Shock absorbing anti-release mechanical seal
By using a split-structure insert base and floating O-ring connection design, the failure problem of mechanical seals under vibration is solved, a stable connection and sealing effect between the dynamic ring and the insert base is achieved, and the durability of the mechanical seal is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO ANMU SEALING TECH
- Filing Date
- 2025-08-20
- Publication Date
- 2026-08-04
AI Technical Summary
Existing mechanical seals are prone to separation of the friction pair from the metal seat when the equipment vibrates, which in turn leads to mechanical seal failure.
The mounting base adopts a split structure, with the moving ring and the mounting base floatingly connected by an O-ring. This absorbs vibration energy and ensures the fixation of the moving ring and the mounting base. At the same time, the O-ring and friction force drive the moving ring and the mounting base to rotate together, achieving circumferential locking.
It effectively absorbs equipment vibration, prevents the dynamic ring from separating from the mounting base or breaking, ensures sealing effect, and improves the durability and reliability of mechanical seals.
Smart Images
Figure CN224592689U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical seal technology and relates to a shock-absorbing and anti-detachment mechanical seal. 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 existing mechanical seals, the friction pair (such as the rotating ring) is generally fixed to the metal seat by mounting, and the two are rigidly connected. However, equipment using this type of mechanical seal will inevitably vibrate during operation. Prolonged vibration can cause the friction pair to separate from the metal seat (e.g., the adhesive joint cracks or loosens), leading to mechanical seal failure. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a shock-absorbing and anti-detachment mechanical seal.
[0006] The objective of this utility model can be achieved through the following technical solution: a shock-absorbing and anti-dislodgement mechanical seal, comprising:
[0007] A stationary ring assembly, the stationary ring assembly including a stationary ring seat and a stationary ring, the stationary ring being disposed in the stationary ring seat;
[0008] A rotating ring assembly includes an annular outer cover, an annular transmission sleeve, and a rotating ring. The annular transmission sleeve is disposed inside the annular outer cover and the two are coaxially arranged. The annular transmission sleeve and the annular outer cover form an inlay base. The annular outer cover and the annular transmission sleeve are circumferentially locked. An annular inlay cavity is reserved between the annular transmission sleeve and the annular outer cover. The rotating ring is disposed in the inlay cavity. The stationary ring is tightly fitted with the rotating ring.
[0009] A first O-ring is provided between the moving ring and the annular transmission sleeve, and the first O-ring is interference-fitted with the moving ring. The moving ring is floatingly connected to the annular transmission sleeve through the first O-ring. A second O-ring is provided between the moving ring and the annular outer cover, and the second O-ring is interference-fitted with the moving ring. The moving ring is floatingly connected to the annular outer cover and circumferentially locked through the second O-ring.
[0010] Preferably, the stationary ring is disposed on the end face of the stationary ring seat, and a third O-ring is disposed on the outer peripheral surface of the stationary ring seat.
[0011] Preferably, the annular transmission sleeve is provided with a shaft hole for the rotating shaft to pass through, and a fourth O-ring is provided in the shaft hole.
[0012] Preferably, the shaft hole is configured as a stepped hole structure, a bushing is provided in the large hole portion of the shaft hole, the fourth O-ring is provided in the large hole portion of the shaft hole, and the fourth O-ring is located between the stepped surface of the shaft hole and the end face of the bushing.
[0013] Preferably, the end face of the annular transmission sleeve is provided with an elastic element, the elastic element abuts against the moving ring, and the elastic element applies pressure to the moving ring toward the stationary ring.
[0014] Preferably, the inner circumferential surface of the annular outer cover is provided with an annular groove, the number of the annular grooves being consistent with the number of the second O-rings and arranged in a one-to-one correspondence, and the second O-rings being disposed in the annular grooves.
[0015] Preferably, there are two annular grooves and two second O-rings, and the annular grooves are distributed sequentially along the axial direction of the moving ring.
[0016] Preferably, the moving ring is provided with an inner hole, the inner hole is configured as a stepped hole structure, the annular transmission sleeve is configured as a stepped shaft structure, and the first O-ring is located between the stepped surface of the inner hole and the stepped surface of the annular transmission sleeve.
[0017] Preferably, the annular outer cover and the annular transmission sleeve are circumferentially locked by screws or transmission pins.
[0018] Preferably, the annular outer cover and the stationary ring seat are arranged sequentially along the axial direction of the shaft hole.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0020] 1. An O-ring is installed between the rotating ring and the transmission seat and the rotating ring seat to absorb vibration, so that the rotating ring can be floated and installed in the mounting cavity, so that the rotating ring will not fail due to mechanical vibration during operation.
[0021] 2. The first O-ring and the second O-ring can also ensure the seal between the rotating ring and the annular transmission sleeve and the annular outer cover, and drive the rotating ring and the mounting base to rotate together through the friction between the O-ring and the rotating ring, thereby playing a circumferential locking role between the rotating ring and the mounting base.
[0022] 3. Designing the mounting base as a split structure (divided into an annular outer cover and an annular transmission sleeve) facilitates the installation of the first and second O-rings. During installation, the first O-ring can be installed onto the outer circumference of the annular transmission sleeve first, and the second O-ring onto the inner circumference of the annular outer cover. Then, the moving ring is fitted onto the annular transmission sleeve, and the annular outer cover is fitted onto the moving ring. Finally, the annular outer cover and the annular transmission sleeve are locked together with screws or transmission pins, thus completing the assembly of the moving ring assembly. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the shock-absorbing and anti-detachment mechanical seal of this utility model.
[0024] Figure 2 This is a schematic diagram of the structure of the dynamic ring assembly of this utility model.
[0025] In the diagram, 100 is the stationary ring seat; 110 is the stationary ring; 120 is the third O-ring; 200 is the mounting base; 210 is the annular outer cover; 211 is the annular groove; 220 is the annular transmission sleeve; 221 is the shaft hole; 222 is the fourth O-ring; 223 is the bushing; 224 is the elastic element; 230 is the moving ring; 231 is the inner hole; 240 is the mounting cavity; 250 is the first O-ring; and 260 is the second O-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 shock-absorbing and anti-disengagement mechanical seal includes:
[0028] A stationary ring assembly, comprising a stationary ring seat 100 and a stationary ring 110, wherein the stationary ring 110 is disposed in the stationary ring seat 100;
[0029] The rotating ring assembly includes an annular outer cover 210, an annular transmission sleeve 220, and a rotating ring 230. The annular transmission sleeve 220 is disposed inside the annular outer cover 210 and the two are coaxially arranged. The annular transmission sleeve 220 and the annular outer cover 210 form an inlay base 200. The annular outer cover 210 and the annular transmission sleeve 220 are circumferentially locked. An annular inlay cavity 240 is reserved between the annular transmission sleeve 220 and the annular outer cover 210. The rotating ring 230 is disposed inside the inlay cavity 240. The stationary ring 110 is tightly fitted with the rotating ring 230.
[0030] A first O-ring 250 is provided between the moving ring 230 and the annular transmission sleeve 220. The first O-ring 250 is interference-fitted with the moving ring 230, and the moving ring 230 is floatingly connected to the annular transmission sleeve 220 through the first O-ring 250. A second O-ring 260 is provided between the moving ring 230 and the annular outer cover 210. The second O-ring 260 is interference-fitted with the moving ring 230, and the moving ring 230 is floatingly connected to the annular outer cover 210 and circumferentially locked through the second O-ring 260.
[0031] In the rotating ring assembly, both the annular outer cover 210 and the annular transmission sleeve 220 are annular components, which together form the mounting base 200. The rotating ring 230 is mounted in the mounting cavity 240 of the mounting base 200. The rotating ring 230 and the mounting base 200 (the annular outer cover 210 and the annular transmission sleeve 220) are not rigidly connected, but are floatingly connected to the mounting base 200 through the first O-ring 250 and the second O-ring 260. This floating design allows the rotating ring 230 to move slightly within the mounting cavity 240 of the mounting base 200, thereby absorbing the vibration generated by the equipment. This ensures that the rotating ring 230 and the mounting base 200 remain fixed, while also eliminating the risk of the rotating ring 230 separating from the mounting base 200 or the rotating ring 230 breaking due to vibration.
[0032] The primary function of the first O-ring 250 and the second O-ring 260 is to absorb the vibration energy of the equipment and prevent the vibration energy from being transmitted to the moving ring 230. That is, the first O-ring 250 and the second O-ring 260 serve as a flexible vibration isolation structure, and the interference fit of the O-rings clamps the moving ring 230 within the mounting cavity 240, so that even if the equipment vibrates violently, the moving ring 230 will not detach from the mounting base 200.
[0033] In addition, the first O-ring 250 and the second O-ring 260 can also ensure the seal between the moving ring 230 and the annular transmission sleeve 220 and the annular outer cover 210, and drive the moving ring 230 and the mounting base 200 to rotate together through the friction between the O-ring and the moving ring 230, thereby playing a circumferential locking role between the moving ring 230 and the mounting base 200.
[0034] It should be noted that if the mounting base 200 is a single unit, it would be difficult to install the first O-ring 250 and the second O-ring 260 into the mounting cavity 240. Designing the mounting base 200 as a split structure (divided into an annular outer cover 210 and an annular transmission sleeve 220) facilitates the installation of the first O-ring 250 and the second O-ring 260.
[0035] During installation, the first O-ring 250 can be installed on the outer circumferential surface of the annular transmission sleeve 220, the second O-ring 260 can be installed on the inner circumferential surface of the annular outer cover 210, the moving ring 230 can be fitted onto the annular transmission sleeve 220, and the annular outer cover 210 can be fitted onto the moving ring 230. Then, the annular outer cover 210 and the annular transmission sleeve 220 can be locked together by screws or transmission pins, thereby completing the assembly of the moving ring assembly.
[0036] like Figure 1 As shown, based on the above embodiment, a stationary ring 110 is disposed on the end face of a stationary ring seat 100, and a third O-ring 120 is disposed on the outer peripheral surface of the stationary ring seat 100.
[0037] The third O-ring 120 forms a radial interference fit with the mounting hole of the equipment sealing cavity. While achieving zero leakage sealing of high-pressure fluid between the stationary ring seat 100 and the cavity, the vibration energy transmitted to the stationary ring assembly is significantly attenuated through the viscoelastic damping effect of the rubber material.
[0038] like Figure 1 , Figure 2 As shown, based on the above embodiment, the annular transmission sleeve 220 is provided with a shaft hole 221 for the rotating shaft to pass through, and a fourth O-ring 222 is provided in the shaft hole 221.
[0039] After the mechanical seal is installed in place, the fourth O-ring 222 is interference-fitted with the shaft. The function of this fourth O-ring 222 is to allow the shaft to rotate without keying through the friction transmission mechanism between the rubber and metal interfaces, so as to realize the synchronous drive of the rotating ring assembly.
[0040] Based on the above embodiments, the shaft hole 221 is configured as a stepped hole structure, a bushing 223 is provided in the large hole portion of the shaft hole 221, a fourth O-ring 222 is provided in the large hole portion of the shaft hole 221, and the fourth O-ring 222 is located between the stepped surface of the shaft hole 221 and the end face of the bushing 223.
[0041] The stepped surface of the shaft hole 221 and the end face of the bushing 223 form a rigid retaining wall, which restricts the axial degree of freedom of the fourth O-ring 222.
[0042] like Figure 1As shown, based on the above embodiment, an elastic element 224 is provided on the end face of the annular transmission sleeve 220. The elastic element 224 abuts against the moving ring 230 and applies pressure to the moving ring 230 toward the stationary ring 110.
[0043] The elastic element 224 applies axial pressure to push the rotating ring 230 toward the stationary ring 110, ensuring that the end faces of the rotating ring 230 and the stationary ring 110 remain in tight contact. This is the fundamental condition for achieving zero leakage in a mechanical seal. During long-term operation, the rotating ring 230 and the stationary ring 110 will experience minor wear due to friction. The elastic deformation capability of the elastic element 224 (such as the compression of a spring or the bending of a bellows) can automatically compensate for this wear, maintaining the contact pressure and fit of the sealing surfaces.
[0044] like Figure 1 , Figure 2 As shown, based on the above embodiment, the inner circumferential surface of the annular outer cover 210 is provided with an annular groove 211. The number of annular grooves 211 is the same as the number of second O-rings 260 and they are arranged in a one-to-one correspondence. The second O-rings 260 are disposed in the annular grooves 211.
[0045] Based on the above implementation, there are two annular grooves 211 and two second O-rings 260, with the annular grooves 211 distributed sequentially along the axial direction of the moving ring 230.
[0046] For ease of installation, two annular grooves are provided on the outer circumferential surface of the moving ring 230, with the two annular grooves corresponding to the two annular slots 211 respectively, and the second O-ring 260 is interference-fitted with the annular grooves.
[0047] like Figure 1 As shown, during installation, a second O-ring 260 can be first installed into the annular groove 211 on the left side. Then, the annular outer cover 210 is fitted onto the moving ring 230 from left to right. As the annular outer cover 210 is fitted, the second O-ring 260 enters the annular slot on the left side. After the annular outer cover 210 is installed, another second O-ring 260 is inserted from the opening of the mounting cavity 240 into the annular groove 211 on the right side and between the annular slot.
[0048] like Figure 1 , Figure 2 As shown, based on the above embodiment, the moving ring 230 is provided with an inner hole 231, which is configured as a stepped hole structure. The annular transmission sleeve 220 is configured as a stepped shaft structure, and the first O-ring 250 is located between the stepped surface of the inner hole 231 and the stepped surface of the annular transmission sleeve 220. The first O-ring 250 can be axially constrained through the two stepped surfaces.
[0049] Based on the above embodiments, the annular outer cover 210 and the annular transmission sleeve 220 are circumferentially locked by screws or transmission pins.
[0050] Based on the above embodiments, the annular outer cover 210 and the stationary ring seat 100 are arranged sequentially along the axial direction of the shaft hole 221.
[0051] 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.
[0052] 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.
[0053] 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.
[0054] 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 shock-absorbing and anti-detachment mechanical seal, characterized in that, include: A stationary ring assembly, the stationary ring assembly including a stationary ring seat (100) and a stationary ring (110), the stationary ring (110) being disposed in the stationary ring seat (100); A rotating ring assembly includes an annular outer cover (210), an annular transmission sleeve (220), and a rotating ring (230). The annular transmission sleeve (220) is disposed inside the annular outer cover (210) and the two are coaxially arranged. The annular transmission sleeve (220) and the annular outer cover (210) form an inlay base (200). The annular outer cover (210) and the annular transmission sleeve (220) are circumferentially locked. An annular inlay cavity (240) is reserved between the annular transmission sleeve (220) and the annular outer cover (210). The rotating ring (230) is disposed inside the inlay cavity (240). The stationary ring (110) is tightly fitted with the rotating ring (230). A first O-ring (250) is provided between the moving ring (230) and the annular transmission sleeve (220). The first O-ring (250) is interference-fitted with the moving ring (230), and the moving ring (230) is floatingly connected to the annular transmission sleeve (220) through the first O-ring (250). A second O-ring (260) is provided between the moving ring (230) and the annular outer cover (210). The second O-ring (260) is interference-fitted with the moving ring (230), and the moving ring (230) is floatingly connected to the annular outer cover (210) and circumferentially locked through the second O-ring (260).
2. The shock-absorbing and anti-disengagement mechanical seal as described in claim 1, characterized in that: The stationary ring (110) is disposed on the end face of the stationary ring seat (100), and a third O-ring (120) is disposed on the outer peripheral surface of the stationary ring seat (100).
3. A shock-absorbing and anti-disengagement mechanical seal as described in claim 1 or 2, characterized in that: The annular transmission sleeve (220) is provided with a shaft hole (221) for the rotating shaft to pass through, and a fourth O-ring (222) is provided in the shaft hole (221).
4. The shock-absorbing and anti-disengagement mechanical seal as described in claim 3, characterized in that: The shaft hole (221) is configured as a stepped hole structure. A bushing (223) is provided in the large hole portion of the shaft hole (221). The fourth O-ring (222) is provided in the large hole portion of the shaft hole (221), and the fourth O-ring (222) is located between the stepped surface of the shaft hole (221) and the end face of the bushing (223).
5. A shock-absorbing and anti-disengagement mechanical seal as described in claim 1, characterized in that: The end face of the annular transmission sleeve (220) is provided with an elastic element (224), the elastic element (224) abuts against the moving ring (230), and the elastic element (224) applies pressure to the moving ring (230) toward the stationary ring (110).
6. The shock-absorbing and anti-disengagement mechanical seal as described in claim 1, characterized in that: The inner circumferential surface of the annular outer cover (210) is provided with an annular groove (211), the number of the annular grooves (211) is consistent with the number of the second O-rings (260) and is provided in a one-to-one correspondence, and the second O-rings (260) are provided in the annular grooves (211).
7. A shock-absorbing and anti-disengagement mechanical seal as described in claim 6, characterized in that: The number of the annular groove (211) and the second O-ring (260) are both two, and the annular groove (211) is distributed sequentially along the axial direction of the moving ring (230).
8. A shock-absorbing and anti-disengagement mechanical seal as described in claim 1, characterized in that: The moving ring (230) is provided with an inner hole (231), the inner hole (231) is configured as a stepped hole structure, the annular transmission sleeve (220) is configured as a stepped shaft structure, and the first O-ring (250) is located between the stepped surface of the inner hole (231) and the stepped surface of the annular transmission sleeve (220).
9. A shock-absorbing and anti-disengagement mechanical seal as described in claim 1, characterized in that: The annular outer cover (210) and the annular transmission sleeve (220) are circumferentially locked by screws or transmission pins.
10. A shock-absorbing and anti-disengagement mechanical seal as described in claim 3, characterized in that: The annular outer cover (210) and the stationary ring seat (100) are arranged sequentially along the axial direction of the shaft hole (221).