Novel structure of overflow valve of high-pressure cleaning machine

Abstract

The utility model discloses a novel structure of an overflow valve of a high-pressure cleaning machine, which comprises a valve sleeve, a valve body and a valve core, the valve core is arranged in a valve cavity formed by connecting the valve sleeve and the valve body and can axially slide along the valve core, the front end of the valve core is provided with a sealing column arranged along the axial direction, the sealing column is cylindrical, the sealing column is provided with a special-shaped sealing ring, and the special-shaped sealing ring is fixedly connected with the valve sleeve. The special-shaped sealing ring comprises an inner ring and an outer ring, a supporting ring is embedded between the outer ring and the inner ring, the inner ring is arranged to be of an O-shaped ring structure, the O-shaped ring structure is tightly attached to the matching face of the sealing column, the outer ring is arranged to be of a cylindrical face structure, the cylindrical face structure surrounds and is formed on the periphery of the inner ring, and the cylindrical face structure is tightly attached to the cylindrical face of an inner hole of the valve sleeve. By means of the mode, the novel structure of the overflow valve of the high-pressure cleaning machine solves the problem that an O-shaped ring in an existing scheme loses efficacy, the consistency of backflushing pressure is improved, and reliable work of the overflow valve and normal operation of the cleaning machine are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow valves, in particular to a new structure of an overflow valve for a high-pressure cleaning machine. Background Art

[0002] The overflow valve is an important component of the high-pressure cleaning machine, and its main function is safety protection. When the pipeline pressure exceeds the pressure value set by the overflow port, the overflow port automatically opens, thereby playing a safety protection role.

[0003] When a high-pressure cleaner is operating, the sealing ring between the valve stem and the valve sleeve is a conventional O-ring. This relief valve O-ring cooperates with the valve core to provide a seal when the cleaner is operating normally. When the gun is turned off, the water has nowhere to drain, creating a backwash and rapidly increasing pressure. This backwash pressure overcomes the spring force and friction, pushing the valve core outward and overcoming these forces. After the valve core disengages the relief valve O-ring, high-pressure water flows from the high-pressure chamber of the pump body and other locations into the chamber where the spring is located. This chamber has a small hole that connects to the low-pressure water inlet area.

[0004] Therefore, high-pressure water flows from the high-pressure area to the low-pressure area. After the pressure difference on both sides of the valve core decreases, the valve core moves downward under the action of the spring force, and the O-ring matching the valve core and the valve sleeve is re-sealed to complete the overflow process.

[0005] However, the overflow valve with the above structure may encounter a series of potential problems during use:

[0006] Since the sealing ring at the matching position of the valve stem and the valve sleeve is a conventional O-ring, when this type of O-ring encounters an extremely high temperature environment (for example, the water inlet temperature is above 40 degrees Celsius), the tensile strength and hardness will decrease, and the deformation resistance will drop sharply. As a result, the inner ring of the O-ring loses support at the moment the O-ring is detached from the valve stem. High-pressure water may squeeze the O-ring into the small hole of the valve sleeve, causing the overflow valve to fail and the cleaning machine to not work properly. Utility Model Content

[0007] The main technical problem solved by the utility model is to provide a new structure of a high-pressure cleaning machine overflow valve, which can maintain high tensile strength, hardness and deformation resistance in an extremely high temperature environment, solve the O-ring failure problem in the existing solution, improve the consistency of the recoil pressure, ensure the reliable operation of the overflow valve and the normal operation of the cleaning machine, reduce the failure rate of the cleaning machine, and increase its service life.

[0008] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a new structure of a high-pressure cleaning machine overflow valve, including: a valve sleeve, a valve body and a valve core, the valve sleeve is connected to the valve body, the valve sleeve and the valve body form a valve cavity, the valve core is arranged in the valve cavity and can slide axially along itself, the front end of the valve core has an axially arranged sealing column, the sealing column is set in a cylindrical shape, and a special-shaped sealing ring is provided on the sealing column, the special-shaped sealing ring includes an inner ring and an outer ring, and a support ring is embedded between the outer ring and the inner ring.

[0009] The inner ring is configured as an O-ring structure, which fits tightly with the mating surface of the sealing column; the outer ring is configured as a cylindrical surface structure, which surrounds and is formed on the periphery of the inner ring, and fits tightly with the inner hole cylindrical surface of the valve sleeve.

[0010] In a preferred embodiment of the present invention, a concave cavity is formed between the outer ring and the inner ring, and the concave cavity extends axially along the special-shaped sealing ring. The support ring is configured to fit tightly on both side walls of the concave cavity.

[0011] In a preferred embodiment of the present invention, the support ring is a copper support ring.

[0012] In a preferred embodiment of the present invention, the special-shaped sealing ring is a fluororubber sealing ring.

[0013] In a preferred embodiment of the present invention, a sealing ring gasket is further provided between the special-shaped sealing ring and the inner cylindrical surface of the valve sleeve.

[0014] In a preferred embodiment of the present invention, a spring is sleeved on the valve core. The spring extends along the axial direction of the valve core. One side of the spring contacts the outer surface of the valve core, and the other side of the spring contacts the inner wall of the valve body.

[0015] In a preferred embodiment of the present invention, a limiting ring is provided between the front end of the spring and the valve core, and a gasket is provided between the rear end of the spring and the valve body and the valve core.

[0016] In a preferred embodiment of the present invention, a first O-ring is provided between the front end of the valve body and the valve sleeve, forming a cylindrical sealing structure between the front end of the valve body and the valve sleeve; a second O-ring is provided between the rear end of the valve body and the valve core, forming a cylindrical sealing structure between the rear end of the valve body and the valve core.

[0017] The beneficial effects of the present invention are as follows: a new type of special-shaped sealing ring is adopted, the inner ring structure is an O-ring structure, which can ensure the sealing effect of the O-ring, and the outer ring is a cylindrical surface, which can also increase the matching area with the inner hole cylindrical surface of the valve sleeve, and the matching is tight, not easy to move axially, and the consistency of the recoil pressure is also improved. At the same time, the special-shaped sealing ring is supported by a copper ring, and the strength and deformation resistance are greatly improved than the O-ring, which solves the risk of the O-ring being squeezed out, avoids the failure of the overflow valve, and ensures the normal operation of the cleaning machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0019] Figure 1 This is a schematic structural diagram of a preferred embodiment of a new structure of a high-pressure cleaning machine overflow valve of the utility model;

[0020] Figure 2 This is a structural diagram of a preferred embodiment of the special-shaped sealing ring of the present invention;

[0021] Figure 3 This is a cross-sectional view of a preferred embodiment of the special-shaped sealing ring of the present invention;

[0022] The markings of the components in the accompanying drawings are as follows:

[0023] 1. Valve sleeve, 2. Valve cavity, 3. Special-shaped sealing ring, 31. Inner ring, 32. Outer ring, 33. Support ring, 34. Concave cavity, 4. Sealing ring gasket, 5. Valve core, 6. First O-ring, 7. Limit ring, 8. Spring, 9. Gasket, 10. Second O-ring, 11. Valve body. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0026] The utility model relates to a preferred embodiment of a new structure of an overflow valve of a high-pressure cleaning machine.

[0027] See also Figure 1-3 The new structure of the high-pressure cleaning machine overflow valve includes: a valve sleeve 1, a valve body 11 and a valve core 5. The valve sleeve 1 is connected to the valve body 11. A valve cavity 2 is formed inside the valve sleeve 1 and the valve body 11. The valve core 5 is arranged in the valve cavity 2 and can slide axially along itself.

[0028] A spring 8 is sleeved on the valve core 5, and the spring 8 extends along the axial direction of the valve core 5. One side of the spring 8 contacts the outer surface of the valve core 5, and the other side of the spring 8 contacts the inner wall surface of the valve body 11. Through the elastic force of the spring 8, a stable and adjustable preload or reset force is provided for the valve core 5.

[0029] In an exemplary embodiment, the front end of the valve core 5 has a sealing column 12 arranged axially, and the sealing column 12 is arranged in a cylindrical shape. A special-shaped sealing ring 3 is provided on the sealing column 12, and the special-shaped sealing ring 3 includes an inner ring 31 and an outer ring 32, and a support ring 33 is embedded between the outer ring 32 and the inner ring 31.

[0030] Specifically, first, the inner ring 31 is configured as an O-ring structure, which fits tightly with the mating surface of the sealing column to ensure the integrity of the seal and prevent liquid leakage.

[0031] Secondly, the outer ring 32 is configured as a cylindrical surface structure, which surrounds and is formed on the periphery of the inner ring 31 so that the special-shaped sealing ring 3 forms a stable and strong sealing ring as a whole. The cylindrical surface structure of the outer ring 32 fits tightly with the inner cylindrical surface of the valve sleeve 1:

[0032] By increasing the contact area between the outer ring 32 and the inner hole wall of the valve sleeve, the sealing effect is further enhanced, the axial movement of the special-shaped sealing ring 3 is effectively prevented, the consistency of the backwash pressure is improved, and a stable sealing relationship between the valve core 5 and the valve sleeve 1 is ensured.

[0033] Then, a concave cavity 34 is formed between the outer ring 32 and the inner ring 31 . The concave cavity 34 extends axially along the special-shaped sealing ring. The support ring 33 is configured to fit tightly on both side walls of the concave cavity 34 .

[0034] Furthermore, the support ring 33 is a copper support ring: compared with the traditional O-ring, the copper support ring has greatly improved strength and deformation resistance. This improvement solves the risk of the O-ring being squeezed out of the fitting gap due to loss of support when encountering an extremely high temperature environment, ensuring a more durable and efficient sealing of the overflow valve.

[0035] Furthermore, the special-shaped sealing ring 3 is a fluororubber sealing ring, which can maintain stable sealing performance in extreme working environments and ensure good sealing between it, the valve core and the valve sleeve.

[0036] The inner ring 31 of the special-shaped sealing ring 3 of the present invention is an O-ring structure, which can ensure the sealing effect of the O-ring. The outer ring 32 is a cylindrical surface, which can also increase the matching area with the inner hole cylindrical surface of the valve sleeve 1, and the matching is tight, not easy to move axially, and the consistency of the recoil pressure is also improved. At the same time, the special-shaped sealing ring is supported by a copper ring, and its strength and deformation resistance are greatly improved than that of the O-ring, which solves the risk of the O-ring being squeezed out, avoids the failure of the overflow valve, and ensures the normal operation of the cleaning machine.

[0037] A sealing ring gasket 4 is also provided between the special-shaped sealing ring 3 and the inner cylindrical surface of the valve sleeve 1. The sealing ring gasket 4 ensures that it can fit tightly between the special-shaped sealing ring 3 and the valve sleeve 1 to form a reliable sealing barrier to further enhance the sealing effect and reduce the risk of leakage.

[0038] In the present invention, a limiting ring 7 is provided between the front end of the spring 8 and the valve core 5. The presence of the limiting ring 7 ensures that the spring 8 does not excessively move during the compression process.

[0039] A gasket 9 is provided between the rear end of the spring 8 and the valve body 11 and the valve core 5. The gasket 9 not only enhances the sealing effect between the rear end of the spring 8 and the valve body 11 and the valve core 5 to prevent liquid leakage, but also absorbs part of the impact force at the moment when the overflow valve is opened or closed, reduces the collision noise between the valve core and the valve body, and protects the valve core and the valve body from damage.

[0040] Furthermore, a first O-ring 6 is provided between the front end of the valve body 11 and the valve sleeve 1, forming a cylindrical sealing structure between the front end of the valve body 11 and the valve sleeve 1;

[0041] A second O-ring 10 is provided between the rear end of the valve body 11 and the valve core 5, forming a cylindrical sealing structure between the rear end of the valve body 11 and the valve core 5, thereby improving the sealing reliability. The cylindrical sealing structure effectively disperses the pressure on the sealing surface and reduces the risk of sealing failure due to pressure concentration.

[0042] The beneficial effects of the new structure of the high-pressure cleaning machine overflow valve of the utility model are:

[0043] The special-shaped sealing ring can maintain high tensile strength, hardness and deformation resistance in extremely high temperature environments, effectively preventing the inner ring from being squeezed into the fitting gap by high-pressure water due to loss of support, solving the O-ring failure problem in existing solutions, improving the consistency of recoil pressure, and ensuring the reliable operation of the overflow valve and the normal operation of the cleaning machine.

[0044] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new structure of a high-pressure cleaning machine overflow valve, comprising: The valve sleeve, valve body and valve core, the valve sleeve is connected to the valve body, the valve sleeve and the valve body form a valve cavity, the valve core is arranged in the valve cavity and can slide axially along itself, characterized in that: The front end of the valve core has a sealing column arranged in the axial direction. The sealing column is set in a cylindrical shape. A special-shaped sealing ring is set on the sealing column. The special-shaped sealing ring includes an inner ring and an outer ring. A support ring is embedded between the outer ring and the inner ring. The inner ring is configured as an O-ring structure, which fits tightly with the mating surface of the sealing column; the outer ring is configured as a cylindrical surface structure, which surrounds and is formed on the periphery of the inner ring, and fits tightly with the inner hole cylindrical surface of the valve sleeve.

2. The novel structure of the overflow valve of a high-pressure cleaning machine according to claim 1 is characterized in that: A concave cavity is formed between the outer ring and the inner ring. The concave cavity extends axially along the special-shaped sealing ring. The support ring is configured to fit tightly on both side walls of the concave cavity.

3. The novel structure of the overflow valve of the high-pressure cleaning machine according to claim 2 is characterized in that: The support ring is a copper support ring.

4. The novel structure of the overflow valve of a high-pressure cleaning machine according to claim 1 is characterized in that: The special-shaped sealing ring is a fluororubber sealing ring.

5. The novel structure of the overflow valve of a high-pressure cleaning machine according to claim 1 is characterized in that: A sealing ring gasket is also provided between the special-shaped sealing ring and the inner cylindrical surface of the valve sleeve.

6. The novel structure of the overflow valve of a high-pressure cleaning machine according to claim 1 is characterized in that: A spring is sleeved on the valve core and extends along the axial direction of the valve core. One side of the spring contacts the outer surface of the valve core, and the other side of the spring contacts the inner wall surface of the valve body.

7. The novel structure of the overflow valve of a high-pressure cleaning machine according to claim 6 is characterized in that: A limiting ring is provided between the front end of the spring and the valve core, and a gasket is provided between the rear end of the spring, the valve body and the valve core.

8. The novel structure of the overflow valve of a high-pressure cleaning machine according to claim 1 is characterized in that: A first O-ring is provided between the front end of the valve body and the valve sleeve, forming a cylindrical sealing structure between the front end of the valve body and the valve sleeve; a second O-ring is provided between the rear end of the valve body and the valve core, forming a cylindrical sealing structure between the rear end of the valve body and the valve core.

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