Heat pipe type tail end bus

Abstract

The utility model discloses a heat pipe type tail end bus which comprises a copper bar and a heat pipe type shell, and an insulating film layer is arranged between the copper bar and the heat pipe type shell. The heat pipe type shell between the adjacent copper bars is provided with a closed heat dissipation cavity extending along the length direction of the heat pipe type shell, a cooling agent is injected into the heat dissipation cavity, the injection amount of the cooling agent is smaller than the volume of the heat dissipation cavity, and a cavity above the liquid level of the cooling agent in the heat dissipation cavity is in a vacuum state. The beneficial effects of the utility model are that the heat dissipation effect of the copper bar located in the middle is effectively improved. Heat generated by the middle copper bar is rapidly absorbed through evaporation phase change of cooling liquid and conducted to the heat dissipation fins for cooling in a steam mode, in the cooling process, steam is subjected to phase change again to be condensed into liquid, the liquid flows back to the bottom of the heat dissipation cavity through gravity, efficient conduction of the heat is achieved through phase change circulation, and the heat dissipation efficiency is improved. The heat dissipation effect and the specific heat capacity of the coolant are further improved, and the heat emitted by the copper bar can be efficiently and rapidly conducted to the external environment.

Description

Technical Field

[0001] The utility model relates to a terminal busbar, in particular to a heat pipe type terminal busbar, and belongs to the technical field of power distribution equipment. Background Art

[0002] The terminal distribution busbar is a power distribution and transmission system for terminal electrical equipment, which is composed of metal plates, steel plates or aluminum plates as protective shells, conductive bars, insulating materials and related accessories.

[0003] With the development of communication and computer technology, the power demand for the terminal distribution bus is getting higher and higher. The main application scenarios include computing power rooms, liquid cooling rooms, etc. The power demand of a single cabinet in the room can reach 48KW or higher, which is much higher than the traditional demand of about 10KW. The current of the high-power terminal bus can reach 1250A, and the single-channel output capacity of the output unit can reach 100A and support multi-channel output requirements; the miniaturized design of the output unit can support the installation of more output units on the bus.

[0004] The terminal busbar copper bar and the shell are usually insulated by air or insulating materials. The national standard stipulates the temperature rise standard of the conductive copper bar and the busbar shell during normal use of the terminal busbar. In order to meet the temperature rise standard, the usual way is to increase the cross-sectional area of ​​the copper bar or enhance the thermal conductivity of the copper bar to the shell. Increasing the copper bar gauge will increase the cost. Even so, when the busbar current continues to increase, the traditional response method can no longer meet the heat dissipation requirements.

[0005] During the use of the busbar, due to the large current, more heat will be generated. By using thin film insulation material to improve the thermal conductivity of the busbar to the casing, and then cooperating with the heat sink set on the outside of the busbar casing, it has a better heat dissipation effect. However, at a higher current level, there are still problems such as uneven heat dissipation and excessive temperature rise. In particular, the heat of the conductive busbar in the middle position is difficult to dissipate quickly. Long-term high temperature can easily cause the insulating material to age too quickly, and then it is easy to cause faults such as short circuits.

[0006] Chinese patent CN218633249U discloses a low-voltage, high-current terminal busbar, comprising a lower heat pipe type shell, an upper heat pipe type shell, a side plate one, a side plate two and a plurality of conductive busbars, wherein the side plate one and the side plate two are respectively fixedly connected to the two sides between the lower heat pipe type shell and the upper heat pipe type shell, the conductive busbar is connected between the lower heat pipe type shell, the upper heat pipe type shell, the side plate one and the side plate two, the lower heat pipe type shell is composed of a support body, a plurality of strip-shaped limiting heat conductive plates, a side baffle one, a side baffle two, a plurality of heat dissipation fins and a plurality of heat dissipation fans, the strip-shaped limiting heat conductive plates are fixedly connected to the top end of the support body, grooves matching the conductive busbars are formed between the strip-shaped limiting heat conductive plates, the side baffle one and the side baffle two are respectively fixedly connected to the two sides of the bottom end of the support body, the strip-shaped limiting heat conductive plates and the heat dissipation fan are fixedly connected to the bottom end of the support body, and a liquid cooling groove is opened inside the support body.

[0007] Although this solution uses a liquid cooling slot and a cooling fan, the part that contacts the conductive busbar in the middle and can conduct heat dissipation is only the slot part. The slot is an open slot structure surrounded by adjacent strip-shaped limiting heat-conducting plates and the top of the support body. Since the contact area between the slot and the conductive busbar, especially the conductive busbar in the middle, is small, it cannot meet the heat dissipation requirements of the large current conductive busbar. Summary of the invention

[0008] Purpose of the invention: The purpose of the utility model is to overcome the above-mentioned technical deficiencies and provide a heat pipe type terminal busbar that can meet the heat dissipation requirements during large current transmission.

[0009] Technical solution: A heat pipe type terminal busbar, comprising a copper busbar and a heat pipe type shell, an insulating film layer is provided between the copper busbar and the heat pipe type shell, the copper busbar is fixedly installed inside the heat pipe type shell, and the copper busbar and the heat pipe type shell are isolated by the insulating film layer; the heat pipe type shell between adjacent copper busbars is provided with a closed heat dissipation cavity extending along the length direction of the heat pipe type shell, the heat dissipation cavity is filled with coolant, the injection amount of the coolant is less than the volume of the heat dissipation cavity, and the cavity above the coolant liquid level in the heat dissipation cavity is in a vacuum state; the heat dissipation cavity comprises a horizontally distributed evaporation cavity and a vertically arranged condensation cavity, the evaporation cavity is connected to the condensation cavity to form an L-shaped cross-section structure, the bottom of the evaporation cavity is in contact with the upper surface of the copper busbar, and the outer side wall of the condensation cavity is in contact with the heat pipe type shell.

[0010] The utility model sets a heat dissipation cavity in the heat pipe shell between adjacent copper bars, injects part of the coolant into the heat dissipation cavity, and the cavity above the coolant liquid level in the heat dissipation cavity is in a vacuum state, which reduces the boiling point of the coolant, thereby forming a gravity heat pipe. During the operation of the busbar, the refrigerant evaporation phase change is used to absorb the heat generated from the middle copper bar. The evaporated refrigerant vapor rises to the upper heat dissipation fin part of the L-shaped cavity. The heat dissipation effect of the heat dissipation fin causes the vapor temperature to drop and condense into liquid again, and flows back to the bottom of the cavity under the action of gravity, thereby completing the cycle and efficient conduction of heat. During the phase change process, the coolant and the heat pipe shell perform sufficient heat exchange, which further improves the heat dissipation effect and the specific heat capacity of the coolant, and can absorb more heat.

[0011] In order to improve the heat dissipation effect of the high-current copper busbar located in the middle position, the bottom of the evaporation chamber and the upper surface of the copper busbar are insulated by an insulating film, which can achieve more uniform and efficient heat exchange; through the evaporation of the coolant, the high-temperature gaseous coolant fills the vertically arranged condensation chamber, and since the outer wall of the condensation chamber is provided with heat dissipation fins, the heat of the condenser can be quickly dissipated into the environment; the high-temperature steam is cooled and condensed into liquid again on the side of the condensation chamber close to the heat pipe shell, and due to the action of gravity, it flows back to the evaporation chamber along the vertical side wall of the condensation chamber, forming a disguised cycle heat dissipation; thereby efficiently dissipating the heat for the high-current copper busbar located in the middle position.

[0012] Preferably, in order to improve the phase change cooling effect, the injection amount of the coolant accounts for 20%-30% of the heat dissipation cavity volume. When the coolant injection amount exceeds 20%, it can ensure that the entire bottom of the heat dissipation cavity can be covered by the coolant, and the heat dissipation cavity can absorb heat more evenly, thereby achieving uniform heat dissipation of the copper bar; when the coolant injection amount does not exceed 30%, sufficient space can be reserved for the coolant phase change, which is more conducive to the phase change vapor-liquid circulation and improves the cooling effect. The coolant can be selected from water with a large specific heat capacity or an alcohol solution that is easily volatile.

[0013] Preferably, in order to improve the efficiency of phase change heat dissipation, the inner wall of the heat dissipation cavity is provided with a convex portion protruding inward. The convex portion can increase the contact area between the coolant and the inner wall of the heat dissipation cavity, thereby improving the efficiency of phase change cycle heat dissipation.

[0014] Preferably, in order to further improve the heat dissipation efficiency of the condensation chamber, a heat dissipation fin is provided on the outer side of the heat pipe type housing in contact with the outer side wall of the condensation chamber. The heat dissipation fin can further improve the heat dissipation effect of the heat pipe type housing on the side where the outer side wall of the condensation chamber is located.

[0015] Preferably, in order to facilitate the filling of coolant and the evacuation of the cavity above the coolant, closed end covers are respectively provided at both ends of the heat pipe type shell, and the closed end covers are fixedly welded at both ends of the heat pipe type shell to form a closed heat dissipation cavity; a closed joint is detachably sealed and connected on one side of the closed end cover, and the closed joint is located at the condensation cavity and passes through the closed end cover to communicate with the inside of the closed heat dissipation cavity.

[0016] A closed heat dissipation cavity is formed by the heat pipe shell and the closed end covers at both ends. During installation, the closed joint is first removed to inject the coolant, and then the closed joint is installed. The vacuum equipment is connected to evacuate the space above the coolant in the closed heat dissipation cavity. The closed joint adopts a one-way joint that conducts one-way from the inside to the outside. After the vacuum is evacuated, the closed heat dissipation cavity is kept in a vacuum state due to the action of the one-way joint.

[0017] Preferably, in order to further improve the heat dissipation effect of the entire terminal busbar, the outside of the contact portion between the heat pipe type shell and the copper bar is provided with external heat dissipation fins. The copper bar close to one side of the heat pipe type shell is mainly cooled by the external heat dissipation fins, which can further improve the heat dissipation effect of the entire terminal busbar.

[0018] Beneficial effects: The utility model can effectively improve the heat dissipation effect of the copper bar in the middle by setting a heat dissipation cavity in the heat pipe type shell on the two phase copper bars with poor heat dissipation conditions in the middle part of the busbar shell, injecting coolant and evacuating to form a gravity type heat pipe. Part of the coolant is injected into the heat dissipation cavity, and the cavity above the coolant liquid level in the heat dissipation cavity is in a vacuum state. The evaporative phase change can be used to absorb more heat generated by the middle copper bar. The evaporated refrigerant vapor rises to the upper heat dissipation fin part of the L-shaped cavity. The heat dissipation effect of the heat dissipation fin causes the vapor temperature to drop and condense into liquid again, and flows back to the bottom of the cavity under the action of gravity, thereby completing the circulation and efficient conduction of heat. During the phase change process, the coolant and the heat pipe type shell perform sufficient heat exchange, which further improves the heat dissipation effect and the specific heat capacity of the coolant, and can absorb more heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a partial enlarged view of the internal structure of the heat dissipation cavity of the utility model;

[0021] Figure 3 It is a three-dimensional stereogram of the utility model;

[0022] Figure 4 This is a view of one end of the utility model with a sealed joint;

[0023] Figure 5It is a partial cross-sectional view of the utility model in the exploded state of the sealed end cover and the heat pipe type shell;

[0024] Figure 6 It is a partial enlarged view of the connection state between the sealed end cover and the heat pipe type shell of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 and 2 As shown, a heat pipe type terminal busbar comprises a copper bar 1 and a heat pipe type shell 2, an insulating film layer is provided between the copper bar 1 and the heat pipe type shell 2, the copper bar 1 is fixedly installed inside the heat pipe type shell 2, and the copper bar 1 and the heat pipe type shell 2 are isolated by the insulating film layer; the heat pipe type shell 2 between the adjacent copper bars 1 is provided with a closed heat dissipation cavity 3 extending along the length direction of the heat pipe type shell 2, the heat dissipation cavity 3 is filled with a coolant 4, the injection amount of the coolant 4 is less than the volume of the heat dissipation cavity 3, and the cavity above the liquid level of the coolant 4 in the heat dissipation cavity 3 is in a vacuum state; the heat dissipation cavity 3 comprises a horizontally distributed evaporation cavity 31 and a vertically arranged condensation cavity 32, the evaporation cavity 31 is connected with the condensation cavity 32 to form an L-shaped cross-section structure, the bottom of the evaporation cavity 31 is in contact with the upper surface of the copper bar 1, and the outer wall of the condensation cavity 32 is in contact with the heat pipe type shell 2.

[0027] The utility model can effectively improve the heat dissipation effect of the copper bar 1 located in the middle by setting a heat dissipation cavity 3 in the heat pipe shell 2 between adjacent copper bars 1. A portion of the coolant 4 is injected into the heat dissipation cavity 3, and the cavity above the liquid level of the coolant 4 in the heat dissipation cavity 3 is in a vacuum state. The evaporative phase change can be used to absorb more heat generated by the middle copper bar. The evaporated refrigerant vapor rises to the upper heat dissipation fins of the L-shaped cavity. The heat dissipation effect of the heat dissipation fins causes the vapor temperature to drop and condense into liquid again, and flows back to the bottom of the cavity under the action of gravity, thereby completing the circulation and efficient conduction of heat. During the phase change process, the coolant and the heat pipe shell perform sufficient heat exchange, which further improves the heat dissipation effect and the specific heat capacity of the coolant, and can absorb more heat.

[0028] In order to improve the heat dissipation effect of the high-current copper busbar 1 located in the middle position, the bottom of the evaporation chamber 31 is in contact with the upper surface of the copper busbar 1, so that heat exchange can be carried out more evenly and effectively. Through the evaporation of the coolant 4, the high-temperature gaseous coolant fills the vertically arranged condensation chamber 32. Since the outer wall of the condensation chamber 32 is in contact with the heat pipe type shell 2, the heat exchange area can be increased and the heat dissipation efficiency can be improved. The inner wall of the condensation chamber 32 close to the side of the heat pipe type shell 2 will condense liquid coolant, and return to the evaporation chamber along the vertical side wall of the condensation chamber 32, forming a disguised cycle heat dissipation; it can effectively dissipate the heat of the high-current copper busbar 1 located in the middle position.

[0029] In order to improve the phase change cooling effect, the injection amount of the coolant 4 accounts for 20%-30% of the volume of the heat dissipation cavity 3. The injection amount of the coolant 4 exceeds 20% to ensure that the entire bottom of the heat dissipation cavity 3 can be covered by the coolant 4, and the heat dissipation cavity 3 can absorb heat more evenly, thereby achieving uniform heat dissipation of the copper bar 1; the injection amount of the coolant 4 does not exceed 30% to reserve enough space for the phase change of the coolant 4, which is more conducive to the phase change vapor-liquid circulation and improves the cooling effect. The coolant 4 can be selected from water with a large specific heat capacity or an alcohol solution that is easily volatile.

[0030] like Figure 2 As shown, in order to improve the efficiency of phase change heat dissipation, the inner wall of the heat dissipation cavity 3 is provided with a protrusion 341 protruding inward. The protrusion 341 can increase the contact area between the coolant and the inner wall of the heat dissipation cavity 3, thereby improving the efficiency of phase change cycle heat dissipation.

[0031] In order to further improve the heat dissipation efficiency of the condensation chamber 32, a heat dissipation fin 33 is provided on the outer side of the heat pipe housing 2 in contact with the outer side wall of the condensation chamber 32. The heat dissipation fin 33 can further improve the heat dissipation effect of the heat pipe housing on the side where the outer side wall of the condensation chamber 32 is located.

[0032] In order to further improve the heat dissipation effect of the entire terminal busbar, an external heat dissipation fin 5 is provided on the outside of the contact portion between the heat pipe type housing 2 and the copper busbar 1. The copper busbar 1 close to one side of the heat pipe type housing 2 is mainly radiated by the external heat dissipation fin 5, which may further improve the heat dissipation effect of the entire terminal busbar.

[0033] like Figure 4-6 As shown, in order to facilitate the filling of the coolant 4 and the evacuation of the cavity above the coolant 4, closed end covers 34 are respectively provided at both ends of the heat pipe shell 2, and the closed end covers 34 are fixedly welded at both ends of the heat pipe shell 2 to form a closed heat dissipation cavity 3; a closed end cover 34 on one side is detachably sealed and connected with a closed joint 35, and the closed joint 35 is located at the condensation cavity 32 and penetrates the closed end cover 34 to communicate with the inside of the closed heat dissipation cavity 3.

[0034] A closed heat dissipation cavity 3 is formed by the heat pipe shell 2 and the closed end covers 34 at both ends. During installation, the closed joint 35 is first removed to inject the coolant 4, and then the closed joint 35 is sealed and connected to the closed end cover 34 through the thread at the connecting end. The vacuum equipment is connected to evacuate the space above the coolant 4 in the closed heat dissipation cavity 3. The closed joint 35 adopts a one-way joint that conducts one way from the inside to the outside. After the vacuum is evacuated, the closed heat dissipation cavity 3 is kept in a vacuum state due to the action of the one-way joint.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat pipe type terminal busbar, comprising a copper bar (1) and a heat pipe type shell (2), wherein an insulating film layer is provided between the copper bar (1) and the heat pipe type shell (2), the copper bar (1) is fixedly mounted inside the heat pipe type shell (2), and the copper bar (1) and the heat pipe type shell (2) are isolated by the insulating film layer; characterized in that: The heat pipe type shell (2) between the adjacent copper bars (1) is provided with a closed heat dissipation cavity (3) extending along the length direction of the heat pipe type shell (2); the heat dissipation cavity (3) is filled with a coolant (4); the injection amount of the coolant (4) is less than the volume of the heat dissipation cavity (3); the cavity above the liquid level of the coolant (4) in the heat dissipation cavity (3) is in a vacuum state; the heat dissipation cavity (3) comprises a horizontally distributed evaporation cavity (31) and a vertically arranged condensation cavity (32); the evaporation cavity (31) and the condensation cavity (32) are connected to form an L-shaped structure in cross section; the bottom of the evaporation cavity (31) contacts the upper surface of the copper bar (1), and the outer wall of the condensation cavity (32) contacts the heat pipe type shell (2).

2. The heat pipe type terminal busbar according to claim 1, characterized in that: The injection amount of the coolant (4) accounts for 20%-30% of the volume of the heat dissipation cavity (3).

3. The heat pipe type terminal busbar according to claim 1, characterized in that: The inner wall of the heat dissipation cavity (3) is provided with a protruding portion (341) protruding inwards.

4. The heat pipe type terminal busbar according to claim 1, characterized in that: Heat dissipation fins (33) are provided on the outside of the heat pipe-type housing (2) in contact with the outer side wall of the condensation chamber (32).

5. The heat pipe type terminal busbar according to claim 1, characterized in that: The heat pipe shell (2) is provided with sealed end covers (34) at both ends, respectively; the sealed end covers (34) are fixedly welded to the two ends of the heat pipe shell (2) to form a sealed heat dissipation cavity (3); a sealed joint (35) is detachably sealed and connected to the sealed end cover (34) on one side; the sealed joint (35) is located at the condensation cavity (32), penetrates the sealed end cover (34), and is in communication with the inside of the sealed heat dissipation cavity (3).

6. The heat pipe terminal busbar according to any one of claims 1 to 5, characterized in that: External heat dissipation fins (5) are provided on the outside of the portion of the heat pipe-type housing (2) that contacts the copper busbar (1).

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