CN216409349U

CN216409349U - Heat pump

Info

Publication number: CN216409349U
Application number: CN202123088325.4U
Authority: CN
Inventors: 柳晓丹; 史佩琦; 邹海伟; 柳杉; 佐藤裕一
Original assignee: Ebara Refrigeration Equipment and Systems China Co Ltd
Current assignee: Ebara Refrigeration Equipment and Systems China Co Ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-04-29
Anticipated expiration: 2031-12-09

Abstract

The utility model discloses a heat pump, which comprises an evaporator, a compressor unit, a condenser and a throttling component which are connected in series, wherein the compressor unit comprises a plurality of compressors connected in series, an economizer group is arranged between the condenser and the evaporator, and the economizer group is at least used for supplying air for one compressor in the compressor unit. So set up, can improve compressor unit's efficiency, and then guarantee higher refrigerating output or heating capacity. Meanwhile, a bypass pipeline capable of bypassing each compressor in the compressor unit is also configured in the heat pump, in specific practice, the number of the compressors put into use can be selected through the on-off of the bypass pipeline, and the compressors are adjusted to different compressors for air supplement through an economizer group so as to adapt to different working conditions; when all the compressors are put into use, hot water with higher temperature can be efficiently prepared; when only one compressor is put into use, the heat pump can be used for refrigeration or other low and medium temperature working conditions.

Description

Heat pump

Technical Field

The utility model relates to the technical field of heat exchange, in particular to a heat pump.

Background

Generally, a heat pump may include a compressor, a condenser, an evaporator, a throttle unit, and the like, in which a refrigerant may be circulated to produce heat or cold for the outside. However, the existing heat pump has limited water temperature raising capability, and is difficult to meet the current market demand.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heat pump which can ensure higher efficiency and larger refrigerating capacity or heating capacity.

In order to solve the technical problem, the utility model provides a heat pump which comprises an evaporator, a compressor unit, a condenser and a throttling component which are connected in series, wherein the compressor unit comprises a plurality of compressors connected in series, an economizer group is arranged between the condenser and the evaporator, and the economizer group is at least used for supplying air for one compressor in the compressor unit.

According to the arrangement, the heat pump provided by the utility model adopts a plurality of compressors and is also provided with the economizer group, so that air can be supplied to at least one compressor, the efficiency of the compressor unit can be improved, and higher refrigerating capacity or heating capacity can be further ensured.

Optionally, the compressor train comprises a first compressor and a second compressor in series, and the second compressor is located downstream of the first compressor; the economizer group comprises a first economizer, the first compressor and the second compressor are connected through a first pipeline, and an air outlet of the first economizer is communicated with the first pipeline between the first compressor and the second compressor.

Optionally, at least one of the first compressor and the second compressor is a dual stage compressor.

Optionally, the first compressor is a two-stage compressor, a first air supplement pipeline and a second air supplement pipeline which are connected in parallel are arranged at an air outlet of the first economizer, the first air supplement pipeline is communicated with the first pipeline, the first air supplement pipeline is provided with a first air supplement switching valve, the second air supplement pipeline is communicated with a middle air supplement port of the first compressor, and the second air supplement pipeline is provided with a second air supplement switching valve; the compressor further comprises a first bypass pipeline communicated with the upstream side and the downstream side of the second compressor, and the first bypass pipeline is provided with a first bypass switch valve.

Optionally, the second compressor is a two-stage compressor, a first air supplement pipeline and a third air supplement pipeline which are connected in parallel are arranged at an air outlet of the first economizer, the first air supplement pipeline is communicated with the first pipeline, the first air supplement pipeline is provided with a first air supplement switching valve, the third air supplement pipeline is communicated with a middle air supplement port of the second compressor, and the third air supplement pipeline is further provided with a third air supplement switching valve; the compressor further comprises a second bypass pipeline communicated with the upstream side and the downstream side of the first compressor, and the second bypass pipeline is provided with a second bypass switch valve.

Optionally, the first compressor is a two-stage compressor, the economizer group further includes a second economizer, the second economizer is disposed between the first economizer and the evaporator, and a gas outlet of the second economizer is communicated with a middle gas supplementing port of the first compressor.

Optionally, the second compressor is a two-stage compressor, the economizer group further comprises a third economizer, the third economizer is arranged between the condenser and the first economizer, and an air outlet of the third economizer is communicated with a middle air supplement port of the second compressor.

Optionally, the system further comprises a first bypass line communicated with the upstream side and the downstream side of the second compressor, the first bypass line being provided with a first bypass switching valve; the condenser is characterized by further comprising a third bypass pipeline provided with a third bypass switch valve, one end of the third bypass pipeline is communicated with a pipeline between the condenser and the third economizer, and the other end of the third bypass pipeline is communicated with a pipeline between the first economizer and the second economizer.

Optionally, the system further comprises a second bypass pipeline communicated with the upstream side and the downstream side of the first compressor, and the second bypass pipeline is provided with a second bypass switch valve; the evaporator is characterized by further comprising a fourth bypass pipeline provided with a fourth bypass switch valve, one end of the fourth bypass pipeline is communicated with a pipeline between the third economizer and the first economizer, and the other end of the fourth bypass pipeline is further communicated with a pipeline between the second economizer and the evaporator.

Optionally, the upstream side and the downstream side of the first economizer, the upstream side and the downstream side of the second economizer, and the upstream side and the downstream side of the third economizer are provided with throttling parts.

Optionally, the first compressor and the second compressor are both configured with an inverter.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a heat pump according to the present invention;

FIG. 2 is a diagram of the cycle pressure enthalpy of the heat pump of FIG. 1 during actual use;

FIG. 3 is a schematic structural view of another embodiment of the heat pump of the present invention;

fig. 4 is a diagram of the circulation pressure enthalpy of the heat pump provided in fig. 3 during actual use.

The reference numerals in fig. 1-4 are illustrated as follows:

100 evaporator, 101 first compressor, 102 second compressor, 103 condenser, 104 first economizer, 105 first air make-up switch valve, 106 second air make-up switch valve, 107 first bypass switch valve, 108 third air make-up switch valve, 109 second bypass switch valve, 110 second economizer, 111 third economizer, 112 third bypass switch valve, 113 fourth bypass switch valve, 114 throttling component, 115 first switch valve, 116 second switch valve, 117 third switch valve;

200 a first line, 201 a first gas supplement line, 202 a second gas supplement line, 203 a first bypass line, 204 a third gas supplement line, 205 a second bypass line, 206 a third bypass line, 207 a fourth bypass line.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

The terms "first," "second," and the like, herein are used for convenience in describing two or more structures or components that are identical or similar in structure and/or function and do not denote any particular limitation in order and/or importance.

Referring to fig. 1-4, fig. 1 is a schematic structural diagram of an embodiment of a heat pump of the present invention, fig. 2 is a schematic structural diagram of a circulating pressure enthalpy diagram of the heat pump of fig. 1 during actual use, fig. 3 is a schematic structural diagram of another embodiment of the heat pump of the present invention, and fig. 4 is a schematic structural diagram of the heat pump of fig. 3 during actual use.

The heat pump aims at solving the problem that the prior heat pump can produce less cold or heat. The embodiment of the utility model provides a heat pump, which comprises an evaporator 100, a compressor unit and a condenser 103 which are connected in series, wherein the compressor unit comprises a plurality of compressors connected in series, the number of the compressors is uncertain, and the number of the compressors is usually two or more; an economizer bank is also provided between the condenser 103 and the evaporator 100 for flashing a portion of the refrigerant liquid delivered from the condenser 103 to form a refrigerant gas for use in charging at least one compressor.

In such a configuration, the heat pump provided by the embodiment of the utility model adopts a plurality of compressors and is also provided with the economizer group, so that air can be supplied to at least one compressor, the efficiency of the compressor unit can be improved, and higher refrigerating capacity or heating capacity can be further ensured.

Here, the number of compressors included in the compressor group and the number of economizers included in the economizer group are not limited in the embodiments of the present invention, and in the specific implementation, those skilled in the art may configure the compressors and the economizers according to actual needs. In the following embodiments of the present invention, a compressor unit is exemplified to include two compressors, and for convenience of description, the two compressors may be referred to as a first compressor 101 and a second compressor 102, respectively.

As shown in fig. 1 and 2, the present invention provides a heat pump, comprising an evaporator 100, a first compressor 101, a second compressor 102 and a condenser 103 connected in series, wherein the economizer group may comprise a first economizer 104, the first economizer 104 may be disposed between the condenser 103 and the evaporator 100, the first compressor 101 and the second compressor 102 are connected by a first pipeline 200, and an outlet of the first economizer 104 is communicated with the first pipeline 200.

By adopting the scheme, the heat pump provided by the embodiment of the utility model adopts two compressors connected in series, the first economizer 104 can also flash a part of the refrigerant conveyed by the condenser 103 to form refrigerant gas, and the refrigerant gas can be supplemented from the inlet side of the second compressor 102, so that the efficiency of the second compressor 102 can be improved, and higher refrigerating capacity or heating capacity can be ensured.

Moreover, the heat pump only adopts the first economizer 104, so that the structure is simple, and the cost is favorably controlled.

Further, at least one of the first compressor 101 and the second compressor 102 may be a two-stage compressor to increase the cooling capacity or the heating capacity and the system efficiency to a greater extent.

Taking the first compressor 101 as a two-stage compressor as an example, in this case, the first compressor 101 may be configured with an intermediate air supplement port to improve the efficiency of the first compressor 101.

In detail, as shown in fig. 1, the air outlet of the first economizer 104 may be provided with a first air supplement pipeline 201 and a second air supplement pipeline 202 connected in parallel; the first air supplement pipeline 201 may be in communication with the first pipeline 200 for supplementing air to the inlet side of the second compressor 102, and the first air supplement pipeline 201 may be provided with a first air supplement switching valve 105; the second air supplement pipeline 202 can be communicated with the middle air supplement port of the first compressor 101 and used for supplementing air for the first compressor 101, and the second air supplement pipeline 202 is provided with a second air supplement switching valve 106; a first bypass line 203 communicating with the upstream side and the downstream side of the second compressor 102 may be further included, and the first bypass line 203 may be provided with a first bypass switching valve 107.

So configured, in a specific practice, the second compressor 102 may be bypassed by the operation of opening the first bypass on-off valve 107 and the second make-up air on-off valve 106, and closing the first make-up air on-off valve 105, so as to realize the independent operation of the first compressor 101 and the intermediate make-up air for the first compressor 101, and further, the efficiency of the first compressor 101 may be improved.

That is, although the embodiment of the present invention provides a solution including two compressors, with the above structural design, in a specific practice, the first compressor 101 can be used alone to meet different working conditions. More importantly, even if the first compressor 101 is used alone, the first economizer 104 can be used to supplement air to the first compressor 101 to improve the efficiency of the first compressor 101, so as to ensure the cooling capacity or the heating capacity. It should be noted that when only the first compressor 101 is used, the compressor can be used in a cooling mode or other low-medium temperature heating mode.

When the first compressor 101 is a two-stage compressor and the first compressor 101 and the second compressor 102 are used synchronously, the first compressor 101 is provided with intermediate air make-up, and the air suction amount of the second compressor 102 can be increased.

Similarly, when the second compressor 102 is a two-stage compressor, the gas outlet of the first economizer 104 may be further connected in parallel with a third gas supplementing pipeline 204, the third gas supplementing pipeline 204 may be communicated with the middle gas supplementing port of the second compressor 102, and the third gas supplementing pipeline 204 may be further provided with a third gas supplementing switching valve 108; a second bypass line 205 communicating with the upstream side and the downstream side of the first compressor 101 may be further included, and the second bypass line 205 may be provided with a second bypass switching valve 109.

With the above-described structure, in a specific practice, the first compressor 101 can be bypassed by the operations of opening the second bypass on-off valve 109 and the third air make-up on-off valve 108 and closing the first air make-up on-off valve 105 and the second air make-up on-off valve 106, and at the same time, the intermediate air make-up for the second compressor 102 is realized, so that the efficiency of the second compressor 102 can be improved. In this way, a separate use of the second compressor 102 can be achieved; in addition, the second compressor 102 has middle air supplement, so that the efficiency is higher, and the refrigerating capacity or the heating capacity can be ensured.

Here, the embodiment of the present invention does not limit whether the heat pump provided with only one first economizer 104 shown in fig. 1 is used for cooling or heating, and in particular, a person skilled in the art can select the heat pump according to actual needs. As an exemplary illustration, when the first compressor 101 and the second compressor 102 are both put into use, the heat pump can be used for heating to efficiently produce hot water with higher temperature and larger heat; when the first compressor 101 and the second compressor 102 are used independently, the air conditioner can be used in a refrigeration working condition or other low-medium temperature heating working conditions.

Further, as shown in fig. 3, when the first compressor 101 is a two-stage compressor, the economizer group may further include a second economizer 110, the second economizer 110 may be disposed between the first economizer 104 and the evaporator 100, and an air outlet of the second economizer 110 may be in communication with the middle air supplement port of the first compressor 101. In this way, the second economizer 110 can flash a portion of the refrigerant delivered from the first economizer 104 to form refrigerant gas, and can add the portion of the refrigerant gas from the intermediate make-up gas port of the first compressor 101, thereby improving the efficiency of the first compressor 101.

And, the second compressor 102 may also be a two-stage compressor, the economizer group may further include a third economizer 111, the third economizer 111 may be disposed between the condenser 103 and the first economizer 104, and an air outlet of the third economizer 111 may be communicated with an intermediate air supplement port of the second compressor 102. In this way, the third economizer 111 can flash a portion of the refrigerant liquid delivered from the condenser 103 to form refrigerant gas, and can feed the refrigerant gas from the intermediate make-up gas port of the second compressor 102, thereby improving the efficiency of the second compressor 102.

Thus, in the solution shown in fig. 3, the first compressor 101 and the second compressor 102 actually have four-stage compression and three-stage air supplement, which can greatly improve the efficiency. Taking the heat pump for heating as an example, the heat pump can raise the temperature of a heat source at 5 ℃ to about 95 ℃, and can greatly raise the temperature of hot water outlet; when the heat pump is used in a heat source tower, the temperature of the low-temperature heat source of-20 ℃ can be raised to about 65 ℃.

Similarly, the first compressor 101 and the second compressor 102 in the embodiment of fig. 3 may be used alternatively.

With continued reference to fig. 3, the heat pump according to the embodiment of the present invention may further include a first bypass line 203 communicated with the upstream side and the downstream side of the second compressor 102, and the first bypass line 203 may be provided with a first bypass switching valve 107; a third bypass line 206 provided with a third bypass switching valve 112 may be further included, and one end of the third bypass line 206 may communicate with a line between the condenser 103 and the third economizer 111, and the other end of the third bypass line 206 may communicate with a line between the first economizer 104 and the second economizer 110.

When the first bypass switching valve 107 is opened and the third bypass switching valve 112 is opened, the first bypass line 203 may bypass the second compressor 102, and the third bypass line 206 may bypass the first economizer 104 and the third economizer 111. Thus, only the first compressor 101 and the second economizer 110 participate in the cycle, and the second economizer 110 can perform intermediate air make-up for the first compressor 101 to ensure the efficiency of the first compressor 101; the second compressor 102, the first economizer 104, and the third economizer 111 do not participate in the operation.

Further, the heat pump according to the embodiment of the present invention may further include a second bypass line 205 communicating with the upstream side and the downstream side of the first compressor 101, and the second bypass line 205 may be provided with a second bypass switching valve 109; a fourth bypass line 207 provided with a fourth bypass switching valve 113 may be further included, and one end of the fourth bypass line 207 may communicate with a line between the third economizer 111 and the first economizer 104, and the other end of the fourth bypass line 207 may communicate with a line between the second economizer 110 and the evaporator 100.

When the second bypass switching valve 109 is opened and the fourth bypass switching valve 113 is opened, the second bypass line 205 may bypass the first compressor 101, and the fourth bypass line 207 may bypass the first economizer 104 and the second economizer 110. Thus, only the second compressor 102 and the third economizer 111 participate in the cycle, and the third economizer 111 can perform intermediate air make-up for the second compressor 102 to ensure the efficiency of the second compressor 102; the first compressor 101, the first economizer 104, and the second economizer 110 do not participate in the operation.

Further, a throttling part 114 may be provided at each of the upstream and downstream sides of the first economizer 104, the second economizer 110, and the third economizer 111 to perform throttling and depressurizing functions.

Here, the embodiment of the present invention does not limit whether the heat pump provided with three economizers shown in fig. 3 is used for cooling or heating, and in particular, in practice, a person skilled in the art can select the heat pump according to actual needs. As an exemplary illustration, when three economizers and two compressors are put into use, the heat pump provided by the embodiment of the present invention can be used for heating to ensure higher efficiency and sufficient heating amount; when only one economizer and one compressor are used, the heat pump provided by the embodiment of the utility model can be used for a refrigeration working condition or other low-medium temperature heating working conditions.

The line between the third economizer 111 and the first economizer 104 may be further provided with a first switching valve 115, the line between the first economizer 104 and the second economizer 110 may be further provided with a second switching valve 116, and the line between the second economizer 110 and the evaporator 100 may be further provided with a third switching valve 117. When the three economizers are put into use, the three switch valves can be in an open state; when the corresponding economizer is not in use, the corresponding switching valve may be closed, and for example, when the third bypass line 206 is turned on, the first switching valve 115 and the second switching valve 116 may be closed.

Further, both the first compressor 101 and the second compressor 102 may be configured with an inverter. When the temperature of the heat source water changes, the operation working condition and the optimal design working condition of the circulating heat exchange unit provided by the utility model may deviate, and the operation efficiency of the unit is reduced. At the moment, the rotating speed of the compressor can be changed in a frequency conversion mode, so that the operation efficiency of the unit is improved.

In specific practice, both the two compressors may be operated in a variable frequency mode, or only one of the two compressors may be operated in a variable frequency mode.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a heat pump, its characterized in that, includes evaporimeter (100), compressor unit, condenser (103) and throttle part (114) of establishing ties mutually, the compressor unit includes the compressor of a plurality of looks series connection, condenser (103) with still be provided with the economic ware group between evaporimeter (100), the economic ware group at least be used for one in the compressor unit the compressor carries out the tonifying qi.

2. The heat pump according to claim 1, wherein the compressor group comprises a first compressor (101) and a second compressor (102) in series, and the second compressor (102) is located downstream of the first compressor (101);

the economizer group comprises a first economizer (104), the first compressor (101) and the second compressor (102) are connected through a first pipeline (200), and an air outlet of the first economizer (104) is communicated with the first pipeline (200).

3. The heat pump of claim 2, wherein at least one of the first compressor (101) and the second compressor (102) is a dual-stage compressor.

4. The heat pump according to claim 3, characterized in that the first compressor (101) is a two-stage compressor, the air outlet of the first economizer (104) is provided with a first air supplement pipeline (201) and a second air supplement pipeline (202) which are connected in parallel, the first air supplement pipeline (201) is communicated with the first pipeline (200), the first air supplement pipeline (201) is provided with a first air supplement on-off valve (105), the second air supplement pipeline (202) is communicated with the middle air supplement port of the first compressor (101), and the second air supplement pipeline (202) is provided with a second air supplement on-off valve (106);

the compressor further comprises a first bypass pipeline (203) communicated with the upstream side and the downstream side of the second compressor (102), and the first bypass pipeline (203) is provided with a first bypass switch valve (107).

5. The heat pump according to claim 3, wherein the second compressor (102) is a two-stage compressor, the air outlet of the first economizer (104) is provided with a first air supplement pipeline (201) and a third air supplement pipeline (204) which are connected in parallel, the first air supplement pipeline (201) is communicated with the first pipeline (200), the first air supplement pipeline (201) is provided with a first air supplement on-off valve (105), the third air supplement pipeline (204) is communicated with the middle air supplement port of the second compressor (102), and the third air supplement pipeline (204) is further provided with a third air supplement on-off valve (108);

the compressor further comprises a second bypass pipeline (205) communicated with the upstream side and the downstream side of the first compressor (101), and the second bypass pipeline (205) is provided with a second bypass switch valve (109).

6. The heat pump of claim 3, wherein the first compressor (101) is a dual stage compressor, the economizer bank further comprising a second economizer (110), the second economizer (110) being disposed between the first economizer (104) and the evaporator (100), the outlet of the second economizer (110) being in communication with the intermediate make-up port of the first compressor (101).

7. The heat pump according to claim 6, wherein the second compressor (102) is a two-stage compressor, the economizer group further comprising a third economizer (111), the third economizer (111) being disposed between the condenser (103) and the first economizer (104), the outlet of the third economizer (111) being in communication with the intermediate make-up port of the second compressor (102).

8. The heat pump according to claim 7, further comprising a first bypass line (203) communicating with upstream and downstream sides of the second compressor (102), the first bypass line (203) being provided with a first bypass switching valve (107);

the condenser is characterized by further comprising a third bypass pipeline (206) provided with a third bypass switch valve (112), one end of the third bypass pipeline (206) is communicated with a pipeline between the condenser (103) and the third economizer (111), and the other end of the third bypass pipeline (206) is communicated with a pipeline between the first economizer (104) and the second economizer (110).

9. The heat pump according to claim 7, further comprising a second bypass line (205) communicating with an upstream side and a downstream side of the first compressor (101), the second bypass line (205) being provided with a second bypass switching valve (109);

the evaporator is characterized by further comprising a fourth bypass pipeline (207) provided with a fourth bypass switch valve (113), one end of the fourth bypass pipeline (207) is communicated with a pipeline between the third economizer (111) and the first economizer (104), and the other end of the fourth bypass pipeline (207) is also communicated with a pipeline between the second economizer (110) and the evaporator (100).

10. The heat pump according to claim 7, wherein the throttle member (114) is provided on each of an upstream side and a downstream side of the first economizer (104), an upstream side and a downstream side of the second economizer (110), and an upstream side and a downstream side of the third economizer (111).

11. The heat pump according to any one of claims 1-10, wherein each of said compressors is provided with an inverter.