Integrated semi-solid paste filler sealing device for fluid equipment

Abstract

Provided is an integrated semi-solid paste filler sealing device for fluid equipment. 【Solution means】It includes a sleeve 14 attached around a rotating shaft 12, a lock ring 16, a formed seal ring assembly, a semi-solid paste filler 18, a cylindrical main gland, an annular sub-gland 22, a support skeleton, and one or more removable positioning blocks 34. The positioning blocks are arranged to connect the lock ring to the sub-gland to integrate the sealing device together. The axial support rod is arranged such that the pitch between the first formed seal ring 17a and the second formed seal ring 17b can vary between a minimum pitch and a maximum pitch. The nipple is suitable for being connected to or blocked from the connection port of an external injector. When the nipple is connected to the connection port of the external injector, the filler can be injected into the cylindrical space through the external injector. The filler contributes to an increase in the sealing pressure formed in the cylindrical space. When the nipple is blocked, the sealing pressure can be adjusted through a biasing mechanism 28.

Description

Technical Field

[0001] The present invention relates to fluid sealing technology, and in particular to an integrated semi-solid mud-like filler sealing device for fluid equipment.

Background Art

[0002] In industrial continuous production, it is necessary to transport a large amount of fluids (including gases, mixtures of gases and liquids, and especially liquids) through pumps or other fluid equipment. A pump generally includes a pump housing and a rotating shaft. The rotating shaft passes through the orifice of the pump housing and rotates at a high speed during operation to transport the fluid in the pump housing or increase the pressure of the fluid. Therefore, an effective sealing device is provided between the orifice and the rotating shaft to prevent the leakage of fluid from the orifice and contribute to the safe operation of the pump. Much of the pump's downtime maintenance is for replacing a failed sealing device. In the prior art, the sealing forms of the sealing device include mechanical seals, packing seals, and laminated shear-type filler seals. A mechanical seal is defined in national standards as a fluid leakage prevention device configured such that at least a pair of end faces perpendicular to the rotation axis are relatively slidable while being adhered to each other by the action of fluid pressure and the elastic force or magnetic force of the compensation mechanism and the cooperation of the auxiliary seal.

[0003] The material of the seal ring of the mechanical seal is a rigid material, which has a good sealing effect, a long service life, high requirements for use and processing accuracy, is expensive, and is troublesome to maintain and replace. The packing seal is to press the packing by a fixing member to cause plastic deformation of the packing to generate a radial force and closely contact the shaft for sealing. The old packing seal wore the shaft and needed to be washed with water, and there was also a small amount of leakage, but the sealing method was inexpensive and easy to maintain and replace. Subsequently, for example, like the integrated filler seal structure disclosed in Patent Publication CN114688073A, a sleeve was added to solve the problem of shaft wear, and the sleeve, packing, and gland were connected in the radial direction and assembled integrally to be easily replaceable. However, these improvements do not solve the problem that frequent downtime and replacement of the packing seal are required due to a large wear amount and a short service cycle.

[0004] Chinese Patent CN201875137U Publication and Chinese Patent CN215672853U Publication disclose a layered shear seal for pumps. The seal disclosed in Chinese Patent CN215672853U adopts spacers for the bottom rings at both ends and fills a semi-solid filler seal in the middle.

[0005] In addition, the pressure resistance performance of the seal filler is improved by adding a framework inside or outside the filler. Compared with the packing seal technology, the laminated shear type filler seal technology has the advantages of not wearing the shaft, not requiring washing with water, having no specification limitations, being able to perform on-line maintenance, and being convenient for installation. The sealing mechanism of the laminated shear filler or the muddy filler realizes sealing through the internal layers of the seal filler. Among them, some fillers need to tightly wrap the rotating shaft and rotate with the shaft. When inspecting the equipment, this part of the filler cannot be completely and neatly removed from the shaft or reused repeatedly, and often needs to be subjected to destructive decomposition. After inspecting, maintaining, and replacing other mechanical parts of the equipment, the filler needs to be replaced again to restore the seal, that is, it increases the cost of equipment operation and the efficiency and cost of equipment inspection. In addition, the conventional framework technology can only solve the problem of resisting shrinkage under external pressure, and when pressurizing and replenishing the filler during on-line maintenance, it still cannot solve the problems of overheating and expansion of the filler due to the accumulation of internal pressure, and even seal burnout.

[0006] With the development of modern industrial technology, the mechanical seal form has been adopted for fluid transportation equipment in a relatively good operating state. However, for fluid transportation equipment in a relatively poor operating state, it is still necessary to adopt the packing seal or the laminated shear type filler seal form. The fluid in a relatively poor operating state contains a lot of sediment or impurity particles. When these sediment or impurity particles penetrate into the sealing surface, the wear of the rotating shaft and the packing or filler progresses, the sealing effect is impaired, the sealing operation life is greatly reduced, and the sealing inspection frequency increases.

Summary of the Invention

Problems to be Solved by the Invention

[0007] One object of the present invention is to provide an improved integrated semi-solid muddy filler seal device for fluid equipment.

Means for Solving the Problems

[0008] According to one aspect of the present invention, there is provided an integrated semi-solid paste filler sealing device for fluid equipment for sealing a rotating shaft passing through an orifice of an equipment housing so that the fluid in the equipment housing does not leak from the orifice, comprising a sleeve attached around the rotating shaft, a lock ring, a formed seal ring assembly, a semi-solid paste filler, a cylindrical main gland, an annular auxiliary gland, a support skeleton, and one or more removable positioning blocks. The tip of the cylindrical main gland forms a main gland cylinder, and the rear end of the cylindrical main gland forms a main gland step extending outwardly with respect to the main gland cylinder. The main gland step is fastened to the rear end surface around the orifice of the equipment housing, and when the main gland cylinder passes through the orifice, it is arranged to form a gap allowing fluid flow between the outer peripheral surface of the main gland cylinder and the inner wall surface of the equipment housing forming the orifice. The inner peripheral surface of the main gland cylinder surrounds the outer peripheral surface of the sleeve to form a cylindrical space, and the cylindrical space is filled with the formed seal ring assembly and the semi-solid paste filler, and the semi-solid paste filler is flowable in the cylindrical space. The main gland step has a through hole extending from the outer peripheral surface of the main gland step to the inner peripheral surface thereof and communicating with the cylindrical space, and a nipple is provided at a part of the through hole close to the outer peripheral surface of the main gland step. The formed seal ring assembly includes a first formed seal ring and a second formed seal ring, and the semi-solid paste filler is located between the first formed seal ring and the second formed seal ring. The number of each of the first formed seal ring and the second formed seal ring is at least one and / or is formed as a separable component. The annular auxiliary gland is fastened to the rear end surface of the main gland step by a biasing mechanism, so that the tip of the annular auxiliary gland protrudes axially forward from the rear end surface of the main gland step into the cylindrical space and presses against the second formed seal ring. The support skeleton includes one or more axially supporting rods located between the first formed seal ring and the second formed seal ring, and each axially supporting rod is suspended in the cylindrical space. The lock ring surrounds the rear end of the sleeve and fastens the sleeve to the rotating shaft. The one or more positioning blocks connect the lock ring to the annular auxiliary gland,By being arranged so as to integrate the integrated semi-solid paste filler sealing devices for fluid equipment together, the integrated semi-solid paste filler sealing device for fluid equipment can be fitted onto the rotating shaft in one step or removed from the rotating shaft in one step, and the one or more positioning blocks are arranged such that the locking ring and the annular sub-ground can be removed, so that the locking ring and the sleeve can rotate together with the rotating shaft during the operation of the fluid equipment. The one or more axial support rods are configured such that the pitch between the first formed seal ring and the second formed seal ring can vary between a minimum pitch and a maximum pitch. The nipple is suitable for being connected to or blocked from the connection port of the external injector. When the nipple is connected to the connection port of the external injector, a semi-solid paste filler can be injected into the cylindrical space through the external injector. The semi-solid paste filler contributes to an increase in the sealing pressure formed in the cylindrical space. When the nipple is blocked, the sealing pressure can be adjusted through the biasing mechanism. Provided is an integrated semi-solid paste filler sealing device for fluid equipment, characterized in that...

[0009] Preferably, the axial length from the front end surface of the first formed seal ring in the cylindrical space to the front end surface of the main ground step is more than twice the axial length from the rear end surface of the second formed seal ring to the front end surface of the main ground step.

[0010] Preferably, the integrated semi-solid paste filler sealing device for fluid equipment further includes an additional cylinder integrally formed at the tip of the main ground cylinder. The inner peripheral surface of the additional cylinder forms a spiral groove, or the front end surface of the additional cylinder forms a plurality of concave grooves extending from the outer peripheral surface of the additional cylinder to the inner peripheral surface of the additional cylinder and arranged at intervals. And / or the integrated semi-solid paste filler sealing device for fluid equipment further includes an additional sleeve integrally formed at the tip of the sleeve. The outer peripheral surface of the additional sleeve forms a plurality of toothed rings arranged at axial intervals, or the front end surface of the additional sleeve forms a plurality of grooves extending from the outer peripheral surface of the additional cylinder to the inner peripheral surface of the additional sleeve and arranged at radial intervals.

[0011] Preferably, the starting point of the spiral groove is close to or located at the front end face of the additional cylinder, and the ending point of the spiral groove is close to or located at the rear end face of the additional cylinder, and is spaced apart from the cylindrical space, and the radial groove depth, axial groove width and / or groove cross-sectional area of the spiral groove is constant or gradually increasing from the starting point to the ending point of the spiral groove.

[0012] Preferably, the plurality of toothed rings are spaced apart from the cylindrical space, and each toothed ring is any one or a combination of them of straight-toothed, saw-toothed or helical-toothed.

[0013] Preferably, the semi-solid paste filler is arranged as a mixture of fibers and a lubricant, and the lubricant is arranged as a mixture of solid powder and oil.

[0014] Preferably, the support skeleton further includes a first annular bracket abutting against the rear end face of the first formed seal ring and a second annular bracket abutting against the front end face of the second formed seal ring. Each axial support rod includes a first tip, a first position stopper portion protruding with respect to the first tip, a second tip, and a second position stopper portion protruding with respect to the second tip. The first tip is slidably inserted into the first annular bracket, and the second tip is slidably inserted into the second annular bracket. In this way, at the minimum pitch, the first position stopper portion abuts against the first annular bracket, and the second position stopper portion abuts against the second annular bracket.

[0015] Preferably, the biasing mechanism includes a bolt and a spring fitted on the bolt. The bolt penetrates through a through hole extending in the axial direction of the annular sub-ground and is screwed into a threaded hole formed on the rear end face of the main ground step. The annular sub-ground is tightened against the cylindrical main ground by the biasing force generated by the compression of the spring. At the same time, a certain gap is left between the front end face of the rear end that does not protrude into the cylindrical space of the annular sub-ground and the rear end face of the main ground step, so that the annular sub-ground can be axially displaced with respect to the cylindrical main ground, and at the maximum pitch, the spring is completely compressed.

Advantages of the Invention

[0016] The integrated semi-solid mud-like filler sealing device for fluid equipment provided by the present invention can improve the reliability and safety of the device, can be easily installed and used, prevent sealing defects caused by artificial installation of the device, and is convenient for removing and reassembling the device during maintenance and inspection of fluid equipment. In fluids with poor operating conditions and many impurity particles, it can also solve the problems of short service life of the sealing device and frequent sealing defects, and effectively improve the wide application and economic effect of the device.

[0017] The above and other aspects of the present invention will be more fully understood from the following detailed description with reference to the accompanying drawings.

Brief Description of the Drawings

[0018]

Figure 1

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Figure 6

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Figure 8

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Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0019] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the relative arrangements, numerical expressions, and numerical values of the members and steps described in these embodiments do not limit the scope of the present invention unless otherwise specified.

[0020] Technologies and equipment known to those skilled in the art may not be described in detail, but where appropriate, the said technologies and equipment should be regarded as part of the specification.

[0021] In all examples shown and considered here, any specific value should be construed as illustrative rather than limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] Note that in the following drawings, the same reference numerals and alphabets indicate similar items. It should be noted that once an item is defined in one drawing, it is not necessary to further explain it in subsequent drawings.

[0023] As shown in FIGS. 1 and 2, the present invention relates to an integrated semi-solid paste filler sealing device for fluid equipment (hereinafter simply referred to as device 10) for sealing a rotating shaft 12 passing through an orifice 27 of an equipment housing (hereinafter simply referred to as housing 26) so that the fluid 11 in the housing 26 does not leak from the orifice 27. Note that FIG. 1 is a cross-sectional view of the device 10 before being assembled between the rotating shaft 12 and the housing 26, and FIG. 2 is a cross-sectional view of the device 10 after being assembled between the rotating shaft 12 and the housing 26. The housing 26 may be the above-described pump housing, or may be the housing 26 of any other fluid equipment having the rotating shaft 12.

[0024] In this specification, for convenience of explanation, the details of the structure of the device 10 are described based on the device 10 being assembled between the rotating shaft 12 and the housing 26. Here, the terms "front" and "rear" are defined along the axis L of the device 10, "front" means the side where the axial direction of the device 10 or the housing 26 is close to the fluid 11 in the housing 26, "rear" means the other side where the axial direction of the device 10 or the housing 26 is far from the fluid 11 in the housing 26, and the terms "inner" and "outer" are defined perpendicular to the axis L of the device 10, "inner" means the side where the radial direction of the device 10 or the housing 26 is close to the axis L of the device 10, and "outer" means the other side where the radial direction of the device 10 is far from the axis L of the device 10.

[0025] Generally, the device 10 includes a sleeve 14, a lock ring 16, a formed seal ring assembly 17, a semi-solid paste filler 18, a cylindrical main gland 20, an annular sub-gland 22, a support skeleton 42, and one or more removable positioning blocks 34 attached around the rotating shaft 12. In FIGS. 1-2, FIGS. 4, FIGS. 8-9 and FIG. 11, the support skeleton 42 is removed to clearly show the semi-solid paste filler 18, and in FIG. 6, the semi-solid paste filler 18 is removed to clearly show the support skeleton 42.

[0026] The sleeve 14 is made of a hard material including any one of metal, ceramic, alloy, silicon carbide or a combination thereof.

[0027] As shown in FIG. 1, the lock ring 16 surrounds the rear end of the sleeve 14 and fastens the sleeve 14 to the rotating shaft 12. For example, one or more fastening screws are screwed into one or more screw holes 16a extending in the radial direction of the lock ring 16 and penetrate the rear end of the sleeve 14, thereby fastening the sleeve 14 to the rotating shaft 12. Thus, when the rotating shaft 12 rotates, the sleeve 14 rotates together with the rotating shaft 12. Here, the diameter of the outer peripheral surface of the sleeve 14 is kept substantially constant.

[0028] On the inner peripheral surface of the tip of the sleeve 14, a seal ring groove 15 is formed for accommodating an elastic, for example, an O-ring 19 (shown in FIG. 2) to seal between the sleeve 14 and the rotating shaft 12.

[0029] As shown in FIG. 2, the tip of the cylindrical main ground 20 forms a main ground cylinder 20a, and the rear end of the cylindrical main ground 20 forms a main ground step 20b extending outward with respect to the main ground cylinder 20a.

[0030] The main ground step 20b is fastened to the rear end face 26a around the orifice 27 of the housing 26 by one or more bolts 35 through, for example, a packing 24 (for example, a pad or an elastic material such as fiber or rubber), so as to form a seal between the rear end face 26a of the housing 26 and the main ground step 20b, that is, between the cylindrical main ground 20. At the same time, the main ground cylinder 20a extends axially through the orifice 27 (shown in FIG. 1), and preferably extends axially beyond the front wall surface 26b around the orifice 27 of the housing 26, so as to form a gap 29 allowing the flow of the fluid 11 between the outer peripheral surface of the main ground cylinder 20a and the inner wall surface 26c of the housing 26 forming the orifice 27.

[0031] The outer contour of the main ground step 20b may have any shape of circular (shown in FIG. 3), waist-shaped, barrel-shaped, square, or fin-shaped so as to match the shape of the housing 26.

[0032] Continuing to refer to FIGS. 1 and 2, the rear end of the main ground cylinder 20a is connected to the main ground step 20b, for example, integrally formed. Preferably, the outer peripheral surface of the rear end of the main ground cylinder 20a forms a convex ring 20a1 that extends axially to the orifice 27 and terminates the gap 29. Compared with the axial length of the main ground cylinder 20a, the axial length of the convex ring 20a1 is significantly smaller and can be ignored.

[0033] The inner peripheral surface of the main ground cylinder 20a surrounds the outer peripheral surface of the sleeve 14 to form a cylindrical space, and the cylindrical space is filled with a molded seal ring assembly 17 and a semi-solid mud-like filler 18. Specifically, the tip of the main ground cylinder 20a forms an abutting step 20a2 that extends inwardly with respect to the inner peripheral surface of the main ground cylinder 20a. A minute gap is formed between the inner peripheral surface of the abutting step 20a2 and the outer peripheral surface of the sleeve 14 for the main ground cylinder 20a, that is, the cylindrical main ground 20 to be loosely fitted on the outer peripheral surface of the sleeve 14. For example, the tip surface of the abutting step 20a2 may be radially aligned with the tip surface of the sleeve 14 in order to realize a compact structure.

[0034] The molded seal ring assembly 17 includes a first molded seal ring 17a and a second molded seal ring 17b, and the semi-solid mud-like filler 18 is located between the first molded seal ring 17a and the second molded seal ring 17b.

[0035] Here, the number of each of the first molded seal ring 17a and the second molded seal ring 17b is at least one.

[0036] Specifically, when the molded seal ring assembly 17 includes a plurality of first molded seal rings 17a, the plurality of first molded seal rings 17a are arranged adjacent to each other axially, and similarly, when the molded seal ring assembly 17 includes a plurality of second molded seal rings 17b, the plurality of second molded seal rings 17b are arranged adjacent to each other axially.

[0037] Here, each of the first formed seal ring 17a and the second formed seal ring 17b may be formed as a separable member.

[0038] Specifically, at least one of the first formed seal ring 17a and the second formed seal ring 17b may be divided into a first formed seal ring member and a second formed seal ring member along its axial cross-section so as to join the first formed seal ring member and the second formed seal ring member around the rotation axis 12.

[0039] As shown in FIG. 2, the axial length X from the front end surface of the first formed seal ring 17a in the cylindrical space to the front end surface of the main ground step 20b is at least twice the axial length Y from the rear end surface of the second formed seal ring 17b to the front end surface of the main ground step 20b.

[0040] The rear end of the annular sub-ground 22 is fastened to the rear end surface of the main ground step 20b by the biasing mechanism 28, so that the front end of the annular sub-ground 22 protrudes axially into the cylindrical space and presses against the second formed seal ring 17b. That is, the front end surface of the first formed seal ring 17a abuts against the rear end surface of the abutting step 20a2, the rear end surface of the second formed seal ring 17b abuts against the front end of the annular sub-ground 22, the outer peripheral surface of the formed seal ring assembly 17 abuts against the inner peripheral surface of the main ground cylinder 20a, and the inner peripheral surface of the formed seal ring assembly 17 abuts against the outer peripheral surface of the sleeve 14.

[0041] As shown in FIG. 4, the inner peripheral surface of the annular secondary ground 22 is loosely fitted on the outer peripheral surface of the sleeve 14. However, the inner peripheral surface of the tip of the annular secondary ground 22 has a larger diameter than the inner peripheral surface of the rear end of the annular secondary ground 22, and the outer peripheral surface of the tip of the annular secondary ground 22 has a smaller diameter than the inner peripheral surface of the main ground step 20b. Thus, the tip of the annular secondary ground 22 can smoothly project into the cylindrical space as an axial projection. As a result, the total axial length of the formed seal ring assembly 17 and the semi-solid paste filler 18 is equal to or less than the axial length of the cylindrical space. That is, the second formed seal ring 17b does not axially exceed the rear end surface of the main ground step 20b.

[0042] The formed seal ring assembly 17 may be a rope-like object woven with fibers (also called packing) or made of rubber. The formed seal ring assembly 17 has elastoplasticity and may be pressed until elastoplastic deformation occurs.

[0043] The semi-solid paste filler 18 may be made from a mixture of fibers and a lubricant, and the lubricant is a mixture of solid powder and oil.

[0044] Preferably, the main ground step 20b includes a through hole 23 that extends from the outer peripheral surface of the main ground step 20b to the inner peripheral surface of the main ground step 20b and communicates with the cylindrical space. The axis of the through hole 23 and the axis L of the device 10 form an angle greater than, for example, 60°. A part of the through hole 23 close to the outer peripheral surface of the main ground step 20b has a nipple 23a that extends along the axis of the through hole 23. During normal operation of the device 10, the nipple 23a may be blocked by the nut 25. When it is necessary to add the semi-solid paste filler 18, the nut 25 is removed and the connection port of an external injector (for example, a filler gun) is connected to the nipple 23a, and the semi-solid paste filler 18 is injected into the cylindrical space through the external injector. Since the semi-solid paste filler 18 contributes to an increase in the seal pressure formed in the cylindrical space, the semi-solid paste filler 18 is clamped between the rear end surface of the first formed seal ring 17a and the front end surface of the second formed seal ring 17b.

[0045] Here, as shown in detail in FIG. 5, the biasing mechanism 28 may include a bolt 30 having a head 30a and a screw, and a spring 32 fitted onto the bolt 30. When the bolt 30 passes through a through-hole 21 extending in the axial direction of the annular sub-ground 22 and is screwed into an axially extending screw hole formed in the rear end surface of the main ground step 20b, one end of the spring 32 abuts against the head 30a, and the other end of the spring 32 abuts against the rear end surface of the annular sub-ground 22 or the bottom of the concave groove 22a of the annular sub-ground 22. The annular sub-ground 22 is clamped to the cylindrical main ground 20 by the biasing force generated by the compression of the spring 32. At the same time, a certain gap is left between the front end surface of the rear end that does not protrude into the cylindrical space of the annular sub-ground 22 and the rear end surface of the main ground step 20b so that the annular sub-ground 22 can be displaced axially with respect to the cylindrical main ground 20. That is, the diameter of the through-hole 21 of the annular sub-ground 22 is larger than the diameter of the screw and smaller than the diameter of the head 30a. The spring 32 may include either a disc spring that can provide a greater force and has a shorter stroke or a coil spring (shown in FIG. 5) that can provide a smaller force and has a longer stroke.

[0046] On the other hand, when the nipple 23a is closed by the nut 25, the biasing mechanism 28 can adjust the sealing pressure. For example, tightening the bolt 30 can increase the biasing force received by the molded seal ring assembly 17 and the semi-solid mud-like filler 18, and loosening the bolt 30 can decrease the biasing force received by the molded seal ring assembly 17 and the semi-solid mud-like filler 18. Further, by removing the annular sub-ground 22, the molded seal ring assembly 17 and the semi-solid mud-like filler 18 can be taken out axially, the molded seal ring assembly 17 can be replaced, and then the semi-solid mud-like filler 18 can be injected into the cylindrical space from the through-hole 23 by an external injector.

[0047] On the other hand, the biasing mechanism 28 can mitigate the impact of shock and vibration on the annular sub-ground 22.

[0048] In particular, when the semi-solid mud-like filler 18 is injected into the cylindrical space, the pressure inside the cylindrical space surges, and by resisting the biasing force acting on the annular secondary ground 22, the annular secondary ground 22 is displaced axially away from the cylindrical primary ground 20. When the pressure inside the cylindrical space decreases, the annular secondary ground 22 can be displaced axially closer to the cylindrical primary ground 20. For example, during the normal operation of the device 10, the forming seal ring assembly 17 may wear and the total axial length of the forming seal ring assembly 17 and the semi-solid mud-like filler 18 may decrease. In this case, until the gap is eliminated, the annular secondary ground 22 may be further displaced axially closer to the cylindrical primary ground 20, that is, the total axial length of the decreased forming seal ring assembly 17 and the semi-solid mud-like filler 18 may be compensated by the end face of the annular secondary ground 22 being in contact with the rear end face of the cylindrical primary ground 20.

[0049] As shown in FIG. 6, or returning to FIGS. 2 and 3, the lock ring 16 is rotatably positioned with respect to the one or more positioning blocks 34, and the device 10 can be integrated together by the one or more positioning blocks 34, that is, the sleeve 14, the lock ring 16, the forming seal ring assembly 17, the semi-solid mud-like filler 18, the cylindrical primary ground 20 and the annular secondary ground 22 can be integrated together, and the device 10 can be fitted onto the rotating shaft 12 in one step, or the device 10 can be removed from the rotating shaft 12 in one step.

[0050] For example, the lock ring 16 may be axially positioned relative to the sleeve 14 by the one or more positioning blocks 34. Specifically, the positioning block 34 includes a first portion 34a and a second portion 34b that form an angle (e.g., a right angle). One or more bolts 36 passing axially through the first portion 34a of the positioning block 34 fasten the positioning block 34 to the rear end face of the annular sub-ground 22. The axial length of the first portion 34a of the positioning block 34 is smaller than the axial length of the annular sub-ground 22. Also, the axial length of the first portion 34a of the positioning block 34 is equal to the pitch between the rear end face of the annular sub-ground 22 and the front end face of the lock ring 16. In this way, the annular sub-ground 22 is adjacent to the lock ring 16, realizing a compact structure.

[0051] The second portion 34b of the positioning block 34 may include an annular groove 34b1 for receiving the outer peripheral edge of the lock ring 16, or an annular guide groove may be formed on the outer peripheral edge of the lock ring 16, and the second portion 34b of the positioning block 34 may include a radial protrusion inserted into the annular guide groove of the lock ring 16. This restricts the axial movement of the lock ring 16 relative to the sleeve 14 while allowing the lock ring 16 to rotate relative to the sleeve 14. After the device 10 having the positioning block 34 is fitted onto the rotating shaft 12 in one step, the positioning block 34 is removed from the sleeve 14 before the movement of the rotating shaft 12 during the operation of the fluid equipment. When it is necessary to remove the device 10 from the rotating shaft 12, the positioning block 34 is reinstalled on the lock ring 16, and further the one or more fastening screws are loosened to remove the device 10 from the rotating shaft 12 in one step.

[0052] As shown in FIG. 6, the support skeleton 42 includes one or a plurality of axially supporting rods 42c located between the first formed seal ring 17a and the second formed seal ring 17b. By suspending each axially supporting rod 42c in the cylindrical space, the semi-solid muddy filler 18 is assisted in resisting excessive external pressure, for example, the biasing force. Referring in detail to FIG. 7, the support skeleton 42 further includes a first annular bracket 42a abutting against the rear end surface of the first formed seal ring 17a and a second annular bracket 42b abutting against the front end surface of the second formed seal ring 17b. The plurality of axially supporting rods 42c are uniformly distributed along the circumferential direction of the first annular bracket 42a and the second annular bracket 42b and may have elasticity. Both axial ends of each axially supporting rod 42c are respectively connected to the first annular bracket 42a and the second annular bracket 42b. For example, each axially supporting rod 42c includes a first tip portion 42c1, a first stopper portion 42c2 protruding with respect to the first tip portion 42c1, a second tip portion 42c3, and a second stopper portion 42c4 protruding with respect to the second tip portion 42c3. The first tip portion 42c1 is slidably inserted into the corresponding orifice of the first annular bracket 42a, and the second tip portion 42c3 is slidably inserted into the corresponding orifice of the second annular bracket 42b. Thereby, the axially supporting rod 42c can change the pitch between the first formed seal ring 17a and the second formed seal ring 17b between the minimum pitch and the maximum pitch. When the pitch changes from the maximum pitch to the minimum pitch, the annular sub-ground 22 is displaced forward in the axial direction until the first stopper portion 42c2 abuts against the first annular bracket 42a and the second stopper portion 42c4 abuts against the second annular bracket 42b. When the pitch changes from the minimum pitch to the maximum pitch, the annular sub-ground 22 is displaced backward in the axial direction until the spring 32 is completely compressed.

[0053] In this way, the support skeleton 42 can maintain the minimum pitch while resisting excessive external pressure. At the same time, by allowing the pitch to change from the minimum pitch to the maximum pitch, when performing online maintenance or pressurizing and replenishing the semi-solid paste filler 18, overheating, expansion of the semi-solid paste filler 18 due to the internal pressure accumulation in the cylindrical space, and thus seal burnout can be prevented.

[0054] Also, the inner diameter of the first annular bracket 42a is larger than the inner diameter of the first formed seal ring 17a (i.e., the diameter of the inner circumferential surface of the first formed seal ring 17a), and the outer diameter of the first annular bracket 42a is smaller than the outer diameter of the first formed seal ring 17a (i.e., the diameter of the outer circumferential surface of the first formed seal ring 17a).

[0055] As shown in FIG. 8, when the positioning block 34 is removed from the sleeve 14 and the sleeve 14 is rotated together with the rotation shaft 12, the semi-solid paste filler 18 is divided into a stationary portion 18a and a rotating portion 18b that is slidably joined, bonded, and contacted to the stationary portion 18a. The rotating portion 18b (for example, often composed of fibers in the semi-solid paste filler 18) is wound around the outer peripheral surface of the sleeve 14 or closer to the outer peripheral surface of the sleeve 14 so as to rotate together with the sleeve 14, and the stationary portion 18a is bonded or close to the inner peripheral surface of the main grand cylinder 20a, the rear end surface of the first formed seal ring 17a, and the front end surface of the second formed seal ring 17b, and substantially maintains a stationary state. Preferably, each axial support rod 42c is closer to the inner peripheral surface of the main grand cylinder 20a than the outer peripheral surface of the sleeve 14. Thus, in order to avoid the rotating portion 18b of the semi-solid paste filler 18, the support skeleton 42 substantially maintains a stationary state.

[0056] Therefore, when the rotating shaft 12 rotates, a large amount of heat is generated due to the relative sliding between the stationary part 18a and the rotating part 18b. However, the axial length X from the tip surface of the first formed seal ring 17a to the tip surface of the main ground step 20b in the cylindrical space is more than twice the axial length Y from the rear end surface of the second formed seal ring 17b to the tip surface of the main ground step 20b. As a result, the fluid 11, especially the liquid, can circulate and enter the gap 29 and flow around the main part of the semi-solid mud-like filler 18, so that the semi-solid mud-like filler 18 can be significantly cooled.

[0057] Continuing to refer to FIG. 8, preferably, the apparatus 10 further includes an additional cylinder 20c formed integrally with the tip of the main ground cylinder 20a for discharging debris. A spiral groove 38 is formed on the inner peripheral surface of the additional cylinder 20c, and the rotation direction of the spiral groove 38 is the same as the rotation direction of the rotating shaft 12 (for example, clockwise). The spiral groove 38 extends along a spiral line having a predetermined lead angle. The starting point of the spiral line is close to or located at the tip surface of the additional cylinder 20c, and the ending point of the spiral line is close to or located at the rear end surface of the additional cylinder 20c. The rear end surface of the additional cylinder 20c may be understood as abutting against the tip surface of the main ground cylinder 20a, that is, the tip surface of the step 20a2. The spiral groove 38 is spaced from the cylindrical space.

[0058] Here, the radial groove depth (also referred to as the groove diameter), the axial groove width, and / or the groove cross-sectional area of the spiral groove 38 are constant or gradually increasing from the starting point to the ending point of the spiral line.

[0059] Generally speaking, the radial groove depth of the spiral groove 38 refers to the radial depth from the groove crest 38a with a smaller diameter of the spiral groove 38 to the groove bottom 38b with a larger diameter. The axial groove width of the spiral groove 38 is the axial width of the spiral groove 38 measured on a reference line parallel to the axis of the spiral groove 38. The groove cross-sectional area of the spiral groove 38 is calculated based at least on the radial groove depth in the axial cross-section of the spiral groove 38.

[0060] For example, as shown in FIG. 8, when the radial groove depth of the spiral groove 38 gradually increases, the diameter of the groove bottom 38b of the spiral groove 38 gradually increases from the starting point to the ending point of the spiral line, and the diameter of the groove top 38a of the spiral groove 38 may be kept substantially constant. In this case, the diameter of the groove top 38a of the spiral groove 38 may be smaller than the outer diameter of the sleeve 14 (i.e., the diameter of the outer peripheral surface of the sleeve 14) and larger than the inner diameter of the sleeve 14 (i.e., the diameter of the inner peripheral surface of the sleeve 14).

[0061] For example, as shown in FIG. 9, when the radial groove depth of the spiral groove 38 gradually increases, the diameter of the groove top 38a of the spiral groove 38 gradually increases from the starting point to the ending point of the spiral line, and the diameter of the groove bottom 38b of the spiral groove 38 may be kept substantially constant. In this case, the minimum diameter of the groove top 38a of the spiral groove 38 is larger than the outer diameter of the sleeve 14.

[0062] During the rotation of the rotating shaft 12, the spiral groove 38 remains stationary, and the spiral groove 38 cooperates with the rotating shaft 12 to prevent the fluid 11, particularly the particulate impurities in the liquid, from entering the cylindrical space and breaking the seal between the sleeve 14 and the cylindrical main ground 20.

[0063] Preferably, referring to FIG. 10, the front end surface of the additional cylinder 20c forms a plurality of equally spaced concave grooves 20c1 or convex teeth 20c2 that are arranged at intervals and can be selected. Each concave groove 20c1 or convex tooth 20c2 penetrates and / or extends from the outer peripheral surface of the additional cylinder 20c to the inner peripheral surface of the additional cylinder 20c, and each concave groove 20c1 or convex tooth 20c2 is spaced apart from the cylindrical space. Each concave groove 20c1 or convex tooth 20c2 may be straight on the axis of the additional cylinder 20c (which coincides with the axis L of the device 10) (as shown in FIG. 10), may be inclined at a certain angle with respect to the axis of the additional cylinder 20c, and / or may be spiral around the axis of the additional cylinder 20c.

[0064] Preferably, as shown in FIG. 11, the apparatus 10 includes an additional sleeve 14a formed integrally with the tip of the sleeve 14 for discharging debris. The outer peripheral surface of the additional sleeve 14a forms a plurality of pump effect tooth rings 40 arranged at axial intervals, and the plurality of tooth rings are spaced apart from the cylindrical space. For example, each pump effect tooth ring 40 is any one or a combination of straight teeth, saw teeth, or helical teeth.

[0065] Preferably, referring to FIG. 12, the tip surface of the additional sleeve 14a forms a plurality of concave grooves 14a1 or convex teeth 14a2 arranged at intervals and selectable at equal intervals. Each concave groove 14a1 or convex tooth 14a2 penetrates and / or extends from the outer peripheral surface of the additional sleeve 14a to the inner peripheral surface of the additional sleeve 14a, and each concave groove 14a1 or convex tooth 14a2 is spaced apart from the cylindrical space. Each concave groove 14a1 or convex tooth 14a2 may be straight on the axis of the additional sleeve 14a (which coincides with the axis L of the apparatus 10) (as shown in FIG. 12), may be inclined at a certain angle with respect to the axis of the additional sleeve 14a, and / or may be spiral around the axis of the additional sleeve 14a.

[0066] In the rotation of the rotating shaft 12, the sleeve 14 and the pump effect tooth ring 40 rotate together with the rotating shaft 12 to prevent particulate impurities in the fluid 11 from entering the cylindrical space and breaking the seal between the sleeve 14 and the cylindrical main ground 20.

[0067] Returning to FIG. 9, when the proportion of particulate impurities in the fluid 11 is large, the additional cylinder 20c and the additional sleeve 14a can be provided simultaneously. The spiral groove 38 of the additional cylinder 20c is radially spaced and opposed to the pump effect tooth ring 40 of the additional sleeve 14a. In FIG. 9, the axial length of the additional cylinder 20c is equal to the axial length of the additional sleeve 14a, but this is not essential. It will be understood that the various features described above regarding the additional cylinder 20c and the additional sleeve 14a can be flexibly combined or implemented individually.

[0068] Although some specific embodiments of the present invention have been described in detail by way of example, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the devices in the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is indicated by the scope of claims for utility model registration.

Claims

1. An integrated semi-solid mud filler seal device (10) for fluid equipment for sealing a pivot shaft (12) passing through an orifice (27) in an equipment housing (26) to prevent a fluid (11) in the equipment housing (26) from leaking through the orifice (27), the device comprising: a sleeve (14) mounted around the pivot shaft (12), a lock ring (16), a molded seal ring assembly (17), a semi-solid mud filler (18), a cylindrical primary gland (20), an annular secondary gland (22), a supporting skeleton (42), and one or more removable positioning blocks (34); The front end of the cylindrical main gland (20) forms a main gland cylinder (20a), and the rear end of the cylindrical main gland (20) forms a main gland step (20b) extending outward relative to the main gland cylinder (20a), The main gland step (20b) is fastened to a rear end surface (26a) around an orifice (27) of the equipment housing (26), and is disposed so that a gap (29) that allows a flow of the fluid (11) is formed between the outer peripheral surface of the main gland cylinder (20a) and an inner wall surface (26c) of the equipment housing (26) that forms the orifice (27) by the main gland cylinder (20a) passing through the orifice (27); The inner peripheral surface of the main gland cylinder (20a) surrounds the outer peripheral surface of the sleeve (14) to form a cylindrical space, and the cylindrical space is filled with a molded seal ring assembly (17) and a semi-solid mud filler (18), and the semi-solid mud filler (18) is allowed to flow in the cylindrical space. the main gland step (20b) has a through hole (23) extending from an outer circumferential surface of the main gland step (20b) to an inner circumferential surface of the main gland step (20b) and communicating with the cylindrical space, and has a nipple (23a) in a part of the through hole (23) close to the outer circumferential surface of the main gland step (20b); The molded seal ring assembly (17) includes a first molded seal ring (17a) and a second molded seal ring (17b), and a semi-solid mud filler (18) is located between the first molded seal ring (17a) and the second molded seal ring (17b); the number of each of the first molded sealing ring (17a) and the second molded sealing ring (17b) is at least one and / or each is formed as a separable part; The annular secondary gland (22) is fastened to the rear end surface of the main gland step (20b) by the biasing mechanism (28), so that the tip of the annular secondary gland (22) protrudes axially forward from the rear end surface (26a) of the main gland step (20b) into the cylindrical space and is pressed against the second molded seal ring (17b); The supporting skeleton (42) includes one or more axial supporting rods (42c) located between the first formed seal ring (17a) and the second formed seal ring (17b), each axial supporting rod (42c) suspended within the cylindrical space; The lock ring (16) surrounds the rear end of the sleeve (14) to fasten the sleeve (14) to the rotating shaft (12); the one or more positioning blocks (34) are arranged to connect the lock ring (16) to the annular secondary gland (22) and to integrate the integrated semi-solid mud filler seal device for fluid equipment (10) together, so that the integrated semi-solid mud filler seal device for fluid equipment (10) can be fitted to the pivot shaft (12) in a single step or removed from the pivot shaft (12) in a single step, and the one or more positioning blocks (34) are arranged to be removed from the lock ring (16) and the annular secondary gland (22) so that the lock ring (16) and the sleeve (14) can rotate together with the pivot shaft (12) during operation of the fluid equipment; the one or more axial support rods (42c) are configured such that the pitch of the first formed seal ring (17a) and the second formed seal ring (17b) can be varied between a minimum pitch and a maximum pitch; The nipple (23a) is suitable for being connected to or blocked from a connection port of an external syringe. When the nipple (23a) is connected to the connection port of the external syringe, a semi-solid mud filler (18) can be injected into the cylindrical space via the external syringe. The semi-solid mud filler (18) contributes to increasing the sealing pressure formed in the cylindrical space. When the nipple (23a) is blocked, the sealing pressure can be adjusted via a biasing mechanism (28). An integrated semi-solid mud filler seal device (10) for fluid equipment.

2. An axial length (X) from a front end surface of the first molded seal ring (17a) to a front end surface of the main gland step (20b) in the cylindrical space is at least twice as long as an axial length (Y) from a rear end surface of the second molded seal ring (17b) to a front end surface of the main gland step (20b). The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 1.

3. The integrated semi-solid mud filler seal device (10) for fluid equipment further comprises an additional cylinder (20c) formed integrally at the tip of the main gland cylinder (20a), and the inner peripheral surface of the additional cylinder (20c) forms a spiral groove (38), or the tip surface of the additional cylinder (20c) forms a plurality of radially spaced recessed grooves extending from the outer peripheral surface of the additional cylinder (20c) to the inner peripheral surface of the additional cylinder (20c), and / or The integrated semi-solid mud filler seal device (10) for fluid equipment further includes an additional sleeve (14a) integrally formed at the tip of the sleeve (14), and the outer peripheral surface of the additional sleeve (14a) forms a plurality of tooth rings arranged at intervals in the axial direction, or the tip surface of the additional sleeve (14a) forms a plurality of grooves extending from the outer peripheral surface of the additional sleeve (14a) to the inner peripheral surface of the additional sleeve (14a) and arranged at intervals in the radial direction. The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 1.

4. The start point of the spiral groove (38) is close to or located at the tip end surface of the additional cylinder (20c), the end point of the spiral groove (38) is close to or located at the rear end surface of the additional cylinder (20c) and is separated from the cylindrical space, and the radial groove depth, axial groove width and / or groove cross-sectional area of ​​the spiral groove (38) are constant or gradually increasing from the start point to the end point of the spiral groove (38). The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 3.

5. The plurality of tooth rings are spaced apart from the cylindrical space, and each tooth ring has one or a combination of straight teeth, helical teeth, or helical teeth. The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 3.

6. The semi-solid mud filler (18) is disposed as a mixture of fibers and a lubricant, which is disposed as a mixture of solid powder and oil. The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 1.

7. The support skeleton (42) further includes a first annular bracket (42a) in contact with a rear end surface of the first molded seal ring (17a) and a second annular bracket (42b) in contact with a front end surface of the second molded seal ring (17b). Each axial support rod (42c) includes a first tip (42c1), a first position stopper portion (42c2) protruding from the first tip (42c1), a second tip (42c3), and a second position stopper portion (42c4) protruding from the second tip (42c3). The first tip (42c1) is slidably inserted into the first annular bracket (42a) and the second tip (42c3) is slidably inserted into the second annular bracket (42b), so that at the minimum pitch, the first position stopper portion (42c2) abuts against the first annular bracket (42a) and the second position stopper portion (42c4) abuts against the second annular bracket (42b). The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 1.

8. The biasing mechanism (28) includes a bolt and a spring (32) fitted on the bolt. The bolt passes through a through hole (21) extending in the axial direction of the annular secondary gland (22) and is screwed into a screw hole formed in the rear end face of the main gland step (20b). The biasing force generated by the compression of the spring (32) fastens the annular secondary gland (22) to the cylindrical main gland (20). The annular secondary gland (22) can be displaced in the axial direction relative to the cylindrical main gland (20) by resisting the biasing force. Therefore, a certain gap is left between the tip face of the rear end of the annular secondary gland (22) that does not protrude into the cylindrical space and the rear end face of the main gland step (20b), and at the maximum pitch, the spring (32) is fully compressed. The integrated semi-solid mud filler seal device (10) for fluid equipment according to claim 7.

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