Double-end mechanical seal with compact structure

Abstract

The double-end mechanical seal comprises a left movable ring seat, a left movable ring, a static ring part, a right movable ring and a right movable ring seat which are sequentially arranged in the axial direction, the static ring part comprises a static ring seat, a left static ring and a right static ring, a separation ring part is arranged on the inner circumference of the static ring seat and divides the static ring seat into a left matching hole and a right matching hole, and the left matching hole and the right matching hole are communicated with each other. The left static ring is sleeved and matched with the left matching hole, and the right static ring is sleeved and matched with the right matching hole; the left moving ring seat is connected with the left moving ring to form a left moving ring part, the right moving ring seat is connected with the right moving ring to form a right moving ring part, the left moving ring part and the right moving ring part are both used for being fixed to a rotating shaft, and the static ring part is used for being arranged on the rotating shaft in a sleeving mode and axially limited between the left moving ring part and the right moving ring part. The left moving ring and the left static ring abut against each other to form a left end sealing face, and the right moving ring and the right static ring abut against each other to form a right end sealing face (13). The double-end mechanical seal is beneficial to simplifying the structure and improving the structure compactness.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical seal devices, specifically a compact double-ended mechanical seal. Background Technology

[0002] Mechanical seals are widely used in the pump industry, providing a good sealing effect for the medium pumped by the pump, and are considered key components.

[0003] Existing double-ended mechanical seal structures are relatively complex and not compact enough. For example, there is a double-ended mechanical seal structure for a small engine disclosed in CN203809694U, and another example is an integrated double-ended mechanical seal disclosed in CN208457207U.

[0004] The applicant will propose a compact double-ended mechanical seal, which simplifies the structure and improves its compactness. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and propose a compact double-ended mechanical seal, which is conducive to simplifying the structure and improving the compactness of the structure.

[0006] Compared with the prior art, this utility model proposes a compact double-ended mechanical seal, including a left rotating ring seat, a left rotating ring, a stationary ring portion, a right rotating ring, and a right rotating ring seat arranged sequentially along the axial direction. The stationary ring portion includes a stationary ring seat, a left stationary ring, and a right stationary ring. The inner circumference of the stationary ring seat is provided with a dividing ring portion, which divides the stationary ring seat into a left mating hole and a right mating hole. The left stationary ring is sleeved with the left mating hole, and the right stationary ring is sleeved with the right mating hole.

[0007] The left rotating ring seat connects to the left rotating ring to form the left rotating ring part, and the right rotating ring seat connects to the right rotating ring to form the right rotating ring part. Both the left and right rotating ring parts are used to fix them on the rotating shaft. The stationary ring part is used to be fitted on the rotating shaft and is axially limited between the left and right rotating ring parts. The left rotating ring and the left stationary ring abut against each other to form the left end sealing surface, and the right rotating ring and the right stationary ring abut against each other to form the right end sealing surface.

[0008] In some embodiments, the left stationary ring is movably sleeved with the left mating hole, and a left elastic member is provided between the left side of the partition ring and the left stationary ring. When the left moving ring and the left stationary ring are mated, the left elastic member provides an elastic force that allows the left stationary ring to elastically press against the left moving ring.

[0009] In some embodiments, a left anti-rotation pin is provided between the left side of the partition ring and the left stationary ring. The left anti-rotation pin is used to restrict the left stationary ring from rotating circumferentially relative to the left mating hole.

[0010] In some embodiments, the right stationary ring is movably sleeved with the right mating hole, and a right elastic element is provided between the right side of the partition ring and the right stationary ring. When the right moving ring and the right stationary ring are mated, the right elastic element provides an elastic force that allows the right stationary ring to elastically press against the right moving ring.

[0011] In some embodiments, a right anti-rotation pin is provided between the right side of the partition ring and the right stationary ring. The right anti-rotation pin is used to restrict the right stationary ring from rotating circumferentially relative to the right mating hole.

[0012] In some embodiments, a bushing is also included, wherein the left moving ring portion and the right moving ring portion are indirectly fixed to the rotating shaft through the bushing.

[0013] In some embodiments, the left moving ring seat is integrally disposed at one end of the bushing, and the other end of the bushing is fitted and fixed to the right moving ring seat, thereby indirectly fixing both the left and right moving ring portions to the rotating shaft through the bushing.

[0014] In some embodiments, the left moving ring is fitted from the other end of the bushing and inserted into the left moving ring seat; the stationary ring portion is fitted from the other end of the bushing and abuts against the left moving ring; the right moving ring portion is fitted from the other end of the bushing and abuts against the right stationary ring of the stationary ring portion, thereby mounting the left moving ring, the stationary ring portion, the right moving ring, and the right moving ring seat on the bushing to form a cartridge-type double-ended mechanical seal.

[0015] In some embodiments, a retaining ring is provided at the other end of the bushing, which axially limits the right-side moving ring seat.

[0016] In some embodiments, the stationary ring seat has an axially extending fitting portion at one end of the left rotating ring seat. When the stationary ring portion is fitted from the other end of the bushing and the left stationary ring abuts against the left rotating ring, the left rotating ring portion and the outer peripheral wall of the left stationary ring are fitted together with the inner peripheral wall of the fitting portion to form an annular flow channel. The annular flow channel communicates with the medium. The left stationary ring has an annular back pressure surface on its back side. The annular flow channel extends to the annular back pressure surface. The medium applies pressure through the annular back pressure surface to the left stationary ring and the left rotating ring abut against each other.

[0017] Compared with the prior art, the present invention has the following advantages after adopting the above structure:

[0018] This disclosure improves the design by fitting the left and right stationary rings onto the left and right sides of the stationary ring seat to form the stationary ring portion, which is axially limited between the left and right moving ring portions. The left moving ring abuts against the left stationary ring to form the left end sealing surface, and the right moving ring abuts against the right stationary ring to form the right end sealing surface. This simplifies the structure and improves its compactness. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a compact double-ended mechanical seal disclosed herein.

[0020] Figure 2 This is a left view of a compact double-ended mechanical seal disclosed herein.

[0021] Figure 3 This is a sectional view along axis AA.

[0022] Figure 4 This is a three-dimensional schematic diagram of a stationary ring seat from one side of the bushing, according to the present disclosure.

[0023] Figure 5 This is a three-dimensional schematic diagram of a stationary ring seat from the other side of the bushing, according to the present disclosure.

[0024] Explanation of reference numerals in the attached drawings: 1-Left side moving ring seat, 2-Left moving ring, 3-Stationary ring section, 4-Right moving ring, 5-Right side moving ring seat, 6-Stationary ring seat, 7-Left stationary ring, 8-Right stationary ring, 9-Separating ring section, 10-Left mating hole, 11-Right mating hole, 12-Left end sealing surface, 13-Right end sealing surface, 14-Left elastic element, 15-Left anti-rotation pin, 16-Right elastic element, 17-Right anti-rotation pin, 18-Shaft sleeve, 19-Snap ring, 20-Annular back pressure surface, 21-Annular flow channel, 22-Suit mating part. Detailed Implementation

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0026] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0027] like Figures 1 to 5The diagram shows a compact double-ended mechanical seal that can be used for pump shaft sealing. The basic structure of this compact double-ended mechanical seal includes a left rotating ring seat 1, a left rotating ring 2, a stationary ring portion 3, a right rotating ring 4, and a right rotating ring seat 5 arranged sequentially along the axial direction. The stationary ring portion 3 includes a stationary ring seat 6, a left stationary ring 7, and a right stationary ring 8. The inner circumference of the stationary ring seat 6 is provided with a dividing ring portion 9, which divides the stationary ring seat 6 into a left mating hole 10 and a right mating hole 11. The left stationary ring 7 is fitted with the left mating hole 10, and the right stationary ring 8 is fitted with the right mating hole 11.

[0028] The left rotating ring seat 1 connects to the left rotating ring 2 to form the left rotating ring part, and the right rotating ring seat 5 connects to the right rotating ring 4 to form the right rotating ring part. Both the left and right rotating ring parts are used to fix them on the rotating shaft. The stationary ring part 3 is used to be fitted on the rotating shaft and is axially limited between the left and right rotating ring parts. The left rotating ring 2 and the left stationary ring 7 abut against each other to form the left end sealing surface 12, and the right rotating ring 4 and the right stationary ring 8 abut against each other to form the right end sealing surface 13.

[0029] In this example, the compact double-ended mechanical seal is designed as a cartridge double-ended mechanical seal. Specifically, it also includes a bushing 18, and the left and right moving ring parts are indirectly fixed to the rotating shaft through the bushing 18.

[0030] Furthermore, such as Figure 3 As shown, the left moving ring seat 1 is integrally set at one end of the bushing 18, and the other end of the bushing 18 is fitted and fixed to the right moving ring seat 5. The right moving ring seat 5 is fixed to the bushing 18 by fasteners, thereby indirectly fixing both the left and right moving ring parts to the rotating shaft through the bushing 18.

[0031] Furthermore, such as Figure 3 As shown, the left moving ring 2 is fitted from the other end of the bushing 18 and is inserted into the left moving ring seat 1. The stationary ring part 3 is fitted from the other end of the bushing 18 and the left stationary ring 7 abuts against the left moving ring 2. The right moving ring part is fitted from the other end of the bushing 18 and the right moving ring 4 abuts against the right stationary ring 8 of the stationary ring part 3. Thus, the left moving ring 2, the stationary ring part 3, the right moving ring 4, and the right moving ring seat 5 are all installed on the bushing 18 to form a cartridge-type double-ended mechanical seal. In this way, the cartridge-type mechanical seal can be assembled by itself first, and then the whole thing is fitted onto the rotating shaft through the bushing 18. This not only facilitates assembly and reduces the assembly difficulty for on-site assembly workers, but also ensures high assembly accuracy.

[0032] Furthermore, such as Figure 3 As shown, a retaining ring 19 is also provided at the other end of the bushing 18. In this way, on the one hand, during assembly, the retaining ring 19 can be used to temporarily limit the axial movement of the right moving ring seat 5, and then the right moving ring seat 5 can be fixed to the bushing 18 with screws, which facilitates assembly. On the other hand, it is beneficial for the right moving ring seat 5 to reliably limit the axial movement of the right stationary ring 8.

[0033] In some embodiments, such as Figure 3 As shown, the bushing 18 is generally T-shaped, and the left moving ring seat 1 is the horizontal part of the T-shape. In order to reliably and with high precision install the left moving ring 2, the left moving ring seat 1 is provided with an annular groove around one end of one side of the bushing 18. The left moving ring 2 is inserted into the bushing 18 from the other end and engages with the annular groove. In this way, after the left moving ring 2 is installed on the left moving ring seat 1 of the bushing 18, the bushing 18 serves as the installation reference, providing a basis for the subsequent high-precision assembly of the stationary ring part 3.

[0034] In some embodiments, such as Figure 3 , 4 As shown, the left stationary ring 7 is movably fitted with the left mating hole 10. A left elastic element 14 is provided between the left side of the separating ring 9 and the left stationary ring 7. When the left moving ring 2 and the left stationary ring 7 are mated, the left elastic element 14 provides an elastic force for the left stationary ring 7 to elastically press against the left moving ring 2. In this way, the left stationary ring 7 has axial movement capability, thereby adaptively pressing against the left moving ring 2 to form a more reliable left end sealing surface 12.

[0035] Furthermore, a left anti-rotation pin 15 is provided between the left side of the partition ring 9 and the left stationary ring 7. The left anti-rotation pin 15 is used to restrict the left stationary ring 7 from rotating circumferentially relative to the left mating hole 10.

[0036] In some embodiments, such as Figure 3 , 4 As shown, the right stationary ring 8 is movably fitted with the right mating hole 11. A right elastic element 16 is provided between the right side of the separating ring 9 and the right stationary ring 8. When the right moving ring 4 and the right stationary ring 8 are mated, the right elastic element 16 provides an elastic force for the right stationary ring 8 to elastically press against the right moving ring 4. In this way, the right stationary ring 8 also has axial movement capability, thereby adaptively pressing against the right moving ring 4 to form a more reliable right end sealing surface 13.

[0037] Furthermore, a right anti-rotation pin 17 is provided between the right side of the partition ring 9 and the right stationary ring 8. The right anti-rotation pin 17 is used to restrict the right stationary ring 8 from rotating circumferentially relative to the right mating hole 11.

[0038] In some embodiments, such as Figure 3 As shown, the stationary ring seat 6 has an axially extending fitting part 22 at one end of the left moving ring seat 1, such as... Figure 3 As shown, it is flared. When the stationary ring part 3 is fitted from the other end of the bushing 18 and the left stationary ring 7 abuts against the left moving ring 2, the outer peripheral wall of the left moving ring part and the left stationary ring 7 and the inner peripheral wall of the fitting part 22 are fitted together to form an annular flow channel 21. In this way, a high-precision annular flow channel 21 is formed very conveniently, which provides great convenience for controlling the gap between the outer peripheral wall and the inner peripheral wall of the annular flow channel 21 of the mechanical seal.

[0039] Furthermore, the annular flow channel 21 connects to the medium, and the left stationary ring 7 has an annular back pressure surface 20 on its back side. The annular flow channel 21 extends to the annular back pressure surface 20. In other words, the medium being transported can flow into the annular back pressure surface 20 through the annular flow channel 21. Consequently, due to the pressure of the medium, the medium exerts pressure on the left stationary ring 7 through the annular back pressure surface 20, causing it to abut against the left moving ring 2. Thus, because the medium exerts pressure on the left stationary ring 7 through the annular back pressure surface 20, causing it to abut against the left moving ring 2, the critical left end sealing surface 12 can form a more reliable dynamic sealing fit during rotational operation, reducing the risk of medium leakage during long-term operation.

[0040] When understanding this disclosure, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that's understood, so I won't go into details here.

[0041] The above description is merely an illustrative embodiment of this utility model. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of this utility model are included within the scope of protection of this utility model.

Claims

1. A compact double-ended mechanical seal, characterized in that, The device includes a left moving ring seat (1), a left moving ring (2), a stationary ring part (3), a right moving ring (4), and a right moving ring seat (5) arranged sequentially along the axial direction. The stationary ring part (3) includes a stationary ring seat (6), a left stationary ring (7), and a right stationary ring (8). The inner circumference of the stationary ring seat (6) is provided with a dividing ring part (9), which divides the stationary ring seat (6) into a left mating hole (10) and a right mating hole (11). The left stationary ring (7) is fitted with the left mating hole (10), and the right stationary ring (8) is fitted with the right mating hole (11). The left moving ring seat (1) connects to the left moving ring (2) to form the left moving ring part, and the right moving ring seat (5) connects to the right moving ring (4) to form the right moving ring part. The left moving ring part and the right moving ring part are both used to fix on the rotating shaft. The stationary ring part (3) is used to be fitted on the rotating shaft and is axially limited between the left moving ring part and the right moving ring part. The left moving ring (2) and the left stationary ring (7) abut against each other to form the left end sealing surface (12), and the right moving ring (4) and the right stationary ring (8) abut against each other to form the right end sealing surface (13).

2. The compact double-ended mechanical seal as described in claim 1, characterized in that, The left stationary ring (7) is movably fitted with the left mating hole (10). A left elastic element (14) is provided between the left side of the partition ring (9) and the left stationary ring (7). When the left moving ring (2) and the left stationary ring (7) are mated, the left elastic element (14) provides the elastic force for the left stationary ring (7) to elastically press against the left moving ring (2).

3. The compact double-ended mechanical seal as described in claim 2, characterized in that, A left anti-rotation pin (15) is also provided between the left side of the partition ring (9) and the left stationary ring (7). The left anti-rotation pin (15) is used to restrict the left stationary ring (7) from rotating circumferentially relative to the left mating hole (10).

4. The compact double-ended mechanical seal as described in claim 1, characterized in that, The right stationary ring (8) is movably fitted with the right mating hole (11). A right elastic element (16) is provided between the right side of the partition ring (9) and the right stationary ring (8). When the right moving ring (4) and the right stationary ring (8) are mated, the right elastic element (16) provides the right stationary ring (8) with elastic force that elastically presses against the right moving ring (4).

5. The compact double-ended mechanical seal as described in claim 4, characterized in that, A right anti-rotation pin (17) is also provided between the right side of the partition ring (9) and the right stationary ring (8). The right anti-rotation pin (17) is used to restrict the right stationary ring (8) from rotating circumferentially relative to the right mating hole (11).

6. The compact double-ended mechanical seal as described in claim 1, characterized in that, It also includes a bushing (18), and the left moving ring part and the right moving ring part are indirectly fixed to the rotating shaft through the bushing (18).

7. The compact double-ended mechanical seal as described in claim 6, characterized in that, The left moving ring seat (1) is integrally set at one end of the bushing (18), and the other end of the bushing (18) is fitted and fixed to the right moving ring seat (5), so that the left moving ring part and the right moving ring part are indirectly fixed to the rotating shaft through the bushing (18).

8. The compact double-ended mechanical seal as described in claim 7, characterized in that, The left moving ring (2) is fitted from the other end of the bushing (18) and inserted into the left moving ring seat (1). The stationary ring part (3) is fitted from the other end of the bushing (18) and the left stationary ring (7) abuts against the left moving ring (2). The right moving ring part is fitted from the other end of the bushing (18) and the right moving ring (4) abuts against the right stationary ring (8) of the stationary ring part (3). Thus, the left moving ring (2), the stationary ring part (3), the right moving ring (4), and the right moving ring seat (5) are all installed on the bushing (18) to form a cartridge-type double-ended mechanical seal.

9. The compact double-ended mechanical seal as described in claim 8, characterized in that, A retaining ring (19) is provided at the other end of the bushing (18), which axially limits the right-side moving ring seat (5).

10. The compact double-ended mechanical seal as described in claim 8, characterized in that, The stationary ring seat (6) has an axially extending fitting part (22) at one end of the left moving ring seat (1). When the stationary ring part (3) is fitted from the other end of the bushing (18) and the left stationary ring (7) abuts against the left moving ring (2), the outer peripheral wall of the left moving ring part and the left stationary ring (7) and the inner peripheral wall of the fitting part (22) are fitted together to form an annular flow channel (21). The annular flow channel (21) communicates with the medium. The left stationary ring (7) has an annular back pressure surface (20) on the back side. The annular flow channel (21) extends to the annular back pressure surface (20). The medium applies pressure to the left stationary ring (7) and the left moving ring (2) through the annular back pressure surface (20) to abut against each other.

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