Sealing assembly convenient to disassemble and quantitative cylinder

Abstract

The utility model relates to the technical field of sealing of a free gap between a cylinder and a plunger, in particular to a sealing assembly convenient to disassemble, which comprises a sealing sleeve axially provided with at least two sealing elements, a flange is fixed on the sealing sleeve, the end face of the flange is provided with a disassembling threaded hole penetrating through the flange, and the disassembling threaded hole is axially parallel to the sealing sleeve. The flange can abut against a matching end face arranged on the end portion of the cylinder body. The quantitative cylinder comprises a cylinder body and a plunger and further comprises the sealing assembly convenient to disassemble, and the sealing assembly convenient to disassemble is used for sealing the free gap between the cylinder body and the plunger. According to the scheme, the problem that in the prior art, the sealing assembly is difficult to disassemble from the end of the cylinder body is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing a free gap between a cylinder and a plunger, and in particular to a sealing component and a metering cylinder which are convenient to disassemble. Background Art

[0002] In the pumping of fluid, the reciprocating piston in the cylinder body drives the volume change of the cylinder body to realize the filling and discharging of the cylinder body, and the pumping of fluid is realized in the reciprocating cycle of filling and discharging. The movement of the piston needs to be driven by the plunger (plunger is also called "piston rod"), and most of the drivers that drive the movement of the plunger are installed outside the cylinder body, so that the plunger also needs to pass through the end of the cylinder body. In order to ensure that the fluid in the cylinder body does not leak from the free gap between the plunger and the cylinder body during the reciprocating movement of the plunger, a sealing assembly needs to be fixedly installed at the end of the cylinder body.

[0003] The existing sealing assemblies all include a sealing sleeve and at least two sealing members installed inside the sealing sleeve, and the sealing members are arranged along the axial direction of the plunger to form a layered seal in the axial direction. In order to ensure the sealing performance of the sealing assembly, the sealing sleeve is embedded in the end of the cylinder body, and a sealing ring is arranged between the sealing sleeve and the end of the cylinder body. Although this ensures the sealing, the sealing sleeve is embedded in the end of the cylinder body, and the inner wall of the sealing sleeve is a circular hole wall, which makes it difficult to apply external force on the sealing sleeve, and the difficulty of disassembling the sealing sleeve increases. In addition, the sealing ring is squeezed between the sealing sleeve and the end of the cylinder body, which makes the friction resistance during disassembly very large. In addition, in order to improve the sealing performance, the sealing assembly often installs 2-3 sealing members in the axial direction, which also extends the length of the sealing sleeve. On the basis of the inconvenience of applying force to the sealing sleeve itself, the friction resistance and the extended length of the sealing sleeve further increase the difficulty of disassembly, especially for the case where the sealing assembly itself is in a split state (such as the sealing assembly in the patent publication number CN117443678A), the complexity and difficulty of disassembly are more prominent. Utility Model Content

[0004] The utility model aims to provide a sealing component which is easy to disassemble, so as to solve the problem that it is difficult to disassemble the sealing component from the end of a cylinder body in the prior art.

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

[0006] A sealing assembly that is easy to disassemble comprises a sealing sleeve with at least two sealing members axially mounted thereon, a flange being fixed to the sealing sleeve, a disassembly threaded hole penetrating the flange being provided on the flange end face, the disassembly threaded hole being parallel to the axial direction of the sealing sleeve, and the flange being able to abut against a matching end face provided on the end of a cylinder body.

[0007] The principle and advantage of this solution are: when this solution is adopted, by providing a disassembly threaded hole on the sealing sleeve, when it is necessary to disassemble the sealing sleeve with the seal as a whole from the end of the cylinder body, it is only necessary to screw a screw whose length is much longer than the flange into the disassembly threaded hole, and then screw the screw. After the screw contacts 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 disassembling the sealing assembly.

[0008] 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.

[0009] 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.

[0010] Preferably, as an improvement, the sealing sleeve is provided with an installation groove, an isolation ring is provided in the installation groove, the clamping piece abuts against the isolation ring and the isolation ring abuts against the bottom of the installation groove, and the integral structure formed by the sealing sleeve and the isolation ring is provided with at least two sealing grooves distributed along the axial direction on the inner hole wall, a seal is installed in each sealing groove, and adjacent sealing grooves are separated by an isolation ring.

[0011] Beneficial effect: In the existing sealing assemblies, the sealing assemblies are mostly separated by adjacent seals through a support ring sleeved in a sealing sleeve, such as "A high-pressure plunger multi-sealing structure of a plunger pump" with patent announcement number CN217300872U and "A high-pressure plunger multi-sealing structure of a plunger pump" with patent announcement number CN212429735U. Although this existing multi-sealing structure has multiple seals, in actual use, the effective sealing time of the sealing assembly is very short when the pressure in the cylinder is high and the pumped fluid contains abrasive particles.

[0012] After the inventors tried to design and test the material, structure, number of sealing layers and other aspects of the seal, they finally found the reason why the existing multiple sealing components fail quickly. The reason is analyzed as follows: in the current multiple seals, although adjacent seals are separated by support rings (also called isolation rings or guide rings), all seals and support rings are installed in the same annular space; when the cylinder body is in a high pressure state, the high-pressure fluid will give the sealing assembly an axial extrusion force toward the outside of the cylinder body, and this extrusion force will be transmitted to the seals and support rings located in the same annular space. The support ring is made of hard material, but the seal has Elasticity causes the seal to withstand axial extrusion pressure for a long time, and the seal that is farther away from the middle of the cylinder body is subjected to excessive axial extrusion pressure, causing the seal that was originally the last seal to fail before other seals, greatly reducing the sealing effect; and after the last seal fails, the axial space between the seal and the support ring in the annular space increases, and more fluid will be squeezed into the sealing assembly, thereby increasing the wear rate of the seal under the reciprocating movement of the plunger, making it impossible to solve the problem of unsatisfactory sealing performance under multiple seals no matter how to replace better quality seals and ensure the stability / coaxiality of the reciprocating movement of the plunger.

[0013] The present invention arranges the mounting groove and the isolating ring so that the isolating ring itself is pressed in the mounting groove by the pressing member, thereby ensuring that the position of the isolating ring relative to the sealing sleeve in the sealing assembly is fixed. After the position is fixed, each sealing groove provided in the overall structure formed by the isolating ring and the sealing sleeve is an independent space, that is, an independent space is provided for each seal, thereby avoiding the situation where axial extrusion force exists between adjacent seals under fluid pressure, ensuring that each seal can play a maximum sealing role, ensuring that the axial multiple seals can truly play a role, improving the sealing performance, and extending the service life of the sealing assembly.

[0014] Preferably, as an improvement, the isolation ring includes an annular protrusion, an abutment tube fixedly connected to the annular protrusion and perpendicular to the annular protrusion, the annular protrusion and the abutment tube enclose the sealing groove, adjacent sealing grooves are separated by the annular protrusion, and the abutment tube is used to abut between the mounting groove and the clamping piece.

[0015] Beneficial effect: When this solution is adopted, the structural design of the isolation ring itself takes into account both the formation of the sealing groove and the relative fixation of the isolation ring in the sealing sleeve.

[0016] Preferably, as an improvement, the sealing sleeve is provided with a stepped groove with a step, the minimum step of the stepped groove forms an annular space for installing the seal, and the remaining steps of the stepped groove form the installation groove. This solution can increase the installation space of a seal through the design of the stepped groove and meet the installation requirements of the isolation ring.

[0017] Preferably, as an improvement, the number of the isolation rings is at least 2, one of which has an oil-passing structure, and the sealing sleeve is provided with an oil-passing channel, which is connected to the oil-passing structure so that lubricating oil can enter the sealing assembly.

[0018] Preferably, as an improvement, the oil-passing structure is located between adjacent sealing elements.

[0019] Beneficial effect: This solution allows the lubricating oil to penetrate axially after entering the sealing assembly as the plunger moves axially, making it easier for the lubricating oil to reach the gap between the seal and the plunger at a faster speed, helping to reduce the wear rate of the seal, thereby further extending the durability of the sealing assembly.

[0020] Preferably, as an improvement, a sealing ring is provided between the outer periphery of the isolation ring and the inner wall of the sealing sleeve.

[0021] Beneficial effect: When this solution is adopted, a sealing ring is arranged between the outer periphery of the isolation ring and the inner wall of the sealing sleeve. Therefore, even under high pressure of the cylinder body, when the fluid tends to move to the position where the isolation ring and the sealing sleeve are in contact, the sealing ring can block the axial penetration of the fluid, thereby reducing the solidification length between the fluid isolation ring and the sealing sleeve and reducing the difficulty of disassembling the isolation ring.

[0022] In addition, the sealing ring between the outer periphery of the isolation ring and the inner wall of the sealing sleeve can prevent the lubricating oil entering the oil-passing structure from easily entering between the outer periphery of the isolation ring and the inner wall of the sealing sleeve, thereby ensuring that the lubricating oil enters between the seal and the plunger along the oil-passing structure, thereby improving the lubrication effect and efficiency.

[0023] Preferably, as an improvement, the isolation ring is provided with a chamfer, and the space between the chamfer and the plunger faces the sealing lip of the sealing element.

[0024] Beneficial effect: The chamfer setting of this scheme enables the inner hole of the isolation ring to be designed as small as possible while ensuring intermittent cooperation with the plunger, so as to provide sufficient support for the bottom of the seal. The chamfer setting also ensures that the size design of the isolation ring does not affect the normal sealing function of the seal.

[0025] The utility model also provides a metering cylinder, comprising a cylinder body, a plunger, and also comprising the conveniently disassembled sealing assembly, wherein the conveniently disassembled sealing assembly is used for sealing the free gap between the cylinder body and the plunger.

[0026] Preferably, as an improvement, the cylinder body comprises a cylinder barrel and an end seat detachably connected to the end of the cylinder barrel, the end seat is provided with a stepped groove, and the sealing sleeve is embedded in the stepped groove.

[0027] Beneficial effects: When this solution is adopted, the sealing sleeve is embedded in the end seat, so that the sealing component can form a whole with the end seat of the cylinder body, so that it is convenient to directly remove the end seat of the cylinder body and then disassemble and assemble the sealing component separately. In addition, the setting of the stepped groove increases the assembly stability of the sealing component in the end seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model.

[0029] Figure 2 for Figure 1 Top view of the .

[0030] Figure 3 for Figure 2 AA section view.

[0031] Figure 4 This is a longitudinal sectional view of the sealing assembly of the first embodiment placed in the end of the cylinder body (including the plunger).

[0032] Figure 5 for Figure 4 A partial schematic diagram of .

[0033] Figure 6 The first embodiment is a cross-sectional view showing the lubricating oil circuit portion.

[0034] Figure 7 This is a cross-sectional view of the first embodiment showing the relationship between the clamping member and the inlet and outlet holes at the end of the cylinder body.

[0035] Figure 8 It is a longitudinal sectional view of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0036] The following is further described in detail through specific implementation methods:

[0037] The figure marks in the drawings of the specification include: cylinder end 10, oil delivery channel 101, inlet and outlet holes 102, plunger 20, flange 30, sealing sleeve 1, disassembly threaded hole 11, oil passage 12, oil ring groove 13, sealing member 2, isolation ring 3, oil inlet channel 31, oil inlet ring groove 32, oil inlet ring cavity 33, clamping member 4, clamping block 1 41, clamping block 2 42, guide sleeve 5, cylinder barrel 100, sealing assembly 200.

[0038] Embodiment 1

[0039] Combination Figures 1 to 7A sealing assembly that is easy to disassemble is used to seal the free gap between the cylinder end 10 and the plunger 20, mainly including a sealing sleeve 1, at least two sealing members 2 (the number of sealing members 2 in this embodiment is three), two isolation rings 3, a clamping member 4 and a wear-resistant guide sleeve 5, wherein the sealing members 2 in this embodiment are all made of universal plugs, and the guide sleeve 5 is made of Sildenafil rings.

[0040] A stepped groove with two steps is processed on the sealing sleeve 1. The small step of the stepped groove forms an annular space for installing the seal 2, and the large step of the stepped groove forms a mounting groove for the isolation ring 3. Two isolation rings 3 are stacked in the mounting groove, and the clamping piece 4 presses the two stacked isolation rings 3 against the bottom of the mounting groove.

[0041] Each isolation ring 3 is made of metal and includes an integrally formed annular protrusion and an abutment tube. The annular protrusion is perpendicular to the abutment tube, and the abutment tube is parallel to the plunger 20. The annular protrusion and the abutment tube enclose a sealing groove for installing the seal 2. Adjacent sealing grooves are separated by the annular protrusion. The abutment tube is used to press the clamping member 4 against the installation groove.

[0042] The annular protrusion is processed with a chamfer, and the space between the chamfer and the plunger 20 faces the sealing lip of the sealing member 2 .

[0043] One of the isolation rings 3 is provided with an oil-passing structure, and the oil-passing structure is located between adjacent seals 2. An oil-passing channel 12 is provided on the sealing sleeve 1, and the oil-passing channel 12 is connected to the oil-passing structure so that lubricating oil can enter the sealing assembly. The oil-passing structure on the isolation ring 3 in this embodiment can be an oil-passing structure for lubrication as in patent announcement number CN212429735U or CN217300872U, or can be specifically designed as follows: the isolation ring 3 with the oil-passing structure includes a plurality of circumferentially arranged oil inlet channels 31, and the oil inlet channels 31 are radially arranged along the isolation ring 3. An oil inlet ring groove 32 is provided at the oil inlet end of the oil inlet channel 31, and the oil outlet end of the oil inlet channel 31 is opposite to the chamfer, and an oil inlet ring cavity 33 is formed between the conical surface formed by the chamfer and the plunger 20; the oil-passing channel 12 and the oil-passing ring groove 13 are processed on the sealing sleeve 1, There are multiple oil passages 12, and the oil passages 12 are radially arranged. One end of the oil passage 12 is connected to the oil ring groove 13, and the other end is connected to the oil inlet ring groove 32. In order to ensure the lubrication of the sealing component installed at the cylinder end 10, an oil delivery channel 101 is opened at the cylinder end 10, and the oil delivery channel 101 is connected to the oil ring groove 13. Lubricating oil is injected into the oil ring groove 13 through the oil delivery channel 101, so that the lubricating oil passes through the oil passage 12, the oil inlet ring groove 32, and the oil inlet passage 31, and finally enters the oil inlet ring cavity 33, so as to realize the lubrication of the sealing component 2 and the plunger 20, thereby reducing wear.

[0044] In order to ensure that the lubricating oil moves to the oil inlet ring cavity 33, sealing rings are arranged on both sides of the oil passage 12 of the sealing sleeve 1. The sealing rings are sleeved on the outer circumference of the sealing sleeve 1 and are O-type sealing rings.

[0045] In order to prevent lubricating oil from entering between the sealing sleeve 1 and the isolating ring 3, a sealing ring is also arranged between the outer periphery of the isolating ring 3 and the inner wall of the sealing sleeve 1, and the sealing ring is an O-type sealing ring.

[0046] A flange is integrally formed on the sealing sleeve 1, and a disassembly threaded hole 11 penetrating the flange is processed on the end face of the flange. The disassembly threaded hole 11 is parallel to the axial direction of the sealing sleeve 1, and the matching end faces provided on the flange and the cylinder end 10 can abut against each other, so that when the sealing sleeve 1 needs to be disassembled, it is only necessary to screw a screw whose length is much greater than the flange into the disassembly threaded hole 11, and tighten the screw. After the screw abuts against the matching end face, continued tightening of the screw will drive the sealing sleeve 1 to move along the axial direction of the screw, thereby realizing labor-saving disassembly of the sealing sleeve 1 and greatly reducing the difficulty of disassembly of the sealing assembly.

[0047] The flange of the sealing sleeve 1 is located between the pressing member 4 and the end of the cylinder body. The pressing member 4 is provided with an escape area for avoiding the disassembly threaded hole 11. When disassembly is required, the pressing member 4 only needs to be removed first to expose the disassembly threaded hole 11, and the sealing sleeve 1 can be disassembled at the cylinder end 10. At the same time, the pressing member 4 is also directly fixed to the cylinder end 10 by bolts, and an escape area is provided on the flange to avoid the installation screws of the pressing member 4, so that the pressing member 4 can press the sealing sleeve 1 and press it against the cylinder end 10.

[0048] In this embodiment, in order to ensure that the installation of the clamping piece 4 does not affect the fluid inlet and outlet hole 102 set at the cylinder end 10, the clamping piece 4 is configured as a clamping block 1 41 and a clamping block 2 42 to avoid the fluid inlet and outlet hole 102, and the clamping block 1 41 and the clamping block 2 42 are both connected to the cylinder end 10 by screws.

[0049] An annular groove is provided at one end of the sealing sleeve 1 away from the cylinder body, and a guide sleeve 5 is installed in the annular groove. The guide sleeve 5 is used to guide the axial movement of the plunger 20 to assist the smooth movement of the plunger 20 and reduce unnecessary wear.

[0050] Embodiment 2

[0051] Combination Figure 8The second embodiment provides a metering cylinder, including a cylinder body, a plunger 20, and the easily disassembled sealing assembly 200 of the first embodiment. The easily disassembled sealing assembly 200 is used to seal the free gap between the cylinder body and the plunger 20. The cylinder body includes a cylinder barrel 100 and an end seat detachably connected to the end of the cylinder barrel 100. The end seat forms the cylinder body end 10 in the first embodiment. In this embodiment, a protrusion is formed at the end of the cylinder barrel 100. A flange 30 is sleeved on the cylinder barrel 100. One section of the protrusion abuts against the flange 30, and the other side section of the protrusion abuts against the end seat. The flange 30 and the end seat are fixedly connected by bolts.

[0052] In this embodiment, a stepped groove is provided on the end seat, and the sealing assembly 200 is integrally embedded in the stepped groove, specifically, the sealing sleeve 1 is embedded in the stepped groove, and a sealing ring is provided between the outer periphery of the sealing sleeve 1 and the inner wall of the end seat to further improve the sealing effect of the sealing assembly 200. The pressing member 4 is threadedly connected to the stepped surface of the end seat by a screw.

[0053] This embodiment applies the sealing assembly 200 to the metering cylinder, which greatly improves the sealing performance of the metering cylinder and greatly extends the service life of the sealing assembly 200 compared with the prior art, greatly reduces the parts replacement cost of the metering cylinder, and helps to ensure production efficiency.

[0054] 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. A sealing assembly that is easy to disassemble, comprising a sealing sleeve on which at least two sealing members are axially mounted, a flange being fixed on the sealing sleeve, characterized in that: The flange end surface is provided with a disassembly threaded hole penetrating the flange, the disassembly threaded hole is parallel to the axial direction of the sealing sleeve, and the flange and the matching end surface provided on the cylinder end can be abutted.

2. A sealing assembly that is easy to disassemble according to claim 1, 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.

3. A sealing assembly that is easy to disassemble according to claim 2, characterized in that: The sealing sleeve is provided with an installation groove, in which an isolation ring is provided, the clamping piece abuts against the isolation ring and the isolation ring abuts against the bottom of the installation groove, and the integral structure formed by the sealing sleeve and the isolation ring is provided with at least two sealing grooves distributed along the axial direction on the inner hole wall, a sealing element is installed in each sealing groove, and adjacent sealing grooves are separated by an isolation ring.

4. A sealing assembly with easy disassembly according to claim 3, characterized in that: The sealing sleeve is provided with a stepped groove with steps, the minimum step of the stepped groove forms an annular space for installing the sealing member, and the remaining steps of the stepped groove form the installation groove.

5. The sealing assembly with easy disassembly according to claim 3, characterized in that: The number of the isolation rings is at least 2, one of which is provided with an oil-passing structure, and the sealing sleeve is provided with an oil-passing channel, which is connected with the oil-passing structure so as to allow lubricating oil to enter the sealing assembly.

6. The sealing assembly with easy disassembly according to claim 5, characterized in that: The oil-passing structure is located between adjacent sealing elements.

7. The sealing assembly with easy disassembly according to claim 6, characterized in that: A sealing ring is arranged between the outer periphery of the isolation ring and the inner wall of the sealing sleeve.

8. The sealing assembly with easy disassembly according to claim 7, characterized in that: The isolating ring is provided with a chamfer, and the space between the chamfer and the plunger faces the sealing lip of the sealing element.

9. A metering cylinder, comprising a cylinder body and a plunger, characterized in that: It also includes a sealing assembly that is easy to disassemble as described in any one of claims 1 to 8, and the sealing assembly that is easy to disassemble is used to seal the free gap between the cylinder body and the plunger.

10. A metering cylinder according to claim 9, characterized in that: The cylinder body comprises a cylinder barrel and an end seat detachably connected to the end of the cylinder barrel, a stepped groove is arranged on the end seat, and a sealing sleeve is embedded in the stepped groove.

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