A floating connection device with bidirectional sealing function

Abstract

The present invention belongs to the field of fluid sealing technology and discloses a floating connection device with a two-way sealing function. The device includes: a convex body, a floating connection sleeve assembly, a spring, and a concave body; a cylindrical cavity is provided inside the convex body, and two stepped cylindrical cavities with a large outer diameter and a small inner diameter are provided inside the concave body; the spring and the floating connection sleeve assembly are sequentially installed in the outer cylindrical cavity of the concave body, and the floating connection sleeve assembly is installed in the outer cylindrical cavity inside the concave body. The spring is located between the floating connection sleeve assembly and the outer cylindrical cavity boss inside the concave body. The outer cylindrical surface of the floating connection sleeve assembly is in contact with the inner wall surface of the cylindrical cavity of the concave body. The large end surface of one side of the floating connection sleeve assembly is in contact with the end surface of the corresponding position of the convex body, and the small end surface of the other side of the floating connection sleeve assembly is in contact with the spring. The present invention solves the sealing connection problem caused by the floating valve plate structure of large-flow high-pressure and ultra-high-pressure pump motors.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid sealing, and relates to a floating connection device with a bidirectional sealing function, which is generally applicable to high-pressure fluid equipment such as hydraulic pump motors, pneumatic motors, and compressors. Background Art

[0002] As fluid equipment such as hydraulic pump motors, pneumatic motors, and compressors continue to develop towards high pressure, high speed, and large flow, if the pressure changes greatly during the high-low pressure conversion process, it will cause greater impact, vibration, and noise. Traditional fixed sealing connection devices are not able to adapt to high-frequency micro-motion conditions, and are prone to a sharp increase in leakage due to micro-motion wear, leading to problems such as reduced system efficiency, shortened service life, and insufficient reliability. Summary of the Invention

[0003] The purpose of the present invention is to provide a floating connection device with a two-way sealing function to solve the dynamic sealing problem of high-pressure and ultra-high-pressure fluid equipment. The traditional fixed sealing connection device is changed into a floating connection device. Without significantly increasing the space size requirements, the mechanical sealing structure and the elastic combined sealing structure are integrated to avoid the risks of micro-motion wear, large leakage and other problems.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A floating connection device with a bidirectional sealing function comprises a convex body 1, a floating connection sleeve assembly 2, a spring 3 and a concave body 4.

[0006] The convex body 1 is provided with a cylindrical cavity inside, and the concave body 4 is provided with two stepped cylindrical cavities with a larger outer diameter and a smaller inner diameter. High-pressure fluid is stored in each cylindrical cavity.

[0007] The spring 3 and the floating connection sleeve assembly 2 are installed in the large-diameter cylindrical cavity on the outside of the concave body 4 in sequence, and the floating connection sleeve assembly 2 is installed in the cylindrical cavity on the outside of the concave body 4. The spring 3 is located between the floating connection sleeve assembly 2 and the cylindrical cavity boss on the outside of the concave body 4. The outer cylindrical surface of the floating connection sleeve assembly 2 is in contact with the inner wall surface of the cylindrical cavity of the concave body 4. The large end face on one side of the floating connection sleeve assembly 2 is in contact with the end face at the corresponding position of the convex body 1, and the small end face on the other side of the floating connection sleeve assembly 2 is in contact with the spring 3.

[0008] Furthermore, the floating connection sleeve assembly 2 includes a wear-resistant sealing ring 5, an O-ring 6, a floating connection sleeve 7 and a retaining ring 8; the floating connection sleeve 7 has a cylindrical through hole inside and a rotating body part with a three-step ring platform structure on the outer wall. The wear-resistant sealing ring 5 and the retaining ring 8 are sequentially mounted on the three-step ring platform structure of the floating connection sleeve 7 from left to right. The wear-resistant sealing ring 5 is in contact and close contact with the corresponding surface of the second-step ring platform of the floating connection sleeve 7 in both axial and radial directions. The retaining ring 8 is locked and positioned by the third-step ring platform of the floating connection sleeve 7. The O-ring 6 is located between the wear-resistant sealing ring 5 and the floating connection sleeve 7 and is in contact and close contact with the retaining ring 8. The O-ring 6 is compressed and deformed by the retaining ring 8, thereby pre-tightening the wear-resistant sealing ring 5.

[0009] Furthermore, a three-step ring platform structure with decreasing outer diameters from left to right is provided on the outer wall of the floating connecting sleeve 7. The ring platform with the smallest outer diameter is a thin-walled blade edge, and the retaining ring 8 is sleeved on this ring platform for pressure deformation assembly; the middle ring platform is used to support and fix the wear-resistant sealing ring 5 and the O-ring 6; the ring platform with the largest outer diameter is used to axially position the wear-resistant sealing ring 5, and its end face contacts the convex body 1 to form a mechanical seal.

[0010] Furthermore, the floating connection sleeve 7 is made of a metal material with good shapeability.

[0011] Furthermore, the wear-resistant sealing ring is integrally formed by a sealing ring body and a chamfered portion, the sealing ring body is a circular ring, the chamfered portion is connected to the end of the sealing ring body, the inner surface of the chamfered portion connected to the sealing ring body is designed to be a rounded transition, and the outer surface is designed with a chamfer, the outer wall of the sealing ring body contacts the cavity wall of the concave body to form an elastic seal; the rounded curved surface of the inner surface of the chamfered portion is used to accommodate the elastic deformation and extrusion of the O-ring to achieve radial elastic sealing.

[0012] Furthermore, the wear-resistant sealing ring 5 is made of a polymer material used for wear-resistant bearings.

[0013] Furthermore, the wear-resistant sealing ring 5 is made of PTFE, PEEK or a self-lubricating composite material.

[0014] Furthermore, the O-ring 6 is made of a soft elastic material that is highly compatible with high-pressure fluid.

[0015] Furthermore, the O-ring 6 is made of FKM or NBR.

[0016] Furthermore, the retaining ring 8 is made of a metal material with relatively high hardness.

[0017] The significant effects of the present invention are: improving the vibration, noise and leakage problems caused by high-speed and high-pressure operation and high-low pressure conversion processes of high-pressure and ultra-high-pressure fluid equipment; avoiding the sealing leakage problems caused by vibration, deflection and rigid connection under structural space constraints; solving the sealing and wear resistance problems of the floating sleeve; the present invention can solve the sealing connection problems caused by the floating distribution plate structure of large-flow high-pressure and ultra-high-pressure pump motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a floating connection device with a bidirectional sealing function provided by the present invention;

[0019] Figure 2 This is a structural cross-sectional view of the floating connection sleeve assembly provided by the present invention;

[0020] Figure 3 This is a cross-sectional view of the structure of the floating connecting sleeve provided by the present invention;

[0021] Figure 4 This is a cross-sectional view of the structure of the wear-resistant sealing ring provided by the present invention;

[0022] In the figure: 1. convex body; 2. floating connecting sleeve assembly; 3. spring; 4. concave body; 5. wear-resistant sealing ring; 6. O-ring; 7. floating connecting sleeve; 8. retaining ring. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Figure 1This is a schematic diagram of the structure of a floating connection device with bidirectional sealing provided by the present invention. Bidirectional relative movement is achieved between a male body 1 and a female body 4. Typically, the male body 1 has a cylindrical cavity within it, while the female body 4 has two stepped cylindrical cavities of different diameters within it. High-pressure fluid is stored within each cylindrical cavity. To address the problem of sealing a high-pressure fluid connection, a floating connection device with bidirectional sealing is proposed, consisting of a male body 1, a floating connection sleeve assembly 2, a spring 3, and a female body 4. The spring 3 and floating joint assembly 2 are sequentially installed within the cylindrical cavity with a larger diameter outside the concave body 4. The floating joint assembly 2 is installed within the cylindrical cavity with a larger diameter inside the concave body 4. The spring 3 is located between the floating joint assembly 2 and the boss of the cylindrical cavity outside the concave body 4. The outer cylindrical surface of the floating joint assembly 2 contacts the inner wall of the cylindrical cavity of the concave body 4. The large end surface of one side of the floating joint assembly 2 aligns with the end surface of the corresponding position of the convex body 1, and the small end surface of the other side of the floating joint assembly 2 contacts the spring 3. The operating principle is as follows: in the axial direction, the floating joint assembly 2 and the convex body 1 are connected by the principle of end-face mechanical sealing; in the radial direction, the floating joint assembly 2 and the concave body 4 are connected by the principle of rubber-plastic composite elastic sealing. During low fluid pressure conditions (such as during equipment startup), the floating connector assembly 2 has a certain interference fit with the inner wall of the concave body 4. The preload force generated by spring 3 presses the floating connector assembly 2 against the convex body 1, forming a two-way seal. During high fluid pressure conditions (such as during the equipment's stable operation), the high pressure generated by the fluid presses the floating connector assembly 2 against the inner wall of the concave body 4 and the end face of the convex body 1, forming a two-way seal. During the equipment's high- and low-pressure switching, the floating connector assembly can adapt to dynamic operating conditions such as small-amplitude high-frequency vibrations of the concave body and alternating fluid pressure pulsations.

[0025] Figure 2 This is a cross-sectional view of the structure of the floating connection sleeve assembly provided by the present invention. Figure 2As shown, the floating connection sleeve assembly 2 includes a wear-resistant sealing ring 5, an O-ring 6, a floating connection sleeve 7, and a retaining ring 8. The floating connection sleeve 7 is a rotating part with a cylindrical inner hole and a three-step annular structure on its outer wall. The wear-resistant sealing ring 5 and the retaining ring 8 are sequentially mounted on the three-step annular structure of the floating connection sleeve 7. The wear-resistant sealing ring 5 is in contact with the corresponding surface of the floating connection sleeve 7 in both the axial and radial directions. The retaining ring 8 is locked and positioned by the floating connection sleeve 7. The O-ring 6 is located between the wear-resistant sealing ring 5 and the floating connection sleeve 7 and is in contact with the retaining ring 8. The O-ring 6 is compressed and deformed by the retaining ring 8, thereby pre-tightening the wear-resistant sealing ring 5. In the present invention, the floating connection sleeve 7 is generally made of a metal material with good plasticity. The wear-resistant sealing ring 5 is generally a polymer material used for wear-resistant bearings, such as PTFE, PEEK, or self-lubricating composite materials. The O-ring 6 is generally made of a soft elastic material with good compatibility with high-pressure fluids, such as FKM or NBR. The retaining ring 8 is generally made of a metal material with relatively high hardness, which satisfies the stopping, shaping and positioning requirements of the thin-walled edge of the floating connecting sleeve 7 during the pressure deformation assembly process, making the floating connecting sleeve assembly 2 a modular whole.

[0026] Figure 3 This is a cross-sectional view of the structure of the floating connection sleeve provided by the present invention. Figure 3 As shown, the floating connection sleeve 7 is a rotating component featuring a three-stage ring platform structure, with its inner bore serving as a channel for high-pressure fluid. The outer wall of the floating connection sleeve 7 is divided into three stages, labeled A, B, and C, from left to right. Stage A, with the smallest outer diameter, is a thin-walled blade edge, where retaining ring 8 fits for pressure-deformed assembly. Stage B, the middle stage, is a precision-machined stage used to support and secure the wear-resistant sealing ring 5 and O-ring 6. Stage C, with the largest outer diameter, is a precision-machined stage used to axially position the wear-resistant sealing ring 5 and contact the protrusion 1 to form a mechanical seal. The right end face of stage C must meet high-precision shape requirements, high-hardness surface treatment requirements, and high pressure-forming assembly requirements. Furthermore, the mating surface of protrusion 1 must possess a highly precise shape profile and high-quality surface morphology.

[0027] Figure 4 This is a cross-sectional view of the structure of the wear-resistant sealing ring provided by the present invention. Figure 4As shown, the wear-resistant sealing ring 5 is an annular component made of wear-resistant rubber-plastic material. It is integrally formed from a sealing ring body and a chamfered portion. The sealing ring body is a circular ring, and the chamfered portion connects to the end of the sealing ring body. The inner surface of the chamfered portion, which connects to the sealing ring body, is designed with a rounded transition. The outer surface D is chamfered, and the outer wall of the sealing ring body contacts the cavity wall of the concave body, forming an elastic seal. The rounded curved surface of the inner surface E of the chamfered portion accommodates the elastic deformation and extrusion of the O-ring, achieving a radial elastic seal. Because the outer diameter of the sealing ring body is larger than the outer diameter of the smaller end of the chamfered portion, an area ratio, or compression coefficient, is formed. The axial compression force increases with increasing fluid pressure. The rounded curved surface of the inner surface E accommodates the elastic deformation and extrusion of the O-ring 6, achieving a radial elastic seal. Generally, the elastic modulus and hardness of the O-ring 6 are much lower than those of the wear-resistant sealing ring 5. The wear-resistant sealing ring 5 is generally made of wear-resistant rubber and plastic sealing materials, which has high self-lubricating ability, reduces friction resistance, and cooperates with the O-ring 6 to achieve a high-response dynamic sealing effect.

Claims

1. A floating connection device with a two-way sealing function, characterized in that: The device comprises: a convex body (1), a floating connection sleeve assembly (2), a spring (3) and a concave body (4); A cylindrical cavity is provided inside the convex body (1), and two stepped cylindrical cavities with a larger outer diameter and a smaller inner diameter are provided inside the concave body (4), and high-pressure fluid is stored inside each cylindrical cavity; The spring (3) and the floating connection sleeve assembly (2) are sequentially installed in the outer large-diameter cylindrical cavity of the concave body (4), the floating connection sleeve assembly (2) is installed in the inner outer cylindrical cavity of the concave body (4), the spring (3) is located between the floating connection sleeve assembly (2) and the inner outer cylindrical cavity boss of the concave body (4), the outer cylindrical surface of the floating connection sleeve assembly (2) is in contact with the inner wall surface of the cylindrical cavity of the concave body (4), the large end surface of one side of the floating connection sleeve assembly (2) is in contact with the end surface of the corresponding position of the convex body (1), and the small end surface of the other side of the floating connection sleeve assembly (2) is in contact with the spring (3); The floating connection sleeve assembly (2) comprises a wear-resistant sealing ring (5), an O-ring (6), a floating connection sleeve (7) and a retaining ring (8); the floating connection sleeve (7) is provided with a cylindrical through hole inside and a rotating body part with a three-step ring platform structure on the outer wall; the wear-resistant sealing ring (5) and the retaining ring (8) are sequentially sleeved on the three-step ring platform structure of the floating connection sleeve (7) from left to right; the wear-resistant sealing ring (5) is in contact and close contact with the corresponding surface of the second-step ring platform of the floating connection sleeve (7) in both axial and radial directions; the retaining ring (8) is locked and positioned by the third-step ring platform of the floating connection sleeve (7); the O-ring (6) is located between the wear-resistant sealing ring (5) and the floating connection sleeve (7) and is in contact and close contact with the retaining ring (8); the O-ring (6) is compressed and deformed by the retaining ring (8), thereby pre-tightening the wear-resistant sealing ring (5).

2. The floating connection device with bidirectional sealing function according to claim 1, characterized in that: The outer wall of the floating connecting sleeve (7) is provided with a three-step ring platform structure with outer diameters decreasing from left to right. The ring platform with the smallest outer diameter is a thin-walled blade edge, and the retaining ring (8) is sleeved on this ring platform for pressure deformation assembly; the middle ring platform is used to support and fix the wear-resistant sealing ring (5) and the O-ring (6); the ring platform with the largest outer diameter is used to axially position the wear-resistant sealing ring (5), and its end face contacts the convex body (1) to form a mechanical seal.

3. The floating connection device with bidirectional sealing function according to claim 2, characterized in that: The floating connecting sleeve is made of a metal material with good plasticity.

4. The floating connection device with bidirectional sealing function according to claim 3, characterized in that: The wear-resistant sealing ring is integrally formed by a sealing ring body and a chamfered portion. The sealing ring body is a circular ring, and the chamfered portion is connected to the end of the sealing ring body. The inner surface of the chamfered portion connected to the sealing ring body is designed to be a rounded transition, and the outer surface is designed with a chamfer. The outer wall of the sealing ring body contacts the cavity wall of the concave body to form an elastic seal; the rounded curved surface of the inner surface of the chamfered portion is used to accommodate the elastic deformation and extrusion of the O-ring to achieve radial elastic sealing.

5. The floating connection device with bidirectional sealing function according to claim 4, characterized in that: The wear-resistant sealing ring is a polymer material used for wear-resistant bearings.

6. The floating connection device with bidirectional sealing function according to claim 5, characterized in that: The wear-resistant sealing ring is made of self-lubricating composite material.

7. The floating connection device with bidirectional sealing function according to claim 2, characterized in that: O-rings are made of soft elastic material that is compatible with high-pressure fluids.

8. The floating connection device with bidirectional sealing function according to claim 7, characterized in that: O-rings are FKM or NBR.

9. The floating connection device with bidirectional sealing function according to claim 2, characterized in that: The retaining ring is made of metal material with relatively high hardness.

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