An air compressor control circuit convenient for industrial frequency conversion transformation

Abstract

The utility model discloses an air compressor control circuit which is convenient for industrial frequency conversion transformation, comprising a frequency converter, a star-delta conversion circuit, an air compressor main motor, an air compressor fan circuit and an air compressor control circuit; the input end of the frequency converter is connected to an external power supply; the star-delta conversion circuit is connected between the output end of the frequency converter and the air compressor main motor; the air compressor fan circuit and the air compressor control circuit are connected to the external power supply; through the above structure, it is possible to avoid changing too many circuits, especially motor lines, and it is unnecessary to remove and extend the wiring like the traditional method, and the original circuit of the air compressor is retained to the maximum extent, which greatly reduces the failure rate in later use, and also greatly reduces the transformation difficulty and transformation cost of on-site industrial frequency transformation and frequency conversion, saves the time of transformation, and allows customers to resume the use of the machine in a short period of time and quickly resume production.

Description

Technical Field

[0001] The utility model relates to the field of air compressors, in particular to an air compressor control circuit which is convenient for industrial frequency conversion transformation. Background Art

[0002] An air compressor is a device used to compress gas, and its structure is similar to that of a water pump. It is mainly a device that converts mechanical energy into gas pressure energy. Air compressors are widely used and are required in household appliances, installation and maintenance equipment, and even production line preparation machinery. However, due to power supply conditions, it is sometimes necessary to install a frequency conversion cabinet between the air compressor and the power supply, so that a frequency converter is connected between the air compressor and the power supply to realize the industrial frequency conversion transformation of the air compressor, which can reduce the impact on the power grid, reduce the impact on the compressor, and save electricity.

[0003] Reference Figure 1 In the existing industrial frequency conversion transformation technology, the motor line originally connected to the star-delta conversion circuit of the control cabinet needs to be removed during the transformation, and it needs to be pulled out and led to the inverter output terminals U, V, and W of the external frequency conversion cabinet. Affected by the placement of the external frequency conversion cabinet, the original motor line may not be long enough and needs to be extended. When the external frequency conversion cabinet is far away from the air compressor, this method is costly, the implementation process is cumbersome and difficult, and the transformation is delayed for a long time, affecting the recovery of production; at the same time, the extended motor line needs to be re-crimped, and if it is not handled properly, there will be heating problems; in addition, if the motor line is too long, it will be easily interfered by the external circuit and magnetic field, affecting the stability of the air compressor, increasing the failure rate in later use, and increasing the later maintenance cost.

[0004] Therefore, there is an urgent need for an air compressor control circuit that is convenient for industrial frequency conversion transformation to solve the above problems. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an air compressor control circuit that is convenient for industrial frequency conversion transformation.

[0006] The technical solution adopted by an embodiment of the utility model to solve the technical problem is: an air compressor control circuit that is convenient for industrial frequency conversion transformation, including a frequency converter, a star-delta conversion circuit, an air compressor main motor, an air compressor fan circuit and an air compressor control circuit;

[0007] The input end of the inverter is connected to an external power supply;

[0008] The star-delta conversion circuit is connected between the output terminal of the inverter and the main motor of the air compressor;

[0009] The air compressor fan circuit and the air compressor control circuit are connected to an external power supply.

[0010] As one of the preferred embodiments of the utility model, an air compressor control circuit that is convenient for industrial frequency conversion transformation also includes a transformer T1 connected between an external power supply and an air compressor control circuit.

[0011] As one of the preferred embodiments of the present utility model, a fuse is provided between the transformer T1 and the external power supply.

[0012] As one of the preferred embodiments of the utility model, an air compressor control circuit that is convenient for industrial frequency conversion transformation also includes a display screen connected to an external power supply and an air compressor control circuit.

[0013] The beneficial effects of the utility model include: an air compressor control circuit that is convenient for industrial frequency conversion transformation, including a frequency converter, a star-delta conversion circuit, an air compressor main motor, an air compressor fan circuit and an air compressor control circuit; the input end of the frequency converter is connected to an external power supply; the star-delta conversion circuit is connected between the output end of the frequency converter and the air compressor main motor; the air compressor fan circuit and the air compressor control circuit are connected to an external power supply; the above structure can eliminate the need to change too many lines, especially the motor lines, and eliminates the need to dismantle and extend the wiring as in traditional methods, thereby retaining the original lines of the air compressor to the greatest extent, greatly reducing the failure rate in later use, and also greatly reducing the difficulty and cost of on-site industrial frequency conversion and frequency conversion, saving the time for transformation, allowing customers to resume the use of the machine in a short period of time and quickly resume production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 This is the principle block diagram of the existing air compressor control circuit;

[0016] Figure 2 This is a principle block diagram of an air compressor control circuit that is convenient for industrial frequency conversion transformation;

[0017] Figure 3 The present invention is a circuit schematic diagram of an air compressor control circuit which is convenient for industrial frequency conversion transformation. DETAILED DESCRIPTION

[0018] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0019] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0022] Reference Figures 2 to 3 , an air compressor control circuit convenient for industrial frequency conversion transformation, including a frequency converter 10, a star-delta conversion circuit 20, an air compressor main motor 30, an air compressor fan circuit 40 and an air compressor control circuit 50;

[0023] The input end of the frequency converter 10 is connected to an external power supply;

[0024] The star-delta conversion circuit 20 is connected between the output end of the frequency converter 10 and the main motor 30 of the air compressor;

[0025] The air compressor fan circuit 40 and the air compressor control circuit 50 are connected to an external power supply.

[0026] In the present invention, the original motor line connection method of the air compressor main motor 30 connected to the star-delta conversion circuit 20 in the control cabinet can be retained unchanged, the output U, V, W terminals of the frequency converter 10 in the external frequency conversion cabinet are directly connected to the power input terminals R, S, T of the air compressor control cabinet, and the power lines of the air compressor fan circuit 40 and the air compressor control circuit 50 are removed and separately connected to the user's 380V power supply, so as to achieve the purpose of distinguishing the power supply of the air compressor main motor 30 from the air compressor fan circuit 40 and the air compressor control circuit 50; the advantages of the present invention are: there is no need to change too many lines, especially motor lines, and there is no need to remove and extend the wiring like the traditional method, and the original lines of the air compressor are retained to the maximum extent, which greatly reduces the failure rate in later use, and also greatly reduces the difficulty and cost of on-site power frequency conversion and frequency conversion, saving the time of transformation, allowing customers to resume the use of the machine in a short time and quickly resume production

[0027] In one embodiment, an air compressor control circuit that is easy to modify for industrial frequency conversion also includes a transformer T1 connected between an external power supply and an air compressor control circuit 50; further, the normally open auxiliary contacts of the KM1 angle contactor are used as start and stop signals of the external frequency conversion cabinet. When the air compressor is started, the KM2 main contactor and the KM1 angle contactor are energized, the frequency converter 10 is started, the air compressor main motor 30 is operated, and automatic loading and unloading operations are performed according to the program logic of the air compressor controller.

[0028] In one embodiment, a fuse 60 is provided between the transformer T1 and the external power source.

[0029] In one embodiment, an air compressor control circuit that is convenient for industrial frequency conversion modification further includes a display screen 70 connected to an external power supply and the air compressor control circuit 50 .

[0030] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An air compressor control circuit that is convenient for industrial frequency conversion transformation, characterized in that: It comprises a frequency converter (10), a star-delta conversion circuit (20), an air compressor main motor (30), an air compressor fan circuit (40) and an air compressor control circuit (50); The input end of the frequency converter (10) is connected to an external power supply; The star-delta conversion circuit (20) is connected between the output end of the frequency converter (10) and the main motor (30) of the air compressor; The air compressor fan circuit (40) and the air compressor control circuit (50) are connected to an external power supply.

2. The air compressor control circuit that is convenient for industrial frequency conversion transformation according to claim 1 is characterized in that: It also includes a transformer T1 connected between an external power source and the air compressor control circuit (50).

3. The air compressor control circuit that is convenient for industrial frequency conversion transformation according to claim 2 is characterized in that: A fuse (60) is provided between the transformer T1 and the external power supply.

4. The air compressor control circuit that is convenient for industrial frequency conversion transformation according to claim 1 is characterized in that: It also includes a display screen (70) connected to an external power source and the air compressor control circuit (50).

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