Submersible pump overcurrent protection device

Abstract

The utility model discloses a submersible pump overcurrent protection device which comprises a pump cover, a nut and an overcurrent protection assembly, a screwed pipe joint is arranged on one side of the pump cover, the nut is arranged on the screwed pipe joint, the overcurrent protection assembly comprises an overcurrent protector and a protector shell, the overcurrent protector is arranged in the protector shell, and the protector shell is connected with the nut. The protector shell is arranged in an inner hole of the threaded pipe joint, the overcurrent protector is provided with a wire connecting column which penetrates through the protector shell and extends into the pump cover through the inner hole of the threaded pipe joint, and the outer end of the protector shell is provided with a limiting piece located on the end face of the threaded pipe joint. The inner side of the nut is provided with a heat-conducting piece making contact with the limiting piece, and the heat-conducting piece is provided with cooling fins extending to the outer side of the nut. According to the overcurrent protection device for the submersible pump, overcurrent protection can be carried out on the submersible pump, cooling of the overcurrent protector is accelerated, and the reset time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of over-current protection of submersible pumps, in particular to an over-current protection device for submersible pumps. Background Art

[0002] A submersible pump needs to be immersed in water for operation. Therefore, the shell of the submersible pump usually has good sealing performance, which can prevent water flow from entering the interior of its motor and ensure the long-term underwater operation of the motor.

[0003] During the operation of the submersible pump, blocking or overload may occur, resulting in a sharp increase in the current passing through the motor. To avoid burning out the motor, an over-current protector can be installed to disconnect the power supply line of the motor when the current is too large for motor protection.

[0004] In order to automatically resume the operation of the submersible pump, an over-current protector that automatically resets after cooling can be used. However, due to the good sealing performance of the submersible pump shell, the cooling speed of the over-current protector in the submersible pump shell is slow, greatly prolonging the cooling and resetting time. It often takes several minutes to reset, affecting the normal use of the submersible pump after troubleshooting, and improvement is needed. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an over-current protection device for submersible pumps to protect against over-current of the submersible pump and achieve rapid cooling and reset of the over-current protector.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An over-current protection device for submersible pumps, comprising: a pump cover, a nut and an over-current protection component. One side of the pump cover is provided with a threaded pipe joint, the nut is arranged on the threaded pipe joint, the over-current protection component includes an over-current protector and a protector housing, the over-current protector is arranged in the protector housing, the protector housing is arranged in the inner hole of the threaded pipe joint, the over-current protector is provided with a wire connection column that penetrates the protector housing and extends to the pump cover through the inner hole of the threaded pipe joint, the outer end of the protector housing is provided with a limiting piece located on the end face of the threaded pipe joint, the inner side of the nut is provided with a heat-conducting piece in contact with the limiting piece, and the heat-conducting piece is provided with a heat-dissipating fin extending to the outside of the nut.

[0008] Wherein, a section of external thread corresponding to the nut is arranged on the threaded pipe joint.

[0009] Wherein, the nut is an insulating plastic nut.

[0010] Wherein, the protector housing and the limiting piece adopt an integrated insulating plastic structure.

[0011] Wherein, the heat-conducting piece and the heat-dissipating fin adopt an integrated aluminum alloy structure.

[0012] Wherein, a sealing washer corresponding to the nut is provided on the threaded pipe joint.

[0013] The beneficial effects of the present utility model: A submersible pump overcurrent protection device, the overcurrent protector is connected to the submersible pump motor circuit through a wire connection column, generates heat and automatically opens the circuit during overcurrent, strengthening the protection of the submersible pump motor. By using the heat sink to contact the external water flow, the temperature of the heat conducting sheet can be reduced, and the heat conducting sheet is used to absorb heat from the protector housing, accelerating the cooling of the overcurrent protector and shortening the reset time. The overcurrent protector can be reset within a few seconds after opening the circuit, which is beneficial to improving the working efficiency after troubleshooting the submersible pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of the present utility model;

[0015] Figure 2 is Figure 1 an exploded view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following Figures 1 to 2 and further illustrate the technical solutions of the present utility model through specific embodiments.

[0017] Such as Figure 1 and Figure 2 The submersible pump overcurrent protection device shown includes: a pump cover 1, a nut 3, and an overcurrent protection component 2. A threaded pipe joint 7 is provided on one side of the pump cover 1, and the pump cover 1 and the threaded pipe joint 7 adopt an integrated structure to avoid leakage at the connection.

[0018] The nut 3 is arranged on the threaded pipe joint 7. As Figure 2 shown, an external thread 8 corresponding to the nut 3 is provided on the threaded pipe joint 7, which is convenient for disassembly and assembly and has good sealing performance. In this embodiment, a sealing washer 6 corresponding to the nut 3 is provided on the threaded pipe joint 7, which can further improve the sealing performance after the nut 3 is installed and prevent water flow from entering the threaded pipe joint 7 and the pump cover 1.

[0019] Such as Figure 1 shown, the overcurrent protection component 2 includes an overcurrent protector 21 and a protector housing 23. The overcurrent protector 21 is arranged in the protector housing 23, and the overcurrent protector 21 is protected by the protector housing 23, which is convenient for positioning and assembly.

[0020] The protector housing 23 is arranged in the inner hole of the threaded pipe joint 7. A wire connection post 22 is provided on the overcurrent protector 21, which penetrates through the protector housing 23 and extends into the pump cover 1 through the inner hole of the threaded pipe joint 7. The overcurrent protector 21 is connected to the submersible pump motor circuit through the wire connection post 22. The overcurrent protector 21 can adopt a self - resetting fuse, which generates heat and automatically opens the circuit during overcurrent, strengthening the protection of the submersible pump motor.

[0021] A limiting piece 24 located on the end face of the threaded pipe joint 7 is arranged at the outer end of the protector housing 23 for axial limiting. In this embodiment, the protector housing 23 and the limiting piece 24 adopt an integrated insulating plastic structure, and the overcurrent protector 21 is wrapped in a packaging form, strengthening the protection of the overcurrent protector 21 and improving the position stability after installation.

[0022] In this embodiment, the nut 3 adopts an insulating plastic nut, which has good corrosion resistance and can provide insulation protection, making it safer to use. A heat - conducting piece 4 in contact with the limiting piece 24 is arranged inside the nut 3. A heat - dissipating fin 5 extending to the outside of the front of the nut 3 is arranged on the heat - conducting piece 4. The heat - conducting piece 4 and the heat - dissipating fin 5 adopt an integrated aluminum alloy structure, with good heat - conducting effect. The heat - conducting piece 4 and the heat - dissipating fin 5 are placed in the injection mold of the nut 3, and are fixed through the injection molding of the nut 3, with stable structure and ensuring the sealing performance of the nut 3.

[0023] By using the heat - dissipating fin 5 to contact the external water flow, the temperature of the heat - conducting piece 4 can be reduced. The heat - conducting piece 4 is used to absorb heat from the protector housing 23, accelerating the cooling of the overcurrent protector 21 and shortening the reset time of the overcurrent protector 21. The overcurrent protector 21 can be reset within several seconds after opening the circuit, which is beneficial to improving the working efficiency of the submersible pump after troubleshooting.

[0024] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A submersible pump overcurrent protection device, characterized in that: include: A pump cover, a nut and an overcurrent protection assembly, wherein a threaded pipe joint is arranged on one side of the pump cover, the nut is arranged on the threaded pipe joint, the overcurrent protection assembly includes an overcurrent protector and a protector housing, the overcurrent protector is arranged in the protector housing, the protector housing is arranged in the inner hole of the threaded pipe joint, the overcurrent protector is provided with a wire connecting column that penetrates the protector housing and extends to the pump cover through the inner hole of the threaded pipe joint, the outer end of the protector housing is provided with a limit plate located on the end face of the threaded pipe joint, the inner side of the nut is provided with a heat conducting plate in contact with the limit plate, and the heat conducting plate is provided with a heat sink extending to the outside of the nut.

2. The submersible pump overcurrent protection device according to claim 1, characterized in that: The threaded pipe joint is provided with an external thread corresponding to the nut.

3. The submersible pump overcurrent protection device according to claim 1, characterized in that: The nut is an insulating plastic nut.

4. The submersible pump overcurrent protection device according to claim 1, characterized in that: The protector shell and the limiting piece adopt an integrated insulating plastic structure.

5. The submersible pump overcurrent protection device according to claim 1, characterized in that: The heat conducting sheet and the heat sink adopt an integrated aluminum alloy structure.

6. The submersible pump overcurrent protection device according to claim 1, characterized in that: The threaded pipe joint is provided with a sealing gasket corresponding to the nut.

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