Container type mechanical seal

Abstract

The packaging type mechanical seal comprises a shaft sleeve (1) used for being fixed to a rotating shaft in a sleeving and sealing mode, a first movable ring seat (2) is integrally arranged on one side of the shaft sleeve (1), a first movable ring (3) is installed on the first movable ring seat (2) to form a first movable ring part, and the shaft sleeve (1) is installed in a static ring seat (4) and a first static ring (5) in a sleeving mode from the other side. The first movable ring (3) and the first static ring (5) abut against each other in a matched mode to form a first sealing end face (6). The packaging type mechanical seal has the advantages of being 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 mechanical seal. Background Art

[0002] Mechanical seals are widely used in the pump field. They play a good sealing role for the medium pumped by the pump and are key components.

[0003] The existing mechanical seal generally includes 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 mechanical seal disclosed in CN114776808A. In addition, there is a container-type mechanical seal, such as a container-type mechanical seal disclosed in publication number CN101985947B, and another container-type mechanical seal disclosed in publication number CN For example, a container-type mechanical seal for a process screw compressor disclosed in 112145427B, a stationary ring assembly with a rigid telescopic spacer for a mechanical seal disclosed in publication number CN117967789A, and a new container-type mechanical seal device for a desulfurization pump disclosed in publication number CN2886146Y. It can be seen from the previous multiple public technical solutions that it is currently very difficult to improve the overall principle of mechanical seals. Therefore, how to improve the technical performance requires more attention to improvements in details.

[0004] However, the existing mechanical seals are troublesome to install and have low precision, which increases the difficulty of assembly for on-site operators. The applicant will propose a containerized mechanical seal with high precision, which is conducive to simplifying assembly. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a container-type mechanical seal with high precision and conducive to simplified assembly.

[0006] Compared with the prior art, the present invention proposes a container-type mechanical seal, including a sleeve for sealing and fixing on a rotating shaft, a first moving ring seat being integrally arranged on one side of the sleeve, a first moving ring seat being installed with a first moving ring to form a first moving ring part, and a stationary ring seat and a first stationary ring being installed in the sleeve from the other side, and the first moving ring and the first stationary ring being abutted against each other to form a first sealing end face.

[0007] In some embodiments, the outer circumferential wall of the first moving ring portion is socketed with the inner circumferential wall of the stationary ring seat on one side of the sleeve to form a connecting flow channel, which connects the medium. The first 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 first stationary ring side to the force-bearing back side, and the medium applies pressure to the first stationary ring through the force-bearing back side to cause the first moving ring to be abutted against it.

[0008] In some embodiments, a second moving ring seat is further included, which is installed and fixed on the sleeve from one end on the other side of the sleeve, and the second moving ring seat is installed with a second moving ring to form a second moving ring part. The static ring seat is provided with a second static ring, and the static ring seat is provided with an inner circumferential ring portion. The first static ring is installed on the side close to the first moving ring part, and a first elastic member is arranged between the first static ring and the one side. The first elastic member elastically presses the first static ring on the first moving ring to form a first sealing end face. The second static ring is installed on the other side of the inner circumferential ring portion close to the second moving ring part, and a second elastic member is arranged between the second static ring and the other side. The second elastic member elastically presses the second static ring on the second moving ring to form a second sealing end face.

[0009] In some embodiments, the first moving ring seat is used as a base, and the first moving ring, the first stationary ring, the first elastic member, the stationary ring seat, the second elastic member, the second stationary ring, the second moving ring, and the second moving ring seat are installed along the axial direction of the sleeve from one end of the other side of the sleeve to form a containerized mechanical seal, and under the action of the first elastic member and the second elastic member, the second moving ring seat elastically presses the second moving ring, the second stationary ring, the stationary ring seat, the first stationary ring, and the first moving ring onto the first moving ring seat along the axial direction of the sleeve.

[0010] In some embodiments, the container-type mechanical seal is divided into three parts, namely, the first moving ring seat of the sleeve is installed with the first moving ring so that the sleeve serves as the first part, the first stationary ring, the stationary ring seat and the second stationary ring are connected as the second part, and the second moving ring seat is installed with the second moving ring to form the third part. During assembly, the third part axially presses the second part onto the first part to form a container-type mechanical seal.

[0011] In some embodiments, the stationary ring seat has a first socket hole set on the left side of the inner ring portion, and the first stationary ring is inserted into and socketed with the first socket hole, and / or the stationary ring seat has a second socket hole set on the right side of the inner ring portion, and the second stationary ring is inserted into and socketed with the second socket hole.

[0012] In some embodiments, a first anti-rotation pin is provided between the first stationary ring and the inner ring portion, and the first anti-rotation pin is used to hinder the circumferential movement of the first stationary ring, and / or a second anti-rotation pin is provided between the second stationary ring and the inner ring portion, and the second anti-rotation pin is used to hinder the circumferential movement of the second stationary ring.

[0013] In some embodiments, the second moving ring seat is provided with an annular end portion located on one side of the second moving ring, and the annular end portion is inserted and sleeved with the second moving ring.

[0014] In some embodiments, a retaining spring is provided at one end of the other side of the sleeve, and the retaining spring limits the axial position of the second moving ring seat.

[0015] In some embodiments, the sleeve is arranged in a T shape, the first moving ring seat is the transverse part of the T shape, the first moving ring seat is provided with an annular groove around one end of one side of the sleeve, and the first moving ring is inserted into the annular groove from one end of the other side of the sleeve and fits with the annular groove.

[0016] After adopting the above structure, compared with the prior art, the present invention has the following advantages: The present invention is improved by specially setting an integrated first dynamic ring seat on one side of the sleeve. For example, a high-precision sleeve and an integrated first dynamic ring seat are obtained by machining using a casting, a steel billet, etc. The casting and machining are conventional processes and are not described in detail. The sleeve is inserted into the installation stationary ring seat and the first stationary ring from the other side, thereby assembling to form a container-type mechanical seal with a first 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 sleeve is sealed and fixed on the rotating shaft, and the stationary ring seat is fixed on the pump body, which greatly reduces the difficulty of assembly for on-site operators, thereby helping to simplify assembly. When the rotating shaft rotates, the rotation of the rotating shaft drives the sleeve to rotate together, and the rotation of the sleeve drives the first dynamic ring seat and the first dynamic ring to rotate relative to the first stationary ring.

[0017] 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

[0018] Figure 1 It is a three-dimensional schematic diagram of a container-type mechanical seal disclosed in the present invention.

[0019] Figure 2 It is a three-dimensional schematic diagram of a container-type mechanical seal disclosed in the present invention after the stationary ring seat is removed.

[0020] Figure 3 It is a left side view of a cartridge mechanical seal disclosed in the present invention.

[0021] Figure 4 It is the AA section view.

[0022] Figure 5 It is a three-dimensional schematic diagram of a stationary ring seat disclosed in the present invention from the perspective of the other side of the shaft sleeve.

[0023] Figure 6 It is a three-dimensional schematic diagram of a stationary ring seat disclosed in the present invention from a side perspective of a shaft sleeve.

[0024] Figure 7 It is a three-dimensional schematic diagram of a shaft sleeve disclosed in the present invention.

[0025] Figure 8 It is a cross-sectional view of another cartridge mechanical seal disclosed in the present invention taken along the AA direction.

[0026] Explanation of the reference numerals: 1-sleeve, 2-first moving ring seat, 3-first moving ring, 4-stationary ring seat, 5-first stationary ring, 6-first sealing end face, 7-connecting flow channel, 8-force-bearing back face, 9-second moving ring seat, 10-second moving ring, 11-first elastic member, 12-second stationary ring, 13-second elastic member, 14-second sealing end face, 15-inner ring portion, 16-first anti-rotation pin, 17-second anti-rotation pin, 18-first sealing ring, 19-second sealing ring, 20-third sealing ring, 21-fourth sealing ring, 22-fifth sealing ring, 23-circlip, 24-annular groove, 25-first sleeve connecting hole, 26-second sleeve connecting hole, 27-annular end portion. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] like Figures 1 to 8 The figure shows a container-type mechanical seal which can be used for the rotary shaft sealing of a pump. The basic structure of the container-type mechanical seal includes a sleeve 1 which is used for sealing and fixing on the rotary shaft. The sealed fixing is sealed, for example, by a first sealing ring 18 arranged on the inner periphery of the sleeve 1. The sleeve 1 is integrally provided with a first moving ring seat 2 on one side. The first moving ring seat 2 is installed with a first moving ring 3 to form a first moving ring part. The sleeve 1 is inserted into a stationary ring seat 4 and a first stationary ring 5 from the other side. The first moving ring 3 and the first stationary ring 5 are abutted against each other to form a first sealing end face 6.

[0030] In this example, the first moving ring 3 is axially sleeved with the first moving ring seat 2 and fixed relatively with screws, so that when the shaft sleeve 1 rotates, the first moving ring 3 is driven to rotate together.

[0031] In some embodiments, Figure 4 , 7 As shown, the sleeve 1 is generally T-shaped, and the first moving ring seat 2 is the transverse part of the T-shape. In order to reliably and accurately install the first moving ring 3, the first moving ring seat 2 is provided with an annular groove 24 around one end of one side of the sleeve 1. The first moving ring 3 is inserted into the annular groove 24 from the other end of the sleeve 1 and fits in the annular groove 24. In this way, after the first moving ring 3 is installed on the first moving ring seat 2 of the sleeve 1, the sleeve 1 is used as the first part, which provides a reference for subsequent further high-precision assembly.

[0032] like Figure 4 As shown, a second sealing ring 19 is provided between the annular groove 24 and the first movable ring 3 . Since the first movable ring 3 and the annular groove 24 are inserted and sleeved together, there is a fit between the inner and outer peripheries, so the second sealing ring 19 is preferably provided in two or more numbers, so as to help prevent the medium from entering the annular groove 24 .

[0033] In some embodiments, Figure 4 As shown, it also includes a second moving ring seat 9, which is fixed on the sleeve 1 from one end of the other side of the sleeve 1, and the second moving ring seat 9 is installed with a second moving ring 10 to form a second moving ring part, and the static ring seat 4 is provided with a second static ring 12, and the static ring seat 4 is provided with an inner peripheral ring portion 15, and the inner peripheral ring portion 15 is installed with a first static ring 5 on the side close to the first moving ring part, and a first elastic member 11 is arranged between the first static ring 5 and the one side, and the first elastic member 11 elastically presses the first static ring 5 on the first moving ring 3 to form a first sealing end face 6, and the inner peripheral ring portion 15 is installed with a second static ring 12 on the other side close to the second moving ring part, and a second elastic member 13 is arranged between the second static ring 12 and the other side, and the second elastic member 13 elastically presses the second static ring 12 on the second moving ring 10 to form a second sealing end face 14. In this way, two sealing end faces, the first sealing end face 6 and the second sealing end face 14, can be formed, which can be applicable in the scene where two sealing end faces are required.

[0034] like Figure 4 , 6 As shown, the inner ring portion 15 is provided with a plurality of first blind holes distributed in sequence along the circumferential direction on one side close to the first dynamic ring portion, and the first elastic member 11 is inserted into the first blind hole. Figure 4 , 5 As shown, the inner ring portion 15 is provided with a plurality of second blind holes distributed in sequence along the circumferential direction on the other side close to the second dynamic ring portion, and the second elastic members 13 are inserted into the second blind holes.

[0035] Further, such as Figure 4As shown, with the first moving ring seat 2 as the base, the first moving ring 3, the first stationary ring 5, the first elastic member 11, the stationary ring seat 4, the second elastic member 13, the second stationary ring 12, the second moving ring 10, and the second moving ring seat 9 are installed along the axial direction of the sleeve 1 from one end of the other side of the sleeve 1 to form a container-type mechanical seal, and under the action of the first elastic member 11 and the second elastic member 13, the second moving ring seat 9 elastically presses the second moving ring 10, the second stationary ring 12, the stationary ring seat 4, the first stationary ring 5, and the first moving ring 3 onto the first moving ring seat 2 along the axial direction of the sleeve 1. In this way, the mechanical seal can be assembled before the rotating shaft is installed, and then the whole can be mounted on the rotating shaft. After the installation is in place, the stationary ring seat 4 can be fixed on the pump, which is more conducive to facilitating the on-site operator to assemble the mechanical seal on the rotating shaft.

[0036] Alternatively, the mechanical seal may be assembled first, and then the stationary ring seat 4 may be fixed on the pump so that the entire mechanical seal is installed on the pump first, and then the rotating shaft and the shaft sleeve 1 are inserted and sleeved to complete the installation. This is also convenient for on-site operators to assemble the mechanical seal on the rotating shaft.

[0037] For high-precision assembly and easy assembly, as mentioned above, after the first moving ring seat 2 of the sleeve 1 is installed with the first moving ring 3, the sleeve 1 is used as the first part. Furthermore, the present application divides the containerized mechanical seal into three parts, namely, the first part, and the first stationary ring 5, the stationary ring seat 4, and the second stationary ring 12 are connected as the second part, and the second moving ring seat 9 is installed with the second moving ring 10 to form the third part. During assembly, the third part axially presses the second part onto the first part to form a containerized mechanical seal.

[0038] When assembling the second part, first, the first elastic member 11 is inserted into the first blind hole, and then the first stationary ring 5 is inserted into the first sleeve hole 25 provided on the left side of the inner ring portion 15 of the stationary ring seat 4 for sleeve fit, and then the second elastic member 13 is inserted into the second blind hole, and the second stationary ring 12 is inserted into the second sleeve hole 26 provided on the right side of the inner ring portion 15 of the stationary ring seat 4 for sleeve fit. Or vice versa, the structure related to the second stationary ring 12 is installed first, and then the structure related to the first stationary ring 5 is installed.

[0039] Of course, other assembly orders are also possible. For example, first, the first elastic member 11 is inserted into the first blind hole, and the second elastic member 13 is inserted into the second blind hole. Then, the first stationary ring 5 is inserted into the first socket hole 25 provided on the left side of the inner ring portion 15 of the stationary ring seat 4 for socket fit, and the second stationary ring 12 is inserted into the second socket hole 26 provided on the right side of the inner ring portion 15 of the stationary ring seat 4 for socket fit.

[0040] like Figure 4 As shown, in order to achieve sealing between the first stationary ring 5 and the first sleeve hole 25, a third sealing ring 20 is also provided; Figure 4 As shown, in order to achieve sealing between the second stationary ring 12 and the second sleeve hole 26, a fourth sealing ring 21 is further provided.

[0041] like Figure 4 As shown, in order to have better reliability, a first anti-rotation pin 16 is provided between the first stationary ring 5 and the inner ring portion 15, and the first anti-rotation pin 16 is used to prevent the first stationary ring 5 from rotating in the circumferential direction. A second anti-rotation pin 17 is provided between the second stationary ring 12 and the inner ring portion 15, and the second anti-rotation pin 17 is used to prevent the second stationary ring 12 from moving in the circumferential direction.

[0042] In this example, for ease of assembly, Figure 6 As shown, the first anti-rotation pin 16 is inserted into the inner ring portion 15 on the side close to the first dynamic ring portion, and the first stationary ring 5 is correspondingly provided with a first slot. When the first stationary ring 5 and the first socket hole 25 are inserted and socketed, the first anti-rotation pin 16 is inserted and fitted in the first slot.

[0043] In this example, for ease of assembly, Figure 5 As shown, the second anti-rotation pin 17 is inserted into the inner ring portion 15 on the side close to the second dynamic ring portion, and the second stationary ring 12 is correspondingly provided with a second slot. When the second stationary ring 12 and the second sleeve hole 26 are inserted and sleeved, the second anti-rotation pin 17 is inserted and fitted in the second slot.

[0044] When assembling the third part, if Figure 4 As shown, the second moving ring seat 9 is provided with an annular end portion 27 located at one side of the second moving ring 10, and the annular end portion 27 is inserted and sleeved with the second moving ring 10, and is relatively fixed with screws to form a third part.

[0045] For sealing, a fifth sealing ring 22 is provided between the annular end 27 and the second moving ring 10 .

[0046] In this example, for the sake of assembly accuracy and convenience, the second moving ring seat 9 carries the second moving ring 10 together with one end of the other side of the sleeve 1, and the second moving ring seat 9 is fixed to the sleeve 1 with screws, so that the third part axially presses the second part onto the first part to form a containerized mechanical seal.

[0047] Furthermore, a retaining spring 23 is provided at one end of the other side of the sleeve 1. Thus, during assembly, the retaining spring 23 can be used to temporarily limit the axial position of the third part, and then the second moving ring seat 9 can be fixed to the sleeve 1 with screws, thereby facilitating assembly, and on the other hand, ensuring that the third part reliably limits the axial position of the second part.

[0048] Of course, the structure for fixing the second moving ring seat 9 on the shaft sleeve 1 can also be other structures, such as screw connection, welding, etc., but the above-mentioned set and screw fixing structure is preferred, which is not only convenient and reliable in assembly, but also conducive to assembly accuracy.

[0049] In some embodiments, Figure 4 , 8 As shown, the outer peripheral wall of the first dynamic ring part and the inner peripheral wall of the part of the stationary ring seat 4 on one side of the shaft sleeve 1 are sleeved to form a connecting flow channel 7, and the connecting flow channel 7 is connected to the medium, and the first stationary ring 5 is provided with a force-bearing back side 8 or is not provided with a force-bearing back side 8. In this way, the incoming medium provides a certain amount of cooling, which is conducive to the first sealing end face 6 being at a good working temperature.

[0050] In some embodiments, Figure 8 FIG. 2 is a cross-sectional view of another cartridge mechanical seal of the present disclosure taken along the AA direction. Figure 8 and Figure 4 The difference is that the first stationary ring 5 is provided with a force-bearing back surface 8, and the connecting flow channel 7 extends to the side of the first stationary ring 5 to the force-bearing back surface 8, and the medium presses the first stationary ring 5 through the force-bearing back surface 8 to abut against the first dynamic ring 3. In this way, the first sealing end surface 6 has a better sealing performance.

[0051] The force-bearing back surface 8 is, for example, a concave surface, an inclined surface, etc., which is arranged in an annular shape on the back surface of the first stationary ring 5 .

[0052] Regarding the formation of the connecting flow channel 7, it is worth noting that, as mentioned above, after the first moving ring seat 2 of the sleeve 1 is installed with the first moving ring 3, the sleeve 1 is used as the first part, the first part provides a reference, and the first stationary ring 5, the stationary ring seat 4, and the second stationary ring 12 are connected as the second part, and the second part is assembled with the first part as the reference. Figure 8 As shown, the stationary ring seat 4 is fitted with the first part at one end of the first dynamic ring seat 2, so that, on the one hand, a high-precision connecting flow channel 7 is formed very conveniently, and on the other hand, it provides great convenience for controlling the interval between the outer peripheral wall and the inner peripheral wall of the connecting flow channel 7, that is, it only needs to be set between the first part and the second part through the stationary ring seat 4. Therefore, the improvement of precision is conducive to the connecting flow channel 7 to play a better role.

[0053] When understanding the present disclosure, if necessary, the above structure can refer to other embodiments / appendices. Figure 1 And understand, no further elaboration here.

[0054] 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 container-type mechanical seal, characterized in that: The invention comprises a shaft sleeve (1) for being sleeved and sealed and fixed on a rotating shaft, wherein a first moving ring seat (2) is integrally provided on one side of the shaft sleeve (1), a first moving ring (3) is installed on the first moving ring seat (2) to form a first moving ring part, and the shaft sleeve (1) is sleeved from the other side to install a stationary ring seat (4) and a first stationary ring (5), and the first moving ring (3) and the first stationary ring (5) are abutted against each other to form a first sealing end face (6).

2. The cartridge mechanical seal according to claim 1, characterized in that: The outer circumferential wall of the first moving ring portion is sleeved with the inner circumferential wall of the stationary ring seat (4) on one side of the shaft sleeve (1) to form a connecting flow channel (7). The connecting flow channel (7) connects the medium. The first stationary ring (5) is provided with a force-bearing back side (8) or is not provided with a force-bearing back side (8). When a force-bearing back side (8) is provided, the connecting flow channel (7) extends toward the side of the first stationary ring (5) to the force-bearing back side (8). The medium applies pressure to the first stationary ring (5) through the force-bearing back side (8) to cause the first stationary ring (5) to be in abutment with the first moving ring (3).

3. The cartridge mechanical seal according to claim 1 or 2, characterized in that: The second movable ring seat (9) is fixedly mounted on the shaft sleeve (1) from one end of the other side of the shaft sleeve (1), the second movable ring seat (9) is mounted with a second movable ring (10) to form a second movable ring portion, the stationary ring seat (4) is provided with a second stationary ring (12), the stationary ring seat (4) is provided with an inner peripheral ring portion (15), the inner peripheral ring portion (15) is mounted with a first stationary ring (5) on a side close to the first movable ring portion, and a first elastic member is arranged between the first stationary ring (5) and the side. (11), the first elastic member (11) elastically presses the first static ring (5) onto the first dynamic ring (3) to form a first sealing end face (6), the inner ring portion (15) is provided with a second static ring (12) on the other side close to the second dynamic ring portion, a second elastic member (13) is arranged between the second static ring (12) and the other side, the second elastic member (13) elastically presses the second static ring (12) onto the second dynamic ring (10) to form a second sealing end face (14).

4. The cartridge mechanical seal according to claim 3, characterized in that: With the first moving ring seat (2) as a base, the first moving ring (3), the first stationary ring (5), the first elastic member (11), the stationary ring seat (4), the second elastic member (13), the second stationary ring (12), the second moving ring (10), and the second moving ring seat (9) are installed along the axial direction of the shaft sleeve (1) from one end of the other side of the shaft sleeve (1) to form a container-type mechanical seal, and under the action of the first elastic member (11) and the second elastic member (13), the second moving ring seat (9) elastically presses the second moving ring (10), the second stationary ring (12), the stationary ring seat (4), the first stationary ring (5), and the first moving ring (3) onto the first moving ring seat (2) along the axial direction of the shaft sleeve (1).

5. The cartridge mechanical seal according to claim 4, characterized in that: The container-type mechanical seal is divided into three parts, namely, the first moving ring seat (2) of the sleeve (1) is installed with the first moving ring (3) so that the sleeve (1) serves as the first part, the first stationary ring (5), the stationary ring seat (4) and the second stationary ring (12) are connected as the second part, and the second moving ring (10) is installed on the second moving ring seat (9) to form the third part. During assembly, the third part axially presses the second part onto the first part to form the container-type mechanical seal.

6. The cartridge mechanical seal according to claim 5, characterized in that: The stationary ring seat (4) has a first sleeve connection hole (25) provided on the left side of the inner ring portion (15), and the first stationary ring (5) is inserted into and sleeved with the first sleeve connection hole (25), and / or the stationary ring seat (4) has a second sleeve connection hole (26) provided on the right side of the inner ring portion (15), and the second stationary ring (12) is inserted into and sleeved with the second sleeve connection hole (26).

7. The cartridge mechanical seal according to claim 3, characterized in that: A first anti-rotation pin (16) is provided between the first stationary ring (5) and the inner circumferential ring portion (15), and the first anti-rotation pin (16) is used to prevent the first stationary ring (5) from rotating in the circumferential direction; and / or a second anti-rotation pin (17) is provided between the second stationary ring (12) and the inner circumferential ring portion (15), and the second anti-rotation pin (17) is used to prevent the second stationary ring (12) from moving in the circumferential direction.

8. The cartridge mechanical seal according to claim 3, characterized in that: The second moving ring seat (9) is provided with an annular end portion (27) located on one side of the second moving ring (10), and the annular end portion (27) is inserted and sleeved into the second moving ring (10).

9. The cartridge mechanical seal according to claim 3, characterized in that: A retaining spring (23) is provided at one end of the other side of the shaft sleeve (1), and the retaining spring (23) limits the axial position of the second moving ring seat (9).

10. The cartridge mechanical seal according to claim 1 or 2, characterized in that: The shaft sleeve (1) is arranged in a T-shape, the first movable ring seat (2) is a transverse portion of the T-shape, the first movable ring seat (2) is provided with an annular groove (24) surrounding one end of one side of the shaft sleeve (1), and the first movable ring (3) is inserted into the annular groove (24) from one end of the other side of the shaft sleeve (1) and is inserted and sleeved to fit the annular groove (24).

Images