CN108571791B

CN108571791B - Air conditioning system and refrigeration method thereof

Info

Publication number: CN108571791B
Application number: CN201810402541.5A
Authority: CN
Inventors: 王浩; 闫晨; 谷长城
Original assignee: Beijing Baidu Netcom Science and Technology Co Ltd
Current assignee: Beijing Baidu Netcom Science and Technology Co Ltd
Priority date: 2018-04-28
Filing date: 2018-04-28
Publication date: 2020-12-11
Anticipated expiration: 2038-04-28
Also published as: CN108571791A

Abstract

The invention provides an air conditioning system and a refrigeration method thereof, wherein the air conditioning system comprises a gravity heat pipe unit, and a heat exchanger of the gravity heat pipe unit is connected with each cabinet back plate through a liquid secondary refrigerant pipeline and a gaseous secondary refrigerant pipeline to form a circulation loop; and valve components of the gravity heat pipe unit are respectively arranged on the liquid secondary refrigerant pipeline and the gaseous secondary refrigerant pipeline. The valve assembly is used for connecting the compressor assembly and the expansion valve assembly respectively. The refrigeration method comprises the steps that when a fault of one gravity heat pipe unit is detected, an expansion valve assembly is connected to a liquid secondary refrigerant pipeline of the other gravity heat pipe unit, and a compressor assembly is connected to a gaseous secondary refrigerant pipeline. The expansion valve assembly and the compressor assembly are used as redundant assemblies of the gravity heat pipe unit, more cold loads can be provided for the gravity heat pipe unit when needed, the temperature of a machine room is stabilized, and the expansion valve assembly and the compressor assembly can be used as redundant assemblies when not needed, so that the space and the cost of the machine room are saved.

Description

Air conditioning system and refrigeration method thereof

Technical Field

The invention relates to the technical field of data center equipment, in particular to an air conditioning system and a refrigerating method thereof.

Background

In the prior art, a data center adopts a plurality of sets of heat pipe systems to cool a cabinet, and a set of redundant heat pipe systems is arranged for standby. For example, in the design mode of the redundant heat pipe system of 2+1, 3 circulation loops are arranged for single-row cabinet coolant circulation, the first circulation loop bears the load of part of cabinets, the second circulation loop bears the load of the rest cabinets, the third circulation loop is standby, and when the first circulation loop or the second circulation loop fails, the third circulation loop is replaced at any time to continue bearing the load of the cabinets. However, this solution is only applicable to small-sized equipment rooms with a small number of cabinets, and once the solution is applied to a large-sized equipment room, the number of required redundant heat pipe systems is greatly increased. Because the space in the machine room is limited, the redundant heat pipe system can occupy the space of the machine room, and the bearing capacity and the utilization rate of equipment in the machine room are reduced. Meanwhile, the redundant system is generally in an idle state, so that the investment cost of the machine room is increased, and inconvenience is brought to machine room construction.

Disclosure of Invention

The embodiment of the invention provides an air conditioning system and a refrigerating method thereof, which at least solve the technical problems in the prior art.

In a first aspect, an embodiment of the present invention provides an air conditioning system, including a plurality of gravity heat pipe units, where each gravity heat pipe unit includes a heat exchanger, a liquid coolant pipeline, and a gaseous coolant pipeline, and the heat exchanger is connected to back plates of respective cabinets through the liquid coolant pipeline and the gaseous coolant pipeline to form a circulation loop;

the gravity heat pipe unit further comprises a first valve assembly and a second valve assembly, wherein the first valve assembly is arranged at one end, close to the heat exchanger, of the liquid secondary refrigerant pipeline and is used for controlling the liquid secondary refrigerant pipeline to be communicated with the expansion valve assembly in a self-communication mode or controlling the liquid secondary refrigerant pipeline to be communicated with the expansion valve assembly; the second valve assembly is arranged at one end, close to the heat exchanger, of the gaseous secondary refrigerant pipeline and is used for controlling the gaseous secondary refrigerant pipeline to be communicated with the compressor assembly in a self-communicating mode or controlling the gaseous secondary refrigerant pipeline to be communicated with the compressor assembly.

In one possible design, the expansion valve assembly includes a throttling member coupled to the first valve assembly for reducing the temperature, pressure, and flow of the coolant in the liquid coolant line.

In one possible design, the compressor assembly includes a boost member coupled to the second valve assembly for increasing the cycle efficiency of the coolant in the gaseous coolant line.

In one possible design, the compressor assembly further includes a gas-liquid separator connected to the pressure increasing member, and an inlet end of the gas-liquid separator and an outlet end of the pressure increasing member are respectively connected to the second valve assembly.

In one possible design, the first valve assembly includes a first main valve disposed on the liquid coolant pipeline, a first branch and a second branch are disposed on two sides of the first main valve, respectively, and are used for communicating the liquid coolant pipeline, a first bypass valve is disposed on the first branch, a second bypass valve is disposed on the second branch, and the first bypass valve and the second bypass valve are used for connecting the expansion valve assembly.

In one possible design, the first valve assembly is configured to control the first main valve to open when in the first state, and the first bypass valve and the second bypass valve are closed to allow the liquid coolant line to be self-communicating; when in the second state, the first main valve is controlled to be closed, and the first bypass valve and the second bypass valve are controlled to be opened, so that the liquid coolant pipeline is communicated with the expansion valve assembly.

In one possible design, the first bypass valve and the second bypass valve are connected at both ends of a throttling part of the expansion valve assembly, respectively.

In one possible design, the second valve assembly includes a second main valve disposed on the gaseous coolant pipeline, a third branch and a fourth branch communicated with the gaseous coolant pipeline are disposed on two sides of the second main valve, respectively, a third bypass valve is disposed on the third branch, and a fourth bypass valve is disposed on the fourth branch, and the third bypass valve and the fourth bypass valve are used for connecting the compressor assembly.

In one possible design, the second valve assembly is operable to control the second main valve to open when in the first state, and the third and fourth bypass valves are closed to allow the gaseous coolant line to be self-communicating; in a second state, the second main valve is controlled to close, and the third and fourth bypass valves are controlled to open to place the gaseous coolant line in communication with the compressor assembly.

In one possible design, the third bypass valve and the fourth bypass valve are connected to both ends of a pressure increasing part of the compressor assembly, respectively.

In one possible design, the first valve component is connected to the expansion valve component by a quick connector, and the second valve component is connected to the compressor component by the quick connector.

In a second aspect, an embodiment of the present invention provides a refrigeration method for an air conditioning system, where the air conditioning system includes a plurality of gravity heat pipe units, each gravity heat pipe unit includes a heat exchanger, a liquid coolant pipeline, and a gaseous coolant pipeline, and the heat exchanger is connected to back plates of respective cabinets through the liquid coolant pipeline and the gaseous coolant pipeline to form a circulation loop; the method comprises the following steps:

when a failure of one of the gravity heat pipe units is detected, controlling a first valve assembly to be connected with an expansion valve assembly on the liquid coolant pipeline of the other gravity heat pipe unit, and controlling a second valve assembly to be connected with a compressor assembly on the gaseous coolant pipeline;

the expansion valve assembly and the compressor assembly work together to increase the cooling load provided by the other gravity heat pipe unit so as to indirectly exchange heat with the gas at the back plate of each cabinet connected with the failed gravity heat pipe unit.

With reference to the second aspect, the present invention, in a first embodiment of the second aspect, further includes:

when a failure of the back panel of any of the cabinets is detected, disposing the expansion valve assembly on the liquid coolant line of at least one of the gravity heat pipe units not connected to the failed back panel, and disposing the compressor assembly on the gaseous coolant line; or

When a failure of the back plate of any of the cabinets is detected, the expansion valve assembly is arranged on the liquid coolant pipeline of the gravity heat pipe unit connected with the failed back plate, and the compressor assembly is arranged on the gaseous coolant pipeline.

One of the above technical solutions has the following advantages or beneficial effects: 1. according to the embodiment of the invention, the first valve component used for being connected with the expansion valve component is arranged on the liquid secondary refrigerant pipeline of the gravity heat pipe unit, and the second valve component used for being connected with the compressor component is arranged on the gaseous secondary refrigerant pipeline, so that when any gravity heat pipe unit fails, the cold load of any gravity heat pipe unit can be improved by the rest gravity heat pipe units through the expansion valve component and the compressor component, the heat load of a cabinet connected with the failed gravity heat pipe unit is balanced, and the temperature stability of a machine room is ensured. 2. Because the expansion valve component and the compressor component of the embodiment of the invention can be detachably configured according to the cold quantity condition of the air conditioning system, the expansion valve component and the compressor component can be used as redundant components to reduce the space of a machine room and save the cost, and meanwhile, the expansion valve component and the compressor component have simple structures.

The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and following detailed description.

Drawings

In the drawings, like reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily to scale. It is appreciated that these drawings depict only some embodiments in accordance with the disclosure and are therefore not to be considered limiting of its scope.

Fig. 1 is a structural view of an air conditioning system according to an embodiment of the present invention.

Fig. 2 is a connection structure diagram of the air conditioning system, the expansion valve assembly and the compressor assembly according to the embodiment of the invention.

FIG. 3 is a block diagram of a first valve component according to an embodiment of the present invention.

FIG. 4 is a block diagram of a second valve assembly of an embodiment of the present invention.

Fig. 5 is a structural view of a compressor assembly according to an embodiment of the present invention.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present specification, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or component in question must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present specification, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection or communication; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, unless otherwise expressly stated or limited, "above" or "below" a first feature may mean that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other through another feature therebetween. Also, the first feature being "on," "square," and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

As shown in fig. 1 and fig. 2, an embodiment of the present invention provides an air conditioning system, which includes a plurality of gravity assisted heat pipe units 100, wherein each gravity assisted heat pipe unit 100 is configured with a plurality of cabinets 200 for exchanging heat with an air flow flowing through a back panel 201 of the cabinet 200. The gravity heat pipe unit 100 includes a heat exchanger 2, a liquid coolant line 3, and a gaseous coolant line 4. The heat exchanger 2 is connected with the back panel 201 of each cabinet 200 through the liquid coolant pipeline 3 and the gaseous coolant pipeline 4 to form a circulation loop.

The gravity heat pipe unit 100 further includes a first valve assembly 5 and a second valve assembly 6. The first valve assembly 5 is disposed at one end of the liquid coolant pipeline 3 close to the heat exchanger 2, and is used for controlling the liquid coolant pipeline 3 to be communicated with the expansion valve assembly 7 or controlling the liquid coolant pipeline 3 to be communicated with the expansion valve assembly 7. A second valve assembly 6 is disposed on the end of the gaseous coolant line 4 proximate to the heat exchanger 2 for controlling the gaseous coolant line 4 to communicate with itself or for controlling the gaseous coolant line 4 to communicate with the compressor assembly 8.

It should be noted that the heat exchange inlet and the heat exchange outlet on the back plate 201 of the cabinet 200 can be respectively communicated with the liquid coolant pipeline 3 and the gaseous coolant pipeline 4 through the quick connector 9. After the liquid coolant (e.g., chilled water) in the liquid coolant pipeline 3 flows into the heat exchange inlet of the back plate 201, the heat load of the hot airflow blown out from the cabinet 200 is absorbed. After absorbing heat, the liquid coolant is converted into gaseous coolant, flows into the gaseous coolant pipeline 4 from the heat exchange outlet of the back plate 201, is conveyed back to the heat exchanger 2 through the gaseous coolant pipeline 4 to be condensed into liquid coolant, and is continuously conveyed back to the liquid coolant pipeline 3 to perform circulating heat exchange.

The first valve assembly 5 of the gravity heat pipe unit 100 of the embodiment of the present invention may not be physically connected to the expansion valve assembly 7 in advance, and the second valve assembly 6 may not be physically connected to the compressor assembly 8 in advance. Namely, the expansion valve assembly 7 and the compressor assembly 8 are used as redundant assemblies and then configured when needed, so that the space of the gravity heat pipe unit 100 is saved. As shown in fig. 1, when the gravity assisted heat pipe unit 100 of this embodiment is not connected to the expansion valve assembly 7 and the compressor assembly 8, it is possible to provide a cooling load to each cabinet 200 in the data center room, and reduce the ambient temperature of the room and the cabinet 200. As shown in fig. 2, when the gravity heat pipe unit 100 is connected with the expansion valve assembly 7 and the compressor assembly 8 at the same time, it is possible to further increase the cooling load provided by the gravity heat pipe unit 100 connected with the expansion valve assembly 7 and the compressor assembly 8, and at the same time, enhance the circulation efficiency of the coolant, i.e., the ambient temperature of the machine room and the cabinet 200 can become lower, so that when any one of the gravity heat pipe units 100 or the back panel 201 of any one of the cabinets 200 fails, the reduction in the ambient temperature of the machine room can indirectly provide the cooling load for the cabinet 200 connected with the damaged gravity heat pipe unit 100, so as to maintain the temperature of the machine room stable.

In one implementation, as shown in fig. 2, the expansion valve assembly 7 includes a throttling element 71, and the throttling element 71 is connected to the first valve assembly 5 for reducing the temperature, pressure, and flow of the coolant in the liquid coolant line 3. The connection of the throttling element 71 to the first valve assembly 5 can be understood to be, in operation, communicating the liquid coolant line 3 with the throttling element 71 through the first valve assembly 5, thereby causing the throttling element 71 to cool, depressurize, and throttle coolant flowing through the liquid coolant line 3.

In one example, as shown in FIG. 3, the first valve assembly 5 includes a first main valve 51 disposed on the liquid coolant line 3, and a first branch 52 and a second branch 53 are disposed on either side of the first main valve 51 for communicating with the liquid coolant line 3. The first branch 52 is provided with a first bypass valve 54, and the second branch 53 is provided with a second bypass valve 55. The first bypass valve 54 and the second bypass valve 55 are used for connecting the expansion valve assembly 7. When the expansion valve assembly 7 includes the throttling part 71, the first bypass valve 54 and the second bypass valve 55 are connected to both ends of the throttling part 71, respectively (for example, the first bypass valve 54 is connected to an input end of the throttling part 71, and the second bypass valve 55 is connected to an output end of the throttling part 71).

The first valve assembly 5 has a first state and a second state, and the first state and the second state can be switched. The first valve assembly 5, when in the first state, controls the first main valve 51 to open and the first bypass valve 52 and the second bypass valve 53 to close, allowing the liquid coolant line 3 to self-communicate. The first valve assembly 5, when in the second state, controls the first main valve 51 to close and the first bypass valve 52 and the second bypass valve 53 to open to communicate the liquid coolant line 3 with the expansion valve assembly 7.

In one implementation, as shown in FIG. 2, the compressor package 8 includes a plenum member 81, and the plenum member 81 is coupled to the second valve assembly 6 for increasing the efficiency of the coolant cycle in the gaseous coolant line 4. The connection of the plenum member 81 to the second valve assembly 6 can be understood to be the operative connection of the gaseous coolant lines 4 to the plenum member 81 through the second valve assembly 6 such that the efficiency of the cycle in which the plenum member 81 will flow through the coolant in the gaseous coolant lines 4 is enhanced.

In one example, as shown in FIG. 4, the second valve assembly 6 includes a second main valve 61 disposed on the gaseous coolant line 4, with a third branch 62 and a fourth branch 63 disposed on either side of the second main valve 61 and communicating with the gaseous coolant line 4. A third bypass valve 64 is provided in the third branch 62, and a fourth bypass valve 65 is provided in the fourth branch 63. A third bypass valve 64 and a fourth bypass valve 65 are used to connect the compressor assembly 8. When the compressor assembly 8 includes the pressure increasing member 81, the third bypass valve 64 and the fourth bypass valve 65 are respectively connected to two ends of the pressure increasing member 81 (for example, the third bypass valve 64 is connected to an input end of the pressure increasing member 81, and the fourth bypass valve 65 is connected to an output end of the pressure increasing member 81).

The second valve assembly 6 has a first state and a second state, and the first state and the second state can be switched. The second valve assembly 6 is operable to control the second main valve 61 to open and the third and

fourth bypass valves

64 and 65 to close when in the first state to allow the gaseous coolant line 4 to self-communicate. In the second state, the second main valve 61 is controlled to be closed and the third and

fourth bypass valves

64 and 65 are opened to place the gaseous coolant line 4 in communication with the compressor assembly 8.

It should be noted that the first valve component 5 and the second valve component 6 need to be in the same state, i.e. when the first valve component 5 is in the first state, the second valve component 6 should also be in the first state. When the first valve assembly 5 is in the second state, the second valve assembly 6 should also be in the second state. Therefore, the expansion valve assembly 7 and the compressor assembly 8 in the same gravity heat pipe unit 100 can work simultaneously, the evaporation temperature of the coolant in the circulation pipeline of the gravity heat pipe unit 100 can be reduced, the circulation efficiency is increased, and the cooling load provided by the gravity heat pipe unit 100 is further improved.

In one implementation, as shown in fig. 5, the compressor assembly 8 further includes a gas-liquid separator 82 connected to the pressure increasing member 81, and an inlet end of the gas-liquid separator 82 and an outlet end of the pressure increasing member 81 are respectively connected to the second valve assembly 6. The gas-liquid separator 82 is used to filter the incompletely vaporized liquid in the gaseous coolant pipeline 4, so as to prevent the liquid from entering the pressurizing member 81 and causing liquid impact on the pressurizing member 81. Preferably, the pressurizing member 81 may employ a low pressure ratio compressor. When the compressor unit 8 includes the pressurizing member 81 and the gas-liquid separator 82, the third bypass valve 64 is connected to the pressurizing member 81, and the fourth bypass valve 65 is connected to the gas-liquid separator 82.

In a variant, the pressurizing part 81 can also be replaced by an air pump.

As shown in FIG. 2, to achieve quick replacement and connection of the components of gravity heat pipe unit 100, first valve assembly 5 is connected to expansion valve assembly 7 via quick-connect fitting 9, and second valve assembly 6 is connected to compressor assembly 8 via quick-connect fitting 9.

For example, when the apparatus is normal, the first main valve 51 is opened, and the first valve assembly 5 is in the first state. When the first main valve 51 is closed, the first bypass valve 52 and the second bypass valve 53 are opened, and the first valve assembly 5 is in the second state, the quick connector 9 is connected to the expansion valve assembly 7 and the quick connector 9 of the compressor assembly 8, respectively, to perform the bypass function.

Based on the air conditioning system of any one of the embodiments or implementation manners, the embodiment of the invention further provides a refrigeration method of the air conditioning system, and the method can be used for controlling the air conditioning system with any one of the structures in the embodiments. The method may comprise the steps of:

when a failure of one of the gravity heat pipe units 100 is detected, the first valve assembly 5 is controlled on the liquid coolant line 3 of the other gravity heat pipe unit 100 to connect the expansion valve assembly 7, and the second valve assembly 6 is controlled on the gaseous coolant line 4 to connect the compressor assembly 8.

The expansion valve assembly 7 and the compressor assembly 8 act together to increase the cooling load provided by another gravity assisted heat pipe unit 100, so as to indirectly exchange heat with the gas at the back plate 201 of each cabinet 200 connected with the failed gravity assisted heat pipe unit 100, thereby ensuring the temperature stability of the machine room.

For example, as shown in fig. 2, when the heat exchanger 2 (heat exchanger E) of the first gravity heat pipe unit 100 fails and cannot provide a cooling load to the cabinet 200 (cabinet a and cabinet C) connected thereto, the expansion valve assembly 7 and the compressor assembly 8 are connected to the upper portion of the second gravity heat pipe unit 100, so that the temperature of the coolant in the circulation loop of the second gravity heat pipe unit 100 is reduced, and thus more cooling load is provided to the room environment, and the heat load of the cabinet 200 (cabinet a and cabinet C) is balanced, thereby ensuring the stability of the room temperature.

In one implementation, the method further comprises: when a failure of the backplane 201 of any of the cabinets 200 is detected, an expansion valve assembly 7 is provided on the liquid coolant line 3 of at least one gravity heat pipe unit 100 that is not connected to the failed backplane 201, and a compressor assembly 8 is provided on the gaseous coolant line 4.

For example, as shown in fig. 2, when the cabinet 200 (cabinet a) connected to the first gravity heat pipe unit 100 fails, the expansion valve assembly 7 and the compressor assembly 8 are connected to the upper portion of the second gravity heat pipe unit 100, so that the temperature of the coolant in the circulation loop of the second gravity heat pipe unit 100 is reduced, and thus more cooling load is provided to the room environment, and the heat load of the cabinet 200 (cabinet a) is balanced, thereby ensuring the stability of the room temperature.

In one implementation, the method further comprises: when a failure of the back plane 201 of any of the cabinets 200 is detected, an expansion valve assembly 7 is provided on the liquid coolant line 3 of the gravity heat pipe unit 100 connected to the failed back plane 201, and a compressor assembly is provided on the gaseous coolant line 4.

For example, as shown in fig. 2, when the cabinet 200 (cabinet a) connected to the first gravity heat pipe unit 100 fails, the expansion valve assembly 7 and the compressor assembly 8 are connected to the upper portion of the first gravity heat pipe unit 100, so that the coolant temperature in the circulation loop of the first gravity heat pipe unit 100 is reduced, and thus more cooling load is provided to the room environment, and the heat load of the cabinet 200 (cabinet a) is balanced, thereby ensuring the stability of the room temperature.

In the method embodiment of the present invention, which gravity heat pipe unit 100 is provided with the expansion valve assembly 7 and the compressor assembly 8 can be adaptively adjusted according to the working requirements. But need to be located on the same gravity heat pipe unit 100 at the same time.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various changes or substitutions within the technical scope of the present invention, and these should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An air conditioning system comprises a plurality of gravity heat pipe units, and is characterized in that the gravity heat pipe units comprise heat exchangers, liquid secondary refrigerant pipelines and gaseous secondary refrigerant pipelines, wherein the heat exchangers are respectively connected with back plates of all equipment cabinets through the liquid secondary refrigerant pipelines and the gaseous secondary refrigerant pipelines to form a circulation loop;

the gravity heat pipe unit further comprises a first valve assembly and a second valve assembly, wherein the first valve assembly is arranged at one end, close to the heat exchanger, of the liquid secondary refrigerant pipeline and is used for controlling the liquid secondary refrigerant pipeline to be communicated with the expansion valve assembly in a self-communication mode or controlling the liquid secondary refrigerant pipeline to be communicated with the expansion valve assembly; the second valve assembly is arranged at one end, close to the heat exchanger, of the gaseous secondary refrigerant pipeline and is used for controlling the gaseous secondary refrigerant pipeline to be communicated with the compressor assembly in a self-communication mode or controlling the gaseous secondary refrigerant pipeline to be communicated with the compressor assembly;

the air conditioning system is provided with a first connection state, wherein the first connection state is that under the condition that any one gravity heat pipe unit is in failure, the first valve component of at least one other gravity heat pipe unit is communicated with the expansion valve component, and the second valve component is communicated with the compressor component.

2. The air conditioning system of claim 1, wherein said expansion valve assembly includes a throttling member connected to said first valve assembly for reducing the temperature, pressure and flow of the coolant in said liquid coolant line.

3. The air conditioning system of claim 1, wherein said compressor assembly includes a boost member connected to said second valve assembly for increasing the efficiency of the cycle of the coolant in said gaseous coolant line.

4. The air conditioning system as claimed in claim 3, wherein the compressor assembly further comprises a gas-liquid separator connected to the pressurizing member, and an inlet end of the gas-liquid separator and an outlet end of the pressurizing member are connected to the second valve assembly, respectively.

5. An air conditioning system according to claim 1, wherein said first valve assembly comprises a first main valve disposed in said liquid coolant line, a first branch and a second branch disposed on either side of said first main valve for communicating with said liquid coolant line, a first bypass valve disposed in said first branch, and a second bypass valve disposed in said second branch, said first and second bypass valves being adapted to be connected to said expansion valve assembly.

6. The air conditioning system of claim 5, wherein the first valve assembly is configured to control the first main valve to open when in the first state, and the first and second bypass valves are closed to allow the liquid coolant line to be self-communicating; when in the second state, the first main valve is controlled to be closed, and the first bypass valve and the second bypass valve are controlled to be opened, so that the liquid coolant pipeline is communicated with the expansion valve assembly.

7. The air conditioning system as claimed in claim 5, wherein the first bypass valve and the second bypass valve are connected to both ends of the throttling part of the expansion valve assembly, respectively.

8. An air conditioning system as recited in claim 1 wherein said second valve assembly comprises a second main valve disposed in said gaseous coolant line, a third bypass valve disposed in said third branch and a fourth bypass valve disposed in said fourth branch, said third and fourth bypass valves being connected to said compressor assembly, said third and fourth bypass valves being disposed in said second main valve on opposite sides of said second main valve.

9. The air conditioning system as recited in claim 8 wherein said second valve assembly is adapted to control said second main valve to open when in the first state, and said third and fourth bypass valves are closed to allow said gaseous coolant line to be self-communicating; in a second state, the second main valve is controlled to close, and the third and fourth bypass valves are controlled to open to place the gaseous coolant line in communication with the compressor assembly.

10. The air conditioning system as claimed in claim 8, wherein the third bypass valve and the fourth bypass valve are connected to both ends of a pressurizing part of the compressor assembly, respectively.

11. An air conditioning system as claimed in any of claims 1 to 10, wherein said first valve component is connected to said expansion valve component by a quick connector and said second valve component is connected to said compressor component by said quick connector.

12. The refrigeration method of the air conditioning system is characterized in that the air conditioning system comprises a plurality of gravity heat pipe units, each gravity heat pipe unit comprises a heat exchanger, a liquid secondary refrigerant pipeline and a gaseous secondary refrigerant pipeline, and the heat exchangers are respectively connected with the back plates of all equipment cabinets through the liquid secondary refrigerant pipelines and the gaseous secondary refrigerant pipelines to form a circulation loop; the method comprises the following steps:

in the event of detecting a failure of any one of the gravity heat pipe units, controlling a first valve assembly on the liquid coolant line of at least one other of the gravity heat pipe units to be connected to an expansion valve assembly and a second valve assembly on the gaseous coolant line to be connected to a compressor assembly;

13. The air conditioning system refrigeration method as set forth in claim 12, further including: