Sealing device for recirculation minimum flow valve of water feeding pump

Abstract

The utility model relates to a sealing device for a recirculation minimum flow valve of a water feeding pump, and aims to improve the sealing performance and the adjusting precision of the valve and reduce water seepage and damage risks through innovative design. The device comprises a main pipe and a minimum flow valve structure on one side, a water outlet hole is formed in an adjusting ball, and a sealing inner piece and a drainage hole are sleeved outside the adjusting ball. The sealing shell and the sealing rubber ring enhance the sealing effect. The adjusting rod is linked with the mechanical pressure valve to control opening and closing of the adjusting ball and adjust the flow of the drainage hole. Smooth flowing of liquid is guaranteed through the adjusting grooves and the drainage holes, and liquid impact is reduced through the L-shaped drainage holes and the hemispherical buffer grooves. The device effectively relieves mainstream pressure, reduces pressure impact on the minimum flow valve, reduces water seepage and valve damage risks, improves operation efficiency, reduces maintenance cost and prolongs service life.

Description

Technical Field

[0001] The utility model provides a sealing device, belonging to the technical field of minimum flow valves, and particularly relates to a sealing device for a minimum flow valve for a water feed pump recirculation. Background Art

[0002] The minimum flow valve for water pump recirculation is an automatic control valve. Its definition is that when the flow rate drops below a certain value during the operation of the water pump, it opens a bypass backflow to maintain the minimum flow rate of the pump, preventing the pump from cavitation, overheating, vibration and other damage to the pump body due to low flow rate, so as to ensure the normal operation of the pump and extend its service life. Structurally, this valve is usually composed of basic components such as valve body, valve cover, valve disc, valve stem and seal. The valve body and valve cover constitute the outer shell of the valve. The valve disc is the core component for controlling the flow of fluid. The valve stem connects the valve disc and transmits the operating force. The seal is used to prevent the fluid from leaking when the valve is closed. Common sealing structures include soft seals and hard seals. Soft seals are mostly made of materials such as rubber and polytetrafluoroethylene and are widely used due to their good elasticity and sealing performance. Hard seals mostly use metal-to-metal contact and are suitable for high-pressure and high-temperature working conditions to ensure the sealing and durability of the valve under extreme conditions.

[0003] Under high-flow conditions, the outlet pressure of the feed pump can increase significantly. The mechanical structure of the closed minimum flow valve may not be able to fully withstand this pressure increase. This pressure increase can increase mechanical stress in the valve structure, increasing the risk of water seepage and damage to the valve sealing surfaces. Particularly in metal-to-metal seals, high differential pressure can cause compression between the sealing surfaces due to metal-to-metal contact, leading to seal failure and valve damage. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application provide a sealing device for a minimum flow valve for water pump recirculation, thereby solving the problems of low erosion resistance and sealing performance of the existing minimum flow valve.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a water supply pump recirculation minimum flow valve sealing device, including a main pipe, a minimum flow valve is provided on one side of the main pipe, the minimum flow valve structure includes an adjusting ball placed on one side of the main pipe, a water outlet hole is provided through the adjusting ball, a sealing inner part is provided on the outer sleeve of the adjusting ball, and a leakage hole corresponding to the water outlet hole is provided on the sealing inner part.

[0006] Preferably, one side of the main pipe is correspondingly connected to a sealing shell sleeved on the outside of the sealing inner part, and a sealing rubber ring sleeved on the outside of the sealing inner part is provided in the sealing shell.

[0007] Preferably, the drain hole is placed below the regulating ball, one end of the water outlet close to the main pipe is fixedly connected to a regulating rod, and the other end of the regulating rod is connected to a mechanical pressure valve placed inside the main pipe.

[0008] Preferably, an adjusting groove corresponding to the adjusting ball is provided in the sealing inner part, and a drainage hole penetrating the sealing inner part and communicating with the adjusting groove is provided on one side of the drain hole.

[0009] Preferably, the drain hole is L-shaped as a whole, and a hemispherical buffer groove is provided at the bottom of the drain hole.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] The utility model realizes the circulation effect of liquid by setting a minimum flow valve connected to the main pipe. When the regulating ball is closed as the flow increases, part of the liquid will flow through the regulating ball from the leakage hole and eventually return to the inside of the main pipe, which is equivalent to opening a diversion in the main flow of the main pipe, relieving the pressure of the main flow, reducing the pressure on the minimum flow valve in the main pipe, and reducing the risk of water seepage and damage.

[0012] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation of a sealing device for a minimum flow valve for a water feed pump recirculation according to the present invention;

[0014] Figure 2 This is a cross-sectional view of a minimum flow valve of a sealing device for a minimum flow valve of a water feed pump recirculation system according to the present invention;

[0015] Figure 3 This is a cross-sectional view of a regulating ball of a sealing device for a minimum flow valve for a water feed pump recirculation according to the present utility model;

[0016] Figure 4 This is a cross-sectional view of the sealing inner parts of a sealing device for a minimum flow valve for a water feed pump recirculation according to the present invention.

[0017] As shown in the figure:

[0018] 1. Main pipe; 2. Minimum flow valve; 3. Adjusting ball; 4. Water outlet; 5. Sealing internals; 6. Drain hole; 7. Sealing shell; 8. Sealing rubber ring; 9. Adjusting rod; 10. Adjusting groove; 11. Drain hole; 12. Buffer groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention; the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] like Figure 1 and Figure 2 As shown, the sealing device includes a main pipe 1 with a minimum flow valve structure 2 installed on one side of the main pipe 1. The minimum flow valve structure 2 consists of an adjusting ball 3 placed on one side of the main pipe 1. The adjusting ball 3 has a water outlet hole 4 extending through it. A sealing inner member 5 is mounted on the outside of the adjusting ball 3, and the sealing inner member 5 has a drain hole 6 corresponding to the water outlet hole 4. In addition, a sealing outer shell 7 is connected to one side of the main pipe 1 and is mounted on the outside of the sealing inner member 5. The sealing outer shell 7 houses a sealing rubber ring 8 mounted on the outside of the sealing inner member 5.

[0023] In this embodiment, the present invention achieves liquid circulation by installing a minimum flow valve 2 connected to the main pipe 1. When the flow rate increases, the regulating ball 3 closes, causing some liquid to flow through the drain hole 6, through the regulating ball 3, and ultimately back into the main pipe 1. This process effectively creates a diversion within the main pipe 1, effectively alleviating pressure within the main pipe. This design reduces the pressure impact of the main pipe 1 on the minimum flow valve 2, thereby reducing the risk of water seepage and valve damage.

[0024] like Figure 3 and Figure 4As shown, the drain hole 6 is located below the regulating ball 3. An adjusting rod 9 is fixedly connected to the end of the water outlet 4 near the main pipe 1. The other end of the adjusting rod 9 is connected to a mechanical pressure valve placed inside the main pipe 1. An adjusting groove 10 corresponding to the regulating ball 3 is provided within the sealing inner component 5. A discharge hole 11 is provided on one side of the drain hole 6, penetrating the sealing inner component 5 and connecting to the adjusting groove 10. The drain hole 6 is generally L-shaped, with a hemispherical buffer groove 12 at the center. This design helps improve the valve's sealing performance and adjustment accuracy.

[0025] In this embodiment, the structural design allows the liquid to be diverted through the drain hole 6 when the regulating ball 3 is closed, thereby reducing the direct pressure impact on the minimum flow valve 2. The linkage mechanism between the regulating rod 9 and the mechanical pressure valve can accurately control the opening and closing state of the regulating ball 3, and then adjust the flow of the drain hole 6 to achieve precise control of the minimum recirculation flow of the water pump. The setting of the regulating groove 10 and the drainage hole 11 ensures that the liquid flows more smoothly between the regulating ball 3 and the sealing inner part 5, while the design of the hemispherical buffer groove 12 provides a buffer area at the outlet of the drain hole 6, reducing the impact of the liquid on the internal structure of the valve and enhancing the durability and sealing of the valve. This comprehensive design not only improves the operating efficiency of the valve, but also reduces maintenance costs and extends the service life of the valve.

[0026] When in use, first install the device on the main pipe 1, ensure that the minimum flow valve structure 2 is connected to the main pipe 1, wherein the regulating ball 3 is placed on one side of the main pipe 1 and communicates with the inside of the main pipe 1 through the water outlet 4; then, the sealing inner part 5 is sleeved on the outside of the regulating ball 3, and ensure that the leakage hole 6 corresponds to the water outlet 4, so that when the regulating ball 3 is closed, the liquid can be diverted through the leakage hole 6; then, the sealing shell 7 is sleeved on the outside of the sealing inner part 5, and a sealing rubber ring 8 is installed in the sealing shell 7 to enhance the sealing effect; when the flow increases and causes the regulating ball 3 to close, part of the liquid will flow through the leakage hole 6 through the regulating ball 3 and finally flow back to the inside of the main pipe 1, thereby achieving Liquid circulation is realized and mainstream pressure is relieved; at the same time, the regulating rod 9 is linked with the mechanical pressure valve to accurately control the opening and closing state of the regulating ball 3, adjust the flow of the leakage hole 6, and realize precise control of the minimum recirculation flow of the water pump; in addition, an adjusting groove 10 and a drainage hole 11 are provided in the sealing inner part 5 to ensure that the liquid flows smoothly between the regulating ball 3 and the sealing inner part 5, and the L-shaped design of the leakage hole 6 and the hemispherical buffer groove 12 provide a buffer area at the outlet, which reduces the impact of the liquid on the internal structure of the valve, enhances the durability and sealing of the valve, thereby improving the operating efficiency of the valve during operation, reducing maintenance costs, and extending the service life of the valve.

[0027] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A sealing device for a minimum flow valve of a water supply pump recirculation, comprising a main pipe (1), characterized in that: A minimum flow valve (2) is provided on one side of the main pipe (1), and the minimum flow valve (2) includes a regulating ball (3) placed on one side of the main pipe (1), a water outlet hole (4) penetrating the regulating ball (3), and a sealing inner part (5) is provided on the outer surface of the regulating ball (3), and a leakage hole (6) corresponding to the water outlet hole (4) is provided on the sealing inner part (5).

2. A sealing device for a minimum flow valve for a water supply pump recirculation according to claim 1, characterized in that: One side of the main pipe (1) is correspondingly connected to a sealing shell (7) sleeved on the outside of the sealing inner part (5), and a sealing rubber ring (8) sleeved on the outside of the sealing inner part (5) is provided in the sealing shell (7).

3. A sealing device for a minimum flow valve for a water supply pump recirculation according to claim 1, characterized in that: The drain hole (6) is placed below the regulating ball (3); one end of the water outlet hole (4) close to the main pipe (1) is fixedly connected to a regulating rod (9); the other end of the regulating rod (9) is connected to a mechanical pressure valve placed inside the main pipe (1).

4. A sealing device for a minimum flow valve for a water supply pump recirculation according to claim 1, characterized in that: The sealing inner part (5) is provided with an adjustment groove (10) corresponding to the adjustment ball (3), and one side of the leakage hole (6) is provided with a discharge hole (11) that penetrates the sealing inner part (5) and communicates with the adjustment groove (10).

5. The sealing device for a minimum flow valve for a water supply pump recirculation according to claim 1, characterized in that: The leakage hole (6) is L-shaped as a whole, and a hemispherical buffer groove (12) is provided at the side of the leakage hole (6).

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