A double end face shaft sealing device

Abstract

Provided is a double-end face shaft sealing device with two sets of independent dynamic and static rings, wherein a first dynamic ring 5 and a first static ring 6 are arranged in an inner cavity 4 of a mechanical seal, and a second dynamic ring 7 and a second static ring 8 are arranged outside a mechanical seal seat 3, and the contact surface of each dynamic ring and the contact surface of its static ring are tightly attached to each other to form a friction pair; a radial inner wall 9 is arranged at a closed end of the mechanical seal seat 3, the first dynamic ring 5 and the first static ring 6 are arranged on the pump inner side of the radial inner wall 9, and the second dynamic ring 7 and the second static ring 8 are arranged on the pump outer side of the radial inner wall 9; more than two pin holes 10 are provided on the radial inner wall 9, and a stop pin 11 passes through the pin hole 10, and the first static ring 6 and the second static ring 8 are respectively located on both sides of the radial inner wall 9; the two sets of dynamic and static rings are independent of each other, and their compression springs respectively manage their own dynamic rings. When there is a problem with the seal on one side, the other side is also not affected, thereby significantly improving the shaft sealing performance and the service life of the rotor pump.

Description

Technical Field

[0001] The invention relates to a double-end shaft sealing device, in particular to a double-end shaft sealing device for a rotor pump. Background Art

[0002] All kinds of conveying pumps or mixers need to be equipped with shaft sealing devices, such as rotor pumps for conveying fluid materials. Mechanical shaft sealing devices use compressed springs to force the dynamic ring that moves with the shaft and the relatively stationary static ring end faces to fit closely together to form a sealed rotating pair, and the surrounding gaps are sealed with sealing rings. When the pump is working, the dynamic ring and the static ring rub against each other, and the mechanical seals of the dynamic ring, static ring and sealing ring must withstand heat and wear. Usually, a set of dynamic and static rings and their compressed springs are used, also known as a single-end shaft sealing device. In order to enhance the sealing performance, two sets of dynamic and static rings and their compressed springs can also be used, also known as a double-end shaft sealing device. The shaft sealing of the pump is very important, and the shaft sealing of the pump has always been one of its key technologies; improving the shaft sealing performance and service life of the pump shaft seal, and reducing the pollution to the environment caused by leakage are the long-term goals pursued by technicians in this field.

[0003] The existing double-end shaft seal device for rotor pumps, such as the double-end shaft seal device disclosed in Chinese patent document CN108843614A, has the following problems: 1. The two sets of dynamic and static rings and their pressure springs are linked. If there is a problem with the seal on one side, the other side will also have problems. 2. Since the pressure spring of the dynamic and static ring group on the material side is located on the outside of the pump, the elastic force direction of the pressure spring is opposite to the pressure direction of the material. The material side cannot withstand high pressure and has poor sealing performance for materials with high viscosity. 3. Both sets of dynamic and static ring groups are located in the inner cavity of the mechanical seal, which is difficult to install. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a double-end face shaft sealing device with two sets of dynamic and static rings which are independent of each other in view of the above technical status.

[0005] The technical solution adopted by the double-end shaft sealing device of the present invention is as follows:

[0006] A double-end face shaft sealing device comprises a mechanical seal seat which is sleeved outside a rotating shaft and fixedly connected to a pump body, the pump outer side of the mechanical seal seat is a closed end with a smaller inner diameter, and a mechanical seal inner cavity is formed between the inner wall of the mechanical seal seat and the rotating shaft, characterized in that a first moving ring and a first static ring are arranged in the mechanical seal inner cavity, a second moving ring and a second static ring are arranged outside the mechanical seal seat, and the contact surface of each moving ring and the contact surface of its static ring are closely attached to each other to form a friction pair; a radial inner wall is arranged at the closed end of the mechanical seal seat, the first moving ring and the first static ring are arranged on the pump inner side of the radial inner wall, and the second moving ring and the second static ring are arranged on the pump outer side of the radial inner wall; a pin hole is provided on the radial inner wall, a stop pin passes through the pin hole, the first static ring and the second static ring are respectively located on both sides of the radial inner wall, and the two ends of the stop pin are respectively inserted into the connecting notch of the first static ring and the second static ring; a first compression spring and a first moving ring seat driving the first moving ring are arranged on the pump inner side of the first moving ring, and a second compression spring and a second moving ring seat driving the second moving ring are arranged on the pump outer side of the second moving ring.

[0007] The following is a further solution of the double-end shaft sealing device of the present invention:

[0008] The rotating shaft is fixedly connected to the impeller serving as a rotor, and is characterized in that the first dynamic ring seat is connected to the impeller via at least one transmission pin, one end of the transmission pin is tightly connected, and the other end is floatingly inserted.

[0009] One end of the driving pin is tightly fitted on the impeller, and a corresponding number of driving notches are provided on the inner side of the pump of the first dynamic ring seat for floating insertion of the driving pin.

[0010] The first movable ring seat includes a first movable ring front seat and a first movable ring rear seat. The impeller drives the first movable ring front seat to operate via a driving notch on the inner side of the first movable ring front seat pump. The first movable ring front seat and the first movable ring rear seat are respectively provided with matching notches. The first movable ring front seat drives the first movable ring rear seat to operate via the matching notches on both sides. The first compression spring is arranged between the first movable ring front seat and the first movable ring rear seat.

[0011] Two pin holes are symmetrically provided on the outer side of the pump on the impeller, and one end of two driving pins is tightly inserted into the two pin holes on the impeller. Two driving notches are also symmetrically provided on the inner side of the pump of the front seat of the first moving ring for floating insertion of the driving pins.

[0012] In order to drive each moving ring, at least two convex ribs are arranged on the outer side of the pump of the cylinder of the first moving ring rear seat along the circumference of its inner wall, and the first moving ring is provided with corresponding depressions along the circumference of its outer wall. At least two convex ribs are arranged on the inner side of the pump of the cylinder of the second moving ring seat along the circumference of its inner wall, and the second moving ring is provided with corresponding depressions along the circumference of its outer wall.

[0013] The mechanical seal seat includes a mechanical seal front seat and a mechanical seal rear seat, the pump inner end of the mechanical seal front seat is fixedly connected to the pump body, the pump outer end of the mechanical seal front seat is fixedly connected to the mechanical seal rear seat, the mechanical seal rear seat is provided with a closed end with a smaller inner diameter, and the first static ring and the second static ring are symmetrically located on both sides of the radial inner wall.

[0014] A radial positioning hole is provided on the outer side of the second dynamic ring seat pump, and a connecting pin is inserted to be fixedly connected with the rotating shaft; the second compressed spring is arranged between the second dynamic ring seat and the second dynamic ring.

[0015] First sealing rings are respectively arranged at the gaps between the first static ring, the second static ring and the closed end of the mechanical seal seat, and second sealing rings for sealing the gaps between each automatic ring and the rotating shaft are respectively arranged on the pump inner side of the first dynamic ring and the pump outer side of the second dynamic ring.

[0016] A dynamic ring gasket is arranged outside the pump of the second dynamic ring, the second pressure spring is arranged between the second dynamic ring seat and the dynamic ring gasket, and the second sealing ring of the second dynamic ring is arranged in the gap between the dynamic ring gasket and the second dynamic ring.

[0017] In the double-end face shaft seal device of the present invention, one group of dynamic and static rings and their compression springs are arranged in the inner cavity of the machine seal, and the other group of dynamic and static rings and their compression springs are arranged outside the machine seal seat. The closed end of the machine seal seat is provided with a radial inner wall, the first dynamic ring and the first static ring are arranged on the inner side of the pump of the radial inner wall, and the second dynamic ring and the second static ring are arranged on the outer side of the pump of the radial inner wall; a pin hole is provided on the radial inner wall, and the stop pin passes through the pin hole. The first static ring and the second static ring are respectively located on both sides of the radial inner wall, and the two ends of the stop pin are respectively inserted into the connecting gap of the first static ring and the second static ring; the first compression spring and the first dynamic ring seat driving the first dynamic ring are arranged on the inner side of the pump of the first dynamic ring, and the second compression spring and the second dynamic ring seat driving the second dynamic ring are arranged on the outer side of the pump of the second dynamic ring. The two groups of dynamic and static rings are independent of each other, and their compression springs manage their own dynamic rings respectively. When there is a problem with the sealing of one side, the other side is not affected. The pressure spring of the dynamic and static ring group in the inner cavity of the mechanical seal is located on the inner side of the pump. The elastic force direction of the pressure spring is the same as the pressure direction of the material, which makes the sealing better; the material side can withstand high pressure and has better sealing for materials with high viscosity. The two groups of dynamic and static ring groups are located inside and outside the inner cavity of the mechanical seal respectively, and the two dynamic ring seats are located at both ends of the mechanical seal respectively, which is convenient for installation.

[0018] The double-end face shaft sealing device of the present invention is particularly suitable for rotor pumps, and is also suitable for other liquid material conveying pumps or mixers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic cross-sectional structure diagram of a shaft sealing device of a rotor pump according to an embodiment of the present invention.

[0020] Figure 2 It is a three-dimensional schematic diagram of the front seat of the dynamic ring.

[0021] Figure 3 It is a three-dimensional schematic diagram of the rear seat of the dynamic ring.

[0022] Figure 4 , Figure 5 All of them are three-dimensional schematic diagrams of the dynamic ring of the present invention, showing different orientations respectively.

[0023] Figure 6 , Figure 7 All of them are three-dimensional schematic diagrams of the static ring of the present invention, showing different orientations respectively.

[0024] Figure 8 , Fig. 9 All of them are three-dimensional schematic diagrams of the second dynamic ring seat of the present invention, showing different orientations respectively.

[0025] Fig.10 A schematic front view of a double-blade impeller adapted for the present invention.

[0026] Fig.11 A schematic cross-sectional view of a double-blade impeller adapted for the present invention.

[0027] Fig.12 It is a schematic cross-sectional structure diagram of the shaft sealing device of the rotor pump according to the second embodiment of the present invention.

[0028] Fig.13 It is a three-dimensional schematic diagram of the front seat of the machine seal.

[0029] Fig.14 It is a three-dimensional schematic diagram of the rear seat of the machine seal.

[0030] Numbers in the figure: 1. rotating shaft; 2. pump body; 3. machine seal seat; 4. machine seal inner cavity; 5. first moving ring; 6. first static ring; 7. second moving ring; 8. second static ring; 9. radial inner wall; 10. pin hole; 11. stop pin; 12. connecting notch; 13. first compression spring; 14. first moving ring seat; 15. second compression spring; 16. second moving ring seat; 17. impeller; 18. transmission pin; 19. first moving ring front seat; 20. first moving ring rear seat; 21. driving notch; 22. pin hole; 23. convex rib; 24. depression; 25. machine seal front seat; 26. machine seal rear seat; 27. first sealing ring; 28. second sealing ring; 29. ​​moving ring gasket; 30. positioning hole. DETAILED DESCRIPTION

[0031] The following Figures 1 to 14 The specific embodiments of the present invention are described below.

[0032] Embodiment 1: Externally mounted double-end shaft seal device

[0033] like Figure 1As shown, an externally mounted double-end face shaft sealing device includes a mechanical seal seat 3 which is sleeved on the outside of the rotating shaft 1 and fixedly connected to the pump body 2. The pump outer side of the mechanical seal seat 3 is a closed end with a smaller inner diameter. A mechanical seal inner cavity 4 is formed between the inner wall of the mechanical seal seat 3 and the rotating shaft 1. A first moving ring 5 and a first static ring 6 are arranged in the mechanical seal inner cavity 4. A second moving ring 7 and a second static ring 8 are arranged outside the mechanical seal seat 3. The contact surface of each moving ring and the contact surface of its static ring are tightly attached to each other to form a friction pair. A radial inner wall 9 is arranged at the closed end of the mechanical seal seat 3. The first moving ring 5 and the first static ring 6 are arranged on the pump inner side of the radial inner wall 9. The second moving ring 7 and the second static ring 8 are arranged on the pump outer side of the radial inner wall 9. More than two pin holes 10 are provided on the radial inner wall 9. More than two stop pins 11 pass through the pin holes 10. The first static ring 6 and the second static ring 8 are respectively located on both sides of the radial inner wall 9. As shown Figure 6 , Figure 7 As shown, the first stationary ring 6 and the second stationary ring 8 are provided with more than two connection gaps 12. The two ends of the stop pin 11 are respectively inserted into the connection gaps 12 of the first stationary ring 6 and the second stationary ring 8. The first pressure spring 13 and the first moving ring seat 14 that drives the first moving ring 5 are provided inside the pump of the first moving ring 5, and the second pressure spring 15 and the second moving ring seat 16 that drives the second moving ring 7 are provided outside the pump of the second moving ring 7. Figure 1 As shown, the first stationary ring 6 and the second stationary ring 8 can be inlaid stationary rings, which are inlaid with cemented carbide or ceramic and stainless steel.

[0034] The first moving ring seat 14 is connected to the impeller 17 via at least one driving pin 18, one end of the driving pin 18 is tightly connected, and the other end is inserted in a floating manner. Fig.10 , Fig.11 As shown, one end of the driving pin 18 is tightly fitted on the impeller 17, and a corresponding number of driving notches 21 are opened on the inner side of the pump of the first dynamic ring seat 14 for the driving pin 18 to be inserted in a floating manner.

[0035] like Figure 1 and Figure 2 , Figure 3 As shown, the first movable ring seat 14 includes a first movable ring front seat 19 and a first movable ring rear seat 20, the impeller 17 drives the first movable ring front seat 19 to operate through the driving notch 21 on the inner side of the first movable ring front seat 19 pump, the first movable ring front seat 19 and the first movable ring rear seat 20 are respectively provided with matching notches, the first movable ring front seat 19 drives the first movable ring rear seat 20 to operate through the matching notches of both parties, and the first compression spring 13 is arranged between the first movable ring front seat 19 and the first movable ring rear seat 20. It is suitable to use a single large spring as the first compression spring 13.

[0036] like Fig.10 , Fig.11 As shown, the specific configuration may be as follows: two pin holes 22 are symmetrically provided on the outer side of the pump on the impeller 17, and one end of the two driving pins 18 is respectively tightly inserted into the two pin holes 22 on the impeller 17. Figure 2 As shown, two driving notches 21 are symmetrically provided on the inner side of the pump of the first moving ring front seat 19 for the driving pin 18 to be inserted in a floating manner.

[0037] In order to drive the first moving ring 5, Figure 3 As shown, at least two convex ribs 23 are provided along the inner wall circumference of the outer side of the pump of the cylinder of the first moving ring rear seat 20; Figure 4 , Figure 5 As shown, the first moving ring 5 is provided with corresponding recesses 24 along the circumference of its outer wall; the first moving ring rear seat 20 drives the first moving ring 5 by means of the cooperation between the convex ribs 23 and the recesses 24. Figure 8 , Fig. 9 As shown, at least two ribs 23 are provided along the inner wall circumference of the pump inner side of the cylinder of the second dynamic ring seat 16, referring to Figure 4 , Figure 5 The second movable ring 7 is provided with corresponding recesses 24 along the circumference of the outer wall thereof; the second movable ring seat 16 drives the second movable ring 7 by the cooperation between the convex ribs 23 and the recesses 24 .

[0038] like Figure 1 As shown, the pump inner end of the mechanical seal seat 3 is fixedly connected to the pump body 2, the mechanical seal seat 3 is provided with a closed end with a smaller inner diameter, and the first static ring 6 and the second static ring 8 are symmetrically located on both sides of the radial inner wall 9. Figure 1 or Figure 8 , Fig. 9 As shown, the second dynamic ring seat 16 has a radial positioning hole 30 on the outer side of the pump, into which a connecting pin is inserted to be fixedly connected to the rotating shaft 1. Figure 1 As shown, a second compression spring 15 is arranged between the second moving ring seat 16 and the second moving ring 7 .

[0039] like Figure 1 As shown, first sealing rings 27 are respectively arranged at the gaps between the first static ring 6, the second static ring 8 and the closed end of the mechanical seal seat 3, and second sealing rings 28 for sealing the gaps between each automatic ring and the rotating shaft 1 are respectively arranged on the inner side of the pump of the first dynamic ring 5 and the outer side of the pump of the second dynamic ring 7.

[0040] In order to facilitate the installation of the second moving ring 7 and the second compression spring 15, Figure 1 As shown, a dynamic ring gasket 29 is arranged outside the pump of the second dynamic ring 7, a second compression spring 15 is arranged between the second dynamic ring seat 16 and the dynamic ring gasket 29, and a second sealing ring 28 of the second dynamic ring 7 is arranged in the gap between the dynamic ring gasket 29 and the second dynamic ring 7. The second compression spring 15 can be a corrugated spring.

[0041] An external shaft seal device is a shaft seal device that needs to be installed on the outside of the pump, and is usually used for shaft seal devices of smaller pumps. In this embodiment, the external double-end face shaft seal device needs to be installed on the outside of the pump after the pump body 2 and the impeller 17 are assembled. Figure 1As shown, the flange end of the machine seal seat 3 is provided with a plurality of connection holes along its circumference, and the pump body 2 is provided with corresponding threaded holes. The flange end of the machine seal seat 3 fits against the outer wall of the pump body 2, and the two are fixedly connected by a plurality of bolts.

[0042] During operation, the rotating shaft 1 drives the first moving ring 5 to rotate relative to the first stationary ring 6 via the impeller 17, the transmission pin 18, the first moving ring front seat 19, and the first moving ring rear seat 20 in sequence. At the same time, the rotating shaft 1 drives the second moving ring 7 to rotate relative to the second stationary ring 8 via the second moving ring seat 16.

[0043] Embodiment 2: Built-in double-end shaft seal device

[0044] An internal shaft sealing device refers to a shaft sealing device that can be installed on the inside of the pump and is usually used for shaft sealing devices of larger pumps.

[0045] like Fig.12 As shown, in the second embodiment of the built-in double end face shaft seal device, based on the first embodiment, the mechanical seal seat 3 includes a mechanical seal front seat 25 and a mechanical seal rear seat 26, and the mechanical seal seat 3 is a component assembled by the mechanical seal front seat 25 and the mechanical seal rear seat 26. The pump inner side end of the mechanical seal front seat 25 is fixedly connected to the pump body 2, and the pump outer side end of the mechanical seal front seat 25 is fixedly connected to the mechanical seal rear seat 26. Fig.14 As shown, a closed end with a smaller inner diameter is provided at the mechanical seal rear seat 26, that is, a radial inner wall 9 is provided, and the first stationary ring 6 and the second stationary ring 8 are symmetrically located on both sides of the radial inner wall 9. Fig.13 As shown, a flange end is provided on the pump inner side of the mechanical seal front seat 25, and a plurality of connection holes are provided along the circumference of the flange end. Fig.12 As shown, the inner cavity of the pump body 2 is provided with a flange mounting cavity, and the flange end of the mechanical seal front seat 25 is embedded in the flange mounting cavity, and the mechanical seal front seat 25 is fixedly connected to the pump body 2 through a plurality of bolts from the inner cavity of the pump body 2. What is different from the first embodiment is that the outer side of the pump at the flange end of the mechanical seal front seat 25 is in contact with the pump body 2. The outer side of the pump of the mechanical seal front seat 25 is provided with a plurality of threaded holes along the circumference of its wall thickness. A flange end is also provided on the inner side of the pump of the mechanical seal rear seat 26, and a plurality of connection holes are provided along the circumference of its flange end, and the mechanical seal front seat is fixedly connected to the mechanical seal rear seat through a plurality of bolts.

[0046] The rest of the solutions are the same as those in the first embodiment.

[0047] The mechanical seal of the second embodiment is installed from the inside of the pump body, and the inlet and outlet pipes of the pump do not need to be disassembled when replacing the mechanical seal, which brings convenience to the maintenance of the rotor pump users.

Claims

1. A double-end face shaft sealing device for a rotor pump, comprising a mechanical seal seat (3) sleeved outside a rotating shaft (1) and fixedly connected to a pump body (2), the pump outer side of the mechanical seal seat (3) being a closed end with a smaller inner diameter, and a mechanical seal inner cavity (4) being formed between the inner wall of the mechanical seal seat (3) and the rotating shaft (1), characterized in that: The inner cavity (4) of the mechanical seal is provided with a first moving ring (5) and a first stationary ring (6); the outer side of the mechanical seal seat (3) is provided with a second moving ring (7) and a second stationary ring (8); the contact surface of each moving ring and the contact surface of its stationary ring are in close contact with each other to form a friction pair; the closed end of the mechanical seal seat (3) is provided with a radial inner wall (9); the first moving ring (5) and the first stationary ring (6) are provided on the pump inner side of the radial inner wall (9); the second moving ring (7) and the second stationary ring (8) are provided on the pump outer side of the radial inner wall (9); the radial inner wall (9) is provided with a pin hole (10); a stop pin (11) passes through the pin hole (10); the first stationary ring (6) and the second stationary ring (8) are respectively located on both sides of the radial inner wall (9); the two sides of the stop pin (11) are The ends are respectively inserted into the connecting notches (12) of the first stationary ring (6) and the second stationary ring (8); a first compression spring (13) and a first moving ring seat (14) for driving the first moving ring (5) are arranged on the inner side of the pump of the first moving ring (5), and a second compression spring (15) and a second moving ring seat (16) for driving the second moving ring (7) are arranged on the outer side of the pump of the second moving ring (7); the rotating shaft (1) is fixedly connected to the impeller (17) as a rotor, characterized in that the first moving ring seat (14) is connected to the impeller (17) via at least one transmission pin (18), one end of the transmission pin (18) is tightly connected, and the other end is inserted in a floating manner; the first moving ring seat (14) includes a first moving ring front seat (19) and a first moving ring front seat (19). The first movable ring rear seat (20) is provided with a first movable ring front seat (19), the impeller (17) drives the first movable ring front seat (19) to operate through a driving notch (21) on the inner side of the pump of the first movable ring front seat (19), the first movable ring front seat (19) and the first movable ring rear seat (20) are respectively provided with matching notches, the first movable ring front seat (19) drives the first movable ring rear seat (20) to operate through the matching notches of both parties, the first compressed spring (13) is arranged between the first movable ring front seat (19) and the first movable ring rear seat (20); two pin holes (22) are symmetrically provided on the outer side of the pump on the impeller (17), one end of each of the two transmission pins (18) is tightly inserted into the two pin holes (22) on the impeller (17), the pump inner side of the first movable ring front seat (19) is provided with a first movable ring rear seat (20), and the first movable ring front seat (19) is provided with a first movable ring rear seat (20) and a second movable ring rear seat (20) is provided with a first movable ring rear seat (20) and a second movable ring rear seat (20) is provided with a first movable ring rear seat (19) and a second movable ring rear seat (20) is provided with a first movable ring rear seat (20) and a first movable ring rear seat (20) is provided with a first movable ring front seat (19) and a second movable ring rear seat (20) is provided with a first movable ring rear seat (19) and a second movable ring rear seat (20) is provided with a first movable ring front ... Two driving notches (21) are symmetrically provided on the side for floating insertion of the transmission pin (18); first sealing rings (27) are respectively arranged at the gaps between the first static ring (6), the second static ring (8) and the closed end of the machine seal seat (3); second sealing rings (28) for sealing the gaps between each automatic ring and the rotating shaft (1) are respectively arranged on the pump inner side of the first dynamic ring (5) and the pump outer side of the second dynamic ring (7); a dynamic ring gasket (29) is arranged on the pump outer side of the second dynamic ring (7); the second pressure spring (15) is arranged between the second dynamic ring seat (16) and the dynamic ring gasket (29); the second sealing ring (28) of the second dynamic ring (7) is arranged in the gap between the dynamic ring gasket (29) and the second dynamic ring (7).

2. The double-end shaft seal device according to claim 1, characterized in that: One end of the driving pin (18) is tightly fitted on the impeller (17), and a corresponding number of driving notches (21) are provided on the pump inner side of the first moving ring seat (14) for floating insertion of the driving pin (18).

3. The double-end shaft seal device according to claim 1, characterized in that: The outer side of the pump of the cylinder of the first movable ring rear seat (20) is provided with at least two convex ribs (23) along the circumference of its inner wall, and the first movable ring (5) is provided with corresponding recesses (24) along the circumference of its outer wall; the inner side of the pump of the cylinder of the second movable ring seat (16) is provided with at least two convex ribs (23) along the circumference of its inner wall, and the second movable ring (7) is provided with corresponding recesses (24) along the circumference of its outer wall.

4. The double-end shaft seal device according to claim 1, characterized in that: The mechanical seal seat (3) comprises a mechanical seal front seat (25) and a mechanical seal rear seat (26); the pump inner end of the mechanical seal front seat (25) is fixedly connected to the pump body (2); the pump outer end of the mechanical seal front seat (25) is fixedly connected to the mechanical seal rear seat (26); the mechanical seal rear seat (26) is provided with a closed end with a smaller inner diameter; and the first static ring (6) and the second static ring (8) are symmetrically located on both sides of the radial inner wall (9).

5. The double-end shaft seal device according to claim 1, characterized in that: The second movable ring seat (16) is provided with a radial positioning hole (30) on the outer side of the pump, into which a connecting pin is inserted to be fixedly connected with the rotating shaft (1); the second pressure spring (15) is arranged between the second movable ring seat (16) and the second movable ring (7).

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