A centrifugal pump with built-in drainage structure

Abstract

The present invention discloses a centrifugal pump with a built-in drainage structure, aiming to provide a centrifugal pump with a built-in drainage structure that can not only improve the structural compactness of the centrifugal pump and help reduce the volume of the centrifugal pump, but also shorten the length of the pump shaft, thereby helping to reduce the difficulty of pump shaft processing and the vibration of the pump shaft during operation. The centrifugal pump comprises a pump body, a pump cover, a pump shaft, a drainage pipe, and a pump cavity formed between the pump body and the pump cover. The pump cover is provided with a pump cover sleeve for cooperating with the pump shaft, one end of the pump cover sleeve extends into the pump cavity, the end of the pump shaft passes through the pump cover sleeve and extends into the pump cavity, a front sealing ring and a rear sealing ring are provided between the pump shaft and the pump cover sleeve, a pump cover sleeve drainage port is provided on the pump cover sleeve, the pump cover sleeve drainage port is located between the front sealing ring and the rear sealing ring, the pump cover is provided with a pump cover drainage port, the drainage pipe is located in the pump cavity, and the drainage pipe connects the pump cover sleeve drainage port and the pump cover drainage port.

Description

Technical Field

[0001] The invention relates to a centrifugal pump, in particular to a centrifugal pump with a built-in drainage structure. Background Art

[0002] A centrifugal pump is a pump that transports liquids by the centrifugal force generated by the rotation of the impeller. When the mechanical seal on the pump shaft of an existing centrifugal pump fails, water needs to be drained out of the centrifugal pump through a drainage structure to prevent water from flowing along the pump shaft into the motor and affecting the operation of the centrifugal pump. This drainage structure on existing centrifugal pumps generally uses a bracket and a bracket drainage channel. Specifically, a centrifugal pump generally includes a pump body, a pump cover, a pump shaft, a motor, a bracket, and a bracket drainage channel provided on the inner wall of the bracket. The bracket is located between the pump cover and the motor, the bracket is mounted on the pump cover, and the motor is mounted on the bracket. After the mechanical seal on the pump shaft of the centrifugal pump fails, the water in the pump chamber will flow along the pump shaft into the cavity between the pump cover and the bracket, and then flow out to the outside of the centrifugal pump through the bracket drainage channel to prevent water from flowing into the motor along the pump shaft. In this way, after the mechanical seal on the pump shaft of the centrifugal pump fails, although water can be prevented from flowing into the motor along the pump shaft, the provision of the bracket not only increases the overall length of the centrifugal pump product and increases the volume of the centrifugal pump, but also increases the length of the pump shaft, increases the difficulty of pump shaft processing, and makes it more difficult to ensure the vibration of the pump shaft during operation. Summary of the Invention

[0003] The purpose of the present invention is to provide a centrifugal pump with a built-in drainage structure that can not only improve the structural compactness of the centrifugal pump and help reduce the volume of the centrifugal pump; but also shorten the length of the pump shaft, thereby helping to reduce the difficulty of pump shaft processing and the vibration of the pump shaft during operation.

[0004] The technical solution of the present invention is:

[0005] A centrifugal pump with a built-in drainage structure includes a pump body, a pump cover, a pump shaft, a drainage pipe and a pump chamber formed between the pump body and the pump cover, the pump cover is provided with a pump cover sleeve for cooperating with the pump shaft, one end of the pump cover sleeve extends into the pump chamber, the end of the pump shaft passes through the pump cover sleeve and extends into the pump chamber, a front sealing ring and a rear sealing ring are provided between the pump shaft and the pump cover sleeve, a pump cover sleeve drain port is provided on the pump cover sleeve, the pump cover sleeve drain port is located between the front sealing ring and the rear sealing ring, and the pump cover sleeve drain port is located in the pump chamber, a pump cover is provided with a pump cover drain port, the drainage pipe is located in the pump chamber, and the drainage pipe connects the pump cover sleeve drain port and the pump cover drain port.

[0006] Compared with the centrifugal pump in the prior art, which sets a bracket and a bracket drainage channel as a drainage structure after the mechanical seal fails to prevent water from flowing into the motor along the pump shaft; the centrifugal pump of this scheme has the drainage structure built into the pump cavity, thereby improving the structural compactness of the centrifugal pump, shortening the pump shaft length, and reducing the volume of the centrifugal pump, which is beneficial to reducing the difficulty of pump shaft processing and the vibration of the pump shaft during operation. Specifically, this solution directly sets a pump cover sleeve on the pump cover so that one end of the pump cover sleeve extends into the pump cavity, and uses the space of the pump cavity to arrange the pump cover sleeve so that the drainage pipe and the pump cover sleeve drainage port can be arranged in the pump cavity, and the pump cover sleeve drainage port and the pump cover drainage port are connected by the drainage pipe. In this way, after the front sealing ring near one end of the pump cover sleeve fails, the water flowing out of the pump cavity will be discharged through the drainage pipe and will not flow into the motor of the centrifugal pump along the pump shaft; at the same time, the drainage structure is built into the pump cavity, and there is no need to set a bracket between the pump cover and the motor, thereby improving the structural compactness of the centrifugal pump, reducing the volume of the centrifugal pump, and shortening the length of the pump shaft, which is conducive to reducing the difficulty of pump shaft processing and the problem of pump shaft vibration during operation. On the other hand, compared with the centrifugal pump in the prior art that uses a bracket and a bracket drainage channel as a drainage structure after the mechanical seal fails, the centrifugal pump of this solution directly uses a built-in drainage pipe for the drainage structure, which also eliminates the bracket structure, reduces the number of parts, and is conducive to cost saving.

[0007] Preferably, the centrifugal pump further comprises an electric drive device for driving the pump shaft, wherein the electric drive device is directly mounted on the pump cover. Directly mounting the electric drive device on the pump cover can simplify the centrifugal pump structure, improve the structural compactness of the centrifugal pump, and reduce the size of the centrifugal pump.

[0008] Preferably, the electric drive device includes a housing directly mounted on the pump cover, with the other end of the pump cover sleeve extending into a cavity of the housing. A bearing for engaging the pump shaft is disposed within the other end of the pump cover sleeve. This arrangement ensures the operational stability of the pump shaft and reduces vibration during operation. Furthermore, the space within the housing of the electric drive device can be utilized for arranging the bearing, thereby improving the compactness of the centrifugal pump and reducing its size. Furthermore, the length of the pump shaft is shortened, reducing the difficulty of pump shaft machining and the vibration of the pump shaft during operation.

[0009] Preferably, the electric drive device and the pump chamber are located on opposite sides of the pump cover. Such a layout is conducive to improving the structural compactness of the centrifugal pump.

[0010] Preferably, a bearing is provided within the pump cover that mates with the pump shaft, with one end of the pump cover, the front seal ring, and the rear seal ring all located on the same side of the bearing. This ensures the operational stability of the pump shaft through the bearing and reduces vibration during operation.

[0011] Preferably, a pump diaphragm is provided in the pump cavity, the pump diaphragm is fixed to the inner wall of the pump body, the pump diaphragm is provided with a mounting hole, and one end of the pump cover is fixed in the mounting hole. In this way, the stability of the pump cover can be ensured.

[0012] Preferably, it also includes an impeller, and the pump partition divides the pump chamber into a front pump chamber and a rear pump chamber. A connecting hole connecting the front pump chamber and the rear pump chamber is provided on the pump partition. The front pump chamber and the rear pump chamber are distributed along the axial direction of the pump shaft. The impeller is fixed on the pump shaft, and the impeller is located in the front pump chamber.

[0013] As a preference, the drainage pipe is located in the rear pump chamber, so that the drainage pipe is prevented from affecting the operation of the impeller.

[0014] Preferably, the height of the pump cover drain opening is lower than the height of the pump cover sleeve drain opening. In this way, after the front sealing ring near one end of the pump cover sleeve fails, the water flowing out of the pump cavity will be discharged through the drainage pipe.

[0015] Preferably, one end of the drainage pipe is sealedly connected to the drain port of the pump cover, and the other end of the drainage pipe is sealedly connected to the drain port of the pump cover.

[0016] The beneficial effects of the present invention are:

[0017] The present invention directly arranges a pump cover sleeve on the pump cover, so that one end of the pump cover sleeve extends into the pump cavity, and the space in the pump cavity is used to arrange the pump cover sleeve so that the drainage pipe and the pump cover sleeve drainage port can be arranged in the pump cavity, and the drainage pipe connects the pump cover sleeve drainage port and the pump cover drainage port through the drainage pipe. In this way, after the front sealing ring near one end of the pump cover sleeve fails, the water flowing out of the pump cavity will be discharged through the drainage pipe and will not flow into the motor of the centrifugal pump along the pump shaft. At the same time, the drainage structure is built into the pump cavity, and there is no need to set a bracket between the pump cover and the motor, thereby improving the structural compactness of the centrifugal pump, reducing the volume of the centrifugal pump, and shortening the length of the pump shaft, which is conducive to reducing the difficulty of pump shaft processing and the problem of pump shaft vibration during operation. On the other hand, compared with the centrifugal pump in the prior art that uses a bracket and a bracket drainage channel as the drainage structure after the mechanical seal fails, the centrifugal pump of this solution directly uses a built-in drainage pipe for the drainage structure, which also eliminates the bracket structure, reduces the number of parts, and is conducive to cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial cross-sectional structural schematic diagram of a centrifugal pump with a built-in drainage structure of the present invention.

[0019] Figure 2 It is a three-dimensional structural schematic diagram of a centrifugal pump with a built-in drainage structure of the present invention.

[0020] In the picture:

[0021] Pump body 1;

[0022] Pump cover 2;

[0023] Impeller 3;

[0024] Pump shaft 4;

[0025] Electric drive equipment 5;

[0026] Drain pipe 6;

[0027] Pump chamber 7, front pump chamber 7.1, rear pump chamber 7.2;

[0028] Pump cover 8;

[0029] Pump diaphragm 9;

[0030] Front sealing ring 10;

[0031] Pump cover drain port 11;

[0032] Rear sealing ring 12;

[0033] Pump cover drain port 13;

[0034] Bearing 14. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0036] Specific embodiment 1: Figure 1 、 Figure 2 Figure 1 shows a centrifugal pump with a built-in drainage structure, comprising a pump body 1, a pump cover 2, an impeller 3, a pump shaft 4, an electric drive device 5 for driving the pump shaft, a drainage pipe 6, and a pump chamber 7 formed between the pump body and the pump cover. The pump body and the pump cover are hermetically connected. In this embodiment, the electric drive device is a motor. The pump cover is provided with a pump cover sleeve 8 for engaging the pump shaft. The pump cover sleeve is fixed to the pump cover and hermetically connected to the pump cover. One end of the pump cover sleeve extends into the pump chamber. The pump cover sleeve is coaxial with the pump shaft. The end of the pump shaft passes through the pump cover sleeve and extends into the pump chamber. The impeller is fixed to the pump shaft and is located in the pump chamber. A front sealing ring 10 and a rear sealing ring 12 are provided between the pump shaft and the pump cover sleeve. In this embodiment, the impeller, front sealing ring, and rear sealing ring are arranged in sequence along the axial direction of the pump shaft. The pump cover sleeve is provided with a pump cover sleeve drainage port 11, located between the front sealing ring and the rear sealing ring, and the pump cover sleeve drainage port is located within the pump chamber. The pump cover is provided with a pump cover drain port 13. A drainage pipe 6 is located in the pump chamber. The drainage pipe connects the pump cover drain port and the pump cover drain port. Specifically, one end of the drainage pipe is sealed with the pump cover drain port, and the other end of the drainage pipe is sealed with the pump cover drain port.

[0037] Compared with the centrifugal pump in the prior art, which sets a bracket and a bracket drainage channel as a drainage structure after the mechanical seal fails to prevent water from flowing into the motor along the pump shaft; the centrifugal pump of this embodiment has the drainage structure built into the pump cavity, thereby improving the structural compactness of the centrifugal pump, shortening the pump shaft length, and reducing the volume of the centrifugal pump, which is beneficial to reducing the difficulty of pump shaft processing and the vibration of the pump shaft during operation. Specifically, this solution is to directly set a pump cover sleeve on the pump cover so that one end of the pump cover sleeve extends into the pump cavity, and use the space in the pump cavity to arrange the pump cover sleeve, so that the drainage pipe and the pump cover sleeve drainage port can be arranged in the pump cavity, and connect the pump cover sleeve drainage port and the pump cover drainage port through the drainage pipe. In this way, after the front sealing ring near one end of the pump cover sleeve fails, the water flowing out of the pump cavity will be discharged through the drainage pipe and will not flow into the motor of the centrifugal pump along the pump shaft; at the same time, the drainage structure is built into the pump cavity, and there is no need to set a bracket between the pump cover and the motor, thereby improving the structural compactness of the centrifugal pump, reducing the volume of the centrifugal pump, and shortening the pump shaft length, which is conducive to reducing the difficulty of pump shaft processing and the problem of pump shaft vibration during operation.

[0038] On the other hand, compared with the centrifugal pump in the prior art that uses a bracket and a bracket drainage channel as the drainage structure after the mechanical seal fails, the centrifugal pump of this scheme directly uses a built-in drainage pipe as the drainage structure. It also eliminates the bracket structure, reduces the number of parts, and is conducive to cost savings.

[0039] Further, such as Figure 1 As shown, the pump cover drain port is located at a lower height than the pump cover sleeve drain port. In this embodiment, the pump cover drain port is located at the lower portion of the pump cover. This allows water from the pump chamber to be drained through the drain pipe if the front sealing ring near one end of the pump cover sleeve fails.

[0040] Further, such as Figure 1 、 Figure 2 As shown, the electric drive device 5 is directly mounted on the pump cover 2. In this embodiment, the motor constituting the electric drive device is directly mounted on the pump cover. The electric drive device and the pump chamber are located on opposite sides of the pump cover. Mounting the electric drive device directly on the pump cover simplifies the centrifugal pump structure, improving its compactness and reducing its size.

[0041] Further, such as Figure 1 As shown, the pump cover 8 houses a bearing 14 that mates with the pump shaft. One end of the pump cover, the front seal, and the rear seal are all located on the same side of the bearing (where "one end of the pump cover" refers to the end of the pump cover that extends into the pump chamber). This ensures the operational stability of the pump shaft and reduces vibration during operation.

[0042] The electric drive device includes a housing. The housing is mounted directly on the pump cover. The other end of the pump cover sleeve 8 extends into the cavity of the housing. Bearing 14 is located within the other end of the pump cover sleeve. This design ensures the operational stability of the pump shaft and reduces shaft vibration during operation. Furthermore, the space within the electric drive device's housing can be utilized for the bearing arrangement, improving the compactness of the centrifugal pump and reducing its size. It also helps shorten the pump shaft, reducing the difficulty of shaft machining and any vibration during operation.

[0043] Further, such as Figure 1 As shown, a pump diaphragm 9 is provided in the pump chamber 7 and fixed to the inner wall of the pump body. The pump diaphragm has a mounting hole. One end of the pump cover 8 is fixed in the mounting hole. This ensures the stability of the pump cover.

[0044] The pump diaphragm 9 divides the pump chamber into a front pump chamber 7.1 and a rear pump chamber 7.2. A communication hole is provided on the pump diaphragm, connecting the front and rear pump chambers. The front and rear pump chambers are arranged axially along the pump shaft, with the impeller 3 located in the front pump chamber. The drainage pipe 6 is located in the rear pump chamber. This prevents the drainage pipe from interfering with the operation of the impeller. The drainage pipe can be curved or straight, depending on actual needs.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A centrifugal pump with a built-in drainage structure, comprising a pump body, a pump cover, a pump shaft, and a pump cavity formed between the pump body and the pump cover, characterized in that: The pump cover is provided with a pump cover sleeve for cooperating with the pump shaft, one end of the pump cover sleeve extends into the pump cavity, the end of the pump shaft passes through the pump cover sleeve and extends into the pump cavity, a front sealing ring and a rear sealing ring are provided between the pump shaft and the pump cover sleeve, a pump cover sleeve drain port is provided on the pump cover sleeve, the pump cover sleeve drain port is located between the front sealing ring and the rear sealing ring, the pump cover sleeve drain port is located in the pump cavity, a pump cover is provided with a pump cover drain port, a drainage pipe is located in the pump cavity, and the drainage pipe connects the pump cover sleeve drain port and the pump cover drain port; The electric drive device is directly mounted on the pump cover, including the housing, and the other end of the pump cover sleeve extends into the cavity of the housing; A pump diaphragm is provided in the pump cavity, the pump diaphragm is fixed on the inner wall of the pump body, a mounting hole is provided on the pump diaphragm, and one end of the pump cover is fixed in the mounting hole; The pump partition separates the pump chamber into a front pump chamber and a rear pump chamber. A connecting hole is provided on the pump partition to connect the front pump chamber and the rear pump chamber. The impeller is fixed on the pump shaft and is located in the front pump chamber. The drain pipe is located in the rear pump chamber.

2. A centrifugal pump with a built-in drainage structure according to claim 1, characterized in that: The other end of the pump cover is provided with a bearing matched with the pump shaft.

3. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: The electric drive device and the pump chamber are located on opposite sides of the pump cover.

4. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: A bearing matched with the pump shaft is arranged in the pump cover, and one end of the pump cover, the front sealing ring and the rear sealing ring are all located on the same side of the bearing.

5. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: The front pump cavity and the rear pump cavity are distributed along the axial direction of the pump shaft.

6. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: The height of the position where the pump cover drain port is located is lower than the height of the position where the pump cover sleeve drain port is located.

7. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: The pump cover drain port is located at the lower part of the pump cover.

8. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: The electric drive device is an electric motor.

9. A centrifugal pump with a built-in drainage structure according to claim 1 or 2, characterized in that: One end of the drainage pipe is sealed and connected to the drainage port of the pump cover, and the other end of the drainage pipe is sealed and connected to the drainage port of the pump cover.

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