Container type mechanical sealing structure

Abstract

The utility model relates to the technical field of mechanical sealing structures, and particularly discloses a packaging type mechanical sealing structure which comprises a first moving ring, a first static ring, a first moving ring seat, a first static ring seat and a check ring, the first moving ring is sleeved on the outer side of a shaft body through the first moving ring seat, the first static ring is fixed on the inner wall of a cavity through the first static ring seat, and the check ring is fixed on the inner wall of the cavity through the first static ring seat. The first static ring can be attached to the first moving ring to seal a gap between the cavity and the shaft body, the check ring is fixed to the shaft body and provided with a first protrusion, the first moving ring seat is provided with a first recess, the first protrusion can be inserted into the first recess, and on one hand, the check ring is used for preventing the first moving ring from moving axially, and on the other hand, the check ring is used for preventing the first moving ring from moving axially. And on the other hand, the first movable ring is driven to rotate through the first movable ring seat, connection is conducted through cooperation of the first concave part and the first protrusion of the first movable ring seat, the connection stability is better, the situation that a conventional plug pin structure is loosened due to vibration can be avoided, and transmission failure caused by loosening of the connection structure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seal structures, and particularly refers to a cartridge mechanical seal structure. Background Art

[0002] Mechanical seals are widely used in equipment such as pumps, compressors, and stirring machinery. Their main function is to cut off the leakage path between rotating components (such as shafts) and stationary structural cavities to prevent harmful media in the cavity from leaking into the external environment. A mechanical seal generally consists of two major parts: a dynamic component fixed on the shaft and a static component fixed on the cavity.

[0003] Traditional mechanical seal structures mainly include components such as sealing rings, pressure elements, a pair of metal seats capable of transmitting torque, spring seats, and sealing rings. Among them, the static component is relatively simple and usually consists of a stationary ring and a rubber sealing element sleeved in a groove. The dynamic ring and the stationary ring are a pair of friction pairs with high flatness, and a sealing surface is formed under the action of the pressure element. Under normal working conditions, the gap between the dynamic ring and the stationary ring is extremely small (usually at the micron level), which can effectively prevent internal fluid from leaking out from the sealing surface. In order to prevent the axial movement of the dynamic ring, a stop ring is usually provided on one side of the dynamic ring seat. While restricting its movement, it can also drive the dynamic ring seat to rotate together.

[0004] In traditional mechanical seal structures, the stop ring and the dynamic ring seat are usually connected by a pin. However, as an externally installed component, the pin is connected by pressing or welding. After long-term use, it is very easy to loosen under frequent impacts, which will cause the stop ring to separate from the dynamic ring seat, resulting in transmission failure. Summary of the Invention

[0005] The utility model is made in consideration of the foregoing problems. The purpose of the utility model is to provide a cartridge mechanical seal structure in which the stop ring and the dynamic ring seat are clamped through a recess and a protrusion, and the connection stability is good, which can avoid the separation of the stop ring and the dynamic ring seat.

[0006] To achieve the above purpose, the utility model provides a cartridge mechanical seal structure for sealing the gap between a cavity and a shaft body, including a first dynamic ring, a first static ring, a first dynamic ring seat, a first static ring seat, and a stop ring. The first dynamic ring is sleeved outside the shaft body through the first dynamic ring seat, the first static ring is fixed on the inner wall of the cavity through the first static ring seat, and the first static ring can be attached to the first dynamic ring to seal the gap between the cavity and the shaft body;

[0007] The stop ring is fixed on the shaft body, and a first protrusion is provided on the stop ring, and a first recess is provided on the first dynamic ring seat, and the first protrusion can be inserted into the first recess.

[0008] For the assembled mechanical seal structure described above, it further includes a second moving ring, a second moving ring seat, and a shaft sleeve. The second moving ring is sleeved outside the shaft body through the second moving ring seat. The shaft sleeve is wrapped outside the shaft body, and both ends of the shaft sleeve are connected to the stop ring and the second moving ring seat respectively.

[0009] For the assembled mechanical seal structure described above, one end of the shaft sleeve is connected to the stop ring by a screw. A second protrusion is provided at the other end of the shaft sleeve, and a second recess is provided on the second moving ring seat. The second protrusion can be inserted into the second recess.

[0010] For the assembled mechanical seal structure described above, the first protrusion, the first recess, the second protrusion, and the second recess are all set as rectangles.

[0011] For the assembled mechanical seal structure described above, it further includes a second stationary ring and a second stationary ring seat. The second stationary ring is fixed on the inner wall of the cavity through the second stationary ring seat, and the second stationary ring can be attached to the second moving ring.

[0012] For the assembled mechanical seal structure described above, it further includes a gland. The gland is fixed on the inner wall of the cavity, and the gland abuts against both the first stationary ring seat and the second stationary ring seat at the same time.

[0013] For the assembled mechanical seal structure described above, it further includes a spring. The spring is fixed on the stop ring, and one end of the spring is connected to the second stationary ring seat to drive the second stationary ring to be attached to the second moving ring.

[0014] The utility model has the following beneficial effects:

[0015] 1. By the cooperation of the recess and the protrusion to realize the connection between the stop ring and the first moving ring seat, and between the shaft sleeve and the second moving ring seat, it can avoid connecting and fixing by pins. Even if vibration occurs, it will not loosen. Therefore, the stability of the connection between the stop ring and the first moving ring seat, and between the shaft body and the second moving ring seat can be ensured, the axial displacement of the first moving ring and the second moving ring can be avoided, and the transmission effect can be ensured at the same time. Description of the Drawings

[0016] Figure 1 It is a cross-sectional view of the overall structure of the embodiment.

[0017] In the figure:

[0018] 1. First moving ring; 2. First stationary ring; 3. First moving ring seat; 4. First stationary ring seat; 5. Stop ring; 6. Second moving ring; 7. Second moving ring seat; 8. Shaft sleeve; 9. Screw; 10. Second stationary ring; 11. Second stationary ring seat; 12. Gland; 13. Spring. Detailed implementation manners

[0019] The following are specific embodiments of the present utility model and in combination with the accompanying drawings, the technical solutions of the present utility model will be further described, but the utility model is not limited to these embodiments.

[0020] As Figure 1 shown, an assembled mechanical seal structure includes a first dynamic ring 1, a first static ring 2, a first dynamic ring seat 3, a first static ring seat 4, a stop ring 5, a second dynamic ring 6, a second static ring 10, a second dynamic ring seat 7, a second static ring seat 11, a shaft sleeve 8, a gland 12 and a spring 13, and is used to seal the gap between a cavity and a shaft body.

[0021] Among them, the first dynamic ring 1 is sleeved outside the shaft body through the first dynamic ring seat 3, the first static ring 2 is fixed on the inner wall of the cavity through the first static ring seat 4, and the first static ring 2 can be attached to the first dynamic ring 1 to seal the gap between the cavity and the shaft body. The stop ring 5 is fixed on the shaft body, and a first protrusion is provided on the stop ring 5, and a first depression is provided on the first dynamic ring seat 3. The first protrusion can be inserted into the first depression. On the one hand, the stop ring 5 is used to prevent the first dynamic ring 1 from axially moving, and on the other hand, it is used to drive the first dynamic ring 1 to rotate through the first dynamic ring seat 3. And through the cooperation of the self - contained first depression and the first protrusion for connection, its connection stability is better, and it can avoid the loosening of the conventional pin structure due to vibration and avoid the transmission failure caused by the loosening of the connection structure.

[0022] In order to realize the synchronous drive of the second dynamic ring 6 and the first dynamic ring 1, the second dynamic ring 6 is sleeved outside the shaft body through the second dynamic ring seat 7, the shaft sleeve 8 is coated outside the shaft body, and both ends of the shaft sleeve 8 are connected to the stop ring 5 and the second dynamic ring seat 7 respectively. Then when the shaft body rotates, the stop ring 5 drives the shaft sleeve 8 to rotate together, uses the shaft sleeve 8 to drive the second dynamic ring seat 7 to rotate together, and the second dynamic ring seat 7 drives the second dynamic ring 6 to rotate, and the stop ring 5 synchronously drives the first dynamic ring seat 3 to rotate to realize the synchronous rotation of the first dynamic ring 1 and the second dynamic ring 6.

[0023] In order to realize the connection between both ends of the shaft sleeve 8 and the stop ring 5 and the second dynamic ring seat 7, one end of the shaft sleeve 8 is connected to the stop ring 5 through a screw 9, a second protrusion is provided on the other end of the shaft sleeve 8, and a second depression is provided on the second dynamic ring seat 7. The second protrusion can be inserted into the second depression. Adopting the connection method of the second protrusion and the second depression is also beneficial to ensuring the connection stability between the shaft sleeve 8 and the second dynamic ring seat 7.

[0024] In this embodiment, the first protrusion, the first depression, the second protrusion and the second depression are all set as rectangles, which can ensure the connection stability and avoid relative rotation.

[0025] Among them, the second stationary ring 10 is fixed on the inner wall of the cavity through the second stationary ring seat 11, and the second stationary ring 10 can be in contact with the second moving ring 6. In this embodiment, the first moving ring 1 and the second moving ring 6 are distributed along the axial direction of the shaft body. At the same time, the first stationary ring 2 and the second stationary ring 10 are also arranged along the axial direction of the shaft body, and they correspond one by one to achieve the sealing between the shaft body and the inner wall of the cavity.

[0026] In order to prevent the first stationary ring 2 and the second stationary ring 10 from rotating, the gland 12 is fixed on the inner wall of the cavity, and the gland 12 is in contact with both the first stationary ring seat 4 and the second stationary ring seat 11 at the same time to limit the rotation of the first stationary ring seat 4 and the second stationary ring seat 11 and avoid the rotation of the first stationary ring 2 and the second stationary ring 10.

[0027] In order to avoid leakage, the spring 13 is fixed on the stop ring 5, and one end of the spring 13 is connected to the second stationary ring seat 11 to drive the second stationary ring 10 to be in contact with the second moving ring 6. Especially after the second stationary ring 10 or the second moving ring 6 is worn, it can still maintain the contact state, and leakage between the second stationary ring 10 and the second moving ring 6 can be avoided.

[0028] Of course, in this embodiment, in order to ensure the connection sealing performance of each component, sealing rings can be provided between all components.

[0029] The technical solutions of the present invention have been described in detail above in conjunction with the accompanying drawings. The described embodiments are used to help understand the idea of the present invention. The specific embodiments described herein are only examples of the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0031] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

Claims

1. A container-type mechanical seal structure, used for sealing the gap between a cavity and a shaft, characterized in that: The invention comprises a first moving ring, a first stationary ring, a first moving ring seat, a first stationary ring seat and a stop ring, wherein the first moving ring is sleeved on the outer side of the shaft body through the first moving ring seat, the first stationary ring is fixed on the inner wall of the cavity through the first stationary ring seat, and the first stationary ring can be fitted with the first moving ring to seal the gap between the cavity and the shaft body; The stop ring is fixed on the shaft body, and a first protrusion is provided on the stop ring. A first recess is provided on the first moving ring seat, and the first protrusion can be inserted into the first recess.

2. A container-type mechanical seal structure according to claim 1, characterized in that: It also includes a second moving ring, a second moving ring seat and a sleeve. The second moving ring is arranged on the outer side of the shaft body through the second moving ring seat. The sleeve covers the outer side of the shaft body. The two ends of the sleeve are respectively connected to the stop ring and the second moving ring seat.

3. A container-type mechanical seal structure according to claim 2, characterized in that: One end of the sleeve is connected to the retaining ring through a screw, the other end of the sleeve is provided with a second protrusion, the second movable ring seat is provided with a second recess, and the second protrusion can be inserted into the second recess.

4. A container-type mechanical seal structure according to claim 3, characterized in that: The first protrusion, the first depression, the second protrusion and the second depression are all configured as rectangles.

5. The container-type mechanical seal structure according to claim 2, characterized in that: It also includes a second stationary ring and a second stationary ring seat. The second stationary ring is fixed on the inner wall of the cavity through the second stationary ring seat, and the second stationary ring can fit with the second moving ring.

6. A container-type mechanical seal structure according to claim 5, characterized in that: It also includes a pressure cover, which is fixed on the inner wall of the cavity, and the pressure cover abuts against the first stationary ring seat and the second stationary ring seat at the same time.

7. The container-type mechanical seal structure according to claim 5, characterized in that: It also includes a spring, which is fixed on the stop ring, and one end of the spring is connected to the second stationary ring seat to drive the second stationary ring to fit with the second moving ring.

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