Heat preservation device of frequency converter and frequency converter device

Abstract

The embodiment of the utility model relates to the field of frequency converters, and provides a heat preservation device of a frequency converter and a frequency converter device, and the frequency converter comprises a cold plate which comprises a first surface and a second surface which are opposite to each other; the first surface of the cold plate is provided with at least one power module, and the heat preservation device comprises a first heat preservation part located on the second surface of the cold plate; the second heat preservation part is located on the first surface of the cold plate, and the second heat preservation part is exposed out of the surface of the power module; the third heat preservation part is located on the side face of the cold plate, the side face of the first heat preservation part and the side face of the second heat preservation part. The heat preservation device of the frequency converter provided by the embodiment of the utility model at least can improve and even avoid the condensation problem.

Description

Technical Field

[0001] This utility model relates to the field of frequency converters, and in particular to a heat preservation device for a frequency converter and a frequency converter. Background Technology

[0002] With the rapid development of various industries, variable-frequency drives (VFDs) have been used more and more widely. Among them, the demand for high-power VFDs is also growing, such as the increasing demand for VFDs with power ratings of several hundred kW or even several MW.

[0003] Among these, the heat generated by high-power frequency inverters is considerable, and their application scenarios often have high requirements for space and noise control. The first method is traditional air cooling, but high-power inverters require high-power cooling systems, leading to large sizes and significant noise, which is difficult to meet usage requirements. The second method is water cooling, which offers significantly improved cooling performance compared to air-cooled inverters, but suffers from higher costs and difficulties in sealing the piping. The third method uses refrigerant inverters. Refrigerant inverters solve the problems of air-cooled and water-cooled inverters, offering high cooling efficiency, eliminating the need for complex piping systems, and significant advantages in cost and size, making them widely used in refrigeration and air conditioning.

[0004] However, to regulate the heat dissipation performance of the frequency converter, a throttling valve is installed before the refrigerant inlet. After the refrigerant flows through the throttling valve, both its pressure and temperature decrease. Under certain operating conditions, when the temperature on the frequency converter is lower than the ambient temperature, there may be a risk of condensation. Utility Model Content

[0005] This utility model provides a heat preservation device and a frequency converter, which at least helps to improve the relative humidity inside the frequency converter, thereby improving or even avoiding condensation problems.

[0006] According to some embodiments of the present invention, one aspect of the present invention provides a heat preservation device for a frequency converter, the frequency converter comprising: a cold plate, the cold plate comprising a first surface and a second surface opposite to each other; the first surface of the cold plate having at least one power module, the heat preservation device comprising: a first heat preservation part located on the second surface of the cold plate; a second heat preservation part located on the first surface of the cold plate, and the second heat preservation part exposing the surface of the power module; and a third heat preservation part located on the side of the cold plate, the side of the first heat preservation part, and the side of the second heat preservation part.

[0007] In some embodiments, the thickness of at least one of the first insulation portion, the second insulation portion, and the third insulation portion ranges from 10 mm to 17 mm.

[0008] In some embodiments, the thickness of the third insulation portion is less than or equal to the thickness of the second insulation portion.

[0009] In some embodiments, the thickness of the second insulation portion is less than or equal to the thickness of the first insulation portion.

[0010] In some embodiments, the cold plate has a water inlet, and the insulation device further includes a water inlet insulation sleeve located on the side of the water inlet.

[0011] In some embodiments, the cold plate has a water outlet, and the insulation device further includes: a water outlet insulation sleeve, the water outlet insulation sleeve being located on the side of the water outlet; the thickness of the water outlet insulation sleeve is less than the thickness of the water inlet insulation sleeve.

[0012] In some embodiments, the thickness of the water inlet insulation sleeve is greater than the thickness of the second insulation part.

[0013] In some embodiments, at least one of the first insulation portion or the second insulation portion has a mounting hole; the insulation device further includes an insulation layer, which is removably filled into the mounting hole.

[0014] In some embodiments, a fixing component is further included, the two ends of which are respectively connected to the insulation layer and the first insulation part.

[0015] According to some embodiments of the present invention, another aspect of the present invention provides a frequency converter device, comprising: a frequency converter, the frequency converter including a cold plate, the cold plate including a first surface and a second surface opposite to each other; the first surface of the cold plate having at least one power module; the cold plate having a water inlet and a water outlet; and a heat preservation device as described in any of the above embodiments.

[0016] The technical solution provided by this utility model embodiment has at least the following advantages:

[0017] The insulation device provided in this embodiment of the utility model provides insulation by setting a second insulation part on the first surface of the cold plate, a first insulation part on the second surface of the cold plate, and a third insulation part on the side of the cold plate. The cold plate is insulated in a relatively closed manner by the three relatively closed insulation parts, thereby reducing the temperature difference between the cold plate and the internal environment of the frequency converter, thereby reducing the relative humidity of the internal environment of the frequency converter, reducing the probability of condensation on the cold plate, and thus improving the safety and lifespan of the frequency converter. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a frequency converter device provided in an embodiment of this utility model;

[0020] Figure 2 This is another structural schematic diagram of the frequency converter device provided in one embodiment of the present utility model;

[0021] Figure 3 An exploded view of a frequency converter device provided in an embodiment of this utility model;

[0022] Figure 4 A schematic diagram of the structure of the first heat preservation part in a frequency converter device provided in an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the insulation layer in a frequency converter device according to an embodiment of the present invention. Detailed Implementation

[0024] As can be seen from the background technology, current frequency converters have a condensation problem.

[0025] This utility model provides a heat preservation device for a frequency converter and a frequency converter device. The cold plate is insulated by the first heat preservation part, the second heat preservation part and the third heat preservation part, thereby reducing the relative humidity inside the frequency converter and improving or even avoiding the condensation problem.

[0026] In the description of the embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of this utility model embodiment, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this utility model, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this utility model, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0031] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0032] In the accompanying drawings corresponding to the embodiments of this utility model, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0033] In the description of the embodiments of this utility model, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or it can have another component present in between. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located in between.

[0034] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "part" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0035] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0036] According to some embodiments of the present invention, one embodiment of the present invention provides a heat preservation device for a frequency converter to improve the condensation problem that occurs inside and outside the frequency converter.

[0037] Figure 1 A schematic diagram of a frequency converter device provided in an embodiment of this utility model; Figure 2 This is another structural schematic diagram of the frequency converter device provided in one embodiment of the present utility model; Figure 3An exploded view of a frequency converter device provided in an embodiment of this utility model.

[0038] It should be noted that, in order to illustrate the correspondence between the insulation device and the frequency converter, Figures 1-3 The image shows a frequency converter device that includes a frequency conversion zone and a heat preservation device.

[0039] refer to Figures 1-3 The inverter includes: a cold plate 1, which includes a first surface (not shown in the figure) and a second surface (not shown in the figure); the first surface of the cold plate 1 has at least one power module 3. The insulation device includes: a first insulation portion 5, located on the second surface of the cold plate 1. The insulation device includes: a second insulation portion 4, located on the first surface of the cold plate 1, and exposing the surface of the power module 3. The insulation device includes: a third insulation portion 6, located on the side of the cold plate 1, the side of the first insulation portion 5, and the side of the second insulation portion 4.

[0040] In some embodiments, the frequency converter can be any one of a low-voltage frequency converter, a high-voltage frequency converter, an AC-AC frequency converter, an AC-DC-AC frequency converter, a voltage-source frequency converter, and a current-source frequency converter. This application does not limit the type of frequency converter.

[0041] In some embodiments, the power module 3 may be composed of power semiconductor devices, responsible for converting the input power frequency electrical energy into output electrical energy with variable frequency and variable voltage, thereby meeting the needs of motor control. The power semiconductor devices may be IGBTs (Insulated Gate Bipolar Transistors), GTRs (Gate Turn-Off Thyristors), IPMs (Intelligent Power Modules), or MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors).

[0042] The cold plate 1 is mainly used to cool down the power module 3 so that the temperature of the power module 3 can approach a working temperature, avoiding thermal problems caused by high temperature of the power module 3 and malfunction caused by low temperature.

[0043] The cooling medium in cold plate 1 is a refrigerant, which is a substance that transfers heat through evaporation and condensation. Refrigerants can be Freon, alkanes, ammonia, carbon dioxide, etc.

[0044] The material of the cold plate 1 can be a material with a certain strength and high thermal conductivity, such as aluminum. The cold plate 1 has multiple flow channels, and the cooling medium flows in the flow channels to dissipate heat from the devices on the cold plate 1, such as the power module 3 on the cold plate 1.

[0045] In some embodiments, the power module 3 is located on the first surface of the cold plate 1 so that the cold plate 1 provides heat dissipation for the power module 3. A thermally conductive material is coated between the cold plate 1 and the power module 3. The thermally conductive material is used to fill the gap between the cold plate 1 and the power module 3, reduce thermal resistance, enhance thermal conductivity, and thus improve the heat dissipation performance of the cold plate 1.

[0046] In some embodiments, the material of the first insulation part 5 may be polystyrene foam, polyurethane foam, aerogel material, phenolic material, rubber and plastic insulation material, thermosetting modified polystyrene material, rock wool material, inorganic fiber spraying material, glass wool material, and foam glass insulation material, etc.

[0047] In some embodiments, the first heat-insulating part 5 has a heat-insulating part and an insulating part to avoid electrical short circuits between adjacent power modules 3.

[0048] In some embodiments, the thermal conductivity of the first insulation part 5 is in the range of 0.04 W / (m·K) to 0.06 W / (m·K). The thermal conductivity of the first insulation part 5 can provide a certain degree of insulation for the cold plate 1, thereby making the temperature difference between the cold plate 1 and the external environment smaller, which can reduce the probability of condensation.

[0049] The thermal conductivity of the first insulation part 5 can be 0.04 W / (m·K), 0.043 W / (m·K), 0.048 W / (m·K), 0.052 W / (m·K), 0.056 W / (m·K), or 0.06 W / (m·K).

[0050] In some embodiments, the thickness of the first insulation portion 5 ranges from 10 mm to 17 mm. This thickness range ensures that the first insulation portion 5 has sufficient thickness to balance the temperature difference between the cold plate 1 and the external environment, thereby reducing the risk of condensation. Furthermore, the thickness of the first insulation portion 5 should not be too thick to reduce manufacturing costs and improve the integration of the inverter device.

[0051] The thickness of the first insulation part 5 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm or 17mm.

[0052] In some embodiments, the material of the second insulation part 4 may be polystyrene foam, polyurethane foam, aerogel material, phenolic material, rubber and plastic insulation material, thermosetting modified polystyrene material, rock wool material, inorganic fiber spraying material, glass wool material, and foam glass insulation material, etc.

[0053] In some embodiments, the thermal conductivity of the second insulation part 4 ranges from 0.04 W / (m·K) to 0.08 W / (m·K). This range of thermal conductivity allows the second insulation part 4 to not only provide a certain degree of insulation for the cold plate 1, thereby reducing the temperature difference between the cold plate 1 and the external environment and thus reducing the probability of condensation, but also to improve the heat dissipation performance of the power module 3, thereby improving the heat dissipation effect of the power module 3.

[0054] The thermal conductivity of the second insulation part 4 can be 0.04 W / (m·K), 0.045 W / (m·K), 0.049 W / (m·K), 0.053 W / (m·K), 0.058 W / (m·K), 0.063 W / (m·K), 0.068 W / (m·K), 0.076 W / (m·K), or 0.08 W / (m·K).

[0055] In some embodiments, the second heat insulation part 4 is a certain distance from the power module 3 so that there is no obstruction near the power module 3, thereby allowing the heat of the power module 3 to be dissipated quickly and by air cooling.

[0056] In some embodiments, a heat-conducting component is provided between the second insulation part 4 and the power module 3, so that the heat of the power module 3 can be quickly dissipated into the environment.

[0057] In some embodiments, the thickness of the second insulation portion 4 ranges from 10 mm to 17 mm. This thickness range ensures that the second insulation portion 4 has sufficient thickness to balance the temperature difference between the cold plate 1 and the external environment, thereby reducing the risk of condensation. It also prevents the second insulation portion 4 from excessively obstructing the power module 3, thus affecting the heat dissipation performance of the power module 3.

[0058] The thickness of the second insulation part 4 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm or 17mm.

[0059] In some embodiments, the thermal conductivity of the first insulation part 5 is less than that of the second insulation part 4, so that the first insulation part 5 has better insulation performance for the cold plate 1, and the second insulation part 4 can partially dissipate heat from the power module 3.

[0060] In some embodiments, the thickness of the second insulation portion 4 is less than or equal to the thickness of the first insulation portion 5, so that the second insulation portion 4 can cause less obstruction to the power module 3. Secondly, the second insulation portion 4 is close to the power module 3, and the temperature corresponding to the second insulation portion 4 is lower than the temperature of the first insulation portion 5. Setting the thickness of the second insulation portion 4 to be less than or equal to the thickness of the first insulation portion 5 can reduce manufacturing costs while ensuring that the ambient temperatures corresponding to the first insulation portion 5 and the second insulation portion 4 are similar, thereby reducing relative humidity and the probability of condensation.

[0061] In some embodiments, the material of the third insulation part 6 may be polystyrene foam, polyurethane foam, aerogel material, phenolic material, rubber and plastic insulation material, thermosetting modified polystyrene material, rock wool material, inorganic fiber spraying material, glass wool material, and foam glass insulation material, etc.

[0062] In some embodiments, the thermal conductivity of the third insulation part 6 ranges from 0.03 W / (m·K) to 0.06 W / (m·K). The thermal conductivity of the third insulation part 6 can be 0.033 W / (m·K), 0.038 W / (m·K), 0.04 W / (m·K), 0.045 W / (m·K), 0.049 W / (m·K), 0.053 W / (m·K), 0.058 W / (m·K), or 0.06 W / (m·K).

[0063] In some embodiments, the thickness of the third insulation portion 6 ranges from 10 mm to 17 mm. This thickness range ensures that the third insulation portion 6 has sufficient thickness to balance the temperature difference between the cold plate 1 and the external environment, thereby reducing the risk of condensation. Furthermore, the thickness of the third insulation portion 6 should not be too thick to reduce manufacturing costs and improve the integration of the inverter device.

[0064] The thickness of the third insulation part 6 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm or 17mm.

[0065] In some embodiments, the thickness of the third insulation portion 6 is less than or equal to the thickness of the second insulation portion 4. The thickness of the third insulation portion 6 can be less than the thickness of the second insulation portion 4, thereby reducing the manufacturing cost of the insulation device.

[0066] In some embodiments, continue to refer to Figure 1 The cold plate 1 has a water inlet 21. The water inlet 21 can be a cooling pipe, which is pressed into the flow channel groove through a pressing process. The material of the cooling pipe is selected to balance high thermal conductivity and processability, for example, copper.

[0067] The insulation device also includes: a water inlet insulation sleeve 71, which is located on the side of the water inlet 21.

[0068] In some embodiments, the thickness of the water inlet insulation sleeve 71 is greater than the thickness of the second insulation part 4. Since the water inlet insulation sleeve 71 is the water inlet, the temperature of the cooling medium is the highest. Setting the thickness of the water inlet insulation sleeve 71 to be greater than the thickness of the second insulation part 4 can reduce the probability of condensation.

[0069] In some embodiments, continue to refer to Figure 2 The cold plate 1 has a water outlet 22. The water outlet 22 can be a cooling pipe, which is pressed into the flow channel groove through a pressing process. The material of the cooling pipe is selected to balance high thermal conductivity and ease of processing, such as copper.

[0070] In some embodiments, the heat preservation device further includes: an outlet heat preservation sleeve 72, which is located on the side of the outlet 22; the thickness of the outlet heat preservation sleeve 72 is less than the thickness of the inlet heat preservation sleeve 71.

[0071] Figure 4 A schematic diagram of the structure of the first heat preservation part in a frequency converter device provided in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the insulation layer in a frequency converter device according to an embodiment of the present invention.

[0072] In some embodiments, reference Figure 4 The first insulation section 5 has a mounting hole 501; it also includes an insulation layer 8, which is removably filled into the mounting hole 501. The insulation layer 8 balances ease of installation with good insulation performance of the entire device, thereby preventing condensation.

[0073] In some embodiments, reference Figure 3 The second insulation section 4 has mounting holes 401; the insulation layer 8 is removable and fills the mounting holes 401. The insulation layer 8 balances ease of installation with good insulation performance of the entire device, thus preventing condensation.

[0074] In some embodiments, the material of the insulation layer 8 may be polystyrene foam, polyurethane foam, aerogel material, phenolic material, rubber and plastic insulation material, thermosetting modified polystyrene material, rock wool material, inorganic fiber spraying material, glass wool material, and foam glass insulation material, etc.

[0075] In some embodiments, the thickness of the insulation layer 8 is 5cm to 10cm, which is less than the thickness of the first insulation part 5. The thickness range of the insulation layer 8 can make the area corresponding to the mounting hole have good insulation performance and will not protrude too much from the first insulation part 5, thereby causing interference to other devices.

[0076] The thickness of the insulation layer 8 is 5cm, 6cm, 7cm, 8cm, 9cm or 10cm.

[0077] In some embodiments, a fixing component is further included, with the two ends of the fixing component respectively connected to the insulation layer and the first insulation part 5.

[0078] In some embodiments, the first insulation part 5, the second insulation part 4, the third insulation part 6, the water outlet insulation sleeve, and the water inlet insulation sleeve are bonded to the cold plate 1.

[0079] In some embodiments, the third insulation part 6 has a hole 601 for accommodating the water inlet 21 and the water outlet 22.

[0080] The heat preservation device provided in this embodiment of the utility model provides a second heat preservation part 4 on the first surface of the cold plate 1, a first heat preservation part 5 on the second surface of the cold plate 1, and a third heat preservation part 6 on the side of the cold plate 1. The cold plate 1 is insulated in a relatively closed manner through the three relatively closed heat preservation parts, thereby reducing the temperature difference between the cold plate 1 and the internal environment of the frequency converter, thereby reducing the relative humidity of the internal environment of the frequency converter, reducing the probability of condensation on the cold plate 1, and thus improving the safety and life of the frequency converter.

[0081] According to some embodiments of the present invention, another aspect of the present invention provides a frequency converter device, including: a frequency converter, the frequency converter including a cold plate 1, the cold plate 1 including a first surface and a second surface opposite to each other; the first surface of the cold plate 1 having at least one power module 3; the cold plate 1 having a water inlet and a water outlet; and a heat preservation device as described in any of the above embodiments.

[0082] Those skilled in the art will understand that the above embodiments are specific examples of implementing this utility model, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this utility model. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this utility model; therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A heat preservation device for a frequency converter, the frequency converter comprising: A cold plate, the cold plate comprising opposing first and second surfaces; The first surface of the cold plate has at least one power module, characterized in that the heat preservation device comprises: The first insulation part is located on the second surface of the cold plate; The second insulation part is located on the first surface of the cold plate and exposes the surface of the power module; The third insulation section is located on the side of the cold plate, the side of the first insulation section, and the side of the second insulation section.

2. The heat preservation device for the frequency converter according to claim 1, characterized in that, The thickness of at least one of the first insulation part, the second insulation part, and the third insulation part ranges from 10 mm to 17 mm.

3. The heat preservation device for the frequency converter according to claim 1 or 2, characterized in that, The thickness of the third insulation part is less than or equal to the thickness of the second insulation part.

4. The heat preservation device for the frequency converter according to claim 3, characterized in that, The thickness of the second insulation part is less than or equal to the thickness of the first insulation part.

5. The insulation device for the frequency converter according to claim 1, wherein the cold plate has a water inlet, characterized in that, The insulation device further includes a water inlet insulation sleeve, which is located on the side of the water inlet.

6. The insulation device for the frequency converter according to claim 5, wherein the cold plate has a water outlet, characterized in that, The insulation device further includes: an outlet insulation sleeve, which is located on the side of the water outlet; the thickness of the outlet insulation sleeve is less than the thickness of the inlet insulation sleeve.

7. The heat preservation device for the frequency converter according to claim 5, characterized in that, The thickness of the inlet insulation sleeve is greater than the thickness of the second insulation part.

8. The heat preservation device for the frequency converter according to claim 1, characterized in that, At least one of the first insulation part or the second insulation part has a mounting hole; the insulation device further includes an insulation layer, which is removably filled into the mounting hole.

9. The heat preservation device for the frequency converter according to claim 8, characterized in that, It also includes a fixing component, the two ends of which are respectively connected to the insulation layer and the first insulation part.

10. A frequency converter device, characterized in that, include: A frequency converter, the frequency converter including a cold plate, the cold plate including a first surface and a second surface opposite each other; the first surface of the cold plate having at least one power module; the cold plate having an inlet and an outlet; The heat preservation device as described in any one of claims 1 to 9.

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