A packing type mechanical seal device

Abstract

The utility model provides a kind of prevent shaft sleeve loose's packing type mechanical sealing device, belong to mechanical sealing technical field, comprising: shaft sleeve, one end of shaft sleeve is provided with hug tightly part, and the outer circumferential surface of hug tightly part is set as outer taper surface;Locking ring, locking ring is provided with extrusion hole, and the hole wall surface of extrusion hole is set as inner taper surface, hug tightly part is arranged in extrusion hole, and the hole wall surface of extrusion hole and the outer circumferential surface of hug tightly part contact and form inclined wedge structure, locking ring is slidably connected with hug tightly part, and the axial stroke position of locking ring on hug tightly part determines the inner diameter size of hug tightly part;The beneficial effects of the utility model are that: locking ring can force the hug tightly part of shaft sleeve to contract radially by wedge structure, so that hug tightly part hug tightly rotating shaft, ensure the circumferential locking effect of shaft sleeve and rotating shaft, and hug tightly part can fully hug tightly the entire circumferential surface of rotating shaft, can adapt to various high pressure and high speed operating conditions, so that shaft sleeve and rotating shaft will not produce looseness.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology and relates to a cartridge mechanical seal device for preventing shaft sleeve loosening. Background Technology

[0002] Mechanical seals are widely used in equipment such as pumps, compressors, and mixing machinery. Their function is to isolate the leakage path between rotating parts (such as shafts) and stationary structural cavities, preventing harmful media within the cavity from leaking to the outside. Mechanical seals typically consist of a moving component fixed to the shaft and a stationary component fixed to the cavity.

[0003] Spring mechanical seals are a commonly used mechanical seal structure, generally including a rotating ring, a sealing ring, a pressure element (spring), and metal structural components. The rotating ring and the stationary ring are a pair of highly flat friction pairs. Under the positive pressure applied by the spring, the rotating ring and the stationary ring fit tightly together to form a sealing surface. The gap between the rotating and stationary rings when they rotate relative to each other is on the order of micrometers, which can effectively prevent internal fluid from leaking from the sealing surface.

[0004] In a cartridge mechanical seal, the rotating ring seat needs to be installed on the rotating shaft and locked circumferentially to the shaft. However, the surface of the rotating shaft is not suitable for directly installing the rotating ring seat. Therefore, a bushing needs to be installed on the rotating shaft and locked circumferentially to the rotating shaft. Then, the rotating ring seat is installed on the bushing. When the rotating shaft rotates, the rotating ring seat can be driven to rotate together through the bushing.

[0005] Therefore, the circumferential locking structure between the bushing and the shaft determines the transmission performance of the bushing. In the existing technology, the bushing is usually fixed to the shaft by a locking ring and a set screw. However, this design is relatively simple. Under high pressure conditions, the locking ring and the set screw are prone to loosening, causing the bushing to slip and become loose between the bushing and the shaft, which in turn leads to the failure of the bushing's transmission effect. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a cartridge-type mechanical seal device to prevent the bushing from loosening.

[0007] The objective of this utility model can be achieved through the following technical solution: a cartridge-type mechanical seal device for preventing shaft sleeve loosening, comprising:

[0008] A bushing, one end of which is provided with a clamping part, the outer peripheral surface of which is provided as an outer conical surface;

[0009] A locking ring is provided with a compression hole. The wall surface of the compression hole is set as an inner conical surface. The clamping part passes through the compression hole. The wall surface of the compression hole contacts the outer peripheral surface of the clamping part and forms a wedge structure. The locking ring is slidably connected to the clamping part. The axial travel position of the locking ring on the clamping part determines the inner diameter of the clamping part.

[0010] Preferably, it also includes a locking base and an adjusting bolt, wherein the locking base is axially locked to the bushing, one of the locking base and the locking ring is provided with a threaded hole, and the adjusting bolt passes through the other of the locking base and the locking ring and is connected to the threaded hole.

[0011] Preferably, the locking base is configured as a ring structure, the locking base is sleeved on the bushing, the locking base is provided with a set screw, the bushing wall is provided with a through hole, and the set screw passes through the through hole.

[0012] Preferably, the bushing is provided with a positioning shoulder and a retaining ring, one end face of the locking base abuts against the positioning shoulder, and the retaining ring abuts against the other end face of the locking base.

[0013] Preferably, the diameter of the clamping part increases uniformly along its axial direction from one end of the clamping part to the other end, and the shape of the extrusion hole is complementary to the outer surface contour shape of the clamping part.

[0014] Preferably, it also includes a sealing disc, which is sleeved on the bushing. The sealing disc is provided with a stationary ring, and a rotating ring seat is sleeved on the bushing. The rotating ring seat is provided with a rotating ring, and the rotating ring and the stationary ring are sealed together.

[0015] Preferably, a spring seat is also fitted on the bushing, the spring seat is axially locked to the bushing, the spring seat is provided with a spring, the spring is in contact with the moving ring seat, and the spring applies a spring force to the moving ring seat to make it tend towards the stationary ring.

[0016] Preferably, a retaining sleeve is fitted onto the moving ring.

[0017] Preferably, the areas on both sides of the sealing disc are the medium side and the atmosphere side, respectively, the moving ring and the stationary ring are located on the medium side, and the clamping part, the locking ring and the locking base are all located on the atmosphere side.

[0018] Preferably, the moving ring seat is circumferentially locked to the spring seat, and the stationary ring is circumferentially locked to the sealing disc.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The locking ring can force the clamping part of the bushing to contract radially through the wedge structure, thereby clamping the shaft tightly and ensuring the circumferential locking effect between the bushing and the shaft. The clamping part can fully clamp the entire circumferential surface of the shaft, which can adapt to various high pressure and high speed working conditions, so that there will be no loosening between the bushing and the shaft.

[0021] 2. By adjusting the bolt, the locking ring can be kept fixed relative to the locking base, thereby locking the locking ring in the corresponding axial position to maintain the circumferential locking force between the clamping part and the rotating shaft. Furthermore, by rotating the bolt, the locking ring can be pushed axially toward the locking base (the large end of the clamping part) to adjust the clamping force of the clamping part.

[0022] 3. It cleverly combines two different anti-loosening principles. The first anti-loosening mechanism: A huge static friction force is generated between the inner wall of the clamping part and the surface of the rotating shaft. This frictional torque is much greater than the torque that the bushing needs to transmit, thus preventing relative rotation between the bushing and the rotating shaft. The clamping force of the first anti-loosening mechanism is evenly distributed, does not damage the shaft surface, and the locking force is adjustable and substantial. The second anti-loosening mechanism: The tip of the set screw abuts against the surface of the rotating shaft, forming a mechanical interlock. Attached Figure Description

[0023] Figure 1 This is an exploded view of the locking ring and clamping part of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the containerized mechanical seal device of this utility model.

[0025] In the diagram, 100 is the bushing; 110 is the clamping part; 111 is the outer conical surface; 120 is the positioning shoulder; 130 is the snap ring; 140 is the moving ring seat; 150 is the moving ring; 160 is the ferrule; 170 is the spring seat; 171 is the spring; 200 is the locking ring; 210 is the compression hole; 211 is the inner conical surface; 300 is the locking base; 310 is the set screw; 400 is the adjusting bolt; 500 is the sealing disc; and 510 is the stationary ring. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 , Figure 2 As shown, a cartridge mechanical seal device for preventing shaft sleeve loosening includes:

[0028] A bushing 100 is provided at one end of a clamping part 110, and the outer peripheral surface of the clamping part 110 is configured as an outer conical surface 111.

[0029] The locking ring 200 is provided with a compression hole 210. The wall surface of the compression hole 210 is set as an inner conical surface 211. The clamping part 110 passes through the compression hole 210. The wall surface of the compression hole 210 contacts the outer peripheral surface of the clamping part 110 and forms a wedge structure. The locking ring 200 and the clamping part 110 are slidably connected. The axial travel position of the locking ring 200 on the clamping part 110 determines the inner diameter of the clamping part 110.

[0030] The bushing 100 is a tubular structure used to fit onto the rotating shaft. The clamping part 110 has a conical outer surface at one end of the bushing 100. The corresponding hole portion of the clamping part 110 is a clamping hole, which clamps the rotating shaft, thus achieving an interference fit between the clamping hole and the rotating shaft, and realizing circumferential locking between the bushing 100 and the rotating shaft. The locking ring 200 can be inserted into the clamping part 110 from one end of the bushing 100. Through the axial movement of the locking ring 200, the wedge effect between the conical surfaces causes radial deformation of the clamping part 110, thereby changing the inner diameter of the clamping hole in the clamping part 110, ultimately achieving an interference fit between the clamping hole and the rotating shaft.

[0031] During actual assembly, the locking ring 200 is inserted into the small end of the clamping part 110 and then moves towards the large end of the clamping part 110. The clamping part 110 is subjected to radial compressive force, which reduces the inner diameter of the clamping hole, resulting in an interference fit between the clamping hole and the rotating shaft, thereby allowing the clamping part 110 to clamp the rotating shaft. The amount of interference between the clamping hole and the rotating shaft is determined by the sliding stroke of the locking ring 200. The closer the locking ring 200 is to the large end of the clamping part 110, the greater the interference, and the greater the circumferential locking force between the clamping part 110 and the rotating shaft.

[0032] Based on the above embodiments, it also includes a locking base 300 and an adjusting bolt 400. The locking base 300 is axially locked to the bushing 100. One of the locking base 300 and the locking ring 200 is provided with a threaded hole. The adjusting bolt 400 passes through the other of the locking base 300 and the locking ring 200 and is connected to the threaded hole.

[0033] The locking base 300 is connected to the bushing 100, providing an axial reference position. The locking base 300 is close to the large end of the clamping part 110. The locking ring 200 can be fixed relative to the locking base 300 by adjusting the bolt 400, thereby locking the locking ring 200 in the corresponding axial position to maintain the circumferential locking force between the clamping part 110 and the rotating shaft. The adjusting bolt 400 can also be rotated to push the locking ring 200 axially toward the locking base 300 (the large end of the clamping part 110), thereby adjusting the clamping force of the clamping part 110.

[0034] like Figure 1 , Figure 2As shown, based on the above embodiment, the locking base 300 is configured as a ring structure, the locking base 300 is sleeved on the bushing 100, the locking base 300 is provided with a set screw 310, the wall of the bushing 100 is provided with a through hole, and the set screw 310 passes through the through hole.

[0035] While locking the bushing 100 and the shaft circumferentially with the locking ring 200, the structure of the locking screw is also retained. The set screw 310 locks with the shaft through the through hole on the bushing 100, thereby locking the bushing 100 and the shaft together, thus achieving a double anti-loosening effect of the bushing 100.

[0036] This invention cleverly combines two different anti-loosening principles. The first anti-loosening mechanism generates a large static friction force between the inner wall of the clamping part 110 and the surface of the rotating shaft. This frictional torque is much greater than the torque that the bushing 100 needs to transmit, thus preventing relative rotation between the bushing 100 and the rotating shaft. The clamping force of this first anti-loosening mechanism is evenly distributed, does not damage the shaft surface, and the locking force is adjustable and substantial. The second anti-loosening mechanism involves the tip of the set screw 310 abutting against the surface of the rotating shaft, forming a mechanical interlock. This embodiment combines the advantages of both anti-loosening methods while avoiding their respective disadvantages, ensuring the reliability of the bushing 100 in preventing loosening.

[0037] like Figure 1 , Figure 2 As shown, based on the above embodiment, the bushing 100 is provided with a positioning shoulder 120 and a retaining ring 130, one end face of the locking base 300 abuts against the positioning shoulder 120, and the retaining ring 130 abuts against the other end face of the locking base 300.

[0038] The locating shoulder 120 is a radial protrusion on the bushing 100, serving as an axial locating surface. The retaining ring 130 can be installed into a groove on the bushing 100. Together, the locating shoulder 120 and the retaining ring 130 axially fix the locking base 300 to the bushing 100, preventing axial movement of the locking base 300, simplifying installation, and improving reliability.

[0039] like Figure 1 As shown, based on the above embodiment, the diameter of the clamping part 110 increases uniformly along its axial direction from one end of the clamping part 110 to the other end, and the shape of the extrusion hole 210 is complementary to the outer surface contour shape of the clamping part 110.

[0040] The outer conical surface 111 of the clamping part 110 is a uniform conical surface with a linearly varying diameter; the inner conical surface 211 of the extrusion hole 210 matches the clamping part 110. This design ensures uniform conical surface fit, stable wedge effect, and consistent clamping force distribution.

[0041] like Figure 2As shown, based on the above embodiment, it also includes a sealing disc 500, which is sleeved on the bushing 100. The sealing disc 500 is provided with a stationary ring 510. The bushing 100 is sleeved with a rotating ring seat 140, which is provided with a rotating ring 150. The rotating ring 150 and the stationary ring 510 are sealed and fitted together.

[0042] Based on the above embodiments, a spring seat 170 is also sleeved on the bushing 100. The spring seat 170 is axially locked to the bushing 100. The spring seat 170 is provided with a spring 171. The spring 171 is in contact with the moving ring seat 140, and the spring 171 applies a spring force to the moving ring seat 140 to make it tend towards the stationary ring 510.

[0043] The end face contact between the rotating ring 150 and the stationary ring 510 achieves sealing during rotation. The spring 171 applies axial force to the rotating ring seat 140, so that the rotating ring 150 is always pressed against the stationary ring 510, compensating for wear and axial fluctuation, and keeping the sealing surfaces in contact.

[0044] Based on the above implementation method, a retaining sleeve 160 is fitted onto the moving ring 150.

[0045] Based on the above implementation, the areas on both sides of the sealing disc 500 are the medium side and the atmosphere side, respectively. The moving ring 150 and the stationary ring 510 are located on the medium side, while the clamping part 110, the locking ring 200 and the locking base 300 are all located on the atmosphere side.

[0046] Based on the above implementation method, the moving ring seat 140 and the spring seat 170 are circumferentially locked, and the stationary ring 510 and the sealing disc 500 are circumferentially locked.

[0047] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0048] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A cartridge-type mechanical seal device for preventing shaft sleeve loosening, characterized in that, include: A bushing (100) is provided at one end of which a clamping part (110) is provided, and the outer peripheral surface of the clamping part (110) is provided as an outer conical surface (111); A locking ring (200) is provided with a compression hole (210). The wall surface of the compression hole (210) is set as an inner conical surface (211). The clamping part (110) passes through the compression hole (210). The wall surface of the compression hole (210) contacts the outer peripheral surface of the clamping part (110) and forms a wedge structure. The locking ring (200) is slidably connected to the clamping part (110). The axial travel position of the locking ring (200) on the clamping part (110) determines the inner diameter of the clamping part (110).

2. The cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 1, characterized in that: It also includes a locking base (300) and an adjusting bolt (400), the locking base (300) being axially locked to the bushing (100), one of the locking base (300) and the locking ring (200) being provided with a threaded hole, and the adjusting bolt (400) passing through the other of the locking base (300) and the locking ring (200) and being connected to the threaded hole.

3. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 2, characterized in that: The locking base (300) is configured as a ring structure. The locking base (300) is sleeved on the bushing (100). The locking base (300) is provided with a set screw (310). The bushing (100) has a through hole in its wall, and the set screw (310) passes through the through hole.

4. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 3, characterized in that: The bushing (100) is provided with a positioning shoulder (120) and a retaining ring (130). One end face of the locking base (300) abuts against the positioning shoulder (120), and the retaining ring (130) abuts against the other end face of the locking base (300).

5. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 1, characterized in that: The diameter of the clamping part (110) increases uniformly along its axial direction from one end of the clamping part (110) to the other end, and the shape of the extrusion hole (210) is complementary to the outer surface contour shape of the clamping part (110).

6. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 2, characterized in that: It also includes a sealing disc (500), which is sleeved on the bushing (100). The sealing disc (500) is provided with a stationary ring (510). A rotating ring seat (140) is sleeved on the bushing (100). The rotating ring seat (140) is provided with a rotating ring (150). The rotating ring (150) and the stationary ring (510) are sealed and fitted together.

7. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 6, characterized in that: A spring seat (170) is also fitted on the bushing (100). The spring seat (170) is axially locked to the bushing (100). The spring seat (170) is provided with a spring (171). The spring (171) is in contact with the moving ring seat (140), and the spring (171) applies a spring force to the moving ring seat (140) to make it tend toward the stationary ring (510).

8. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 6, characterized in that: A retainer (160) is fitted onto the moving ring (150).

9. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 7, characterized in that: The areas on both sides of the sealing disc (500) are the medium side and the atmosphere side, respectively. The moving ring (150) and the stationary ring (510) are located on the medium side, while the clamping part (110), the locking ring (200), and the locking base (300) are all located on the atmosphere side.

10. A cartridge-type mechanical seal device for preventing shaft sleeve loosening as described in claim 7, characterized in that: The moving ring seat (140) is circumferentially locked to the spring seat (170), and the stationary ring (510) is circumferentially locked to the sealing disc (500).

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