A novel capacitor fixing protection structure for frequency converter

Abstract

This utility model discloses a novel capacitor fixing and protection structure for frequency converters, specifically relating to the field of power electronic equipment technology. It includes a frequency converter housing, a base, and an outer cover. The base is fixedly installed inside the frequency converter housing. Multiple annular threaded grooves are formed on the upper surface of the base, and positioning rings are disposed within these grooves. A protective mechanism is provided above the base to cover the capacitor. The protective mechanism includes columns located on the left and right sides above the base, with an outer cover fixed between two columns. This device uses designed threaded grooves to select positioning rings of the required size and installs them on the base through the corresponding threaded grooves. The capacitor is then placed inside the positioning ring for initial positioning, facilitating subsequent installation work. It also achieves compatible positioning for capacitors of various specifications, overcoming the limitations of traditional fixing structures that only adapt to a single size, and allows for rapid disassembly and replacement of the positioning rings.

Description

Technical Field

[0001] This utility model relates to the field of power electronic equipment, and in particular to a novel capacitor fixing and protection structure for frequency converters. Background Technology

[0002] As a core power electronic device for realizing motor speed regulation and energy-saving control, frequency converters are widely used in industrial production, new energy, rail transportation and other fields. As a key energy storage and filtering component of frequency converters, the installation stability and operational safety of capacitors directly determine the overall performance and service life of frequency converters. If the capacitor is loosely fixed or the protection fails, it will lead to increased output harmonics and energy consumption of the frequency converter, or even cause the capacitor to overheat and explode, equipment to shut down, or even cause safety accidents such as fire. Therefore, the fixed protection structure of the capacitor is an indispensable key link in the design of frequency converters.

[0003] Patent document CN209045360U discloses a capacitor fixing structure and a frequency converter. The capacitor fixing structure includes a first hoop sleeved at a first position of the capacitor and a second hoop sleeved at a second position of the capacitor, wherein the first hoop and the second hoop are both closed rings. The first hoop is made of a telescopic material and tightens the capacitor by changing its circumference through telescoping. The second hoop is made of an elastic material and has multiple circumferentially arranged hoop teeth, which tighten the capacitor by tightening the capacitor. This utility model fixes the capacitor at different positions by using the first hoop and the second hoop, which makes the capacitor fixing more reliable and the capacitor does not need to bear bending moment. Furthermore, since the first hoop and the second hoop are closed rings, the capacitor can be automatically locked, making operation convenient.

[0004] Existing fixed protection structures typically use fasteners to surround and secure capacitors, which are then fixed to the inverter housing with screws. Since inverter capacitors often have different outer diameters and heights depending on power, voltage rating, and other requirements, the existing fasteners are fixed in size. If the capacitor's outer diameter is smaller than the fastener's limit size, a horizontal gap will exist after the capacitor is fixed. Vibrations during equipment operation will cause frequent collisions between the capacitor and the fastener, generating noise, potentially damaging the capacitor's insulation layer, and even loosening the capacitor leads. If the capacitor's outer diameter is larger than the fastener's limit size, the capacitor cannot be installed, requiring the fastener to be removed from the inverter housing and replaced with a suitable one. Furthermore, the fasteners and capacitors are usually fixed with screws, requiring tools to open the fasteners and remove the capacitor for maintenance, a cumbersome process. Therefore, we propose a novel fixed protection structure for inverter capacitors. Utility Model Content

[0005] The main purpose of this utility model is to provide a novel capacitor fixing and protection structure for frequency converters, which can effectively solve the problems mentioned above.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A novel capacitor fixing and protection structure for a frequency converter includes a frequency converter housing, a base, and an outer cover, wherein the base is fixedly installed inside the frequency converter housing.

[0008] The upper surface of the base is provided with multiple annular threaded grooves, and a positioning ring is provided in the threaded grooves;

[0009] A protective mechanism is provided above the base to cover the outside of the capacitor;

[0010] The protective mechanism includes columns located on the left and right sides above the base, an outer cover is fixed between the two columns, and a top plate is fixed between the tops of the two columns.

[0011] A fixing mechanism is fixedly installed between the bottom of the column and the top of the base.

[0012] Preferably, the plurality of said threaded grooves are coaxial.

[0013] Preferably, the locating ring has a thread below its surface that matches the threaded groove.

[0014] Preferably, the top of the top plate has a plurality of pin holes evenly provided for the capacitor pins to extend out.

[0015] Preferably, the protective mechanism further includes a telescopic plate that is vertically slidably disposed at the top of the inner cavity of the top plate, and an elastic mechanism is fixedly disposed between the top of the telescopic plate and the top of the inner cavity of the top plate.

[0016] Preferably, the elastic mechanism includes telescopic columns and a first spring. Multiple telescopic columns are arranged in a circular array along the top circumference of the telescopic plate. The first spring is provided on the surface of the telescopic columns. A corresponding number of through holes are opened on the top of the telescopic plate at positions corresponding to the pin holes.

[0017] Preferably, the fixing mechanism includes mounting shells fixedly disposed on the left and right sides of the top of the base. A frustum is vertically slidably disposed inside the mounting shell. The top of the frustum is fixedly connected to the bottom of the column. Round rods are horizontally slidably disposed on the left and right sides of the mounting shell. One end of the round rod near the frustum slides into the inner cavity of the mounting shell, and a right-angled trapezoidal locking block is fixedly disposed at the inserted end. The inclined surface of the locking block faces the conical surface of the frustum. The locking block is located in the inner cavity of the mounting shell. A second spring is disposed on the surface of the end of the round rod that extends into the inner cavity of the mounting shell. The second spring is located between the side wall of the inner cavity of the mounting shell and the side wall of the locking block.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This device uses a designed threaded groove to select a positioning ring of the required size and install it on the base through the corresponding threaded groove. Then, the capacitor is placed inside the positioning ring for initial positioning, which facilitates subsequent installation work. At the same time, it achieves compatible positioning for capacitors of various specifications, solving the limitation of "single-size adaptation" of traditional fixed structures, and can quickly complete the disassembly and replacement of the positioning ring. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the base structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the protective mechanism structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the top plate of this utility model;

[0024] Figure 5 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0025] In the diagram: 1. Inverter housing; 2. Base; 21. Threaded groove; 3. Positioning ring; 31. Thread; 4. Protective mechanism; 41. Column; 42. Outer cover; 43. Top plate; 431. Pin hole; 44. Telescopic plate; 45. Elastic mechanism; 451. Telescopic column; 452. First spring; 5. Fixing mechanism; 51. Mounting shell; 52. Frustum; 53. Round rod; 54. Locking block; 55. Second spring. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] Example 1, as Figures 1-5 As shown, a novel inverter capacitor fixing and protection structure includes an inverter housing 1, a base 2 and an outer cover 42, wherein the base 2 is fixedly installed in the inner cavity of the inverter housing 1.

[0028] The upper surface of the base 2 is provided with multiple annular threaded grooves 21, and a positioning ring 3 is provided in the threaded grooves 21.

[0029] A protective mechanism 4 is provided above the base 2 to cover the outside of the capacitor;

[0030] The protective mechanism 4 includes columns 41 located on the left and right sides above the base 2, an outer cover 42 is fixed between the two columns 41, and a top plate 43 is fixed between the tops of the two columns 41.

[0031] A fixing mechanism 5 is fixedly installed between the bottom of the column 41 and the top of the base 2;

[0032] In this process, a positioning ring 3 of the required size is selected and installed on the base 2 through the corresponding threaded groove 21. Then, the capacitor is placed inside the positioning ring 3 for initial positioning. The protective mechanism 4 is used to fix the capacitor, and the fixing mechanism 5 is used to fix the base 2 and the protective mechanism 4.

[0033] Based on the outer diameter of the capacitor to be fixed, select a positioning ring 3 with a matching inner diameter and screw the positioning ring 3 into the corresponding threaded groove 21. This facilitates the compatible positioning of capacitors of various specifications. At the same time, the annular positioning ring 3 can radially limit the capacitor from the outer periphery of the bottom, thus providing initial positioning for the capacitor and facilitating subsequent installation.

[0034] Next, the protective mechanism 4 is placed over the capacitor and fixedly mounted on the base 2 by the fixing mechanism 5. When the protective mechanism 4 is lowered, the top plate 43 forms an axial pressing force on the capacitor to fix it and prevent the capacitor from shifting due to vibrations generated during the subsequent operation of the frequency converter, which could cause pin bending or other issues affecting normal use. After fixing, the outer cover 42 completely covers the outer periphery of the capacitor, protecting it and preventing accidental collisions between other components inside the frequency converter and the capacitor. This helps to improve the installation stability and service life of the frequency converter capacitor.

[0035] In Example 2, to facilitate the installation of the positioning ring 3, therefore, as follows: Figure 2 As shown, multiple threaded grooves 21 are made coaxial;

[0036] The locating ring 3 has a thread 31 that matches the threaded groove 21 on its lower surface.

[0037] According to the outer diameter of the capacitor to be fixed, select a positioning ring 3 with a matching inner diameter, and use the thread 31 on the lower surface of the positioning ring 3 that is compatible with the thread groove 21 to screw the positioning ring 3 into the corresponding thread groove 21.

[0038] It enables compatible positioning of capacitors of various specifications, overcomes the limitations of traditional fixed structures that only adapt to a single size, and allows for the rapid disassembly and replacement of the positioning ring 3.

[0039] Example 3: Considering that capacitors of different specifications have different heights, therefore, as follows... Figure 1 , Figure 3 and Figure 4As shown, the top plate 43 is provided with a plurality of pin holes 431 evenly distributed on its top surface for the capacitor pins to extend out.

[0040] The protective mechanism 4 also includes a telescopic plate 44 that is vertically slidably disposed at the top of the inner cavity of the top plate 43, and an elastic mechanism 45 is fixedly disposed between the top of the telescopic plate 44 and the top of the inner cavity of the top plate 43.

[0041] The elastic mechanism 45 includes a telescopic column 451 and a first spring 452. Multiple telescopic columns 451 are arranged in a circular array along the top circumference of the telescopic plate 44. The first spring 452 is provided on the surface of the telescopic column 451. A corresponding number of through holes are opened on the top of the telescopic plate 44 at the position corresponding to the pin hole 431.

[0042] When the protective mechanism 4 is lowered, the capacitor leads pass through the lead holes 431. Then, the top of the capacitor contacts the bottom of the telescopic plate 44. As the protective mechanism 4 continues to move downward, the telescopic plate 44 slides upward under the reaction force of the capacitor, compressing the telescopic column 451 and the first spring 452. After the fixing mechanism 5 completes the fixing of the base 2 and the protective mechanism 4, the rebound force of the first spring 452 is transmitted to the top of the capacitor through the telescopic plate 44, forming an axial pressing force on the capacitor.

[0043] On the one hand, the axial clamping force of the elastic mechanism 45 can counteract the axial movement of the capacitor when the equipment vibrates; on the other hand, it facilitates the clamping and fixing of capacitors of different specifications.

[0044] In Example 4, to facilitate the installation and fixation of the protective mechanism 4 to the base 2, therefore, as follows: Figure 5 As shown, the fixing mechanism 5 includes a mounting shell 51 fixedly installed on the left and right sides of the top of the base 2. A frustum 52 is vertically slidably installed in the inner cavity of the mounting shell 51. The top of the frustum 52 is fixedly connected to the bottom of the column 41. Round rods 53 are horizontally slidably installed on the left and right sides of the mounting shell 51.

[0045] One end of the round rod 53 near the frustum 52 slides into the inner cavity of the mounting shell 51, and a right-angled trapezoidal locking block 54 is fixedly provided at the end of the rod. The inclined surface of the locking block 54 faces the conical surface of the frustum 52. The locking block 54 is located in the inner cavity of the mounting shell 51. A second spring 55 is provided on the surface of the end of the round rod 53 that extends into the inner cavity of the mounting shell 51. The second spring 55 is located between the side wall of the inner cavity of the mounting shell 51 and the side wall of the locking block 54.

[0046] When the column 41 applies downward pressure to the top of the frustum 52, the frustum 52 slides vertically downward along the inner cavity of the mounting shell 51.

[0047] The conical surface of the frustum 52 gradually contacts the inclined surface of the locking block 54. As the frustum 52 continues to move downward, the squeezing force of the conical surface on the inclined surface causes the locking block 54 to overcome the elastic force of the second spring 55, driving the round rod 53 to slide outward from the mounting shell 51.

[0048] When the frustum 52 slides down to the bottom of the locking block 54, the locking block 54 returns to the center of the mounting shell 51 under the action of the rebound force of the second spring 55. At this time, the bottom of the locking block 54 is tightly fitted with the top of the frustum 52, forming an axial limit on the frustum 52. Thus, the frustum 52 cannot slide upward, and the relative position of the column 41 and the mounting shell 51 is locked, thereby fixing the base 2 and the protective mechanism 4, realizing the convenient operation of pressing and locking, and fixing can be completed without additional tools.

[0049] If the protective mechanism 4 needs to be disassembled, simply pull the round rod 53 outward from the mounting shell 51 to move the locking block 54 away from the top of the truncated cone 52, and the protective mechanism 4 can be taken out upward, taking into account both the ease of installation and the flexibility of disassembly.

[0050] In specific use, according to the outer diameter of the capacitor to be fixed, select a positioning ring 3 with a matching inner diameter, and use the thread 31 on the lower surface of the positioning ring 3 that is adapted to the thread groove 21 to screw the positioning ring 3 into the corresponding thread groove 21.

[0051] Then the capacitor is placed inside the positioning ring 3 for initial positioning;

[0052] When the protective mechanism 4 is lowered, the capacitor leads pass through the lead holes 431. Then, the top of the capacitor first contacts the bottom of the telescopic plate 44. As the protective mechanism 4 continues to move downward, the telescopic plate 44 slides upward under the reaction force of the capacitor, compressing the telescopic column 451 and the first spring 452. Until the fixing mechanism 5 completes the fixing of the base 2 and the protective mechanism 4, the rebound force of the first spring 452 is transmitted to the top of the capacitor through the telescopic plate 44, forming an axial pressing force on the capacitor.

[0053] During this process, when the column 41 applies downward pressure to the top of the frustum 52, the frustum 52 slides vertically downward along the inner cavity of the mounting shell 51.

[0054] The conical surface of the frustum 52 gradually contacts the inclined surface of the locking block 54. As the frustum 52 continues to move downward, the squeezing force of the conical surface on the inclined surface causes the locking block 54 to overcome the elastic force of the second spring 55, driving the round rod 53 to slide outward from the mounting shell 51.

[0055] When the frustum 52 slides down to the bottom of the locking block 54, the locking block 54 returns to the center of the mounting shell 51 under the action of the rebound force of the second spring 55. At this time, the bottom of the locking block 54 is tightly fitted with the top of the frustum 52, forming an axial limit on the frustum 52. Thus, the frustum 52 cannot slide upward, and the relative position of the column 41 and the mounting shell 51 is locked, thereby fixing the base 2 and the protective mechanism 4, realizing the convenient operation of pressing and locking, and fixing can be completed without additional tools.

[0056] If the protective mechanism 4 needs to be disassembled, simply pull the round rod 53 outward from the mounting shell 51 to disengage the locking block 54 from the top of the truncated cone 52, and the protective mechanism 4 can be removed upward.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel variable frequency drive capacitor fixation protection structure, comprising a variable frequency drive shell (1), a base (2) and an outer cover (42), characterized in that: The base (2) is fixedly installed inside the inverter housing (1); The upper surface of the base (2) is provided with a plurality of annular threaded grooves (21), and a positioning ring (3) is provided in the threaded grooves (21). A protective mechanism (4) is provided above the base (2) for covering the outside of the capacitor; The protective mechanism (4) includes columns (41) located on the left and right sides above the base (2), an outer cover (42) is fixed between the two columns (41), and a top plate (43) is fixed between the tops of the two columns (41). A fixing mechanism (5) is fixedly installed between the bottom of the column (41) and the top of the base (2); Among them, a positioning ring (3) of the required size is selected and installed on the base (2) through the corresponding threaded groove (21). Then, the capacitor is placed in the positioning ring (3) for initial positioning. The protective mechanism (4) is used to fix the capacitor, and the fixing mechanism (5) is used to fix the base (2) and the protective mechanism (4).

2. The novel capacitor fixation protection structure of frequency converter according to claim 1, characterized in that: Multiple of the aforementioned threaded grooves (21) are coaxial.

3. The novel inverter capacitor fixing and protection structure according to claim 1, characterized in that: The positioning ring (3) has a thread (31) below its surface that is compatible with the threaded groove (21).

4. The novel capacitor fixation protection structure of frequency converter according to claim 1, characterized in that: The top plate (43) has a plurality of pin holes (431) evenly distributed on its top for extending the capacitor pins.

5. The novel capacitor fixation protection structure of frequency converter according to claim 1, characterized in that: The protective mechanism (4) further includes a telescopic plate (44) that is vertically slidably disposed at the top of the inner cavity of the top plate (43), and an elastic mechanism (45) is fixedly disposed between the top of the telescopic plate (44) and the top of the inner cavity of the top plate (43).

6. The novel capacitor fixation protection structure of frequency converter according to claim 5, characterized in that: The elastic mechanism (45) includes a telescopic column (451) and a first spring (452). Multiple telescopic columns (451) are arranged in a circular array along the top of the telescopic plate (44). The first spring (452) is provided on the surface of the telescopic column (451). A corresponding number of through holes are opened at the top of the telescopic plate (44) corresponding to the pin hole (431).

7. The novel capacitor fixation protection structure of frequency converter according to claim 1, characterized in that: The fixing mechanism (5) includes a mounting shell (51) fixedly installed on the left and right sides of the top of the base (2). A frustum (52) is vertically slidably installed in the inner cavity of the mounting shell (51). The top of the frustum (52) is fixedly connected to the bottom of the column (41). A round rod (53) is horizontally slidably installed on the left and right sides of the mounting shell (51). One end of the round rod (53) near the frustum (52) slides into the inner cavity of the mounting shell (51), and a right-angled trapezoidal locking block (54) is fixedly installed at the end of the rod. The inclined surface of the locking block (54) faces the conical surface of the frustum (52). The locking block (54) is located in the inner cavity of the mounting shell (51). A second spring (55) is installed on the surface of one end of the round rod (53) that extends into the inner cavity of the mounting shell (51). The second spring (55) is located between the side wall of the inner cavity of the mounting shell (51) and the side wall of the locking block (54).

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