Structure for preventing mechanical seal static ring from being pushed out

Abstract

The utility model belongs to the field of mechanical seal, and particularly relates to a structure for preventing a mechanical seal static ring from being pushed out, which comprises a static ring body, the bottom of the static ring body is fixedly connected with a static ring tail, and an anti-push-out mechanism is arranged outside the static ring body. And the anti-push-out mechanism comprises a clamping structure, a first anti-rotating pin and a second anti-rotating pin, the clamping structure comprises a connecting block, a fixing nail, a spring and a supporting column, the supporting column is fixedly connected to the outer wall of the left side of the static ring body and the middle of the interior of the static ring body, and the right end of the spring is fixedly connected to the right end of the interior of the supporting column. By arranging the two clamping structures and the two anti-rotating pins, the static ring can be effectively prevented from rotating or deviating in the working process, the design structure provides double guarantees, the stability of the static ring is further enhanced, and when external force tries to push out the static ring, the cross-shaped arrangement can provide more blocking and resistance, and the static ring is prevented from being pushed out.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a structure for preventing a static ring of a mechanical seal from being pushed out. Background Art

[0002] The static ring of a mechanical seal is an important component of a mechanical seal. It is usually installed on the shaft and cooperates with the dynamic ring to form a complete sealing ring. The static ring refers to a stationary sealing ring whose inner wall contacts the surface of the sealed component and is generally fixed to the sealing housing. The main function of the static ring is to prevent the medium from leaking from the axial direction, while providing support for the dynamic ring to ensure the stable operation of the dynamic ring. In a mechanical seal, the sealing contact surface between the static ring and the dynamic ring is very small, so it needs to remain relatively static to avoid friction and wear.

[0003] However, due to certain reasons, such as pressure fluctuations, thermal expansion, etc., the stationary ring may sometimes be pushed out of the sealing chamber, resulting in seal failure and medium leakage. In traditional mechanical seal structures, in order to prevent the stationary ring from being pushed out, some additional fixing devices or reinforcement structures are usually used. However, these methods may increase the complexity and cost of mechanical seals, and may still not effectively prevent the stationary ring from being pushed out under certain working conditions.

[0004] Therefore, we propose a structure to prevent the static ring of the mechanical seal from being pushed out to solve the above problem. Utility Model Content

[0005] The utility model aims to provide a structure for preventing a stationary ring of a mechanical seal from being pushed out, so as to solve the problem of the stationary ring being pushed out in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a structure for preventing a static ring of a mechanical seal from being pushed out, comprising a static ring body, a static ring tail being fixedly connected to the bottom of the static ring body, and an anti-pull-out mechanism being arranged outside the static ring body;

[0007] The anti-ejection mechanism includes a locking structure, an anti-rotation pin 1 and an anti-rotation pin 2. The locking structure includes a connecting block, a fixing pin, a spring and a support column. The support column is fixedly connected to the outer wall on the left side of the static ring body and the middle of the interior. The right end of the spring is fixedly connected to the right end of the interior of the support column. The left end of the spring is fixedly connected to the right side of the connecting block. The connecting block is movably connected to the interior of the support column. The right side of the fixing pin is fixedly connected to the left side of the connecting block. The anti-rotation pin 1 is fixedly connected to the front side of the static ring tail, and the anti-rotation pin 2 is fixedly connected to the back side of the static ring tail.

[0008] Preferably, an annular groove is provided on the lower surface of the tail of the stationary ring, and the annular groove can accommodate an O-ring, thereby enhancing the fit between the stationary ring and the O-ring and improving the sealing performance.

[0009] Preferably, the interior of the stationary ring body is fixedly connected with an arc edge, which can better adapt to the surface shape of the rotating shaft, and can fit closely with the rotating shaft regardless of whether it is a complete cylinder. In this way, the sealing gap caused by the irregular shape or rough surface of the rotating shaft can be reduced, thereby reducing the possibility of medium leakage.

[0010] Preferably, there are two snap-fit ​​structures, which are respectively arranged on the left and right sides of the stationary ring body and placed in a cross shape with the anti-rotation pin one and the anti-rotation pin two. The two snap-fit ​​structures can increase the stability of the stationary ring body and prevent it from rotating or shifting during operation.

[0011] Preferably, an O-ring is provided between the tail of the stationary ring and the sealing cavity. The O-ring can play a sealing role to prevent the medium from leaking from the tail of the stationary ring and improve the sealing performance.

[0012] Preferably, the head of the fixing pin is conical, because the static ring needs to maintain a stable position to prevent medium leakage or the static ring from being pushed out. The close fit between the conical fixing pin and the pressure cover can effectively enhance the connection force between the static ring and the pressure cover, thereby improving the reliability of the seal.

[0013] Preferably, the arc-shaped edge fits with the inside of the static ring body, and the arc-shaped edge is made of rubber material, which can play a secondary sealing effect, ensure the sealing performance, and have a good sealing effect.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The structure for preventing the static ring of the mechanical seal from being pushed out can effectively prevent the static ring from rotating or deflecting during operation by providing two engaging structures and two anti-rotation pins. This design structure provides double protection and further enhances the stability of the static ring. When an external force attempts to push the static ring out, the cross-shaped setting can provide more blocking and resistance to prevent the static ring from being pushed out.

[0016] 2. The structure to prevent the static ring of the mechanical seal from being pushed out adopts a curved edge made of rubber material, which has a certain elasticity and recovery, can better adapt to the surface changes of the rotating shaft, enhance the stability of the static ring, and reduce the risk of being pushed out. When under pressure, it can fit more closely on the rotating shaft, further enhancing the sealing effect. In addition, the rubber material can also absorb some vibration and impact, reducing damage to the sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model when viewed from above;

[0018] Figure 2 It is a schematic diagram of the overall front structure of the utility model;

[0019] Figure 3 This is a schematic cross-sectional structural diagram of the static ring body of the utility model;

[0020] Figure 4 It is a schematic diagram of the locking structure of the utility model.

[0021] In the figure: 1 static ring body, 2 snap-fit ​​structure, 201 connecting block, 202 fixing nail, 203 spring, 204 supporting column, 3 static ring tail, 401 anti-rotation pin 1, 402 anti-rotation pin 2, 5 annular groove, 6 arc edge. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 4 , the utility model provides a technical solution: a structure for preventing the static ring of a mechanical seal from being pushed out, including a static ring body 1, which serves as the basis of the overall structure, is fixedly connected to other components and plays a core supporting role, a static ring tail 3 is fixedly connected to the bottom of the static ring body 1, and an annular groove 5 is provided on the lower surface of the static ring tail 3, and an O-ring is provided between the static ring tail 3 and the sealing cavity. When an external force attempts to push out the static ring body 1, the O-ring will provide additional resistance to enhance the anti-pushout effect of the static ring body 1. An arc-shaped edge 6 is fixedly connected to the inside of the static ring body 1, and the arc-shaped edge 6 fits with the inside of the static ring body 1. The arc-shaped edge 6 is made of rubber material and adapts to the surface shape of the rotating shaft. Whether the rotating shaft is completely cylindrical or not, it can fit tightly with it. Reduce the sealing gap caused by the irregular shape of the rotating shaft or the rough surface, thereby reducing the possibility of medium leakage. An anti-pushout mechanism is provided on the outside of the static ring body 1;

[0024] The anti-pushing mechanism includes a snap-fit ​​structure 2, an anti-rotation pin 1 401 and an anti-rotation pin 2 402. The snap-fit ​​structure 2 includes a connecting block 201, a fixing pin 202, a spring 203 and a support column 204. The support column 204 is fixedly connected to the outer wall on the left side of the stationary ring body 1 and the middle of the interior. The right end of the spring 203 is fixedly connected to the right end inside the support column 204. The left end of the spring 203 is fixedly connected to the right side of the connecting block 201. The connecting block 201 is movably connected to the interior of the support column 204. The right side of the fixing pin 202 is fixedly connected to the left side of the connecting block 201. The fixing pin 202 is fixedly connected to the left side of the connecting block 201. 02 The head is conical and fits tightly with the pressure cover to enhance the connection force between the static ring body 1 and the pressure cover and improve the reliability of the seal; the anti-rotation pin 401 is fixedly connected to the front of the static ring tail 3, and the anti-rotation pin 402 is fixedly connected to the back of the static ring tail 3. There are two locking structures 2, which are respectively arranged on the left and right sides of the static ring body 1, and are placed in a cross shape with the anti-rotation pin 401 and the anti-rotation pin 402. The anti-rotation pin 401 and the anti-rotation pin 402 are respectively fixed to the front and back of the static ring tail 3 to prevent the static ring body 1 from rotating or shifting during operation.

[0025] Working principle: When installing the stationary ring body 1 in the mechanical seal device, it is necessary to align the anti-rotation pin 1 401 and the anti-rotation pin 2 402 with the groove inside the mechanical seal device. This step is to ensure that the anti-rotation pin can be accurately aligned and fixed in the predetermined position to prevent the stationary ring body 1 from rotating or deviating during operation. After alignment, it is necessary to press downward to subject the fixing pin 202 of the clamping structure 2 to pressure. Under the action of pressure, the fixing pin 202 will shrink toward the inside of the support column 204. As the fixing pin 202 shrinks, it will squeeze the connecting block 201, further moving the connecting block toward the inside of the support column 204. During the movement, the connecting block 201 will squeeze the spring 203, causing the spring 203 to move toward the inside of the support column. When the clamping structure 2 moves to the through hole inside the mechanical seal device, the pressure disappears, and the spring 203 drives the connecting block 201 and the fixing pin 202 to engage. The arc edge 6 design can better adapt to the surface shape of the rotating shaft. Regardless of whether the rotating shaft is a complete cylindrical shape, the arc edge 6 can fit closely with it. This can reduce the sealing gap caused by the irregular shape or rough surface of the rotating shaft, thereby reducing the possibility of medium leakage. The arc edge 6 is made of rubber material, which has elasticity and sealing performance. When under pressure, it can fit more closely on the rotating shaft, further enhancing the sealing effect. The O-ring plays a sealing role, preventing the medium from leaking from the static ring tail 3, and improving the sealing performance.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A structure for preventing a stationary ring of a mechanical seal from being pushed out, comprising a stationary ring body (1), characterized in that: The bottom of the stationary ring body (1) is fixedly connected to a stationary ring tail (3), and an anti-pull-out mechanism is arranged outside the stationary ring body (1); The anti-pushing mechanism comprises a locking structure (2), an anti-rotation pin 1 (401) and an anti-rotation pin 2 (402); the locking structure (2) comprises a connecting block (201), a fixing pin (202), a spring (203) and a support column (204); the support column (204) is fixedly connected to the outer wall on the left side of the stationary ring body (1) and the middle of the interior; the right end of the spring (203) is fixedly connected to the right end inside the support column (204); the left end of the spring (203) is fixedly connected to the right side of the connecting block (201); the connecting block (201) is movably connected to the interior of the support column (204); the right side of the fixing pin (202) is fixedly connected to the left side of the connecting block (201); the anti-rotation pin 1 (401) is fixedly connected to the front side of the stationary ring tail (3); and the anti-rotation pin 2 (402) is fixedly connected to the back side of the stationary ring tail (3).

2. The structure for preventing the static ring of a mechanical seal from being pushed out according to claim 1, characterized in that: An annular groove (5) is provided on the lower surface of the stationary ring tail (3).

3. The structure for preventing the static ring of a mechanical seal from being pushed out according to claim 1, characterized in that: An arc-shaped edge (6) is fixedly connected inside the stationary ring body (1).

4. The structure for preventing the static ring of a mechanical seal from being pushed out according to claim 1, characterized in that: There are two engaging structures (2), which are respectively arranged on the left and right sides of the stationary ring body (1), and are placed in a cross shape with the anti-rotation pin 1 (401) and the anti-rotation pin 2 (402).

5. The structure for preventing the static ring of a mechanical seal from being pushed out according to claim 1, characterized in that: An O-ring is arranged between the stationary ring tail (3) and the sealing cavity.

6. The structure for preventing the static ring of a mechanical seal from being pushed out according to claim 1, characterized in that: The head of the fixing nail (202) is conical.

7. The structure for preventing the static ring of a mechanical seal from being pushed out according to claim 3, characterized in that: The arc-shaped edge (6) fits in with the interior of the stationary ring body (1), and the arc-shaped edge (6) is made of rubber material.

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