Medium-pressure high-rotating-speed mechanical seal

Abstract

The utility model discloses a medium-pressure high-rotating-speed mechanical seal which comprises a movable ring, a movable shaft body, an equipment shell, a connecting static ring and a double-layer hole spiral check ring, the movable shaft body and the equipment shell are installed in the middle of the movable ring in a penetrating mode, the connecting static ring is arranged at the right end of the movable ring, and the connecting static ring is connected to the middle of a static ring base in a telescopic mode. The double-layer hole spiral check ring is arranged on the inner side of the left end of the static ring seat, and the double-layer hole spiral check ring is connected with the static ring seat through a clamping groove. According to the medium-pressure high-rotating-speed mechanical seal, the overall sealing effect is good, medium leakage is prevented, when the movable shaft body rotates at a high speed, the pressure in equipment changes, at the moment, the pressure extrudes the movable ring and the connecting static ring, the connecting static ring stretches out and draws back in the static ring base, the spring is extruded by the connecting static ring, and therefore the sealing effect is improved. And the spring is elastically deformed, so that the whole mechanical sealing device plays a good buffering role, and the change of pressure can be better coped with.

Description

Technical Field

[0001] The utility model relates to the technical field related to mechanical seals, in particular to a medium-pressure and high-speed mechanical seal. Background Art

[0002] Mechanical seal refers to a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force or magnetic force of the compensation mechanism and the cooperation of auxiliary seals. It is also referred to as mechanical seal and is widely used in shaft seals of rotating fluid machinery, such as centrifugal pumps, centrifuges, reactors or compressors.

[0003] Referring to the Chinese patent authorization announcement number CN205026100U, the authorization announcement date is 2016.02.10, which discloses a mechanical sealing device, including a mechanical sealing static ring device, a mechanical sealing dynamic ring device and a rotating shaft, wherein the mechanical sealing dynamic ring device includes an inner sleeve and an outer seat, wherein the inner sleeve is a polytetrafluoroethylene bushing, and a dynamic ring sealing ring mounting groove is provided on the inner wall of the inner sleeve. The mechanical sealing device provided by the utility model has stable corrosion resistance;

[0004] However, the prior art has the problem that it is inconvenient to adjust the mechanical seal accordingly according to the pressure change of the medium during use, and the structural design of the mechanical seal is relatively complex and the cost of use is high. For example, the comparative patents listed above have this problem.

[0005] Therefore, we proposed a medium-pressure and high-speed mechanical seal to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a medium-pressure and high-speed mechanical seal to solve the problems in the prior art proposed in the above-mentioned background technology that it is inconvenient to perform corresponding buffer adjustment on the mechanical seal according to the pressure of the medium during use, and the structural design of the mechanical seal is relatively complex and the cost of use is high.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a medium-pressure high-speed mechanical seal, comprising a dynamic ring, a movable shaft installed through the middle of the dynamic ring, and an equipment housing;

[0008] Also includes:

[0009] A connecting static ring, wherein the connecting static ring is arranged at the right end of the dynamic ring, and the connecting static ring is telescopically connected to the middle part of the static ring seat, and the static ring seat is fixedly mounted on the equipment housing;

[0010] The double-layer hole spiral retaining ring is arranged on the inner side of the left end of the stationary ring seat, and the double-layer hole spiral retaining ring is connected with the stationary ring seat by a groove.

[0011] Preferably, a buffer pad is provided between the moving ring and the movable shaft, and the movable shaft is installed through the middle of the connecting stationary ring;

[0012] Wherein, a third sealing ring is installed in the left groove of the movable ring, and the third sealing ring is sleeved on the outer surface of the left end of the movable shaft body.

[0013] Preferably, a double-layer hole spiral retaining ring is sleeved on the outer side of the left end of the connecting static ring, and the connecting static ring is connected to the movable end of the spring, and the spring is arranged in the middle of the upper end of the static ring seat.

[0014] Preferably, a first sealing ring is sleeved on the outer surface of the right end of the connecting static ring, and the first sealing ring is closely arranged between the connecting static ring and the static ring seat.

[0015] Preferably, a second sealing ring is sleeved on the outer surface of the stationary ring seat, and the second sealing ring is connected to the equipment housing by a slot.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the medium-pressure and high-speed mechanical seal has a good overall sealing effect through the arrangement of the buffer pad, the first sealing ring, the second sealing ring and the third sealing ring, and prevents leakage of the medium. Moreover, when the movable shaft rotates at a high speed, the pressure inside the equipment changes. At this time, the pressure squeezes the moving ring and the connecting static ring, so that the connecting static ring expands and contracts in the static ring seat, and the connecting static ring squeezes the spring, so that the spring undergoes elastic deformation. At this time, the entire mechanical seal device plays a good buffering role, so that it can better cope with pressure changes.

[0017] 1. A buffer pad, a first sealing ring, a second sealing ring and a third sealing ring are provided. The buffer pad and the third sealing ring are respectively arranged between the moving ring and the movable shaft body, and the first sealing ring is arranged between the connecting static ring and the static ring seat, and the second sealing ring is arranged between the connecting static ring and the equipment housing. The overall sealing performance is good to prevent leakage;

[0018] 2. A connecting static ring, a spring and a static ring seat are provided. When the rotation speed of the movable shaft is too high, causing the pressure to change, the connecting static ring and the static ring seat are driven to expand and contract, thereby squeezing the spring, causing the spring to undergo elastic deformation, thereby facilitating the buffering and protection of the entire mechanical sealing device and being able to better cope with pressure changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front view cutaway structure of the utility model.

[0020] In the figure: 1. Dynamic ring; 2. Buffer pad; 3. Connecting static ring; 4. Spring; 5. Static ring seat; 6. First sealing ring; 7. Second sealing ring; 8. Spiral retaining ring for double-layer holes; 9. Third sealing ring; 10. Movable shaft; 11. Equipment casing. DETAILED DESCRIPTION

[0021] 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.

[0022] See also Figure 1 , the utility model provides a technical solution: a medium-pressure high-speed mechanical seal, comprising a dynamic ring 1, a movable shaft 10 installed through the middle of the dynamic ring 1, and an equipment housing 11;

[0023] Also includes:

[0024] A connecting static ring 3 is arranged at the right end of the dynamic ring 1, and the connecting static ring 3 is telescopically connected to the middle of the static ring seat 5, and the static ring seat 5 is fixedly installed on the equipment housing 11;

[0025] The double-layer hole spiral retaining ring 8 is arranged on the inner side of the left end of the stationary ring seat 5, and the double-layer hole spiral retaining ring 8 and the stationary ring seat 5 are connected by a groove.

[0026] Furthermore, in this solution, a buffer pad 2 is provided between the dynamic ring 1 and the movable shaft 10, and the movable shaft 10 is installed through the middle of the static ring 3;

[0027] The third sealing ring 9 is installed in the left groove of the movable ring 1 , and the third sealing ring 9 is sleeved on the outer surface of the left end of the movable shaft 10 .

[0028] Furthermore, the outer side of the left end of the connecting stationary ring 3 is sleeved with a double-layer hole spiral retaining ring 8, and the connecting stationary ring 3 is connected to the movable end of the spring 4, and the spring 4 is arranged in the middle of the upper end of the stationary ring seat 5.

[0029] In this solution, a first sealing ring 6 is sleeved on the outer surface of the right end of the connecting static ring 3 , and the first sealing ring 6 is closely arranged between the connecting static ring 3 and the static ring seat 5 .

[0030] In this solution, a second sealing ring 7 is sleeved on the outer surface of the stationary ring seat 5 , and the second sealing ring 7 is connected to the equipment housing 11 by a slot.

[0031] When using this medium pressure high speed mechanical seal, Figure 1 As shown, a movable shaft body 10 is installed through the middle of the dynamic ring 1, and the movable shaft body 10 is installed through the static ring 3, the static ring 3 is arranged at the right end of the dynamic ring 1, and the static ring 3 is installed in the static ring seat 5 by a slot, and a third sealing ring 9 is arranged between the movable shaft body 10 and the left side of the dynamic ring 1, and a buffer pad 2 is arranged at the right end of the dynamic ring 1, a double-layer hole spiral retaining ring 8 is sleeved on the outer end of the left side of the static ring 3, and the double-layer hole spiral retaining ring 8 is connected to the static ring seat 5 by a slot, and the static ring seat 5 is fixedly installed on the equipment housing 11, and a second sealing ring 7 is arranged between the static ring seat 5 and the equipment housing 11;

[0032] Combination Figure 1 As shown, the second sealing ring 7 is sleeved on the outer side of the static ring seat 5, and the first sealing ring 6 is arranged between the second sealing ring 7 and the static ring seat 5. Through the arrangement of the buffer pad 2, the first sealing ring 6, the second sealing ring 7 and the third sealing ring 9, the overall sealing effect is good, and when the movable shaft 10 rotates at high speed, the pressure inside the equipment changes. When the pressure is too large, the dynamic ring 1 and the connected static ring 3 will be squeezed, thereby driving the connected static ring 3 to telescopically move in the static ring seat 5. At the same time, the connected static ring 3 squeezes the spring 4, causing the spring 4 to undergo elastic deformation, thereby being able to protect the entire mechanical sealing device, improve the stability of the mechanical sealing device during use, and extend the service life of the mechanical sealing device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medium-pressure, high-speed mechanical seal, comprising a dynamic ring (1), a movable shaft (10) installed through the middle of the dynamic ring (1), and a device housing (11); It is characterized in that Also includes: A connecting static ring (3), wherein the connecting static ring (3) is arranged at the right end of the dynamic ring (1), and the connecting static ring (3) is telescopically connected to the middle part of the static ring seat (5), and the static ring seat (5) is fixedly mounted on the equipment housing (11); A double-layer hole spiral retaining ring (8) is arranged on the inner side of the left end of the stationary ring seat (5), and the double-layer hole spiral retaining ring (8) is connected to the stationary ring seat (5) by a slot.

2. A medium pressure and high speed mechanical seal according to claim 1, characterized in that: A buffer pad (2) is provided between the moving ring (1) and the moving shaft (10), and the moving shaft (10) is installed through the middle of the connecting stationary ring (3); Wherein, a third sealing ring (9) is installed in the left groove of the movable ring (1), and the third sealing ring (9) is sleeved on the outer surface of the left end of the movable shaft body (10).

3. A medium pressure and high speed mechanical seal according to claim 2, characterized in that: The left end of the connecting stationary ring (3) is sleeved with a double-layer hole spiral retaining ring (8) on the outer side, and the connecting stationary ring (3) is connected to the movable end of the spring (4), and the spring (4) is arranged in the middle of the upper end of the stationary ring seat (5).

4. A medium pressure and high speed mechanical seal according to claim 3, characterized in that: The outer surface of the right end of the connecting static ring (3) is sleeved with a first sealing ring (6), and the first sealing ring (6) is arranged in a close fit between the connecting static ring (3) and the static ring seat (5).

5. A medium pressure and high speed mechanical seal according to claim 4, characterized in that: The outer surface of the stationary ring seat (5) is sleeved with a second sealing ring (7), and the second sealing ring (7) is connected to the equipment housing (11) via a slot.

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