Liquid-cooled frequency converter

Abstract

This invention provides a liquid-cooled frequency converter, comprising: a housing, a liquid cooling box, IGBTs, and thyristors. The liquid cooling box is disposed inside the housing, and both the IGBTs and thyristors are disposed inside the housing and connected to the liquid cooling box. A cooling liquid can be introduced into the liquid cooling box. The IGBTs and thyristors exchange heat through contact with the liquid cooling box to be cooled by it. The liquid cooling box is located in the middle of the housing, while the IGBTs and thyristors are located on the outer periphery of the liquid cooling box, with the middle section situated within the space enclosed by the IGBTs and thyristors. This invention fully utilizes the surface space of the liquid cooling box, achieving global heat dissipation for the components inside the frequency converter, improving heat dissipation efficiency, and making the structure more compact. It also balances heat dissipation and ease of disassembly and installation. It effectively solves the problem of low heat dissipation efficiency in existing frequency converters due to their inability to effectively cool multiple components inside the frequency converter.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, specifically to a liquid-cooled frequency converter. Background Technology

[0002] With the rapid development of electronic technology and the widespread application of automated electrical equipment, the number of electronic components installed inside these devices has increased significantly to meet diverse functional requirements. This increased use of components inevitably leads to increased internal heat generation. Heat accumulation can cause equipment malfunctions and even burn out the equipment. Furthermore, existing frequency converters are inadequate for cooling the numerous components within the converter itself, resulting in low heat dissipation efficiency.

[0003] Because existing frequency converters have technical problems such as low heat dissipation efficiency due to their inability to cool multiple components inside the frequency converter, this utility model studies and designs a liquid-cooled frequency converter. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defect of existing frequency converters that cannot cool down multiple components inside the frequency converter, resulting in low heat dissipation efficiency, and thus provide a liquid-cooled frequency converter.

[0005] To address the aforementioned problems, this utility model provides a liquid-cooled frequency converter, comprising:

[0006] The enclosure comprises a housing, a liquid cooling box, an IGBT, and a thyristor. The liquid cooling box is disposed inside the housing. Both the IGBT and the thyristor are disposed inside the housing and connected to the liquid cooling box. A cooling liquid can be introduced into the liquid cooling box. The IGBT and the liquid cooling box exchange heat through contact to be cooled by the liquid cooling box. The thyristor and the liquid cooling box exchange heat through contact to be cooled by the liquid cooling box. The liquid cooling box is located in the middle of the housing, and the IGBT and the thyristor are located on the outer periphery of the liquid cooling box. The middle part is located in the space enclosed by the IGBT and the thyristor.

[0007] In some implementations...

[0008] It also includes relays and circuit breakers, both of which are located inside the housing and are connected to the outer periphery of the liquid cooling box. The relays exchange heat with the liquid cooling box in contact so that they can be cooled by the liquid cooling box, and the circuit breakers exchange heat with the liquid cooling box in contact so that they can be cooled by the liquid cooling box.

[0009] In some implementations...

[0010] It also includes a capacitor, which is disposed inside the liquid cooling tank to exchange heat with the liquid cooling liquid in the liquid cooling tank in direct contact, so as to be cooled by the liquid cooling liquid.

[0011] In some implementations...

[0012] It also includes a support pipe and a frequency converter bottom cover. The frequency converter bottom cover is located at the bottom end of the housing. The liquid cooling box is supported on the frequency converter bottom cover by the support pipe. An inlet hole is also provided on the support pipe at a position opposite to the height of the liquid cooling box. The inlet hole passes through the support pipe and communicates with the interior of the liquid cooling box so that liquid cooling liquid can be introduced through the interior of the support pipe and introduced into the liquid cooling box through the inlet hole.

[0013] In some implementations...

[0014] There are at least two support pipes, which are spaced apart to support different positions of the liquid cooling box;

[0015] The inverter bottom cover is provided with a bottom water inlet that extends through its upper and lower end faces. The bottom water inlet is vertically opposite to and connected to the support pipe, so that liquid cooling liquid is supplied into the support pipe through the bottom water inlet.

[0016] In some implementations...

[0017] The liquid cooling tank includes a bottom cover and a top cover. The support pipe extends from the bottom cover into the interior of the liquid cooling tank, with the upper end of the support pipe abutting against the top cover to support the liquid cooling tank. The inlet hole is opposite to and communicates with the interior space of the liquid cooling tank.

[0018] In some implementations...

[0019] The water tank top cover is provided with a water tank outlet pipe, and the liquid-cooled frequency converter also includes a frequency converter top cover with a frequency converter outlet. The lower end of the water tank outlet pipe is connected to the interior of the liquid-cooled tank, and the upper end of the water tank outlet pipe is opposite to and connected to the frequency converter outlet, so as to drain the water in the liquid-cooled tank.

[0020] In some implementations...

[0021] The inverter has a three-phase input port and a three-phase output port on its top cover. The three-phase input port is used to bring in wiring into the inverter, and the three-phase output port is used to bring out the wiring from the inverter to the outside of the inverter.

[0022] In some implementations...

[0023] The inverter top cover is a circular plate structure, the inverter bottom cover is also a circular plate structure, the outer shell is a cylindrical structure, the inverter top cover is located at the top of the outer shell, and the inverter bottom cover is located at the bottom of the outer shell; the liquid cooling box is a cylindrical structure.

[0024] In some implementations...

[0025] It also includes a capacitor clip bracket and a busbar. When the capacitor is also included, the busbar is located at the bottom of the capacitor, the capacitor clip bracket is fixed to the support pipe, and the capacitor is fixed to the capacitor clip bracket, so that the capacitor is fixed to the support pipe through the capacitor clip bracket. An isolation plate is also provided on the outer periphery of the capacitor, and the capacitor can exchange heat with the liquid cooling liquid in the liquid cooling tank through the isolation plate.

[0026] The liquid-cooled frequency converter provided by this utility model has the following beneficial effects:

[0027] 1. This utility model incorporates a liquid-cooled box inside the inverter's housing, with a cooling liquid flowing within it. IGBTs and thyristors are also housed inside the housing and connected to the outer periphery of the liquid-cooled box, surrounding the central part of the housing. This allows the liquid-cooled box to be centrally located, while the multiple components requiring cooling are positioned around it, achieving contact cooling. The central liquid-cooled box effectively cools multiple components within the inverter, fully utilizing its surface space for comprehensive heat dissipation, improving heat dissipation efficiency. Furthermore, it integrates the internal components into a single, compact heat dissipation structure, significantly reducing size. This design also facilitates heat dissipation and easy disassembly / reinstallation, eliminating the need for complex liquid cooling pipe designs and simplifying internal cleaning. This effectively solves the problem of low heat dissipation efficiency in existing inverters due to their inability to effectively cool multiple internal components.

[0028] 2. This utility model further improves the heat exchange efficiency of the liquid cooling box by setting the relays and circuit breakers to contact the outer periphery of the liquid cooling box, thereby increasing the heat exchange efficiency of the outer surface of the liquid cooling box and the internal heat exchange efficiency of the frequency converter. This utility model also further improves the heat exchange efficiency of the capacitor by setting it inside the liquid cooling box and contacting the liquid for heat exchange, thereby increasing the cooling efficiency of the capacitor. At the same time, it further utilizes the internal space of the liquid cooling box, making the structure more compact and reducing the overall size of the frequency converter.

[0029] 3. This utility model also features a support pipe that supports the liquid cooling box above the inverter's bottom cover while simultaneously allowing liquid cooling liquid to flow into the box. This reduces the number of pipes, resulting in a more compact structure and smaller size. Furthermore, by using a capacitor clip bracket to fix the capacitor to the support pipe, this utility model secures the capacitor, enabling effective contact cooling and heat dissipation of the capacitor within the liquid cooling box. This improves stability, enhances cooling performance at the bottom of the capacitor, and improves overall cooling and heat dissipation performance. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structure, top view, and bottom view of the liquid-cooled frequency converter of this utility model;

[0031] Figure 2 This is an internal structural diagram of the liquid-cooled frequency converter of this utility model;

[0032] Figure 3 This is a bottom view of the liquid cooling box of the frequency converter of this utility model.

[0033] Figure 4 This is a partial cross-sectional view of the liquid cooling box part of the frequency converter of this utility model.

[0034] The reference numerals in the attached figures are as follows:

[0035] 1. Inverter top cover; 2. Inverter bottom cover; 3. Housing; 4. IGBT; 5. Thyristor; 6. Temperature controller; 7. Relay; 8. Circuit breaker; 9. Water tank top cover; 10. Busbar; 11. Capacitor; 12. Support pipe; 13. Isolation plate; 14. Inlet hole; 15. Water tank bottom cover; 16. Inverter outlet; 17. Capacitor clip bracket; 18. Water tank outlet pipe; 19. Bottom inlet; 20. Three-phase input port; 21. Three-phase output port; 22. Busbar mounting hole; 100. Liquid cooling box. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0039] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0042] like Figure 1-4 As shown, this utility model provides a liquid-cooled frequency converter, which includes:

[0043] The enclosure consists of a housing 3, a liquid cooling box 100, an IGBT 4, and a thyristor 5. The liquid cooling box 100 is disposed inside the housing 3. The IGBT 4 and the thyristor 5 are both disposed inside the housing 3 and are connected to the liquid cooling box 100. A cooling liquid can be introduced into the liquid cooling box 100. The IGBT 4 and the liquid cooling box 100 exchange heat through contact so that the IGBT 4 can be cooled by the liquid cooling box 100. The thyristor 5 and the liquid cooling box 100 exchange heat through contact so that the thyristor 5 can be cooled by the liquid cooling box 100. The liquid cooling box 100 is located in the middle of the housing 3, and the IGBT 4 and the thyristor 5 are located on the outer periphery of the liquid cooling box 100. The middle part is located in the space enclosed by the IGBT 4 and the thyristor 5.

[0044] This invention, through the aforementioned method of setting a liquid cooling box inside the inverter's housing, with a liquid flowing inside for cooling and heat dissipation, also houses the IGBTs and thyristors within the housing and connects to the outer periphery of the liquid cooling box, surrounding the central part of the housing. This allows the liquid cooling box to be located in the center, while the multiple components requiring heat dissipation are located around it, achieving contact cooling. The central liquid cooling box effectively cools multiple components within the inverter, fully utilizing its surface space for global heat dissipation of the inverter's components, improving heat dissipation efficiency. Furthermore, it integrates the internal components into a single, compact heat dissipation structure, significantly reducing size. It also facilitates heat dissipation and easy disassembly / reinstallation, eliminating the need for complex liquid cooling pipe designs and simplifying internal cleaning. This effectively solves the problem of low heat dissipation efficiency in existing inverter technologies due to their inability to effectively cool multiple internal components.

[0045] See Figure 2 In this invention, the IGBT4 and thyristor 5 are the main heat-generating components of the frequency converter. By tightly attaching their backs to the surface of the column-type liquid cooling box 100, rapid heat dissipation can be achieved. Furthermore, the IGBT and the three thyristors can fill all four sides of the column-type liquid cooling box 100, maximizing utilization. Other low-voltage components are preferably installed on the surface of the bottom cover 2 of the frequency converter to separate high and low voltage circuits and ensure electrical safety.

[0046] In some implementations...

[0047] It also includes a relay 7 and a circuit breaker 8. The relay 7 and the circuit breaker 8 are both disposed inside the housing 3 and are both connected to the outer periphery of the liquid cooling box 100. The relay 7 exchanges heat with the liquid cooling box 100 in contact so that it can be cooled by the liquid cooling box 100. The circuit breaker 8 exchanges heat with the liquid cooling box 100 in contact so that it can be cooled by the liquid cooling box 100.

[0048] This invention also improves the heat exchange efficiency of the liquid cooling box by setting the relay and circuit breaker to contact the outer periphery of the liquid cooling box, thereby further improving the heat exchange efficiency of the outer surface of the liquid cooling box and the heat exchange efficiency of the inverter.

[0049] In some implementations...

[0050] It also includes a capacitor 11, which is disposed inside the liquid cooling box 100 to exchange heat with the liquid cooling liquid in the liquid cooling box 100 in direct contact, so as to be cooled by the liquid cooling liquid.

[0051] This invention further enhances the cooling efficiency of the capacitor by placing it inside the liquid cooling box and exchanging heat with the liquid through contact. At the same time, it makes better use of the internal space of the liquid cooling box, making the structure more compact and reducing the overall size of the frequency converter.

[0052] In some implementations...

[0053] It also includes a support pipe 12 and a frequency converter bottom cover 2. The frequency converter bottom cover 2 is disposed at the bottom end of the outer shell 3. The liquid cooling box 100 is supported on the frequency converter bottom cover 2 by the support pipe 12. An inlet hole 14 is also provided on the support pipe 12 at a position opposite to the height of the liquid cooling box 100. The inlet hole 14 penetrates the support pipe 12 and communicates with the interior of the liquid cooling box 100 so that liquid cooling liquid can be introduced through the interior of the support pipe 12 and introduced into the liquid cooling box 100 through the inlet hole 14.

[0054] This invention also provides a support pipe inside the frequency converter, which supports the liquid cooling box above the bottom cover of the frequency converter and allows liquid cooling liquid to be introduced into the liquid cooling box through the support pipe. This reduces the number of pipes, making the structure more compact and the size smaller.

[0055] This utility model improves a column-type integrated liquid-cooled frequency converter, comprising a top cover 1, a bottom cover 2, a shell 3 with an arc-shaped outer circumference, a column-type liquid-cooling box 100, and necessary electronic components. The liquid-cooling box 100 is welded to the bottom cover 2 by means of supporting pipes 12, so that the entire liquid-cooling box is away from the bottom cover 2, facilitating the installation of components. Other electronic components are mounted on the surface of the bottom cover 2 and the surface of the liquid-cooling box 100.

[0056] In some implementations...

[0057] There are at least two support pipes 12, and the at least two support pipes 12 are arranged at intervals to support different positions of the liquid cooling box 100;

[0058] The inverter bottom cover 2 is provided with a bottom water inlet 19 that extends through its upper and lower end faces. The bottom water inlet 19 is vertically opposite to and connected to the support pipe 12, so that the liquid cooling liquid is supplied into the support pipe 12 through the bottom water inlet 19.

[0059] This invention enhances the stability of the liquid cooling tank through at least two supporting pipes and increases the flow rate of the liquid supplied to the liquid cooling tank. The bottom inlet on the bottom cover of the frequency converter is vertically aligned with and connected to the supporting pipes, allowing the liquid cooling fluid to be supplied to the supporting pipes and further into the liquid cooling tank.

[0060] In some implementations...

[0061] The liquid cooling tank 100 includes a bottom cover 15 and a top cover 9. The support pipe 12 extends from the bottom cover 15 into the interior of the liquid cooling tank 100, and the upper end of the support pipe 12 abuts against the top cover 9 to support the liquid cooling tank 100. The inlet hole 14 is opposite to and communicates with the interior space of the liquid cooling tank 100.

[0062] This utility model utilizes the preferred structural form of the water tank bottom cover and supporting pipe described above. The supporting pipe passes through the water tank bottom cover and extends into the liquid cooling tank until it abuts against the water tank top cover. This allows the supporting water tank top cover to provide support for the liquid cooling tank. In this way, the inlet holes penetrating the inner and outer walls of the supporting pipe can effectively guide the liquid into the liquid cooling tank, thus achieving the liquid cooling liquid transfer effect.

[0063] In some implementations...

[0064] The water tank top cover 9 is provided with a water tank outlet pipe 18. The liquid-cooled frequency converter also includes a frequency converter top cover 1. The frequency converter top cover 1 is provided with a frequency converter outlet 16. The lower end of the water tank outlet pipe 18 is connected to the interior of the liquid-cooled tank 100, and the upper end of the water tank outlet pipe 18 is opposite to and connected to the frequency converter outlet 16, so as to drain the water in the liquid-cooled tank 100.

[0065] The present invention also preferably connects the water tank outlet pipe provided on the top cover of the water tank and the inverter outlet provided on the top cover of the inverter, so that the liquid in the liquid cooling tank can be discharged upward to the outside of the inverter through the water tank outlet pipe and the inverter outlet, so as to realize the continuous flow of liquid cooling liquid and further improve the heat exchange performance of the internal components of the inverter.

[0066] In some implementations...

[0067] The inverter top cover 1 is provided with a three-phase input port 20 and a three-phase output port 21. The three-phase input port 20 is used to bring in wiring into the inverter, and the three-phase output port 21 is used to bring out the wiring in the inverter to the outside of the inverter.

[0068] This utility model, through the three-phase input port and three-phase output port opened on the top cover of the frequency converter, can introduce three wires into the inside of the frequency converter through the three-phase input port and out through the three-phase output port, realizing the power connection function of the internal components of the frequency converter, further realizing the integration of power supply and cooling, making the structure more compact and the overall frequency converter more miniaturized.

[0069] See Figure 1 The inverter of this invention is also designed with a cylindrical shape. When disassembling and assembling the inverter, simply removing the top cover 1 and the outer casing 3 on the arc-shaped outer circumference allows for easy installation of components. Furthermore, the top cover 1 of the inverter has a three-phase input port 20 and a three-phase output port 21. A certain electrical safety distance is maintained between each port. Because the inverter is cylindrical, the orientation of the inlet and outlet ports can be changed by rotating the inverter, making wiring easier.

[0070] In some implementations...

[0071] The inverter top cover 1 is a circular plate structure, the inverter bottom cover 2 is also a circular plate structure, the outer shell 3 is a cylindrical structure, the inverter top cover 1 is located at the top of the outer shell 3, and the inverter bottom cover 2 is located at the bottom of the outer shell 3; the liquid cooling box 100 is a cylindrical structure.

[0072] This is a preferred structural form of the inverter top cover, bottom cover and outer shell of this utility model, forming a cylindrical inverter structure. The liquid cooling box is also preferably a cylindrical structure and is set inside the inverter, which further improves the compactness of the overall inverter structure and further realizes miniaturization.

[0073] This utility model preferably adopts a column-type sheet metal structure liquid-cooled box, making full use of surface space. Modules and electronic components are mounted on the surface of the central column, and coolant can be injected into the inside of the column for overall heat dissipation circulation. This integrates the installation of all inverter components with the cooling system, achieving efficient heat dissipation. By integrating the inverter into a single structure, the size is greatly reduced, and 360-degree seamless disassembly and installation are possible, reducing manufacturing difficulty and improving installation efficiency, thus balancing heat dissipation and disassembly. Furthermore, the column-type heat dissipation eliminates the need for complex liquid cooling pipe designs, making internal cleaning easier.

[0074] The beneficial effects of this utility model are:

[0075] 1. Integrated cooling system with high integration.

[0076] 2. Significantly reduces the size of the frequency converter and improves space utilization.

[0077] 3. The column-type structure allows for all-around component assembly and disassembly.

[0078] 4. Eliminate complex cooling pipes to improve installation convenience.

[0079] In some implementations...

[0080] It also includes a capacitor clip bracket 17 and a busbar 10. When it also includes a capacitor 11, the busbar 10 is disposed at the bottom of the capacitor 11, the capacitor clip bracket 17 is fixed to the support pipe 12, and the capacitor 11 is fixed to the capacitor clip bracket 17, so that the capacitor 11 is fixed to the support pipe 12 through the capacitor clip bracket 17; an isolation plate 13 is also provided on the outer periphery of the capacitor 11, and the capacitor 11 can exchange heat with the liquid cooling liquid in the liquid cooling box 100 through the isolation plate 13.

[0081] This invention, by setting a capacitor clip bracket to fix it to the support pipe, can achieve the fixation of the capacitor, enabling effective contact cooling and heat dissipation of the capacitor by the liquid inside the liquid cooling box, improving stability, increasing the cooling performance of the bottom of the capacitor, and improving the cooling and heat dissipation performance of the capacitor.

[0082] See Figure 3 and Figure 4 The capacitor 11 is installed at the bottom of the column-type liquid cooling box 100 and fixed by the capacitor clip bracket 17. The liquid is separated by the isolation plate 13, while ensuring that the heat generated by the capacitor 11 can be transferred to the liquid. The support pipe 12 serves as both a support component for the entire inverter and an important cooling pipe for the entire inverter. The support pipe 12 is welded to the column-type liquid cooling box 100. A portion of the support pipe 12 inside the column-type liquid cooling box 100 has an inlet hole 14 for delivering coolant into the liquid cooling box. The section of the support pipe 12 that contacts the inverter bottom cover 2 has an opening with four corresponding bottom water inlets 19. The coolant enters from the lower layer, and after cooling is completed, it flows out from the upper water tank outlet pipe 18. Thus, the column-type liquid cooling box 100 completes the cooling of the heat-generating components of the inverter, achieving integrated cooling with multiple functions in one box.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A liquid-cooled frequency converter, characterized by: include: The enclosure (3), liquid cooling box (100), IGBT (4), and thyristor (5) are arranged inside the enclosure (3). The liquid cooling box (100) is located inside the enclosure (3). The IGBT (4) and the thyristor (5) are both located inside the enclosure (3) and are connected to the liquid cooling box (100). Liquid for cooling and heat dissipation can be introduced into the liquid cooling box (100). The IGBT (4) exchanges heat with the liquid cooling box (100) in contact so that it can be cooled by the liquid cooling box (100). The thyristor (5) exchanges heat with the liquid cooling box (100) in contact so that it can be cooled by the liquid cooling box (100). The liquid cooling box (100) is located in the middle of the enclosure (3). The IGBT (4) and the thyristor (5) are both located on the outer periphery of the liquid cooling box (100). The middle part is located in the space enclosed by the IGBT (4) and the thyristor (5).

2. The liquid-cooled frequency converter according to claim 1, characterized in that: It also includes a relay (7) and a circuit breaker (8), both of which are located inside the housing (3) and are connected to the outer periphery of the liquid cooling box (100). The relay (7) exchanges heat with the liquid cooling box (100) in contact so that it can be cooled by the liquid cooling box (100), and the circuit breaker (8) exchanges heat with the liquid cooling box (100) in contact so that it can be cooled by the liquid cooling box (100).

3. The liquid-cooled frequency converter according to claim 1, characterized in that: It also includes a capacitor (11), which is disposed inside the liquid cooling box (100) to exchange heat with the liquid cooling liquid in the liquid cooling box (100) in direct contact, so as to be cooled by the liquid cooling liquid.

4. The liquid-cooled frequency converter according to claim 1, characterized in that: It also includes a support pipe (12) and a frequency converter bottom cover (2). The frequency converter bottom cover (2) is located at the bottom end of the outer shell (3). The liquid cooling box (100) is supported on the frequency converter bottom cover (2) through the support pipe (12). An inlet hole (14) is also provided on the support pipe (12) at a position opposite to the height of the liquid cooling box (100). The inlet hole (14) penetrates the support pipe (12) and communicates with the interior of the liquid cooling box (100) so that liquid cooling liquid can be introduced through the interior of the support pipe (12) and introduced into the liquid cooling box (100) through the inlet hole (14).

5. The liquid-cooled frequency converter according to claim 4, characterized in that: There are at least two support pipes (12), and the at least two support pipes (12) are arranged at intervals to support different positions of the liquid cooling box (100); The inverter bottom cover (2) is provided with a bottom water inlet (19) that extends through its upper and lower end faces. The bottom water inlet (19) is vertically opposite to and connected to the support pipe (12), so that the liquid cooling liquid is supplied into the support pipe (12) through the bottom water inlet (19).

6. The liquid-cooled frequency converter according to claim 4, characterized in that: The liquid cooling box (100) includes a bottom cover (15) and a top cover (9). The support pipe (12) extends from the bottom cover (15) into the interior of the liquid cooling box (100), and the upper end of the support pipe (12) abuts against the top cover (9) to support the liquid cooling box (100). The inlet hole (14) is opposite to and communicates with the interior space of the liquid cooling box (100).

7. The liquid-cooled frequency converter according to claim 6, characterized in that: The water tank top cover (9) is provided with a water tank outlet pipe (18), and the liquid-cooled frequency converter also includes a frequency converter top cover (1). The frequency converter top cover (1) is provided with a frequency converter outlet (16). The lower end of the water tank outlet pipe (18) is connected to the inside of the liquid-cooled box (100), and the upper end of the water tank outlet pipe (18) is opposite to and connected to the frequency converter outlet (16) so as to drain the water in the liquid-cooled box (100).

8. The liquid-cooled frequency converter according to claim 7, characterized in that: The inverter top cover (1) is provided with a three-phase input port (20) and a three-phase output port (21). The three-phase input port (20) is used to bring in wiring into the inverter, and the three-phase output port (21) is used to bring out the wiring in the inverter to the outside of the inverter.

9. The liquid-cooled frequency converter according to claim 7, characterized in that: The inverter top cover (1) is a circular plate structure, the inverter bottom cover (2) is also a circular plate structure, the outer shell (3) is a cylindrical structure, the inverter top cover (1) is located at the top of the outer shell (3), and the inverter bottom cover (2) is located at the bottom of the outer shell (3); the liquid cooling box (100) is a cylindrical structure.

10. The liquid-cooled frequency converter according to claim 4, characterized in that: It also includes a capacitor clip bracket (17) and a busbar (10). When it also includes a capacitor (11), the busbar (10) is located at the bottom of the capacitor (11). The capacitor clip bracket (17) is fixed to the support pipe (12). The capacitor (11) is fixed to the capacitor clip bracket (17), so that the capacitor (11) is fixed to the support pipe (12) through the capacitor clip bracket (17). An isolation plate (13) is also provided on the outer periphery of the capacitor (11). The capacitor (11) can exchange heat with the liquid cooling liquid in the liquid cooling box (100) through the isolation plate (13).

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