A low-temperature-resistant testing device for frequency converter

Abstract

This utility model discloses a low-temperature resistance testing device for frequency converters, belonging to the field of frequency converter manufacturing. It includes a housing with a cover inserted into the top. Several branch pipes pass through the cover, and a common air supply pipe is fixed to the top of each branch pipe. The bottom end of each branch pipe extends into the housing and is rotatably connected to a mounting base. Several nozzles are fixedly connected to the outer wall of the mounting base, and a power assembly is installed inside the mounting base. An auxiliary assembly that cooperates with the mounting base is also provided on the cover. The beneficial effects are: the mounting base is rotatably connected to one end of the branch pipe extending into the housing, and nozzles are fixedly connected around the mounting base. The impact force of the airflow drives the mounting base to rotate the nozzles, improving the uniformity of cold air coverage through dynamic rotational air supply, making the temperature more uniform in different areas of the housing; the auxiliary assembly intermittently accelerates the rotation of the mounting base and nozzles, generating pulsating airflow, thereby improving the mixing efficiency of cold air and air inside the housing, and increasing the cooling efficiency inside the housing.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter manufacturing, and in particular to a low-temperature resistance testing device for frequency converters. Background Technology

[0002] A frequency converter (VFD) is a power control device that uses frequency conversion technology and microelectronics to control an AC motor by changing the frequency of its power supply. A VFD mainly consists of a rectification, filtering, inversion, braking unit, drive unit, detection unit, and microprocessor unit. The VFD adjusts the output voltage and frequency by switching its internal IGBTs, providing the required power voltage according to the motor's actual needs, thereby achieving energy saving and speed regulation. Low-temperature resistance testing of VFDs is to evaluate their performance and reliability in low-temperature environments. In extremely cold regions or applications requiring operation in low-temperature environments, VFDs need to operate normally and maintain stable performance. Low-temperature resistance testing verifies the VFD's operating status under low-temperature conditions to ensure it meets design requirements and can reliably cope with cold environments.

[0003] A search of Chinese Patent Publication No. CN222087741U reveals a low-temperature resistance testing device for a frequency converter, comprising a housing, a sealing gasket on the top of the housing, a housing cover fixedly connected to the top of the sealing gasket, an air inlet fixedly connected inside the housing cover, a thermometer fixedly connected inside the housing cover and to the right of the air inlet, a pressure relief valve fixedly connected inside the left end of the housing, a mounting base fixedly connected inside the housing, a frequency converter slidably connected inside the mounting base, a cable mounted on the frequency converter, and a positioning mechanism mounted on the frequency converter. Cold air is introduced into the housing through the air inlet. Once the frequency converter has cooled down, it can be connected to a testing device via the cable for testing.

[0004] Most existing technologies deliver cold air into the device through a single air duct. However, a single air duct can lead to uneven distribution of cold air, resulting in localized low or high temperatures within the chamber, which in turn distorts the test results. Utility Model Content

[0005] The purpose of this invention is to provide a low-temperature resistance testing device for frequency converters in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A low-temperature resistance testing device for frequency converters includes a housing with a pressure relief valve on one side and a cover inserted into the top of the housing. A thermometer is installed on the cover. Several branch pipes pass through the cover, and the top of each branch pipe is fixedly connected to a common air supply pipe. A frequency converter is placed inside the housing, and cables are fixedly connected to the frequency converter. The bottom end of each branch pipe extends into the housing and is rotatably connected to a mounting base. The mounting base has an internal mounting cavity communicating with the branch pipes. Several circumferentially arranged nozzles are fixedly connected to the outer wall of the mounting base, and the nozzles communicate with the interior of the mounting base. A power component is installed inside the mounting base to drive the mounting base to rotate. An auxiliary component that cooperates with the mounting base is also provided on the cover to intermittently increase the rotation speed of the mounting base.

[0008] Preferably, the power assembly includes a mounting shaft fixedly connected to the bottom wall of the mounting base, and a plurality of fan blades are fixedly connected to the mounting shaft.

[0009] Preferably, the auxiliary component includes a mounting ring, which is fixedly connected to the top of the cover via a connecting post. Several circumferentially arranged wedge-shaped blocks are fixedly connected to the inner wall of the mounting ring, and the mounting seat is located inside the mounting ring.

[0010] Preferably, a placement plate is fixedly connected between the inner walls of the enclosure. The placement plate is mesh-like, and the frequency converter is placed on the placement plate.

[0011] Preferably, the bottom of the cover is fixedly connected to an insert block, and the top of the box has an insertion hole that mates with the insert block.

[0012] Preferably, handles are fixedly connected to both sides of the cover.

[0013] Preferably, the bottom of the cover has an upper slot and the top of the box has a lower slot. The upper slot and the lower slot are joined together to form a circular limiting groove. The cable is inserted into the limiting groove and a sealing gasket is fixedly connected inside the limiting groove.

[0014] The beneficial effects are as follows: one end of the branch pipe extending into the cabinet is rotatably connected to the mounting base, and nozzles are fixedly connected around the mounting base. The impact force of the airflow drives the mounting base to rotate the nozzles, and the dynamic rotational air supply improves the uniformity of cold air coverage, making the temperature of different areas in the cabinet more uniform. Through the setting of auxiliary components, the rotation of the mounting base and nozzles is intermittently accelerated, which generates pulsating airflow, thereby improving the mixing efficiency of cold air and air in the cabinet and improving the cooling efficiency of the cabinet.

[0015] The additional technical features and advantages of this utility model will become more apparent from the following description, or may be learned through specific practice of this utility model. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the first overall structure of the inverter low-temperature resistance testing device described in this utility model;

[0018] Figure 2 This is a schematic diagram of the second overall structure of the inverter low-temperature resistance testing device described in this utility model;

[0019] Figure 3 This is a schematic diagram of the cover of the inverter low-temperature resistance testing device described in this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the housing of the inverter low-temperature resistance testing device described in this utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the mounting base of the frequency converter low-temperature resistance testing device described in this utility model.

[0022] The reference numerals in the attached drawings are explained as follows: 1. Housing; 101. Placement plate; 102. Pressure relief valve; 2. Cover; 201. Handle; 202. Insert block; 301. Air supply pipe; 302. Branch pipe; 401. Mounting base; 402. Nozzle; 403. Mounting shaft; 404. Fan blade; 405. Mounting ring; 406. Wedge block; 5. Frequency converter; 501. Cable; 6. Thermometer; 7. Sealing gasket. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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 this utility model.

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figures 1-5As shown, a low-temperature resistance testing device for frequency converters includes a housing 1. A pressure relief valve 102 is provided on one side of the housing 1. A cover 2 is inserted into the top of the housing 1. Handles 201 are fixedly connected to both sides of the cover 2. An insert block 202 is fixedly connected to the bottom of the cover 2. An insertion hole that mates with the insert block 202 is opened on the top of the housing 1. A thermometer 6 is installed on the cover 2. The test head of the thermometer 6 extends into the housing 1 to detect the temperature inside the housing 1. A frequency converter 5 is placed inside the housing 1. A cable 501 is fixedly connected to the frequency converter 5. An upper slot is opened at the bottom of the cover 2. A lower slot is opened at the top of the housing 1. The upper slot and the lower slot are joined to form a circular limiting groove. The cable 501 is locked in the limiting groove. A sealing gasket 7 is fixedly connected in the limiting groove.

[0027] A placement plate 101 is fixedly connected between the inner walls of the enclosure 1. The placement plate 101 is a mesh plate. The frequency converter 5 is placed on the placement plate 101, so that cold air can pass through the placement plate 101 and around the bottom of the frequency converter 5, thereby improving the effect of the low temperature resistance test.

[0028] Several branch pipes 302 pass through the cover 2. The top of the branch pipes 302 is fixedly connected to the same air supply pipe 301. The bottom end of the branch pipes 302 extends into the box 1 and is rotatably connected to the mounting base 401. The mounting base 401 has a mounting cavity that communicates with the branch pipes 302. Several circumferentially arranged nozzles 402 are fixedly connected to the outer wall of the mounting base 401. The nozzles 402 communicate with the interior of the mounting base 401.

[0029] The mounting base 401 is provided with a power assembly for driving the mounting base 401 to rotate. The power assembly includes a mounting shaft 403 fixedly connected to the bottom wall of the mounting base 401, and several fan blades 404 are fixedly connected to the mounting shaft 403.

[0030] The cover 2 is also provided with an auxiliary component that cooperates with the mounting base 401. The auxiliary component is used to intermittently increase the rotation speed of the mounting base 401. The auxiliary component includes a mounting ring 405, which is fixedly connected to the top of the cover 2 by a connecting post. Several circumferentially arranged wedge blocks 406 are fixedly connected to the inner wall of the mounting ring 405. The mounting base 401 is located inside the mounting ring 405. When the airflow ejected from the nozzle 402 hits the inner wall of the mounting ring 405, part of the airflow flows along the inner wall of the mounting ring 405. When the airflow ejected from the nozzle 402 hits the wedge blocks 406, the guiding ability of the wedge blocks 406 to the airflow is not as good as the guiding ability of the arc-shaped inner wall of the mounting ring 405. Therefore, the nozzle 402 is subjected to a greater recoil force, thereby increasing the rotation speed of the nozzle 402.

[0031] Working principle: In use, place the frequency converter 5 on the placement plate 101, insert the cable 501 into the lower slot at the top of the housing 1, insert the plug 202 at the bottom of the cover 2 into the socket at the top of the housing 1, and simultaneously secure the cable 501 through the upper slot at the bottom of the cover 2. Cold air is supplied to the branch pipe 302 through the air supply pipe 301. The impact of the cold air on the fan blades 404 drives the fan blades 404 to rotate the mounting shaft 403, which in turn drives the mounting base 401 to rotate. The mounting base 401 then drives the nozzle 402 to rotate, thus achieving dynamic rotational air delivery. The uniformity of the cooling air coverage makes the temperature in different areas of the enclosure 1 more uniform. When the airflow ejected from the nozzle 402 impacts the wedge block 406, it increases the recoil force on the nozzle 402 and the mounting base 401, thereby intermittently accelerating the rotation of the mounting base 401 and the nozzle 402, generating a pulsating airflow, thereby improving the mixing efficiency of the cooling air and the air inside the enclosure 1, and improving the cooling efficiency inside the enclosure 1. The temperature inside the enclosure 1 is detected by the temperature gauge 6. When the temperature inside the enclosure 1 reaches a certain value, the cable 501 is connected to other equipment to observe the operation of the frequency converter 5 under low temperature conditions.

[0032] 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 claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-temperature resistance testing device for a frequency converter, comprising a housing (1), a pressure relief valve (102) provided on one side of the housing (1), a cover (2) inserted into the top of the housing (1), a thermometer (6) installed on the cover (2), a plurality of branch pipes (302) passing through the cover (2), the top of the branch pipes (302) being fixedly connected to the same air supply pipe (301), a frequency converter (5) placed inside the housing (1), and a cable (501) fixedly connected to the frequency converter (5), characterized in that: The bottom end of the branch pipe (302) extends into the housing (1) and is rotatably connected to the mounting base (401). The mounting base (401) has an installation cavity that communicates with the branch pipe (302). Several circumferentially arranged nozzles (402) are fixedly connected to the outer wall of the mounting base (401). The nozzles (402) communicate with the interior of the mounting base (401). A power component is provided inside the mounting base (401). The power component is used to drive the mounting base (401) to rotate. An auxiliary component that cooperates with the mounting base (401) is also provided on the cover (2). The auxiliary component is used to intermittently increase the rotation speed of the mounting base (401).

2. The inverter low-temperature resistance testing device according to claim 1, characterized in that: The power assembly includes a mounting shaft (403) fixedly connected to the bottom wall of the mounting base (401), and a plurality of fan blades (404) are fixedly connected to the mounting shaft (403).

3. The inverter low-temperature resistance testing device according to claim 1, characterized in that: The auxiliary component includes a mounting ring (405), which is fixedly connected to the top of the cover (2) by a connecting post. A plurality of circumferentially arranged wedge blocks (406) are fixedly connected to the inner wall of the mounting ring (405), and the mounting seat (401) is located inside the mounting ring (405).

4. The inverter low-temperature resistance testing device according to claim 1, characterized in that: A placement plate (101) is fixedly connected between the inner walls of the housing (1). The placement plate (101) is in the shape of a mesh plate, and the frequency converter (5) is placed on the placement plate (101).

5. The inverter low-temperature resistance testing device according to claim 1, characterized in that: The bottom of the cover (2) is fixedly connected to a plug (202), and the top of the box (1) is provided with a plug hole that cooperates with the plug (202).

6. The inverter low-temperature resistance testing device according to claim 1, characterized in that: Handles (201) are fixedly connected to both sides of the cover (2).

7. The inverter low-temperature resistance testing device according to claim 1, characterized in that: The bottom of the cover (2) is provided with an upper slot, and the top of the box (1) is provided with a lower slot. The upper slot and the lower slot are joined together to form a circular limiting groove. The cable (501) is inserted into the limiting groove, and a sealing gasket (7) is fixedly connected inside the limiting groove.

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