure stage compressor, an air cooler group, a heat regenerator, a first pressure reduction structure, an indoor heat exchanger group, a liquid storage device and a low-pressure stage compressor which are sequentially connected and are suitable for carbon dioxide working medium circulation; wherein the low pressure stage compressor is further connected to the regenerator and the regenerator is connected to the high pressure stage compressor such that the compression refrigeration loop forms a circulation loop;
the defrosting circuit comprises a low-pressure stage compressor, an indoor heat exchanger group, a liquid storage device and a defrosting evaporator which are connected in sequence and are suitable for carbon dioxide working medium to flow through; the liquid storage device is also connected with the low-pressure stage compressor through a third pressure reduction structure so as to enable the gas-phase carbon dioxide working medium generated by separation from the liquid storage device to return to the low-pressure stage compressor; and the defrosting evaporator is also connected with the low-pressure stage compressor so that the liquid-phase carbon dioxide working medium separated and generated from the liquid storage device passes through the second pressure reduction structure and then is phase-changed into gas-phase carbon dioxide working medium through the defrosting evaporator and then returns to the low-pressure stage compressor.
In a preferred embodiment of the present invention, the first pressure reducing structure is disposed on a flow pipe between a heat regenerator and an indoor heat exchanger group of the compression refrigeration circuit; a first control valve is also arranged on a circulation pipeline between the heat regenerator and the indoor heat exchanger group of the compression refrigeration loop; wherein
The first control valve is arranged between the first pressure reduction structure and the heat regenerator.
In the preferred embodiment of the present invention, a second control valve is disposed on the flow line between the accumulator of the compression refrigeration circuit and the low-pressure stage compressor.
In a preferred embodiment of the present invention, a third control valve is disposed in a flow line between the low pressure stage compressor of the defrosting circuit and the indoor heat exchanger set.
In a preferred embodiment of the present invention, the second pressure reducing structure is disposed on a flow path between the reservoir of the defrosting circuit and the defrosting evaporator, and a fourth control valve is further disposed on the flow path between the reservoir of the defrosting circuit and the defrosting evaporator; wherein
And the fourth control valve is arranged between the second pressure reduction structure and the liquid storage device.
In a preferred embodiment of the present invention, the third pressure reducing structure is disposed on a flow path between the accumulator of the defrosting circuit and the low-pressure stage compressor, and a check valve is further disposed on the flow path between the accumulator of the defrosting circuit and the low-pressure stage compressor; wherein
The check valve is arranged between the third pressure reduction structure and the low-pressure stage compressor.
In a preferred embodiment of the present invention, the gas cooler group comprises at least one gas cooler; and
the indoor heat exchanger group comprises at least one indoor heat exchanger.
In a preferred embodiment of the present invention, the gas cooler group includes two or more gas coolers arranged in parallel.
In the preferred embodiment of the present invention, the indoor heat exchanger set includes two or more indoor heat exchangers connected in parallel.
The utility model discloses a transcritical carbon dioxide doublestage compression refrigeration and defrost system's application method realizes like this:
the utility model has the advantages that: the utility model discloses a transcritical carbon dioxide doublestage compression refrigeration and defrost system utilizes the lower advantage of low-pressure lateral pressure in the structure to the compression refrigeration return circuit of transcritical carbon dioxide working medium doublestage compression, can improve the security of system's defrosting process, and the effect of increasing enthalpy through the tonifying qi of defrosting return circuit in addition can strengthen the defrosting performance in defrosting return circuit, can also reduce the energy consumption when improving defrosting efficiency.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the overall structure of the transcritical carbon dioxide dual-stage compression refrigeration and defrosting system of the present invention.
In the figure: the system comprises a high-pressure stage compressor 1, a gas cooler 2, a heat regenerator 3, a first control valve 4, a first pressure reduction structure 5, an indoor heat exchanger 6, a liquid accumulator 7, a second control valve 8, a low-pressure stage compressor 9, a third control valve 10, a third pressure reduction structure 11, a check valve 12, a fourth control valve 13, a second pressure reduction structure 14 and a defrosting evaporator 15.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the present embodiment provides a transcritical carbon dioxide two-stage compression refrigeration and defrosting system, which is suitable for refrigeration industry such as freezing, cold chain or cold storage. The method specifically comprises the following steps: the defrosting circuit is suitable for a compression refrigeration circuit for performing double-stage compression on carbon dioxide working media and an indoor heat exchanger of a refrigeration system to defrost.
In detail, the compression refrigeration loop comprises a high-pressure stage compressor 1, an air cooler group, a heat regenerator 3, a first pressure reduction structure 5, an indoor heat exchanger group, a liquid storage device 7 and a low-pressure stage compressor 9 which are connected in sequence and are suitable for carbon dioxide working medium circulation; wherein the low pressure stage compressor 9 is also connected to the regenerator 3 and the regenerator 3 is connected to the high pressure stage compressor 1 so that the compression refrigeration loop forms a circulation loop.
The defrosting loop comprises a low-pressure stage compressor 9, an indoor heat exchanger group, a liquid storage device 7 and a defrosting evaporator 15 which are connected in sequence and are suitable for carbon dioxide working medium to flow through; the liquid storage device 7 is also connected with the low-pressure stage compressor 9 through a third pressure reduction structure 11 so that the gas-phase carbon dioxide working medium generated by separation from the liquid storage device 7 returns to the low-pressure stage compressor 9; and the defrosting evaporator 15 is also connected with the low-pressure stage compressor 9 so that the liquid-phase carbon dioxide working medium separated and generated from the liquid storage device 7 passes through the second pressure reduction structure 14, then is subjected to phase change through the defrosting evaporator 15 to be a gas-phase carbon dioxide working medium, and then returns to the low-pressure stage compressor 9.
For the low-pressure stage compressor 9 and the high-pressure stage compressor 1 according to the present embodiment, one of a centrifugal compressor and a positive displacement compressor may be used, for example, but not limited thereto.
To sum up, three device structures of a low-pressure stage compressor, an indoor heat exchanger group and a liquid storage device 7 are shared for the compression refrigeration loop and the defrosting loop, so that the advantage of low-pressure side pressure in the structure of the available compression refrigeration loop when the compression refrigeration loop of the embodiment is used for carrying out double-stage compression on the transcritical carbon dioxide working medium can be improved, the safety of the defrosting process of the system can be improved, in addition, the defrosting performance of the defrosting loop can be enhanced through the air supply and enthalpy increasing effect of the defrosting loop, the energy consumption can be reduced while the defrosting efficiency is improved, the cold demand of a user can be met, the frosting problem of the indoor heat exchanger can be solved quickly and efficiently, and the efficient and stable operation of the transcritical carbon dioxide double-stage compression refrigeration system can be.
The switching control for the above-described specific compression refrigeration circuit and defrost circuit is realized by:
firstly, a first pressure reduction structure 5 is arranged on a circulation pipeline between a heat regenerator 3 of a compression refrigeration loop and an indoor heat exchanger group, and a first control valve 4 is arranged on the circulation pipeline in the sea; wherein the first control valve is arranged between the first pressure reducing structure 5 and the regenerator 3. A second control valve 8 is arranged on a flow pipeline between the liquid accumulator 7 and the low-pressure stage compressor 9 of the compression refrigeration circuit.
Secondly, a third control valve 10 is provided in the flow line between the low pressure stage compressor 9 and the indoor heat exchanger group of the defrost circuit. The second pressure reduction structure 14 is arranged on a circulation pipeline between the liquid reservoir 7 and the defrosting evaporator 15 of the defrosting circuit, and a fourth control valve 13 is also arranged on the circulation pipeline; wherein the fourth control valve 13 is arranged between the second pressure reducing structure 14 and the reservoir 7.
Thirdly, the third pressure reduction structure 11 is arranged on a circulation pipeline between the liquid accumulator 7 and the low-pressure stage compressor 9 of the defrosting circuit, and a one-way valve 12 is also arranged on the circulation pipeline; wherein the non-return valve 12 is provided between the third pressure reducing structure 11 and the low pressure stage compressor 9.
It should be further noted that, for example, but not limited to, an expansion valve and an expansion machine can be adopted for the first pressure reducing structure 5, the second pressure reducing structure 14 and the third pressure reducing structure 11 of the present embodiment to perform the pressure reducing function. Specifically, an expansion valve, an expansion machine or other similar structures are adopted, and this embodiment is not limited in any way.
In practical use, when the compression refrigeration circuit needs to be operated, specifically, the third control valve 10 and the fourth control valve 13 on the defrosting circuit are closed, and the first control valve 4 and the second control valve 8 on the compression refrigeration circuit are opened at the same time. When the defrosting circuit needs to be operated, the first control valve 4 and the second control valve 8 on the compression refrigeration circuit are closed, and the third control valve 10 and the fourth control valve 13 on the defrosting circuit are opened at the same time.
It should be noted that, for the gas cooler group of the present embodiment, at least one gas cooler 2 is included; and the indoor heat exchanger group comprises at least one indoor heat exchanger 6. Here, only one gas cooler 2 and one indoor heat exchanger 6 are taken as examples in conjunction with the drawings of the present embodiment. In fact, the structure can be a plurality of structures according to the actual situation. When the number of the air cooler groups and the number of the indoor heat exchanger groups are more than one, that is, two or more than two, the two or more than two gas coolers 2 are connected in parallel, and the two or more than two indoor heat exchangers 6 are connected in parallel.
The specific use of the transcritical carbon dioxide two-stage compression refrigeration and defrost system of the present embodiment includes two loop processes: specifically a compression refrigeration circuit operation and a defrost circuit operation.
For the operation of the compression refrigeration loop, the third control valve 10 and the fourth control valve 13 on the defrosting loop are closed, and the first control valve 4 and the second control valve 8 on the compression refrigeration loop are simultaneously opened, so that the carbon dioxide working medium in the system enters the air cooler group through the high-pressure stage compressor 1 for cooling and then is subjected to heat exchange through the heat regenerator 3, and enters the indoor heat exchanger 6 for phase change absorption of indoor heat after throttling and pressure reduction through the first pressure reduction structure 5, the gas-phase or two-phase carbon dioxide working medium after phase change enters the liquid reservoir 7 for gas-liquid separation, and the separated gas-phase carbon dioxide working medium returns to the low-pressure stage compressor 9 to complete the cycle process of two-stage compression of the carbon dioxide working medium.
The defrosting loop operates, the first control valve 4 and the second control valve 8 on the compression refrigeration loop are closed, the third control valve 10 and the fourth control valve 13 on the defrosting loop are opened simultaneously, so that carbon dioxide working media in the system enter the indoor heat exchanger 6 for heat release and defrosting after being compressed by the low-pressure stage compressor 9, the carbon dioxide working media cooled by the indoor heat exchanger 6 enter the liquid storage device 7 for gas-liquid separation, and the gas-phase carbon dioxide working media subjected to gas-liquid separation by the liquid storage device 7 directly enter the compression cavity of the low-pressure stage compressor 9 through the third pressure reduction structure 11 and the one-way valve 12 for air supplement and enthalpy increase to improve defrosting performance. And the liquid-phase carbon dioxide working medium separated from the liquid storage device 7 enters the defrosting evaporator 15 through the fourth control valve 13 and the second pressure reduction structure 14 to be changed into a gas-phase carbon dioxide working medium after phase change and heat absorption, and then the gas-phase carbon dioxide working medium returns to the low-pressure stage compressor 9, so that the defrosting cycle process is completed.
In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A transcritical carbon dioxide dual stage compression refrigeration and defrost system, comprising:
the system comprises a compression refrigeration loop, a heat exchanger and a heat exchanger, wherein the compression refrigeration loop comprises a high-pressure stage compressor, an air cooler group, a heat regenerator, a first pressure reduction structure, an indoor heat exchanger group, a liquid storage device and a low-pressure stage compressor which are sequentially connected and are suitable for carbon dioxide working medium circulation; wherein the low pressure stage compressor is further connected to the regenerator and the regenerator is connected to the high pressure stage compressor such that the compression refrigeration loop forms a circulation loop;
the defrosting circuit comprises a low-pressure stage compressor, an indoor heat exchanger group, a liquid storage device and a defrosting evaporator which are connected in sequence and are suitable for carbon dioxide working medium to flow through; the liquid storage device is also connected with the low-pressure stage compressor through a third pressure reduction structure so as to enable the gas-phase carbon dioxide working medium generated by separation from the liquid storage device to return to the low-pressure stage compressor; and the defrosting evaporator is also connected with the low-pressure stage compressor so that the liquid-phase carbon dioxide working medium separated and generated from the liquid storage device passes through the second pressure reduction structure and then is phase-changed into gas-phase carbon dioxide working medium through the defrosting evaporator and then returns to the low-pressure stage compressor.
2. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 1 wherein said first pressure reducing structure is disposed on a flow path between a regenerator and an indoor heat exchanger bank of said compression refrigeration circuit; a first control valve is also arranged on a circulation pipeline between the heat regenerator and the indoor heat exchanger group of the compression refrigeration loop; wherein
The first control valve is arranged between the first pressure reduction structure and the heat regenerator.
3. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 2 wherein a second control valve is provided in the flow line between the accumulator and the low pressure stage compressor of said compression refrigeration circuit.
4. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 1 wherein a third control valve is provided in the flow line between the low pressure stage compressor and the indoor heat exchanger set of said defrost circuit.
5. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 4 wherein said second pressure reducing structure is disposed on a flow path between said defrost circuit reservoir and defrost evaporator, and a fourth control valve is further disposed on said flow path between said defrost circuit reservoir and defrost evaporator; wherein
And the fourth control valve is arranged between the second pressure reduction structure and the liquid storage device.
6. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 5, wherein said third pressure reducing structure is disposed on a flow path between the accumulator and the low pressure stage compressor of said defrost circuit, and a check valve is further disposed on the flow path between the accumulator and the low pressure stage compressor of said defrost circuit; wherein
The check valve is arranged between the third pressure reduction structure and the low-pressure stage compressor.
7. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of any of claims 1-6, wherein said gas cooler bank includes at least one gas cooler; and
the indoor heat exchanger group comprises at least one indoor heat exchanger.
8. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 7 wherein said gas cooler bank includes two or more gas coolers arranged in parallel.
9. The transcritical carbon dioxide dual stage compression refrigeration and defrost system of claim 7 wherein said indoor heat exchanger bank includes two or more indoor heat exchangers arranged in parallel.
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| CN202020158011.3U CN211451439U (en) | 2020-02-09 | 2020-02-09 | Transcritical carbon dioxide two-stage compression refrigeration and defrosting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111174455A (en) * | 2020-02-09 | 2020-05-19 | 中科碳冷(无锡)高科技有限公司 | Transcritical carbon dioxide two-stage compression refrigeration and defrosting system and using method thereof |
| CN113074474A (en) * | 2021-04-12 | 2021-07-06 | 长虹美菱股份有限公司 | Intermediate liquid collection energy storage evaporator and efficient refrigerating system thereof |
-
2020
- 2020-02-09 CN CN202020158011.3U patent/CN211451439U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111174455A (en) * | 2020-02-09 | 2020-05-19 | 中科碳冷(无锡)高科技有限公司 | Transcritical carbon dioxide two-stage compression refrigeration and defrosting system and using method thereof |
| CN111174455B (en) * | 2020-02-09 | 2023-10-03 | 中科碳冷(无锡)高科技有限公司 | Transcritical carbon dioxide double-stage compression refrigeration and defrosting system and application method thereof |
| CN113074474A (en) * | 2021-04-12 | 2021-07-06 | 长虹美菱股份有限公司 | Intermediate liquid collection energy storage evaporator and efficient refrigerating system thereof |
| CN113074474B (en) * | 2021-04-12 | 2022-06-07 | 长虹美菱股份有限公司 | Intermediate liquid collection energy storage evaporator and efficient refrigerating system thereof |
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