Double-end inflatable mechanical seal
By using a rigid rotating seat and push ring structure, combined with a perfluoroether rubber O-ring and air inflation, the problem of easy deformation and aging of the rotating ring is solved, achieving a mechanical seal effect with high efficiency and long service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG TELING FLUID MACHINERY CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-06-09
AI Technical Summary
In existing mechanical seals, the fixed connection between the rotating ring and the cup makes them prone to deformation and aging at high temperatures, resulting in a decline in sealing performance.
It adopts a rigid rotating seat and push ring structure, combined with a perfluoroether rubber O-ring, and pressurizes through air inlet and outlet holes to prevent the rotating ring from rotating and improve the sealing performance.
This ensures that the rotating ring does not rotate, improves sealing performance, extends service life, prevents material leakage, and enhances sealing effect.
Smart Images
Figure CN224339480U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical seals, specifically a double-end-face inflatable mechanical seal. Background Technology
[0002] Mechanical seals are a common type of sealing device, typically consisting of a stationary ring, a rotating ring, an elastic compensator, and a sealing element. The stationary and rotating rings form a friction pair, with the rotating ring pressed against the end face of the stationary ring by the elastic compensator.
[0003] For example, patent CN218625429U discloses a split-type mechanical seal, belonging to the field of mechanical seal technology. This utility model includes an inner end cap, sealing rings disposed on both sides of the inner end cap, two symmetrically arranged rotating rings, an outer end cap, and a cup sandwiched between the two rotating rings. The outer circumference of the cup is provided with several protruding structures, and the inner circumference of the rotating rings is provided with grooves matching the protruding structures.
[0004] The aforementioned patent utilizes the elastic potential energy of the diaphragm cup under the pressure of the two rotating rings, providing a buffering and compensation function for the rotating rings. Furthermore, the diaphragm cup expands in the diaphragm direction, enhancing the seal between it and the drive shaft. This solves the technical problem of traditional mechanical seals, which use springs and rotating ring seals, resulting in complex structures and susceptibility to damage. However, the patent has a drawback: in this patent, the pair of rotating rings are fixedly connected to the shaft via the diaphragm cup. This leads to the diaphragm cup easily deforming and aging due to high temperatures after use, causing the rotating rings to rotate relative to the diaphragm cup, thus reducing the sealing performance.
[0005] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Utility Model Content
[0006] The purpose of this invention is to provide a double-end-face inflatable mechanical seal to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A double-end inflatable mechanical seal includes a rotating seat; the rotating seat is fixedly mounted on a rotating shaft, and a first rotating ring and a second rotating ring are respectively provided at the upper and lower ends of the rotating seat. The upper end of the first rotating ring abuts against the lower end of the upper end cover, and the lower end of the second rotating ring abuts against the upper end of the lower end cover; the upper and lower ends of the rotating shaft pass through the upper and lower end covers respectively; the upper and lower end covers are fixedly connected by an intermediate end cover, and at least two air inlet and outlet holes are provided on the side of the intermediate end cover; a first push ring and a second push ring are respectively provided at the upper and lower ends of the rotating seat, and the first and second push rings are used to install the first rotating ring and the second rotating ring respectively; a plurality of compression springs are also provided between the first and second push rings, and the mounting seat is provided with mounting holes for the compression springs to be installed and pass through; the upper and lower ends of the compression springs abut against the first and second push rings respectively.
[0009] Furthermore, both the upper and lower end caps are made of stainless steel, while the first and second moving rings are both made of polytetrafluoroethylene.
[0010] Furthermore, a third O-ring is provided between the upper and lower ends of the intermediate end cap and the upper and lower end caps for sealing among the three.
[0011] Furthermore, a first O-ring is provided between the first push ring, the first moving ring, and the rotating shaft; similarly, a second O-ring is provided between the second push ring, the second moving ring, and the rotating shaft, and both the first O-ring and the second O-ring are made of perfluoroether rubber.
[0012] Furthermore, one end of the rotating seat is provided with a plurality of first guide countersunk holes, and the lower end of the first push ring is fixedly connected with a plurality of first guide screws. The first guide screws pass through the first guide countersunk holes and are fixedly connected to the first push ring. The first guide screws and the first guide countersunk holes are configured to prevent the first push ring from rotating relative to the rotating seat, so that the first push ring can only move up and down relative to the rotating seat.
[0013] Furthermore, the other end of the rotating seat is provided with a plurality of second guide countersunk holes, and the upper end of the second push ring is fixedly connected with a plurality of second guide screws. The second guide screws pass through the second guide countersunk holes and are fixedly connected to the second push ring. The second guide screws and the second guide countersunk holes are configured to prevent the second push ring from rotating relative to the rotating seat, so that the second push ring can only move up and down relative to the rotating seat.
[0014] Furthermore, the top of the first push ring is fixedly connected with a number of first pins, and correspondingly, the lower end of the first moving ring is provided with a number of first guide grooves, with the first pins located in the first guide grooves.
[0015] Furthermore, the bottom of the second push ring is fixedly connected with several second pins, and correspondingly, the top of the second moving ring is provided with several second guide grooves, and the second pins are located in the second guide grooves.
[0016] Furthermore, it also includes a mounting ring, the inner ring of which is provided with an abutment ring, and the lower end cover is fixedly installed on the top of the mounting ring; the top of the lower end cover is provided with a plurality of countersunk holes for installation; the mounting ring is provided with a plurality of threaded holes, the top of the lower end cover is also provided with a plurality of threaded holes, the middle end cover is also provided with a plurality of first connecting through holes, and the upper end cover is provided with a plurality of second connecting through holes; the threaded holes, first connecting through holes and second connecting through holes on the top of the lower end cover are provided in a one-to-one correspondence.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] Using a rigid rotating seat and push ring ensures that the rotating ring does not rotate relative to the rotating seat, thus guaranteeing sealing performance.
[0019] Using O-rings made of perfluoroether rubber as the seal at the moving ring has high high temperature resistance, which can improve the service life of the mechanical seal.
[0020] By connecting an external air source through the air inlet and outlet holes on the side of the middle end cover, the mechanical seal can be pressurized and inflated, preventing material or impurities from the equipment side from leaking into the sealing device and further improving the sealing effect of the sealing device. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a double-end-face inflatable mechanical seal.
[0022] Figure 2 This is a front view of a double-end inflatable mechanical seal.
[0023] Figure 3 This is a side view of a double-end inflatable mechanical seal.
[0024] Figure 4 This is a top view of a double-end-face inflatable mechanical seal.
[0025] Figure 5 for Figure 2 Sectional view along the AA direction.
[0026] Figure 6 for Figure 3 Sectional view along the BB direction.
[0027] Figure 7 for Figure 4 A cross-sectional view along the CC direction.
[0028] Figure 8for Figure 4 Sectional view along the DD direction.
[0029] Figure 9 This is a schematic diagram of the rotating seat in a double-end-face inflatable mechanical seal. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0031] Please see Figure 1-9 A double-end-face inflatable mechanical seal includes a rotating seat 100; the rotating seat 100 is fixedly mounted on a rotating shaft 900, and a first rotating ring 200 and a second rotating ring 300 are respectively provided at the upper and lower ends of the rotating seat 100. The upper end of the first rotating ring 200 abuts against the lower end of the upper end cover 400, and the lower end of the second rotating ring 300 abuts against the upper end of the lower end cover 500. The upper end cover 400 and the lower end cover 500 actually act as stationary rings, and cooperate with the rotating rings to form an end-face friction pair to achieve the fluid sealing function; and the upper and lower ends of the rotating shaft 900 respectively extend through the upper end cover 400 and the lower end cover 500.
[0032] The upper end cover 400 and the lower end cover 500 are both made of 304 stainless steel, while the first moving ring 200 and the second moving ring 300 are both made of polytetrafluoroethylene.
[0033] The upper end cover 400 and the lower end cover 500 are fixedly connected by an intermediate end cover 600. At the same time, a third O-ring 601 is provided between the upper end cover 400 and the lower end cover 500 at both ends of the intermediate end cover 600 for sealing between the three. At the same time, at least two air inlet and outlet holes 602 are provided on the side of the intermediate end cover 600.
[0034] Specifically, the upper and lower ends of the rotating seat 100 are respectively provided with a first push ring 101 and a second push ring 102, and the first push ring 101 and the second push ring 102 are respectively used to install the first moving ring 200 and the second moving ring 300; the rotating seat, the first push ring and the second push ring are all made of hard metal material.
[0035] In this design, one end of the rotating seat 100 is provided with a plurality of first guide countersunk holes 202, and the lower end of the first push ring 101 is fixedly connected with a plurality of first guide screws 203. The first guide screws 203 pass through the first guide countersunk holes 202 and are fixedly connected to the first push ring 101. The first guide screws 203 and the first guide countersunk holes 202 are configured to prevent the first push ring 101 from rotating relative to the rotating seat 100, so that the first push ring 101 can only move up and down relative to the rotating seat 100.
[0036] The other end of the rotating seat 100 is provided with a plurality of second guide countersunk holes 302, and the upper end of the second push ring 102 is fixedly connected with a plurality of second guide screws 303. The second guide screws 303 pass through the second guide countersunk holes 302 and are fixedly connected to the second push ring 102. The second guide screws 303 and the second guide countersunk holes 302 are configured to prevent the second push ring 102 from rotating relative to the rotating seat 100, so that the second push ring 102 can only move up and down relative to the rotating seat 100.
[0037] In this design, a plurality of first pins 204 are fixedly connected to the top of the first push ring 101. Correspondingly, a plurality of first guide grooves 205 are provided at the lower end of the first moving ring 200, and the first pins 204 are located in the first guide grooves 205. The function of the first pins 204 and the first guide grooves 205 is to prevent the first moving ring 200 from rotating relative to the first push ring 101.
[0038] The bottom of the second push ring 102 is fixedly connected with a number of second pins 304. Correspondingly, the top of the second moving ring 300 is provided with a number of second guide grooves 305. The second pins 304 are located in the second guide grooves 305. The second pins 304 and the second guide grooves 305 are configured to prevent the second moving ring 300 from rotating relative to the second push ring 102.
[0039] like Figure 7 As shown, in this design, in order to create an axial thrust between the moving ring and the stationary ring, ensuring a tight fit between them, a plurality of compression springs 103 are provided between the first push ring 101 and the second push ring 102. The mounting base 100 has mounting holes 104 for the compression springs 103 to be installed and pass through. The upper and lower ends of the compression springs 103 abut against the first push ring 101 and the second push ring 102, respectively.
[0040] In this design, to maintain the seal between the first push ring 101, the first moving ring 200, and the rotating shaft 900, a first O-ring 901 is also provided between the first push ring 101, the first moving ring 200, and the rotating shaft 900; similarly, a second O-ring 902 is also provided between the second push ring 102, the second moving ring 300, and the rotating shaft 900 for sealing between the second push ring 102, the second moving ring 300, and the rotating shaft 900.
[0041] Meanwhile, in this solution, since the friction points of the first O-ring 901 and the second O-ring 902 with the moving ring are close and the temperature is high, the first O-ring 901 and the second O-ring 902 are both made of perfluoroether rubber. Perfluoroether rubber has high high temperature resistance, can adapt to application scenarios, and improve the service life of mechanical seals.
[0042] In this solution, when using it, a mounting ring 800 is first welded to the installation location, and a polytetrafluoroethylene (PTFE) abutment ring 700 is placed on the inner ring of the mounting ring 800. The abutment ring 700 mainly serves to protect the lower end cover 500. Then, the lower end cover 500 is fixedly installed on the top of the mounting ring 800 with screws. Next, the second moving ring 300, the rotating seat 100, and the first moving ring 200 are installed on the rotating shaft 900. Finally, the middle end cover 600 and the upper end cover 400 are fixedly installed on top of the lower end cover 500 with screws.
[0043] like Figure 8 As shown, in this design, the top of the lower end cover 500 is provided with several countersunk holes 501 for installation; the mounting ring 800 is provided with several threaded holes.
[0044] The screw passes through the countersunk hole 501 on the lower end cap 500 and is threaded into the threaded hole on the mounting ring 800.
[0045] The top of the lower end cover 500 is also provided with several threaded holes, the middle end cover 600 is also provided with several first connecting through holes 603, and the upper end cover 400 is provided with several second connecting through holes 401; the threaded holes, first connecting through holes 603 and second connecting through holes 401 on the top of the lower end cover 500 are provided in a one-to-one correspondence.
[0046] During fixing, the screw passes through the second connecting through hole 401 and the first connecting through hole 603 in sequence and is threaded into the threaded hole on the top of the lower end cover 500.
[0047] Meanwhile, when this utility model is in use, by connecting an external air source through the air inlet / outlet 602 on the side of the middle end cover 600, the mechanical seal can be pressurized. When the air pressure inside the mechanical seal is greater than the material pressure on the equipment side, it can prevent material or impurities on the equipment side from leaking into the sealing device, thereby further improving the sealing effect of the sealing device.
[0048] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
Claims
1. A double-end-face inflatable mechanical seal, comprising a rotating seat; the rotating seat is fixedly mounted on a rotating shaft, and a first rotating ring and a second rotating ring are respectively provided at the upper and lower ends of the rotating seat, the upper end of the first rotating ring abutting against the lower end of the upper end cover, and the lower end of the second rotating ring abutting against the upper end of the lower end cover; and the upper and lower ends of the rotating shaft respectively extend through the upper end cover and the lower end cover; characterized in that, The upper and lower end caps are fixedly connected by an intermediate end cap, and the side of the intermediate end cap is provided with at least two air inlet and outlet holes; the upper and lower ends of the rotating seat are respectively provided with a first push ring and a second push ring, which are used to install a first moving ring and a second moving ring, respectively; a number of compression springs are also provided between the first push ring and the second push ring, and the mounting seat is provided with mounting holes for the compression springs to be installed and pass through; the upper and lower ends of the compression springs abut against the first push ring and the second push ring, respectively.
2. The double-end-face inflatable mechanical seal according to claim 1, characterized in that, Both the upper and lower end caps are made of stainless steel, while the first and second moving rings are made of polytetrafluoroethylene.
3. The double-end-face inflatable mechanical seal according to claim 1, characterized in that, A third O-ring is also provided between the upper and lower ends of the middle end cap and between the upper and lower end caps.
4. The double-end-face inflatable mechanical seal according to claim 1, characterized in that, A first O-ring is provided between the first push ring, the first moving ring and the rotating shaft; a second O-ring is provided between the second push ring, the second moving ring and the rotating shaft, and both the first O-ring and the second O-ring are made of perfluoroether rubber.
5. The double-end-face inflatable mechanical seal according to claim 1, characterized in that, One end of the rotating seat is provided with a plurality of first guide countersunk holes, and the lower end of the first push ring is fixedly connected with a plurality of first guide screws. The first guide screws pass through the first guide countersunk holes and are fixedly connected to the first push ring. The first guide screws and the first guide countersunk holes are configured to prevent the first push ring from rotating relative to the rotating seat, so that the first push ring can only move up and down relative to the rotating seat.
6. The double-end-face inflatable mechanical seal according to claim 5, characterized in that, The other end of the rotating seat is provided with a plurality of second guide countersunk holes, and the upper end of the second push ring is fixedly connected with a plurality of second guide screws. The second guide screws pass through the second guide countersunk holes and are fixedly connected to the second push ring. The second guide screws and the second guide countersunk holes are configured to prevent the second push ring from rotating relative to the rotating seat, so that the second push ring can only move up and down relative to the rotating seat.
7. The double-end-face inflatable mechanical seal according to claim 1, characterized in that, The top of the first push ring is fixedly connected with several first pins, and correspondingly, the lower end of the first moving ring is provided with several first guide grooves, with the first pins located in the first guide grooves.
8. The double-end-face inflatable mechanical seal according to claim 7, characterized in that, The bottom of the second push ring is fixedly connected with several second pins. Correspondingly, the top of the second moving ring is provided with several second guide grooves, and the second pins are located in the second guide grooves.
9. The double-end-face inflatable mechanical seal according to claim 1, characterized in that, It also includes a mounting ring, the inner ring of which is provided with an abutment ring, and the lower end cover is fixedly installed on the top of the mounting ring; the top of the lower end cover is provided with several countersunk holes for installation; the mounting ring is provided with several threaded holes, the top of the lower end cover is also provided with several threaded holes, the middle end cover is also provided with several first connecting through holes, and the upper end cover is provided with several second connecting through holes; the threaded holes, first connecting through holes and second connecting through holes on the top of the lower end cover are provided in a one-to-one correspondence.