Non-return structure of deep-well pump

Abstract

The utility model provides a non-return structure of a deep-well pump, and belongs to the technical field of water pumps. The check valve solves the problem that an existing check valve is inconvenient to maintain. The deep well pump comprises a pump cylinder and a cylindrical water outlet section, the lower end of the water outlet section is fixed in the pump cylinder, the non-return structure comprises a valve element and an annular seat which are horizontally arranged in the water outlet section, the valve element comprises a disc-shaped body, the outer side of the annular seat is fixedly connected with the water outlet section in a sealed mode, and the annular seat is fixedly connected with the pump cylinder. The edge of the body can be pressed on the inner side of the annular base to seal an upper end opening of the annular base, a limiting piece used for limiting the upward moving distance of the body is further arranged in the water outlet joint, a conical flow guide face is arranged in the middle of the upper side face of the body, and the diameter of the flow guide face is gradually increased from top to bottom. A circle of micropores vertically penetrate through the flow guide face, and the diameter of the micropores is 1-2 mm. The non-return structure of the deep-well pump is convenient to maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps, and relates to a deep well pump, in particular to a check structure for a deep well pump. Background Technique

[0002] The check valve of the deep well pump is an important component in the deep well pump system. Its main function is to prevent the water flow from flowing back when the pump stops working, thereby protecting the deep well pump and its related pipeline equipment from damage.

[0003] The existing check valve, such as a check valve for a submersible well pump disclosed in the Chinese Patent Database (Application No.: 201420074785.2), the submersible well pump includes a pump casing. The check valve includes a cylindrical valve body. The valve body has a water inlet end and a water outlet end. The water inlet end of the valve body is fixedly connected to the pump casing. The feature is that a disc-shaped valve core is arranged in the valve body. The valve core can slide along the axial direction of the valve body. The outer edge of the valve core abuts against the valve body. A circular convex edge is circumferentially arranged on the inner wall of the valve body. Under the action of the water pressure at the water outlet end of the valve body, the valve core abuts against the circular convex edge. A limiting member capable of limiting the moving distance of the valve core is also arranged on the inner wall of the valve body. A plurality of water passing grooves are circumferentially arranged on the abutting surface of the valve core. The water passing grooves are respectively communicated with the water inlet end and the water outlet end of the valve body.

[0004] The above check valve uses the water passing grooves arranged on the abutting surface of the valve core to slowly return the water in the pipe to the pump casing to prevent the pipe from freezing and exploding at a lower temperature. However, there is still a problem with this check valve: the returned water enters the water passing grooves from the side of the valve core. Since the returned water often contains sand particles, the sand particles flow through the water to the gap between the side of the valve core and the inner wall of the valve body and accumulate, which often causes the valve core to be stuck and requires frequent maintenance, making it inconvenient to use. Summary of the Utility Model

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose a check structure for a deep well pump that is convenient to use.

[0006] The purpose of the present utility model can be achieved by the following technical solutions: A check structure for a deep well pump. The deep well pump includes a pump barrel and a cylindrical water outlet section, and the lower end of the water outlet section is fixedly arranged in the pump barrel. This check structure includes a valve core and an annular seat that are both horizontally arranged in the water outlet section. The valve core includes a disc-shaped body. The outer side of the annular seat is hermetically fixedly connected to the water outlet section. The edge of the body can press on the inner side of the annular seat to close the upper port of the annular seat. A limiting member for restricting the upward movement distance of the body is also arranged in the water outlet section. The feature is that the middle position of the upper side surface of the body is a conical guiding surface, and the diameter of the guiding surface gradually becomes larger from top to bottom; a circle of micropores is vertically penetrated through the guiding surface, and the aperture of the micropores is 1 mm to 2 mm.

[0007] During use, water in the water pipe slowly flows into the pump barrel through the micropores to prevent water from staying in the water pipe and freezing at a relatively low temperature, thus preventing the water pipe from bursting.

[0008] The micropores are arranged on a conical diversion surface, and the aperture of the micropores is extremely small. This can not only prevent sand grains from entering the micropores, but also utilize the slope of the diversion surface to avoid sand grains staying around the micropores, thereby effectively extending the duration of the micropores remaining open, reducing the cleaning and maintenance frequency, and facilitating use.

[0009] In the above deep well pump check valve structure, the edge of the above-mentioned body bends upward to form a retaining ring to block the sand grains rolling down from the diversion surface, prevent them from spreading around and hindering the movement of the valve core, and ensure the stable operation of the check valve structure.

[0010] In the above deep well pump check valve structure, the lower end of the water outlet section is screwed into the upper end of the pump barrel; the annular seat is detachably fixedly connected to the water outlet section. With the above design, it is convenient to take out the annular seat and the valve core for cleaning and maintenance.

[0011] In the above deep well pump check valve structure, an annular installation groove is formed on the inner wall of the water outlet section, a snap ring is arranged in the installation groove, and a positioning member which is annular and coaxially arranged with the water outlet section is also arranged in the water outlet section, and the outer edge of the annular seat is clamped and positioned between the snap ring and the positioning member. The annular seat is clamped between the snap ring and the positioning member, so that the annular seat is in a loose state after the snap ring is taken out, further facilitating cleaning and maintenance.

[0012] In the above deep well pump check valve structure, the positioning member includes a rubber ring and an annular surface formed on the inner wall of the water outlet section, and the upper and lower sides of the sealing ring are respectively tightly pressed on the annular surface and the annular seat. Setting a rubber ring above the outer edge of the annular seat can not only form a reliable seal between the annular seat and the water outlet section, but also utilize the elasticity of the rubber ring to reduce the installation accuracy requirements of the snap ring, facilitating processing.

[0013] As another solution, in the above deep well pump check valve structure, the annular seat is threadedly connected to the water outlet section.

[0014] In the above deep well pump check valve structure, the limiting member is a circle of retaining pieces arranged on the inner wall of the water outlet section, and the retaining pieces are in a circular arc shape coaxial with the water outlet section; the cross section of the retaining pieces is roughly in an L shape, the retaining pieces are composed of a horizontally arranged blocking portion and a vertically arranged connecting portion, and the blocking portion is above the connecting portion; the inner diameter of the connecting portion is adapted to the outer diameter of the retaining ring, and the valve core is restricted from moving upward by pressing on the bottom wall of the blocking portion through the top surface of the retaining ring. The retaining pieces are used to limit the upward movement distance of the valve core and also for guiding the sliding of the valve core. That is, in this application, the retaining pieces have a dual-purpose effect, simplifying the structure and facilitating assembly.

[0015] In the above deep well pump check valve structure, the retaining pieces and the water outlet section are of an integral structure to further facilitate assembly.

[0016] Compared with the prior art, the check structure of this deep well pump has the following advantages:

[0017] 1. The micropores are arranged on the conical guiding surface, and the aperture of the micropores is extremely small. In this way, it can not only prevent sand grains from entering the micropores, but also utilize the slope of the guiding surface to avoid sand grains staying around the micropores, thereby effectively prolonging the duration of the micropores staying in the open state, reducing the cleaning and maintenance frequency, and facilitating use.

[0018] 2. A rubber ring is arranged above the outer edge of the annular seat, which can not only form a reliable seal between the annular seat and the water outlet section, but also utilize the elasticity of the rubber ring to reduce the installation precision requirements of the circlip, facilitating processing.

[0019] 3. The retaining piece is used to limit the upward movement distance of the valve core and also for the sliding guidance of the valve core. That is, in this application, the retaining piece has a dual-purpose effect, simplifying the structure and facilitating assembly. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a deep well pump.

[0021] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0022] In the figure, 1. Pump barrel; 2. Water outlet section; 2a. Annular surface; 2b. Retaining piece; 2b1. Blocking part; 2b2. Connecting part; 3. Valve core; 3a. Body; 3b. Guiding surface; 3c. Micropore; 3d. Retaining ring; 4. Annular seat; 5. Circlip; 6. Rubber ring. Detailed Embodiments

[0023] The following are specific embodiments of the present invention in combination with the drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0024] As Figure 1 shown, in the check structure of the deep well pump,

[0025] the deep well pump includes a pump barrel 1 and a cylindrical water outlet section 2, and the lower end of the water outlet section 2 is fixed inside the upper end of the pump barrel 1. In actual products, the lower end of the water outlet section 2 is threadedly connected inside the upper end of the pump barrel 1.

[0026] As Figure 1 and Figure 2As shown in the figure, the check valve structure of this deep well pump includes a valve core 3 and an annular seat 4 that are both horizontally arranged in the water outlet section 2. Among them, the annular seat 4 is coaxially arranged with the water outlet section 2, and the outer side of the annular seat 4 is fixedly connected to the water outlet section 2 in a sealed manner; the valve core 3 includes a disc-shaped body 3a. The valve core 3 can slide up and down along the axis of the water outlet section 2 under the action of water pressure. A limiting member for restricting the upward movement distance of the body 3a is also provided in the water outlet section 2, and when the body 3a moves downward, it can press on the inner side of the annular seat 4 to close the upper port of the annular seat 4.

[0027] As Figure 2 shown, the middle position of the upper side of the body 3a is a conical guiding surface 3b, and the diameter of the guiding surface 3b gradually increases from top to bottom; a circle of micropores 3c runs vertically through the guiding surface 3b, and the pore diameter of the micropores 3c is 1 mm to 2 mm. Preferably, the pore diameter of the micropores 3c is 1.25 mm. Preferably, the number of the micropores 3c is 3.

[0028] During use, the water in the water pipe slowly flows into the pump barrel 1 through the micropores 3c to avoid the water staying in the water pipe and freezing at a lower temperature, preventing the water pipe from bursting.

[0029] The micropores 3c are arranged on the conical guiding surface 3b, and the pore diameter of the micropores 3c is extremely small. In this way, it can not only prevent sand grains from entering the micropores 3c, but also utilize the slope of the guiding surface 3b to avoid sand grains staying around the micropores 3c, thereby effectively prolonging the duration of the micropores 3c remaining open, reducing the cleaning and maintenance frequency, and facilitating use.

[0030] Preferably, the edge of the body 3a is bent upward to form a retaining ring 3d to block the sand grains rolling down from the guiding surface 3b, prevent them from spreading around and hindering the movement of the valve core 3, and ensure the stable operation of the check valve structure.

[0031] In this embodiment,

[0032] The annular seat 4 is detachably fixedly connected to the water outlet section 2. Specifically, an annular installation groove is opened on the inner wall of the water outlet section 2, and the installation groove is coaxially arranged with the water outlet section 2. A snap ring 5 matching the installation groove is arranged in the installation groove. A positioning member that is annular and coaxially arranged with the water outlet section 2 is also provided in the water outlet section 2. The outer edge of the annular seat 4 is clamped and positioned between the snap ring 5 and the positioning member. That is, at this time, both sides of the outer edge of the annular seat 4 are tightly pressed on the snap ring 5 and the positioning member. In this way, after the snap ring 5 is taken out, the annular seat 4 is in a loose state, which further facilitates cleaning and maintenance.

[0033] Among them, the structure of the limiting member is as follows: As Figure 2As shown in the figure, the positioning member includes a rubber ring 6 and an annular surface 2a formed on the inner wall of the water outlet joint 2, and both the upper and lower sides of the sealing ring are tightly pressed against the annular surface 2a and the annular seat 4 respectively. A rubber ring 6 is arranged above the outer edge of the annular seat 4, which can not only form a reliable seal between the annular seat 4 and the water outlet joint 2, but also utilize the elasticity of the rubber ring 6 to reduce the installation precision requirements of the circlip 5, facilitating processing.

[0034] The structure of the limiting member is as follows: The limiting member is a circle of retaining pieces 2b arranged on the inner wall of the water outlet joint 2, and the retaining pieces 2b are in an arc shape coaxial with the water outlet joint 2. A circle of retaining pieces 2b are circumferentially spaced along the circumference of the water inlet joint. The cross-section of the retaining piece 2b is generally in an L shape. The retaining piece 2b is composed of a horizontally arranged blocking portion 2b1 and a vertically arranged connecting portion 2b2, and the blocking portion 2b1 is above the connecting portion 2b2. The inner diameter of the connecting portion 2b2 is adapted to the outer diameter of the retaining ring 3d to ensure the stable up and down movement of the valve core 3. In the actual product, the inner diameter of the connecting portion 2b2 is slightly larger than the outer diameter of the retaining ring 3d. The valve core 3 is restricted from moving upward by pressing against the bottom wall of the blocking portion 2b1 through the top surface of the retaining ring 3d. The retaining piece 2b is used to limit the upward movement distance of the valve core 3 and also for the sliding guidance of the valve core 3. That is, in this application, the retaining piece 2b has a dual-purpose effect, simplifying the structure and facilitating assembly.

[0035] Preferably, the retaining piece 2b and the water outlet joint 2 are of an integral structure to further facilitate assembly. In the actual product, the water outlet joint 2 is made of stainless steel material. Embodiment 2

[0036] The structure and principle of this Embodiment 2 are basically the same as those of Embodiment 1. The difference is that the annular seat 4 is threadedly connected inside the water outlet joint 2.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A check valve structure for a deep well pump. The deep well pump includes a pump barrel (1) and a cylindrical water outlet section (2), and the lower end of the water outlet section (2) is fixedly arranged inside the pump barrel (1). This check valve structure includes a valve core (3) and an annular seat (4) both horizontally arranged inside the water outlet section (2). The valve core (3) includes a disc-shaped body (3a). The outer side of the annular seat (4) is fixedly and sealingly connected to the water outlet section (2). The edge of the body (3a) can press against the inner side of the annular seat (4) to close the upper port of the annular seat (4). A limiting member for restricting the upward movement distance of the body (3a) is also arranged inside the water outlet section (2). It is characterized in that, The middle position of the upper side surface of the main body (3a) is a conical flow guiding surface (3b), and the diameter of the flow guiding surface (3b) gradually increases from top to bottom; a circle of micropores (3c) vertically penetrates through the flow guiding surface (3b), and the aperture of the micropores (3c) is 1 mm to 2 mm.

2. The check structure of the deep well pump according to claim 1, wherein The edge of the above-mentioned main body (3a) is bent upward to form a retaining ring (3d).

3. The check structure for deep well pump according to claim 1 or 2, characterized in that, The lower end of the water outlet section (2) is screwed inside the upper end of the pump barrel (1); the annular seat (4) is detachably fixed to the water outlet section (2).

4. The check structure of the deep well pump according to claim 3, characterized in that An annular installation groove is formed on the inner wall of the water outlet section (2), a snap ring (5) is arranged in the installation groove, and a positioning member which is annular and coaxially arranged with the water outlet section (2) is further arranged in the water outlet section (2), and the outer edge of the annular seat (4) is clamped and positioned between the snap ring (5) and the positioning member.

5. The check structure of the deep well pump according to claim 4, characterized in that, The positioning member includes a rubber ring (6) and an annular surface (2a) formed on the inner wall of the water outlet section (2), and the upper and lower sides of the sealing ring are respectively pressed tightly against the annular surface (2a) and the annular seat (4).

6. The check structure for deep well pump according to claim 3, characterized in that The annular seat (4) is threadedly connected inside the water outlet section (2).

7. The check structure of the deep well pump according to claim 2, characterized in that, The limiting member is a circle of retaining pieces (2b) arranged on the inner wall of the water outlet section (2), and the retaining pieces (2b) are in a circular arc shape coaxial with the water outlet section (2); the cross section of the retaining piece (2b) is generally in an L shape, and the retaining piece (2b) is composed of a horizontally arranged blocking portion (2b1) and a vertically arranged connecting portion (2b2), and the blocking portion (2b1) is above the connecting portion (2b2); the inner diameter of the connecting portion (2b2) is adapted to the outer diameter of the retaining ring (3d), and the valve core (3) is restricted from moving upward by pressing against the bottom wall of the blocking portion (2b1) through the top surface of the retaining ring (3d).

8. The check valve structure for deep well pump according to claim 7, wherein The retaining piece (2b) and the water outlet section (2) are of an integral structure.

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