CN210715245U - Shaft seal device of pump - Google Patents

Shaft seal device of pump Download PDF

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Publication number
CN210715245U
CN210715245U CN201921688790.1U CN201921688790U CN210715245U CN 210715245 U CN210715245 U CN 210715245U CN 201921688790 U CN201921688790 U CN 201921688790U CN 210715245 U CN210715245 U CN 210715245U
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CN
China
Prior art keywords
pump shaft
sleeve
shaft
pump
sliding sleeve
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CN201921688790.1U
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Chinese (zh)
Inventor
罗潜
黄涛
龙小平
林玉华
秦媛
郑镇�
郭平昌
陈敏
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Hubei Pump Works
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Hubei Pump Works
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Priority to CN201921688790.1U priority Critical patent/CN210715245U/en
Application granted granted Critical
Publication of CN210715245U publication Critical patent/CN210715245U/en
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Abstract

A shaft seal device of a pump comprises a packing layer filled between an end cover and a pump shaft, wherein a pushing sliding sleeve is sleeved outside the pump shaft and comprises a straight cylinder section and a reducing section, the straight cylinder section is inserted between the packing layer and the pump shaft, the thickness of the reducing section is gradually reduced outwards from the axis of the pushing sliding sleeve, and the outer side surface of the reducing section is of an inclined plane structure; a ball body is arranged at one end, close to the reducing section, of the pushing sliding sleeve, the ball body is connected with the clamping sleeve through a spring, the moving direction of the spring is perpendicular to the axis of the pump shaft, and the clamping sleeve is fixed on the pump shaft; the pushing sliding sleeve is in sliding connection with the pump shaft, and the ball body is matched with the pushing sliding sleeve. The utility model discloses can compromise and solve the pump under operation and two kinds of states of stopping, can both play well sealed effect that reduces the running friction simultaneously.

Description

Shaft seal device of pump
Technical Field
The utility model belongs to the sealing device field of pump, in particular to shaft seal device of pump.
Background
Shaft seals include packing seals, mechanical seals, dynamic seals, floating seals, spiral seals, and the like. The shaft seal of the pump can control the leakage of fluid in the pump, and the sealing commonly used at present is dynamic sealing, so-called dynamic sealing, and the working principle of the dynamic sealing is as follows: when the centrifugal pump operates, the working impeller and the auxiliary impeller which plays a role in sealing rotate coaxially, liquid leaked from the working impeller flows to the auxiliary impeller, and pressure generated by the action of the auxiliary impeller and pressure of the leaked liquid are balanced at the top end of the auxiliary impeller and the inner end face of the sealing assembly, so that the leaked liquid plays a role in sealing.
When the pump is stopped, the power seal of the auxiliary impeller does not work, other sealing modes such as mechanical compression are adopted for sealing, but the sealing mode generates large pre-tightening force, becomes large resistance when the pump rotates, consumes energy and generates abrasion.
In the field of dynamic sealing, many people have made corresponding studies, for example, the "high-efficiency auxiliary impeller dynamic sealing structure of a centrifugal pump" described in chinese patent document CN201963584U, but still cannot simultaneously solve the problem that the pump can achieve good sealing effect and reduce running friction in both running and stopping states.
Disclosure of Invention
In view of the technical problem that the background art exists, the utility model provides a shaft seal device of pump can compromise and solve the pump under operation and stop two kinds of states, can both play well sealed effect that reduces running friction simultaneously.
In order to solve the technical problem, the utility model discloses following technical scheme has been taken and has been realized:
a shaft seal device of a pump comprises a packing layer filled between an end cover and a pump shaft, wherein a pushing sliding sleeve is sleeved outside the pump shaft and comprises a straight cylinder section and a reducing section, the straight cylinder section is inserted between the packing layer and the pump shaft, the thickness of the reducing section is gradually reduced outwards from the axis of the pushing sliding sleeve, and the outer side surface of the reducing section is of an inclined plane structure; a ball body is arranged at one end, close to the reducing section, of the pushing sliding sleeve, the ball body is connected with the clamping sleeve through a spring, the moving direction of the spring is perpendicular to the axis of the pump shaft, and the clamping sleeve is fixed on the pump shaft; the pushing sliding sleeve is in sliding connection with the pump shaft, and the ball body is matched with the pushing sliding sleeve.
In a preferable scheme, the number of the balls and the springs is multiple, and the multiple groups of balls and springs are annularly arranged around the axis of the pump shaft.
In a preferred scheme, the number of the balls and the springs is one group.
In the preferred scheme, the section of the cutting sleeve is in an inverted J shape, one end of the spring is connected with the concave end at the top of the cutting sleeve, and the other end of the spring is connected with the ball body; the clearance between the end of the cutting sleeve J shape and the pump shaft is used for pushing the sliding sleeve to move.
In a preferable scheme, a first O-shaped ring is arranged between the pushing sliding sleeve and the pump shaft.
In a preferable scheme, when the pump shaft stops, the ball body is in contact with the outer side face of the reducing section, and the spring is in a compressed state; when the pump shaft rotates, the ball body is separated from the outer side face of the reducer section.
In the preferred scheme, a shaft sleeve is fixedly arranged outside the pump shaft, a clamping sleeve is fixed on the shaft sleeve, and the pushing sliding sleeve is in sliding connection with the pump shaft.
In a preferable scheme, the shaft sleeve comprises a first shaft sleeve and a second shaft sleeve, and a second O-shaped ring is arranged at the junction of the first shaft sleeve and the second shaft sleeve.
This patent can reach following beneficial effect:
the utility model provides a sealing device can realize that the pump during operation leans on power to realize sealing, leans on spring and spheroid to compress tightly the packing layer when shutting down and realizes sealing. The pretightening force for pressing the packing layer can be automatically released when the pump operates. The traditional sealing device is omitted, the sealing of the end sealing of the artificial adjusting shaft is needed, and the effect of good sealing and running friction reduction can be achieved under the two states of running and stopping of the pump.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a partial sectional view of the present invention in example 1, in which only the upper half of the pump shaft is shown;
FIG. 2 is a sectional view of the pushing sliding sleeve of the present invention;
fig. 3 is a partial sectional view of the present invention according to embodiment 2, in which only the upper half of the pump shaft is shown.
In the figure: the pump comprises a cutting sleeve 1, a spring 2, a ball body 3, a pushing sliding sleeve 4, a straight cylinder section 41, a reducing section 42, a packing layer 5, a first O-shaped ring 61, a second O-shaped ring 62, an auxiliary impeller 7, a pump shaft 8, an end cover 9, a first shaft sleeve 11 and a second shaft sleeve 12.
Detailed Description
Example 1:
a preferable scheme is as shown in fig. 1 and fig. 2, the shaft sealing device of the pump comprises a packing layer 5 filled between an end cover 9 and a pump shaft 8, a pushing sliding sleeve 4 is sleeved outside the pump shaft 8, the pushing sliding sleeve 4 comprises a straight cylinder section 41 and a diameter-changing section 42, the straight cylinder section 41 is inserted between the packing layer 5 and the pump shaft 8, the thickness of the diameter-changing section 42 is gradually reduced from the axis of the pushing sliding sleeve 4 to the outside, and the outer side surface of the diameter-changing section 42 is of an inclined surface structure; a ball body 3 is arranged at one end, close to the reducing section 42, of the pushing sliding sleeve 4, the ball body 3 is connected with the cutting sleeve 1 through a spring 2, the moving direction of the spring 2 is perpendicular to the axis of the pump shaft 8, and the cutting sleeve 1 is fixed on the pump shaft 8; the pushing sliding sleeve 4 is in sliding connection with the pump shaft 8, and the ball 3 is matched with the pushing sliding sleeve 4.
The ball 3 is a steel ball, the ball 3 is welded on the spring 2, the spring 2 is welded on the cutting sleeve 1, the outer side inclined plane of the reducing section 42 and the inner wall of the cutting sleeve 1 form a V-shaped space, the ball 3 is positioned in the V-shaped space, when the pump shaft 8 rotates, the ball 3 can further compress the spring 2 under the action of centrifugal force, so that the ball 3 is separated from the pushing sliding sleeve 4, the pressure for pushing the sliding sleeve 4 to extrude the packing layer 5 is reduced, the resistance for rotating the pump is automatically reduced, and the pump completes dynamic sealing through the auxiliary impeller 7; when the pump shaft 8 stopped, the power seal did not work, spheroid 3 received the thrust of spring 2 to the extrusion promotes sliding sleeve 4, promotes sliding sleeve 4 and compresses tightly packing layer 5, thereby reaches sealed effect. It should be noted here that the ferrule 1 rotates with the pump shaft 8, and the pushing sleeve 4 and the pump shaft 8 move relatively to each other. The shrinkage allowance of the packing layer 5 is small, and when the pump shaft 8 rotates, the distance for pushing the sliding sleeve 4 to move is also fine.
Further, the number of the balls 3 and the springs 2 is multiple, and the multiple groups of the balls 3 and the springs 2 are annularly arranged around the axis of the pump shaft 8.
Further, the number of the balls 3 and the springs 2 is 8-16 groups. Preferably 12 groups.
Furthermore, the section of the cutting sleeve 1 is in an inverted J shape, one end of the spring 2 is connected with the concave end at the top of the cutting sleeve 1, and the other end of the spring 2 is connected with the ball 3; the clearance between the end part of the cutting sleeve 1J shape and the pump shaft 8 is used for pushing the sliding sleeve 4 to move.
Further, a first O-shaped ring 61 is arranged between the pushing sliding sleeve 4 and the pump shaft 8. The first O-shaped ring 61 mainly plays a role in sealing, the first O-shaped ring 61 is clamped between the pushing sliding sleeve 4 and the pump shaft 8, and annular grooves for placing the first O-shaped ring 61 are formed in the outer walls of the pushing sliding sleeve 4 and the pump shaft 8.
Further, when the pump shaft 8 stops, the ball 3 contacts with the outer side surface of the reducing section 42, and the spring 2 is in a compressed state; when the pump shaft 8 rotates, the ball 3 is separated from the outer side surface of the reducer section 42.
Example 2:
on the basis of example 1, the following is described in a further embodiment:
the preferred scheme is as shown in fig. 3, a shaft sleeve is fixedly arranged outside the pump shaft 8, the cutting sleeve 1 is fixed on the shaft sleeve, and the pushing sliding sleeve 4 is in sliding connection with the pump shaft 8.
Further, the shaft sleeve comprises a first shaft sleeve 11 and a second shaft sleeve 12, and a second O-ring 62 is arranged at the junction of the first shaft sleeve 11 and the second shaft sleeve 12.
When the medium conveyed by the pump body is a high-temperature medium, in order to protect the pump shaft 8, a shaft sleeve is arranged outside the pump shaft 8 for protection, and the scheme is a current common mode; in this embodiment, the principle of the shaft seal is the same as that of embodiment 1. The shaft sleeves are generally connected in a segmented mode, and a second O-shaped ring 62 is arranged at the boundary of each shaft sleeve, so that conveyed media can be prevented from leaking between the shaft sleeves and the pump shaft 8.
The working principle of the whole device is as follows:
when the pump is stopped, the ball 3 is pushed by the spring 2 to compress the packing layer 5 to play a sealing role. When the pump rotates, the auxiliary impeller 7 plays a role in sealing, and the packing layer 5 is loosened. When the pump stops working, the auxiliary impeller 7 loses the sealing function, and the packing layer 5 is compacted.

Claims (8)

1. A shaft seal device of a pump includes a packing layer (5) filled between an end cover (9) and a pump shaft (8), characterized in that: the pushing sliding sleeve (4) is sleeved outside the pump shaft (8), the pushing sliding sleeve (4) comprises a straight cylinder section (41) and a reducing section (42), the straight cylinder section (41) is plugged between the packing layer (5) and the pump shaft (8), the thickness of the reducing section (42) is gradually reduced outwards from the axis of the pushing sliding sleeve (4), and the outer side surface of the reducing section (42) is of an inclined plane structure; one end, close to the reducing section (42), of the pushing sliding sleeve (4) is provided with a ball body (3), the ball body (3) is connected with the clamping sleeve (1) through a spring (2), the moving direction of the spring (2) is perpendicular to the axis of the pump shaft (8), and the clamping sleeve (1) is fixed on the pump shaft (8); the pushing sliding sleeve (4) is in sliding connection with the pump shaft (8), and the ball body (3) is matched with the pushing sliding sleeve (4).
2. The pump shaft seal assembly according to claim 1, wherein: the quantity of the spheres (3) and the springs (2) is multiple, and the multiple groups of spheres (3) and the springs (2) are annularly arranged around the axis of the pump shaft (8).
3. The pump shaft seal apparatus according to claim 2, wherein: the number of the balls (3) and the springs (2) is 8-16 groups.
4. The pump shaft sealing apparatus according to any one of claims 1 to 3, wherein: the section of the cutting sleeve (1) is in an inverted J shape, one end of the spring (2) is connected with the concave end at the top of the cutting sleeve (1), and the other end of the spring (2) is connected with the ball body (3); a gap between the J-shaped end part of the cutting sleeve (1) and the pump shaft (8) is used for pushing the sliding sleeve (4) to move.
5. The pump shaft seal assembly according to claim 1, wherein: a first O-shaped ring (61) is arranged between the pushing sliding sleeve (4) and the pump shaft (8).
6. The pump shaft seal assembly according to claim 1, wherein: when the pump shaft (8) stops, the ball body (3) is in contact with the outer side face of the reducing section (42), and the spring (2) is in a compressed state; when the pump shaft (8) rotates, the sphere (3) is separated from the outer side face of the reducing section (42).
7. The pump shaft seal assembly according to claim 1, wherein: a shaft sleeve is fixedly arranged outside the pump shaft (8), the clamping sleeve (1) is fixed on the shaft sleeve, and the pushing sliding sleeve (4) is in sliding connection with the pump shaft (8).
8. The pump shaft seal assembly according to claim 7, wherein: the shaft sleeve comprises a first shaft sleeve (11) and a second shaft sleeve (12), and a second O-shaped ring (62) is arranged at the junction of the first shaft sleeve (11) and the second shaft sleeve (12).
CN201921688790.1U 2019-10-10 2019-10-10 Shaft seal device of pump Active CN210715245U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921688790.1U CN210715245U (en) 2019-10-10 2019-10-10 Shaft seal device of pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921688790.1U CN210715245U (en) 2019-10-10 2019-10-10 Shaft seal device of pump

Publications (1)

Publication Number Publication Date
CN210715245U true CN210715245U (en) 2020-06-09

Family

ID=70928493

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921688790.1U Active CN210715245U (en) 2019-10-10 2019-10-10 Shaft seal device of pump

Country Status (1)

Country Link
CN (1) CN210715245U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113309800B (en) * 2021-06-23 2022-07-22 成都千帆科技开发有限公司 Friction damping mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113309800B (en) * 2021-06-23 2022-07-22 成都千帆科技开发有限公司 Friction damping mechanism

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