Frequency converter and electrical equipment

Abstract

The utility model discloses a frequency converter and electrical equipment. The frequency converter comprises a cabinet body, an electric reactor and an electric reactor mounting metal plate, the electric reactor mounting metal plate is fixed on the back plate of the cabinet body, an electric reactor mounting cavity is formed between the electric reactor mounting metal plate and the back plate of the cabinet body, and the electric reactor is arranged in the electric reactor mounting cavity; the backboard of the cabinet body is provided with an electric reactor installation cavity air outlet communicated with the electric reactor installation cavity, and the electric reactor installation cavity air outlet is provided with an electric reactor installation cavity heat dissipation fan. According to the utility model, the electric reactor is arranged in the electric reactor mounting cavity, the electric reactor mounting cavity air outlet is arranged on the back plate of the cabinet body, and the electric reactor mounting cavity heat dissipation fan is arranged at the electric reactor mounting cavity air outlet, so that the electric reactor mounting cavity can form an independent air channel under the action of the electric reactor mounting cavity heat dissipation fan; heat generated by the electric reactor is discharged through the air outlet of the electric reactor mounting cavity, and heat dissipation of other components is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a frequency converter and electrical equipment. Background Art

[0002] With higher requirements for central air-conditioning in terms of green environmental protection, traditional high-power water-cooled central air-conditioning such as fixed-frequency screw air-conditioning is gradually being replaced by oil-free and friction-free magnetic and air-suspended centrifugal large-scale water-cooled central air-conditioning, among which high-power frequency conversion cabinets play a particularly critical role.

[0003] One of the development directions of high-power frequency converter cabinets is miniaturization and integrated design, which can not only improve the power density of the frequency converter cabinet, but also reduce the cost due to its smaller size. However, the important problem faced by the miniaturization and integration of the frequency converter cabinet is that the internal space of the frequency converter is small, which increases the difficulty of assembly and maintenance.

[0004] Usually, the reactor and other components of the frequency converter cabinet are laid flat in the cabinet of the frequency converter cabinet. The reactor is large in size and generates a lot of heat. On the one hand, the heat of the reactor will flow throughout the cabinet of the frequency converter cabinet, affecting the overall heat dissipation. On the other hand, the space utilization rate is not high, which does not conform to the development trend of miniaturization and integration of the frequency converter cabinet.

[0005] Therefore, how to ensure that the heat of the reactor does not affect the heat dissipation of other components through spatial layout is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a frequency converter, so that the heat of the reactor will not affect the heat dissipation of other components through spatial layout;

[0007] Another object of the utility model is to provide an electrical device having the above-mentioned frequency converter.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A frequency converter, comprising a cabinet, a reactor and a reactor mounting sheet metal;

[0010] The reactor installation sheet metal is fixed on the back plate of the cabinet, and a reactor installation cavity is formed between the reactor installation sheet metal and the back plate of the cabinet, and the reactor is arranged in the reactor installation cavity;

[0011] The back plate of the cabinet is provided with a reactor installation cavity air outlet which is in communication with the reactor installation cavity, and a reactor installation cavity heat dissipation fan is provided at the reactor installation cavity air outlet;

[0012] The cabinet is provided with an air inlet which is communicated with the cavity of the cabinet.

[0013] Optionally, in the above-mentioned inverter, the reactor mounting sheet metal is in a box structure with an opening, and the open side of the reactor mounting sheet metal is provided with a fixed folded edge bent outward, and the fixed folded edge is attached to the back plate of the cabinet and fixed by fasteners.

[0014] Optionally, in the above-mentioned inverter, the reactor mounting sheet metal is provided with at least one reactor mounting cavity air inlet connected to the reactor mounting cavity, and the reactor is arranged on the heat dissipation path between the reactor mounting cavity air inlet and the reactor mounting cavity air outlet.

[0015] Optionally, in the above-mentioned inverter, at least one air inlet of the reactor installation cavity is located at the lower side of the reactor installation sheet metal.

[0016] Optionally, in the above-mentioned inverter, the wall panel of the reactor mounting sheet metal opposite to its open side is the reactor mounting back plate, and a first electronic component is installed on the side of the reactor mounting back plate facing away from the reactor mounting cavity, and the heat generated by the first electronic component is less than the heat generated by the reactor.

[0017] Optionally, in the above frequency converter, the first electronic component includes at least one of a circuit breaker, an input copper busbar and an incoming line grounding copper busbar.

[0018] Optionally, in the above-mentioned inverter, a second electronic component is arranged in the reactor installation cavity, the heat generated by the second electronic component is less than the heat generated by the reactor, and along the heat dissipation path of the reactor installation cavity, the reactor and the second electronic component are arranged from low to high according to the heat generated.

[0019] Optionally, in the above-mentioned inverter, the second electronic component includes at least one of a contactor and a charging resistor.

[0020] Optionally, in the above frequency converter, the air inlet comprises at least a first air inlet and a second air inlet respectively arranged on both sides of the bottom of the cabinet; and / or,

[0021] A third electronic component is disposed in the cabinet, and the reactor mounting sheet metal and the third electronic component are arranged sequentially in the width direction.

[0022] Optionally, in the above-mentioned inverter, an air outlet heat dissipation device and a third air inlet are provided on the side wall of the cabinet close to the third electronic component to dissipate heat for the DC bus capacitor module, so as to form a heat dissipation path for the side wall close to the third electronic component.

[0023] The frequency converter provided by the utility model forms a reactor installation cavity by fixing the reactor installation sheet metal on the back plate of the cabinet, and the reactor is arranged in the reactor installation cavity. An air outlet of the reactor installation cavity is provided on the back plate of the cabinet, and a reactor installation cavity heat dissipation fan is provided at the reactor installation cavity air outlet. Under the action of the reactor installation cavity heat dissipation fan, the reactor installation cavity can form an independent air duct, and the heat generated by the reactor is discharged through the reactor installation cavity air outlet without affecting the heat dissipation of other components.

[0024] An electrical device comprises the frequency converter as described in any one of the above items.

[0025] The electrical equipment provided by the utility model has the above-mentioned frequency converter, and therefore has all the technical effects of the above-mentioned frequency converter, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the internal structure of an electrical device from a main viewing angle provided by an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the internal structure of an electrical device from a side view provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the external structure of an electrical device provided in an embodiment of the utility model;

[0030] Figure 4 A schematic diagram of the structure of a reactor mounting sheet metal provided in an embodiment of the utility model.

[0031] The meanings of the reference numerals in the figures are as follows:

[0032] 100-DC bus capacitor module;

[0033] 200-power module;

[0034] 300-cabinet; 301-first air inlet; 302-second air inlet; 303-third air inlet; 304-first air outlet heat dissipation device; 305-second air outlet heat dissipation device; 306-reactor installation cavity air outlet; 307-back plate;

[0035] 500-incoming grounding copper bar;

[0036] 600-circuit breaker;

[0037] 700-reactor installation sheet metal; 701-reactor installation cavity; 702-fixed folding edge; 703-reactor installation back plate; 704-notch; 705-reactor installation side plate; 706-reactor installation top plate;

[0038] 800- Reactor;

[0039] 900-contactor;

[0040] 1000-Charging resistor. DETAILED DESCRIPTION

[0041] The core of the utility model is to provide a frequency converter, so that the heat of the reactor will not affect the heat dissipation of other components through spatial layout;

[0042] Another core of the utility model is to provide an electrical device having the above-mentioned frequency converter.

[0043] 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 in 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.

[0044] It should be noted that the embodiments of the present invention provide Figure 1-Figure 4 In the display, there are direction indications, such as up and down, front and back, left and right; the direction indication means that the door side of the cabinet is the front, the side opposite to the door side is the back, facing the door side, the left side is the left, the right side is the right, the upper side of the cabinet is the top, and the lower side is the bottom.

[0045] like Figure 1 and Figure 2 As shown, the embodiment of the utility model discloses a frequency converter, which includes a cabinet 300, a reactor 800 and a reactor mounting sheet metal 700. The reactor mounting sheet metal 700 is fixed on the back plate 307 of the cabinet 300, and a reactor mounting cavity 701 is formed between the reactor mounting sheet metal 700 and the back plate 307 of the cabinet 300. It should be noted that the reactor mounting cavity 701 needs to be connected to the cavity of the cabinet 300 to ensure that air can flow freely to take away the heat in the reactor mounting cavity 701. The reactor mounting cavity 701 may not be connected to the cavity of the cabinet 300, and an air inlet connected to the outside of the cabinet 300 is opened on the back plate 307 to form an effective heat dissipation duct.

[0046] The reactor 800 is disposed in the reactor installation cavity 701. Specifically, the reactor 800 can be fixed on the reactor installation sheet metal 700 or on the back plate 307 of the cabinet 300. This embodiment does not limit the fixing position of the reactor 800, as long as it is disposed in the reactor installation cavity 701.

[0047] As shown in the figure and Figure 3 As shown, the back plate 307 of the cabinet 300 is provided with a reactor installation cavity air outlet 306 connected to the reactor installation cavity 701, and a reactor installation cavity heat dissipation fan is provided at the reactor installation cavity air outlet 306. It should be noted that the position of the reactor installation cavity air outlet 306 can be at a position equal to the height of the reactor 800, or higher than the reactor 800. It can be understood by those skilled in the art that, in order to achieve heat dissipation, the reactor installation cavity 701 is not a closed cavity. With the arrangement of the reactor installation cavity air outlet 306, the reactor installation cavity 701 needs to have a corresponding installation cavity air inlet, and at least one installation cavity air inlet should be arranged on the lower side of the reactor 800, so that the heat dissipation airflow enters the reactor installation cavity 701 from the installation cavity air inlet, flows through the reactor 800, and is discharged from the reactor installation cavity 701 through the reactor installation cavity air outlet 306.

[0048] The cabinet 300 is provided with an air inlet connected to the cavity of the cabinet 300. The airflow entering the reactor installation cavity 701 from the installation cavity air inlet comes from the cavity of the cabinet. Therefore, a corresponding air inlet needs to be arranged on the cabinet 300 so that external air can enter the cabinet 300. Specifically, the air inlet includes at least a first air inlet 301 and a second air inlet 302 respectively arranged on both sides of the bottom of the cabinet 300.

[0049] The frequency converter provided by the utility model forms a reactor installation cavity 701 by fixing the reactor installation sheet metal 700 on the back plate 307 of the cabinet 300, and the reactor 800 is arranged in the reactor installation cavity 701. The reactor installation cavity air outlet 306 is provided on the back plate 307 of the cabinet 300, and a reactor installation cavity heat dissipation fan is arranged at the reactor installation cavity air outlet 306. Under the action of the reactor installation cavity heat dissipation fan, the reactor installation cavity 701 can form an independent air duct, and the heat generated by the reactor is discharged through the reactor installation cavity air outlet 306, so that the heat generated by the reactor 800 will not spread to other components in the cabinet 300, and the heat dissipation of other components will not be affected.

[0050] like Figure 4As shown, in this embodiment, the reactor installation sheet metal 700 is a box structure with an opening, and the open side of the reactor installation sheet metal 700 is provided with a fixed folding edge 702 bent outward, that is, the fixed folding edge 702 is bent toward the outside of the cavity of the box body, and the fixed folding edge 702 is attached to the back plate 307 of the cabinet 300 and fixed by a fastener. A fastening hole for the fastener to pass through can be provided on the fixed folding edge 702 to facilitate the fixation with the back plate 307 of the cabinet 300. It should be noted that there is a need for some structures in the reactor installation cavity 701 to extend to the outside of the reactor installation cavity 701, and a notch 704 can be provided at the corresponding position of the reactor installation sheet metal 700, so that the structure with the need to extend outward can extend out of the reactor installation cavity 701.

[0051] The reactor installation sheet metal 700 is provided with at least one reactor installation cavity air inlet connected to the reactor installation cavity 701, and the reactor 800 is arranged on the heat dissipation path between the reactor installation cavity air inlet and the reactor installation cavity air outlet 306. In order to provide a larger installation space for the reactor 800 and facilitate the arrangement of the reactor 800, at least one reactor installation cavity air inlet can be arranged on the lower side of the reactor installation sheet metal 700 in the height direction, and the reactor installation cavity air outlet 306 can be arranged at a slightly higher position than the reactor installation cavity 701.

[0052] It should be noted that the reactor installation cavity air inlet can be formed by not providing the lower side wall plate of the box structure, or by opening a hole in the lower side wall plate of the box structure, as long as the effective flow of air can be achieved. In addition, the notch 704 can also achieve effective air intake to improve heat exchange efficiency.

[0053] The wall plate of the reactor installation sheet metal 700 opposite to its open side is the reactor installation back plate 703, which is a rectangular structure, and its two sides extending in the height direction are connected to the reactor installation side plates 705, and its side located at the top is connected to the reactor installation top plate 706, and the reactor installation side plates 705 and the reactor installation top plate 706 are bent with fixed folded edges 702 on the side away from the reactor installation back plate 703. The reactor installation sheet metal 700 can be an integrated bending structure, or it can be formed by connecting and assembling multiple plates.

[0054] The size of the reactor 800 is not large, and it does not occupy the entire size of the cabinet 300 in the front-to-back direction. In this embodiment, in order to improve space utilization, a first electronic component with less influence on heat generation can be installed on the side of the reactor installation back plate 703 facing away from the reactor installation cavity 701, and the heat generation of the first electronic component is less than the heat generation of the reactor 800. The heat generation of the first electronic component itself is less than the heat generation of the reactor 800, so installing the first electronic component on the reactor installation back plate 703 does not affect the heat dissipation of the reactor 800. In addition, the first electronic component has little influence on heat generation, and the reactor 800 with a large heat generation does not affect the effectiveness and safety of the first electronic component.

[0055] In this embodiment, the first electronic component may include at least one of the circuit breaker 600, the input copper bar 400 and the incoming line grounding copper bar 500. The heat generated by the circuit breaker 600, the input copper bar 400 and the incoming line grounding copper bar 500 is less than the heat generated by the reactor 800. Fixing all three on the reactor mounting back plate 703 will not affect the effective heat dissipation of the reactor 800. The reactor 800 has little effect on the circuit breaker 600, the input copper bar 400 and the incoming line grounding copper bar 500, and the circuit breaker 600 itself also needs to be fixed. Therefore, at least one of the circuit breaker 600, the input copper bar 400 and the incoming line grounding copper bar 500 is installed on the reactor mounting back plate 703, which improves the space utilization of the cabinet 300 without affecting the normal use of each component.

[0056] In addition, a second electronic component having a greater heat generation than the first electronic component may be arranged in the reactor installation cavity 701, and the heat generation of the second electronic component is less than the heat generation of the reactor 800. Along the heat dissipation path of the reactor installation cavity 701, the reactor 800 and the second electronic component are arranged from low to high according to the heat generation. Since the reactor installation cavity 701 has a reliable and independent heat dissipation duct, and the reactor installation cavity 701 is not completely occupied by the reactor 800, in this embodiment, in order to effectively utilize the reactor installation cavity 701, in addition to the reactor 800, the second electronic component is also arranged in the reactor installation cavity 701.

[0057] The heat generated by the second electronic component is less than that of the reactor 800. Along the heat dissipation path, the reactor 800 can be arranged downstream of the second electronic component to prevent the reactor 800 with a larger heat generation from affecting the effective heat dissipation of the second electronic component. The second electronic component is arranged upstream of the reactor 800 so that the heat generated by the reactor 800 does not flow through the second electronic component.

[0058] In this embodiment, the second electronic component may include at least one of the contactor 900 and the charging resistor 1000 to further improve the space utilization. It should be noted that the contactor 900 and the charging resistor 1000 can be arranged below the reactor 800, and the reactor installation cavity air outlet 306 is located above the reactor 800. The heat generated by the contactor 900 and the charging resistor 1000 is smaller than that of the reactor 800. Therefore, the contactor 900 and the charging resistor 1000 are placed below the reactor 800 so that the reactor 800 with a larger heat generation is located downstream of the heat dissipation airflow to prevent excessive heat from flowing through the contactor 900 and the charging resistor 1000, affecting the performance and life of the contactor 900 and the charging resistor 1000.

[0059] The independent air duct surrounded by the reactor mounting sheet metal 700 of the utility model can not only realize the effective heat dissipation of the reactor 800 and prevent the heat of the reactor 800 from flowing into other spaces and affecting other devices, but also can make full use of the reactor mounting sheet metal 700 to improve space utilization.

[0060] like Figure 1 As shown, in a specific embodiment of the utility model, a third electronic component is arranged in the cabinet 300, and the reactor mounting sheet metal 700 and the third electronic component are arranged in sequence along the width direction of the cabinet 300. So that the cabinet 300 is configured as at least two installation spaces in the width direction. One of the installation spaces is at least used to arrange the reactor mounting sheet metal 700 and the reactor 800 and the second electronic component in the reactor mounting cavity 701. The other installation space is at least used to arrange the third electronic component. Such an arrangement can make it easier to arrange the components in the cabinet 300 and improve the space utilization.

[0061] It should be noted that the third electronic component includes at least one of the power module 200 and the DC bus capacitor module 100. The power module 200 may be arranged below the DC bus capacitor module 100.

[0062] It should be noted that, in order to improve the integration of the modules, the DC bus capacitor module 100 and the power module 200 can be integrally mounted on a vertical plate (not shown in the figure), and then the vertical plate is integrally mounted in the cabinet 300. During maintenance, the vertical plate can be removed from the cabinet 300, or only the corresponding modules on the vertical plate can be removed.

[0063] The cabinet 300 is provided with an air outlet heat dissipation device and a third air inlet 303 for dissipating heat for the third electronic component (e.g., the DC bus capacitor module 100) on the side wall (the right side wall of the cabinet 300 in this embodiment) on which the third electronic component (e.g., the DC bus capacitor module 100) is arranged, so as to form a heat dissipation path for dissipating heat for the third electronic component. The third air inlet 303 can be arranged on the lower side of the air outlet heat dissipation device.

[0064] Since the DC bus capacitor module 100 generates a large amount of heat, two air outlet heat dissipation devices may be provided here, namely a first air outlet heat dissipation device 304 and a second air outlet heat dissipation device 305, each of which includes an air outlet and a cooling fan provided at the air outlet. It should be noted that the number of air outlet heat dissipation devices is not limited to one or two, and those skilled in the art may design them according to the requirements to ensure that effective heat dissipation requirements can be provided for the DC bus capacitor module 100 and other devices in the cabinet 300.

[0065] The cabinet 300 is provided with a corresponding heat dissipation duct for the DC bus capacitor module 100, and heat is dissipated through two air outlet heat dissipation devices on the right side. Without considering the heat dissipation effect, the independent air duct of the reactor 800 can also be combined with the air duct of the DC bus capacitor module 100, that is, the right side of the reactor installation cavity 701 is opened, and the heat dissipation of the reactor 800 is achieved by means of two air outlet heat dissipation devices of the DC bus capacitor module 100. It should be noted that the heat generation of the reactor 800 is very large, and its heat will affect the DC bus capacitor module 100 in the rear air duct, affecting the heat dissipation of the DC bus capacitor module 100, shortening the life of the DC bus capacitor module 100, and being not conducive to the reliability of the inverter. Therefore, in the above embodiment of the utility model, an independent heat dissipation duct is designed for the reactor 800.

[0066] The utility model embodiment also discloses an electrical device, including the frequency converter as described in any one of the above items. The electrical device disclosed in this embodiment can be an electric control cabinet, and the frequency converter disclosed in the above embodiment is installed in the cabinet of the electric control cabinet. It can also be an air conditioning unit using the above frequency converter, etc. This embodiment does not limit the specific product type of the electrical device, as long as the device can use the above frequency converter. The electrical device disclosed in this embodiment has the above frequency converter, so it has all the technical effects of the above frequency converter, which will not be repeated here.

[0067] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0069] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0070] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A frequency converter, characterized in that: It comprises a cabinet (300), a reactor (800) and a reactor mounting sheet metal (700); The reactor installation sheet metal (700) is fixed on the back plate (307) of the cabinet (300), and a reactor installation cavity (701) is formed between the reactor installation sheet metal and the back plate (307) of the cabinet (300), and the reactor (800) is arranged in the reactor installation cavity (701); A reactor installation cavity air outlet (306) communicating with the reactor installation cavity (701) is provided on the back plate (307) of the cabinet (300); a reactor installation cavity heat dissipation fan is provided at the reactor installation cavity air outlet (306); The cabinet (300) is provided with an air inlet which is in communication with the cavity of the cabinet (300).

2. The frequency converter according to claim 1, characterized in that: The reactor installation sheet metal (700) is in the form of a box structure with an opening, and the open side of the reactor installation sheet metal (700) is provided with a fixed folded edge (702) bent outwards, and the fixed folded edge (702) is attached to the back plate (307) of the cabinet (300) and fixed by a fastener.

3. The frequency converter according to claim 2, characterized in that: The reactor installation sheet metal (700) is provided with at least one reactor installation cavity air inlet connected to the reactor installation cavity (701), and the reactor (800) is arranged on a heat dissipation path between the reactor installation cavity air inlet and the reactor installation cavity air outlet (306).

4. The frequency converter according to claim 3, characterized in that: At least one air inlet of the reactor installation cavity is located on the lower side of the reactor installation sheet metal (700).

5. The frequency converter according to claim 2, characterized in that: The wall plate of the reactor installation sheet metal (700) opposite to its open side is a reactor installation back plate (703), and a first electronic component is installed on the side of the reactor installation back plate (703) facing away from the reactor installation cavity (701), and the heat generated by the first electronic component is less than the heat generated by the reactor (800).

6. The frequency converter according to claim 5, characterized in that: The first electronic component comprises at least one of a circuit breaker (600), an input copper busbar (400) and an incoming line grounding copper busbar (500).

7. The frequency converter according to any one of claims 1 to 6, characterized in that: A second electronic component is arranged in the reactor installation cavity (701), the heat generation of the second electronic component is lower than the heat generation of the reactor (800), and along the heat dissipation path of the reactor installation cavity (701), the reactor (800) and the second electronic component are arranged from low to high according to the heat generation; and / or The second electronic component includes at least one of a contactor (900) and a charging resistor (1000).

8. The frequency converter according to any one of claims 1 to 6, characterized in that: The air inlet at least comprises a first air inlet (301) and a second air inlet (302) respectively arranged on two sides of the bottom of the cabinet (300); and / or, A third electronic component is arranged in the cabinet (300), and the reactor mounting sheet metal (700) and the third electronic component are arranged in sequence along the width direction of the cabinet (300).

9. The frequency converter according to claim 8, characterized in that: An air outlet heat dissipation device and a third air inlet (303) are provided on a side wall of the cabinet (300) close to the third electronic component, so as to form a heat dissipation path for dissipating heat from the third electronic component.

10. An electrical device, characterized in that: Comprising the frequency converter as described in any one of claims 1 to 9.

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