Double-end-face packaging type mechanical seal
By setting a water-throwing groove on the moving ring seat and using the rotating shaft to drive the cooling water flow, the problem of needing an external pumping ring in the prior art is solved, the structure is simplified and the circulation of cooling water is realized.
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
- 2026-05-05
AI Technical Summary
Existing double-end mechanical seals require an external pumping ring to achieve water circulation during cooling, which increases structural complexity.
The rotating ring seat with a water-throwing groove is used as the power mechanism for cooling water. The rotating shaft drives the rotating ring seat to rotate and make the cooling water flow, which simplifies the structure and eliminates the need for an external water pump.
It enables the circulation of cooling water, simplifies the structure, and avoids the use of additional parts.
Smart Images
Figure CN224201124U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical seals, specifically a double-end face cartridge mechanical seal. Background Technology
[0002] A mechanical seal is a device that prevents fluid leakage by maintaining contact and relative sliding between at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure, the elastic force of a compensation mechanism, and the cooperation of an auxiliary seal. Mechanical seals are widely used in industrial equipment, such as pumps, compressors, mixers, and other rotating shaft machinery, playing a crucial role in controlling leakage between rotating shafts and stationary parts.
[0003] For example, patent CN216742833U discloses a double-end mechanical seal, including a bushing, a gland, and a water tank. A rotating ring seat is fitted on the bushing, and a spring is installed inside the rotating ring seat. An inner rotating ring and an outer rotating ring are connected to the rotating ring seat. An inner stationary ring and an outer stationary ring are connected to the gland. The outer rotating ring contacts the outer stationary ring, and the inner rotating ring contacts the inner stationary ring. An annular sealing cavity is formed between the inner stationary ring, the inner rotating ring, the rotating ring seat, the outer rotating ring, the outer stationary ring, and the gland. The gland has an inlet hole and an outlet hole, both of which are connected to the water tank. A pumping ring is installed inside the sealing cavity and is fixed on the rotating ring seat. The position of the pumping ring corresponds to that of the outlet hole. The pumping ring provides power to discharge water that enters the sealing cavity from the inlet hole through the outlet hole.
[0004] The aforementioned patent does not require external power for cooling the mechanical seal, thus avoiding the possibility of the pump cavitating and burning the mechanical seal. However, the disadvantage of the aforementioned patent is that a pumping ring needs to be installed on the moving ring seat to achieve water circulation, which adds an extra part and increases the complexity of the structure.
[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 cartridge 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 face cartridge mechanical seal includes a shaft sleeve and an end cover. The shaft sleeve is fixedly mounted on a rotating shaft. An atmospheric end rotating ring and a medium end rotating ring are respectively fixedly installed at the upper and lower ends of the shaft sleeve. The end cover is sleeved on the shaft sleeve, and an atmospheric end stationary ring and a medium end stationary ring are respectively fixedly installed at the upper and lower ends of the end cover's inner cavity. The atmospheric end rotating ring abuts against the atmospheric end stationary ring, and the medium end rotating ring abuts against the medium end stationary ring.
[0009] The upper outer wall of the end cap is provided with a water inlet, and the lower outer wall of the end cap is provided with a water outlet. Both the water inlet and the water outlet are connected to the inner cavity of the end cap.
[0010] The upper end of the bushing is fitted with a first moving ring seat, and an atmospheric moving ring is fixedly installed on the upper end of the first moving ring seat; the lower end of the bushing is fitted with a second moving ring seat, and the lower end of the second moving ring seat is fitted with a medium moving ring; the outer wall of the medium moving ring is also provided with a plurality of guide grooves, and the inner side of the second moving ring seat is provided with a plurality of guide blocks that cooperate with the guide grooves;
[0011] The outer wall of the second moving ring seat is provided with several water-throwing grooves; the inner cavity of the end cover is provided with a flow guiding cavity at the corresponding second moving ring seat, and the water outlet is located at the flow guiding cavity.
[0012] Furthermore, a retaining ring groove is provided on the outer wall of the upper end of the bushing, and a retaining spring is fitted in the retaining ring groove; a retaining ring is also fitted on the upper end of the bushing, and the upper end of the retaining ring abuts against the retaining spring.
[0013] Furthermore, the side wall of the fixing ring is provided with several fixing threaded holes, and the upper end of the bushing is also provided with several deformation grooves.
[0014] Furthermore, a first O-ring is provided between the inner wall of the lower end of the bushing and the outer wall of the shaft for sealing between the bushing and the shaft.
[0015] Furthermore, a first stationary ring mounting portion is provided at the upper end of the end cap inner cavity, an atmospheric stationary ring is installed at the first stationary ring mounting portion, and a second O-ring is installed between the outer wall of the atmospheric stationary ring and the first stationary ring mounting portion for sealing between the two.
[0016] Furthermore, a second stationary ring mounting portion is provided at the lower end of the end cap inner cavity, a medium end stationary ring is installed at the second stationary ring mounting portion, and a third O-ring is installed between the upper end of the outer wall of the medium end stationary ring and the first stationary ring mounting portion for sealing between the two.
[0017] Furthermore, a fifth O-ring is provided between the inner wall of the medium end moving ring and the outer wall of the rotating shaft.
[0018] Furthermore, a plurality of first compression springs are provided between the ends of the medium end rotating ring and the second rotating ring seat; a second compression spring is also provided between the second rotating ring seat and the first rotating ring seat.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] In the prior art, the limiting and anti-rotation between the rotating ring and the rotating ring seat is generally achieved by locating pins; the guide block and guide groove prevent the rotating ring at the medium end from rotating relative to the second rotating ring seat. Compared with the prior art, this simplifies the structure and reduces the use of locating pins.
[0021] The design incorporates a water-spraying groove on the side of the second moving ring seat, which simplifies the structure. Furthermore, using the second moving ring seat with the water-spraying groove as the power mechanism to drive the cooling water flow eliminates the need for an external water pump. Attached Figure Description
[0022] Figure 1 This is a front view of a double-end-face cartridge mechanical seal.
[0023] Figure 2 This is a side view of a double-end face cartridge mechanical seal.
[0024] Figure 3 This is a top view of a double-end-face cartridge mechanical seal.
[0025] Figure 4 This is a schematic diagram of a double-end-face cartridge mechanical seal.
[0026] Figure 5 for Figure 2 Sectional view along the AA direction.
[0027] Figure 6 for Figure 1 Sectional view along the BB direction.
[0028] Figure 7 This is a schematic diagram of a double-end face cartridge mechanical seal installed on the media end mounting section.
[0029] Figure 8 for Figure 6 A magnified view of a portion of point a.
[0030] Figure 9 This is a schematic diagram of the structure of the bushing in a double-end-face cartridge mechanical seal.
[0031] Figure 10 This is a schematic diagram of the structure of the medium-end rotating ring and the second rotating ring seat in a double-end face cartridge mechanical seal. Detailed Implementation
[0032] 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.
[0033] Please see Figure 1-5 A double-end face cartridge mechanical seal includes a bushing 100 and an end cover 200. The bushing 100 is fixedly mounted on a rotating shaft 900. An atmospheric end moving ring 300 and a medium end moving ring 400 are fixedly installed at the upper and lower ends of the bushing 100, respectively. The end cover 200 is sleeved on the bushing 100. An atmospheric end stationary ring 500 and a medium end stationary ring 600 are fixedly installed at the upper and lower ends of the inner cavity of the end cover 200, respectively. The atmospheric end moving ring 300 abuts against the atmospheric end stationary ring 500, and the medium end moving ring 400 abuts against the medium end stationary ring 600.
[0034] like Figure 9 As shown, specifically, a retaining ring groove 101 is provided on the outer wall of the upper end of the bushing 100, and a retaining spring 102 is fitted on the retaining ring groove 101; a retaining ring 103 is also fitted on the upper end of the bushing 100, and the upper end of the retaining ring 103 abuts against the retaining spring 102.
[0035] Meanwhile, the side wall of the fixing ring 103 is provided with a plurality of fixing threaded holes 104, and the upper end of the bushing 100 is also provided with a plurality of deformation grooves 105. The deformation grooves 105 are mainly used so that when a screw (not shown in the figure) is screwed into the fixing threaded hole 104, the screw can press the upper end of the bushing 100, so that the upper end of the bushing 100 deforms and presses the rotating shaft 900, thereby fixing the bushing 100 on the rotating shaft 900; thereby preventing the bushing 100 from rotating relative to the rotating shaft 900.
[0036] In this solution, a first O-ring 901 is also provided between the inner wall of the lower end of the bushing 100 and the outer wall of the rotating shaft 900 for sealing between the bushing 100 and the rotating shaft 900.
[0037] The upper outer wall of the end cap 200 is provided with an inlet 210, and the lower outer wall of the end cap 200 is provided with an outlet 220. Both the inlet 210 and the outlet 220 are connected to the inner cavity of the end cap 200.
[0038] The upper end of the inner cavity of the end cap 200 is provided with a first stationary ring mounting part 201, an atmospheric end stationary ring 500 is installed at the first stationary ring mounting part 201, and a second O-ring 501 is installed between the outer wall of the atmospheric end stationary ring 500 and the first stationary ring mounting part 201 for sealing between the two.
[0039] The upper end of the bushing 100 is fitted with a first moving ring seat 110, and an atmospheric end moving ring 300 is fixedly installed on the upper end of the first moving ring seat 110. The upper end of the atmospheric end moving ring 300 abuts against the lower end of the atmospheric end stationary ring 500 to form a dynamic sealing surface of the atmospheric end.
[0040] The lower end of the inner cavity of the end cap 200 is provided with a second stationary ring mounting part 202, a medium end stationary ring 600 is installed at the second stationary ring mounting part 202, and a third O-ring 601 is installed between the upper end of the outer wall of the medium end stationary ring 600 and the first stationary ring mounting part 201 for sealing between the two.
[0041] like Figure 7-8 As shown, in this scheme, during installation, the lower end of the end cap 200 abuts against the medium end mounting part 800. At this time, the medium end stationary ring 600 also abuts against the medium end mounting part 800. The outer wall of the medium end stationary ring 600 is provided with a mounting abutment part 602. A first washer 603 is provided between the upper end of the mounting abutment part 602 and the lower end of the second stationary ring mounting part 202 to buffer the impact of the mounting abutment part 602 on the second stationary ring mounting part 202. At the same time, a fourth O-ring 604 is also provided between the lower end of the mounting abutment part 602, the lower inner wall of the second stationary ring mounting part 202, and the medium end mounting part 800 for sealing between the three, thereby preventing the medium in the medium end mounting part 800 from entering the inner cavity of the end cap 200.
[0042] The lower end of the bushing 100 is equipped with a second rotating ring seat 120, and the lower end of the second rotating ring seat 120 is equipped with a medium end rotating ring 400. The lower end of the medium end rotating ring 400 abuts against the upper end of the medium end stationary ring 600 to form a dynamic sealing surface of the medium end.
[0043] Meanwhile, a number of first compression springs 401 are provided between the ends of the medium end dynamic ring 400 and the second dynamic ring seat 120 to provide a downward thrust to the medium end dynamic ring 400, thereby providing pressure to the dynamic sealing surface formed by the medium end dynamic ring 400 and the medium end stationary ring 600.
[0044] like Figure 10As shown, the outer wall of the medium end moving ring 400 is also provided with a plurality of guide grooves 402. Correspondingly, the inner side of the second moving ring seat 120 is provided with a plurality of guide blocks 403 that cooperate with the guide grooves 402. The guide blocks 403 and the guide grooves 402 enable the medium end moving ring 400 to move up and down relative to the second moving ring seat 120, preventing the medium end moving ring 400 from rotating relative to the second moving ring seat 120.
[0045] A fifth O-ring 404 is also provided between the inner wall of the medium end dynamic ring 400 and the outer wall of the rotating shaft 900 for sealing between the medium end dynamic ring 400 and the rotating shaft 900.
[0046] Meanwhile, in this scheme, a second compression spring 405 is also provided between the second moving ring seat 120 and the first moving ring seat 110. The second compression spring 405 is used to provide an upward thrust to the first moving ring seat 110, thereby providing pressure to the dynamic sealing surface formed by the atmospheric end moving ring 300 and the atmospheric end stationary ring 500.
[0047] like Figure 10 As shown, in this scheme, a plurality of water-throwing grooves 121 are provided on the outer wall of the second moving ring seat 120, and the second moving ring seat 120 with water-throwing grooves 121 plays a role similar to the impeller in a water pump.
[0048] Meanwhile, the inner cavity of the end cap 200 has a flow guide cavity 230 at the corresponding second moving ring seat 120, and the water outlet 220 is located at the flow guide cavity 230;
[0049] It is also worth noting that, for example Figure 6 As shown, the inner wall of the flow guiding cavity 230 is eccentrically set relative to the second moving ring seat 120, and there is a gap between the inner wall of the flow guiding cavity 230 and the outer wall of the second moving ring seat 120. The α gap 231 near the lower end of the outlet 220 is the smallest. At this time, the water flow is difficult to pass quickly through the α gap 231.
[0050] When this utility is in use, cooling water enters from the upper end of the guide cavity 230 and is introduced into the water-throwing tank 101. The rotating shaft drives the second moving ring seat 120 to rotate clockwise. As the second moving ring seat 120 rotates, the water flow is driven. When the water flow passes through the α gap 231, the water flow is difficult to pass through quickly due to the reduced gap. At this time, most of the water flow is forced to be discharged from the outlet 220.
[0051] When a loop is formed between the inlet 210 and the outlet 220 by connecting an external water pipe and then to the water tank, the second moving ring seat 120 with the water-throwing groove 120 and the guide cavity 230 can work together to drive the cooling water to form a circulation.
[0052] The design incorporates a water-spraying groove 121 on the side of the second moving ring seat 120, which simplifies the structure. Furthermore, the use of the second moving ring seat 120 with the water-spraying groove 120 as the power mechanism to drive the flow of cooling water eliminates the need for an external water pump.
[0053] When this utility is in use, cooling water enters the end cover from the inlet 210. At this time, the cooling water will pass through two sets of dynamic sealing surfaces (the medium end dynamic ring and the medium end stationary ring, and the atmospheric end stationary ring and the atmospheric end dynamic ring). The cooling water will carry away the heat generated by the friction between the dynamic ring and the stationary ring, and finally flow out from the outlet 220.
[0054] 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 cartridge mechanical seal, comprising a shaft sleeve and an end cover; the shaft sleeve is fixedly fitted onto a rotating shaft; an atmospheric end rotating ring and a medium end rotating ring are respectively fixedly installed at the upper and lower ends of the shaft sleeve; the end cover is fitted onto the shaft sleeve, and an atmospheric end stationary ring and a medium end stationary ring are respectively fixedly installed at the upper and lower ends of the end cover's inner cavity; the atmospheric end rotating ring abuts against the atmospheric end stationary ring, and the medium end rotating ring abuts against the medium end stationary ring; characterized in that: The upper outer wall of the end cap is provided with a water inlet, and the lower outer wall of the end cap is provided with a water outlet. Both the water inlet and the water outlet are connected to the inner cavity of the end cap. The upper end of the bushing is fitted with a first moving ring seat, and an atmospheric moving ring is fixedly installed on the upper end of the first moving ring seat; the lower end of the bushing is fitted with a second moving ring seat, and the lower end of the second moving ring seat is fitted with a medium moving ring; the outer wall of the medium moving ring is also provided with a plurality of guide grooves, and the inner side of the second moving ring seat is provided with a plurality of guide blocks that cooperate with the guide grooves; The outer wall of the second moving ring seat is provided with several water-throwing grooves; the inner cavity of the end cap is provided with a flow guiding cavity at the corresponding second moving ring seat, and the water outlet is located at the flow guiding cavity.
2. The double-end-face cartridge mechanical seal according to claim 1, characterized in that, The upper end of the bushing has a retaining ring groove on its outer wall, and a retaining spring is fitted in the retaining ring groove; a retaining ring is also fitted on the upper end of the bushing, and the upper end of the retaining ring abuts against the retaining spring.
3. The double-end-face cartridge mechanical seal according to claim 2, characterized in that, The side wall of the fixed ring is provided with several fixed threaded holes, and the upper end of the bushing is also provided with several deformation grooves.
4. The double-end-face cartridge mechanical seal according to claim 1, characterized in that, A first O-ring is also provided between the inner wall of the lower end of the bushing and the outer wall of the shaft for sealing between the bushing and the shaft.
5. The double-end-face cartridge mechanical seal according to claim 1, characterized in that, The upper end of the inner cavity of the end cap is provided with a first stationary ring mounting part, an atmospheric stationary ring is installed at the first stationary ring mounting part, and a second O-ring is installed between the outer wall of the atmospheric stationary ring and the first stationary ring mounting part for sealing between the two.
6. The double-end-face cartridge mechanical seal according to claim 1, characterized in that, The lower end of the inner cavity of the end cap is provided with a second stationary ring mounting part, a medium end stationary ring is installed at the second stationary ring mounting part, and a third O-ring is installed between the upper end of the outer wall of the medium end stationary ring and the first stationary ring mounting part for sealing between the two.
7. The double-end-face cartridge mechanical seal according to claim 1, characterized in that, A fifth O-ring is also provided between the inner wall of the moving ring at the medium end and the outer wall of the rotating shaft.
8. The double-end-face cartridge mechanical seal according to claim 1, characterized in that, A plurality of first compression springs are also provided between the end of the medium end rotating ring and the end of the second rotating ring seat; a second compression spring is also provided between the second rotating ring seat and the first rotating ring seat.