Novel combined valve sleeve

Abstract

The utility model belongs to the technical field of valve bushes and discloses a novel combined valve bush which comprises a shell, a pressure chamber, a piston, an oil inlet valve plate and an oil outlet valve plate, the piston comprises a piston rod and a piston bush, the piston rod is slidably connected into a guide sealing hole, and a sealing face is arranged on the end face of the piston bush and is in close contact with the lower end face of the oil inlet valve plate. An oil inlet and an oil passing hole are further formed in a shaft shoulder step of the piston sleeve, two positioning pin holes are formed in the piston sleeve, an oil outlet hole and the oil inlet hole are formed in the oil outlet valve plate and the oil inlet valve plate respectively, and the flow coefficient can be adjusted by replacing the oil inlet valve plate or the oil outlet valve plate; at the contact position of a sealing seat surface of an existing structure and a steel ball, due to high-speed and high-frequency knocking of the steel ball, the sealing seat surface is prone to abrasion, the sealing capacity is reduced, and the whole valve sleeve needs to be replaced regularly. According to the structure, only the oil outlet valve plate needs to be replaced, the oil inlet hole and the piston hole can be continuously used, and waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve sleeve technical field, concretely relates to a novel combined valve sleeve. BACKGROUND

[0002] The valve sleeve is a material or component for valve sealing, usually made of rubber, plastic or metal, which mainly prevents the valve from leaking air, oil or water, thereby ensuring the normal operation and service life of the valve.

[0003] At present, the existing combined valve sleeve structure is complex, the fuel flow of the oil inlet hole and the oil outlet hole has a proportional relationship, which is called flow coefficient, the flow coefficient of the existing structure has been set during processing, and cannot be adjusted, thereby reducing the use effect, therefore, the novel combined valve sleeve is provided. CONTENT OF UTILITY MODEL

[0004] The utility model discloses a novel combined valve sleeve, which solves the problems of the existing combined valve sleeve structure being complex, the fuel flow of the oil inlet hole and the oil outlet hole having a proportional relationship, which is called flow coefficient, the flow coefficient of the existing structure being set during processing and being unable to be adjusted, and the use effect being reduced.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a novel combined valve sleeve, which comprises a shell, a pressure chamber, a piston, an oil inlet valve plate and an oil outlet valve plate, the piston comprises a piston rod and a piston sleeve, the shell is internally provided with the pressure chamber, the pressure chamber is internally provided with a guide hole, the lower portion of the guide hole is provided with a guide sealing hole, the piston rod is slidably connected in the guide sealing hole, the end surface of the piston sleeve is provided with a sealing surface, which is in close contact with the lower end surface of the oil inlet valve plate, the piston sleeve is also provided with an oil inlet hole and an oil passing hole at the shoulder step, and the piston sleeve is provided with two positioning pin holes.

[0006] Preferably, the upper and lower end surfaces of the oil inlet valve plate are both sealing surfaces, the upper end surface is in close contact with the lower end surface of the oil outlet valve plate, the lower end surface is in close contact with the end surface of the piston sleeve, the oil inlet valve plate is also provided with an oil inlet hole and an oil guide groove, and the oil inlet valve plate is also provided with two positioning pin holes.

[0007] Preferably, the lower end surface of the oil outlet valve plate is a sealing surface, the lower end surface of the oil outlet valve plate is in close contact with the upper end surface of the oil inlet valve plate, the oil outlet valve plate is also provided with two positioning pin holes, the oil outlet valve plate is also provided with a conical surface, an oil outlet hole and a sealing seat surface, the top of the sealing seat surface is provided with a steel ball, the sealing seat surface is in contact with the steel ball, and the upper portion of the steel ball is provided with a spring seat and a spring.

[0008] Compared with the prior art, the utility model has the advantages of:

[0009] 1. The oil outlet and oil inlet are located on the oil outlet valve plate and oil inlet valve plate respectively. The flow coefficient can be adjusted by replacing either the oil inlet valve plate or the oil outlet valve plate. In the existing structure, the sealing surface at the contact point with the steel ball is prone to wear due to the high-speed, high-frequency impact of the steel ball, resulting in a decrease in sealing capacity. This requires periodic replacement of the entire valve sleeve. This structure only requires replacing the oil outlet valve plate, while the oil inlet and piston hole can continue to be used, reducing waste. Similarly, if the inner bore of the piston sleeve wears, only the piston sleeve needs to be replaced, without replacing the entire valve.

[0010] 2. During the processing, the split structure facilitates machining. If a single structure is defective, it will not affect the use of other structures. The piston sleeve is changed from a blind hole structure to a through hole structure, which makes machining easier and reduces the process capability of the equipment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the internal structure of the shell of this utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of the piston sleeve of this utility model;

[0013] Figure 3 This is a schematic diagram of the pressure chamber structure of this utility model;

[0014] Figure 4 This is a schematic diagram of the piston structure of this utility model;

[0015] Figure 5 This is a cross-sectional view of the piston sleeve of this utility model;

[0016] Figure 6 This is a cross-sectional view of the oil inlet valve plate of this utility model;

[0017] Figure 7 This is a cross-sectional view of the oil outlet valve plate of this utility model.

[0018] In the diagram: 1. Housing; 2. Locating pin hole; 3. Piston; 4. Inlet valve plate; 5. Outlet valve plate; 6. Piston rod; 7. Piston sleeve; 8. Pressure chamber; 9. Guide hole; 10. Guide sealing hole; 11. Oil inlet; 12. Oil passage hole; 13. Oil inlet; 14. Oil guide groove; 15. Conical surface; 16. Outlet hole; 17. Sealing seat surface; 18. Steel ball. Detailed Implementation

[0019] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0020] Please refer to Figures 1-7 The present application provides a novel combined valve sleeve technical scheme, which comprises a shell 1, a pressure chamber 8, a piston 3, an oil inlet valve plate 4 and an oil outlet valve plate 5. The piston 3 comprises a piston rod 6 and a piston sleeve 7. The shell 1 is internally provided with the pressure chamber 8. The pressure chamber 8 is internally provided with a guide hole 9. The guide hole 9 is provided below with a guide sealing hole 10. The piston rod 6 is slidingly connected inside the guide sealing hole 10. The piston sleeve 7 is provided at an end face with a sealing surface, which is in close contact with a lower end face of the oil inlet valve plate 4. The piston sleeve 7 is further provided at an axial shoulder step with an oil inlet port 11 and an oil passing hole 12. The piston sleeve 7 is provided with two locating pin holes 2.

[0021] Specifically, the upper and lower end faces of the oil inlet valve plate 4 are both sealing surfaces. The upper end face is in close contact with a lower end face of the oil outlet valve plate 5, and the lower end face is in close contact with an end face of the piston sleeve 7. The oil inlet valve plate 4 is further provided with an oil inlet hole 13 and an oil guide groove 14. The oil inlet valve plate 4 is also provided with two locating pin holes 2.

[0022] Specifically, the lower end face of the oil outlet valve plate 5 is a sealing surface. The lower end face of the oil outlet valve plate 5 is in close contact with the upper end face of the oil inlet valve plate 4. The oil outlet valve plate 5 is further provided with two locating pin holes 2. The oil outlet valve plate 5 is further provided with a conical surface 15, an oil outlet hole 16 and a sealing seat surface 17. The top of the sealing seat surface 17 is provided with a steel ball 18. The sealing seat surface 17 is in contact with the steel ball 18. The steel ball 18 is provided above with a spring seat and a spring.

[0023] In this embodiment, the piston rod 6 and the piston sleeve 7 form the piston 3, which realizes up and down movement under the action of pressure accumulation and pressure relief of the pressure chamber 8. The piston rod 6 and the piston sleeve 7 cooperate with the guide sealing hole 10 to realize radial sealing and guiding when the piston rod 6 slides up and down. The end face is provided with a sealing surface, which is in close contact with the lower end face of the oil inlet valve plate 4 to realize mechanical sealing. The shaft shoulder step is provided with a sealing surface, which is in close contact with the shell 1 to realize mechanical sealing. The upper and lower end faces of the oil inlet valve plate 4 are both sealing surfaces. The upper end face is in close contact with the lower end face of the oil outlet valve plate 5 to realize mechanical sealing. The lower end face is in close contact with the end face of the piston sleeve 7 to realize mechanical sealing. The oil inlet valve plate 4 is also provided with an oil inlet hole 13 and an oil guide groove 14, which are responsible for delivering high-pressure oil to the pressure chamber 8. The lower end face of the oil outlet valve plate 5 is a sealing surface, which is in close contact with the upper end face of the oil inlet valve plate 4 to realize mechanical sealing. The oil outlet valve plate 4, the oil inlet valve plate 5, the piston sleeve 7 and the shell 1 are connected together through the positioning pin hole 2 to realize positioning. The oil outlet valve plate 5 is also provided with a conical surface 15, an oil outlet hole and a sealing seat surface 17. The sealing seat surface 17 is in contact with the steel ball 18. The upper part of the steel ball 18 is provided with a spring seat and a spring, which is responsible for pushing the steel ball 18 to the sealing seat surface 17 to realize sealing and keep the fuel in the pressure chamber 8 at high pressure. When the force applied to the spring decreases to a certain value, the pressure of the high-pressure fuel in the pressure chamber 8 offsets and exceeds the force of the spring, pushing away the steel ball 18. The fuel in the pressure chamber 8 leaks through the oil outlet hole 16 of the oil outlet valve plate 5. The oil inlet hole 13 of the oil inlet valve plate 4 continuously supplements high-pressure fuel into the pressure chamber 8. The diameter of the oil inlet hole 13 of the oil inlet valve plate 4 is smaller than that of the oil outlet hole 16 of the oil outlet valve plate 5, and the speed of the fuel supplement is less than that of the fuel leakage. The fuel pressure in the pressure chamber 8 continuously decreases, the pressure above the piston rod 6 decreases, and the piston rod 6 goes up. When the force applied to the spring continuously increases, the spring and the spring seat push the steel ball 18, offsetting the fuel pressure of the oil outlet hole of the oil outlet valve plate 5. The steel ball 18 is in close contact with the sealing seat surface 17 of the oil outlet valve plate 5, closing the oil outlet hole 16. The fuel in the pressure chamber 8 is continuously supplemented, the pressure in the pressure chamber 8 rises, and the piston rod 6 goes down. Through the closing and opening of the oil outlet hole 16, the up and down movement of the piston rod 6 is controlled under the action of fuel hydraulic force, realizing the working cycle.

[0024] The oil outlet hole 16 and the oil inlet hole 13 are separately arranged on the oil outlet valve plate 5 and the oil inlet valve plate 4, which can be realized by replacing the oil inlet valve plate 4 or the oil outlet valve plate 5 to adjust the flow coefficient. The existing structure of the sealing seat surface 17 in contact with the steel ball 18 is easy to wear due to the high-speed and high-frequency knocking of the steel ball 18, resulting in a decrease in sealing capacity, which requires regular replacement of the entire valve sleeve to realize. This structure only needs to replace the oil outlet valve plate 5 to solve the problem, and the oil inlet hole 13 and the piston hole can continue to be used, reducing waste. Similarly, the inner hole of the piston sleeve 7 wears out, which only needs to replace the piston sleeve 7, without the need for entire replacement.

[0025] Processing process, split structure, easy to process, single structure appears unqualified, does not affect the use of other structures, the piston sleeve is changed from the blind hole structure to the through hole structure, the processing difficulty is lower, and the process capacity of the equipment is reduced.

[0026] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the identified element.

[0027] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A novel combined valve sleeve, comprising a housing (1), a pressure chamber (8), a piston (3), an inlet valve plate (4), and an outlet valve plate (5), characterized in that: The piston (3) includes a piston rod (6) and a piston sleeve (7). The housing (1) has a pressure chamber (8) inside. The pressure chamber (8) has a guide hole (9) inside. The guide hole (9) has a guide sealing hole (10) below it. The piston rod (6) is slidably connected inside the guide sealing hole (10). The piston sleeve (7) has a sealing surface at its end face, which is in close contact with the lower end face of the oil inlet valve plate (4). The piston sleeve (7) also has an oil inlet (11) and an oil passage hole (12) at its shoulder step. The piston sleeve (7) has two positioning pin holes (2).

2. The novel combined valve sleeve according to claim 1, characterized in that: The oil inlet valve plate (4) has two sealing surfaces at both the top and bottom. The upper surface is in close contact with the lower surface of the oil outlet valve plate (5), and the lower surface is in close contact with the end face of the piston sleeve (7). The oil inlet valve plate (4) is also provided with an oil inlet hole (13) and an oil guide groove (14). The oil inlet valve plate (4) is also provided with two positioning pin holes (2).

3. The novel combined valve sleeve according to claim 1, characterized in that: The lower end face of the oil outlet valve plate (5) is a sealing surface. The lower end face of the oil outlet valve plate (5) is in close contact with the upper end face of the oil inlet valve plate (4). The oil outlet valve plate (5) is also provided with two positioning pin holes (2). The oil outlet valve plate (5) is also provided with a conical surface (15), an oil outlet hole (16) and a sealing seat surface (17). A steel ball (18) is provided on the top of the sealing seat surface (17). The sealing seat surface (17) is in contact with the steel ball (18). A spring seat and a spring are provided above the steel ball (18).

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