Submersible pump check structure

Abstract

The utility model provides a submersible pump check structure belongs to water pump technical field. It solved the problem that the existing check structure operation is not stable. In the utility model, the submersive pump includes pump cylinder, the water outlet section of being equipped with the top of pump cylinder and the water passing cylinder being vertically arranged in the pump cylinder and being used for the communication of pump cylinder and water outlet section, and the check structure includes the sealing plate and the spring of making sealing plate have the tendency of moving downward and closing the upper port of water passing cylinder, which are all arranged in the water outlet section, the water passing cylinder top extends upward and is shaped into the installation cylinder, and the top of installation cylinder is open. The positioning pipe is vertically fixed in the installation cylinder, the top of positioning pipe is closed, the bottom is open, the sealing plate is in the installation cylinder, the top of sealing plate is vertically shaped into the guide pipe, the positioning pipe is sleeved on the guide pipe, and the spring is arranged in the chamber formed between the positioning pipe and the guide pipe. When the sealing plate moves upward under the action of fluid pressure, it will touch the lower end of the positioning pipe and close the lower port of the positioning pipe. The submersible pump check structure is stable in operation.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and relates to a submersible pump, particularly a submersible pump check valve structure. Background Technology

[0002] When a deep well pump is operating, the backflow of high-pressure water can create water hammer, which can severely impact the pump's impeller. In severe cases, this can lead to impeller deformation and disrupt the pump's normal operation. Therefore, most existing deep well pumps are equipped with check valves to prevent water hammer.

[0003] Existing check valves, such as the waterproof hammer check valve for deep well pumps disclosed in the Chinese Patent Database (application number: 202122197811.3), are installed at the outlet of the deep well pump. The valves are characterized by comprising a plug, a spring, and a support plate. One end of the spring abuts against the support plate, and the other end abuts against the plug. The spring always has an elastic tendency to guide the plug towards the outlet and seal it. The plug is a rotating structure with a guide rod at its center. The guide rod is inserted into the guide cylinder of the support plate, and the plug reciprocates along the axis of the guide rod. The plug includes a head and a flange. The head is a cylindrical structure with a spherical free end. The outer diameter of the flange is larger than the outer diameter of the head, and the end face of the flange can seal against the outlet.

[0004] In the aforementioned check valve, the spring is directly exposed without protection, and contaminants in the fluid can easily become entangled on the spring, affecting its extension and contraction, and thus impacting the operation of the check valve. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a stable check valve structure for submersible pumps.

[0006] The objective of this utility model can be achieved through the following technical solution: a check valve structure for a submersible pump, the submersible pump including a pump barrel, an outlet section located at the top of the pump barrel, and a water passage cylinder vertically arranged inside the pump barrel for connecting the pump barrel and the outlet section. The check valve structure includes sealing plates both located inside the outlet section and a spring that causes the sealing plates to move downwards and close the upper port of the water passage cylinder. The water passage cylinder has an integrally formed mounting cylinder extending upwards from its top, the mounting cylinder and the water passage cylinder are coaxial, and the top of the mounting cylinder is open. A positioning tube is vertically fixed inside the mounting cylinder, with the top of the positioning tube closed and the bottom open. The sealing plate is located inside the mounting cylinder, and a guide tube is vertically formed at the top of the sealing plate. The positioning tube is sleeved outside the guide tube, and the spring is located in the cavity formed between the positioning tube and the guide tube. When the sealing plate moves upwards under fluid pressure, it will abut against the lower end of the positioning tube and close the lower port of the positioning tube.

[0007] When in use, the high-pressure fluid generated by the submersible pump is discharged into the water passage cylinder. The fluid pushes the sealing plate to overcome the spring force and move upward to open the upper port of the water passage cylinder. The fluid is finally discharged into the outlet section through the installation cylinder and then discharged.

[0008] With the top of the positioning tube closed and the lower port of the positioning tube closed when the sealing plate moves upward, the spring is in a relatively closed chamber during the operation of the submersible pump. This effectively prevents contaminants in the fluid from contacting the spring, ensuring stable operation of the spring and improving the working stability of this check valve structure.

[0009] In the aforementioned submersible pump check valve structure, the inner wall of the positioning tube at the lower port is a conical sealing surface one, with the diameter of the sealing surface one gradually increasing from top to bottom. A corresponding sealing surface two, matching the sealing surface one, is provided on the sealing plate, and the sealing plate seals the lower port of the positioning tube by tightly abutting the sealing surface one with the sealing surface two. With the cooperation of sealing surface one and sealing surface two, the purpose of sealing the lower port of the positioning tube can be stably achieved, and the position of the sealing plate can be corrected to ensure the stable sealing of the upper port of the water-passing cylinder.

[0010] In the aforementioned submersible pump check valve structure, the bottom of the conduit is sealed; the spring is located inside the conduit, with its two ends pressing against the inner side of the top wall of the positioning tube and the bottom wall of the conduit, respectively. This design effectively reduces the outer diameter of the positioning tube, decreases the space occupied by the positioning tube within the mounting cylinder, and improves drainage efficiency.

[0011] In the aforementioned submersible pump check structure, a strip groove is provided through the side wall of the mounting cylinder, and the length of the strip groove extends along the axial direction of the mounting cylinder to further improve drainage efficiency.

[0012] In the aforementioned submersible pump check valve structure, the outer wall of the positioning tube has a vertically arranged positioning strip. This strip is evenly spaced along the circumference of the positioning tube and is pressed and fixed against the inner wall of the mounting cylinder. The positioning tube is fixed to the mounting cylinder using its own structure, offering advantages such as simple structure and convenient installation.

[0013] In the aforementioned submersible pump check valve structure, an interference fit is formed between the positioning strip and the inner wall of the mounting cylinder. This allows for easy installation simply by pressing the positioning tube into place, further facilitating assembly.

[0014] In the aforementioned submersible pump check structure, a limiting unit is also provided inside the mounting cylinder. A limiting strip is vertically formed inside the mounting cylinder. The limiting unit consists of two limiting strips distributed along the circumference of the mounting cylinder, and a groove matching the positioning strip is formed between the two limiting strips in the same limiting unit. One of the positioning strips is locked in the groove to restrict the mounting cylinder in the circumference and improve the working stability of the check structure.

[0015] In the aforementioned submersible pump check structure, the inner wall of the mounting cylinder has an annular positioning step, and the lower end of the positioning strip presses against the bottom wall of the positioning step to limit the insertion of the positioning tube, further facilitating assembly.

[0016] Compared with existing technologies, the check valve structure of this submersible pump has the following advantages: 1. With the combination of the top of the positioning tube being closed and the lower port of the positioning tube being closed when the sealing plate moves upward, the spring is placed in a relatively closed chamber during the operation of the submersible pump. This effectively prevents contaminants in the fluid from contacting the spring, ensuring stable operation of the spring and improving the working stability of this check valve structure.

[0017] 2. With the cooperation of sealing surface one and sealing surface two, the purpose of sealing the lower port of the positioning tube can be stably achieved, and the position of the sealing plate can be corrected to ensure that the purpose of sealing the upper port of the water tube is stably achieved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation of the check valve structure for a submersible pump.

[0019] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0020] Figure 3 This is a schematic diagram showing the connection between the mounting cylinder and the positioning tube.

[0021] In the diagram, 1. Pump cylinder; 2. Outlet section; 3. Water passage cylinder; 3a. Annular flange; 3b. Mounting cylinder; 3b1. Strip groove; 3c. Positioning step; 3d. Limiting strip; 3e. Slot; 4. Sealing plate; 4a. Plate body; 4b. Sealing gasket; 4c. Conduit; 5. Spring; 6. Positioning tube; 6a. Sealing surface one; 6b. Positioning strip. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, in the submersible pump check valve structure, the submersible pump includes a pump casing 1, a cylindrical outlet section 2, and a water passage cylinder 3, all three being coaxially arranged. The outlet section 2 is fixed to the top of the pump casing 1; the water passage cylinder 3 is vertically positioned inside the pump casing 1 and connects the pump casing 1 and the outlet section 2. The upper sidewall of the water passage cylinder 3 is bent inward to form an annular flange 3a, which is coaxially arranged with the water passage cylinder 3, and the inner hole of the annular flange 3a is the upper port of the water passage cylinder 3. In actual products, the upper end of the submersible pump shaft is rotatably supported on the water passage cylinder 3.

[0024] The check valve structure of this submersible pump includes sealing plates 4 all disposed within the outlet section 2 and springs 5 ​​that cause the sealing plates 4 to move downwards and close the upper port of the water passage cylinder 3. Specifically, the sealing plate 4 includes a horizontally disposed plate body 4a and a sealing gasket 4b abutting and fixed to the bottom surface of the plate body 4a, and the sealing plate 4 uses the sealing gasket 4b to press against the aforementioned annular flange 3a to close the upper port of the water passage cylinder 3. Preferably, the sealing gasket 4b and the plate body 4a are bonded and fixed together.

[0025] like Figure 1 and Figure 2 As shown, an integrally formed mounting cylinder 3b extends upward from the top of the water-passing cylinder 3. The mounting cylinder 3b and the water-passing cylinder 3 are coaxial, and the top of the mounting cylinder 3b is open. A positioning tube 6 is vertically fixed inside the mounting cylinder 3b. The positioning tube 6 and the mounting cylinder 3b are coaxial, and the top of the positioning tube 6 is closed while the bottom is open. A sealing plate 4 is located inside the lower end of the mounting cylinder 3b. A guide tube 4c is vertically formed on the top of the plate body 4a. The guide tube 4c and the plate body 4a are an integral structure, and the guide tube 4c and the mounting cylinder 3b are coaxial. The positioning tube 6 is sleeved on the outside of the guide tube 4c, and a spring 5 is located in the cavity formed between the positioning tube 6 and the guide tube 4c. When the sealing plate 4 moves upward under the action of fluid pressure, it will abut against the lower end of the positioning tube 6 and close the lower port of the positioning tube 6.

[0026] When in use, the high-pressure fluid generated by the submersible pump is discharged into the water passage cylinder 3. The fluid pushes the sealing plate 4 to overcome the elastic force of the spring 5 and move upward to open the upper port of the water passage cylinder 3. The fluid is finally discharged into the outlet section 2 through the mounting cylinder 3b and then discharged.

[0027] With the top of the positioning tube 6 closed and the lower port of the positioning tube 6 closed when the sealing plate 4 moves upward, the spring 5 is placed in a relatively closed chamber during the operation of the submersible pump. This effectively prevents contaminants in the fluid from contacting the spring 5, ensuring the stable operation of the spring 5 and improving the working stability of this check valve structure.

[0028] In this embodiment, like Figure 2 As shown, the sealing plate 4 seals the lower port of the positioning tube 6 in the following specific way: the inner wall of the positioning tube 6 at the lower port is a conical sealing surface 6a, and the diameter of the sealing surface 6a gradually increases from top to bottom; the sealing plate 4 is provided with a corresponding sealing surface 2 that matches the sealing surface 6a, that is, the diameter of the sealing surface 2 also gradually increases from top to bottom. The sealing plate 4 seals the lower port of the positioning tube 6 by tightly abutting the sealing surface 6a with the sealing surface 2. With the cooperation of the sealing surface 6a and the sealing surface 2, the purpose of sealing the lower port of the positioning tube 6 can be stably achieved by the sealing plate 4, and the position of the sealing plate 4 can be corrected to ensure that the purpose of sealing the upper port of the water cylinder 3 is stably achieved.

[0029] The spring 5 is installed as follows: the bottom of the conduit 4c is closed; the spring 5 is located inside the conduit 4c, and both ends of the spring 5 press against the inner side of the top wall of the positioning tube 6 and the bottom wall of the conduit 4c, respectively. This design effectively reduces the outer diameter of the positioning tube 6, decreases the space occupied by the positioning tube 6 within the mounting cylinder 3b, and improves drainage efficiency. Preferably, the outer diameter of the conduit 4c is slightly smaller than the inner diameter of the positioning tube 6 to improve the sliding accuracy and stability of the sealing plate 4.

[0030] like Figure 2 and Figure 3 As shown, the positioning tube 6 is installed as follows: A vertically arranged positioning strip 6b is formed around the outer wall of the positioning tube 6, and the positioning strip 6b and the positioning tube 6 are an integral structure. The positioning strips 6b are evenly distributed around the circumference of the positioning tube 6, forming a drainage channel between adjacent positioning strips 6b, and the positioning strips 6b are pressed and fixed against the inner wall of the mounting cylinder 3b. The positioning tube 6 is fixedly connected to the mounting cylinder 3b using its own structure, offering advantages such as simple structure and convenient installation.

[0031] Preferably, the positioning strip 6b and the inner wall of the mounting cylinder 3b form an interference fit, so that the positioning tube 6 can be installed simply by pressing it in as a whole, which further facilitates assembly. To further explain, the inner wall of the mounting cylinder 3b has an annular positioning step 3c, which is coaxially arranged with the mounting cylinder 3b. The lower end of the positioning strip 6b presses against the bottom wall of the positioning step 3c, which is used to limit the pressing of the positioning tube 6, allowing the positioning tube 6 to be pressed into place in one go, further facilitating assembly.

[0032] Furthermore, such as Figure 3 As shown, a limiting unit is also provided inside the mounting cylinder 3b. A limiting strip 3d is vertically formed inside the mounting cylinder 3b, and the limiting strip 3d and the mounting cylinder 3b are an integral structure. The limiting unit consists of two limiting strips 3d distributed circumferentially along the mounting cylinder 3b, and a groove 3e matching the positioning strip 6b is formed between the two limiting strips 3d in the same limiting unit. One of the positioning strips 6b is engaged in the groove 3e to restrict the mounting cylinder 3b circumferentially and improve the working stability of the check valve structure. Preferably, there are two limiting units distributed circumferentially along the mounting cylinder 3b to further enhance the positioning stability of the positioning tube 6.

[0033] In the actual product, a strip groove 3b1 is provided through the side wall of the mounting cylinder 3b, and the length of the strip groove 3b1 extends along the axial direction of the mounting cylinder 3b to further improve drainage efficiency. Among them, there are at least two strip grooves 3b1 and they are evenly distributed along the circumference of the mounting cylinder 3b.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A check valve structure for a submersible pump, the submersible pump comprising a pump barrel (1), an outlet section (2) disposed at the top of the pump barrel (1), and a water passage cylinder (3) vertically disposed within the pump barrel (1) for connecting the pump barrel (1) and the outlet section (2), the check valve structure comprising sealing plates (4) disposed within the outlet section (2) and springs (5) for causing the sealing plates (4) to move downwards and close the upper port of the water passage cylinder (3), characterized in that, The top of the water-passing cylinder (3) extends upward and is integrally formed with an installation cylinder (3b). The installation cylinder (3b) and the water-passing cylinder (3) are coaxial, and the top of the installation cylinder (3b) is open. A positioning tube (6) is vertically fixed inside the installation cylinder (3b). The top of the positioning tube (6) is closed and the bottom is open. The sealing plate (4) is located inside the installation cylinder (3b). A conduit (4c) is vertically formed on the top of the sealing plate (4). The positioning tube (6) is sleeved outside the conduit (4c). The spring (5) is set in the cavity formed between the positioning tube (6) and the conduit (4c). When the sealing plate (4) moves upward under the action of fluid pressure, it will abut against the lower end of the positioning tube (6) and close the lower port of the positioning tube (6).

2. The submersible pump check valve structure according to claim 1, characterized in that, The inner wall of the positioning tube (6) at the lower port is a tapered sealing surface 1 (6a), and the diameter of the sealing surface 1 (6a) gradually increases from top to bottom; the sealing plate (4) is provided with a sealing surface 2 that matches the sealing surface 1 (6a), and the sealing plate (4) seals the lower port of the positioning tube (6) by tightly abutting the sealing surface 1 (6a) with the sealing surface 2.

3. The submersible pump check valve structure according to claim 1 or 2, characterized in that, The bottom of the conduit (4c) is closed; the spring (5) is inside the conduit (4c), and the two ends of the spring (5) press against the inner side of the top wall of the positioning tube (6) and the bottom wall of the conduit (4c) respectively.

4. The submersible pump check valve structure according to claim 1, characterized in that, A strip groove (3b1) is provided through the side wall of the mounting cylinder (3b), and the length of the strip groove (3b1) extends along the axial direction of the mounting cylinder (3b).

5. The submersible pump check valve structure according to claim 1, characterized in that, The outer wall of the positioning tube (6) has a vertically arranged positioning strip (6b). The positioning strip (6b) is evenly distributed around the circumference of the positioning tube (6) and is pressed and fixed against the inner wall of the mounting cylinder (3b).

6. The submersible pump check structure according to claim 5, characterized in that, An interference fit is formed between the positioning strip (6b) and the inner wall of the mounting cylinder (3b).

7. The submersible pump check structure according to claim 6, characterized in that, The mounting cylinder (3b) is also provided with a limiting unit. A limiting strip (3d) is vertically formed inside the mounting cylinder (3b). The limiting unit consists of two limiting strips (3d) distributed around the circumference of the mounting cylinder (3b). The two limiting strips (3d) in the same limiting unit form a slot (3e) that matches the positioning strip (6b). One of the positioning strips (6b) is engaged in the slot (3e).

8. The submersible pump check valve structure according to claim 6, characterized in that, The inner wall of the mounting cylinder (3b) has an annular positioning step (3c), and the lower end of the positioning strip (6b) presses against the bottom wall of the positioning step (3c).

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