Double-end-face shaft end mechanical sealing structure

Abstract

The invention discloses a double-end-face shaft end mechanical sealing structure which comprises a flange seat, a spring retainer is movably embedded in the flange seat, a pushing ring is embedded between the flange seat and the spring retainer, a first screw is arranged on the pushing ring in the radial direction, and a limiting long hole matched with the first screw is formed in the spring retainer. A guide long hole for accommodating the end part of the first screw is formed in the flange seat; a positioning convex ring protruding inwards is arranged on the pushing ring, and a spring is arranged between the positioning convex ring and the end face of the spring retainer; an annular gland is arranged at the end, away from the spring, of the flange base, and a cylindrical sealing base is embedded in the gland. A first rotating ring sleeves the outer side of one end of the first transmission ring connected with the rotating shaft; a pair of first pairing rings is arranged on the sealing seat and the first rotating ring; a second pairing ring is arranged on the end face, attached to the pushing ring, of a second rotating ring arranged on the rotating shaft, a second transmission ring is embedded in one end of the second rotating ring, and a pressing screw hole is formed in the second transmission ring.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a double-end-face shaft-end mechanical seal structure. Background Art

[0002] With the continuous and rapid development of industries such as petrochemicals, oil refining, coal chemicals, electricity, metallurgy and nuclear power, these fields have put forward more stringent operating stability and reliability standards for the rotating equipment in their devices, such as various machinery, pumps and reactors. These equipment are not only the core components of the production process, but their performance directly affects the efficiency and safety of the entire production line.

[0003] Mechanical seals, as an indispensable key basic component in these rotating devices, are of great importance. Faced with increasingly complex and changing working conditions, such as high impurity content in the medium, extreme temperature and pressure, traditional mechanical seals are often unable to cope with the challenges and are prone to seal failure. Such failures will not only lead to uncontrolled leakage of fluids, thus causing environmental pollution and waste of production raw materials, but will also significantly reduce the operating efficiency of the equipment, increase maintenance costs and downtime.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a double-end face shaft end mechanical seal structure to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] A double-end-face shaft end mechanical seal structure, comprising a flange seat, a spring retainer movably embedded in the flange seat, a push ring embedded between the flange seat and the spring retainer, a radially arranged first screw on the push ring, a limiting long hole matched with the first screw on the spring retainer, and a guide long hole accommodating the end of the first screw on the flange seat; a positioning convex ring protruding inwardly is provided on the push ring, and a spring is provided between the positioning convex ring and the end face of the spring retainer;

[0008] An annular gland is provided at one end of the flange seat away from the spring, and a cylindrical sealing seat is embedded in the gland; a first rotating ring is sleeved on the outer side of one end of the first transmission ring connected to the rotating shaft; a first matching ring is respectively provided on the end surfaces of the sealing seat and the first rotating ring that are in contact with each other;

[0009] A second matching ring is respectively provided on the end faces of the second rotating ring and the pushing ring which are in contact with the rotating shaft. A second transmission ring is embedded in one end of the second rotating ring away from the second matching ring. The second transmission ring is provided with a clamping screw hole for connecting a clamping screw for clamping the rotating shaft.

[0010] Furthermore, in order to ensure the sealing inside the first transmission ring and prevent fluid leakage, the second sealing ring can ensure the dynamic sealing between the first transmission ring and the first rotating ring to prevent fluid leakage during rotation. A first sealing ring is arranged inside one end of the first transmission ring, and the outer side of one end of the first transmission ring is connected to the inner wall of the first rotating ring through several second sealing rings.

[0011] Furthermore, in order to ensure the seal between the gland and the sealing seat 1 and prevent fluid leakage, a third sealing ring is embedded in the outer wall of the gland, and a fourth sealing ring matching the sealing seat is embedded in the inner wall of the gland.

[0012] Furthermore, in order to help prevent the medium from leaking through the gap between the flange seat and the spring retainer and improve the reliability of the connection, a fifth sealing ring that matches the spring retainer is embedded in the inner wall of the flange seat.

[0013] Furthermore, in order to ensure the dynamic seal between the push ring and the spring retainer and prevent fluid leakage, the first screw ensures the tight connection between the push ring and the spring retainer to improve the stability of the device. A sixth sealing ring that cooperates with the spring retainer is embedded in the inner wall of one end of the push ring, and a seventh sealing ring that cooperates with the push ring is arranged on the outer side of the middle part of the first screw. A spring that cooperates with the spring retainer is arranged on one side of the bottom of the push ring.

[0014] Furthermore, in order to ensure the dynamic seal between the second transmission ring and the second rotating ring and prevent fluid leakage, the tightening screw hole ensures the fixation of the second transmission ring and improves the stability of the device, a plurality of eighth sealing rings that cooperate with the second rotating ring are embedded in the outer wall of one end of the second transmission ring, and a ninth sealing ring is embedded in the inner wall of the second transmission ring.

[0015] The beneficial effects of the present invention are:

[0016] 1. The structure of the present invention is reasonable and reliable. Through the distribution of the first rotating ring and the second rotating ring and the sealing seat and the second matching ring, double-end face sealing is realized to improve the sealing reliability. The various components are flexibly connected through components such as the gland, the spring retainer and the push ring, which is convenient for assembly and maintenance. In addition, since only one set of springs is designed, the sealing device can be better used in occasions with high impurity content.

[0017] 2. The present invention realizes multi-layer sealing through multiple sealing rings, thereby improving the reliability and sealing effect of the sealing device. The combination of the spring retainer and the push ring provides dynamic preload to adapt to small displacements and vibrations during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 2 is a schematic structural diagram of a double-end-face shaft-end mechanical seal structure according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 The figure is a side view of a double-end shaft end mechanical seal structure according to an embodiment of the present invention.

[0022] In the figure:

[0023] 1. First transmission ring; 2. First rotating ring; 3. Sealing seat; 4. Pressure cover; 5. Spring retainer; 6. Push ring; 7. Second matching ring; 8. Second rotating ring; 9. Second transmission ring; 10. Flange seat; 11. First sealing ring; 12. Second sealing ring; 13. Third sealing ring; 14. Fourth sealing ring; 15. Fifth sealing ring; 16. Sixth sealing ring; 17. First screw; 18. Seventh sealing ring; 19. Eighth sealing ring; 20. Spring; 21. Ninth sealing ring; 22. Tightening screw hole. DETAILED DESCRIPTION

[0024] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] According to an embodiment of the present invention, a double-end-face shaft-end mechanical seal structure is provided.

[0026] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 3 As shown, according to the double-end face shaft end mechanical seal structure of the embodiment of the present invention,

[0027] It comprises a flange seat 10, in which a spring retainer 5 is movably embedded, a push ring 6 is embedded between the flange seat 10 and the spring retainer 5, the push ring 6 is provided with a radially arranged first screw 17, the spring retainer 5 is provided with a limiting long hole matched with the first screw 17, and the flange seat 10 is provided with a guide long hole for accommodating the end of the first screw 17; the push ring 6 is provided with a positioning convex ring protruding inwardly, and a spring 20 is provided between the positioning convex ring and the end surface of the spring retainer 5;

[0028] An annular gland 4 is provided at one end of the flange seat 10 away from the spring 20, and a cylindrical sealing seat 3 is embedded in the gland 4; a first rotating ring 2 is sleeved on the outer side of one end of the first transmission ring 1 connected to the rotating shaft; a first matching ring is respectively provided on the end surfaces of the sealing seat 3 and the first rotating ring 2 that are in contact with each other;

[0029] A second matching ring 7 is respectively provided on the end faces of the second rotating ring 8 and the pushing ring 6 arranged on the rotating shaft, and a second transmission ring 9 is embedded in the side of the second rotating ring 8 away from the second matching ring 7. The second transmission ring 9 is provided with a clamping screw hole 22 for connecting a clamping screw for clamping the rotating shaft.

[0030] In one embodiment, for the above-mentioned first transmission ring 1, a first sealing ring 11 is arranged inside one end of the first transmission ring 1, and the outer side of one end of the first transmission ring 1 is connected to the inner wall of the first rotating ring 2 through a plurality of second sealing rings 12, thereby ensuring the sealing inside the first transmission ring 1 to prevent fluid leakage. The second sealing ring 12 can ensure the dynamic sealing between the first transmission ring and the first rotating ring to prevent fluid leakage during rotation.

[0031] In one embodiment, for the above-mentioned gland 4, a third sealing ring 13 is embedded in the outer wall of the gland 4, and a fourth sealing ring 14 matching with the sealing seat 3 is embedded in the inner wall of the gland 4, thereby ensuring the seal between the gland 4 and the sealing seat 3 to prevent fluid leakage.

[0032] In one embodiment, for the above-mentioned flange seat 10, a fifth sealing ring 15 matching with the spring retainer 5 is embedded in the inner wall of the flange seat 10, thereby helping to prevent the medium from leaking through the gap between the flange seat 10 and the spring retainer 5 and improving the reliability of the connection.

[0033] In one embodiment, for the push ring 6 , a sixth sealing ring 16 cooperating with the spring retainer 5 is embedded in the inner wall of one end of the push ring 6 , and a seventh sealing ring 18 cooperating with the push ring 6 is arranged on the outer side of the middle part of the first screw 17 .

[0034] It should be noted that the main function of the spring retainer 5 is to fix the spring 20 in the correct position, prevent it from being displaced due to vibration or fluid pressure during operation, and provide stable elastic support.

[0035] In one embodiment, for the above-mentioned second transmission ring 9, a plurality of eighth sealing rings 19 that cooperate with the second rotating ring 8 are embedded in the outer wall of one end of the second transmission ring 9, a ninth sealing ring 21 is embedded in the inner wall of the second transmission ring 9, and a clamping screw hole 22 is provided on the outer side of the other end of the second transmission ring 9, thereby ensuring the dynamic sealing between the second transmission ring 9 and the second rotating ring 8 to prevent fluid leakage. The clamping screw hole 22 ensures the fixation of the second transmission ring and improves the stability of the device.

[0036] Specifically, a sealing ring is a circular ring seal with a circular cross section, which is widely used in static and dynamic sealing scenarios. It has a simple design but powerful functions, and can provide reliable sealing performance in a wide range of pressure, temperature and media. The materials of the sealing ring include: nitrile rubber, fluororubber, EPDM, silicone rubber, polytetrafluoroethylene, etc.

[0037] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0038] In actual application, the double-end-face shaft-end mechanical seal structure forms a double-end-face sealing structure through the pairing combination of the first rotating ring 2 and the second rotating ring 8 with the sealing seat 3, the first matching ring and the second matching ring 7, which can effectively prevent the fluid from leaking from the shaft end and improve the reliability of the seal. Sealing rings are arranged between the first transmission ring 1 and the first rotating ring 2, between the pressure cover 4 and the sealing seat 3, between the flange seat 10 and the spring retainer 5, between the push ring 6 and the spring retainer 5, and between the second transmission ring 9 and the second rotating ring 8. These sealing rings can effectively fill the gaps between the components to prevent the fluid from leaking through these gaps, thereby ensuring the sealing of the entire device.

[0039] In summary, with the aid of the above technical solutions of the present invention, the present invention has a reasonable and reliable structure. Through the distribution of the first rotating ring 2 and the second rotating ring 8 and the sealing seat 3, the first matching ring and the second matching ring 7, double-end face sealing is achieved to improve the sealing reliability. Each component is flexibly connected through the gland 4, the spring retainer 5 and the push ring 6, etc., which is convenient for assembly and maintenance. Since only one set of springs 20 is designed, the sealing device can be better used in occasions with high impurity content. The present invention realizes multi-layer sealing through multiple sealing rings, improves the reliability and sealing effect of the sealing device, and the combination of the spring retainer 5 and the push ring 6 provides dynamic preload to adapt to small displacements and vibrations during operation.

[0040] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-end shaft end mechanical seal structure, including a flange seat, characterized in that: A spring retainer is movably embedded in the flange seat, a push ring is embedded between the flange seat and the spring retainer, the push ring is provided with a radially arranged first screw, the spring retainer is provided with a limiting long hole matched with the first screw, and the flange seat is provided with a guide long hole for accommodating the end of the first screw; the push ring is provided with a positioning convex ring protruding inwardly, and a spring is provided between the positioning convex ring and the end surface of the spring retainer; An annular gland is provided at one end of the flange seat away from the spring, and a cylindrical sealing seat is embedded in the gland; a first rotating ring is sleeved on the outer side of one end of the first transmission ring connected to the rotating shaft; a first matching ring is respectively provided on the end surfaces of the sealing seat and the first rotating ring that are in contact with each other; A second matching ring is respectively provided on the end faces of the second rotating ring and the pushing ring which are in contact with the rotating shaft. A second transmission ring is embedded in one end of the second rotating ring away from the second matching ring. The second transmission ring is provided with a clamping screw hole for connecting a clamping screw for clamping the rotating shaft.

2. A double-end shaft end mechanical seal structure according to claim 1, characterized in that: A first sealing ring is disposed inside one end of the first transmission ring, and the outer side of one end of the first transmission ring is connected to the inner wall of the first rotating ring via a plurality of second sealing rings.

3. A double-end shaft end mechanical seal structure according to claim 2, characterized in that: A third sealing ring is embedded in the outer wall of the gland, and a fourth sealing ring matched with the sealing seat is embedded in the inner wall of the gland.

4. A double-end shaft end mechanical seal structure according to claim 1, characterized in that: A fifth sealing ring matched with the spring retainer is embedded in the inner wall of the flange seat.

5. A double-end shaft end mechanical seal structure according to claim 1, characterized in that: A sixth sealing ring matched with the spring retainer is embedded in the inner wall of one end of the push ring, and a seventh sealing ring matched with the push ring is arranged on the outer side of the middle part of the first screw.

6. A double-end shaft end mechanical seal structure according to claim 1 or 2, characterized in that: A plurality of eighth sealing rings matched with the second rotating ring are embedded in the outer wall of one end of the second transmission ring, and a ninth sealing ring is embedded in the inner wall of the second transmission ring.

Images