Internal and external multi-layer sealing type sealing assembly

Abstract

The utility model relates to the technical field of sealing of a free gap between a cylinder and a plunger, and particularly discloses an inner and outer multi-layer sealing type sealing assembly which comprises a sealing sleeve, at least two first sealing rings are arranged on the inner side, close to the plunger, of the sealing sleeve in the axial direction, an isolating ring is arranged on the inner side of the sealing sleeve in a sleeved mode, and the first sealing rings are installed on the inner wall of the isolating ring. A second sealing ring is arranged between the periphery of the isolating ring and the inner wall of the sealing sleeve; a flange is fixed on the sealing sleeve, the end face of the flange is provided with a dismounting through hole which penetrates through the flange and is provided with threads, the dismounting through hole is axially parallel to the sealing sleeve, and the flange can abut against a matching end face arranged on the end portion of the cylinder body. The hydraulic cylinder further comprises a pressing piece, the pressing piece is detachably connected to the end of the cylinder body, and the flange of the sealing sleeve is located between the pressing piece and the matched end face of the end of the cylinder body. According to the scheme, the staying amount of fluid in a gap is reduced by optimizing the structure of the sealing assembly, and therefore the disassembly difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing the free gap between a cylinder and a plunger, in particular to an inner and outer multi-layer sealing type sealing component. Background Art

[0002] In many industrial applications, the sealing system composed of the cylinder and the plunger is the key to ensure the normal operation of the pumping equipment. However, when the pressure in the cylinder is too high, the fluid can easily penetrate into the tiny gaps of the sealing component under high pressure, causing the sealing component to wear and fail. Especially when the fluid in the cylinder contains solid abrasive particles (such as thermal conductive glue), it will aggravate the wear of the seal and have a greater impact on the service life of the sealing component.

[0003] In the prior art, although there are solutions for using multi-layer sealing rings to enhance the sealing effect, these enhanced sealing settings are often concentrated on the seal between the sealing assembly and the plunger (the plunger is also called a "piston rod"), such as a high-pressure plunger multi-sealing structure of a plunger pump with patent announcement number CN217300872U, and another example, a high-pressure plunger multi-sealing structure of a plunger pump with patent announcement number CN212429735U, while ignoring the gap sealing between the parts of the sealing assembly itself, which causes the fluid to be squeezed into the gap between the parts of the sealing assembly under the high pressure of the cylinder body, and solidified in the gap under the long-term use of the sealing assembly. Once the gap is filled, it will make the parts of the sealing assembly more difficult to disassemble. Utility Model Content

[0004] The utility model is intended to provide an inner and outer multi-layer sealing type sealing component, aiming to reduce the amount of fluid retained in the gap by optimizing the sealing component structure, thereby reducing the difficulty of disassembly.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses an inner and outer multi-layer sealing assembly, comprising a sealing sleeve, wherein at least two first sealing rings are axially arranged on the inner side of the sealing sleeve close to the plunger, an isolating ring is arranged on the inner side of the sealing sleeve, the first sealing ring is installed on the inner wall of the isolating ring, and a second sealing ring is arranged between the outer periphery of the isolating ring and the inner wall of the sealing sleeve.

[0007] The principles and advantages of this solution are: this solution arranges an isolation ring in the sealing sleeve, and seal rings (first seal ring and second seal ring) are arranged on the inner and outer walls of the isolation ring, and forms a multi-layer barrier seal for the fluid in the axial movement of the plunger through at least two first axial seal rings; even if the fluid flows from the first seal ring to the sealing assembly under high pressure, the sealing action of the second seal ring can prevent the fluid from extending axially along the inner wall of the sealing sleeve, thereby reducing or even avoiding the amount of fluid infiltration into the inner wall of the sealing sleeve or the area of ​​fluid infiltration, thereby reducing the solidification length of the fluid between the isolation ring and the sealing sleeve, and reducing the difficulty of disassembling the isolation ring.

[0008] In addition, the first sealing ring is installed on the inner wall of the isolation ring of the present invention, so that the installation space of the first sealing ring in the isolation ring is fixed, and the first sealing ring in the isolation ring will not be affected by other parts and bear the axial extrusion force from the adjacent parts (in the high-pressure plunger multiple sealing structure of the plunger pump of the prior art CN212429735U, the axial multiple sealing rings are all located in the same installation space with the support ring, so that the sealing ring or the support ring will be transmitted axially after being subjected to force, so that there is axial extrusion force between the sealing ring and the support ring, especially the sealing ring farther away from the cylinder body is subjected to the greatest degree of extrusion, and is also the sealing ring most likely to be damaged by extrusion deformation. After the sealing ring farthest from the cylinder body fails, while reducing one layer of sealing, it will also cause the movement space of other sealing rings to increase, thereby increasing the degree of slippage of the sealing ring under the reciprocating movement of the plunger, and thus more unfavorable for the sealing of the sealing assembly. Often, this type of sealing assembly has the problem of rapid failure when used under a high-pressure cylinder body), ensuring that the first sealing ring plays a sealing role in its respective fixed space, ensuring the reliability of the axial multiple seals, thereby improving the sealing performance and greatly extending the service life of the sealing assembly.

[0009] In addition, the presence of the second sealing member also helps to improve the sealing performance of the sealing assembly to a certain extent.

[0010] Preferably, as an improvement, at least two third sealing rings are axially provided on the outer periphery of the sealing sleeve, and the sealing performance is further improved by providing the third sealing rings.

[0011] Preferably, as an improvement, a flange is fixed on the sealing sleeve, and a threaded disassembly through hole is provided on the end face of the flange, the disassembly through hole is parallel to the axial direction of the sealing sleeve, and the flange and the matching end face provided on the end of the cylinder body can abut against each other.

[0012] Beneficial effect: When the present solution is adopted, a threaded disassembly through hole is provided on the sealing sleeve, so that when the sealing sleeve with the first sealing ring and the second sealing ring needs to be disassembled as a whole from the end of the cylinder body, it is only necessary to screw a screw whose length is much greater than the flange into the disassembly through hole, and after the screw is screwed and abuts against the mating end surface, continued screwing of the screw will drive the sealing sleeve to move along the axial direction of the screw, thereby realizing labor-saving disassembly of the sealing sleeve and greatly reducing the difficulty of disassembly of the sealing assembly.

[0013] Preferably, as an improvement, it further comprises a pressing piece, which is detachably connected to the end of the cylinder body, and the flange of the sealing sleeve is located between the matching end surfaces of the pressing piece and the end of the cylinder body.

[0014] Beneficial effects: On the one hand, the pressing piece fixes the sealing member on the sealing sleeve, and on the other hand, the setting of the pressing piece enables the pressing piece to not only achieve its own fixed installation but also fix the sealing sleeve on the end of the cylinder body while pressing the flange.

[0015] Preferably, as an improvement, the pressing member is provided with an escape space for avoiding the inlet and outlet holes on the cylinder body.

[0016] Beneficial effect: The existence of the air-avoiding space in this solution ensures that the existence of the clamp does not affect the inlet and outlet paths of the fluid inlet and outlet holes on the cylinder body, thereby ensuring that the increase of the clamp does not lead to an increase in the size of the cylinder body end.

[0017] Preferably, as an improvement, the sealing sleeve is provided with a stepped groove, the minimum step of the stepped groove is used for installing a first sealing ring, and the remaining steps of the stepped groove are used for installing an isolation ring.

[0018] Beneficial effect: The setting of the stepped groove enables a first sealing ring to be directly installed in the sealing sleeve, thereby reducing the number of isolation rings required when achieving multiple sealing of the same level. For example, if three levels of sealing are required, two isolation rings are sufficient. The setting of the remaining steps enables the isolation ring to always be installed in the limited space of the sealing sleeve and will not generate axial extrusion force on the first sealing ring directly installed on the sealing sleeve.

[0019] Preferably, as an improvement, at least one of the isolating rings is provided with an oil passing structure, and the sealing sleeve is provided with an oil passing channel, and the oil passing channel is connected to the oil passing structure.

[0020] Beneficial effect: Lubrication between the sealing component and the plunger is achieved through the oil-through structure and the oil-through channel.

[0021] Preferably, as an improvement, a conical surface is provided on the inner wall of the isolation ring with the oil-passing structure, and a conical oil inlet ring cavity is formed between the conical surface and the plunger.

[0022] Beneficial effect: The existence of the oil inlet ring cavity makes the oil inlet ring cavity form an oil storage space for lubricating oil, which is convenient for timely replenishment of lubricating oil. In addition, the tapered ring cavity guides the movement of lubricating oil, which helps the lubricating oil to penetrate faster along the axial direction under the pressure of the continuously supplied lubricating oil.

[0023] Preferably, as an improvement, the oil-passing structure is located between two adjacent first sealing rings, so that after the lubricating oil enters the sealing assembly, it penetrates axially faster as the plunger moves axially, and reaches the gap between the first sealing ring and the plunger at a faster speed, which helps to reduce the wear rate of the first sealing ring, thereby further extending the durability of the sealing assembly.

[0024] Preferably, as an improvement, a third sealing ring is provided on both sides of the oil passage, so that the third sealing ring can form a seal on both sides of the oil passage.

[0025] Preferably, as an improvement, a guide sleeve is further installed on the sealing sleeve, which guides the axial movement of the plunger to improve the movement stability of the plunger, thereby helping to reduce wear and extend the service life of the sealing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the utility model.

[0027] Figure 2 for Figure 1 Top view of the .

[0028] Figure 3 for Figure 2 AA section view.

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the sealing assembly of the embodiment of the utility model after being installed on the end cover at the end of the cylinder body.

[0030] Figure 5 for Figure 4 Axial cross-sectional view after matching with the pump upper cylinder, end cover, plunger and flange.

[0031] Figure 6 for Figure 5 A partial picture of .

[0032] Figure 7 The embodiment of the present invention is a cross-sectional view showing a lubrication oil circuit portion (the plunger is not shown).

[0033] Figure 8 This is a cross-sectional view of an embodiment of the utility model showing the relationship between the pressing member and the inlet and outlet holes on the end cover. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: cylinder body 10, plunger 20, flange 30, sealing sleeve 1, disassembly hole 11, oil passage 12, oil ring groove 13, first sealing ring 2, isolation ring 3, oil inlet passage 31, oil inlet ring groove 32, oil inlet ring cavity 33, second sealing ring 4, end cover 5, oil delivery passage 51, third sealing ring 6, clamping piece 7, clamping block 1 71, clamping block 2 72, guide sleeve 8, inlet and outlet hole 40.

[0036] The embodiment is basically as shown in the attached Figures 1 to 8 shown.

[0037] An inner and outer multi-layer sealing assembly is used to be installed on the end cover 5 of the cylinder body 10 of the pump body, mainly comprising a sealing sleeve 1, at least two first sealing rings 2 (the number of first sealing rings 2 in this embodiment is three), two isolation rings 3, two second sealing rings 4, two third sealing rings 6, a clamping piece 7 and a guide sleeve 8. In this embodiment, the first sealing ring 2 adopts a universal plug, and the second sealing ring 4 and the third sealing ring 6 both adopt O-rings.

[0038] A receiving groove for installing the first sealing ring 2 is provided on the inner wall of each isolation ring 3, and a receiving groove for installing the second sealing ring 4 is provided on the outer wall of each isolation ring 3. The inner hole of the sealing sleeve 1 is stepped, and one of the first sealing rings 2 is installed on the stepped small hole of the sealing sleeve 1. Two isolation rings 3 with the first sealing ring 2 and the second sealing ring 4 are sequentially mounted on the stepped large hole of the sealing sleeve 1, so that the three first sealing rings 2 are distributed along the axial direction of the sealing sleeve 1, and a three-level seal between the sealing assembly and the plunger 20 is formed through the three first sealing sleeves 1.

[0039] At the same time, the gap between the isolating ring 3 and the sealing sleeve 1 is sealed by the two second sealing rings 4 .

[0040] An annular groove is provided at one end of the sealing sleeve 1 away from the cylinder body 10, in which a wear-resistant guide sleeve 8 is installed. The guide sleeve 8 is used to guide the axial movement of the plunger 20 to assist the smooth movement of the plunger 20 and reduce unnecessary wear.

[0041] A stepped groove is designed inside the end cover 5, and the sealing sleeve 1 is embedded in the stepped groove to increase the stability of the assembly. A flange is integrally formed on the side of the sealing sleeve 1 close to the cylinder body 10. The sealing sleeve 1 is located between the clamping piece 7 and the end cover 5. The clamping piece 7 and the end cover 5 are detachably connected by bolts. Pressure is applied to the sealing sleeve 1 through the clamping piece 7 to ensure the sealing effect. At the same time, the clamping piece 7 is also in contact with the end face of the isolation ring 3 closest to the cylinder body 10, so that the isolation ring 3 is pressed against the stepped large hole of the sealing sleeve 1 through the clamping piece 7.

[0042] In this embodiment, an inlet and outlet hole 40 connected to the inner cavity of the cylinder body 10 is opened on the end cover 5. In order to ensure that the inlet and outlet hole 40 is not obstructed and to reduce the length of the sealing assembly, the clamping piece 7 is designed to have a clamping block 1 71 and a clamping block 2 72 with a certain distance. The distance between the clamping block 1 71 and the clamping block 2 72 forms an escape space to avoid the inlet and outlet hole 40. The clamping block 1 71 and the clamping block 2 72 are both detachably connected to the end cover 5.

[0043] When the sealing assembly is installed, it is detachably connected to the cylinder body 10 through the end cover 5. The specific connection method can be threaded connection or connection through a connecting flange 30. This embodiment takes the flange 30 connection as an example.

[0044] A threaded disassembly through hole is provided on the sealing sleeve 1, and an escape area for avoiding the disassembly through hole is provided on the clamping piece 7. When disassembly is required, it is only necessary to remove the clamping piece 7 first, and then pass the bolt through the disassembly through hole, and let the bolt rest on the stepped end face of the end cover 5. The rotation of the bolt can guide the sealing sleeve 1 to gradually withdraw from the stepped groove of the end cover 5, thereby improving the disassembly and assembly efficiency of the sealing sleeve 1 and simplifying the maintenance process of the sealing assembly.

[0045] In addition, in order to improve the lubrication effect of the sealing assembly, one of the isolation rings 3 is provided with an oil-passing structure, the oil-passing structure includes a plurality of oil inlet channels 31 arranged circumferentially, the oil inlet channels 31 are arranged radially along the isolation ring, an oil inlet ring groove 32 is arranged at the oil inlet end of the oil inlet channel 31, and the oil inlet ring is processed with a conical surface at the oil outlet end of the oil inlet channel 31. After the sealing assembly is sleeved on the plunger 20, an oil inlet ring cavity 33 is formed between the conical surface and the plunger 20, and the oil inlet ring cavity 33 is connected to the oil outlet end of the oil inlet channel 31. An oil-passing channel 12 and an oil-passing ring groove 13 are provided on the sealing sleeve 1. The oil-passing channel 12 is radially arranged, and there are multiple oil-passing channels 12 and they are evenly distributed circumferentially about the sealing sleeve 1. One end of the oil-passing channel 12 is connected to the oil ring groove 13, and the other end is connected to the oil inlet ring groove 32. An oil delivery channel 51 is provided on the end cover 5, and the oil delivery channel 51 is used to supply lubricating oil to the oil inlet channel 31, and the oil delivery channel 51 is connected to the oil ring groove 13; through a simple structural setting, lubrication of the sealing assembly can be achieved, and the lubricating oil enters between the plunger 20 and the sealing assembly from the oil inlet ring cavity 33 with a conical structure, ensuring that the lubricating oil can quickly reach the contact surface between the sealing ring and the plunger 20, thereby improving the lubrication effect and reducing wear.

[0046] Two third sealing rings 6 are arranged on the outer periphery of the sealing sleeve 1 to effectively seal both sides of the oil passage 12 to prevent leakage.

[0047] In summary, this embodiment effectively prevents the penetration of high-pressure fluid by setting multiple sealing rings, significantly improving the reliability and durability of the sealing assembly. The tapered oil inlet ring cavity 33 and design ensure the effective supply of lubricating oil, reduce the wear rate of the first sealing ring 2, and extend the service life. In addition, the design of the disassembly through hole on the sealing sleeve 1 makes the disassembly and assembly of the sealing sleeve 1 simple and quick, reducing the difficulty and cost of maintenance.

[0048] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An inner and outer multi-layer sealing assembly, comprising a sealing sleeve, wherein at least two first sealing rings are axially arranged on the inner side of the sealing sleeve close to the plunger, and characterized in that: An isolation ring is sleeved on the inner side of the sealing sleeve, a first sealing ring is installed on the inner wall of the isolation ring, and a second sealing ring is arranged between the outer periphery of the isolation ring and the inner wall of the sealing sleeve.

2. The inner and outer multi-layer sealing assembly according to claim 1, characterized in that: At least two third sealing rings are axially arranged on the outer periphery of the sealing sleeve.

3. The inner and outer multi-layer sealing assembly according to claim 1, characterized in that: The sealing sleeve is fixed with a flange, and the end face of the flange is provided with a threaded disassembly through hole penetrating the flange, the disassembly through hole is parallel to the axial direction of the sealing sleeve, and the flange and the matching end face provided on the end of the cylinder body can be abutted.

4. The inner and outer multi-layer sealing assembly according to claim 3, characterized in that: It also comprises a pressing piece which is detachably connected to the end of the cylinder body, and the flange of the sealing sleeve is located between the matching end surface of the pressing piece and the end of the cylinder body.

5. The inner and outer multi-layer sealing assembly according to claim 4, characterized in that: The pressing piece is provided with an escape space for avoiding the inlet and outlet holes on the cylinder body.

6. The inner and outer multi-layer sealing assembly according to claim 1, characterized in that: The sealing sleeve is provided with a stepped groove, the minimum step of the stepped groove is used for installing a first sealing ring, and the remaining steps of the stepped groove are used for installing an isolation ring.

7. The inner and outer multi-layer sealing assembly according to claim 2, characterized in that: At least one isolating ring is provided with an oil passing structure, and the sealing sleeve is provided with an oil passing channel, which is communicated with the oil passing structure.

8. The inner and outer multi-layer sealing assembly according to claim 7, characterized in that: The inner wall of the isolation ring with the oil-passing structure is provided with a conical surface, and a conical oil inlet ring cavity is formed between the conical surface and the plunger.

9. The inner and outer multi-layer sealing assembly according to claim 7, characterized in that: The two sides of the oil passage are both provided with third sealing rings.

10. An inner and outer multi-layer sealing assembly according to any one of claims 1 to 9, characterized in that: A guide sleeve is also installed on the sealing sleeve.

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