Piston rod seal structure for a pressure intensifier valve

Abstract

The utility model belongs to the technical field of pressure increasing valve, specifically is a kind of piston rod sealing structure of pressure increasing valve, including the piston rod assembled in cylinder body, cylinder body is divided into left and right two chambers by partition, piston rod slides through partition, two assembly grooves are set up on partition, two kinds of sealing structures can be adapted in assembly groove:one is Y type sealing ring, Y type sealing ring is sleeved on the circumference of piston rod, the opening of two Y type sealing rings respectively towards the chamber close to the side of itself, oil reservoir is further equipped between two Y type sealing rings in partition, piston rod passes through oil reservoir, the second is sealing ring and compression spring, sealing ring is sleeved on the circumference of piston rod, compression spring is terminated between sealing ring and assembly groove, sealing ring is equipped with first protrusion and second protrusion, the action point of compression spring is close to the outer diameter of sealing ring, this structure can realize two-way reliable sealing, automatic compensation wear, extend the service life of sealing structure and improve the operating stability of pressure increasing valve.

Description

Technical Field

[0001] This utility model belongs to the field of pressure boosting valve technology, specifically a piston rod sealing structure for a pressure boosting valve. Background Technology

[0002] Pressure boosting valves are auxiliary components used to increase fluid pressure. They are widely applicable to hydraulic and pneumatic systems, as well as machine tools, engineering machinery, and other scenarios. They can compensate for insufficient original system pressure, respond quickly to pressure demands, provide stable regulation, and have low energy consumption, thus meeting the high-pressure operation requirements of equipment under specific working conditions.

[0003] Existing booster valves are mainly composed of the following parts: valve body, piston, check valve, seals, pressure regulating components, piston rod, etc. The piston rod is an important component. Low-pressure air enters the drive chamber, the piston rod pushes the piston to move, and the fluid in the chamber is compressed to output high pressure.

[0004] Current pressure boosting valves suffer from the following drawbacks: the seals are prone to loosening due to high pressure, leading to media leakage; they also lack automatic compensation capabilities after wear, requiring frequent disassembly and replacement, resulting in poor sealing durability; furthermore, most are single-seal surface designs, which cannot simultaneously guarantee reliable sealing with the piston rod and assembly groove, leading to a significant decrease in sealing force after wear, a substantial increase in leakage risk, and a serious impact on the operational stability of the pressure boosting valve. Therefore, to address the above problems, a piston rod sealing structure for a pressure boosting valve is proposed. Utility Model Content

[0005] To overcome the shortcomings of existing booster valves, a piston rod sealing structure for booster valves is proposed.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The piston rod sealing structure of the booster valve of this utility model includes a piston rod assembled in a cylinder body. The cylinder body is divided into left and right chambers by a partition. The piston rod slides through the partition. The two ends of the piston rod extend into the two chambers respectively and are equipped with pistons. Two mounting grooves are opened on the partition. Y-shaped sealing rings are assembled in the mounting grooves. The Y-shaped sealing rings are sleeved on the circumference of the piston rod. The openings of the Y-shaped sealing rings face the chambers closer to them.

[0007] Preferably, an oil reservoir is provided inside the partition between the two Y-shaped sealing rings, and the piston rod passes through the oil reservoir.

[0008] Preferably, a sealing ring is fitted inside the assembly groove, the sealing ring is sleeved around the circumference of the piston rod, and a compression spring is connected between the sealing ring and the assembly groove.

[0009] Preferably, the sealing ring includes a first protrusion that abuts against the piston rod and a second protrusion that abuts against the inner wall of the assembly groove.

[0010] Preferably, the point of application of the compression spring is close to the outer diameter of the sealing ring.

[0011] The beneficial effects of this utility model are:

[0012] 1. Through the reverse opening design of the double Y-type sealing ring, the pressure of the two chambers can be used to achieve bidirectional pressure self-tightening sealing, and the lip of the Y-type sealing ring can automatically compensate after wear, which significantly enhances the sealing durability.

[0013] 2. Through the structure of double protrusions of the sealing ring and compression spring, the axial force of the spring is used to form a double radial seal, and the spring can automatically compensate for the wear of the sealing ring, which greatly improves the sealing reliability.

[0014] Both implementation methods address the sealing requirements of the booster valve piston rod, extending the service life of the sealing structure and improving the operational stability of the booster valve. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a cross-sectional view of the entire embodiment of this utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0018] Figure 3 This is a cross-sectional view of the entire embodiment of the present utility model, embodiment two;

[0019] Figure 4 yes Figure 3 Enlarged view of the structure at point B;

[0020] Legend:

[0021] 1. Cylinder block; 2. Piston rod; 3. Partition; 4. Piston; 5. Assembly groove; 6. Y-shaped seal ring; 7. Oil reservoir; 8. Sealing ring; 801. First protrusion; 802. Second protrusion; 9. Compression spring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Specific implementation examples are given below.

[0024] Example 1: Please refer to Figures 1-2 The present invention discloses a piston rod sealing structure for a booster valve, comprising a piston rod 2 assembled within a cylinder 1. The cylinder 1 is divided into left and right chambers by a partition 3. The piston rod 2 slides through the partition 3, and both ends of the piston rod 2 extend into the two chambers respectively and are fitted with pistons 4. The partition 3 has two mounting grooves 5, and Y-shaped sealing rings 6 are fitted in the mounting grooves 5. The Y-shaped sealing rings 6 are sleeved around the circumference of the piston rod 2, with their openings facing the chambers closest to them. An oil reservoir 7 is provided in the partition 3 between the two Y-shaped sealing rings 6, and the piston rod 2 passes through the oil reservoir 7. During operation, in a static state, the Y-shaped sealing rings 6 rely on their own rubber elasticity to achieve initial contact with the outer circumferential surface of the piston rod 2 and the inner wall of the mounting grooves 5, forming a basic seal. When the booster valve operates, pressure is generated in the left and right chambers respectively, and the pressure acts on the openings of the corresponding Y-shaped sealing rings 6. The pressure in the left chamber... The pressure forces the opening of the left Y-shaped sealing ring 6 to open, allowing its lip to fit more tightly against the piston rod 2 and the mounting groove 5. Similarly, the pressure in the right chamber forces the opening of the right Y-shaped sealing ring 6 to open, thus achieving bidirectional pressure self-tightening sealing of both chambers. Furthermore, after the lip of the Y-shaped sealing ring 6 expands under air pressure, it can compensate for the seal after its working wear, further enhancing the service life of the booster valve. At the same time, the lubricating oil stored in the oil reservoir 7 will be carried out when the piston rod 2 reciprocates, continuously lubricating the contact surface between the Y-shaped sealing ring 6 and the piston rod 2, reducing friction between them. Through the above structural design, using a double Y-shaped sealing ring 6 with opposite opening directions, the pressure of the left and right chambers can be simultaneously handled, achieving bidirectional reliable sealing. The oil reservoir 7 provides continuous lubrication to the sealing contact surface, reducing the wear rate of the Y-shaped sealing ring 6, extending the service life of the sealing structure, and reducing the frictional resistance when the piston rod 2 slides, thus improving the operational stability of the booster valve.

[0025] Example 2: Please refer to Figures 3-4Based on Embodiment 1, the Y-shaped sealing ring 6 in Embodiment 1 is adjusted to a sealing ring 8 and a compression spring 9. The sealing ring 8 is fitted inside the assembly groove 5 and is sleeved around the circumference of the piston rod 2. A compression spring 9 is connected between the sealing ring 8 and the assembly groove 5. The sealing ring 8 includes a first protrusion 801 that abuts against the piston rod 2 and a second protrusion 802 that abuts against the inner wall of the assembly groove 5. The point of action of the compression spring 9 is close to the outer diameter of the sealing ring 8. During operation, the compression spring 9 applies an axial preload to the sealing ring 8. Because the point of action of the compression spring 9 is close to the outer diameter of the sealing ring 8, this axial force will... The force is decomposed into a radial component pointing towards the piston rod 2 and a radial component pointing towards the inner wall of the assembly groove 5. This pushes the first protrusion 801 to tightly abut against the outer circumferential surface of the piston rod 2 and the second protrusion 802 to tightly abut against the inner wall of the assembly groove 5, forming a double radial seal. If the sealing ring 8 experiences slight wear due to long-term use, the elastic force of the compression spring 9 will automatically compensate for the wear and maintain a stable sealing force. Through the cooperation of the above structures, the double protrusion design of the sealing ring 8 forms a seal against the piston rod 2 and the inner wall of the assembly groove 5 respectively. This double protection improves the overall sealing reliability and can effectively prevent high-pressure media from leaking from the gap between the piston rod 2 and the assembly groove 5.

[0026] The cylinder body, piston rod, and piston basic structure that realize the basic transmission function of the booster valve in this utility model, as well as the conventional machining and forming of the oil reservoir and the lubricating oil storage design, are all conventional technologies in this field. Therefore, the commonly used cast iron and aluminum alloy materials of the cylinder body, the stainless steel material and surface treatment process of the piston rod, the sealing fit dimensions of the piston, and the conventional lubricating oil type and volume design of the oil reservoir, as well as the specific types, models, and processing parameters, are all well known to those skilled in the art and are not the innovation of this utility model. Therefore, they will not be described in detail here.

[0027] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A piston rod sealing structure for a booster valve, comprising a piston rod (2) assembled in a cylinder (1), the cylinder (1) being divided into left and right chambers by a partition (3), the piston rod (2) slidingly passing through the partition (3), and both ends of the piston rod (2) extending into the two chambers respectively and being fitted with pistons (4), characterized in that: Two mounting slots (5) are provided on the partition (3). A Y-shaped sealing ring (6) is installed in the mounting slot (5). The Y-shaped sealing ring (6) is sleeved on the circumference of the piston rod (2). The opening of the Y-shaped sealing ring (6) faces the chambers on the side closest to it.

2. The piston rod sealing structure of the booster valve according to claim 1, characterized in that: An oil reservoir (7) is provided inside the partition (3) between the two Y-shaped sealing rings (6), and the piston rod (2) passes through the oil reservoir (7).

3. The piston rod sealing structure of the booster valve according to claim 1, characterized in that: A sealing ring (8) is fitted inside the assembly groove (5). The sealing ring (8) is sleeved around the circumference of the piston rod (2). A compression spring (9) is connected between the sealing ring (8) and the assembly groove (5).

4. The piston rod sealing structure of a booster valve according to claim 3, characterized in that: The sealing ring (8) includes a first protrusion (801) that abuts against the piston rod (2) and a second protrusion (802) that abuts against the inner wall of the assembly groove (5).

5. The piston rod sealing structure of a booster valve according to claim 3, characterized in that: The point of action of the compression spring (9) is close to the outer diameter of the sealing ring (8).

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