Single-end-face mechanical sealing structure of step shaft

Abstract

A single-end-face mechanical sealing structure of a step shaft comprises a movable ring assembly, a static ring assembly and the step shaft composed of a first step shaft, a second step shaft and a third step shaft. The moving ring assembly comprises a moving ring seat a and a moving ring seat b which are provided with a moving ring a and a moving ring b respectively and located on the first step shaft and the second step shaft. The static ring assembly comprises a first sealed cabin provided with a spring and a static ring a and a second sealed cabin gland which extrudes a movable ring b through a small spring, and tight attaching is achieved. The whole structure is fixedly connected with the sealing cylinder through the gland, and the sealing performance is improved through the sealing rubber ring in the sealing groove. Through the multi-stage sealing design, the drainage groove and the compact configuration of the step shaft, the sealing effect is enhanced, the operation efficiency is improved, and the equipment space is saved. The design elements ensure high efficiency, reliability and economical efficiency of the structure, are convenient to install and maintain, and are beneficial to miniaturization and integrated design of equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical seals and relates to a single - end mechanical seal structure for a stepped shaft. Background Technique

[0002] In industrial equipment, mechanical seal structures are widely used to prevent the leakage of liquids or gases. Especially in rotating equipment such as pumps, agitators, and compressors, mechanical seals are an important part to keep the equipment running normally. Traditional mechanical seal structures usually include a dynamic ring and a static ring, which form a tight contact between them to prevent the leakage of the medium. However, these seal structures may encounter reliability and maintenance problems when facing high - speed, high - pressure, or corrosive media.

[0003] The single - end mechanical seal structure for a stepped shaft is an improved mechanical seal design. It installs the dynamic ring assembly and the static ring assembly by setting steps with different diameters on the shaft, thus achieving a more complex and reliable sealing effect. This design can adapt to higher pressure and speed requirements and is more convenient for maintenance and replacement. Summary of the Invention

[0004] The single - end mechanical seal structure for a stepped shaft of the utility model provides higher sealing performance and better adaptability through optimized component layout and fixing methods, and is especially suitable for demanding industrial applications.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A single - end mechanical seal structure for a stepped shaft, including a stepped shaft, characterized in that it includes a dynamic ring assembly and a static ring assembly;

[0006] The stepped shaft includes a first stepped shaft, a second stepped shaft, and a third stepped shaft; the first stepped shaft, the second stepped shaft, and the third stepped shaft are covered by a sealing cylinder.

[0007] The dynamic ring assembly includes a dynamic ring seat a and a dynamic ring seat b. The dynamic ring seat a is located on the first stepped shaft and rotates with the first stepped shaft. The dynamic ring seat a is installed with a dynamic ring a. The dynamic ring seat b is located on the second stepped shaft and rotates with the second stepped shaft. The dynamic ring seat a is installed with a dynamic ring b;

[0008] The static ring assembly includes a first sealing chamber and a second sealing chamber gland. The first sealing chamber is installed with a spring and a static ring a. The spring presses the static ring a to make the static ring a closely adhere to the dynamic ring a. One end of the second sealing chamber is provided with a spring groove. A small spring is installed in the spring groove. The second sealing chamber is slidably installed with a dynamic ring b. The dynamic ring b is located in front of the small spring and is pressed by the small spring to closely adhere to the dynamic ring seat b. The gland is fixedly connected to the sealing cylinder. The gland is provided with a sealing groove, and a sealing rubber ring is installed in the sealing groove.

[0009] Preferably, the first sealing chamber and the second sealing chamber are formed by the gaps between the inner wall of the sealing cylinder and the outer walls of the first stepped shaft and the second stepped shaft. The first sealing chamber is located behind the second sealing chamber, and the second sealing chamber is located behind the gland.

[0010] Preferably, both the moving ring seat a and the moving ring seat a are provided with mounting holes. The moving ring seat a and the moving ring seat a are respectively fixedly installed on the outer walls of the first stepped shaft and the second stepped shaft through bolts.

[0011] Preferably, the sealing cylinder is provided with a mounting hole.

[0012] Preferably, a single-end mechanical seal structure for a stepped shaft is characterized in that the gland is installed on the third stepped shaft. The gland is provided with fixing holes, and the fixing holes cooperate with the mounting holes so that the gland is fixedly connected to the sealing cylinder through bolts.

[0013] Preferably, the outer wall of the moving ring seat a is provided with a fixing groove, and the fixing groove cooperates with the positioning bolt 1 so that the moving ring seat a is fixedly connected to the moving ring a.

[0014] Preferably, the outer wall of the moving ring seat a is provided with a fixing bolt 1, and the positioning groove 1 cooperates with the fixing bolt 1 so that the moving ring seat b is fixedly connected to the moving ring b.

[0015] Preferably, the first sealing chamber is provided with a fixing bolt 2, and the static ring a is provided with a positioning groove 2. The positioning groove 2 cooperates with the fixing bolt 2 so that the static ring a does not rotate with the first stepped shaft in the first sealing chamber.

[0016] Preferably, one end of the static ring b is provided with a positioning bolt 2, and the positioning bolt 2 passes through the spring groove and contacts the small spring.

[0017] Preferably, a water drainage groove is formed by the gap between the static ring b and the moving ring b. The water drainage groove is provided with a water outlet, and the water flowing into the second sealing chamber is discharged through the water groove.

[0018] Compared with the prior art, the present utility model has the following beneficial effects:

[0019] 1. The moving ring a and the moving ring b are respectively tightly combined with the static ring a and the static ring b. Through the extrusion of the spring and the small spring, the sealing performance of the sealing contact surface is enhanced, effectively preventing the leakage of liquid or gas.

[0020] 2. The setting of the water drainage groove and its water outlet allows any moisture entering the second sealing chamber to be quickly discharged, reducing the erosion and pressure of the moisture on the sealing structure, and further ensuring the reliability of the sealing performance.

[0021] 3. The design of the sealing cylinder based on the stepped shaft and the precise matching of the dynamic ring seat and the static ring seat make the entire mechanical seal structure more compact, saving equipment space and facilitating the miniaturization and integration design of the equipment. Description of the Drawings

[0022] Figure 1 It is a sectional view of the present utility model;

[0023] Figure 2 It is an exploded view of the parts of the present utility model;

[0024] Figure 3 It is a sectional view of the static ring assembly of the present utility model.

[0025] In the figure, 1. Stepped shaft; 101. First stepped shaft; 102. Second stepped shaft; 103. Third stepped shaft; 2. Dynamic ring assembly; 201. Dynamic ring seat a; 202. Dynamic ring seat b; 203. Dynamic ring a; 204. Dynamic ring b; 205. Fixed groove; 206. Positioning bolt 1; 207. Fixing bolt 1; 208. Positioning groove 1; 3. Static ring assembly; 301. Sealing cylinder; 302. First sealing chamber; 303. Second sealing chamber; 304. Gland; 305. Spring; 306. Static ring a; 307. Spring groove; 308. Small spring; 309. Static ring b; 310. Sealing groove; 311. Sealing rubber ring; 312. Mounting hole; 313. Fixing hole; 314. Fixing bolt 2; 315. Positioning groove 2; 316. Positioning bolt 2; 317. Drainage groove. Detailed Implementation Manner

[0026] A stepped shaft single-end face mechanical seal structure includes a stepped shaft 1, and is characterized by including a dynamic ring assembly 2 and a static ring assembly 3;

[0027] The stepped shaft 1 includes a first stepped shaft 101, a second stepped shaft 102, and a third stepped shaft 103; the first stepped shaft 101, the second stepped shaft 102, and the third stepped shaft 103 are all covered by the sealing cylinder 301.

[0028] The moving ring assembly 2 includes a moving ring seat a201 and a moving ring seat b202. The moving ring seat a201 is located on the first stepped shaft 101 and rotates with the first stepped shaft 101. The moving ring seat a201 is installed with a moving ring a203. The moving ring seat b202 is located on the second stepped shaft 102 and rotates with the second stepped shaft 102. The moving ring seat a201 is installed with a moving ring b204. Both the moving ring seat a201 and the moving ring seat b202 are provided with mounting holes, and the moving ring seat a201 and the moving ring seat a201 are respectively fixedly installed on the outer walls of the first stepped shaft 101 and the second stepped shaft 102 through bolts. The inner wall of the moving ring seat a201 is provided with a fixing groove 205, and the outer wall of the moving ring a203 is provided with a positioning bolt 206. The fixing groove 205 cooperates with the positioning bolt 206 to fixedly connect the moving ring seat a201 and the moving ring a203. The inner wall of the moving ring seat a201 is provided with a fixing bolt 207, and the outer wall of the moving ring b204 is provided with a positioning groove 208. The positioning groove 208 cooperates with the fixing bolt 207 to fixedly connect the moving ring seat b202 and the moving ring b204. A drain groove 317 is formed in the gap between the stationary ring b309 and the moving ring b202. The drain groove is provided with a water outlet, and the water flowing into the second sealing chamber 303 is discharged through the water groove 317.

[0029] The stationary ring assembly 3 includes a first sealing chamber 302, a second sealing chamber 303, and a gland 304. The first sealing chamber 302 and the second sealing chamber 303 are formed by the gaps between the inner wall of the sealing cylinder 301 and the outer walls of the first stepped shaft 101 and the second stepped shaft 102. The first sealing chamber 302 is located behind the second sealing chamber 303, and the second sealing chamber 303 is located behind the gland 304. The first sealing chamber 302 is provided with a fixing bolt 314, and the stationary ring a306 is provided with a positioning groove 315. The positioning groove 315 cooperates with the fixing bolt 314 to prevent the stationary ring a306 from rotating with the first stepped shaft 101 in the first sealing chamber 302. A spring 305 is installed in the first sealing chamber 302. The spring 305 presses against the stationary ring a306 to make the stationary ring a306 closely adhere to the moving ring a203. One end of the second sealing chamber 303 is provided with a spring groove 307, and a small spring 308 is installed in the spring groove 307. A stationary ring b309 is slidably installed in the second sealing chamber 303, and the stationary ring b309 is located in front of the small spring 308. One end of the stationary ring b309 is provided with a positioning bolt 316, and the positioning bolt 316 passes through the spring groove 307 and contacts the small spring. The stationary ring b309 is pressed against the moving ring b204 by the small spring 308. The sealing cylinder 301 is provided with a mounting hole 312, and the mounting hole 312 is located above the second sealing chamber 303. The gland 304 is installed on the third stepped shaft 103. The gland 304 is provided with a fixing hole 313, and the fixing hole 313 cooperates with the mounting hole 312 to fixedly connect the gland 304 and the sealing cylinder 301. The gland 304 is provided with a sealing groove 310, and a sealing rubber ring 311 is installed in the sealing groove 310.

Claims

1. A single-end mechanical seal structure for a stepped shaft, comprising a stepped shaft (1), characterized in that, It includes a moving ring assembly (2) and a stationary ring assembly (3); The stepped shaft (1) includes a first stepped shaft (101), a second stepped shaft (102), and a third stepped shaft (103); the first stepped shaft (101), the second stepped shaft (102), and the third stepped shaft (103) are all covered by a sealing cylinder (301); The moving ring assembly (2) includes a moving ring seat a (201) and a moving ring seat b (202). The moving ring seat a (201) is located on the first stepped shaft (101) and rotates with the first stepped shaft (101). The moving ring seat a (201) is installed with a moving ring a (203). The moving ring seat b (202) is located on the second stepped shaft (102) and rotates with the second stepped shaft (102). The moving ring seat a (201) is installed with a moving ring b (204); The stationary ring assembly (3) includes a first sealing chamber (302), a second sealing chamber (303), and a gland (304). The first sealing chamber (302) is installed with a spring (305) and a stationary ring a (306). The spring (305) presses the stationary ring a (306) so that the stationary ring a (306) is in close contact with the moving ring a (203). One end of the second sealing chamber (303) is provided with a spring groove (307). A small spring (308) is installed in the spring groove (307). The second sealing chamber (303) is slidably installed with a stationary ring b (309). The stationary ring b (309) is located in front of the small spring (308) and is pressed by the small spring (308) to be in close contact with the moving ring b (204). The gland (304) is fixedly connected to the sealing cylinder (301). The gland (304) is provided with a sealing groove (310), and a sealing rubber ring (311) is installed in the sealing groove (310).

2. The single-end mechanical seal structure for a stepped shaft according to claim 1, characterized in that, The first sealing chamber (302) and the second sealing chamber (303) are formed by the voids between the inner wall of the sealing cylinder (301) and the outer walls of the first stepped shaft (101) and the second stepped shaft (102). The first sealing chamber (302) is located behind the second sealing chamber (303), and the second sealing chamber (303) is located behind the gland (304).

3. The single-end mechanical seal structure for a stepped shaft according to claim 1, wherein Both the moving ring seat a (201) and the moving ring seat b (202) are provided with mounting holes. The moving ring seat a (201) and the moving ring seat a (201) are respectively fixedly installed on the outer walls of the first stepped shaft (101) and the second stepped shaft (102) through bolts.

4. The single-end mechanical seal structure for a stepped shaft according to claim 1, wherein, The sealing cylinder (301) is provided with a mounting hole (312).

5. The single-end mechanical seal structure of a stepped shaft according to claim 1, characterized in that, The gland (304) is installed on the third stepped shaft (103). The gland (304) is provided with a fixing hole (313). The fixing hole (313) cooperates with the mounting hole (312) so that the gland (304) is fixedly connected to the sealing cylinder (301) through bolts.

6. The single-end mechanical seal structure for a stepped shaft according to claim 1, characterized in that The moving ring seat a (201) is provided with a fixing groove (205). The inner wall of the moving ring a (203) is provided with a positioning bolt 1 (206). The fixing groove (205) cooperates with the positioning bolt 1 (206) to fixedly connect the moving ring seat a (201) and the moving ring a (203).

7. The single-end mechanical seal structure for a stepped shaft according to claim 1, characterized in that, The inner wall of the moving ring seat b (202) is provided with a first fixing bolt (207), and the outer wall of the moving ring b (204) is provided with a first positioning groove (208). The first positioning groove (208) cooperates with the first fixing bolt (207) to fixedly connect the moving ring seat b (202) and the moving ring b (204).

8. The single-end mechanical seal structure for a stepped shaft according to claim 1, wherein The first sealing chamber (302) is provided with a second fixing bolt (314), and the stationary ring a (306) is provided with a second positioning groove (315). The second positioning groove (315) cooperates with the second fixing bolt (314) to prevent the stationary ring a (306) from rotating with the first stepped shaft (101) in the first sealing chamber (302).

9. The single-end mechanical seal structure for a stepped shaft according to claim 1, wherein One end of the stationary ring b (309) is provided with a second positioning bolt (316), and the second positioning bolt (316) assembly is installed in the spring groove (307) and contacts the small spring (308).

10. The single-end mechanical seal structure of a stepped shaft according to claim 1, characterized in that, A water drainage groove (317) is formed in the gap between the stationary ring b (309) and the moving ring b. The water drainage groove is provided with a water outlet, and the water flowing into the second sealing chamber (303) is discharged through the water drainage groove (317).

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