Self-pressurization energy storage type seal

Abstract

The invention belongs to the technical field of sealing, and particularly relates to a self-pressurization energy storage type seal which comprises a sealed shaft, a swallow-tail-shaped clamping sleeve, a V-shaped spring, a triangular block and a sealing cavity. An opening is formed in the front end of the swallow-tail-shaped clamping sleeve, the V-shaped spring is installed in the opening and used for opening the opening and providing pretension, and the boss is designed at the opening end of the swallow-tail-shaped clamping sleeve and plays a role in limiting the V-shaped spring, so that the phenomenon that the V-shaped spring is disengaged in the working process is prevented. The tail portion of the dovetail-shaped clamping sleeve is designed to be of a dovetail-type scissor-type structure, the triangular block is arranged in the dovetail-type scissor-type structure, and the dovetail-type scissor-type structure is in a clearance fit state under the pressure-free effect. The V-shaped spring is arranged in the opening of the dovetail-shaped clamping sleeve and is positioned, the boss at the opening end is clamped, then the triangular block is embedded into the dovetail-shaped groove of the dovetail-shaped clamping sleeve, and then the V-shaped spring and the dovetail-shaped clamping sleeve are integrally assembled into the opening sealing groove between the sealing shaft and the sealing cavity. Compared with a traditional sealing structure, the self-pressurization energy storage type seal has a better high-pressure-resistant sealing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing, and in particular relates to a self-pressurizing energy storage seal suitable for high-pressure working environments. Background Art

[0002] The sealing structure is an important structure to ensure the normal operation of mechanical equipment. It is mainly used to control the leakage behavior of the mechanical structure to save materials, save energy and reduce costs. The energy storage seal is a sealing structure with excellent performance. It has a wide range of application prospects in ultra-high temperature, ultra-low temperature, corrosive media and ultra-high pressure conditions. It is mainly composed of an open plastic jacket and an open inner spring, such as Figure 2 shown.

[0003] With the development of industrial demand, the system pressure requirements for hydraulic systems in the aviation, shipbuilding and chemical industries are increasing. The sealing performance of traditional energy storage seals under high pressure is being tested and needs to be modified to meet the increasingly high actual pressure requirements.

[0004] In order to solve the above-mentioned problems, it is necessary to provide a self-pressurizing energy storage seal to improve the sealing effect of the seal under high pressure. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is: how to provide a self-pressurizing energy storage seal that can significantly improve the sealing effect of high-pressure fluid media.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the present invention provides a self-pressurizing energy storage seal, which comprises: a sealed shaft (1), a dovetail jacket (2), a V-shaped spring (3), a triangular block (4) and a sealing cavity (5);

[0009] The dovetail jacket (2) is wrapped around the outer periphery of the sealed shaft (1) and is placed together inside the sealing cavity (5). The front end of the dovetail jacket (2) is open and a V-shaped spring (3) is installed. A boss is designed at the open end of the dovetail jacket (2) to limit the V-shaped spring (3). The tail of the dovetail jacket (2) is designed as a dovetail-type scissor-type groove, and the triangular block (4) is installed therein, and is in a clearance fit state under no pressure.

[0010] Wherein, in a clearance fit state without pressure, the clearance between the dovetail jacket (2) and the triangular block (4) is set to 0.3 mm-0.5 mm.

[0011] The front end cone angle of the triangular block (4) is set to 60°±5° in a normal state, and the front end cone angle is set to deform to 120°±5° when the dovetail jacket (2) and the triangular block (4) are in a completely contacted and pressed state.

[0012] Wherein, the dovetail jacket 2 is made of polyurethane material, and the Shore hardness is set between 80 degrees and 90 degrees.

[0013] The triangular block (4) is made of a soft nitrile rubber material, and the Shore hardness is set between 60 degrees and 70 degrees.

[0014] Wherein, the contact threshold pressure between the dovetail jacket (2) and the triangular block (4) is set to 20 MPa.

[0015] During assembly, the V-shaped spring (3) is first installed into the front end opening of the dovetail jacket (2) and positioned, the boss at the open end of the dovetail jacket (2) is clamped, and then the triangular block (4) is embedded into the dovetail groove at the tail of the dovetail jacket (2), and then the whole is assembled into the open sealing groove between the sealing shaft 1 and the sealing cavity (5).

[0016] In actual use, the opening direction of the dovetail jacket (2) faces the sealed fluid, and there is no pressure on the back side. The sealed fluid will push the dovetail jacket (2) to move towards the triangular block (4) until it fits tightly, eliminating the gap between the two. As the pressure of the sealed fluid increases, the triangular block (4) deforms under pressure, and the cone angle at its front end will open the dovetail jacket (2), so that the dovetail contacts the sealing wall.

[0017] Among them, this contact effect will only occur when the pressure reaches a certain level, and the greater the pressure, the stronger the contact force, which improves the sealing ability of the sealing system. Based on the experience in actual use, the contact threshold pressure is designed to 20Mpa, and the specific structural parameter design is completed through finite element analysis.

[0018] The dovetail jacket (2) presses the triangular block (4) under the action of fluid pressure, and the triangular block (4) is significantly deformed under the influence of the load, which is manifested in that the front end cone angle of the triangular block (4) increases, the height decreases, and the width increases, which in turn causes the dovetail part of the dovetail jacket 2 to be stretched open and contact the sealing wall surface, forming a new channel to prevent fluid leakage, thereby increasing the sealing ability of the seal; the increase in the sealing ability is related to the deformation of the triangular block (4), and further to the pressure of the sealing fluid, that is, the greater the fluid pressure, the stronger the sealing ability of the seal, thereby achieving a self-tightening seal.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the beneficial effect of the present invention is that, through the combination of the triangular block and the dovetail jacket, a self-tightening sealing effect is achieved, in which the greater the pressure, the better the sealing effect, thereby effectively improving the sealing ability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a self-pressurizing energy storage seal;

[0022] Figure 2 It is a traditional energy storage sealing structure;

[0023] Figure 3 It is a self-pressurizing energy storage seal pressurization bonding diagram;

[0024] Figure 4 This is the pressurized deformation diagram of the self-pressurizing accumulator;

[0025] Figure 5 This is a structural diagram of a combined pneumatic seal.

[0026] In the figure, 1-sealed shaft; 2-dovetail jacket; 3-V-shaped spring; 4-triangular block; 5-sealing cavity; 6-pneumatic base; 7-serrated structure; 8-X-shaped ring; 9-large O-ring; 10-small O-ring; 11-pneumatic sealing groove. DETAILED DESCRIPTION

[0027] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0028] In order to solve the above technical problems, the present invention provides a self-pressurizing energy storage seal, which comprises: a sealed shaft (1), a dovetail jacket (2), a V-shaped spring (3), a triangular block (4) and a sealing cavity (5);

[0029] The dovetail jacket (2) is wrapped around the outer periphery of the sealed shaft (1) and is placed together inside the sealing cavity (5). The front end of the dovetail jacket (2) is open and a V-shaped spring (3) is installed. A boss is designed at the open end of the dovetail jacket (2) to limit the V-shaped spring (3). The tail of the dovetail jacket (2) is designed as a dovetail-type scissor-type groove, and the triangular block (4) is installed therein, and is in a clearance fit state under no pressure.

[0030] Wherein, in a clearance fit state without pressure, the clearance between the dovetail jacket (2) and the triangular block (4) is set to 0.3 mm-0.5 mm.

[0031] The front end cone angle of the triangular block (4) is set to 60°±5° in a normal state, and the front end cone angle is set to deform to 120°±5° when the dovetail jacket (2) and the triangular block (4) are in a completely contacted and pressed state.

[0032] Wherein, the dovetail jacket 2 is made of polyurethane material, and the Shore hardness is set between 80 degrees and 90 degrees.

[0033] The triangular block (4) is made of a soft nitrile rubber material, and the Shore hardness is set between 60 degrees and 70 degrees.

[0034] Wherein, the contact threshold pressure between the dovetail jacket (2) and the triangular block (4) is set to 20 MPa.

[0035] During assembly, the V-shaped spring (3) is first installed into the front end opening of the dovetail jacket (2) and positioned, the boss at the open end of the dovetail jacket (2) is clamped, and then the triangular block (4) is embedded into the dovetail groove at the tail of the dovetail jacket (2), and then the whole is assembled into the open sealing groove between the sealing shaft 1 and the sealing cavity (5).

[0036] In actual use, the opening direction of the dovetail jacket (2) faces the sealed fluid, and there is no pressure on the back side. The sealed fluid will push the dovetail jacket (2) to move towards the triangular block (4) until it fits tightly, eliminating the gap between the two. As the pressure of the sealed fluid increases, the triangular block (4) deforms under pressure, and the cone angle at its front end will open the dovetail jacket (2), so that the dovetail contacts the sealing wall.

[0037] Among them, this contact effect will only occur when the pressure reaches a certain level, and the greater the pressure, the stronger the contact force, which improves the sealing ability of the sealing system. Based on the experience in actual use, the contact threshold pressure is designed to 20Mpa, and the specific structural parameter design is completed through finite element analysis.

[0038] The dovetail jacket (2) presses the triangular block (4) under the action of fluid pressure, and the triangular block (4) is significantly deformed under the influence of the load, which is manifested in that the front end cone angle of the triangular block (4) increases, the height decreases, and the width increases, which in turn causes the dovetail part of the dovetail jacket 2 to be stretched open and contact the sealing wall surface, forming a new channel to prevent fluid leakage, thereby increasing the sealing ability of the seal; the increase in the sealing ability is related to the deformation of the triangular block (4), and further to the pressure of the sealing fluid, that is, the greater the fluid pressure, the stronger the sealing ability of the seal, thereby achieving a self-tightening seal.

[0039] Example 1

[0040] The present embodiment provides a self-pressurized energy storage seal, including a sealed shaft 1, a dovetail jacket 2, a V-shaped spring 3, a triangular block 4, and a sealing cavity 5; the front end of the dovetail jacket 2 is open, and a V-shaped spring 3 is installed to prop the opening open and provide pre-tension. A boss is designed at the open end of the dovetail jacket 2 to limit the V-shaped spring 3 and prevent it from slipping out during operation. The tail of the dovetail jacket 2 is designed as a dovetail-type scissor-type structure groove, and the triangular block 4 is installed therein. It is in a clearance fit state under no pressure, and the clearance is set to 0.3mm-0.5mm, so as to reserve enough deformation space for the triangular block 4. During assembly, first install the V-shaped spring 3 into the opening of the dovetail jacket 2 and position it, clamp the boss at the open end, and then embed the triangular block 4 into the dovetail groove of the dovetail jacket 2, and then assemble the whole into the opening sealing groove between the sealing shaft 1 and the sealing cavity 5, such as Figure 1 shown.

[0041] In actual use, the opening direction of the dovetail jacket 2 faces the sealed fluid, and there is no pressure on the back. The sealed fluid will push the dovetail jacket 2 to move towards the triangular block 4 until it fits tightly, eliminating the gap between the two. Figure 3 As the pressure of the sealed fluid increases, the whole system begins to deform, the triangular block deforms under pressure, and the cone angle at its front end will open the dovetail jacket 2, so that the dovetail contacts the sealing wall, as shown in the figure. Figure 4 This contact effect occurs only when the pressure reaches a certain level, and the greater the pressure, the stronger the contact force, which improves the sealing ability of the sealing system. Based on the experience in actual use, the contact threshold pressure is designed to 20Mpa, and the specific structural parameter design is completed through finite element analysis.

[0042] Through sufficient test verification, the sealing form formed by the dovetail structure and the triangular structure has achieved the sealing characteristic that the greater the pressure, the better the sealing effect. Specifically, the dovetail jacket 2 presses the triangular block 4 under the action of fluid pressure, and the triangular block 4 is significantly deformed under the influence of the load, which is manifested as the front end cone angle of the triangular block 4 increases, the height decreases, and the width increases, which in turn causes the dovetail part of the dovetail jacket 2 to be stretched open and contact with the sealing wall surface, forming a new channel to prevent fluid leakage, and increasing the sealing ability of the seal; this increase in sealing ability is related to the deformation of the triangular block 4, and then to the pressure of the sealing fluid, that is, the greater the fluid pressure, the stronger the sealing ability of the seal, which is a self-tightening seal.

[0043] In fact, the core of the present invention is the above-mentioned structural form, specifically, the effect of the sealing shape. Further, the sealing size and sealing material can be restricted. Through analysis, the smaller the initial front end cone angle of the triangular block 4 is, the stronger the effect of pressurized energy storage is. However, too small an angle is likely to cause damage during the extrusion process. Through finite element analysis and experimental verification, the front end cone angle of the triangular block 4 is finally set to 60°±5°. When the dovetail jacket 2 and the triangular block 4 are completely in contact and pressed, the front end cone angle is set to 120°±5°. At this time, the energy storage state is optimal, and the extrusion damage of the triangular block 4 can be effectively avoided. The dovetail jacket 2 is set to a polyurethane material, and the Shore hardness is set between 80-90 degrees, which is relatively hard. At the same time, the material of the triangular block 4 is made of soft materials such as nitrile rubber, and the Shore hardness is set between 60-70 degrees to enhance the pressurized effect. Through experimental verification, this combination of softness and hardness can achieve the best matching degree of sealing performance and reliability.

[0044] In addition to the liquid sealing environment, the present invention also mentions the consideration of pneumatic sealing:

[0045] The main function of pneumatic seals is to seal high-pressure gas, especially in oil and gas suspension actuators. Since it is much more difficult to seal high-pressure gas than liquid, how to design the pneumatic seal structure is particularly important. The traditional combined pneumatic seal is mainly composed of a pneumatic base 6, an X-ring 8 and two large O-rings 9. After repeated tests, the present invention proposes a combined pneumatic seal structure with a serrated structure, which improves the following: Figure 5 In the novel pneumatic sealing structure shown, the entire pneumatic seal is installed in the pneumatic sealing groove 11, and the surface portion of the pneumatic base 6 in contact with the cylinder is designed to be a serrated structure 7, replacing the traditional smooth plane, and a groove is processed in the middle portion for installing the X-ring 8. The serrated structure 7 mainly reduces the fluid pressure inside the seal in a step-by-step manner through multiple sealing edges, reduces the impact pressure on the X-ring 8, and effectively reduces the initial contact area and friction between the combined seal and the inner wall of the cylinder. Through experimental tests, with the X-ring 8 as the dividing point, the number of serrations on the surface of each side of the pneumatic base 6 should be designed to be 2-3 to achieve a more ideal state.

[0046] Two symmetrical laterally open grooves are designed at the lower end of the pneumatic base 6 for installing large O-rings 9 respectively. At the same time, a sealing groove is processed in the middle part of the bottom end of the pneumatic base 6 for installing a small O-ring 10. The large O-ring 9 mainly provides sufficient pre-tightening force for the surface of the serrated structure 7, while the small O-ring 10 mainly provides sufficient pre-tightening force for the X-ring 8. Through comparative tests, the pre-compression rate of the large O-ring 9 should be greater than that of the small O-ring 10, mainly to provide the serrated structure 7 with sufficient pre-tightening force to fit the surface. The pneumatic base 6 is made of polytetrafluoroethylene material, and the X-ring 8, the large O-ring 9 and the small O-ring 10 are made of rubber material. Due to the high hardness of polytetrafluoroethylene, through comparative tests, the pre-compression rate of the large O-ring 9 should be set at 18%-22%, and the compression rate of the small O-ring 10 should be set at 16%-18%, forming a series pre-compression structure with the X-ring 8, which can further improve the sealing effect of the X-ring 8. Since the pneumatic seal needs to be installed in a closed pneumatic seal groove 11, the pneumatic base 6 needs to be heated and then the seal is installed in the groove through special tooling. The heating temperature needs to be controlled to 80°C-100°C to ensure that the pneumatic base 6 has good ductility and avoid microcrack damage to the seal.

[0047] Furthermore, the self-pressurizing energy storage seal and the combined pneumatic seal can be combined in series and used in working environments that require isolation of high-pressure liquid and high-pressure gas media to achieve an ideal sealing state, wherein the self-pressurizing energy storage seal is arranged on the liquid side and the combined pneumatic seal is arranged on the gas side.

[0048] It should be noted that those skilled in the art can easily understand that the self-pressurizing energy storage seal involved in the present invention can be applied to different types of suspension actuators, and different forms of changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention as defined by the attached claims.

Claims

1. A self-pressurizing energy storage seal, characterized in that: It comprises: a sealed shaft (1), a dovetail-shaped jacket (2), a V-shaped spring (3), a triangular block (4) and a sealing cavity (5); The dovetail jacket (2) is wrapped around the outer periphery of the sealed shaft (1) and is placed together inside the sealing cavity (5). The front end of the dovetail jacket (2) is open and a V-shaped spring (3) is installed. A boss is designed at the open end of the dovetail jacket (2) to limit the V-shaped spring (3). The tail of the dovetail jacket (2) is designed as a dovetail-type scissor-type groove, and the triangular block (4) is installed therein, and is in a clearance fit state under no pressure.

2. The self-pressurizing energy storage seal according to claim 1, characterized in that: In the absence of pressure, the gap is in a clearance fit state, and the gap between the dovetail jacket (2) and the triangular block (4) is set to 0.3mm-0.5mm.

3. The self-pressurizing energy storage seal according to claim 1, characterized in that: The front end cone angle of the triangular block (4) is set to 60°±5° in a normal state, and the front end cone angle is set to deform to 120°±5° when the dovetail jacket (2) and the triangular block (4) are in a completely contacted and pressed state.

4. The self-pressurizing energy storage seal according to claim 3, characterized in that: The dovetail jacket 2 is made of polyurethane material, and the Shore hardness is set between 80 degrees and 90 degrees.

5. The self-pressurizing energy storage seal according to claim 4, characterized in that: The triangular block (4) is made of a soft nitrile rubber material, and the Shore hardness is set between 60 degrees and 70 degrees.

6. The self-pressurizing energy storage seal according to claim 5, characterized in that: The contact threshold pressure between the dovetail jacket (2) and the triangular block (4) is set to 20 MPa.

7. The self-pressurizing energy storage seal according to claim 6, characterized in that: During assembly, first install the V-shaped spring (3) into the front end opening of the dovetail jacket (2) and position it properly, clamp the boss at the open end of the dovetail jacket (2), then embed the triangular block (4) into the dovetail groove at the tail of the dovetail jacket (2), and then assemble the whole into the open sealing groove between the sealing shaft 1 and the sealing cavity (5).

8. The self-pressurizing energy storage seal according to claim 7, characterized in that: In actual use, the opening direction of the dovetail jacket (2) faces the sealed fluid, and there is no pressure on the back side. The sealed fluid will push the dovetail jacket (2) to move towards the triangular block (4) until it fits tightly, eliminating the gap between the two. As the pressure of the sealed fluid increases, the triangular block (4) deforms under pressure, and the cone angle at its front end will open the dovetail jacket (2), so that the dovetail contacts the sealing wall.

9. The self-pressurizing energy storage seal according to claim 8, characterized in that: This contact effect only occurs when the pressure reaches a certain level, and the greater the pressure, the stronger the contact force, which improves the sealing ability of the sealing system. Based on the experience in actual use, the contact threshold pressure is designed to 20Mpa, and the specific structural parameter design is completed through finite element analysis.

10. The self-pressurizing energy storage seal according to claim 9, characterized in that: The dovetail jacket (2) presses the triangular block (4) under the action of fluid pressure, and the triangular block (4) is significantly deformed under the influence of the load, which is manifested in that the front end cone angle of the triangular block (4) increases, the height decreases, and the width increases, which in turn causes the dovetail part of the dovetail jacket 2 to be stretched open and contact the sealing wall surface, forming a new channel to prevent fluid leakage, thereby increasing the sealing ability of the seal; the increase in the sealing ability is related to the deformation of the triangular block (4), and further to the pressure of the sealing fluid, that is, the greater the fluid pressure, the stronger the sealing ability of the seal, thereby achieving a self-tightening seal.

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