Long-service-life single-end-face mechanical sealing mechanism

Abstract

The utility model provides a long-life single end face mechanical sealing mechanism, which comprises a static ring, a sealing ring gasket, a moving ring, a positioning frame, an elastic piece and a push plate, the static ring is fixed on the sealing ring gasket, the moving ring is fixed on a pump shaft and abuts against the static ring, the positioning frame is fixed on the pump shaft and is connected with the moving ring, and the elastic piece is fixed on the positioning frame. The pump shaft is sleeved with the push plate, the push plate is located in the positioning frame, one end of the elastic piece is connected with the positioning frame, the other end of the elastic piece is connected with the push plate, the side, back to the elastic piece, of the push plate abuts against the movable ring, a positioning ring is arranged in the positioning frame, the pump shaft is sleeved with the positioning ring, and the push plate is located between the positioning ring and the movable ring. The positioning ring is connected with a hook, and the hook is hung in the middle of the elastic piece so as to achieve the purpose of keeping good sealing performance for a long time.

Description

Technical Field

[0001] The utility model relates to a long-life single-end-face mechanical sealing mechanism. Background Art

[0002] At present, a Chinese patent with application publication number CN107654653A discloses a mechanical sealing device, including: a dynamic ring, a dynamic sealing member for sealing; a plurality of engaging grooves evenly distributed on the ring surface of the dynamic ring; a static ring, a static sealing member for sealing by cooperating with the dynamic ring; an elastic pushing component, a component arranged on the outside of the dynamic ring to drive the dynamic ring to rotate and apply axial thrust to the dynamic ring; the elastic pushing component includes a transmission seat, a push ring and a spring-pressing member, the push ring is arranged inside the transmission seat and is pressed against the end face of the dynamic ring, and the spring-pressing member is pressed between the transmission seat and the push ring; a plurality of engaging arc grooves are evenly distributed on the ring edge of the push ring; and an engaging protrusion engaging with the engaging groove of the dynamic ring is arranged on the transmission seat.

[0003] However, during the use of this mechanical sealing device, the pump shaft drives the dynamic ring to rotate at high speed. At the same time, the elastic part also rotates synchronously with the transmission seat. Due to the action of centrifugal force, the middle part of the elastic part will move toward the inner wall of the transmission seat, which will reduce the elastic force of the elastic part on the push ring, thereby affecting the sealing between the dynamic ring and the static ring. In addition, the elastic part will have a short life due to frequent and large bending. Utility Model Content

[0004] In view of this, the utility model aims to provide a long-life single-end mechanical seal mechanism to achieve the purpose of maintaining sealing for a long time.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a long-life single-end mechanical sealing mechanism, including a static ring, a sealing ring gasket, a dynamic ring, a positioning frame, an elastic member, and a push plate. The static ring is fixed on the sealing gasket ring, the dynamic ring is fixed on the pump shaft and contacts the static ring, the positioning frame is fixed on the pump shaft and connected to the dynamic ring, the push plate is sleeved on the pump shaft and located in the positioning frame, one end of the elastic member is connected to the positioning frame, and the other end is connected to the push plate, the side of the push plate facing away from the elastic member contacts the dynamic ring, a positioning ring is provided in the positioning frame, the positioning ring is sleeved on the outside of the pump shaft, the push plate is located between the positioning ring and the dynamic ring, a hook is connected to the positioning ring, and the hook is hung in the middle of the elastic member.

[0006] To implement the above technical solution, the pump shaft rotates at high speed. Due to the centrifugal force, the middle part of the elastic member tends to move away from the pump shaft. Through the pulling force of the hook, the deformation of the middle part of the elastic member is reduced, so that the elastic member maintains the elastic force on the push plate, thereby making the elastic member and the sealing mechanism have a longer service life.

[0007] As a preferred solution of the utility model, the push plate has a first bending portion and a second bending portion, the elastic member is embedded in the first bending portion, a sealing ring is arranged in the second bending portion, and the sealing ring is tightly pressed against the side wall of the dynamic ring.

[0008] To implement the above technical solution, the provision of the first bending portion makes it difficult for the elastic member to deviate from the push plate, and the provision of the sealing ring improves the sealing performance.

[0009] As a preferred solution of the utility model, a positioning column is fixedly connected to the positioning frame, a positioning hole is opened on the side wall of the positioning ring, and the positioning column passes through the positioning hole and is fixed in the positioning hole by a positioning structure.

[0010] To implement the above technical solution, the positioning ring is moved toward the positioning frame so that the positioning column is inserted into the positioning hole. The positioning ring and the positioning frame can be connected by setting the positioning structure, which is convenient for installation.

[0011] As a preferred solution of the utility model, the positioning structure includes a positioning recessed hole, a spring sheet, and an installation recessed hole. The installation recessed hole is opened on the outer wall of the positioning column. The spring sheet is arranged in a U shape and both ends are fixed in the installation hole. The positioning recessed hole is opened on the inner wall of the positioning hole. The positioning column is passed through the positioning hole and the middle part of the spring sheet is embedded in the positioning recessed hole.

[0012] To implement the above technical solution, the positioning ring is moved toward the positioning frame, the positioning column is inserted into the positioning hole, and the middle part of the spring sheet is embedded in the positioning recessed hole. Due to the friction between the spring sheet and the inner wall of the positioning recessed hole, the connection between the positioning ring and the positioning frame is achieved; during the high-speed rotation of the pump shaft, the middle part of the spring sheet tends to move toward the positioning recessed hole due to the action of centrifugal force, thereby making the connection between the positioning ring and the positioning frame more stable.

[0013] As a preferred solution of the utility model, a linkage block is arranged on the inner wall of the positioning ring, and the linkage block has a linkage plane, and the linkage plane is in conflict with the outer wall of the pump shaft.

[0014] To implement the above technical solution, the linkage block is provided so that the outer wall of the pump shaft contacts the linkage plane, so that the pump shaft can drive the positioning ring to rotate synchronously, thereby reducing the wear between the positioning ring and the pump shaft.

[0015] As a preferred solution of the utility model, the inner wall of the positioning frame is provided with a connecting protrusion, the outer wall of the moving ring is provided with a connecting recessed hole, and the connecting protrusion is embedded in the connecting recessed hole.

[0016] As a preferred solution of the utility model, the dynamic ring abuts against the static ring through the convex part, and an oil storage cavity is provided between the convex part and the pump shaft.

[0017] To implement the above technical solution, during the high-speed rotation of the pump shaft, the lubricating oil in the oil storage chamber tends to enter the gap between the dynamic ring and the static ring, so as to achieve continuous lubrication and sealing effects, thereby extending the service life.

[0018] As a preferred solution of the utility model, the outer wall of the sealing ring gasket is provided with a plurality of anti-slip protrusions, and the plurality of anti-slip protrusions are arranged along the length direction of the sealing ring gasket.

[0019] The above technical solution is implemented to facilitate the installation of the sealing ring gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram in the embodiment;

[0021] Figure 2 A schematic diagram showing the position of the positioning column;

[0022] Figure 3 To show the structural diagram of the positioning ring;

[0023] Figure 4 A cross-sectional schematic diagram showing the positioning structure.

[0024] Figure numerals: 1. static ring; 11. sealing ring gasket; 2. dynamic ring; 21. positioning frame; 22. elastic member; 23. push plate; 24. connecting protrusion; 25. connecting recess; 31. first bending portion; 32. second bending portion; 33. sealing ring; 4. positioning ring; 41. linkage block; 42. linkage plane; 5. positioning column; 51. positioning hole; 6. positioning structure; 61. positioning recess; 62. spring sheet; 63. mounting recess; 7. hook; 8. pump shaft; 9. anti-slip protrusion. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0026] A long-life single-end mechanical seal mechanism comprises a stationary ring 1, a sealing ring gasket 11, a dynamic ring 2, a positioning frame 21, an elastic member 22, and a push plate 23. The stationary ring 1 is fixed on the sealing gasket ring, and a plurality of anti-skid protrusions 9 are integrally provided on the outer wall of the sealing ring gasket 11, and the plurality of anti-skid protrusions 9 are arranged along the length direction of the sealing ring gasket 11.

[0027] The moving ring 2 is sleeved and fixed on the pump shaft 8 , and a convex portion is integrally provided at the end of the moving ring 2 . The convex portion contacts the side wall of the stationary ring 1 , and an oil storage cavity for storing lubricating oil is provided between the convex portion and the pump shaft 8 .

[0028] The positioning frame 21 is fixed on the pump shaft 8. A connecting protrusion 24 is provided on the inner wall of the positioning frame 21. A connecting recess 25 is provided on the outer wall of the moving ring 2. The connecting protrusion 24 is embedded in the connecting recess 25 so that the positioning frame 21 and the moving ring 2 can rotate synchronously.

[0029] The push plate 23 is sleeved on the pump shaft 8 and is located in the positioning frame 21. The elastic member 22 is a spring, and one end of the elastic member 22 is connected to the positioning frame 21, and the other end is connected to the push plate 23. The bending part of the positioning frame 21 is connected to the elastic member 22 so that one end of the elastic member 22 can be positioned. The push plate 23 has a first bending portion 31 and a second bending portion 32. The elastic member 22 is embedded in the first bending portion 31 to achieve the end positioning of the elastic member 22. A sealing ring 33 is arranged in the second bending portion 32, and the sealing ring 33 is tightly pressed against the side wall of the dynamic ring 2. The sealing ring 33 is an O-ring.

[0030] The side of the push plate 23 facing away from the elastic member 22 contacts the movable ring 2 .

[0031] A positioning ring 4 is arranged inside the positioning frame 21, and the positioning ring 4 is sleeved on the outside of the pump shaft 8. A linkage block 41 is integrally arranged on the inner wall of the positioning ring 4, and a linkage plane 42 is provided on the linkage block 41, and the linkage plane 42 contacts the outer wall of the pump shaft 8, so that the pump shaft 8 and the positioning ring 4 can rotate synchronously.

[0032] Two positioning posts 5 are fixedly connected to the positioning frame 21, and the two positioning posts 5 are evenly distributed along the axis of the positioning frame 21. Positioning holes 51 are opened on the side wall of the positioning ring 4, and one positioning post 5 corresponds to one positioning hole 51. The positioning post 5 is inserted into the positioning hole 51 and fixed in the positioning hole 51 by the positioning structure 6, so as to realize the connection between the positioning frame 21 and the positioning ring 4.

[0033] The positioning structure 6 includes a positioning recessed hole 61, a spring piece 62, and a mounting recessed hole 63. The mounting recessed hole 63 is provided on the outer wall of the positioning column 5, and the spring piece 62 is provided in a U shape with both ends fixed in the mounting hole. The positioning recessed hole 61 is provided on the inner wall of the positioning hole 51. The positioning column 5 is inserted into the positioning hole 51 and the middle part of the spring piece 62 is embedded in the positioning recessed hole 61.

[0034] A hook 7 is fixedly connected to the outer wall of the positioning ring 4 , and the hook 7 is hung at the middle of the elastic member 22 .

[0035] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A long-life single-end mechanical seal mechanism, comprising a stationary ring (1), a sealing ring gasket (11), a dynamic ring (2), a positioning frame (21), an elastic member (22), and a push plate (23), wherein the stationary ring (1) is fixed on the sealing gasket ring, the dynamic ring (2) is fixed on the pump shaft (8) and contacts the stationary ring (1), the positioning frame (21) is fixed on the pump shaft (8) and connected to the dynamic ring (2), the push plate (23) is sleeved on the pump shaft (8) and located in the positioning frame (21), one end of the elastic member (22) is connected to the positioning frame (21), and the other end is connected to the push plate (23), and the side of the push plate (23) facing away from the elastic member (22) contacts the dynamic ring (2), wherein: A positioning ring (4) is arranged inside the positioning frame (21), and the positioning ring (4) is sleeved on the outside of the pump shaft (8). The push plate (23) is located between the positioning ring (4) and the movable ring (2). A hook (7) is connected to the positioning ring (4), and the hook (7) is hung on the middle part of the elastic member (22).

2. A long-life single-end mechanical seal mechanism according to claim 1, characterized in that: The push plate (23) has a first bending portion (31) and a second bending portion (32), the elastic member (22) is embedded in the first bending portion (31), a sealing ring (33) is arranged in the second bending portion (32), and the sealing ring (33) is tightly pressed against the side wall of the moving ring (2).

3. The long-life single-end mechanical seal mechanism according to claim 1 is characterized by: A positioning column (5) is fixedly connected to the positioning frame (21), a positioning hole (51) is opened on the side wall of the positioning ring (4), and the positioning column (5) is inserted into the positioning hole (51) and fixed in the positioning hole (51) by a positioning structure (6).

4. A long-life single-end mechanical seal mechanism according to claim 3, characterized in that: The positioning structure (6) comprises a positioning recessed hole (61), a spring sheet (62), and a mounting recessed hole (63); the mounting recessed hole (63) is provided on the outer wall of the positioning column (5); the spring sheet (62) is arranged in a U shape and has both ends fixed in the mounting hole; the positioning recessed hole (61) is provided on the inner wall of the positioning hole (51); the positioning column (5) is inserted into the positioning hole (51) and the middle part of the spring sheet (62) is embedded in the positioning recessed hole (61).

5. The long-life single-end mechanical seal mechanism according to claim 4 is characterized in that: A linkage block (41) is arranged on the inner wall of the positioning ring (4), and a linkage plane (42) is provided on the linkage block (41), and the linkage plane (42) contacts the outer wall of the pump shaft (8).

6. The long-life single-end mechanical seal mechanism according to claim 1 is characterized by: The inner wall of the positioning frame (21) is provided with a connecting protrusion (24), the outer wall of the moving ring (2) is provided with a connecting recessed hole (25), and the connecting protrusion (24) is embedded in the connecting recessed hole (25).

7. The long-life single-end mechanical seal mechanism according to claim 1 is characterized by: The dynamic ring (2) contacts the static ring (1) via the convex portion, and an oil storage cavity is provided between the convex portion and the pump shaft (8).

8. The long-life single-end mechanical seal mechanism according to claim 1 is characterized by: The outer wall of the sealing ring gasket (11) is provided with a plurality of anti-skid protrusions (9), and the plurality of anti-skid protrusions (9) are arranged along the length direction of the sealing ring gasket (11).

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