A mechanical seal suitable for high speed

Abstract

The utility model provides a mechanical seal suitable for high-speed rotation, comprising a static support and a static ring fixed on the static support, a side wall of the static ring abutting against a dynamic ring, an outer wall of the dynamic ring being provided with a first support, a side of the dynamic ring facing away from the static ring being connected with a rubber bellows, a first heat dissipation slope being provided on the dynamic ring, a second heat dissipation slope being provided on the rubber bellows, the first heat dissipation slope and the second heat dissipation slope being arranged opposite to each other and forming a heat dissipation cavity, a side of the dynamic ring facing the rubber bellows being provided with a convex portion, a side of the rubber bellows facing the dynamic ring being provided with a concave portion for accommodating the convex portion, a channel being provided between the convex portion and the concave portion, and the channel being connected with the heat dissipation cavity to achieve the purpose of improving the heat dissipation.

Description

Technical Field

[0001] The utility model relates to a sealing structure, in particular to a mechanical seal suitable for high rotation speed. Background Art

[0002] At present, a Chinese patent with authorization announcement number CN21488855U discloses a novel mechanical seal structure, including a stationary ring assembly and a dynamic ring assembly arranged coaxially, the stationary ring assembly including a stationary ring seat and a stationary ring, the dynamic ring assembly including a dynamic ring, a rubber bellows, a first connecting piece, a spring, and a second connecting piece; the dynamic ring assembly and the stationary ring assembly are relatively installed so that the dynamic ring contacts the stationary ring to form a sealing pair; the rear end face of the dynamic ring includes a vertical surface and an inclined surface; the front end of the rubber bellows is a "7"-shaped lip; when the lip hugs the outer circle and the vertical surface of the dynamic ring tightly, an acute angle is formed between the inclined surface and the lip so that there is no force-bearing contact surface between the inclined surface and the lip.

[0003] Since a slope is set on the rear end face of the moving ring, when the moving ring is closed under force, the end of the moving ring close to the pump shaft is not subjected to force. Compared with the original 301 type sealing structure, it has the advantages of stable sealing surface after assembly and high cost performance.

[0004] However, during the high-speed rotation of the shaft, heat will accumulate between the dynamic ring and the rubber bellows. If the heat is not easy to dissipate, it will easily cause increased wear and tear, shortening the service life. Utility Model Content

[0005] In view of this, the utility model aims to provide a mechanical seal suitable for high rotation speeds to achieve the purpose of improving heat dissipation.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a mechanical seal suitable for high speed, including a static support and a static ring fixed on the static support, the side wall of the static ring is in contact with a dynamic ring, the outer wall of the dynamic ring is provided with a first support, the side of the dynamic ring facing away from the static ring is connected to a rubber bellows, the dynamic ring is provided with a first heat dissipation slope, the rubber bellows is provided with a second heat dissipation slope, the first heat dissipation slope and the second heat dissipation slope are arranged opposite to each other and form a heat dissipation cavity, the dynamic ring has a convex portion on the side facing the rubber bellows, the rubber bellows has a concave portion for placing the convex portion on the side facing the dynamic ring, a channel is provided between the convex portion and the concave portion, and the channel is connected to the heat dissipation cavity.

[0007] To implement the above technical solution, a certain amount of heat will be generated during the high-speed rotation of the shaft. The heat will accumulate in the heat dissipation cavity. The coolant is injected into the heat dissipation cavity along the channel. The coolant absorbs the heat to achieve the effect of cooling, thereby achieving the purpose of extending the service life.

[0008] As a preferred solution of the utility model, it also includes a second bracket, a third bracket and an elastic member, a placement plane is provided on the side of the rubber bellows facing away from the dynamic ring, the second bracket is fixed in the placement plane, a Z-shaped positioning surface is provided on the rubber bellows, the third bracket is fixed in the Z-shaped positioning surface and is opposite to the second bracket, one end of the elastic member is connected to the second bracket, and the other end is connected to the third bracket.

[0009] To implement the above technical solution, a force is applied to the second bracket and the third bracket through the elastic force of the elastic member, so that the rubber bellows can maintain contact with the shaft to improve the sealing performance, and the third bracket can be stably placed on the rubber bellows through the provision of a Z-shaped positioning surface; since the elastic member is in an inclined state, a force can be applied to the third bracket in a direction close to the shaft, thereby improving the sealing performance.

[0010] As a preferred solution of the utility model, the second bracket has a first anti-slip portion on one side close to the first bracket, and a second anti-slip portion on the other side of the second bracket, and the length of the first anti-slip portion is greater than the length of the second anti-slip portion.

[0011] To implement the above technical solution, the first anti-slip portion and the second anti-slip portion are arranged so that when the shaft rotates at high speed, it is not easy for the elastic member to separate from the second bracket due to the action of centrifugal force.

[0012] As a preferred solution of the utility model, the third bracket is connected to the heat dissipation cavity through a heat dissipation structure.

[0013] By implementing the above technical solution, heat can be transferred from the heat dissipation cavity to the inside of the heat dissipation cavity, thereby further improving the heat dissipation effect.

[0014] As a preferred solution of the utility model, the heat dissipation structure includes a mounting hole, a connecting bolt and a heat-conducting recessed hole. The mounting hole is opened on the third bracket, the heat-conducting recessed hole is opened at the end of the connecting bolt, and the connecting bolt is threadedly connected to the mounting hole and is placed in the heat dissipation cavity after passing through the rubber bellows.

[0015] By implementing the above technical solution and positioning the connecting bolt partly in the heat dissipation cavity, the coolant in the heat dissipation cavity can enter the heat conduction recessed hole, and the heat is transferred to the outside of the heat dissipation cavity through the heat conduction effect of the connecting bolt, thereby greatly improving the heat dissipation effect.

[0016] As a preferred solution of the utility model, a plurality of heat dissipation fins are fixedly connected to the outer wall of the connecting bolt.

[0017] To implement the above technical solution, during the high-speed rotation of the shaft, the heat sink fins rotate synchronously with the shaft, so that the heat sink fins actively collide with the wind to achieve the effect of heat dissipation, thereby further improving the heat dissipation.

[0018] As a preferred solution of the utility model, a groove is provided on the inner wall of the first anti-slip portion, and the outer wall of the elastic member is placed in the groove.

[0019] To implement the above technical solution, the placement of the elastic member is made more stable by setting the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 A schematic diagram showing the structure of the third bracket;

[0022] Figure 3 Schematic diagram of the structure of the second bracket.

[0023] Figure numerals: 11, static bracket; 12, static ring; 2, dynamic ring; 21, protrusion; 3, first bracket; 4, rubber bellows; 41, first heat dissipation slope; 42, second heat dissipation slope; 51, convex part; 52, concave part; 53, channel; 61, placement plane; 62, second bracket; 63, first anti-detachment part; 631, groove; 64, second anti-detachment part; 71, Z-shaped positioning surface; 72, limiting ring; 73, third bracket; 8, elastic member; 9, heat dissipation structure; 91, mounting hole; 92, connecting bolt; 93, thermal conductive recessed hole; 94, heat dissipation fin. DETAILED DESCRIPTION

[0024] 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.

[0025] A mechanical seal suitable for high speed includes a static support 11 and a static ring 12 fixed on the static support 11. A dynamic ring 2 is provided on the side wall of the static ring 12, and a protrusion 21 is provided on one side of the dynamic ring 2, and the protrusion 21 abuts against the side wall of the static ring 12. A first support 3 is fixedly connected to the outer wall of the dynamic ring 2.

[0026] A rubber bellows 4 is connected to the side of the moving ring 2 facing away from the stationary ring 12. A first heat dissipation slope 41 is provided on the side of the moving ring 2 facing the shaft, and a second heat dissipation slope 42 is provided on the rubber bellows 4; the first heat dissipation slope 41 and the second heat dissipation slope 42 are arranged opposite to each other and form a heat dissipation cavity.

[0027] A convex portion 51 is provided on the side of the dynamic ring 2 facing the rubber bellows 4. A concave portion 52 for accommodating the convex portion 51 is provided on the side of the rubber bellows 4 facing the dynamic ring 2. A channel 53 is provided between the convex portion 51 and the concave portion 52. The channel 53 is connected to the heat dissipation cavity.

[0028] The coolant is injected into the heat dissipation cavity from the channel 53 to cool and dissipate the heat of the shaft.

[0029] A placement plane 61 is provided on the side of the rubber bellows 4 facing away from the dynamic ring 2, and the second bracket 62 is fixed in the placement plane 61. A first anti-slip portion 63 is provided on the side of the second bracket 62 close to the first bracket 3, and a second anti-slip portion 64 is provided on the other side of the second bracket 62. The length of the first anti-slip portion 63 is greater than the length of the second anti-slip portion 64. A U-shaped structure is formed between the second bracket 62, the first anti-slip portion 63, and the second anti-slip portion 64.

[0030] A Z-shaped positioning surface 71 is provided on the outer wall of the rubber bellows 4, and the third bracket 73 is fixed in the Z-shaped positioning surface 71 and is opposite to the second bracket 62. A limiting ring 72 is fixedly connected to the outer wall of the rubber bellows 4, and the end of the third bracket 73 is in contact with the side wall of the limiting ring 72. The elastic member 8 is a spring, and one end of the elastic member 8 is connected to the second bracket 62, and the other end is connected to the third bracket 73.

[0031] A groove 631 is formed on the inner wall of the first anti-slip portion 63 , and the outer wall of the elastic member 8 is placed in the groove 631 .

[0032] The third bracket 73 is connected to the heat dissipation cavity through the heat dissipation structure 9. The heat dissipation structure 9 includes a mounting hole 91, a connecting bolt 92 and a heat conduction recessed hole 93. The mounting hole 91 is opened on the third bracket 73 and is arranged obliquely. The heat conduction recessed hole 93 is opened at the end of the connecting bolt 92, and the heat conduction recessed hole 93 does not penetrate the connecting bolt. The connecting bolt 92 is threadedly connected to the mounting hole 91 and passes through the rubber bellows 4 and is placed in the heat dissipation cavity, that is, the heat conduction recessed hole 93 is located in the heat dissipation cavity.

[0033] A plurality of heat dissipation fins 94 are fixedly connected to the outer wall of the connection bolt 92 .

[0034] 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 mechanical seal suitable for high rotation speed, comprising a static support (11) and a static ring (12) fixed on the static support (11), a dynamic ring (2) being abutted on the side wall of the static ring (12), a first support (3) being arranged on the outer wall of the dynamic ring (2), a rubber bellows (4) being connected to the side of the dynamic ring (2) facing away from the static ring (12), wherein: The movable ring (2) is provided with a first heat dissipation inclined surface (41), the rubber bellows (4) is provided with a second heat dissipation inclined surface (42), the first heat dissipation inclined surface (41) and the second heat dissipation inclined surface (42) are arranged opposite to each other and form a heat dissipation cavity, the movable ring (2) has a convex portion (51) on the side facing the rubber bellows (4), the rubber bellows (4) has a concave portion (52) for accommodating the convex portion (51) on the side facing the movable ring (2), a channel (53) is provided between the convex portion (51) and the concave portion (52), and the channel (53) is connected to the heat dissipation cavity.

2. A mechanical seal suitable for high speed according to claim 1, characterized in that: It also includes a second bracket (62), a third bracket (73) and an elastic member (8); a placement plane (61) is provided on the side of the rubber bellows (4) facing away from the moving ring (2); the second bracket (62) is fixed in the placement plane (61); a Z-shaped positioning surface (71) is provided on the rubber bellows (4); the third bracket (73) is fixed in the Z-shaped positioning surface (71) and is opposite to the second bracket (62); one end of the elastic member (8) is connected to the second bracket (62), and the other end is connected to the third bracket (73).

3. A mechanical seal suitable for high speed according to claim 2, characterized in that: The second bracket (62) has a first anti-slip portion (63) on one side close to the first bracket (3), and has a second anti-slip portion (64) on the other side of the second bracket (62), wherein the length of the first anti-slip portion (63) is greater than the length of the second anti-slip portion (64).

4. A mechanical seal suitable for high speed according to claim 3, characterized in that: The third bracket (73) is connected to the heat dissipation cavity via the heat dissipation structure (9).

5. A mechanical seal suitable for high speed according to claim 4, characterized in that: The heat dissipation structure (9) comprises a mounting hole (91), a connecting bolt (92) and a heat-conducting recessed hole (93); the mounting hole (91) is formed on the third bracket (73); the heat-conducting recessed hole (93) is formed at the end of the connecting bolt (92); the connecting bolt (92) is threadedly connected to the mounting hole (91) and is placed in the heat dissipation cavity after passing through the rubber bellows (4).

6. A mechanical seal suitable for high speed according to claim 5, characterized in that: A plurality of heat dissipation fins (94) are fixedly connected to the outer wall of the connecting bolt (92).

7. A mechanical seal suitable for high speed according to claim 6, characterized in that: A groove (631) is provided on the inner wall of the first anti-slip portion (63), and the outer wall of the elastic member (8) is placed in the groove (631).

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