A dynamic ring positioning structure and a mechanical seal

Abstract

This utility model discloses a dynamic ring positioning structure and a mechanical seal, including a bushing; an external dynamic ring seat is fixedly sleeved on the middle section of the bushing, and an external dynamic ring mounting cavity for installing the external dynamic ring is opened on the top of the external dynamic ring seat; an external driving ring is also provided inside the external dynamic ring mounting cavity to prevent relative rotation between the external dynamic ring seat, the bushing, and the external dynamic ring; two first positioning blocks are symmetrically arranged on the top of the external driving ring; this utility model prevents relative rotation between the external dynamic ring, the bushing, and the external dynamic ring seat by using the first positioning blocks on the external driving ring, the bushing positioning part, and the third positioning groove, and achieves the positioning requirements between the three components with a single part, reducing the number of parts.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seals, specifically a dynamic ring positioning structure and a mechanical seal. Background Technology

[0002] A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reactors, and compressors. Because the drive shaft runs through both the inside and outside of the equipment, a circumferential gap exists between the shaft and the equipment. The medium inside the equipment leaks outward through this gap. If the pressure inside the equipment is lower than atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is necessary to prevent leakage.

[0003] For example, patent CN223152772U discloses a mechanical seal device for a high-temperature melt pump, including a bushing, an O-ring on the inner side of the bushing, a retaining ring on the outer side of the bushing, a retaining ring screw inside the retaining ring, a moving ring seat on the outer side of the bushing, a drive set screw inside the moving ring seat, a manifold on the outer side of the moving ring seat, a manifold screw inside the manifold, a manifold screw inside the moving ring seat, an O-ring on the inner side of the moving ring seat, and a moving ring O-ring on the outer side of the moving ring seat.

[0004] The aforementioned patent effectively isolates the high-temperature melt from the inner seal by setting a pre-seal on the outside of the sealing ring, preventing the medium from entering the sealing end face. The pumping spiral is machined by the bushing and the sealing box to effectively lubricate and cool the inner and outer sealing end faces. However, the disadvantage of the aforementioned patent is that in existing mechanical seals, a locating pin is usually required between the rotating ring and the rotating ring seat to prevent rotation between them. However, the use of locating pins is not suitable for some more complex chassis seals.

[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 dynamic ring positioning structure and a 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 dynamic ring positioning structure includes a bushing; an external dynamic ring seat is fixedly sleeved on the middle section of the bushing, and an external dynamic ring mounting cavity for mounting the external dynamic ring is opened at the top of the external dynamic ring seat; an external driving ring is also provided inside the external dynamic ring mounting cavity to prevent relative rotation between the external dynamic ring seat, the bushing and the external dynamic ring.

[0009] The top of the external drive ring is symmetrically provided with two first positioning blocks, and the bottom of the external moving ring is provided with two first positioning grooves. The first positioning blocks are located in the first positioning grooves to prevent the external drive ring from rotating relative to the external moving ring.

[0010] One of the positioning blocks at the top of the external drive ring extends inward and is provided with a bushing positioning part; a bushing positioning groove is provided on the side wall of the bushing to accommodate the bushing positioning part; the bushing positioning part is located in the bushing positioning groove, thereby preventing the external drive ring from rotating relative to the bushing.

[0011] The external drive ring has a third positioning groove recessed inward at the position of another positioning block. At the same time, the bottom inner side of the moving ring mounting cavity of the external moving ring seat has a third positioning part extending inward. The third positioning part is located in the third positioning groove, thereby preventing the external drive ring from rotating relative to the external moving ring seat.

[0012] Furthermore, a first shoulder is integrally formed on the middle section of the bushing, and the top of the first shoulder abuts against the bottom of the external moving ring seat; the bottom of the external moving ring mounting cavity abuts against a first retaining spring, and the first retaining spring is engaged in the first retaining spring groove on the bushing.

[0013] A mechanical seal further includes:

[0014] An external moving ring and an internal moving ring are fixedly installed in the middle section and at the lower end of the bushing, respectively. The pressure cap is sleeved on the outer ring of the bushing. An external stationary ring is installed at the upper end of the pressure cap, a pressure cap bushing ring is installed at the lower end of the pressure cap, and an internal stationary ring is installed at the lower end of the pressure cap bushing ring. The external moving ring and the external stationary ring abut against each other to form a set of end face friction pairs, and the internal moving ring and the internal stationary ring abut against each other to form another set of end face friction pairs. Water inlet channels and water outlet channels are respectively provided on the left and right sides of the pressure cap, and a flow guide sleeve is also fixedly installed on the inner side of the pressure cap. The internal channel of the water inlet channel extends to the outside of the flow guide sleeve, while the internal channel of the water outlet channel extends to the inside of the flow guide sleeve.

[0015] Furthermore, the top of the inner cavity of the pressure cap is provided with an outer stationary ring mounting cavity for installing an outer stationary ring. An outer stationary ring is installed at the lower end of the outer stationary ring mounting cavity, and an outer spring seat is provided between the outer stationary ring and the top of the outer stationary ring mounting cavity. Several first springs are provided between the outer spring seat and the top of the outer stationary ring mounting cavity. An outer positioning pin is also provided between the outer stationary ring and the outer stationary ring mounting cavity to prevent rotation between the two.

[0016] Furthermore, the bottom of the bushing is integrally formed with a built-in rotating ring seat, and the top of the built-in rotating ring seat is provided with a built-in rotating ring mounting groove for installing the built-in rotating ring; a built-in positioning pin is fixedly installed at the bottom of the built-in rotating ring mounting groove, and a fifth positioning groove is provided at the bottom of the built-in rotating ring, with the built-in positioning pin located in the fifth positioning groove to prevent rotation between the built-in rotating ring seat and the built-in rotating ring.

[0017] Furthermore, the side wall of the gland liner is provided with a gland abutment ring, the top of which abuts against the edge of the lower opening of the gland, and a fifth O-ring is provided between the top of the side wall of the gland liner and the inner wall of the lower opening of the gland for sealing between the two.

[0018] Furthermore, a built-in stationary ring is installed at the lower end of the pressure cap liner, and a built-in spring seat is installed at the upper end of the pressure cap liner. The bottom of the built-in spring seat abuts against the top of the built-in stationary ring. Two sixth positioning blocks are provided downwardly at the bottom of the built-in spring seat, and two sixth positioning grooves are provided at the top of the built-in stationary ring. The sixth positioning blocks are located in the sixth positioning grooves to prevent rotation between the built-in spring seat and the built-in stationary ring. At least two recessed seventh positioning grooves are provided on the side wall of the built-in spring seat, and two protruding seventh positioning blocks are provided on the inner wall of the pressure cap liner.

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

[0020] The first positioning block, bushing positioning part and third positioning groove on the external drive ring prevent relative rotation between the external moving ring, bushing and external moving ring seat. The positioning requirements between the three components are achieved by using one part (external drive ring), reducing the number of parts. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a mechanical seal.

[0022] Figure 2 This is a front view of the mechanical seal.

[0023] Figure 3 This is a side view of the mechanical seal.

[0024] Figure 4 This is a top view of the mechanical seal.

[0025] Figure 5 for Figure 2 Sectional view along the AA direction.

[0026] Figure 6 for Figure 5 A magnified view of a portion of point a.

[0027] Figure 7 for Figure 5 A magnified view of a section at point b.

[0028] Figure 8 for Figure 5 A magnified view of a section at point c.

[0029] Figure 9 for Figure 3 Sectional view along the BB direction.

[0030] Figure 10 for Figure 9 A magnified view of a portion at point d.

[0031] Figure 11 This is an exploded view of the dynamic ring positioning structure.

[0032] Figure 12 This is a schematic diagram of the external drive ring.

[0033] Figure 13 This is a schematic diagram of the external moving ring seat.

[0034] Figure 14 This is a schematic diagram of the mechanical seal installation process. Detailed Implementation

[0035] 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.

[0036] Please see Figure 1-14 A mechanical seal includes a bushing 1; in use, the bushing 1 is fixedly mounted on a rotating shaft 900.

[0037] An external rotating ring 300 and an internal rotating ring 400 are fixedly installed in the middle section and at the lower end of the bushing 100, respectively. The pressure cap 200 is sleeved on the outer ring of the bushing 100. An external stationary ring 500 is installed at the upper end of the pressure cap 200, and a pressure cap bushing 210 is installed at the lower end of the pressure cap bushing 210. An internal stationary ring 600 is installed at the lower end of the pressure cap bushing 210. The external rotating ring 300 and the external stationary ring 500 abut against each other to form a set of end face friction pairs. The internal rotating ring 400 and the internal stationary ring 600 abut against each other to form another set of end face friction pairs.

[0038] The pressure cap 200 has an inlet channel 201 and an outlet channel 202 respectively on its left and right sides. A guide sleeve 203 is also fixedly installed on the inner side of the pressure cap 200. It is worth noting that the inner channel of the inlet channel 201 extends to the outer side of the guide sleeve 203, while the inner channel of the outlet channel 202 extends to the inner side of the guide sleeve 203.

[0039] like Figure 9-13 In this solution, an external moving ring seat 301 is fixedly sleeved on the middle section of the bushing 100, and an external moving ring mounting cavity 302 for installing the external moving ring 300 is opened on the top of the external moving ring seat 301.

[0040] Specifically, a first shoulder 303 is integrally formed on the middle section of the bushing 100. The top of the first shoulder 303 abuts against the bottom of the external moving ring seat 301, thereby preventing the external moving ring seat 301 from moving downward relative to the bushing 100. The bottom of the external moving ring mounting cavity 302 abuts against a first retaining spring 304, which engages with a first retaining spring groove 305 on the bushing 100, thereby preventing the external moving ring seat 301 from moving upward relative to the bushing 100.

[0041] The moving ring mounting cavity 302 is also provided with an external driving ring 306 to prevent relative rotation between the external moving ring seat 301, the bushing 100 and the external moving ring 300;

[0042] like Figure 12 As shown, specifically, the top of the external drive ring 306 is symmetrically provided with two first positioning blocks 307, and the bottom of the external moving ring 300 is provided with two first positioning grooves 308. The first positioning blocks 307 are located in the first positioning grooves 308, thereby preventing the external drive ring 306 from rotating relative to the external moving ring 300.

[0043] One of the positioning blocks 307 at the top of the external drive ring 306 extends inward and is provided with a bushing positioning part 312; a bushing positioning groove 309 is provided on the side wall of the bushing 100 to accommodate the bushing positioning part 312; the bushing positioning part 312 is located in the bushing positioning groove 309, thereby preventing the external drive ring 306 from rotating relative to the bushing 100.

[0044] The external drive ring 306 is recessed inward at the position of another positioning block 307 and a third positioning groove 310 is provided. At the same time, the bottom inner side of the moving ring mounting cavity 302 of the external moving ring seat 301 is provided with a third positioning part 311. The third positioning part 311 is located in the third positioning groove 310, thereby preventing the external drive ring 306 from rotating relative to the external moving ring seat 301.

[0045] In summary, the first positioning block 307, the bushing positioning part 312, and the third positioning groove 310 on the external drive ring 306 prevent relative rotation between the external moving ring 300, the bushing 100, and the external moving ring seat 301. The positioning requirements between the three components are achieved by using a single part (external drive ring 306), thus reducing the number of parts.

[0046] In this design, a first O-ring 314 is provided between the external moving ring seat 301 and the bushing 100 for sealing between them. Similarly, a second O-ring 313 is provided between the inner wall of the moving ring mounting cavity 302 and the external moving ring 300 for sealing between them.

[0047] like Figure 6 As shown, the top of the inner cavity of the pressure cap 200 is provided with an outer stationary ring mounting cavity 501 for mounting an outer stationary ring 500. The outer stationary ring 500 is mounted at the lower end of the outer stationary ring mounting cavity 501. An outer spring seat 502 is also provided between the outer stationary ring 500 and the top of the outer stationary ring mounting cavity 501. Several first springs 503 are provided between the outer spring seat 502 and the top of the outer stationary ring mounting cavity 501 to provide downward preload to the outer stationary ring 500, so that the outer stationary ring 500 presses against the outer moving ring 300. At the same time, in this solution, an outer positioning pin 504 is also provided between the outer stationary ring 500 and the outer stationary ring mounting cavity 501 to prevent rotation between the two.

[0048] Specifically, the external positioning pin 504 is fixedly inserted into the top of the external stationary ring mounting cavity 501, and the sides of the external spring seat 502 and the external stationary ring 500 are both provided with a fourth positioning groove 505 for accommodating the external positioning pin 504. The external positioning pin 504 is located in the fourth positioning groove 505, thereby preventing rotation between the external spring seat 502, the external stationary ring 500 and the pressure cover 200.

[0049] In this solution, the top of the external stationary ring mounting cavity 501 is also provided with a first spring mounting hole 506 for accommodating the first spring 503. The first spring 503 is installed in the first spring mounting hole 506, and the lower end of the first spring 503 abuts against the top of the external spring seat 502.

[0050] In this design, a third O-ring 507 is provided between the inner wall of the external stationary ring mounting cavity 501 and the external stationary ring 500 for sealing between the two.

[0051] like Figure 5 As shown, the bottom of the bushing 100 is integrally formed with a built-in rotating ring seat 401, and the top of the built-in rotating ring seat 401 is provided with a built-in rotating ring mounting groove 402 for mounting the built-in rotating ring 400; a built-in positioning pin 403 is fixedly installed at the bottom of the built-in rotating ring mounting groove 402, and a fifth positioning groove 404 is provided at the bottom of the built-in rotating ring 400. The built-in positioning pin 403 is located in the fifth positioning groove 404 to prevent rotation between the built-in rotating ring seat 401 and the built-in rotating ring 400.

[0052] In this design, a fourth O-ring 405 is provided between the inner wall of the built-in moving ring mounting groove 402 and the built-in moving ring 400 for sealing between the two.

[0053] like Figure 7 As shown, the side wall of the gland liner 210 is provided with a gland abutment ring 211, the top of the gland abutment ring 211 abuts against the edge of the lower opening of the gland 200, and a fifth O-ring 212 is provided between the top of the side wall of the gland liner 210 and the inner wall of the lower opening of the gland 200 for sealing between the two.

[0054] like Figure 8 As shown, a built-in stationary ring 600 is installed at the lower end of the pressure cap liner 210, and a built-in spring seat 601 is installed at the upper end of the pressure cap liner 210. The bottom of the built-in spring seat 601 abuts against the top of the built-in stationary ring 600.

[0055] The bottom of the built-in spring seat 601 extends downward and is provided with two sixth positioning blocks 602. The top of the built-in stationary ring 600 is provided with two sixth positioning grooves 603. The sixth positioning blocks 602 are located in the sixth positioning grooves 603 to prevent rotation between the built-in spring seat 601 and the built-in stationary ring 600.

[0056] Meanwhile, in this solution, at least two recessed seventh positioning grooves 604 are provided on the side wall of the built-in spring seat 601, and two protruding seventh positioning blocks 605 are provided on the inner wall of the pressure cover ring 210; the seventh positioning blocks 605 are located in the seventh positioning grooves 604 to prevent rotation between the built-in spring seat 601 and the pressure cover ring 210.

[0057] The top of the built-in spring seat 601 is provided with a second spring mounting hole 607 for mounting the second spring 606. The second spring 606 is installed in the second spring mounting hole 607, and the top of the second spring 606 abuts against the bottom of the outer side of the guide sleeve 203. The second spring 606 provides a pre-pressure for the external stationary ring 500 to press down, so that the built-in stationary ring 600 presses against the built-in moving ring 400.

[0058] In this design, a sixth O-ring 608 is provided between the inner wall of the gland liner 210 and the built-in stationary ring 600 for sealing between the two.

[0059] When installing this utility model, if Figure 14 As shown, the entire mechanical seal is fixedly installed on the mounting part 800 by the gland 200; at this time, the gland liner 210 is tightly attached to the surface of the mounting part 800, and a gasket 801 is also provided between the gland liner 210 and the surface of the mounting part 800 for buffering and sealing between the two.

[0060] The pressure cap 200 is fixed to the surface of the mounting part 800 by screws (not shown in the figure), and the pressure cap 200 presses against the pressure cap bushing 210. The pressure cap 200 has a U-shaped opening groove for installing screws;

[0061] When this utility is in use, cooling water enters the mechanical seal from the inlet channel 201. The cooling water flows through the outer side of the guide sleeve 203 to the inner dynamic ring 400 and the inner stationary ring 600, and then flows through the inner side of the guide sleeve 203 to the outlet channel 202. The cooling water will carry away the heat generated by the friction between the dynamic ring and the stationary ring, and finally flows out from the outlet channel 202.

[0062] 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 dynamic ring positioning structure comprising a shaft sleeve, characterized in that: An external moving ring seat is fixedly sleeved on the middle section of the bushing, and an external moving ring mounting cavity for installing the external moving ring is opened at the top of the external moving ring seat; an external driving ring is also provided inside the external moving ring mounting cavity to prevent relative rotation between the external moving ring seat, the bushing and the external moving ring. The top of the external drive ring is symmetrically provided with two first positioning blocks, and the bottom of the external moving ring is provided with two first positioning grooves. The first positioning blocks are located in the first positioning grooves to prevent the external drive ring from rotating relative to the external moving ring. One of the positioning blocks at the top of the external drive ring extends inward and is provided with a bushing positioning part; a bushing positioning groove is provided on the side wall of the bushing to accommodate the bushing positioning part; the bushing positioning part is located in the bushing positioning groove, thereby preventing the external drive ring from rotating relative to the bushing. The external drive ring has a third positioning groove recessed inward at the position of another positioning block. At the same time, the bottom inner side of the moving ring mounting cavity of the external moving ring seat has a third positioning part extending inward. The third positioning part is located in the third positioning groove, thereby preventing the external drive ring from rotating relative to the external moving ring seat.

2. The dynamic ring positioning structure according to claim 1, characterized in that, The middle section of the bushing has an integrally formed first shoulder, the top of which abuts against the bottom of the external moving ring seat; the bottom of the external moving ring mounting cavity abuts against a first retaining spring, which is engaged in a first retaining spring groove on the bushing.

3. A mechanical seal, characterized in that: Including the dynamic ring positioning structure as described in any one of claims 1-2, it further includes: An external moving ring and an internal moving ring are fixedly installed in the middle section and at the lower end of the bushing, respectively. A pressure cap is fitted around the outer ring of the bushing. An external stationary ring is installed at the upper end of the pressure cap, a pressure cap bushing ring is installed at the lower end of the pressure cap, and an internal stationary ring is installed at the lower end of the pressure cap bushing ring. The external moving ring and the external stationary ring abut against each other to form a set of end-face friction pairs, and the internal moving ring and the internal stationary ring abut against each other to form another set of end-face friction pairs. Water inlet channels and water outlet channels are respectively provided on the left and right sides of the pressure cap, and a flow guide sleeve is fixedly installed on the inner side of the pressure cap. The internal channel of the water inlet channel extends to the outside of the flow guide sleeve, while the internal channel of the water outlet channel extends to the inside of the flow guide sleeve.

4. A mechanical seal according to claim 3, characterized in that, The top of the inner cavity of the pressure cap is provided with an outer stationary ring mounting cavity for installing an outer stationary ring. An outer stationary ring is installed at the lower end of the outer stationary ring mounting cavity, and an outer spring seat is provided between the outer stationary ring and the top of the outer stationary ring mounting cavity. Several first springs are provided between the outer spring seat and the top of the outer stationary ring mounting cavity. An outer positioning pin is also provided between the outer stationary ring and the outer stationary ring mounting cavity to prevent rotation between the two.

5. A mechanical seal according to claim 3, characterized in that, The bottom of the bushing is integrally formed with a built-in rotating ring seat, and the top of the built-in rotating ring seat is provided with a built-in rotating ring mounting groove for installing the built-in rotating ring; a built-in positioning pin is fixedly installed at the bottom of the built-in rotating ring mounting groove, and a fifth positioning groove is provided at the bottom of the built-in rotating ring, with the built-in positioning pin located in the fifth positioning groove to prevent rotation between the built-in rotating ring seat and the built-in rotating ring.

6. A mechanical seal according to claim 3, characterized in that, The side wall of the gland liner is provided with a gland abutment ring, the top of which abuts against the edge of the lower opening of the gland. At the same time, a fifth O-ring is provided between the top of the side wall of the gland liner and the inner wall of the lower opening of the gland for sealing between the two.

7. A mechanical seal according to claim 3, characterized in that, The lower end of the pressure cap liner is equipped with an internal stationary ring, and the upper end of the pressure cap liner is equipped with an internal spring seat. The bottom of the internal spring seat abuts against the top of the internal stationary ring. Two sixth positioning blocks are provided downward from the bottom of the internal spring seat, and two sixth positioning grooves are provided on the top of the internal stationary ring. The sixth positioning blocks are located in the sixth positioning grooves to prevent rotation between the internal spring seat and the internal stationary ring. At least two recessed seventh positioning grooves are provided on the side wall of the internal spring seat, and two protruding seventh positioning blocks are provided on the inner wall of the pressure cap liner.

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