Non-return device of pipeline pump

Abstract

A non-return device of a pipeline pump comprises a water outlet section and a water outlet pipe, a piston and a guide ring are arranged in the water outlet pipe, the guide ring is fixedly connected to the water outlet pipe, a piston rod penetrates through the guide ring, the end face of the piston is a circular truncated cone, a chamfer is arranged at the outer end of a water outlet hole of the water outlet section, the piston rod is sleeved with a spring, and the two ends of the spring abut against the guide ring and the piston respectively. Existing parts of the pipeline pump are utilized, the structure is simplified, and manufacturing cost is reduced; one piston and one spring are used for sealing the water outlet hole, the installation is very fast and convenient, and the installation difficulty is reduced; the sealing surface is formed by the circular truncated cone of the piston and the chamfer of the water outlet hole, so that the sealing surface is not invalid no matter how high the water pressure is, and the safety and reliability are extremely high, the service life is longer, and the use cost is lower; due to the fact that the sealing face is the inclined face, a small amount of fine silt mixed in water flow is difficult to stay on the sealing face, and safety and reliability of the non-return function are improved from another angle.

Description

Technical Field

[0001] The utility model relates to the field of liquid conveying devices, in particular to a non-return device of a pipeline pump. Background Art

[0002] The pipeline pump is named pipeline pump because its inlet and outlet are in the same straight line and the inlet and outlet diameter are the same, just like a section of pipeline, and can be installed at any position of the pipeline. A check valve is a valve that automatically opens and closes by the flow of the medium itself, and is used to block the backflow of the medium.

[0003] Existing technologies include the utility model patent with announcement number CN211009129U authorized and announced by the State Intellectual Property Office on July 14, 2020. The name of the patent is "A pipeline pump". The technical solution of the patent includes an outer cylinder, and a first end cover and a second end cover are respectively installed at both ends of the outer cylinder, and a water inlet and a water outlet are respectively provided on the first end cover and the second end cover; a stator seat is provided in the outer cylinder, a stator is installed on the stator seat, a rotor is provided outside the stator, a motor shaft is installed in the stator seat, one end of the motor shaft is connected to the rotor, and the other end of the motor shaft is connected to an impeller close to the water inlet, a guide wheel is provided outside the impeller, and a motor cover wrapping the rotor is installed on the stator seat; a bracket for supporting the motor cover is provided in the outer cylinder near the water outlet, the bracket has a plurality of first water holes, a sealing gasket corresponding to the first water holes is installed in the bracket, a plurality of guide columns passing through the sealing gaskets are provided in the bracket, and a spring for pressing the sealing gaskets is mounted on the guide columns. The technical solution of this patent closes the first water hole by compressing the sealing gasket through several springs sleeved on the guide column. Since the guide column passes through the sealing ring and the spacing between adjacent guide columns is large, and the sealing gasket is made of flexible material, when the water pressure is slightly large, the sealing gasket will inevitably be pressed into the first water hole, thereby losing the sealing performance. Therefore, the safety of the check valve of this technical solution is poor and it is very easy to be damaged. In addition, in the technical solution of this patent, several first water holes are opened on the annular bracket, and the shape of the first water holes is a long curved hole extending in an arc shape, and several springs are sleeved on the outer peripheral side of the guide column, which makes its manufacturing cost high, the installation structure is relatively complex, the installation is difficult, and the use cost is high. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the technical problem that the utility model needs to solve is: to provide a check device for a pipeline pump, to make full use of the existing parts of the pipeline pump, to simplify the structure of the check valve function, to reduce the manufacturing cost and installation difficulty of the check valve, to improve the safety and reliability of the check valve, to extend the service life of the check valve, and to reduce the cost of use.

[0005] In order to solve the technical problem, the technical solution of the utility model is: a non-return device of a pipeline pump, which includes a pump body, a motor and a water outlet are arranged in the pump body, a water outlet joint is arranged on the side of the motor facing the water outlet, a water outlet pipe is arranged in the water outlet, the water outlet pipe is sealed and connected with the water outlet joint, a piston and a guide ring are arranged in the water outlet pipe, the guide ring is fixedly connected to the inner side wall of the water outlet pipe, the piston rod of the piston passes through the guide ring with a gap, the end face of the piston facing the water outlet joint is a cone, the outer end of the water outlet hole of the water outlet joint is provided with a chamfer matching the piston cone, the guide ring, the piston and the water outlet are coaxially arranged, a spring is gap-mounted on the piston rod, and the two ends of the spring respectively abut against the guide ring and the piston. The technical solution utilizes the existing water outlet joint of the pipeline pump, and the water outlet pipe is used as a component of the check device, which can simplify the structure of the check valve function and reduce the manufacturing cost of the check valve; the technical solution utilizes a piston and a spring to seal the only water outlet hole of the water outlet joint, so that the installation of the check device can be completed by simply sleeved a spring on the piston rod and placed in a guide ring, and then connecting the water outlet joint and the water outlet pipe, which is very quick and convenient, and the installation difficulty is extremely low; because the technical solution adopts the truncated cone structure of the piston and the chamfered structure of the water outlet hole to form a sealing surface, no matter how high the water pressure is, it will not cause the sealing surface to fail, and has extremely high safety and reliability, a long service life and a low cost of use; and because the sealing surface of the technical solution is an inclined surface, driven by the water flow, a small amount of fine sediment mixed in the water flow is difficult to stay on the sealing surface, and the safety and reliability of the check function is also improved from another angle.

[0006] As a further technical solution, the outer surface of the piston is sleeved with a piston sleeve, so that if the sealing surface of the piston fails for a long time, it can be restored to be as good as new by replacing the piston sleeve, which is conducive to extending the service life of the non-return device and reducing the use cost.

[0007] As a further technical solution, the piston sleeve is formed by directly injecting a flexible material onto the outer surface of the piston. The piston sleeve is made of a flexible material, so that even if a small defect occurs on the sealing surface, it can be compensated by the deformation of the flexible material, ensuring that the sealing performance of the sealing surface is continuously effective, thereby extending the service life of the check device and reducing the cost of use; the piston sleeve is directly formed by injection molding on the piston, which is conducive to improving the tightness of the fit between the piston and the piston sleeve and the consistency of related structural parameters, and can prevent the hidden dangers of the piston sleeve falling off and the reduction of sealing performance.

[0008] As a further technical solution, the guide ring is connected to the water outlet pipe through a plurality of spokes, which is conducive to the stable connection of the guide ring and the function of the gaps between the spokes for water flow.

[0009] As a further technical solution, the guide ring is connected to the water outlet pipe by four spokes arranged in a cross shape.

[0010] As a further technical solution, the water outlet node is connected to the water outlet pipe via a sealing ring.

[0011] The beneficial effects of the utility model are as follows: since the existing water outlet section of the pipeline pump is utilized and the water outlet pipe is used as a component of the non-return device, the structure of the non-return valve function can be simplified and the manufacturing cost of the non-return valve can be reduced; since a piston and a spring are utilized to seal the only water outlet hole of the water outlet section, the installation of the non-return device can be completed by simply sleeved a spring on the piston rod and placed in a guide ring, and then connecting the water outlet section and the water outlet pipe, which is very quick and convenient and has an extremely low installation difficulty; since the sealing surface is composed of the truncated cone structure of the piston and the chamfered structure of the water outlet hole, the sealing surface will not fail no matter how high the water pressure is, and the utility model has extremely high safety and reliability, a long service life and a low cost of use; and since the sealing surface of the technical solution is an inclined surface, a small amount of fine sediment mixed in the water flow is difficult to stay on the sealing surface under the drive of the water flow, and the safety and reliability of the non-return function is also improved from another perspective. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural cross-sectional schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 The R part is enlarged in the figure;

[0014] Figure 3 It is a three-dimensional schematic diagram of the water outlet pipe in the utility model;

[0015] Figure 4 It is a three-dimensional schematic diagram of the water outlet section in the utility model;

[0016] Figure 5 It is a three-dimensional schematic diagram of the piston in the utility model;

[0017] Figure 6 It is a partial cross-sectional schematic diagram of the piston in the utility model.

[0018] In the figure: 1. pump body; 2. motor; 3. water outlet; 4. water outlet pipe; 5. water outlet section; 6. water outlet hole; 7. chamfer; 8. sealing ring; 9. spring; 10. spoke; 11. guide ring; 12. piston rod; 13. piston sleeve; 14. piston. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described in detail below through preferred embodiments and in conjunction with the accompanying drawings of the specification:

[0020] Embodiment: A non-return device for a pipeline pump, as shown in the figure, comprises a pump body 1, wherein a motor 2 and a water outlet 3 are arranged in the pump body 1, a water outlet section 5 is arranged on the side of the motor 2 facing the water outlet 3, a water outlet pipe 4 is arranged in the water outlet 3, the water outlet pipe 4 is sealedly connected to the water outlet section 5 through a sealing ring 8, a piston 14 and a guide ring 11 are arranged in the water outlet pipe 4, the outer surface of the piston 14 is directly injection-molded by a flexible material to form a piston sleeve 13 of equal thickness, the guide ring 11 is connected to the water outlet pipe 4 through four spokes 10 The inner wall of the piston 14 is connected as a whole, the four spokes 10 are arranged in a cross shape, the piston rod 12 of the piston 14 passes through the guide ring 11 with a gap, the end face of the piston sleeve 13 facing the water outlet node 5 is a cone, and the outer end of the water outlet hole 6 of the water outlet node 5 is provided with a chamfer 7 matching the side of the cone of the piston sleeve 13, the guide ring 11, the piston 14, and the water outlet hole 6 are coaxially arranged, and a spring 9 is gap-mounted on the piston rod 12, and the two ends of the spring 9 are respectively abutted against the guide ring 11 and the piston 14.

[0021] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

[0022] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A non-return device for a pipeline pump, comprising a pump body, a motor and a water outlet are arranged in the pump body, a water outlet section is arranged on the side of the motor facing the water outlet, a water outlet pipe is arranged in the water outlet, and the water outlet pipe is sealed and connected to the water outlet section, characterized in that: A piston and a guide ring are provided in the water outlet pipe. The guide ring is fixedly connected to the inner wall of the water outlet pipe. The piston rod of the piston passes through the guide ring with a gap. The end face of the piston facing the water outlet joint is a cone. The outer end of the water outlet hole of the water outlet joint is provided with a chamfer matching the piston cone. The guide ring, the piston and the water outlet hole are coaxially arranged. A spring is gap-mounted on the piston rod, and the two ends of the spring respectively abut against the guide ring and the piston.

2. The pipeline pump non-return device according to claim 1, characterized in that: The outer surface of the piston is sleeved with a piston sleeve.

3. The pipeline pump non-return device according to claim 2, characterized in that: The piston sleeve is formed by directly injecting a flexible material onto the outer surface of the piston.

4. The pipeline pump non-return device according to claim 1, 2 or 3, characterized in that: The guide ring is connected to the water outlet pipe through a plurality of spokes.

5. The pipeline pump non-return device according to claim 4, characterized in that: The guide ring is connected to the water outlet pipe by four spokes arranged in a cross shape.

6. The pipeline pump non-return device according to claim 1, characterized in that: The water outlet node is connected to the water outlet pipe through a sealing ring.

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