CN115681504A - Moving shaft sealing device for powder electromechanical equipment - Google Patents

Abstract

The invention discloses a movable shaft sealing device for powder electromechanical equipment, which comprises a movable shaft, a box body, a shaft end gland and a sealing shaft sleeve sleeved on the movable shaft, wherein the sealing shaft sleeve is positioned in a sealing seat, one end of the sealing seat can be connected with the box body, the other end of the sealing seat can be connected with the shaft end gland, a floating block assembly is arranged on the sealing shaft sleeve, the floating block assembly comprises a floating block and a guide piece for guiding the floating block, and the floating block can be in sealing fit with the inner wall of the sealing seat under the action of centrifugal force so as to realize the sealing effect. Compared with the prior art, the device has the advantages of good sealing performance, long service life, low use cost, stable device structure performance and reliable operation.

Description

Dynamic shaft sealing device for powder electromechanical equipment

technical field

The invention relates to a moving shaft sealing device for powder electromechanical equipment.

Background technique

Many of the powder electromechanical equipment have a moving shaft sealing device, such as high-speed mixers, coulter mixers, ribbon mixers, rotary valves (air shutoffs), dryers, etc., and the moving shaft sealing devices in these equipments are currently The device generally adopts packing + air-tight structure, the main part of which is stuffing box I, packing III is pressed by stuffing cover II to seal the moving shaft, and there is an air supply hole IV on the stuffing box, through which nitrogen gas is sent in to make the powder No leakage, so as to achieve the sealing effect of the moving shaft, the detailed structure is shown in Figure 1. It can be seen from Fig. 1 that although the existing dynamic shaft sealing device has the characteristics of mature technology and low cost of use, the following problems cannot be avoided in use.

1. Since the axial positioning of the packing is achieved by the axial compression of the end cover, this will cause uneven compression force of the packing in the axial direction, resulting in uneven wear of the packing in the axial direction and the need to pre-tighten the end cover in time , resulting in low packing life, high maintenance or replacement packing frequency, which directly increases the operating cost of the enterprise.

2. The principle of packing seal is to ensure that there is no gap on the mating surface through the tight fit between the packing and the moving shaft. During work, the mating surface between the packing and the moving shaft is constantly friction and worn. During this friction and wear process, the packing chips are continuously discharged, and some of them fall to the Outside the stuffing box, some fall into the equipment, contaminate the materials in the equipment, and make the product unqualified, especially in lithium battery materials, food materials and other industries, this is absolutely prohibited.

3. It becomes very difficult to achieve the design effect through air sealing, because it is necessary to improve the machining accuracy of parts to ensure that the width of the air sealing channel is not uniform along the entire circumferential direction. This method is not only low in production efficiency but also high in production costs. Otherwise, it is difficult to ensure the uniformity of the sealing air pressure along the entire circumferential direction of the air-tight channel width, and there may even be local areas where there is no sealing air pressure at all, which will cause the powder to leak into the moving shaft sealing device, and the powder has not been fundamentally solved. Shaft seal problem.

4. The air-tight structure is adopted. If the gas source is impure or the metal foreign matter produced when the gas pipe joint is tightened will be brought into the equipment by the sealed gas, polluting the materials in the equipment, and the problems generated are the same as the above 2.

5. The air-tight structure is adopted. If the sealing gas is suddenly cut off or the air pressure is insufficient, the powder will leak into the moving shaft sealing device, which will lead to faster wear of the parts in the moving shaft sealing device and reduce the service life of the parts.

6. Packing + air seal structure, the air seal channel is directly connected to the inside of the equipment. If the equipment is connected to the automatic weighing and unloading equipment, in order to prevent the material from entering the dynamic shaft seal, the air seal must be opened first, but this will affect the material of weighing. Also there is the problem that exists in aforementioned 1,2,3 simultaneously.

7. According to the principle of mechanical seal structure, friction and wear will occur during the working process, so that abrasive debris will fall into the equipment and pollute the materials in the equipment. The problems generated are consistent with the above 2.

Therefore, the existing powder electromechanical equipment still has the problem of powder material leakage from the driven shaft. In order to solve the above problems, it is urgent to develop a dynamic shaft sealing device for powder electromechanical equipment.

Contents of the invention

The object of the present invention is to provide a moving shaft sealing device for powder electromechanical equipment with good sealing performance and no powder leakage.

The moving shaft sealing device for powder electromechanical equipment provided by the present invention includes a moving shaft, a box body, and a shaft end gland, and also includes a sealing shaft sleeve, a floating block and a guide groove for guiding the floating block, and the sealing shaft sleeve On the moving shaft and located in a sealing seat, one end of the sealing seat can be connected with the box body, and the other end can be connected with the shaft end gland, the guide groove is directly or indirectly provided on the sealing shaft sleeve, the The floating block can seal and fit with the inner wall of the sealing seat under the action of centrifugal force along the guide groove.

In order to effectively improve the sealing performance, the floating block is in a spiral shape. At least one floating block is used, and the floating block is arranged as a single-head spiral on the sealing shaft sleeve. At least two floating blocks are used, and the floating blocks are arranged as a multi-head spiral on the sealing shaft sleeve. The floating blocks are installed continuously or at intervals.

For the convenience of manufacture, a helical blade is arranged on the sealing shaft sleeve, and a guide groove is arranged on the helical blade. The helical blades are fixed on the sealing bushing through connections. Or the spiral vane and the sealing shaft sleeve are integrated.

In order to further improve the sealing performance, a static ring seal and a dynamic ring seal are provided at the end of the sealing sleeve close to the shaft end gland. The static ring seal has a first ring set, and the dynamic ring seal has a second ring. The first ring set and the second ring set are fitted together, and the moving ring seal is rotatable relative to the static ring seal.

In order to make the powder in the sealing seat return to the box, the inner wall of the sealing seat has a slope on the side of the box, which is used for the powder in the sealing seat to return to the box by gravity. There is an air supply hole on the shaft end gland, which is used to supply air to the sealing seat during maintenance or repair.

In order to facilitate installation, the sealing sleeve is an axial split structure.

In order to timely clean the residual powder on the floating block or on the spiral blade or on the moving ring seal and in the sealing seat, the floating block is provided with a first cleaning hole. A second cleaning hole is designed on the spiral blade. A third cleaning hole is designed on the moving ring seal.

In the present invention, since the moving shaft is covered with a sealing sleeve, and the sealing sleeve is provided with a floating block, when the moving shaft rotates, the floating block fits with the inner wall of the sealing seat under the action of centrifugal force, which plays a very good sealing effect and avoids Compared with the prior art, the present invention has good sealing performance, no pollution, long service life, low cost of use, stable structure and performance of the device, and reliable operation. It can improve the production efficiency of the enterprise and reduce the production and operation costs.

Description of drawings

Fig. 1 is a structural schematic diagram of the prior art.

Fig. 2 is a structural schematic diagram of an embodiment of the present invention.

Fig. 3 is an enlarged view of part A of Fig. 2 .

Fig. 4 is a schematic diagram of the assembly of the sealing bush and the floating block in the present invention.

Fig. 5 is a schematic structural view of the upper half shaft in the sealed bushing of the present invention.

Fig. 6 is a schematic diagram of the structure of the sealing seat in the present invention.

Fig. 7 is a schematic diagram of the structure of the static ring seal in the present invention.

Fig. 8 is a schematic diagram of the structure of the shaft end gland in the present invention.

Fig. 9 is a schematic diagram of the structure of the moving ring seal in the present invention.

Fig. 10 is a schematic diagram of the assembly of the sealing sleeve, the spiral piece and the floating block in another embodiment of the present invention.

Fig. 11 is a schematic diagram of the assembly of the sealing sleeve and the spiral piece in Fig. 10 .

The reference signs of Fig. 2-Fig. 11 are as follows:

Moving axis 1;

Sealing sleeve 2, lower half sleeve 21, upper half sleeve 22, spiral blade 23, first cleaning hole 24, floating block 25, guide groove 26, second cleaning hole 27;

Box 3, sealing seat flange 4,

Seal seat 5, slope 51;

Static ring seal 6, first ring group 61;

Shaft end gland 7, air supply hole 71;

Lock bolt 8,

Dynamic ring seal 9, second ring group 91, third cleaning hole 92

Oil seal 10, circlip 11.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail:

Embodiment 1: Refer to Fig. 2-Fig. 9 for its detailed structure.

From Fig. 2 and Fig. 3, it can be seen that the present invention includes a moving shaft 1, a sealing sleeve 2, a box body 3, a sealing seat flange 4, a sealing seat 5, a static ring seal 6, a shaft end gland 7, and a locking bolt 8. Moving ring seal 9, oil seal 10, elastic retaining ring 11.

One end of the seal seat 5 is detachably fastened to the box body 3 through the seal seat flange 4 , and the other end is fastened to the shaft end gland 7 by the locking bolt 8 via the static ring seal 6 .

The sealing shaft sleeve 2 is located in the sealing seat 5 and sleeved on the moving shaft 1 , and one end stops at the shaft shoulder of the moving shaft 1 , and the other end stops at the moving ring seal 9 .

It can be seen from Fig. 4 and Fig. 5 that the structure of the sealing shaft sleeve 2 and the assembly relationship between the sealing shaft sleeve 2 and the floating fast 25 can be seen. The sealing bushing 2 adopts an axial opening and closing structure. In this embodiment, the sealing bushing 2 has two half bushings, that is, the lower half bushing 21 and the upper half bushing 22. These two half bushings are respectively placed on the The moving shaft 1 is connected with non-metallic material bolts, so that the installation is very convenient. The sealing shaft sleeve 2 is provided with a guide groove 26, which guides the floating block 25. At least one floating block 25 is used. Assembling technology can meet the requirements, and only one floating block 25 can be used. In this case, it is usually relatively easy to install. When the number of sliders 25 is two or more, the sliders 25 can be arranged in a continuous or discontinuous spiral. When the floating block 25 is arranged as a multi-head spiral on the sealing shaft sleeve 2, at least two floating blocks 25 are used. Similarly, when there are multiple floating blocks 25, they can be arranged in a continuous or discontinuous spiral, and in this case, the sealing effect will be very good. When the moving shaft 1 rotates, the floating block 25 adheres to the inner wall of the sealing seat 5 under the action of the centrifugal force, and plays a good sealing effect. The floating block 25 is provided with a first cleaning hole 24 for cleaning the residual powder on the floating block and in the sealing seat 5 .

The sealing seat 5 has a slope 51 on the side of the box body 3, the purpose of which is to make the powder in the sealing seat 5 return to the box body 3 under the action of gravity, so as to prevent the powder from leaking out. See Figure 6.

The dynamic ring seal 9 is fitted with the static ring seal 6, the static ring seal 6 has a first ring set 61, the dynamic ring seal 9 has a second ring set 91, and the first ring set 61 and the second ring set The groups 91 are fitted with each other, and the second ring group 91 can rotate relative to the first ring group 61, mainly for dustproof and sealing functions. The third cleaning hole 92 is also designed on the moving ring seal 9, which mainly plays the role of maintaining and cleaning the residual powder in the sealing seat 5. See Figures 7 and 8.

The shaft end gland 7 is provided with an air supply hole 71 for supplying air to the sealing seat 5 during maintenance and repair, and can blow the leaked powder into the box body 3 . Ease of maintenance is ensured. See Figure 9.

When installing, first install the floating fast 25 into the guide groove 26, then lock the sealing seat 5, the sealing seat flange 4 and the box body 3 with bolts, and then install the sealing sleeve 2 on the moving shaft 1 to form an assembly into the box On the body 3, the static ring seal 6 passes through the outer circle of the seal shaft sleeve 2 and cooperates with the end face of the seal seat 5; then the dynamic ring seal 9 is installed on the dynamic shaft 1, and the elastic retaining ring 11 is installed to axially fix the dynamic ring seal Part 9, sealing shaft sleeve 2; finally put the oil seal 10 into the shaft end gland 7, cooperate with the end face of the static ring seal 6 as a whole, and use the bolt 8 to connect the static ring seal 6, the shaft end gland 7 and the sealing seat 5 lock. Finally, a complete dynamic shaft sealing device is formed. See Figure 2 for details.

The working principle of the present invention is:

1. When the equipment is working, the floating block 25 on the sealing shaft sleeve 2 fits with the inner hole of the sealing seat 5 under the action of centrifugal force to play a sealing role. The sealing shaft sleeve 2 is the first seal of the entire dynamic shaft sealing device, and plays a major sealing role.

2. When the equipment is working, if any powder leaks into the sealing seat 5, its slope 51 will use the gravity of the powder to push the powder leaked into the sealing seat 5 into the box 3, for The second seal of the entire moving shaft sealing device.

3. When the equipment is working, if powder leaks to the static ring seal 6, the first ring group 61 of the static ring seal and the second ring group 91 of the dynamic ring seal 9 will block the leaked powder here , to prevent the powder from leaking out of the equipment and polluting the environment. The dynamic ring seal 9 and the static ring seal 6 form the third seal of the entire dynamic shaft sealing device.

4. During equipment maintenance, if powder leaks into the sealing seat 5, use an external air source to connect the air supply hole 71 on the shaft end gland 7 to blow the leaked powder into the box 3. Ease of maintenance is ensured.

5. When maintaining the equipment, first remove the locking bolt 8, then disassemble the shaft end gland 7, the dynamic ring seal 9, and the static ring seal 6 in the direction away from the box body 3, and finally replace the oil seal 10 and the sealing sleeve 2 and other vulnerable parts. After replacement, assemble in reverse order of disassembly. Ease of maintenance is guaranteed.

Embodiment 2: Combining Figure 10-Figure 11.

The main difference between this embodiment and the first embodiment is that the helical blade 23 is added. The helical blade 23 can be processed separately and installed on the sealing sleeve 2, or the sealing sleeve 2 with the helical blade 23 can be processed as a whole. The slot 26 is provided on the helical blade 23, and the floating block 25 is installed on the helical blade 23 through the guide slot 26, see FIG. 10 . It can be seen from FIG. 11 that the sealing sleeve 2 can also adopt an axial opening and closing structure, so as to facilitate installation. During operation, the floating block 25 slides along the guide groove 26 under the action of the centrifugal force and fits and seals with the inner wall of the sealing seat. Similarly, one or more sliders 25 can be used, and can be arranged continuously or intermittently on the helical blades. The helical blade 23 can be single-headed or multi-headed, and the helical blade 23 is provided with a second cleaning hole 27 for cleaning the powder on the helical blade. In this embodiment, the sealing effect is relatively easy to be guaranteed.

It can be seen from the above embodiments that the present invention can effectively prevent the leakage of the sealed powder, and avoid the problems existing in the existing sealing structure or device, such as the sealing function in the prior art is easily damaged, the seal is easy to wear, pollutes the product, uses The life is too short, the reliability is low, and the use cost is high. The invention can improve the production efficiency of the enterprise and reduce the production and operation costs.

Claims (17)

1. A moving shaft sealing device for powder electromechanical equipment, comprising a moving shaft (1), a casing (3), and a shaft end gland (7), characterized in that the device also includes a sealing sleeve (2) , the floating block (25) and the guide groove (26) for the guiding of the floating block, the sealing sleeve (2) is sleeved on the moving shaft and is located in a sealing seat (5), and one end of the sealing seat can be connected with the casing (3) connection, the other end can be connected with the shaft end gland (7), the guide groove is directly or indirectly arranged on the sealing bushing (2), and the floating block is moved along the guide groove (26) under the action of centrifugal force It can seal fit with the inner wall of the sealing seat. 2. The moving shaft sealing device for powder electromechanical equipment according to claim 1, characterized in that the floating block (25) is in a spiral shape. 3. The moving shaft sealing device for powder electromechanical equipment according to claim 1 or 2, characterized in that at least one floating block (25) is used, and the floating block is a single head on the sealing sleeve (2). Spiral arrangement. 4. The moving shaft sealing device for powder electromechanical equipment according to claim 3, characterized in that there are several floating blocks (25), and the floating blocks are installed continuously or at intervals. 5. The moving shaft sealing device for powder electromechanical equipment according to claim 1 or 2, characterized in that at least two floating blocks (25) are used, and the floating blocks are multi-headed on the sealing sleeve (2) Spiral arrangement. 6. The moving shaft sealing device for powder electromechanical equipment according to claim 5, characterized in that there are several floating blocks (25), and the floating blocks are installed continuously or at intervals. 7. The moving shaft sealing device for powder electromechanical equipment according to claim 1 or 2, characterized in that the sealing sleeve (2) is provided with a helical blade, and the guide groove is arranged on the helical blade (23) . 8. The moving shaft sealing device for powder electromechanical equipment according to claim 7, characterized in that the helical blade (23) is fixed on the sealing sleeve (2) through connection. 9. The moving shaft sealing device for powder electromechanical equipment according to claim 7, characterized in that the helical blade (23) and the sealing sleeve (2) are integrated. 10. The moving shaft sealing device for powder electromechanical equipment according to claim 1 or 2, characterized in that a static ring seal (6) is provided at the end of the sealing sleeve (2) close to the shaft end gland (7) ) and a dynamic ring seal (9), the static ring seal has a first ring set (61), the dynamic ring seal (9) has a second ring set (91), and the first ring set (61 ) and the second ring group (91) are fitted together, and the moving ring seal (9) is rotatable relative to the static ring seal (6). 11. The moving shaft sealing device for powder electromechanical equipment according to claim 3, characterized in that a static ring seal (6) and The dynamic ring seal (9), the static ring seal has a first ring group (61), the dynamic ring seal (9) has a second ring group (91), and the first ring group (61) and The second ring group (91) is fitted with each other, and the moving ring seal (9) is rotatable relative to the static ring seal (6). 12. The moving shaft sealing device for powder electromechanical equipment according to claim 5, characterized in that a static ring seal (6) and The dynamic ring seal (9), the static ring seal has a first ring group (61), the dynamic ring seal (9) has a second ring group (91), and the first ring group (61) and The second ring group (91) is fitted with each other, and the moving ring seal (9) is rotatable relative to the static ring seal (6). 13. The dynamic shaft sealing device for powder electromechanical equipment according to claim 7, characterized in that a static ring seal ( 6) and the dynamic ring seal (9), the static ring seal has a first ring group (61), the dynamic ring seal (9) has a second ring group (91), and the first ring group ( 61) is fitted with the second ring group (91), and the moving ring seal (9) is rotatable relative to the static ring seal (6). 14. The moving shaft sealing device for powder electromechanical equipment according to claim 1 or 2, characterized in that the inner wall of the sealing seat (5) has a slope (51) on the side of the box body, which is used for sealing the powder in the seat due to Gravity returns to the box by itself. 15. The moving shaft sealing device for powder electromechanical equipment according to claim 3, characterized in that the inner wall of the sealing seat (5) has a slope (51) on the side of the box body, which is used for the powder in the sealing seat to move itself due to gravity. Back inside the box. 16. The moving shaft sealing device for powder electromechanical equipment according to claim 5, characterized in that the inner wall of the sealing seat (5) has a slope (51) on the side of the box body, which is used for the powder in the sealing seat to move itself due to gravity. Back inside the box. 17. The moving shaft sealing device for powder electromechanical equipment according to claim 7, characterized in that the inner wall of the sealing seat (5) has a slope (51) on the side of the box body, which is used for the powder in the sealing seat to move itself due to gravity. Back inside the box.

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