Sealed heat dissipation device of electrical equipment and working method of sealed heat dissipation device

Abstract

The invention discloses a sealed heat dissipation device of electrical equipment and a working method of the sealed heat dissipation device. The heat dissipation device comprises an external heat dissipation assembly, an internal cooling assembly and a loop heat pipe. Wherein the external heat dissipation chamber is used for dissipating heat to the outside, the internal cooling chamber is used for transferring cold energy to a heat source, the loop heat pipe serves as a heat exchange medium to transfer the heat energy and the cold energy, and therefore heat dissipation and cooling of the heat source are achieved; moreover, the external heat dissipation chamber and the internal cooling chamber are physically isolated, so that external dust can be prevented from entering the heat source from the internal cooling chamber to influence the electronic equipment. The invention relates to the technical field of electrical cabinets.

Description

Technical Field

[0001] The present application relates to the technical field of electrical cabinets, and particularly relates to a sealed heat dissipation device for electrical equipment and its working method. Background Art

[0002] In modern power systems, switchgear is used to control and protect power transmission. When abnormal conditions such as overload or short circuit occur in the power system, the switchgear can cut off the circuit in time to protect the safety of the power grid and prevent equipment damage. A switchyard is a power facility with switchgear as the main equipment, which can protect a larger range of the power grid compared to a single switchgear. However, due to the poor heat dissipation conditions inside the switchgear and the high internal temperature, it may cause the switchgear to trip falsely and result in regional power outages. Therefore, finding a heat dissipation method for switchgear (switchyard) is of great significance for the safe and stable operation of the power system.

[0003] Currently, the main heat dissipation method for switchgear is to extract the hot air inside the cabinet through an external fan, and the external cold air enters the cabinet through the heat dissipation holes on the cabinet door, forming convective heat transfer inside the switchgear. However, this method is prone to cause dust accumulation inside the cabinet and reduce the operating reliability of the switchgear.

[0004] Therefore, how to avoid external dust from entering the switchgear and affecting the normal operation of electronic equipment while ensuring the heat dissipation effect of the switchgear is a technical problem that urgently needs to be solved in the current design of the electrical cabinet heat dissipation system. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present application provides a sealed heat dissipation device for electrical equipment, which can dissipate heat from the switchgear and at the same time prevent external dust from entering the switchgear and affecting the normal operation of electronic equipment.

[0006] The present application also provides a working method for the above-mentioned sealed heat dissipation device for electrical equipment.

[0007] According to an embodiment of the first aspect of the present application, the sealed heat dissipation device for electrical equipment includes:

[0008] An external heat dissipation component, which includes an external heat dissipation chamber and a first fan. The external heat dissipation chamber is provided with a first opening communicating with the outside world, and the first fan is installed in the external heat dissipation chamber and discharges the hot air through the first opening;

[0009] An internal cooling component, which includes an internal cooling chamber and a second fan. The internal cooling chamber is provided with a second opening and a third opening communicating with the heat source. The second fan is installed in the internal cooling chamber and discharges the cold air through the second opening to the heat source, and the hot air of the heat source enters the internal cooling chamber through the third opening;

[0010] A loop heat pipe penetrates through the external heat dissipation chamber and the internal cooling chamber at both ends respectively, and a heat transfer working fluid flows in the loop heat pipe;

[0011] Wherein, the external heat dissipation chamber and the internal cooling chamber are physically isolated.

[0012] The sealed heat dissipation device of the electrical equipment according to the embodiment of the present application has at least the following beneficial effects: the external heat dissipation chamber is used to dissipate heat to the outside world, the internal cooling chamber is used to transfer cold to the heat source, and the loop heat pipe is used as a heat transfer medium to transfer heat and cold, thereby realizing the heat dissipation and cooling of the heat source; moreover, the physical isolation between the external heat dissipation chamber and the internal cooling chamber can prevent external dust from entering the heat source through the internal cooling chamber and affecting the electronic equipment.

[0013] According to some embodiments of the present application, an external radiator is installed at the first opening, an internal radiator is installed at the third opening, one end of the loop heat pipe is connected to the external radiator, and the other end of the loop heat pipe is connected to the internal radiator.

[0014] According to some embodiments of the present application, both the external radiator and the internal radiator are parallel flow channel type radiators. The parallel flow channel type radiator includes a heat dissipation cavity and a plurality of fins arranged in the heat dissipation cavity. The gaps between the fins form flow channels. An air inlet and a liquid outlet are provided in the heat dissipation cavity. The gaseous heat transfer working fluid enters the heat dissipation cavity through the air inlet and flows in each flow channel. The gaseous heat transfer working fluid is condensed by heat exchange to form a liquid heat transfer working fluid and flows out through the liquid outlet.

[0015] According to some embodiments of the present application, the fins are divided into a plurality of fin groups along the x direction, and a gap is left between adjacent fin groups to form the flow channel.

[0016] According to some embodiments of the present application, a gas collecting pipe and a liquid collecting pipe are further arranged in the heat dissipation cavity. The air inlet is located in the gas collecting pipe, the liquid outlet is located in the liquid collecting pipe, and both ends of each flow channel are respectively communicated with the gas collecting pipe and the liquid collecting pipe.

[0017] According to some embodiments of the present application, the heat transfer working fluid in the loop heat pipe is R134a.

[0018] According to some embodiments of the present application, the pipe material of the loop heat pipe is red copper pipe.

[0019] According to some embodiments of the present application, the heat source is a switch cabinet. The external heat dissipation chamber and the internal cooling chamber are both installed on one side of the switch cabinet, and a partition is arranged between the external heat dissipation chamber and the internal cooling chamber for isolation.

[0020] According to some embodiments of the present application, the heat source is a switch station, a plurality of switch cabinets are arranged in the switch station, the external heat dissipation chamber is installed outside the switch station, the number of the internal cooling chambers is the same as that of the switch cabinets and they are arranged in one-to-one correspondence, and the loop heat pipes led out from each of the internal cooling chambers converge to the external heat dissipation chamber.

[0021] A working method of the sealed heat dissipation device for the electrical equipment according to the second aspect embodiment of the present application includes:

[0022] The heat source emits heat, and hot air enters the internal cooling chamber from the third opening;

[0023] The loop heat pipe is heated, and the heat transfer working fluid therein absorbs heat and evaporates to be converted into a gaseous state;

[0024] The gaseous heat transfer working fluid carries the heat and flows along the loop heat pipe to the external heat dissipation chamber, and the heat is transferred to the air in the external heat dissipation chamber;

[0025] The first fan blows the air in the external heat dissipation chamber to the outside world, and the heat of the heat transfer working fluid is dissipated and re-condensed into a liquid state;

[0026] The liquid heat transfer working fluid carries the cold quantity and flows along the loop heat pipe to the internal cooling chamber, and the cold quantity is transferred to the air in the internal cooling chamber;

[0027] The second fan blows the air in the internal cooling chamber towards the heat source, and the cold quantity is transferred to the heat source to achieve a cooling effect;

[0028] The above steps are cycled to continuously dissipate heat and cool the heat source.

[0029] Some additional aspects and advantages of the present application will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are used to provide a further understanding of the technical solutions disclosed in the present application, and constitute a part of the specification. Together with the embodiments disclosed in the present application, they are used to explain the technical solutions of the present disclosure, and do not constitute a limitation on the technical solutions disclosed in the present application.

[0031] Figure 1 It is a schematic diagram of installing the sealed heat dissipation device for the electrical equipment according to the first aspect embodiment of the present application to the switch cabinet;

[0032] Figure 2 It is the front view of the sealed heat dissipation device for the electrical equipment according to the first aspect embodiment of the present application;

[0033] Figure 3 This is a cross-sectional view of the parallel flow channel type radiator in the sealed heat dissipation device of the electrical equipment according to the embodiment of the first aspect of the present application;

[0034] Figure 4 This is a schematic diagram of installing the sealed heat dissipation device of the electrical equipment according to the embodiment of the first aspect of the present application to the switchyard;

[0035] Figure 5 This is a front view of the internal cooling chamber in the sealed heat dissipation device of the electrical equipment according to the embodiment of the first aspect of the present application;

[0036] Figure 6 This is a side view of the internal cooling chamber in the sealed heat dissipation device of the electrical equipment according to the embodiment of the first aspect of the present application.

[0037] Reference numerals: 110 - external heat dissipation chamber, 120 - first fan, 130 - external radiator, 210 - internal cooling chamber, 220 - second fan, 230 - internal radiator, 300 - loop heat pipe, 410 - heat dissipation cavity, 411 - air inlet, 412 - liquid outlet, 420 - fin, 430 - flow channel, 440 - gas collecting pipe, 450 - liquid collecting pipe. Detailed Description of the Embodiment

[0038] The following details the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0039] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0040] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0041] In the description of this application, unless otherwise clearly defined, terms such as "setting", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution.

[0042] In the description of this application, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0043] In modern power systems, switchgear is used to control and protect power transmission. When abnormal conditions such as overload or short circuit occur in the power system, the switchgear can cut off the circuit in time to protect the safety of the power grid and prevent equipment damage. A switch station is a power facility with switchgear as the main equipment, which can protect a larger range of the power grid compared with a single switchgear. However, due to the poor heat dissipation conditions inside the switchgear and the relatively high internal temperature, it may cause the switchgear to trip erroneously and result in regional power outages. Therefore, finding a heat dissipation method for switchgear (stations) is of great significance for the safe and stable operation of power systems.

[0044] Currently, the main heat dissipation method for switchgear is to extract the hot air inside the cabinet through an external fan, and the external cold air enters the cabinet through the heat dissipation holes on the cabinet door to form convective heat transfer inside the switchgear. However, this method is prone to cause dust accumulation inside the cabinet and reduce the operating reliability of the switchgear.

[0045] Therefore, how to avoid external dust from entering the switchgear and affecting the normal operation of electronic equipment on the premise of ensuring the heat dissipation effect of the switchgear is a technical problem that urgently needs to be solved in the design of the current electrical cabinet heat dissipation system.

[0046] In response to this, this application proposes a sealed heat dissipation device for electrical equipment and its working method. In this device, the external heat dissipation chamber 110 is used to dissipate heat to the outside world, the internal cooling chamber 210 is used to transfer cold to the heat source, and the loop heat pipe 300 is used as a heat transfer medium to transfer heat and cold, thereby realizing the heat dissipation and cooling of the heat source; moreover, the external heat dissipation chamber 110 and the internal cooling chamber 210 are physically isolated, which can prevent external dust from entering the heat source through the internal cooling chamber 210 and affecting the electronic equipment.

[0047] Refer to Figure 1 and Figure 2, the sealed heat dissipation device of the electrical equipment in the first aspect embodiment of the present application includes an external heat dissipation component, an internal cooling component, and a loop heat pipe 300. Among them, the external heat dissipation component is used to dissipate the heat generated by the heat source to the outside, the internal cooling component is used to output the cold quantity from the outside to the heat source to cool it, and the loop heat pipe 300 is arranged between the external heat dissipation component and the internal cooling component for heat and cold quantity transfer. In the present application, the heat source refers to a switch cabinet or a switch station containing multiple switch cabinets, and the electronic devices therein will dissipate heat during operation.

[0048] Specifically, the external heat dissipation component includes an external heat dissipation chamber 110 and a first fan 120. The external heat dissipation chamber 110 is provided with a first opening communicating with the outside, and the first fan 120 is installed in the external heat dissipation chamber 110 and discharges the hot air through the first opening. Thus, driven by the first fan 120, the heat in the external heat dissipation chamber 110 can be dissipated to the outside along with the hot air.

[0049] The internal cooling component includes an internal cooling chamber 210 and a second fan 220. The internal cooling chamber 210 is provided with a second opening and a third opening communicating with the heat source. The second fan 220 is installed in the internal cooling chamber 210 and discharges the cold air to the heat source through the second opening, and the hot air of the heat source enters the internal cooling chamber 210 through the third opening. Thus, driven by the second fan 220, the cold quantity in the internal cooling chamber 210 can enter the heat source along with the cold air for cooling. At the same time, the hot air generated by the heat source can also enter the internal cooling chamber 210 from the third opening.

[0050] Both ends of the loop heat pipe 300 penetrate into the external heat dissipation chamber 110 and the internal cooling chamber 210 respectively, and a heat transfer working fluid flows in the loop heat pipe 300. The heat transfer working fluid will evaporate and turn into a gas after absorbing heat, and will condense and turn into a liquid after releasing heat. The heat transfer working fluid circulates in the loop heat pipe 300 to absorb and release heat, so as to switch back and forth between gas and liquid.

[0051] Among them, it is worth noting that the external heat dissipation chamber 110 and the internal cooling chamber 210 are physically isolated, so as to prevent the dust in the external heat dissipation chamber 110 from entering the internal cooling chamber 210 and finally entering the heat source to affect the electronic devices therein. Further, a sealing structure, such as a sealing ring, a sealing gasket or a sealing structure formed by glue, can be provided at the connection of the loop heat pipe 300 with the external heat dissipation chamber 110 and the internal cooling chamber 210, thereby preventing dust from entering the internal cooling chamber from the gap.

[0052] Further, an external radiator 130 is installed at the first opening, and an internal radiator 230 is installed at the third opening. One end of the loop heat pipe 300 is connected to the external radiator 130, and the other end of the loop heat pipe 300 is connected to the internal radiator 230. The functions of the external radiator 130 and the internal radiator 230 are to increase the contact area between the loop heat pipe 300 and the external air, thereby improving the heat exchange efficiency.

[0053] Specifically, referring to Figure 3 , both the external radiator 130 and the internal radiator 230 are parallel flow channel type radiators. The parallel flow channel type radiator includes a heat dissipation cavity 410 and a plurality of fins 420 disposed in the heat dissipation cavity 410. A heat exchange medium flows in the heat dissipation cavity 410, and the fins 420 are used to increase the contact area between it and the air. The gaps between the respective fins 420 form flow channels 430. The heat dissipation cavity 410 is provided with an air inlet and a liquid outlet. The gaseous heat exchange working fluid enters the heat dissipation cavity 410 through the air inlet and flows in the respective flow channels 430. The gaseous heat exchange working fluid is condensed through heat exchange to form a liquid heat exchange working fluid and flows out from the liquid outlet.

[0054] Further, the fins 420 are divided into a plurality of fin groups along the x direction (referring to the arrow direction in Figure 3 ), and a gap is left between two adjacent fin groups to form the flow channels 430. Thus, the respective flow channels 430 are linear and arranged side by side with each other. The linear flow channels 430 can reduce the turbulent flow generated when the heat exchange working fluid flows in the flow channels 430, and the arrangement of the plurality of flow channels 430 side by side can also improve the flow efficiency of the heat exchange working fluid.

[0055] Further, a gas collecting pipe 440 and a liquid collecting pipe 450 are further disposed in the heat dissipation cavity 410. The air inlet 411 is located in the gas collecting pipe 440, and the liquid outlet is located in the liquid collecting pipe 450. Both ends of the respective flow channels 430 are communicated with the gas collecting pipe 440 and the liquid collecting pipe 450 respectively. The heat exchange working fluid enters through the air inlet 411 and first converges in the gas collecting pipe 440, and then flows into the respective flow channels 430. After the heat exchange working fluid is condensed into a liquid state in the respective flow channels 430, it converges in the liquid collecting pipe 450, and then flows outwards through the liquid outlet 412.

[0056] Further, the heat exchange working fluid in the loop heat pipe 300 is R134a. The boiling point of R134a at a standard atmospheric pressure is -26.1 °C, and the pressure is appropriate, making it suitable as the heat exchange working fluid of the loop heat pipe 300.

[0057] Further, the pipe material of the loop heat pipe 300 is red copper pipe. The red copper pipe has good thermal conductivity, thereby being able to improve the heat exchange efficiency of the loop heat pipe 300.

[0058] In some embodiments, the heat source is a switch cabinet. Referring to Figure 1 and Figure 2, both the external heat dissipation chamber 110 and the internal cooling chamber 210 are installed on one side of the switchgear. A partition is provided between the external heat dissipation chamber 110 and the internal cooling chamber 210 to block the flow of dust.

[0059] In some other embodiments, the heat source is a switchyard. Referring to Figures 4 to 6 , multiple switchgears are provided in the switchyard. The external heat dissipation chamber 110 is installed outside the switchyard. The number of internal cooling chambers 210 is the same as and corresponds one-to-one to the number of switchgears. The loop heat pipes 300 led out from each internal cooling chamber 210 converge to the external heat dissipation chamber 110.

[0060] A working method of a sealed heat dissipation device for the above-mentioned electrical equipment according to an embodiment of the second aspect of the present application includes the following steps:

[0061] S100. The heat source emits heat, and the hot air enters the internal cooling chamber 210 from the third opening;

[0062] S200. The loop heat pipe 300 is heated, and the heat transfer working fluid therein absorbs heat and evaporates to be converted into a gas state;

[0063] S300. The gaseous heat transfer working fluid carries the heat and flows along the loop heat pipe 300 into the external heat dissipation chamber 110, and the heat is transferred to the air in the external heat dissipation chamber 110;

[0064] S400. The first fan 120 blows the air in the external heat dissipation chamber 110 to the outside, and the heat of the heat transfer working fluid is dissipated and re-condensed into a liquid state;

[0065] S500. The liquid heat transfer working fluid carries the cold quantity and flows along the loop heat pipe 300 into the internal cooling chamber 210, and the cold quantity is transferred to the air in the internal cooling chamber 210;

[0066] S600. The second fan 220 blows the air in the internal cooling chamber 210 towards the heat source, and the cold quantity is transferred to the heat source to achieve a cooling effect;

[0067] S700. The above steps are cycled to continuously dissipate heat and cool the heat source.

[0068] The above has described the embodiments of the present application in detail with reference to the drawings. However, the present application is not limited to the above embodiments. Various changes can be made without departing from the gist of the present application within the knowledge scope of those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A sealed heat dissipation device for electrical equipment, characterized in that: include: An external heat dissipation component comprises an external heat dissipation chamber and a first fan, wherein the external heat dissipation chamber is provided with a first opening communicating with the outside, and the first fan is installed in the external heat dissipation chamber and discharges hot air through the first opening; An internal cooling assembly comprises an internal cooling chamber and a second fan, wherein the internal cooling chamber is provided with a second opening and a third opening connected to a heat source, the second fan is installed in the internal cooling chamber and discharges cold air to the heat source through the second opening, and hot air from the heat source enters the internal cooling chamber through the third opening; A loop heat pipe, two ends of which respectively penetrate the external heat dissipation chamber and the internal cooling chamber, and a heat exchange medium flows in the loop heat pipe; Wherein, the external heat dissipation chamber and the internal cooling chamber are physically isolated.

2. The sealed heat dissipation device for electrical equipment according to claim 1, characterized in that: The first opening is installed with an external radiator, the third opening is installed with an internal radiator, one end of the loop heat pipe is connected to the external radiator, and the other end of the loop heat pipe is connected to the internal radiator.

3. The sealed heat dissipation device for electrical equipment according to claim 2, characterized in that: The external radiator and the internal radiator are both parallel flow channel type radiators, and the parallel flow channel type radiator includes a heat dissipation cavity and a plurality of fins arranged in the heat dissipation cavity, and the gaps between the fins form flow channels. The heat dissipation cavity is provided with an air inlet and a liquid outlet. The gaseous heat exchange medium enters the heat dissipation cavity from the air inlet and flows in each of the flow channels. The gaseous heat exchange medium is condensed through heat exchange to form a liquid heat exchange medium and flows out from the liquid outlet.

4. The sealed heat dissipation device for electrical equipment according to claim 3, characterized in that: The fins are divided into a plurality of fin groups along the x direction, and a gap is left between two adjacent fin groups to form the flow channel.

5. The sealed heat dissipation device for electrical equipment according to claim 4, characterized in that: An air collecting pipe and a liquid collecting pipe are also provided in the heat dissipation cavity. The air inlet is located in the air collecting pipe, the liquid outlet is located in the liquid collecting pipe, and both ends of each of the flow channels are connected to the air collecting pipe and the liquid collecting pipe respectively.

6. The sealed heat dissipation device for electrical equipment according to claim 1, characterized in that: The heat exchange medium in the loop heat pipe is R134a.

7. The sealed heat dissipation device for electrical equipment according to claim 1, characterized in that: The tube material of the loop heat pipe is a copper tube.

8. The sealed heat dissipation device for electrical equipment according to any one of claims 1 to 7, characterized in that: The heat source is a switch cabinet, the external heat dissipation chamber and the internal cooling chamber are both installed on one side of the switch cabinet, and a partition is provided between the external heat dissipation chamber and the internal cooling chamber for separation.

9. The sealed heat dissipation device for electrical equipment according to any one of claims 1 to 7, characterized in that: The heat source is a switch station, and a plurality of switch cabinets are arranged in the switch station. The external heat dissipation chamber is installed on the outside of the switch station. The number of the internal cooling chambers is consistent with the number of the switch cabinets and is arranged one-to-one. The loop heat pipes led out from each of the internal cooling chambers are collected in the external heat dissipation chamber.

10. A method for operating the sealed heat dissipation device of any one of claims 1 to 9, characterized in that: include: The heat source emits heat, and hot air enters the internal cooling chamber from the third opening; The loop heat pipe is heated, and the heat exchange medium therein absorbs heat, evaporates, and is converted into a gaseous state; The gaseous heat exchange medium carries heat and flows along the loop heat pipe into the external heat dissipation chamber, and the heat is transferred to the air in the external heat dissipation chamber; The first fan blows the air in the external heat dissipation chamber to the outside, and the heat of the heat exchange medium is dissipated and re-condensed into a liquid state; The liquid heat exchange medium carries cold energy and flows along the loop heat pipe into the internal cooling chamber, and the cold energy is transferred to the air in the internal cooling chamber; The second fan blows the air in the internal cooling chamber toward the heat source, and the cold air is transferred to the heat source to achieve a cooling effect; The above steps are repeated in a cycle to continuously dissipate heat and cool the heat source.

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