CN102853580B9

CN102853580B9 - Air-conditioning refrigeration equipment

Info

Publication number: CN102853580B9
Application number: CN201110462200.5A
Authority: CN
Inventors: 刘雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-10-05
Filing date: 2011-12-18
Publication date: 2020-06-12
Anticipated expiration: 2031-12-18
Also published as: CN102853580A; CN102853580B

Abstract

The invention discloses an air-conditioning refrigeration device, which comprises a compression mechanism, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first throttling mechanism, a second throttling mechanism, a first one-way valve and a second one-way valve, wherein the four-way valve is arranged on the compression mechanism; the high-pressure node of the four-way valve is connected with the outlet end of the compression mechanism, the low-pressure node of the four-way valve is connected with the inlet end of the compression mechanism, any one of two reversing nodes of the four-way valve is connected with the other reversing node of the four-way valve sequentially through the outlet end of the first one-way valve, the inlet end of the first one-way valve, the first heat exchanger, the first throttling mechanism, the inlet end of the second one-way valve and the outlet end of the second one-way valve, one end of the second heat exchanger is connected with a pipeline between the inlet ends of the first throttling mechanism and the second one-way valve, and the other end of the second. Simple structure, reliable operation and low cost, and can realize multiple functions of refrigeration, heating, hot water production and the like.

Description

Air-conditioning refrigeration equipment

Technical Field

The invention relates to an air conditioner refrigeration device, and belongs to the technical field of refrigeration.

Background

The conventional air-conditioning and refrigerating equipment for winter and summer consists of a compression mechanism, a four-way reversing mechanism, a heat source side heat exchanger, a user side heat exchanger and a throttling mechanism, when the equipment is used for refrigerating in summer, the user side heat exchanger is used for cooling indoor air or producing chilled water, and condensation heat generated by refrigeration is discharged into the environment (such as outdoor air, surface water, underground water or soil and the like) through the heat source side heat exchanger; when the heat exchanger is used for heating in winter, the heat source side heat exchanger is used for absorbing heat from the environment, and then the user side heat exchanger is used for producing hot water or heating indoor air. As is known, the air conditioning and refrigerating equipment can only meet the single requirement of refrigeration or heating when in work, and cannot meet the requirements of refrigeration, heating and domestic hot water of users in the process of operating all year round.

Disclosure of Invention

The invention aims to provide air-conditioning refrigeration equipment which can meet the requirements of refrigeration, heating and domestic hot water of users in the process of running all year round.

In order to overcome the problems of the prior art, the technical scheme for solving the technical problems is as follows:

1. the utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a second throttling mechanism (7), a third heat exchanger (8), a first one-way valve (21) and a second one-way valve (22); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-sixth pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63), any node (74) of two reversing nodes of the four-way valve (2) is sequentially connected with a sixty-fourteen pipeline (64), the outlet end of the second one-way valve (22), the inlet end of the second one-way valve (22), a seventy pipeline (70), the second heat exchanger (4), the second throttling mechanism (7), a sixty-eight pipeline (68), the third heat exchanger (8) and a fifty-ninth pipeline (59) between the high-pressure node (71) of the four-way valve (2) and the outlet end of the compression mechanism (1), one end of the first throttling mechanism (5) is connected with a seventy-seventh pipeline (60) between the inlet end of the second one-way valve (22) and the second one-way valve (4) The other end of the first throttling mechanism (5) is connected with the other reversing node (72) of the four-way valve (2) through a first heat exchanger (3), the inlet end of a first one-way valve (21), the outlet end of the first one-way valve (21) and a sixty-first pipeline (61) in sequence.

2. The utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a second throttling mechanism (7), a third heat exchanger (8), a second one-way valve (22), a fourth one-way valve (24) and a fifth one-way valve (25); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-fourth pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63) in sequence, any node (72) of two reversing nodes of the four-way valve (2) is connected with a sixty-third pipeline (63) between the inlet end of the compression mechanism (1) and the low-pressure node (73) of the four-way valve (2) through a sixty-fourth pipeline (64), the inlet end of the fourth one-way valve (24) in sequence, a sixty-fourth pipeline (63), a fifth one-way valve (25), an inlet end of the fifth one-way valve (25), a sixty-sixth pipeline (66), a first throttling mechanism (5), a first heat exchanger (3) and a sixty-fifth pipeline (65), and the other reversing, The outlet end of a fourth check valve (24), a fifty-ninth pipeline (59), a third heat exchanger (8), a sixty-eight pipeline (68), a second throttling mechanism (7), a second heat exchanger (4) and a seventy pipeline (70) are connected with a sixty-six pipeline (66) between the inlet ends of the first throttling mechanism (5) and the fifth check valve (25), the inlet end of the second check valve (22) is connected with a sixty-first pipeline (61) between the outlet end of the fifth check valve (25) and a reversing node of the four-way valve (2), and the outlet end of the second check valve (22) is connected with a fifty-ninth pipeline (59) between the outlet end of the fourth check valve (24) and the third heat exchanger (8).

3. The utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a second throttling mechanism (7), a third throttling mechanism (6), a third heat exchanger (8), a first one-way valve (21) and a second one-way valve (22); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-th pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63), any one node (74) of two reversing nodes of the four-way valve (2) is connected with the other reversing node (72) of the four-way valve (2) through a sixty-fourth pipeline (64), a second heat exchanger (4), a third throttling mechanism (6), a fifty-seventh pipeline (57), a fifty-second pipeline (52), a second throttling mechanism (7), a third heat exchanger (8), a fifty-first pipeline (51), the outlet end of the first check valve (21), the inlet end of the first check valve (21) and a sixty-first pipeline (61) in sequence, the inlet end of the second check valve (22) is connected with the sixty-fourth pipeline (64) through a sixty-second, the outlet end of the second check valve (22) is connected with a fifty-first pipeline (51) between the outlet end of the first check valve (21) and the third heat exchanger (8), one end of the first heat exchanger (3) is connected with a sixty-third pipeline (63) between the inlet end of the compression mechanism (1) and a low-pressure node (73) of the four-way valve (2) through a sixty-fifth pipeline (65), and the other end of the first heat exchanger (3) is connected with a pipeline between the second throttling mechanism (7) and the third throttling mechanism (6) through a fifty-eighth pipeline (58) and a first throttling mechanism (5) in sequence.

4. The utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a third throttling mechanism (6), a third heat exchanger (8) and a first one-way valve (21); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-fourth pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63), any node (74) of two reversing nodes of the four-way valve (2) is sequentially connected with a sixty-fourteen pipeline (64), the second heat exchanger (4), the third throttling mechanism (6), a sixty-seventh pipeline (67), a seventy-fourth pipeline (70), the first throttling mechanism (5), the first heat exchanger (3) and a sixty-fifth pipeline (65) between the inlet end of the compression mechanism (1) and the low-pressure node (73) of the four-way valve (2), the inlet end of the third heat exchanger (8) is connected with the sixty-third pipeline (60) between the outlet end of the compression mechanism (1) and the high-pressure node (71) of the four-way valve (2) through a fifty-ninth pipeline ( And the outlet end of the first heat exchanger (3) is connected with a pipeline between the first throttling mechanism (5) and the third throttling mechanism (6) through a sixteenth pipeline (66), the inlet end of the first one-way valve (21) is connected with the other reversing node (72) of the four-way valve (2) through a sixteenth pipeline (61), and the outlet end of the first one-way valve (21) is connected with the inlet end of the third heat exchanger (8) through a pipeline.

Compared with the prior art, the invention has the beneficial effects that:

1. in the operation process, multiple functions can be realized according to needs, and hot water, refrigeration and heating are produced;

2. the condensation heat generated in the operation process of the air-conditioning refrigeration equipment can be recycled;

3. the structure is simple, the work is reliable, and the cost is low;

4. the invention is suitable for industrial and civil air-conditioning refrigeration equipment, and is particularly suitable for occasions with refrigeration, heating and domestic hot water requirements.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural view of example 2 of the present invention;

FIG. 3 is a schematic structural diagram of example 3 of the present invention;

FIG. 4 is a schematic structural diagram of example 4 of the present invention;

FIG. 5 is a schematic structural view of example 5 of the present invention;

FIG. 6 is a schematic structural view of example 6 of the present invention;

FIG. 7 is a schematic structural view of example 8 of the present invention;

FIG. 8 is a schematic structural view of example 9 of the present invention;

fig. 9 is a schematic diagram of the hot water heating system of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

As shown in fig. 1, the present embodiment is a multifunctional air-conditioning and refrigerating apparatus, which is used in the occasions with the requirements of refrigeration, heating and hot water all year round. The whole equipment comprises the following components: the system comprises a compression mechanism 1, a four-way valve 2, a first throttling mechanism 5, a second throttling mechanism 7, a first one-way valve 21, a second one-way valve 22, a first heat exchanger 3, a second heat exchanger 4 and a third heat exchanger 8; the first throttling mechanism 5 and the second throttling mechanism 7 are electronic expansion valves; the first heat exchanger 3 is an evaporator, and is used for producing chilled water for refrigeration of users, and any one of a positive displacement heat exchanger, a shell-and-tube heat exchanger, a double-pipe heat exchanger or a plate heat exchanger is usually adopted; the second heat exchanger 4 is a heat source side heat exchanger, and can be used as a condenser for radiating condensation heat generated by refrigeration to the environment, and can also be used as an evaporator for absorbing heat from the environment; the third heat exchanger 8 is a hot water heater, and produces hot water for users all year round, and as shown in fig. 9, the hot water produced by the third heat exchanger 8 is used for heating domestic hot water (produced by the domestic hot water heater 30) on the one hand and for heating (shown in fig. 9, 40 is a heating system and 50 is a circulating water pump) on the other hand, and the amount of heating between heating and producing domestic hot water is adjusted by the electric three-way valve 80 in winter. The air-conditioning refrigeration equipment can realize multiple functions, and the working flows under the functions are respectively as follows.

(1) Refrigeration and heat recovery

Under the function, the third heat exchanger 8 utilizes part of condensation heat generated by refrigeration to produce hot water, the other part of condensation heat is discharged into the environment through the second heat exchanger 4, and the first heat exchanger 3 supplies cold for users; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 74.

When the throttle valve works, the first throttling mechanism 5 works normally, and the second throttling mechanism 7 is opened fully. The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant passes through a sixty-th pipe 60, a fifty-ninth pipe 59, a third heat exchanger 8, a sixty-eighth pipe 68, a second throttle mechanism 7, a second heat exchanger 4, a seventy-fourth pipe 70, a sixty-sixth pipe 66, a first throttle mechanism 5, a first heat exchanger 3, a first check valve 21, a sixty-first pipe 61, a four-way valve 2 reversing node 72, a four-way valve 2 low-pressure node 73, and a sixty-third pipe 63 in this order, and returns to the inlet end of the compression mechanism 1.

(2) Producing hot water separately

In this function, the second heat exchanger 4 extracts heat from the environment and hot water is produced in the third heat exchanger 8 by means of the extracted heat. The first heat exchanger 3 is not operated.

When the device works, the first throttling mechanism 5 is fully opened, and the second throttling mechanism 7 works normally; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant passes through a sixty-th pipe 60, a fifty-ninth pipe 59, a third heat exchanger 8, a sixty-eighth pipe 68, a second throttle mechanism 7, a second heat exchanger 4, a seventy-th pipe 70, a second check valve 22, a sixty-fourth pipe 64, a four-way valve 2 reversing node 74, a four-way valve 2 low-pressure node 73, and a sixty-third pipe 63 in this order, and returns to the inlet end of the compression mechanism 1.

(3) Defrosting in winter

During defrosting in winter, the working process is the same as the refrigeration and heat recovery functions.

Example 2

As shown in fig. 2, the present embodiment is also a multifunctional air-conditioning and cooling device, which is used in the occasions with the requirements of cooling, heating and hot water all year round. The difference from embodiment 1 is that a flow direction control valve 41, a third check valve 23 and a sixty-five pipe 65 are added to the system.

The flow direction control valve 41, the third check valve 23 and the sixty-fifth pipeline 65 are connected in the system in the following way: the inlet end of the third one-way valve 23 is connected with a seventeenth pipeline 70 through a sixteenth pipeline 66, and the outlet end of the third one-way valve 23 is connected with the first heat exchanger 3 through a first throttling mechanism 5; one end of the flow direction control valve 41 is connected with a sixty-eight pipeline 68 between the third heat exchanger 8 and the second throttling mechanism 7 through a sixty-twelve pipeline 62, and the other end of the flow direction control valve 41 is connected with a pipeline between the outlet ends of the first throttling mechanism 5 and the third one-way valve 23 through a sixty-nine pipeline 69; one end of a sixty-fifth pipe 65 is connected to a sixty-third pipe 63 between the inlet side of the compression mechanism 1 and the low-pressure node 73 of the four-way valve 2, and the other end of the sixty-fifth pipe 65 is connected to a pipe between the first heat exchanger 3 and the inlet side of the first check valve 21.

In operation, when the flow direction control valve 41 is closed, all the functions described in embodiment 1 can be realized; when the flow direction control valve 41 is fully opened and the first throttling mechanism 5 and the second throttling mechanism 7 work normally, the functions of refrigerating and producing hot water simultaneously according to the needs of users can be realized, and under the functions, the refrigerating capacity and the hot water capacity can be independently adjusted simultaneously according to the needs of the users. The air conditioner is suitable for use occasions with large heating load and small refrigerating load. At this time, the second heat exchanger 4 extracts heat from the environment, and the first heat exchanger 3 supplies cooling for the user, and the condensation heat generated by the cooling and the heat extracted from the environment are used to produce hot water in the third heat exchanger 8.

In the embodiment, when the refrigeration and hot water production function is performed simultaneously according to the requirement of a user, the first throttling mechanism 5 and the second throttling mechanism 7 work normally, and the flow direction control valve 41 is fully opened; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a fifty-ninth pipeline 59 and the third heat exchanger 8, enters a sixty-eight pipeline 68 and is divided into two paths; one path of the refrigerant passes through the second throttling mechanism 7, the second heat exchanger 4, the seventeenth pipeline 70, the second one-way valve 22, the sixteenth pipeline 64, the four-way valve 2 reversing node 74 and the four-way valve 2 low-pressure node 73 and enters the sixteenth pipeline 63, the other path of the refrigerant passes through the sixteenth pipeline 62, the flow direction control valve 41, the sixteenth pipeline 69, the first throttling mechanism 5, the first heat exchanger 3 and the sixteenth pipeline 65 and also enters the sixteenth pipeline 63, and the two paths of the refrigerant are mixed by the sixteenth pipeline 63 and then return to the inlet end of the compression mechanism 1.

Example 3

In the process of implementing the cooling and heat recovery function in embodiment 1, due to the heat dissipation of the four-way valve 2 and the surface of the pipeline, during a long-time operation, a small portion of high-temperature and high-pressure refrigerant gas inevitably condenses into liquid, which accumulates on the high-pressure side inside the four-way valve 2 or (and) in the sixty-fourth pipeline 64, so as to avoid or reduce the influence of this phenomenon on the cycle. As shown in fig. 3, a second capillary 12 is added to the system. The second capillary 12 is connected in the system as follows.

The first scheme is as follows: as shown in fig. 3, one end of the second capillary tube 12 is connected to the sixty-four pipe 64 at the outlet end of the second check valve 22, and the other end of the second capillary tube 12 is connected to the seventy pipe 70 at the inlet end of the second check valve 22.

Scheme II: one end of the second capillary tube 12 is connected to a sixty-four pipe 64 at the outlet end of the second check valve 22, and the other end of the second capillary tube 12 is connected to a sixty-three pipe 63.

For the same reason, embodiment 1 avoids the refrigerant liquid from accumulating in the high pressure side or (and) sixty-first pipe 61 inside the four-way valve 2 in the process of realizing the function of producing hot water alone. As shown in fig. 3, a first capillary 11 is added to the system. The first capillary 11 is connected in the system as follows.

The first scheme is as follows: as shown in fig. 3, one end of the first capillary tube 11 is connected to the sixty-first pipe 61 at the outlet end of the first check valve 21, and the other end of the first capillary tube 11 is connected to the pipe between the first throttling mechanism 5 and the first heat exchanger 3.

Scheme II: one end of the first capillary tube 11 is connected to the sixty-first pipe 61 at the outlet end of the first check valve 21, and the other end of the first capillary tube 11 is connected to the pipe between the inlet end of the first check valve 21 and the first heat exchanger 3.

The third scheme is as follows: one end of the first capillary tube 11 is connected to the sixty-first pipe 61 at the outlet end of the first check valve 21, and the other end of the first capillary tube 11 is connected to the sixty-third pipe 63.

In this embodiment, the connection manner of the first capillary 11 and the second capillary 12 in the system is also applicable to embodiment 2 and embodiment 4.

Example 4

As shown in fig. 4, the present embodiment is different from embodiment 1 in that a liquid reservoir 9, a third check valve 23, and a flow direction control valve 41 are added to the system.

The reservoir 9, the third check valve 23 and the flow direction control valve 41 are connected in the system in the following way: one end of the first throttling mechanism 5 is connected with the first heat exchanger 3, the other end of the first throttling mechanism 5 is connected with the liquid storage device 9, the inlet end of the third check valve 23 is connected with a sixty-sixth pipeline 66, the outlet end of the third check valve 23 is connected with the liquid storage device 9, one end of the flow direction control valve 41 is connected with a sixty-eighth pipeline 68 between the third heat exchanger 8 and the second throttling mechanism 7 through a sixty-twelfth pipeline 62, and the other end of the flow direction control valve 41 is connected with the liquid storage device 9 through a sixty-ninth pipeline 69.

This example illustrates the protocol applicable to all examples of the present invention except for examples 8 and 9.

Example 5

As shown in fig. 5, the present embodiment is also a multifunctional air-conditioning and refrigerating apparatus, which is used in the occasions with the requirements of refrigeration, heating and hot water all year round.

The whole equipment comprises the following components: the system comprises a compression mechanism 1, a four-way valve 2, a first throttling mechanism 5, a second throttling mechanism 7, a second one-way valve 22, a fourth one-way valve 24, a fifth one-way valve 25, a first heat exchanger 3, a second heat exchanger 4 and a third heat exchanger 8; the first throttling mechanism 5 and the second throttling mechanism 7 are electronic expansion valves; the first heat exchanger 3 is an evaporator, and is used for producing chilled water for refrigeration of users, and any one of a positive displacement heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger is usually adopted; the second heat exchanger 4 is a heat source side heat exchanger, and can be used as a condenser for radiating condensation heat generated by refrigeration to the environment, and can also be used as an evaporator for absorbing heat from the environment; the third heat exchanger 8 is a hot water heater, and produces hot water for users all year round, and as shown in fig. 9, the hot water produced by the third heat exchanger 8 is used for heating domestic hot water (produced by the domestic hot water heater 30) on the one hand and for heating (shown in fig. 9, 40 is a heating system and 50 is a circulating water pump) on the other hand, and the amount of heating between heating and producing domestic hot water is adjusted by the electric three-way valve 80 in winter. The air-conditioning refrigeration equipment can also realize the functions described in embodiment 1, and the work flows under the functions are respectively described as follows.

(1) Refrigeration and heat recovery

Under the function, the third heat exchanger 8 utilizes part of condensation heat generated by refrigeration to produce hot water, the other part of condensation heat is discharged into the environment through the second heat exchanger 4, and the first heat exchanger 3 supplies cold for users; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

When the throttle valve works, the first throttling mechanism 5 works normally, and the second throttling mechanism 7 is opened fully. The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of the second check valve 22, an outlet end of the second check valve 22, a fifty-ninth pipeline 59, the third heat exchanger 8, a sixty-eighth pipeline 68, the second throttling mechanism 7, the second heat exchanger 4, a seventy-th pipeline 70, a sixty-sixth pipeline 66, the first throttling mechanism 5, the first heat exchanger 3, a sixty-fifth pipeline 65 and a sixty-third pipeline 63, returns to the inlet end of the compression mechanism 1, and completes one working cycle.

(2) Producing hot water separately

In this function, the second heat exchanger 4 extracts heat from the environment, and with the extracted heat, hot water is produced in the third heat exchanger 8, and the first heat exchanger 3 is not operated.

When the throttle valve works, the first throttling mechanism 5 is closed, and the second throttling mechanism 7 works normally; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 74.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant passes through a sixty-fourth pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 74 of the four-way valve 2, a sixty-fourteenth pipeline 64, an inlet end of the fourth check valve 24, an outlet end of the fourth check valve 24, a fifty-ninth pipeline 59, a third heat exchanger 8, a sixty-eighth pipeline 68, a second throttling mechanism 7, a second heat exchanger 4, a seventy-seventh pipeline 70, a sixty-sixth pipeline 66, an inlet end of the fifth check valve 25, an outlet end of the fifth check valve 25, a sixty-first pipeline 61, a reversing node 72 of the four-way valve 2, a low-pressure node 73 of the four-way valve 2 and a sixty-third pipeline 63 in sequence, returns to the.

(3) Defrosting in winter

Example 6

As shown in fig. 6, the present embodiment is also a multifunctional air-conditioning and refrigerating apparatus, which is used in the occasions with the annual requirements of refrigeration, heating and hot water. The difference from the embodiment 5 is that a flow direction control valve 41 and a third check valve 23 are added in the system.

The flow direction control valve 41 and the third check valve 23 are connected in the system in the following way: the inlet end of the third one-way valve 23 is connected with a sixty-sixth pipeline 66, and the outlet end of the third one-way valve 23 is connected with the first heat exchanger 3 through a first throttling mechanism 5; one end of the flow direction control valve 41 is connected to a sixty-eight pipe 68 between the third heat exchanger 8 and the second throttling mechanism 7 through a sixty-twelve pipe 62, and the other end of the flow direction control valve 41 is connected to a pipe between the first throttling mechanism 5 and the outlet end of the third check valve 23 through a sixty-nine pipe 69.

In operation, when the flow direction control valve 41 is closed, all the functions described in embodiment 5 can be realized; when the flow direction control valve 41 is fully opened and the first throttling mechanism 5 and the second throttling mechanism 7 work normally, the functions of refrigerating and producing hot water simultaneously according to the needs of users can be realized, and under the functions, the refrigerating capacity and the hot water capacity can be independently adjusted simultaneously according to the needs of the users. At this time, the second heat exchanger 4 extracts heat from the environment, and the first heat exchanger 3 supplies cooling for the user, and the condensation heat generated by the cooling and the heat extracted from the environment are used to produce hot water in the third heat exchanger 8.

In this embodiment, when the refrigeration and hot water production function is performed simultaneously according to the user's requirement, the first throttling mechanism 5 and the second throttling mechanism 7 operate normally, and the flow direction control valve 41 is fully opened. The four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 74.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 74 of the four-way valve 2, a sixty-fourth pipeline 64, an inlet end of a fourth check valve 24, an outlet end of the fourth check valve 24, a fifty-ninth pipeline 59 and the third heat exchanger 8, enters a sixty-eight pipeline 68 and is divided into two paths; one path of the heat exchange fluid sequentially passes through a second throttling mechanism 7, a second heat exchanger 4, a seventy-fourth pipeline 70, a sixty-sixth pipeline 66, an inlet end of a fifth one-way valve 25, an outlet end of the fifth one-way valve 25, a sixty-first pipeline 61, a four-way valve 2 reversing node 72 and a four-way valve 2 low-pressure node 73 and enters a sixty-third pipeline 63; the other path of the flow passes through a sixty-two pipeline 62, a flow direction control valve 41, a sixty-nine pipeline 69, a first throttling mechanism 5, a first heat exchanger 3 and a sixty-five pipeline 65 in sequence and also enters a sixty-three pipeline 63; the two paths are mixed in a sixty-three pipeline 63 and then return to the inlet end of the compression mechanism 1, and one working cycle is completed.

Example 7

When the air-conditioning refrigeration equipment according to embodiments 1 to 6 of the present invention is designed as a split unit, the whole equipment is composed of two parts, namely, an outdoor unit and an indoor unit.

The outdoor unit consists of a second throttling mechanism 7 and a second heat exchanger 4; the indoor unit is composed of other parts except the second throttling mechanism 7 and the second heat exchanger 4 in the air-conditioning refrigeration equipment respectively described in the embodiments 1 to 6 of the invention; the outdoor unit and the indoor unit are connected through a sixteenth pipe 68 and a seventeenth pipe 70.

Example 8

As shown in fig. 7, the present embodiment is also a multifunctional air-conditioning and refrigerating apparatus, which is used in the occasions with the annual requirements of refrigeration, heating and hot water.

The whole equipment comprises the following components: the system comprises a compression mechanism 1, a four-way valve 2, a first throttling mechanism 5, a second throttling mechanism 7, a third throttling mechanism 6, a first one-way valve 21, a second one-way valve 22, a first heat exchanger 3, a second heat exchanger 4 and a third heat exchanger 8; the first throttling mechanism 5, the second throttling mechanism 7 and the third throttling mechanism 6 are electronic expansion valves; the first heat exchanger 3 is an evaporator, and is used for producing chilled water for refrigeration of users, and any one of a positive displacement heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger is usually adopted; the second heat exchanger 4 is a heat source side heat exchanger, and can be used as a condenser for radiating condensation heat generated by refrigeration to the environment, and can also be used as an evaporator for absorbing heat from the environment; the third heat exchanger 8 is a hot water heater, and produces hot water for users all year round, and as shown in fig. 9, the hot water produced by the third heat exchanger 8 is used for heating domestic hot water (produced by the domestic hot water heater 30) on the one hand and for heating (shown in fig. 9, 40 is a heating system and 50 is a circulating water pump) on the other hand, and the amount of heating between heating and producing domestic hot water is adjusted by the electric three-way valve 80 in winter. The air-conditioning refrigeration equipment can also realize the functions described in embodiment 1, and the work flows under the functions are respectively described as follows.

(1) Independent refrigeration

Under the function, all condensation heat generated by refrigeration is discharged into the environment through the second heat exchanger 4, the first heat exchanger 3 supplies cold for users, and the third heat exchanger 8 does not work; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 74.

During operation, the first throttling mechanism 5 works normally, the second throttling mechanism 7 is closed, and the third throttling mechanism 6 is fully opened. The first throttling mechanism 5 is used for throttling of the refrigerant liquid.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 74 of the four-way valve 2, a sixty-fourth pipeline 64, a second heat exchanger 4, a third throttling mechanism 6, a fifty-seventh pipeline 57, a fifty-eighth pipeline 58, a first throttling mechanism 5, a first heat exchanger 3, a sixty-fifth pipeline 65 and a sixty-third pipeline 63, and returns to the inlet end of the compression mechanism 1, so that one working cycle is completed.

(2) Refrigeration and partial heat recovery

When the heat exchanger works, the first throttling mechanism 5, the second throttling mechanism 7 and the third throttling mechanism 6 all work normally, the first throttling mechanism 5 is used for throttling refrigerant liquid, and the second throttling mechanism 7 and the third throttling mechanism 6 are respectively used for adjusting the flow of superheated refrigerant steam passing through the third heat exchanger 8 and the second heat exchanger 4.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 74 of the four-way valve 2 and enters a sixty-fourth pipeline 64 to be divided into two paths; one path of the liquid passes through a sixth twelfth pipeline 62, the inlet end of the second check valve 22, the outlet end of the second check valve 22, a fifty-first pipeline 51, the third heat exchanger 8, the second throttling mechanism 7 and a fifty-second pipeline 52 in sequence and enters a fifty-eighth pipeline 58; the other path of the heat exchange liquid passes through the second heat exchanger 4, the third throttling mechanism 6 and the fifty-seventh pipeline 57 in sequence and also enters the fifty-eighth pipeline 58; the two paths are mixed in the fifty-eighth pipeline 58, then sequentially pass through the first throttling mechanism 5, the first heat exchanger 3, the sixty-fifth pipeline 65 and the sixty-third pipeline 63, and return to the inlet end of the compression mechanism 1, and a working cycle is completed.

(3) Refrigeration and total heat recovery

Under the function, the third heat exchanger 8 produces hot water by using all condensation heat generated by refrigeration, the first heat exchanger 3 supplies cold for users, and the second heat exchanger 4 does not work; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

When the throttle valve works, the first throttling mechanism 5 works normally, the second throttling mechanism 7 is fully opened, and the third throttling mechanism 6 is closed. The first throttling mechanism 5 is used for throttling of the refrigerant liquid.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of the first check valve 21, an outlet end of the first check valve 21, a fifty-first pipeline 51, a third heat exchanger 8, a second throttling mechanism 7, a fifty-second pipeline 52, a fifty-eighth pipeline 58, a first throttling mechanism 5, a first heat exchanger 3, a sixty-fifth pipeline 65 and a sixty-third pipeline 63, and returns to the inlet end of the compression mechanism 1, so that one working cycle is completed.

(4) Producing hot water separately

When the device works, the first throttling mechanism 5 is closed, the second throttling mechanism 7 is fully opened, and the third throttling mechanism 6 works normally; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of the first check valve 21, an outlet end of the first check valve 21, a fifty-first pipeline 51, a third heat exchanger 8, a second throttling mechanism 7, a fifty-second pipeline 52, a fifty-seventh pipeline 57, a third throttling mechanism 6, a second heat exchanger 4, a sixty-fourth pipeline 64, a reversing node 74 of the four-way valve 2, a low-pressure node 73 of the four-way valve 2 and a sixty-third pipeline 63, returns to the inlet end of the compression mechanism 1, and completes one.

(5) Simultaneously refrigerating and producing hot water according to user's requirement

Under the function, the refrigerating capacity and the hot water capacity can be simultaneously and independently adjusted according to the needs of users. At this time, the second heat exchanger 4 extracts heat from the environment, and the first heat exchanger 3 supplies cooling for the user, and the condensation heat generated by the cooling and the heat extracted from the environment are used to produce hot water in the third heat exchanger 8.

When the device works, the first throttling mechanism 5 and the third throttling mechanism 6 work normally, and the second throttling mechanism 7 is fully opened. The first throttling mechanism 5 and the third throttling mechanism 6 are used for throttling the refrigerant liquid and respectively regulate the refrigerant flow passing through the first heat exchanger 3 and the second heat exchanger 4.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of a first check valve 21, an outlet end of the first check valve 21, a fifty-first pipeline 51, a third heat exchanger 8 and a second throttling mechanism 7, enters a fifty-second pipeline 52 and is divided into two paths; the first path sequentially passes through a fifty-seventh pipeline 57, a third throttling mechanism 6, a second heat exchanger 4, a sixty-fourth pipeline 64, a four-way valve 2 reversing node 74 and a four-way valve 2 low-pressure node 73 and enters a sixty-third pipeline 63; the second path sequentially passes through a fifth eighteenth pipeline 58, the first throttling mechanism 5, the first heat exchanger 3 and a sixty-fifth pipeline 65 and also enters a sixty-third pipeline 63; the two paths are mixed in a sixty-third pipeline 63, then return to the inlet end of the compression mechanism 1, enter the compression mechanism 1 and are compressed again, and a working cycle is completed.

(6) Defrosting in winter

During defrosting in winter, the working process is the same as the independent refrigeration function.

This embodiment is shown in fig. 7, and by adding a liquid receiver 9 to the system, there are the following further modifications, in this case, the connection scheme of the liquid receiver 9 in the system is: one end of the first throttling mechanism 5 is connected with the first heat exchanger 3, the other end of the first throttling mechanism 5 is connected with the liquid storage device 9 through a fifty-eighth pipeline 58, one end of the third throttling mechanism 6 is connected with the second heat exchanger 4, the other end of the third throttling mechanism 6 is connected with the liquid storage device 9 through a fifty-seventeenth pipeline 57, one end of the second throttling mechanism 7 is connected with the third heat exchanger 8, and the other end of the second throttling mechanism 7 is connected with any one of the fifty-seventh pipeline 57, the fifty-eighth pipeline 58 or the liquid storage device 9 through a fifty-twelfth pipeline 52.

Example 9

As shown in fig. 8, the present embodiment is also a multifunctional air-conditioning and refrigerating apparatus, which is used in the occasions with the requirements of refrigeration, heating and hot water all year round.

The whole equipment comprises the following components: the system comprises a compression mechanism 1, a four-way valve 2, a first throttling mechanism 5, a third throttling mechanism 6, a first one-way valve 21, a flow direction control valve 41, a first heat exchanger 3, a second heat exchanger 4 and a third heat exchanger 8; the first throttling mechanism 5 and the third throttling mechanism 6 are electronic expansion valves; the flow direction control valve 41 is a flow rate regulating valve; the first heat exchanger 3 is an evaporator, and is used for producing chilled water for refrigeration of users, and any one of a positive displacement heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger is usually adopted; the second heat exchanger 4 is a heat source side heat exchanger, and can be used as a condenser for radiating condensation heat generated by refrigeration to the environment, and can also be used as an evaporator for absorbing heat from the environment; the third heat exchanger 8 is a hot water heater, and produces hot water for users all year round, and as shown in fig. 9, the hot water produced by the third heat exchanger 8 is used for heating domestic hot water (produced by the domestic hot water heater 30) on the one hand and for heating (shown in fig. 9, 40 is a heating system and 50 is a circulating water pump) on the other hand, and the amount of heating between heating and producing domestic hot water is adjusted by the electric three-way valve 80 in winter. The air-conditioning refrigeration equipment can also realize the functions of the embodiment 8, and the work flows under the functions are respectively as follows.

(1) Independent refrigeration

When the valve works, the first throttling mechanism 5 works normally, the flow direction control valve 41 is closed, and the third throttling mechanism 6 is fully opened. The first throttling mechanism 5 is used for throttling of the refrigerant liquid.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 74 of the four-way valve 2, a sixty-fourth pipeline 64, a second heat exchanger 4, a third throttling mechanism 6, a sixty-seventh pipeline 67, a seventy-seventh pipeline 70, a first throttling mechanism 5, a first heat exchanger 3, a sixty-fifth pipeline 65 and a sixty-third pipeline 63, and returns to the inlet end of the compression mechanism 1, so that one working cycle is completed.

(2) Refrigeration and partial heat recovery

During operation, the first throttling mechanism 5, the flow direction control valve 41 and the third throttling mechanism 6 all work normally, the first throttling mechanism 5 is used for throttling refrigerant liquid, and the flow direction control valve 41 and the third throttling mechanism 6 are respectively used for adjusting the flow rate of superheated refrigerant steam passing through the third heat exchanger 8 and the second heat exchanger 4.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant enters a sixty-th pipeline 60 and is divided into two paths; one path sequentially passes through a high-pressure node 71 of the four-way valve 2, a reversing node 74 of the four-way valve 2, a sixteenth pipeline 64, a second heat exchanger 4, a third throttling mechanism 6 and a sixteenth pipeline 67 and enters a seventeenth pipeline 70; the other path of the water flows through a nineteenth pipeline 59, a flow direction control valve 41, a third heat exchanger 8 and a sixty-sixth pipeline 66 in sequence and also enters a seventy-fifth pipeline 70; the two paths are mixed in a seventy pipeline 70, then sequentially pass through a first throttling mechanism 5, a first heat exchanger 3, a sixty-five pipeline 65 and a sixty-three pipeline 63, and return to the inlet end of the compression mechanism 1, and a working cycle is completed.

(3) Refrigeration and total heat recovery

Under the function, the third heat exchanger 8 produces hot water by using all condensation heat generated by refrigeration, the first heat exchanger 3 supplies cold for users, and the second heat exchanger 4 does not work. The four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

When the valve operates, the first throttling mechanism 5 operates normally, and the flow direction control valve 41 and the third throttling mechanism 6 are closed. The first throttling mechanism 5 is used for throttling of the refrigerant liquid.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant returns to the inlet end of the compression mechanism 1 through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of the first check valve 21, an outlet end of the first check valve 21, the third heat exchanger 8, a sixty-sixth pipeline 66, a seventy-th pipeline 70, the first throttling mechanism 5, the first heat exchanger 3, a sixty-fifth pipeline 65 and a sixty-third pipeline 63 in sequence, and a working cycle is completed.

(4) Producing hot water separately

When the valve works, the flow direction control valve 41 and the first throttling mechanism 5 are closed, and the third throttling mechanism 6 works normally; the four-way valve 2 high pressure node 71 communicates with a four-way valve 2 commutation node 72.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of the first check valve 21, an outlet end of the first check valve 21, a third heat exchanger 8, a sixty-sixth pipeline 66, a sixty-seventh pipeline 67, a third throttling mechanism 6, a second heat exchanger 4, a sixty-fourth pipeline 64, a reversing node 74 of the four-way valve 2, a low-pressure node 73 of the four-way valve 2 and a sixty-third pipeline 63, and returns to the inlet end of the compression mechanism 1, so that.

When the valve operates, the first throttle mechanism 5 and the third throttle mechanism 6 operate normally, and the flow direction control valve 41 is closed. The first throttling mechanism 5 and the third throttling mechanism 6 are used for throttling the refrigerant liquid and respectively regulate the refrigerant flow passing through the first heat exchanger 3 and the second heat exchanger 4.

The working process is as follows: after being discharged from the outlet end of the compression mechanism 1, the refrigerant sequentially passes through a sixty-th pipeline 60, a high-pressure node 71 of the four-way valve 2, a reversing node 72 of the four-way valve 2, a sixty-first pipeline 61, an inlet end of the first check valve 21, an outlet end of the first check valve 21 and the third heat exchanger 8, enters a sixty-sixth pipeline 66 and is divided into two paths; the first path sequentially passes through a sixteenth pipeline 67, a third throttling mechanism 6, a second heat exchanger 4, a sixty-fourth pipeline 64, a four-way valve 2 reversing node 74 and a four-way valve 2 low-pressure node 73 and enters a sixty-third pipeline 63; the second path sequentially passes through a seventy pipeline 70, a first throttling mechanism 5, a first heat exchanger 3 and a sixty-five pipeline 65 and also enters a sixty-three pipeline 63; the two paths are mixed in a sixty-third pipeline 63, then return to the inlet end of the compression mechanism 1, enter the compression mechanism 1 and are compressed again, and a working cycle is completed.

(6) Defrosting in winter

This embodiment is shown in fig. 8, and there are the following three modifications.

1) Improvement scheme one

The solution shown in fig. 8 of this embodiment can be further modified by adding a liquid receiver 9 in the system, and in this case, the connection solution of the liquid receiver 9 in the system is: the outlet end of the third heat exchanger 8 is connected with the liquid receiver 9 through a sixteenth pipeline 66, one end of the third throttling mechanism 6 is connected with the second heat exchanger 4, the other end of the third throttling mechanism 6 is connected with the liquid receiver 9 through a sixteenth pipeline 67, one end of the first throttling mechanism 5 is connected with the first heat exchanger 3, and the other end of the first throttling mechanism 5 is connected with any one of the sixteenth pipeline 66, the sixteenth pipeline 67 or the liquid receiver 9 through a seventeenth pipeline 70.

2) Improvement scheme two

The scheme shown in fig. 8 of this embodiment can be further improved by adding a second throttling mechanism 7 to the system, where the second throttling mechanism 7 is a throttling mechanism (e.g. an electronic expansion valve) or a flow rate adjusting mechanism with a shutoff function, and at this time, the connection scheme of the second throttling mechanism 7 in the system is as follows: one end of the second throttling mechanism 7 is connected with the outlet end of the third heat exchanger 8, and the other end of the second throttling mechanism 7 is connected with a sixty-sixth pipeline 66.

In a second modification, the flow direction control valve 41 may be an electromagnetic valve, and all functions of the solution shown in fig. 8 of this embodiment can also be realized; when the second modification operates under the refrigeration and partial heat recovery function, the second throttling mechanism 7 is used for regulating the flow of the superheated refrigerant vapor passing through the third heat exchanger 8.

For the second improvement, a further improvement can be made by adding a liquid receiver 9 in the system, and in this case, the connection scheme of the liquid receiver 9 in the system is as follows: one end of the second throttling mechanism 7 is connected with the outlet end of the third heat exchanger 8, the other end of the second throttling mechanism 7 is connected with the liquid storage device 9 through a sixteenth pipeline 66, one end of the third throttling mechanism 6 is connected with the second heat exchanger 4, the other end of the third throttling mechanism 6 is connected with the liquid storage device 9 through a sixteenth pipeline 67, one end of the first throttling mechanism 5 is connected with the first heat exchanger 3, and the other end of the first throttling mechanism 5 is connected with any one of the sixteenth pipeline 66, the sixteenth pipeline 67 or the liquid storage device 9 through a seventeenth pipeline 70.

3) Improvement scheme three

The difference between the third modification and the scheme shown in fig. 8 of this embodiment is: the position of the flow direction control valve 41 in the system is different. In the third improvement, one end of the flow direction control valve 41 is connected to a sixty-sixth pipeline 66, the other end of the flow direction control valve 41 is connected to a sixty-sixth pipeline 60 between the outlet end of the compression mechanism 1 and the high-pressure node 71 of the four-way valve 2 sequentially through the outlet end of the third heat exchanger 8, the inlet end of the third heat exchanger 8 and a fifty-ninth pipeline 59, the inlet end of the first check valve 21 is connected to a sixty-first pipeline 61, and the outlet end of the first check valve 21 is connected to the inlet end of the third heat exchanger 8.

In the present modification, the flow direction control valve 41 may employ a throttling mechanism (e.g., an electronic expansion valve) having a shut-off function or a flow rate adjusting mechanism. In operation, the present modification can also realize the function of the embodiment shown in fig. 8 by controlling the flow direction control valve 41.

Example 10

Embodiment 1 the solution shown in fig. 1 can be further improved by adding an oil separator 90 in the system, and in this case, the oil separator 90 is connected in the system in the following manner: the inlet end of the oil separator 90 is connected to the outlet end of the compression mechanism 1, and the outlet end of the oil separator 90 is connected to the sixteenth pipe 60. In operation, the oil separator 90 functions to separate oil from the exhaust gas of the compression mechanism 1. This embodiment is applicable to all embodiments of the present invention.

Example 11

Example 1 the solution shown in fig. 1 can be further improved by adding a gas-liquid separator 91 in the system, and in this case, the gas-liquid separator 91 is connected in the system in the following way: the outlet end of the gas-liquid separator 91 is connected to the inlet end of the compression mechanism 1, and the inlet end of the gas-liquid separator 91 is connected to the sixty-third pipe 63. During operation, the gas-liquid separator 91 serves to separate refrigerant liquid in the intake air of the compression mechanism 1, thereby avoiding liquid hammering.

This embodiment is applicable to all embodiments of the present invention.

In all the solutions of the above embodiments of the present invention, the flow direction control valve 41 can be replaced by any one of a solenoid valve, a throttling mechanism (e.g., an electronic expansion valve) with a shutoff function, or a flow rate adjusting mechanism; the compression mechanism 1 may adopt a single-stage compression composed of at least one compressor, or may adopt a two-stage compression composed of at least one low-pressure stage compressor and at least one high-pressure stage compressor, at this time, the inlet end of the low-pressure stage compressor is connected to the low-pressure node 73 of the four-way valve 2 through a sixteenth pipeline 63, the outlet end of the low-pressure stage compressor is connected to the sixteenth pipeline 60 sequentially through the inlet end of the high-pressure stage compressor and the outlet end of the high-pressure stage compressor, or of course, may adopt a two-stage single-stage compression mode composed of at least one compressor.

Any one or two of the low-pressure stage compressor and the high-pressure stage compressor can adopt any one of the following compressors: piston compressor, vortex compressor, screw compressor, rolling rotor compressor, sliding vane compressor, rotary vane compressor, centrifugal compressor, digital vortex compressor; any one or two of the low-pressure stage compressor and the high-pressure stage compressor can be a variable capacity compressor (such as an inverter compressor and a digital scroll compressor) or a fixed speed compressor.

In the solutions of all the above embodiments of the present invention, the compression mechanism 1 may adopt any one of the following compressors: piston compressor, vortex compressor, screw compressor, rolling rotor compressor, sliding vane compressor, rotary vane compressor, centrifugal compressor, digital vortex compressor; the compression mechanism 1 can also be a variable-capacity compressor (such as an inverter compressor and a digital scroll compressor), or a fixed-speed compressor; the compression mechanism 1 can also be a compressor unit consisting of at least one variable-capacity compressor or a compressor unit consisting of at least one constant-speed compressor; the compression mechanism 1 may be a compressor unit including at least one variable capacity compressor and at least one fixed speed compressor.

In all the embodiments of the present invention described above, any one of the first throttling mechanism 5, the second throttling mechanism 7, and the third throttling mechanism 6, or even all the throttling mechanisms, is a throttling mechanism having a shut-off function, for example: an electronic expansion valve.

In all the embodiments of the present invention, any one of the solenoid valve, the throttling mechanism (e.g., electronic expansion valve) with a shut-off function, or the flow rate adjusting mechanism may be used instead of one or more, or even all, of the first check valve 21, the second check valve 22, the third check valve 23, the fourth check valve 24, and the fifth check valve 25.

In the solutions of all the above embodiments of the present invention, the first heat exchanger 3 may be a refrigerant-air heat exchanger, or a refrigerant-water heat exchanger or other heat exchangers; as the refrigerant-water heat exchanger, the first heat exchanger 3 is generally any one of a positive displacement heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, and a double-tube heat exchanger. The second heat exchanger 4 may be a refrigerant-soil heat exchanger, a refrigerant-water heat exchanger, an evaporative heat exchanger, a solar heat collector, or another type of heat exchanger, in addition to the refrigerant-air heat exchanger; as the refrigerant-water heat exchanger, the second heat exchanger 4 is generally any one of a positive displacement heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, and a double-tube heat exchanger.

The third heat exchanger 8 may be a refrigerant-air heat exchanger, a solution heater or a solution regenerator or other kinds of heat exchangers according to usage needs, besides the third heat exchanger 8 may be a refrigerant-water heat exchanger; as the refrigerant-water heat exchanger, the third heat exchanger 8 is generally any one of a positive displacement heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, or a double-tube heat exchanger, or another type of heat exchanger as needed.

When any one of the first heat exchanger 3, the second heat exchanger 4 or the third heat exchanger 8 is used as a refrigerant-air heat exchanger, a fin-type heat exchanger is usually adopted, fins of the fin-type heat exchanger are generally made of aluminum or aluminum alloy, and copper materials are also used in some special occasions. The shape of the fins is generally any of a flat plate type, a corrugated type, or a slit fin type.

In the solutions of all the above embodiments of the present invention, the pipes are all copper pipes.

In the solutions of all the above embodiments of the present invention, the connection modes between the third heat exchanger 8, the domestic hot water heater 30, the heating system 40, the circulating water pump 50, and the electric three-way valve 80 are as follows: any one of the two connecting nodes on the hot water side of the third heat exchanger 8 is connected with any one of the two through connecting nodes of the electric three-way valve 80, the other through connecting node of the electric three-way valve 80 is connected with the other connecting node on the hot water side of the third heat exchanger 8 through the heating system 40, the suction end of the circulating water pump 50 and the pressure outlet end of the circulating water pump 50 in sequence, and the bypass connecting node of the electric three-way valve 80 is connected with the suction end pipeline of the circulating water pump 50 through the domestic hot water heater 30.

In the working process, for the functions of simultaneously refrigerating and producing hot water according to the user requirements in the

embodiments

2 and 6 of the invention, when the compression mechanism 1 adopts a variable capacity compressor (such as an inverter compressor and a digital scroll compressor), the following four operation control methods are available.

The first scheme is as follows: the first heat exchanger 3 and the second heat exchanger 4 are both refrigerant water heat exchangers; the first heat exchanger 3 is used for producing chilled water; the second heat exchanger 4 is used to extract heat from the cooling water.

The control method of the first scheme comprises the following steps: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the second throttling mechanism 7 is used for controlling the outlet water temperature of the chilled water side of the first heat exchanger 3, namely: when the temperature of the chilled water at the outlet of the first heat exchanger 3 is higher than a set value, the opening degree of the second throttling mechanism 7 is reduced, and when the temperature of the chilled water at the outlet of the first heat exchanger 3 is lower than the set value, the opening degree of the second throttling mechanism 7 is increased; the flow rate of the cooling water on the cooling water side through the second heat exchanger 4 is controlled by the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4, that is: when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is higher than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is decreased, and when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is lower than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is increased.

Scheme II: the first heat exchanger 3 is a refrigerant-water heat exchanger for producing chilled water; the second heat exchanger 4 is a refrigerant-to-air heat exchanger for extracting heat from the air.

The control method of the second scheme is as follows: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the second throttling mechanism 7 is used for controlling the outlet water temperature of the chilled water side of the first heat exchanger 3, namely: when the temperature of the chilled water at the outlet of the first heat exchanger 3 is higher than a set value, the opening degree of the second throttling mechanism 7 is reduced, and when the temperature of the chilled water at the outlet of the first heat exchanger 3 is lower than the set value, the opening degree of the second throttling mechanism 7 is increased; the amount of air flow through the air side of the second heat exchanger 4 is controlled by the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4, and the conventional method is: the air flow through the air side of the second heat exchanger 4 is controlled by adjusting the fan operating frequency of the air side of the second heat exchanger 4, i.e.: when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is higher than a set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is reduced, and when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is lower than the set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is increased.

The third scheme is as follows: the first heat exchanger 3 is a refrigerant-air heat exchanger for cooling air; the second heat exchanger 4 is a refrigerant-water heat exchanger for extracting heat from the cooling water.

The control method of the third scheme is as follows: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the second throttle 7 is used to control the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3, namely: when the outlet air temperature or the inlet air temperature of the air side of the first heat exchanger 3 is higher than a set value, the opening degree of the second throttling mechanism 7 is reduced, and when the outlet air temperature or the inlet air temperature of the air side of the first heat exchanger 3 is lower than the set value, the opening degree of the second throttling mechanism 7 is increased; the flow rate of the cooling water on the cooling water side through the second heat exchanger 4 is controlled by the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4, that is: when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is higher than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is decreased, and when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is lower than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is increased.

And the scheme is as follows: the first heat exchanger 3 and the second heat exchanger 4 are both refrigerant-air heat exchangers; the first heat exchanger 3 is used for cooling air; the second heat exchanger 4 is used to extract heat from the air.

The control method of the fourth scheme is as follows: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the second throttle 7 is used to control the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3, namely: when the outlet air temperature or the inlet air temperature of the air side of the first heat exchanger 3 is higher than a set value, the opening degree of the second throttling mechanism 7 is reduced, and when the outlet air temperature or the inlet air temperature of the air side of the first heat exchanger 3 is lower than the set value, the opening degree of the second throttling mechanism 7 is increased; the amount of air flow through the air side of the second heat exchanger 4 is controlled by the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4, and the conventional method is: the air flow through the air side of the second heat exchanger 4 is controlled by adjusting the fan operating frequency of the air side of the second heat exchanger 4, i.e.: when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is higher than a set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is reduced, and when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is lower than the set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is increased.

In the working process, for the functions of simultaneously refrigerating and producing hot water according to the user requirements in the embodiments 8 and 9 of the present invention, when the compression mechanism 1 adopts a variable capacity compressor (for example, an inverter compressor or a digital scroll compressor), there are also the following four operation control methods.

The first scheme is as follows: the first heat exchanger 3 and the second heat exchanger 4 are both refrigerant-water heat exchangers; the first heat exchanger 3 is used for producing chilled water; the second heat exchanger 4 is used to extract heat from the cooling water.

The control method of the first scheme comprises the following steps: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the third throttling mechanism 6 is used for controlling the outlet water temperature of the chilled water side of the first heat exchanger 3, namely: when the temperature of the chilled water at the outlet of the first heat exchanger 3 is higher than a set value, the opening degree of the third throttling mechanism 6 is reduced, and when the temperature of the chilled water at the outlet of the first heat exchanger 3 is lower than the set value, the opening degree of the third throttling mechanism 6 is increased; the flow rate of the cooling water on the cooling water side through the second heat exchanger 4 is controlled by the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4, that is: when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is higher than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is decreased, and when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is lower than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is increased.

The control method of the second scheme is as follows: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the third throttling mechanism 6 is used for controlling the outlet water temperature of the chilled water side of the first heat exchanger 3, namely: when the temperature of the chilled water at the outlet of the first heat exchanger 3 is higher than a set value, the opening degree of the third throttling mechanism 6 is reduced, and when the temperature of the chilled water at the outlet of the first heat exchanger 3 is lower than the set value, the opening degree of the third throttling mechanism 6 is increased; the amount of air flow through the air side of the second heat exchanger 4 is controlled by the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4, and the conventional method is: the air flow through the air side of the second heat exchanger 4 is controlled by adjusting the fan operating frequency of the air side of the second heat exchanger 4, i.e.: when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is higher than a set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is reduced, and when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is lower than the set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is increased.

The control method of the third scheme is as follows: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the third throttling mechanism 6 is used to control the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3, i.e.: when the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3 is higher than a set value, the opening degree of the third throttling mechanism 6 is reduced, and when the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3 is lower than the set value, the opening degree of the third throttling mechanism 6 is increased; the flow rate of the cooling water on the cooling water side through the second heat exchanger 4 is controlled by the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4, that is: when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is higher than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is decreased, and when the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4 is lower than a set value, the flow rate of the cooling water on the cooling water side passing through the second heat exchanger 4 is increased.

The control method of the fourth scheme is as follows: the outlet water temperature of the hot water side of the third heat exchanger 8 is used for controlling the flow of the refrigerant output by the compression mechanism 1, namely: for a variable frequency compressor, the operating frequency of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8, and for a digital scroll compressor, the load time of the compression mechanism 1 is controlled by using the outlet water temperature of the hot water side of the third heat exchanger 8; the first throttling mechanism 5 adjusts the opening degree according to the superheat degree of the refrigerant at the refrigerant side outlet of the first heat exchanger 3; the third throttling mechanism 6 is used to control the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3, i.e.: when the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3 is higher than a set value, the opening degree of the third throttling mechanism 6 is reduced, and when the outlet air temperature or the inlet air temperature on the air side of the first heat exchanger 3 is lower than the set value, the opening degree of the third throttling mechanism 6 is increased; the amount of air flow through the air side of the second heat exchanger 4 is controlled by the degree of superheat of the refrigerant side outlet refrigerant of the second heat exchanger 4, and the conventional method is: the air flow through the air side of the second heat exchanger 4 is controlled by adjusting the fan operating frequency of the air side of the second heat exchanger 4, i.e.: when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is higher than a set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is reduced, and when the superheat degree of the refrigerant at the refrigerant side outlet of the second heat exchanger 4 is lower than the set value, the operation frequency of the fan at the air side of the second heat exchanger 4 is increased.

Claims

2. Air-conditioning refrigeration equipment according to claim 1, characterized in that the inlet end of the third check valve (23) is connected with a seventeenth pipeline (70) through a sixteenth pipeline (66), and the outlet end of the third check valve (23) is connected with the first heat exchanger (3) through a first throttling mechanism (5); one end of the flow direction control valve (41) is connected with a sixty-eight pipeline (68) between the third heat exchanger (8) and the second throttling mechanism (7) through a sixty-twelve pipeline (62), and the other end of the flow direction control valve (41) is connected with a pipeline between the outlet ends of the first throttling mechanism (5) and the third one-way valve (23) through a sixty-nine pipeline (69); one end of a sixty-five pipeline (65) is connected with a sixty-three pipeline (63) between the inlet end of the compression mechanism (1) and a low-pressure node (73) of the four-way valve (2), and the other end of the sixty-five pipeline (65) is connected with a pipeline between the first heat exchanger (3) and the inlet end of the first one-way valve (21).

3. The utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a second throttling mechanism (7), a third heat exchanger (8), a second one-way valve (22), a fourth one-way valve (24) and a fifth one-way valve (25); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-fourth pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63) in sequence, any node (72) of two reversing nodes of the four-way valve (2) is connected with a sixty-third pipeline (63) between the inlet end of the compression mechanism (1) and the low-pressure node (73) of the four-way valve (2) through a sixty-fourth pipeline (64), the inlet end of the fourth one-way valve (24) in sequence, a sixty-fourth pipeline (63), a fifth one-way valve (25), an inlet end of the fifth one-way valve (25), a sixty-sixth pipeline (66), a first throttling mechanism (5), a first heat exchanger (3) and a sixty-fifth pipeline (65), and the other reversing, The outlet end of a fourth check valve (24), a fifty-ninth pipeline (59), a third heat exchanger (8), a sixty-eight pipeline (68), a second throttling mechanism (7), a second heat exchanger (4) and a seventy pipeline (70) are connected with a sixty-six pipeline (66) between the inlet ends of the first throttling mechanism (5) and the fifth check valve (25), the inlet end of the second check valve (22) is connected with a sixty-first pipeline (61) between the outlet end of the fifth check valve (25) and a reversing node of the four-way valve (2), and the outlet end of the second check valve (22) is connected with a fifty-ninth pipeline (59) between the outlet end of the fourth check valve (24) and the third heat exchanger (8).

4. Air-conditioning refrigeration equipment according to claim 3, characterized in that the inlet end of the third check valve (23) is connected with a sixty-sixth pipeline (66), and the outlet end of the third check valve (23) is connected with the first heat exchanger (3) through the first throttling mechanism (5); one end of the flow direction control valve (41) is connected with a sixty-eight pipeline (68) between the third heat exchanger (8) and the second throttling mechanism (7) through a sixty-twelve pipeline (62), and the other end of the flow direction control valve (41) is connected with a pipeline between the outlet ends of the first throttling mechanism (5) and the third one-way valve (23) through a sixty-nine pipeline (69).

5. The utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a second throttling mechanism (7), a third throttling mechanism (6), a third heat exchanger (8), a first one-way valve (21) and a second one-way valve (22); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-th pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63), any one node (74) of two reversing nodes of the four-way valve (2) is connected with the other reversing node (72) of the four-way valve (2) through a sixty-fourth pipeline (64), a second heat exchanger (4), a third throttling mechanism (6), a fifty-seventh pipeline (57), a fifty-second pipeline (52), a second throttling mechanism (7), a third heat exchanger (8), a fifty-first pipeline (51), the outlet end of the first check valve (21), the inlet end of the first check valve (21) and a sixty-first pipeline (61) in sequence, the inlet end of the second check valve (22) is connected with the sixty-fourth pipeline (64) through a sixty-second, the outlet end of the second check valve (22) is connected with a fifty-first pipeline (51) between the outlet end of the first check valve (21) and the third heat exchanger (8), one end of the first heat exchanger (3) is connected with a sixty-third pipeline (63) between the inlet end of the compression mechanism (1) and a low-pressure node (73) of the four-way valve (2) through a sixty-fifth pipeline (65), and the other end of the first heat exchanger (3) is connected with a pipeline between the second throttling mechanism (7) and the third throttling mechanism (6) through a fifty-eighth pipeline (58) and a first throttling mechanism (5) in sequence.

6. Air conditioning refrigeration unit according to claim 5, characterized in that the first throttle (5) is connected at one end to a first heat exchanger (3), the first throttle (5) is connected at the other end to a liquid reservoir (9) by a fifty-eighth conduit (58), the third throttle (6) is connected at one end to a second heat exchanger (4), the third throttle (6) is connected at the other end to the liquid reservoir (9) by a fifty-seventeenth conduit (57), the second throttle (7) is connected at one end to a third heat exchanger (8), and the second throttle (7) is connected at the other end to any of the fifty-seventh conduit (57), fifty-eighth conduit (58), or liquid reservoir (9) by a fifty-twelfth conduit (52).

7. The utility model provides an air conditioner refrigeration plant, includes compression mechanism (1), cross valve (2), first heat exchanger (3), second heat exchanger (4) and first throttle mechanism (5), characterized by: the air-conditioning refrigeration equipment also comprises a third throttling mechanism (6), a third heat exchanger (8) and a first one-way valve (21); a high-pressure node (71) of the four-way valve (2) is connected with the outlet end of the compression mechanism (1) through a sixty-fourth pipeline (60), a low-pressure node (73) of the four-way valve (2) is connected with the inlet end of the compression mechanism (1) through a sixty-third pipeline (63), any node (74) of two reversing nodes of the four-way valve (2) is sequentially connected with a sixty-fourteen pipeline (64), the second heat exchanger (4), the third throttling mechanism (6), a sixty-seventh pipeline (67), a seventy-fourth pipeline (70), the first throttling mechanism (5), the first heat exchanger (3) and a sixty-fifth pipeline (65) between the inlet end of the compression mechanism (1) and the low-pressure node (73) of the four-way valve (2), the inlet end of the third heat exchanger (8) is connected with the sixty-third pipeline (60) between the outlet end of the compression mechanism (1) and the high-pressure node (71) of the four-way valve (2) through a fifty-ninth pipeline ( And the outlet end of the third heat exchanger (8) is connected with a pipeline between the first throttling mechanism (5) and the third throttling mechanism (6) through a sixteenth pipeline (66), the inlet end of the first one-way valve (21) is connected with the other reversing node (72) of the four-way valve (2) through a sixteenth pipeline (61), and the outlet end of the first one-way valve (21) is connected with the inlet end of the third heat exchanger (8) through a pipeline.

8. Air-conditioning refrigeration equipment according to claim 7, characterized in that one end of a flow direction control valve (41) is connected with a sixty-th pipeline (60) between the outlet end of the compression mechanism (1) and a high-pressure node (71) of a four-way valve (2) through a fifty-ninth pipeline (59), and the other end of the flow direction control valve (41) is connected with the inlet end of the third heat exchanger (8) and the outlet end of the first check valve (21).

9. Air-conditioning refrigeration unit according to claim 7, characterized in that the outlet end of the third heat exchanger (8) is connected to a sixty-sixth conduit (66) via a flow direction control valve (41).

10. Air-conditioning refrigeration unit according to claim 1 or 3, characterized in that the first throttling mechanism (5) is connected to the first heat exchanger (3) at one end, the first throttling mechanism (5) is connected to the liquid reservoir (9) at the other end, the inlet end of the third check valve (23) is connected to a sixty-sixth pipe (66), the outlet end of the third check valve (23) is connected to the liquid reservoir (9), one end of the flow direction control valve (41) is connected to a sixty-eight pipe (68) between the third heat exchanger (8) and the second throttling mechanism (7) through a sixty-twelve pipe (62), and the other end of the flow direction control valve (41) is connected to the liquid reservoir (9) through a sixty-nine pipe (69).