Frequency converter

Abstract

The utility model discloses a frequency converter, relates to the frequency converter technical field, the frequency converter comprises a housing, a mounting seat and a support assembly, the housing forms an accommodation cavity and an opening communicated with the accommodation cavity, the mounting seat is provided with an electric reactor, the mounting seat can slide into the accommodation cavity through the opening along the first direction of the housing, the support assembly is arranged at the opening, and the electric reactor is arranged on the support assembly. And the supporting assembly is provided with a sliding surface for the mounting seat to slide. According to the technical scheme provided by the utility model, the technical problem that the reactor of the frequency converter is difficult to install can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of variable frequency drives, and particularly relates to a variable frequency drive. Background Art

[0002] A variable frequency drive (VFD for short) is a power control device that applies frequency conversion technology and microelectronics technology to control an electric current motor by changing the frequency of the motor's working power supply. When assembling a variable frequency drive, it is usually necessary to install a reactor inside the housing of the variable frequency drive. Currently, the reactor is mainly installed from above or below the housing, which has the problem of difficult installation.

[0003] Therefore, it is necessary to provide a new variable frequency drive to solve the above technical problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a variable frequency drive, aiming to solve the technical problem of difficult installation of the reactor of the variable frequency drive.

[0005] To achieve the above purpose, a variable frequency drive proposed by the utility model includes:

[0006] A housing, the housing is formed with a receiving cavity and an opening communicating with the receiving cavity;

[0007] A mounting seat, the mounting seat is provided with a reactor, and the mounting seat can slide into the receiving cavity along a first direction of the housing through the opening;

[0008] A support assembly, the support assembly is disposed at the opening, and the support assembly is provided with a sliding surface for the mounting seat to slide.

[0009] In one embodiment, the support assembly includes a plurality of support blocks spaced along a second direction of the housing, and each support block is provided with the sliding surface.

[0010] In one embodiment, the support assembly includes a support block extending along the second direction of the housing, and the support block is provided with the sliding surface.

[0011] In one embodiment, the support assembly includes a plurality of pulleys spaced along the second direction of the housing, each pulley is rotatably disposed on the housing, and the sliding surface includes the outer circumferential surfaces of the pulleys.

[0012] In one embodiment, the variable frequency drive further includes a limiting block disposed in the receiving cavity, and the limiting block can abut against one side of the mounting seat along the second direction to limit the sliding position of the mounting seat.

[0013] In one embodiment, the number of the limiting blocks is two. The two limiting blocks are arranged at intervals, and the two limiting blocks can respectively abut against two sides of the mounting base along the second direction to limit the sliding-in position of the mounting base.

[0014] In one embodiment, the frequency converter further includes a fixing member disposed in the accommodating cavity, and the fixing member can be connected to the mounting base.

[0015] In one embodiment, two ends of the fixing member are respectively connected to one ends of the two limiting blocks away from the opening.

[0016] In one embodiment, the mounting base is provided with a locking member, and two ends of the locking member can be respectively connected to one ends of the two limiting blocks close to the opening.

[0017] In one embodiment, the sliding surface is a convex surface.

[0018] The technical solution of the present utility model adopts a drawer-type installation structure to install the reactor in the accommodating cavity of the housing, which can reduce the installation difficulty of the reactor and avoid damaging the structure of the housing, so as to ensure the overall structural strength of the frequency converter and make the appearance of the frequency converter more beautiful. In this embodiment, the reactor is installed on the mounting base, and the supporting assembly is for the mounting base to slide. The mounting base can slide into the accommodating cavity along the first direction of the housing through the opening, so as to place the reactor installed on the mounting base in the accommodating cavity of the housing. When assembling the frequency converter, first install the reactor on the mounting base, and then push the mounting base to make the mounting base slide into the accommodating cavity of the housing along the first direction of the housing, and the reactor can be placed in the accommodating cavity of the housing. Through the drawer-type installation structure, the mounting base for installing the reactor can slide into the accommodating cavity along the first direction of the housing, which can reduce the installation difficulty of the reactor; at the same time, it does not need to open holes at the top or bottom of the housing, which can ensure the overall structural strength of the housing, and then ensure the overall structural strength of the frequency converter, and can also make the appearance of the frequency converter more beautiful. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 It is a schematic structural diagram of the frequency converter in Embodiment 1 provided by the present utility model;

[0021] Figure 2Schematic connection diagram of the fixing member, support assembly, and housing (partial) in Embodiment 1 provided by the present utility model;

[0022] Figure 3 Schematic connection diagram of the fixing member, support assembly, locking member, and housing (partial) in Embodiment 1 provided by the present utility model;

[0023] Figure 4 Schematic connection diagram of the fixing member, support assembly, and housing (partial) in Embodiment 2 provided by the present utility model.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Housing; 11. Accommodation cavity; 111. Limit block; 12. Opening; 2. Mounting base; 21. Locking member; 3. Support assembly; 31. Support block; 311. Sliding surface; 4. Fixing member.

[0026] The realization of the purpose, functional characteristics, and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes Solution A, Solution B, or a solution that satisfies both A and B simultaneously.

[0030] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] In a frequency converter, a reactor has functions such as suppressing harmonics, protecting the frequency converter and the motor, filtering, and limiting voltage fluctuations. When assembling the frequency converter, it is usually necessary to open through holes at the top or bottom of the housing, and then install the reactor into the housing from above or below the housing through the through holes; when installing the reactor from above the housing, the worker needs to keep holding the reactor and tighten the bolts for fixing the reactor; when installing the reactor from below the housing, the worker needs to keep holding up the reactor and tighten the bolts for fixing the reactor. By installing the reactor in the above two ways, the installation difficulty of the reactor is relatively high.

[0032] The present utility model provides a frequency converter, aiming to solve the technical problem of the high installation difficulty of the reactor of the frequency converter.

[0033] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the frequency converter includes a housing 1, a mounting base 2, and a support assembly 3. The housing 1 forms a receiving cavity 11 and an opening 12 communicating with the receiving cavity 11. The mounting base 2 is provided with a reactor, and the mounting base 2 can slide into the receiving cavity 11 along a first direction of the housing 1 through the opening 12. The support assembly 3 is disposed at the opening 12, and the support assembly 3 is provided with a sliding surface 311 for the mounting base 2 to slide. Among them, the first direction refers to the direction indicated by X in Figure 1 , and in a specific embodiment, the first direction refers to the length direction of the housing 1.

[0034] The technical solution of the present utility model adopts a drawer-type installation structure to install the reactor in the accommodation cavity 11 of the housing 1, which can reduce the installation difficulty of the reactor and avoid damaging the structure of the housing 1, so as to ensure the overall structural strength of the frequency converter and make the appearance of the frequency converter more beautiful. In this embodiment, the reactor is installed on the mounting base 2, and the support assembly 3 allows the mounting base 2 to slide. The mounting base 2 can slide into the accommodation cavity 11 along the first direction of the housing 1 through the opening 12, so as to place the reactor mounted on the mounting base 2 in the accommodation cavity 11 of the housing 1. When assembling the frequency converter, first install the reactor on the mounting base 2, and then push the mounting base 2 so that the mounting base 2 slides into the accommodation cavity 11 of the housing 1 along the first direction of the housing 1, and the reactor can be placed in the accommodation cavity 11 of the housing 1. Through the drawer-type installation structure, the mounting base 2 for installing the reactor slides into the accommodation cavity 11 along the first direction of the housing 1, which can reduce the installation difficulty of the reactor; at the same time, it does not need to open holes at the top or bottom of the housing 1, which can ensure the overall structural strength of the housing 1, and then ensure the overall structural strength of the frequency converter, and can also make the appearance of the frequency converter more beautiful.

[0035] It should be noted that the housing 1 in this embodiment is formed by enclosing plates. And when assembling the frequency converter, first connect the plates at the top, bottom and both sides of the housing 1, then place the reactor mounted on the mounting base 2 into the accommodation cavity 11 through the opening 12 of the housing 1, and fix the mounting base 2. Finally, install the plates at both ends of the housing 1; that is to say, when placing the reactor into the housing 1, there is no need to open through holes in the plates at the top or bottom of the housing 1. Only by using the opening 12 formed during the assembly process of the housing 1, the reactor can be installed into the housing 1 by sliding, which can reduce the installation difficulty of the reactor. At the same time, this frequency converter also does not need to open through holes in the plates for assembling the housing 1, which can ensure the structural strength of the plates and then ensure the overall structural strength of the housing 1.

[0036] Please refer to Figure 2 and Figure 3 In an embodiment of the present utility model, the support assembly 3 includes a plurality of support blocks 31 spaced along the second direction of the housing 1, and each support block 31 is provided with a sliding surface 311. Among them, the second direction refers to Figure 1The direction indicated by Y therein. In a specific embodiment, the second direction refers to the width direction of the housing 1. In this embodiment, each support block 31 is used to support the mounting seat 2, and the sliding surface 311 of each support block 31 is provided for the mounting seat 2 to slide, so as to ensure that the mounting seat 2 can slide into the accommodation cavity 11 through the opening 12. In a specific embodiment, the number of support blocks 31 is two, and the distance between the two support blocks 31 is greater than half of the distance of the mounting seat 2 along the second direction of the housing 1, and the distance between the two support blocks 31 is less than the distance of the mounting seat 2 along the second direction of the housing 1. Specifically, the distance between the two support blocks 31 is slightly less than the width of the mounting seat 2, which can ensure the stability of the mounting seat 2 when sliding on the two support blocks 31. It should be noted that the support block 31 has a certain thickness, which can raise the height of the mounting seat 2 to prevent the mounting seat 2 from bumping against the bottom surface of the accommodation cavity 11 when sliding into the accommodation cavity 11 through the opening 12. In a specific embodiment, to reduce the frictional resistance when the mounting seat 2 slides, the sliding surface 311 can be designed as a convex surface and a lubricant can be coated on the sliding surface 311. In addition, the number of the support assemblies 3 can also be multiple, and the multiple support assemblies 3 are arranged at intervals along the first direction of the housing.

[0037] Please refer to Figure 4 In another embodiment of the present utility model, the support assembly 3 includes a support block 31 extending along the second direction of the housing 1, and the support block is provided with a sliding surface 311. In this embodiment, the support block 31 is used to support the mounting seat 2, and the sliding surface 311 of the support block 31 is provided for the mounting seat 2 to slide, so as to ensure that the mounting seat 2 can slide into the accommodation cavity 11 through the opening 12. In this embodiment, the length of the support block 31 is greater than half of the distance of the mounting seat 2 along the second direction of the housing 1 and less than the distance of the mounting seat 2 along the second direction of the housing 1. In a specific embodiment, the length of the support block 31 is slightly less than the distance of the mounting seat 2 along the second direction of the housing 1, which can ensure the stability of the mounting seat 2 when sliding on the support block. It should be noted that in this embodiment, the support block 31 has the same function as the support block 31 in the first embodiment above, that is, to prevent the mounting seat 2 from bumping against the bottom surface of the accommodation cavity 11 when sliding into the accommodation cavity 11 through the opening 12. And, to reduce the frictional resistance when the mounting seat 2 slides, the sliding surface 311 can be designed as a convex surface and a lubricant can be coated on the sliding surface 311.

[0038] In another embodiment of the present utility model, the support assembly 3 includes a plurality of pulleys spaced along the second direction of the housing 1, and each pulley is rotatably disposed on the housing 1. The sliding surface includes the outer circumferential surfaces of the pulleys. In this embodiment, each pulley is used to support the mounting seat 2, and the outer circumferential surface of each pulley is for the mounting seat 2 to slide, so as to ensure that the mounting seat 2 can slide into the accommodation cavity 11 through the opening 12; and by using rolling friction instead of sliding friction, the frictional resistance during the sliding of the mounting seat 2 can be reduced. In addition, this slider also has the same function as the support block 31 mentioned in the foregoing part, that is, it can prevent the mounting seat 2 from bumping against the housing 1. And since the sliding surface is the outer circumferential surface of the pulley, that is, the sliding surface is a convex surface, in order to further reduce the frictional resistance during the sliding of the mounting seat 2, a lubricant can be coated on the outer circumferential surface of the pulley (i.e., the sliding surface).

[0039] Further, in the above embodiments, in order to ensure the stable position of the mounting seat 2 during sliding, one of a convex block and a groove can be provided on the mounting seat 2, and the other of the convex block and the groove can be provided on the sliding surface 311, so as to prevent the mounting seat 2 from wobbling when sliding along the first direction of the housing 1. In a specific embodiment, the connection between the mounting seat 2 and the support assembly 3 can also be realized by the cooperation of a gear and a rack.

[0040] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the frequency converter further includes a limiting block 111 disposed in the accommodation cavity 11. The limiting block 111 can abut against one side of the mounting seat 2 along the first direction to limit the sliding-in position of the mounting seat 2. In this embodiment, the limiting block 111 can form a guiding space surrounded by the bottom plate and the side plate of the housing 1; after the mounting seat 2 slides into the accommodation cavity 11 through the opening 12, the mounting seat 2 will slide into the guiding space and gradually slide to a preset position along the guiding space. By providing the limiting block 111 in the accommodation cavity 11 that can abut against one side of the mounting seat 2 along the first direction, the position of the mounting seat 2 can be limited to ensure the accuracy of the installation position of the mounting seat 2. It should be noted that when the mounting seat 2 slides in the guiding space, the mounting seat 2 can either abut against the limiting block 111 or not abut against the limiting block 111.

[0041] In an embodiment of the present utility model, the number of the limiting blocks 111 is two. The two limiting blocks 111 are arranged at intervals, and the two limiting blocks 111 can respectively abut against both sides of the mounting base 2 along the second direction to limit the sliding-in position of the mounting base 2. In this embodiment, the two limiting blocks 111 can enclose a guiding space with the plates at the bottom of the housing 1. After the mounting base 2 slides into the receiving cavity 11 through the opening 12, the mounting base 2 will slide into the guiding space and gradually slide to the preset position along the guiding space. By arranging the two limiting blocks 111 in the receiving cavity 11 that can respectively abut against both sides of the mounting base 2 along the first direction, the position of the mounting base 2 can be limited to ensure the accuracy of the mounting position of the mounting base 2. In a specific embodiment, the two limiting blocks 111 are symmetrically arranged. By symmetrically arranging the two limiting blocks 111, the mounting base 2 can be limited to the middle position at the bottom of the housing 1 to ensure the uniform mass distribution of the frequency converter.

[0042] Please refer to Figure 2 , in an embodiment of the present utility model, the frequency converter further includes a fixing member 4 arranged in the receiving cavity 11, and the fixing member 4 can be connected to the mounting base 2. In this embodiment, the fixing member 4 can be connected to the mounting base 2 after the mounting base 2 slides to the preset position to fix the position of the mounting base 2, and further fix the position of the reactor to ensure the stability of the mounting position of the reactor. Specifically, after the mounting base 2 with the reactor installed slides to the preset position, it can be connected to the fixing member 4 to fix its position. In a specific embodiment, the mounting base 2 is connected to the fixing member 4 by bolts. Connecting the mounting base 2 and the fixing member 4 together by bolts can reduce the difficulty of fixing the mounting base 2; moreover, during subsequent maintenance and repair, it is also convenient for workers to disassemble the mounting base 2 and the fixing member 4, thereby reducing the difficulty of maintenance and repair. In addition, the connection between the mounting base 2 and the fixing member 4 can also be achieved by riveting, welding and other methods. It should be noted that the fixing member 4 here can be a block structure, a plate structure, or a plurality of fixing blocks or fixing plates arranged at intervals along the second direction, as long as it can ensure that the fixing member 4 can be connected to the mounting base 2 after the mounting base 2 slides to the preset position to fix the position of the mounting base 2.

[0043] Please refer to Figure 2, in an embodiment of the present utility model, both ends of the fixing member 4 are respectively connected to one ends of the two limiting blocks 111 away from the opening 12. In this embodiment, the fixing member 4 is a long strip-shaped block or a long strip-shaped plate. Both ends of the fixing member 4 are respectively connected to one ends of the two limiting blocks 111 away from the opening 12. That is to say, when the fixing member 4 is installed into the accommodating cavity 11, both of its ends are respectively connected to the two limiting blocks 111, which can make the installation of the fixing member 4 more secure. In a specific embodiment, both ends of the fixing member 4 are connected to the limiting blocks 111 by bolts. In addition, the connection between the fixing member 4 and the limiting blocks 111 can also be achieved by riveting, welding and other methods.

[0044] Please refer to Figure 3 , in an embodiment of the present utility model, the mounting seat 2 is provided with a locking member 21. Both ends of the locking member 21 can be respectively connected to one ends of the two limiting blocks 111 close to the opening 12. In this embodiment, when the mounting seat 2 slides into the accommodating cavity 11, the locking member 21 will slide together with the mounting seat 2. After the mounting seat 2 slides to a preset position, both ends of the locking member 21 are respectively connected to one ends of the two limiting blocks 111 close to the opening 12. Cooperating with the fixing member 4, it can lock the mounting seat 2 in the first direction of the housing 1 to ensure the accuracy of the installation position of the mounting seat 2, and further ensure the accuracy of the installation position of the reactor mounted on the mounting seat 2. In a specific embodiment, both ends of the locking member 21 are connected to the limiting blocks 111 by bolts. In addition, the connection between the locking member 21 and the limiting blocks 111 can also be achieved by riveting, welding and other methods.

[0045] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A frequency converter, characterized in that, Comprising: A housing, an accommodation cavity is formed in the housing and an opening communicating with the accommodation cavity; A mounting base, a reactor is provided on the mounting base, and the mounting base can slide into the accommodation cavity along a first direction of the housing through the opening; A support assembly, the support assembly is arranged at the opening, and the support assembly is provided with a sliding surface for the mounting base to slide.

2. The frequency converter according to claim 1, characterized in that, The support assembly includes a plurality of support blocks arranged at intervals along a second direction of the housing, and each of the support blocks is provided with the sliding surface.

3. The frequency converter according to claim 1, wherein, The support assembly includes a support block extending along a second direction of the housing, and the support block is provided with the sliding surface.

4. The frequency converter according to claim 1, characterized in that, The support assembly includes a plurality of pulleys arranged at intervals along a second direction of the housing, each of the pulleys is rotatably arranged on the housing, and the sliding surface includes the outer circumferential surfaces of the pulleys.

5. The frequency converter according to claim 1, characterized in that, The frequency converter further includes a limiting block arranged in the accommodation cavity, and the limiting block can abut against one side of the mounting base along the second direction to limit the sliding-in position of the mounting base.

6. The frequency converter according to claim 5, characterized in that, The number of the limiting blocks is two, the two limiting blocks are arranged at intervals, and the two limiting blocks can respectively abut against both sides of the mounting base along the second direction to limit the sliding-in position of the mounting base.

7. The frequency converter according to claim 6, characterized in that, The frequency converter further includes a fixing member arranged in the accommodation cavity, and the fixing member can be connected to the mounting base.

8. The frequency converter according to claim 7, characterized in that, Two ends of the fixing member are respectively connected to one ends of the two limiting blocks away from the opening.

9. The frequency converter according to claim 6, characterized in that, The mounting base is provided with a locking member, and two ends of the locking member can be respectively connected to one ends of the two limiting blocks close to the opening.

10. The frequency converter according to any one of claims 1 to 9, characterized in that, The sliding surface is a convex surface.

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