Double-ring outward flow type mechanical sealing device with end faces

Abstract

The utility model relates to the technical field of outflow type mechanical sealing devices, and discloses a double-ring outflow type mechanical sealing device with end faces, which comprises a static ring, a moving ring, a shaft sleeve and a gland, the shaft sleeve is sleeved on a shaft body, the static ring, the moving ring and the gland are sleeved on the outer side wall of the shaft sleeve, and one end face of the static ring abuts against one end face of the moving ring. The sealing structure is characterized in that the static ring comprises an inner ring belt, an outer ring belt and a ring seat, the outer ring belt is embedded in one end face of the ring seat, and the inner ring belt is embedded in the inner side of the outer ring belt. After the double-ring-belt friction pair structure of the inner ring belt and the outer ring belt is adopted, the pressure reduction effect of the two ring belts is achieved, meanwhile, the end faces of the double ring belts are made of different materials, abrasion is different, and leakage of an outflow type friction pair is in the trend of decreasing progressively.

Description

Technical Field

[0001] This utility model relates to the technical field of outflow mechanical seal devices, specifically a double-ring belt end-face outflow mechanical seal device. Background Technology

[0002] Mechanical seals are used to seal the rotating shaft between the rotating shaft and the housing of rotating equipment. Sufficient space is typically provided for installation, forming an internal flow seal structure. When the friction pair faces rotate at high speed, the liquid film on the face flows outwards due to centrifugal force, resulting in leakage. In an internal flow mechanical seal, the pressure on the outer side of the friction pair is higher than that on the inner side, thus reducing leakage. Generally, internal flow mechanical seals can withstand higher pressures and have lower leakage than external flow mechanical seals. However, in some rotating equipment where an internal flow seal structure cannot be formed for various reasons, an external flow mechanical seal is used. In such cases, the stationary ring of the ordinary mechanical seal is not reinforced on the outer side of the friction pair, leading to high leakage and low pressure resistance, ultimately causing mechanical seal failure and affecting the operation of the rotating equipment.

[0003] To address the aforementioned issues, we propose a double-ring belt end-face outflow mechanical seal device. Utility Model Content

[0004] The purpose of this invention is to provide a double-ring end-face outflow mechanical seal device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-ring end-face outflow mechanical seal device, comprising a stationary ring, a rotating ring, a bushing, and a gland; the bushing is sleeved on a shaft; the stationary ring, the rotating ring, and the gland are all sleeved on the outer side wall of the bushing; one end face of the stationary ring abuts against one end face of the rotating ring; the side wall of the rotating ring is connected to the side wall of the bushing; the other end of the stationary ring is connected to the gland; characterized in that the stationary ring comprises an inner ring band, an outer ring band, and a ring seat; the outer ring band is embedded in one end face of the ring seat; the inner ring band is embedded inside the outer ring band.

[0006] Preferably, one end face of the moving ring is connected to the bushing via a moving ring drive pin; the stationary ring is connected to the pressure cap via a stationary ring anti-rotation pin.

[0007] Preferably, a dynamic ring seal is provided between the dynamic ring sidewall and the bushing; a static ring seal is provided directly between the stationary ring and the gland.

[0008] Preferably, a spring is sleeved on the outer wall of the stationary ring anti-rotation pin; one end of the spring abuts against the side wall of the pressure cap; the other end of the spring abuts against the stationary ring.

[0009] Compared with the prior art, the beneficial effects of this utility model are: the double-ring belt end face outflow mechanical seal device adopts the double-ring belt friction pair structure of inner ring belt and outer ring belt, and after the pressure reduction effect of the two ring belts, the material of the double ring belt end face is different and the wear is different, so the leakage of the outflow friction pair shows a decreasing trend. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the main sectional view of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the main cross-sectional structure of the stationary ring in this utility model;

[0012] Figure 3 This is a schematic diagram of a static ring structure in the prior art;

[0013] Figure 4 This is a schematic diagram showing the leakage amount of this utility model.

[0014] In the diagram: 1-Stationary ring, 101-Inner ring belt, 102-Outer ring belt, 103-Ring seat, 2-Rotating ring, 3-Shaft sleeve, 4-Gland, 5-Stationary ring seal, 6-Rotating ring seal, 7-Stationary ring anti-rotation pin, 8-Rotating ring drive pin, 9-Spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This utility model provides a technical solution: a double-ring end-face outflow mechanical seal device, including a stationary ring 1, a rotating ring 2, a bushing 3, and a pressure cap 4. The bushing 3 is sleeved on a shaft body. The stationary ring 1, the rotating ring 2, and the pressure cap 4 are all sleeved on the outer side wall of the bushing 3. One end face of the stationary ring 1 abuts against one end face of the rotating ring 2. The side wall of the rotating ring 2 is connected to the side wall of the bushing 3. The other end of the stationary ring 1 is connected to the pressure cap 4. The stationary ring 1 is composed of an inner ring band 101, an outer ring band 102, and a ring seat 103. The outer ring band 102 is embedded in one end face of the ring seat 103, and the inner ring band 101 is embedded inside the outer ring band 102.

[0017] like Figure 2As shown, the present invention employs a combined inlay structure, and the inner ring band 101 and the outer ring band 102 of the present invention provide a double sealing effect.

[0018] One end face of the moving ring 2 is connected to the bushing 3 via a moving ring drive pin 8, and the stationary ring 1 is connected to the pressure cap 4 via a stationary ring anti-rotation pin 7. A moving ring sealing ring 6 is provided between the side wall of the moving ring 2 and the bushing 3, and a stationary ring sealing ring 5 is directly provided between the stationary ring 1 and the pressure cap 4. A spring 9 is sleeved on the outer wall of the stationary ring anti-rotation pin 7, with one end of the spring 9 abutting against the side wall of the pressure cap 4 and the other end of the spring 9 abutting against the stationary ring 1.

[0019] like Figure 1 As shown, the rotating ring 2 is assembled with the bushing 3, the rotating ring seal 6, and the rotating ring drive pin 8, rotating synchronously with the equipment shaft. The stationary ring 1 is assembled with the pressure cap 4, the stationary ring seal 5, the stationary ring anti-rotation pin 7, and the spring 9, fixed to the equipment housing. The inner hole of the friction pair formed by the rotating and stationary rings is cavity A, and the atmosphere outside the equipment is cavity B. The sealing medium of this invention is located in cavity A, and the pressure in cavity A is greater than the pressure in cavity B.

[0020] like Figure 3 As shown, the existing stationary ring embedded structure can significantly improve the stationary ring's ability to withstand internal back pressure and control end face leakage.

[0021] like Figure 4 As shown, the leakage direction of the friction pair fluid film caused by the centrifugal force of the high-speed rotation of the sealing ring is direction b, and the leakage direction of the medium pressure is direction a. For external flow mechanical seals, since direction b is consistent with direction a, the leakage increases. After adopting the double-ring friction pair structure of the inner ring belt 101 and the outer ring belt 102 of this utility model, the leakage of the external flow friction pair shows a decreasing trend after the pressure reduction effect of the two inner ring belts 101 and the outer ring belt 102. At the same time, the inner ring belt 101 and the outer ring belt 102 are made of different materials and have different wear, so the leakage of the external flow friction pair shows a decreasing trend.

[0022] like Figure 4 As shown in the figure, after analysis, the micro-leakage generated by the inner ring belt 101 into the C cavity, the high-speed rotation generates turbulence to prevent further leakage, and then through the sealing of the outer ring belt 102, the leakage amount can be minimized, thereby meeting the standard leakage requirements.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-ring end face outflow mechanical sealing device, comprising a static ring (1), a dynamic ring (2), a shaft sleeve (3) and a gland (4); the shaft sleeve (3) is sleeved on a shaft body; the static ring (1), the dynamic ring (2) and the gland (4) are all sleeved on the outer wall of the shaft sleeve (3); one end face of the static ring (1) is in abutment with one end face of the dynamic ring (2); the side wall of the dynamic ring (2) is connected with the side wall of the shaft sleeve (3); the other end of the static ring (1) is connected with the gland (4); characterized in that, The static ring (1) comprises an inner ring band (101), an outer ring band (102) and a ring seat (103); the outer ring band (102) is inlaid on one end surface of the ring seat (103); the inner side of the outer ring band (102) is inlaid with the inner ring band (101).

2. A double mechanical seal assembly of the face-to-face outflow type according to claim 1, characterized in that, One end surface of the dynamic ring (2) is connected with the shaft sleeve (3) through a dynamic ring transmission pin (8); the static ring (1) is connected with the gland (4) through a static ring anti-rotation pin (7).

3. A double mechanical seal assembly of the face-to-face outboard flow type as described in claim 1 wherein, A dynamic ring sealing ring (6) is arranged between the side wall of the dynamic ring (2) and the shaft sleeve (3); a static ring sealing ring (5) is directly arranged between the static ring (1) and the gland (4).

4. A dual meandering band face type outflow mechanical sealing device according to claim 2, wherein The outer side wall of the static ring anti-rotation pin (7) is sleeved with a spring (9); one end of the spring (9) abuts against the side wall of the gland (4); the other end of the spring (9) abuts against the static ring (1).

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