Mechanical sealing device of top stirring equipment

Abstract

The utility model provides a mechanical sealing device of top stirring equipment. The mechanical sealing device comprises an equipment shaft, the equipment shaft is sleeved with a shaft sleeve, an upper static ring seat and a lower static ring seat are arranged on the upper side and the lower side of the shaft sleeve respectively, an upper static ring is arranged in the upper static ring seat, an upper spring box is arranged on the shaft sleeve, and an upper movable ring and a first spring are arranged in the upper spring box; a lower moving ring is arranged on the shaft sleeve, and a lower static ring and a second spring are arranged in the lower static ring seat. The mechanical sealing device of the top stirring equipment is good in cleaning and sterilizing effect and low in medium residue; a plurality of crescent grooves are formed in an inner hole in the end face of the lower static ring, and by means of the liquid storage function of the crescent grooves, the sealing end face lubricating effect is achieved in the non-pressure blocking sealing liquid state when blocking sealing liquid is intermittently supplied for 2-3 seconds, the dry grinding phenomenon of the mechanical seal is reduced, meanwhile, the service life of the mechanical seal is prolonged, and the dry grinding noise of the mechanical seal end face is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a mechanical seal device for a top stirring equipment. Background Technology

[0002] Mechanical seals, also known as face seals, are a widely used type of rotary shaft seal. In a mechanical seal, the two annular parts that are in contact and slide relative to each other are called sealing rings. The sealing ring that rotates with the shaft is called the moving ring or rotating ring, while the sealing ring that does not rotate with the shaft is called the stationary ring. The end faces where the two sealing rings are in contact are called sealing end faces. A mechanical seal consisting of a pair of end faces is called a single-end-face seal.

[0003] In the food and pharmaceutical industries, there are often special requirements for mechanical seals used in various equipment. For example, during the production process, steam sterilization and cleaning require that there be no dead corners or residues on the parts that come into contact with the materials. Another example is that some processes require that the sealing fluid be supplied intermittently, that is, the sealing fluid is drained every 2-5 minutes and new sealing fluid is supplied at the same time, during which there will be a 2-3 second period of pressureless sealing fluid.

[0004] Existing mechanical seals have drawbacks such as residues left during sterilization, dry running due to lack of sealant, whistling, short lifespan, and reduced reliability. Utility Model Content

[0005] In response to the technical problems mentioned in the background art, this utility model provides a mechanical seal device for a top stirring device.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This utility model provides a mechanical seal device for a top stirring device. The mechanical seal device includes a device shaft, on which a bushing is fitted. An upper stationary ring seat and a lower stationary ring seat are respectively provided on the upper and lower sides of the bushing. An upper stationary ring is provided in the upper stationary ring seat. An upper spring box is provided on the bushing. An upper moving ring and a first spring are provided in the upper spring box. Under the action of the first spring, the end face of the upper moving ring and the end face of the upper stationary ring are in contact.

[0008] The bushing is provided with a lower moving ring, and the lower stationary ring seat is provided with a lower stationary ring and a second spring. Under the action of the second spring, the end face of the lower moving ring is in contact with the end face of the lower stationary ring.

[0009] Preferably, the inner hole of the lower stationary ring end face is provided with a plurality of crescent grooves, and the crescent grooves have upstream pumping function and liquid storage function.

[0010] Preferably, the lower stationary ring seat is provided with a sealing liquid inlet, and the upper stationary ring seat is provided with a sealing liquid outlet.

[0011] Preferably, a flow guide sleeve is provided on the lower stationary ring seat, and the flow guide sleeve connects the lower moving ring and the lower stationary ring.

[0012] Preferably, a bushing seal ring is provided between the device shaft and the bushing.

[0013] Preferably, the lower stationary ring seat is fixed to the equipment base by bolts, and a lower stationary ring seat sealing ring is provided between the lower stationary ring seat and the equipment base.

[0014] Preferably, a lower moving ring sealing ring is provided between the lower moving ring and the bushing.

[0015] Preferably, the sealing fluid outlet is connected to one end of the mechanical seal cooling system, and the other end of the mechanical seal cooling system is connected to the sealing fluid inlet.

[0016] The positive and progressive effects of this utility model are as follows: This utility model provides a mechanical seal device for a top-mixing equipment. The mechanical seal device includes a shaft, on which a bushing is fitted. An upper stationary ring seat and a lower stationary ring seat are respectively provided on the upper and lower sides of the bushing. An upper stationary ring is housed in the upper stationary ring seat. An upper spring box is provided on the bushing, containing an upper moving ring and a first spring. Under the action of the first spring, the end faces of the upper moving ring and the upper stationary ring are in contact. A lower moving ring is provided on the bushing, and a lower stationary ring seat contains a lower stationary ring and a second spring. Under the action of the second spring, the end faces of the lower moving ring and the lower stationary ring are in contact. The mechanical seal device of this utility model for top-mixing equipment has good cleaning and sterilization effects and low media residue. By opening several crescent-shaped grooves in the inner hole of the lower stationary ring end face, the liquid storage function of the crescent-shaped grooves provides lubrication to the sealing end face during the 2-3 seconds of pressureless sealing liquid state during intermittent supply of sealing liquid, reducing the dry friction phenomenon of the mechanical seal, improving the mechanical seal life, and reducing the dry friction noise of the mechanical seal end face. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the mechanical seal device of the top stirring equipment of this utility model.

[0018] Figure 2 This is a schematic diagram of the crescent groove structure on the lower stationary ring end face of this utility model.

[0019] Legend: 1. Equipment shaft; 2. Shaft sleeve; 3. Upper stationary ring seat; 4. Lower stationary ring seat; 5. Upper stationary ring; 6. Upper spring box; 7. Upper moving ring; 8. First spring; 9. Lower moving ring; 10. Lower stationary ring; 11. Second spring; 12. Shaft sleeve seal ring; 13. Equipment base; 14. Lower stationary ring seat seal ring; 15. Lower moving ring seal ring; 16. Crescent groove; 17. Sealing fluid inlet; 18. Sealing fluid outlet; 19. Guide sleeve; 20. Bolt. Detailed Implementation

[0020] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0021] Example 1

[0022] like Figure 1-2 As shown, this embodiment provides a mechanical seal device for a top-stirring device. The mechanical seal device includes a shaft 1, a bushing 2, an upper stationary ring seat 3, a lower stationary ring seat 4, an upper stationary ring 5, an upper spring box 6, an upper moving ring 7, a first spring 8, a lower moving ring 9, a lower stationary ring 10, and a second spring 11. The shaft 1 is fitted with a bushing 2. An upper stationary ring seat 3 and a lower stationary ring seat 4 are respectively provided on the upper and lower sides of the bushing 2. An upper stationary ring 5 is disposed in the upper stationary ring seat 3. An upper spring box 6 is provided on the bushing 2, containing an upper moving ring 7 and a first spring 8. Under the action of the first spring 8, the end face of the upper moving ring 7 and the end face of the upper stationary ring 5 are in contact. A lower moving ring 9 is provided on the bushing 2. A lower stationary ring 10 and a second spring 11 are disposed in the lower stationary ring seat 4. Under the action of the second spring 11, the end face of the lower moving ring 9 and the end face of the lower stationary ring 10 are in contact.

[0023] In this embodiment, a bushing seal 12 is provided between the equipment shaft 1 and the bushing 2, the lower stationary ring seat 4 is fixed to the equipment base 13 by bolts 20, and a lower stationary ring seat seal 14 is provided between the lower stationary ring seat 4 and the equipment base 13; a lower moving ring seal 15 is provided between the lower moving ring 9 and the bushing 2.

[0024] In this embodiment, a plurality of crescent grooves 16 are formed in the inner hole of the end face of the lower stationary ring 10. The crescent grooves 16 have upstream pumping and liquid storage functions. Specifically, a varying number of crescent grooves 16 are formed in the inner hole of the end face of the lower stationary ring 10. The size and number of the crescent grooves 16 are determined through calculation and experimentation. The crescent grooves 16 have an upstream pumping function, meaning that when the equipment shaft 1 rotates, the sealing fluid can be forcibly introduced into the sealing end face, enhancing the lubrication effect of the sealing end face. The crescent grooves 16 also have a liquid storage function, providing lubrication to the sealing end face during the 2-3 seconds of pressureless sealing fluid state during the intermittent supply of the sealing fluid, reducing the dry friction phenomenon of the mechanical seal, improving the mechanical seal life, and reducing the dry friction noise of the mechanical seal end face.

[0025] In this embodiment, a sealing fluid inlet 17 is provided on the lower stationary ring seat 4, and a sealing fluid outlet 18 is provided on the upper stationary ring seat 3; a guide sleeve 19 is provided on the lower stationary ring seat 4, and the guide sleeve 19 connects the lower moving ring 9 and the lower stationary ring 10; the sealing fluid outlet 18 is connected to one end of the mechanical seal cooling system, and the other end of the mechanical seal cooling system is connected to the sealing fluid inlet 17. Specifically, in order to prevent the liquid inside the equipment from flowing out, a sealing fluid is used in the double-ended sealing cavity. The pressure of the sealing fluid is higher than the pressure of the equipment sealing cavity. The sealing fluid enters the cavity formed by the inner hole of the lower stationary ring seat 4 and the outer circle of the bushing 2 through the sealing fluid inlet 17 on the lower stationary ring seat 4, and flows into the sealing end faces of the lower moving ring 9 and the lower stationary ring 10 through the guide sleeve 19 to lubricate the sealing end faces. Then, it flows up through the crescent groove 16 of the inner hole of the lower stationary ring 10 to the sealing fluid outlet 18 on the upper stationary ring seat 3 and flows out into the externally installed mechanical seal cooling system. After being cooled by the mechanical seal cooling system, it enters the lower stationary ring seat 4 again through the sealing fluid inlet 17 and repeats the cycle.

[0026] This embodiment provides a mechanical seal device for a top-stirring device. The mechanical seal device of this embodiment exhibits good cleaning and sterilization effects with low media residue. By providing several crescent-shaped grooves within the inner hole of the lower stationary ring end face, the grooves' liquid storage function lubricates the sealing end face during the 2-3 seconds of pressureless sealing liquid state during intermittent supply of the sealing liquid. This reduces dry friction of the mechanical seal, improves its lifespan, and reduces dry friction noise at the mechanical seal end face.

[0027] The working principle of this utility model is as follows: the sealing fluid enters the cavity formed by the inner hole of the lower stationary ring seat 4 and the outer circle of the bushing 2 through the sealing fluid inlet 17 on the lower stationary ring seat 4. When the equipment shaft 1 rotates, the sealing fluid flows through the guide sleeve 19 into the sealing end faces of the lower moving ring 9 and the lower stationary ring 10 to lubricate the sealing end faces. Then, it flows upward through the crescent groove 16 in the inner hole of the lower stationary ring 10 end face to the sealing fluid outlet 18 on the upper stationary ring seat 3 and flows out, entering the externally installed mechanical seal cooling system. After being cooled by the mechanical seal cooling system, it enters the lower stationary ring seat 4 again through the sealing fluid inlet 17, and the cycle repeats.

[0028] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A mechanical seal device for a top stirrer apparatus, characterized in that The mechanical seal device comprises a device shaft, a shaft sleeve sleeved on the device shaft, an upper static ring seat and a lower static ring seat respectively arranged on the upper and lower sides of the shaft sleeve, an upper static ring arranged in the upper static ring seat, an upper spring box arranged on the shaft sleeve, an upper dynamic ring and a first spring arranged in the upper spring box, and an upper dynamic ring end face and an upper static ring end face adhered under the action of the first spring; A lower dynamic ring is arranged on the shaft sleeve, a lower static ring and a second spring are arranged in the lower static ring seat, and a lower dynamic ring end face and a lower static ring end face are adhered under the action of the second spring.

2. The mechanical seal device for a top stirrer apparatus according to claim 1, characterized in that, A plurality of crescent grooves are arranged in the lower static ring end face inner hole, and the crescent grooves have upstream pumping function and liquid storage function.

3. The mechanical seal apparatus for a top stir device as claimed in claim 2, wherein A blocking liquid inlet is arranged on the lower static ring seat, and a blocking liquid outlet is arranged on the upper static ring seat.

4. The mechanical seal apparatus for a top stir device as claimed in claim 1, wherein A flow guide sleeve is arranged on the lower static ring seat, and the flow guide sleeve is connected with the lower dynamic ring and the lower static ring.

5. The mechanical seal device for a top stirrer apparatus according to claim 4, characterized in that A shaft sleeve sealing ring is arranged between the device shaft and the shaft sleeve.

6. The mechanical seal apparatus for a top stir device as claimed in claim 5, wherein The lower static ring seat is fixed on a device base by bolts, and a lower static ring seat sealing ring is arranged between the lower static ring seat and the device base.

7. The mechanical seal apparatus for a top stir device as claimed in claim 6, wherein A lower dynamic ring sealing ring is arranged between the lower dynamic ring and the shaft sleeve.

8. The mechanical seal apparatus for a top stir device as claimed in claim 3, wherein The blocking liquid outlet is connected with one end of a mechanical seal cooling system, and the other end of the mechanical seal cooling system is connected with the blocking liquid inlet.

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