Container type single-end mechanical seal

Abstract

The packaging type single-end mechanical seal comprises a movable ring seat, a movable ring, a static ring seat, a static ring and a shaft sleeve, the movable ring seat is integrally arranged at one end of the shaft sleeve, the movable ring is installed on the movable ring seat to form a movable ring part, the static ring and the static ring seat are installed in a sleeved mode from the other end of the shaft sleeve, and an annular matching groove is formed in the other end of the shaft sleeve. An axial limiting piece is installed between the static ring base and the shaft sleeve, after the static ring base is sleeved with the shaft sleeve from the other end of the shaft sleeve, the axial limiting piece is inserted into the annular matching groove in a matched mode, and due to insertion matching, on one hand, the axial limiting piece can rotate along the annular matching groove or rotate along with the shaft sleeve when the shaft sleeve rotates; the axial limiting piece enables the static ring seat to be axially limited relative to the shaft sleeve, so that the movable ring and the static ring are axially abutted and matched to form a sealing end face, and meanwhile, the movable ring, the static ring seat and the static ring are axially mounted on the shaft sleeve to form a cartridge type single-end mechanical seal; the packaging type single-end mechanical seal is high in precision and beneficial to assembly simplification.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical sealing devices, in particular to a container-type single-end mechanical seal. Background Art

[0002] Existing mechanical seals generally include a stationary ring seat, a stationary ring, a dynamic ring seat, and a dynamic ring. The dynamic ring is installed on the rotating shaft and rotates with the rotating shaft. The dynamic ring and the stationary ring abut against each other to form a dynamic sealing surface, thereby meeting the sealing requirements of the pump. For example, a mechanical seal disclosed in publication number CN108278368A, and another example is a mechanical seal disclosed in CN114776808A. In addition, there is also a container-type mechanical seal, such as the container-type mechanical seal disclosed in announcement number CN101985947B.

[0003] However, existing mechanical seals are mostly designed for double-end mechanical seals, and are more complicated to install and have low precision, which increases the difficulty of assembly for on-site operators. The applicant will propose a containerized single-end mechanical seal with high precision, which is conducive to simplifying assembly. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a container-type single-end mechanical seal with high precision and conducive to simplified assembly.

[0005] Compared with the prior art, the present invention proposes a container-type single-end mechanical seal, comprising a dynamic ring seat, a dynamic ring, a stationary ring seat, and a stationary ring, and also comprises a sleeve for sealing and fixing on a rotating shaft, wherein the sleeve has an integral dynamic ring seat at one end, the dynamic ring seat is installed with the dynamic ring to form a dynamic ring part, and the stationary ring and the stationary ring seat are installed from the other end of the sleeve, and an annular matching groove is provided at the other end of the sleeve, and an axial limit piece is installed between the stationary ring seat and the sleeve, and when the stationary ring seat is inserted from the other end of the sleeve, the axial limit piece is inserted and matched in the annular matching groove, and the insertion and matching enables the axial limit piece to rotate along the annular matching groove or rotate with the sleeve when the sleeve rotates, and on the other hand, the axial limit piece enables the stationary ring seat to be axially limited relative to the sleeve, so that the dynamic ring and the stationary ring are axially abutted and matched to form a sealing end face, and at the same time, the dynamic ring, the stationary ring seat, and the stationary ring are all axially installed on the sleeve to form a container-type single-end mechanical seal.

[0006] In some embodiments, the outer circumferential wall of the dynamic ring portion is sleeved with the inner circumferential wall of the stationary ring seat at one end of the sleeve to form a connecting flow channel, which connects the medium. The stationary ring is provided with a force-bearing back side or is not provided with a force-bearing back side. When a force-bearing back side is provided, the connecting flow channel extends toward the stationary ring side at least to the force-bearing back side, and the medium applies pressure to the stationary ring through the force-bearing back side to cause the stationary ring to be abutted against the dynamic ring.

[0007] In some embodiments, the axial limit member is a vertical plug plate or an L-shaped plug plate, and the vertical plug plate is radially inserted along the end face of this end of the stationary ring seat and fits in the annular fitting groove, while the transverse portion of the L-shaped plug plate is fixedly matched with the outer peripheral wall of this end of the stationary ring seat at the annular fitting groove, and the vertical portion of the L-shaped plug plate is radially inserted along the end face of this end of the stationary ring seat and fits in the annular fitting groove.

[0008] In some embodiments, the end surface of the insertion portion of the vertical portion is configured as an arc surface that matches the bottom surface of the annular matching groove.

[0009] In some embodiments, a gap is set between the arc surface and the bottom surface of the annular matching groove.

[0010] In some embodiments, the transverse portion is fixed to the outer peripheral wall by fasteners.

[0011] In some embodiments, the stationary ring seat is provided with a sleeve hole with the inner peripheral ring portion as the bottom, the stationary ring is inserted into and sleeved with the sleeve hole, and the inner peripheral ring portion limits the axial position of the stationary ring.

[0012] In some embodiments, the stationary ring is movably fitted into the sleeve hole, and an elastic member and an anti-rotation pin are provided between the stationary ring and the inner ring portion. The elastic member elastically presses the stationary ring against the dynamic ring to form a sealing end face, and the anti-rotation pin is used to prevent the stationary ring from moving in the circumferential direction.

[0013] In some embodiments, the sleeve is set to be T-shaped, the dynamic ring seat is the lateral part of the T-shape, the dynamic ring seat is provided with an annular groove around one end of the sleeve, and the dynamic ring is inserted into the other end of the sleeve and fits into the annular groove.

[0014] In some embodiments, a plurality of axial limit members are provided and are circumferentially spaced and distributed along the annular matching groove.

[0015] After adopting the above structure, compared with the prior art, the present invention has the following advantages: The present invention discloses an improvement in which an integrated dynamic ring seat is specially arranged at one end of the shaft sleeve. For example, a high-precision shaft sleeve and an integrated dynamic ring seat are obtained by machining a casting, a steel billet, etc. The casting and machining are both conventional processes and are not described in detail. The shaft sleeve is inserted into and installed with a stationary ring seat and a stationary ring from the other end. In addition, an annular matching groove is provided at the other end of the shaft sleeve. An axial limiter is installed between the stationary ring seat and the shaft sleeve. When the stationary ring seat is inserted from the other end of the shaft sleeve, the axial limiter is inserted and matched in the annular matching groove. The insertion and matching enables the axial limiter to rotate along the annular matching groove when the shaft sleeve rotates. On the other hand, the axial limiter limits the stationary ring seat relative to the shaft sleeve, so that the moving ring and the stationary ring are axially matched to form a sealing end face, and at the same time, the moving ring, the stationary ring seat, and the stationary ring are axially installed on the shaft sleeve to form a container-type single-end mechanical seal, thereby assembling to form a container-type single-end mechanical seal with a sealing end face. Compared with the prior art, the processing and assembly precision is high. When the present invention is installed on the pump, the shaft sleeve set seal is fixed on the rotating shaft, and the stationary ring seat is fixed on the pump body, which greatly reduces the assembly difficulty of the on-site operator, thereby helping to simplify the assembly. When the rotating shaft rotates, the rotation of the rotating shaft drives the shaft sleeve to rotate together, and the rotation of the shaft sleeve drives the moving ring seat and the moving ring to rotate relative to the stationary ring, and the axial limiter is configured to rotate along the annular matching groove or rotate with the shaft sleeve when the shaft sleeve rotates.

[0016] In addition, due to the integrated design, it can also reduce the leakage of mechanical seals caused by pump vibration or poor processing accuracy of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention provides a front view of a cartridge-type single-end mechanical seal with a cross-section.

[0018] Figure 2 The present invention discloses a container-type single-end mechanical seal with a cross-section and a three-dimensional schematic diagram from one end perspective.

[0019] Figure 3 The present invention discloses a container-type single-end mechanical seal with a cross-section and a three-dimensional schematic diagram from the perspective of another end.

[0020] Figure 4 It is a three-dimensional schematic diagram of a shaft sleeve with a dynamic ring installed according to the present invention.

[0021] Figure 5 It is a three-dimensional schematic diagram of a stationary ring seat with a stationary ring installed according to the present invention.

[0022] Figure 6 It is a three-dimensional schematic diagram of a cartridge-type single-end mechanical seal disclosed in the present invention after the stationary ring seat is removed.

[0023] Figure 7It is a three-dimensional schematic diagram of an axial limiter disclosed in the present invention.

[0024] Explanation of the reference numerals: 1-moving ring seat, 2-moving ring, 3-stationary ring seat, 4-stationary ring, 5-shaft sleeve, 6-annular matching groove, 7-axial limiter, 8-sealing end face, 9-connecting flow channel, 10-force-bearing back side, 11-lateral part, 12-vertical part, 13-arc surface, 14-fastener, 15-inner ring part, 16-sleeve hole, 17-elastic part, 18-anti-rotation pin, 19-annular groove, 20-first sealing ring, 21-second sealing ring, 22-third sealing ring. DETAILED DESCRIPTION

[0025] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0026] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0027] like Figures 1 to 7 The figure shows a cartridge-type single-end mechanical seal, which can be used for the rotary shaft seal of a pump. The basic structure of the cartridge-type single-end mechanical seal includes a dynamic ring seat 1, a dynamic ring 2, a stationary ring seat 3, a stationary ring 4, and a sleeve 5 for sealing and fixing on the rotary shaft. The sleeve 5 is integrally provided with a dynamic ring seat 1 at one end thereof, and the dynamic ring 2 is installed on the dynamic ring seat 1 to form a dynamic ring part. The stationary ring 4 and the stationary ring seat 3 are installed from the other end of the sleeve 5. In addition, an annular matching groove 6 is provided at the other end of the sleeve 5, and an axial limiter 7 is installed between the stationary ring seat 3 and the sleeve 5. When the other end of the sleeve 5 is inserted into the stationary ring seat 3, the axial limit piece 7 is inserted and fitted in the annular fitting groove 6. The insertion and fitting allows the axial limit piece 7 to rotate along the annular fitting groove 6 or rotate with the sleeve 5 when the sleeve 5 rotates. On the other hand, the axial limit piece 7 limits the stationary ring seat 3 axially relative to the sleeve 5, so that the dynamic ring 2 and the stationary ring 4 axially abut against each other to form a sealing end face 8. At the same time, the dynamic ring 2, the stationary ring seat 3, and the stationary ring 4 are all axially installed on the sleeve 5 to form a containerized single-end mechanical seal.

[0028] In this example, the moving ring 2 is axially sleeved with the moving ring seat 1 and fixed relatively with screws, so that when the shaft sleeve 5 rotates, the moving ring 2 is driven to rotate together.

[0029] A first sealing ring 20 is arranged on the inner periphery of the shaft sleeve 5 , and the shaft sleeve 5 can be sealed and fixed on the rotating shaft through the first sealing ring 20 .

[0030] In some embodiments, Figure 4 As shown, the shaft sleeve 5 is generally T-shaped, and the dynamic ring seat 1 is the transverse part of the T-shape. In order to reliably and accurately install the dynamic ring 2, the dynamic ring seat 1 is provided with an annular groove 19 around one end of the shaft sleeve 5. The dynamic ring 2 is inserted into the annular groove 19 from the other end of the shaft sleeve 5 and fits in the annular groove 19. In this way, the dynamic ring part is formed after the dynamic ring 2 is installed in the dynamic ring seat 1 of the shaft sleeve 5, which provides a reference for subsequent further high-precision assembly.

[0031] like Figure 1 , 4 As shown, a second sealing ring 21 is provided between the annular groove 19 and the movable ring 2. Since the movable ring 2 and the annular groove 19 are inserted and sleeved together, there is a fit between the inner and outer peripheries, so the second sealing ring 21 is preferably provided in two or more numbers, so as to help prevent the medium from entering the annular groove 19.

[0032] In some embodiments, Figure 1 , 2 As shown, the outer peripheral wall of the dynamic ring part and the inner peripheral wall of the part of the static ring seat 3 at one end of the shaft sleeve 5 are sleeved to form a connecting flow channel 9, which connects the medium. The static ring 4 is provided with a force-bearing back surface 10. The connecting flow channel 9 extends to the static ring 4 side to the force-bearing back surface 10. The medium presses the static ring 4 through the force-bearing back surface 10 to abut against the dynamic ring 2. In this way, on the one hand, the sealing end face 8 has a better sealing performance, and on the other hand, the medium entering the connecting flow channel 9 can be used to dissipate heat from the dynamic ring 2 and the static ring 4, which is conducive to maintaining the seal.

[0033] like Figure 1 , 6 As shown, the force-bearing back surface 8 is, for example, annularly arranged on a conical surface on the back of the stationary ring 4. Of course, the stationary ring 4 may also not be provided with a force-bearing back surface 10. In this case, the medium entering the connecting flow channel 9 can be used to dissipate heat from the dynamic ring 2 and the stationary ring 4, thereby facilitating the sealing.

[0034] Regarding the formation of the connecting flow channel 9, it is worth noting that, as mentioned above, the dynamic ring 2 is inserted into the other end of the shaft sleeve 5 and inserted into the annular groove 19 to form the dynamic ring part. The dynamic ring part provides an assembly reference, and the stationary ring 4 is connected to the stationary ring seat 3 to form the stationary ring part. Therefore, the stationary ring part is assembled with the dynamic ring part as the reference to form the connecting flow channel 9. In this way, on the one hand, a connecting flow channel 9 with higher precision is formed very conveniently. On the other hand, it provides great convenience for controlling the interval between the outer circumferential wall and the inner circumferential wall of the connecting flow channel 9 and controlling the axial length of the connecting flow channel 9. For example, the stationary ring seat 3 with different diameters can be replaced to achieve the interval control between the outer circumferential wall and the inner circumferential wall of the connecting flow channel 9, and the stationary ring seat 3 with different axial lengths can be replaced to achieve the axial length control of the connecting flow channel 9.

[0035] In some embodiments, Figure 3 As shown, the axial stopper 7 is a vertical plug plate or an L-shaped plug plate, and the vertical plug plate is inserted radially along the end surface of the stationary ring seat 3 and fits in the annular matching groove 6, while the transverse portion 11 of the L-shaped plug plate is fixedly matched with the outer peripheral wall of the stationary ring seat 3 at the end of the annular matching groove 6, and the vertical portion 12 of the L-shaped plug plate is inserted radially along the end surface of the stationary ring seat 3 and fits in the annular matching groove 6. In this way, the axial stopper 7 can rotate along the annular matching groove 6 when the shaft sleeve 5 rotates, and will not rotate with the shaft sleeve 5. The vertical portion 12 of the L-shaped plug plate can be regarded as a vertical plug plate.

[0036] In this example, if Figure 3 As shown, the axial stoppers 7 are provided in plurality and are spaced apart circumferentially along the annular matching groove 6. This helps to reduce the friction area when the vertical portion 12 moves relative to the annular matching groove 6, which helps to reduce resistance on the one hand and heat on the other.

[0037] In this example, four axial limit members 7 are provided, two of which are located on one side of the annular matching groove 6, and the other two are located on the other side opposite thereto.

[0038] like Figure 7 As shown, the end surface of the insertion portion of the vertical portion 12 is configured as an arc surface 13 adapted to the bottom surface of the annular matching groove 6. This is beneficial to reducing the situation of collision during relative movement.

[0039] Furthermore, a gap is provided between the arc surface 13 and the bottom surface of the annular matching groove 6, which is more conducive to avoiding collision.

[0040] In this example, if Figure 3 As shown, the transverse portion 11 is fixed to the outer peripheral wall by a fastener 14. This is conducive to simplifying the structure and facilitating assembly.

[0041] In some embodiments, Figure 2 ,5 As shown, the stationary ring seat 3 is provided with a sleeve hole 16 with the inner peripheral ring portion 15 as the bottom, the stationary ring 4 is inserted into the sleeve hole 16 for sleeve engagement, and the inner peripheral ring portion 15 limits the axial position of the stationary ring 4. In this way, the stationary ring seat 3 and the stationary ring 4 can be assembled in advance to form the stationary ring part, thereby facilitating the further sleeve of the stationary ring part on the shaft sleeve 5.

[0042] To seal, Figure 1 As shown, a third sealing ring 22 is provided between the stationary ring 4 and the sleeve hole 16 .

[0043] Further, such as Figure 1 , 5 As shown, the stationary ring 4 is movably sleeved with the sleeve hole 16, and an elastic member 17 and an anti-rotation pin 18 are provided between the stationary ring 4 and the inner peripheral ring portion 15. The elastic member 17 elastically presses the stationary ring 4 against the dynamic ring 2 to form a sealing end face 8, and the anti-rotation pin 18 is used to prevent the stationary ring 4 from moving in the circumferential direction. In this way, on the one hand, the stationary ring 4 is better assembled on the stationary ring seat 3, and on the other hand, in the working state, it is conducive to ensuring that the stationary ring 4 is relatively still and preventing the elastic member 17 from being damaged by rotation.

[0044] When understanding the present disclosure, if necessary, the above structure can refer to other embodiments / appendices. Figure 1 And understand, no further elaboration here.

[0045] The above description is only an illustrative embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the patent protection scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A cartridge-type single-end mechanical seal, comprising a dynamic ring seat (1), a dynamic ring (2), a static ring seat (3), and a static ring (4), characterized in that: The shaft sleeve (5) is also provided with a sleeve (5) for sealing and fixing on the rotating shaft. The shaft sleeve (5) is integrally provided with a dynamic ring seat (1) at one end thereof. The dynamic ring seat (1) is installed with a dynamic ring (2) to form a dynamic ring part. The other end of the shaft sleeve (5) is inserted into and installed with a stationary ring (4) and a stationary ring seat (3). In addition, the other end of the shaft sleeve (5) is provided with an annular matching groove (6). An axial stopper (7) is installed between the stationary ring seat (3) and the shaft sleeve (5). When the other end of the shaft sleeve (5) is inserted into the stationary ring seat (3), the axial stopper (7) is inserted into the matching groove. The axial stopper (7) is inserted into the annular matching groove (6). The insertion fit enables the axial stopper (7) to rotate along the annular matching groove (6) or rotate with the shaft sleeve (5) when the shaft sleeve (5) rotates. On the other hand, the axial stopper (7) causes the stationary ring seat (3) to be axially limited relative to the shaft sleeve (5), so that the dynamic ring (2) and the stationary ring (4) are axially abutted against each other to form a sealing end face (8). At the same time, the dynamic ring (2), the stationary ring seat (3) and the stationary ring (4) are all axially mounted on the shaft sleeve (5) to form a containerized single-end mechanical seal.

2. The cartridge type single-end mechanical seal according to claim 1, characterized in that: The outer circumferential wall of the dynamic ring portion and the inner circumferential wall of the static ring seat (3) at one end of the shaft sleeve (5) are sleeved to form a connecting flow channel (9), and the connecting flow channel (9) is connected with the medium. The static ring (4) is provided with a force-bearing back side (10) or is not provided with a force-bearing back side (10). When a force-bearing back side (10) is provided, the connecting flow channel (9) extends toward the static ring (4) side at least to the force-bearing back side (10), and the medium applies pressure to the static ring (4) through the force-bearing back side (10) to make it abut against the dynamic ring (2).

3. The cartridge type single-end mechanical seal according to claim 1, characterized in that: The axial stopper (7) is a vertical plug plate or an L-shaped plug plate, the vertical plug plate is radially inserted along the end surface of the stationary ring seat (3) and is fitted in the annular fitting groove (6), the transverse portion (11) of the L-shaped plug plate is fixedly fitted with the outer peripheral wall of the stationary ring seat (3) at the end of the annular fitting groove (6), and the vertical portion (12) of the L-shaped plug plate is radially inserted along the end surface of the stationary ring seat (3) and is fitted in the annular fitting groove (6).

4. The cartridge type single-end mechanical seal according to claim 3, characterized in that: The end surface of the insertion portion of the vertical portion (12) is arranged as an arc surface (13) adapted to the bottom surface of the annular matching groove (6).

5. The cartridge type single-end mechanical seal according to claim 4, characterized in that: A gap is provided between the arc surface (13) and the bottom surface of the annular matching groove (6).

6. The cartridge type single-end mechanical seal according to claim 3, characterized in that: The transverse portion (11) is fixed to the outer peripheral wall via a fastener (14).

7. The cartridge single-end mechanical seal according to claim 1, 2 or 3, characterized in that: The stationary ring seat (3) is provided with a sleeve hole (16) with the inner circumferential ring portion (15) as the bottom, the stationary ring (4) is inserted into and sleeved with the sleeve hole (16), and the inner circumferential ring portion (15) limits the axial position of the stationary ring (4).

8. The cartridge type single-end mechanical seal according to claim 7, characterized in that: The stationary ring (4) is movably sleeved with the sleeve hole (16), and an elastic member (17) and an anti-rotation pin (18) are provided between the stationary ring (4) and the inner circumferential ring portion (15). The elastic member (17) elastically presses the stationary ring (4) against the dynamic ring (2) to form a sealing end face (8), and the anti-rotation pin (18) is used to prevent the stationary ring (4) from moving in the circumferential direction.

9. The cartridge type single-end mechanical seal according to claim 1, 2 or 3, characterized in that: The shaft sleeve (5) is arranged in a T-shape, the movable ring seat (1) is a transverse part of the T-shape, the movable ring seat (1) is provided with an annular groove (19) surrounding one end of the shaft sleeve (5), and the movable ring (2) is inserted into the other end of the shaft sleeve (5) and is inserted and sleeved with the annular groove (19).

10. The cartridge type single-end mechanical seal according to claim 1 or 3, characterized in that: A plurality of axial limiting members (7) are provided and are spaced and distributed along the circumferential direction of the annular matching groove (6).

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