Special mechanical sealing structure for submersible water pump

Abstract

The utility model discloses a special mechanical seal structure for a submersible water pump, which comprises a shaft body, a static ring, a moving ring and a seal structure main body, the seal structure main body is arranged on the outer side of the shaft body, the moving ring and the static ring are respectively arranged in the seal structure main body, and one end of the moving ring close to the shaft body is fixedly connected with the shaft body. A spring seat is arranged at one end in the sealing structure body through a set screw, first reset springs are evenly arranged on the side, close to the movable ring, of the spring seat, contact pieces are arranged at the ends, close to the movable ring, of the first reset springs, and one ends of the contact pieces are connected with the movable ring. By installing the sealing structure body, the shaft body, the static ring, the moving ring, the spring seat, the first reset spring, the contact piece, the damping pad, the guide groove and the guide block, the moving ring can be pushed to adjust a gap between the moving ring and the static ring, tight attachment of a sealing face is kept, leakage is prevented, impact of vibration on mechanical sealing is reduced, and the sealing face is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a special mechanical sealing structure for a submersible water pump. Background Art

[0002] Submersible water pump, also known as submersible pump, is a general water-lifting machine in which the motor and water pump are directly connected and submerged in water. Its working principle is that the motor drives the impeller to rotate at high speed through the pump shaft, and under the action of centrifugal force, it performs work on the liquid and converts mechanical energy into liquid energy.

[0003] Submersible water pumps are mainly used to extract and transport liquids. During operation, if there is a leakage channel between the inside and outside of the pump body, the medium will flow out of the pump body, causing waste of resources, environmental pollution and even equipment damage. Therefore, a corresponding sealing structure is required. Common submersible pump seals mostly adopt a mechanical seal structure, which generally includes a dynamic ring and a static ring, and uses the close fit of the two end faces of the dynamic ring and the static ring to achieve the sealing function. However, the submersible pump may generate vibrations during operation. If these vibrations are directly transmitted to the mechanical seal, they may damage the sealing surface, thereby affecting the sealing effect. Therefore, a special mechanical seal structure for submersible water pumps is required. Utility Model Content

[0004] The purpose of the utility model is to provide a mechanical seal structure dedicated to a submersible water pump, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a mechanical seal structure dedicated to a submersible water pump, comprising a shaft body, a static ring, a dynamic ring and a sealing structure body, the sealing structure body being provided on the outside of the shaft body, and the dynamic ring and static ring being provided inside the sealing structure body respectively, an end cover being provided on one side of the sealing structure body, the end of the dynamic ring close to the shaft body being fixedly connected to the shaft body, a spring seat being provided on one end inside the sealing structure body via a set screw, and a first return spring being evenly provided on the side of the spring seat close to the dynamic ring, a contact piece being provided on the end of the first return spring close to the dynamic ring, and one end of the contact piece being connected to the dynamic ring.

[0006] A sealing groove is provided on the side of the dynamic ring close to the shaft, and a sealing member is provided inside the sealing groove; an alloy coating is provided on the side of the dynamic ring close to the static ring, and the alloy coating is provided on the dynamic ring by thermal spraying.

[0007] Preferably, the side of the spring seat close to the first return spring is evenly connected to the first return spring through a damping pad, and the damping pad is made of rubber material.

[0008] Preferably, a guide block is provided at one end of each of the contact members, and a guide groove matching the guide block is provided on a side of the sealing structure body close to the first return spring.

[0009] Preferably, a skeleton is embedded inside the sealing member, and a rubber sleeve is wrapped outside the sealing member.

[0010] Preferably, one end of the sealing member close to the shaft body is provided with a sealing lip via a second return spring, and the sealing lip is in close contact with the shaft body.

[0011] Preferably, a dust lip is provided on the sealing member on one side of the second return spring, and one end of the dust lip contacts the shaft.

[0012] The beneficial technical effects of this technical solution are as follows: the special mechanical seal structure for the submersible water pump is equipped with a sealing structure main body, a shaft body, a static ring, a dynamic ring, a spring seat, a first return spring, a contact piece, a damping pad, a guide groove and a guide block. The dynamic ring is fixed on the shaft body, and the static ring is fixed on the pump casing of the submersible water pump and does not rotate with the shaft body. When the submersible water pump is started, the dynamic ring rotates with the shaft body, while the static ring remains stationary. The end faces of the dynamic ring and the static ring fit tightly to form an extremely thin liquid pressure film, which plays a sealing role to prevent the fluid medium from leaking from the inside of the equipment to the outside, or to prevent external impurities from entering the inside of the equipment. As the dynamic ring rotates, the temperature of the friction surface increases, which may cause the liquid film to be destroyed. At this time, under the interference of the first return spring and the contact piece, the dynamic ring can be pushed to adjust the gap between it and the static ring to keep the sealing surface tightly fitted to prevent leakage.

[0013] A submersible water pump may generate vibrations during operation. These vibrations cause one end of the dynamic ring to squeeze the contact piece, causing it to compress the first return spring. Through the elastic characteristics of the first return spring and the action of the damping pad, part of the vibration energy is absorbed, reducing the impact of the vibration on the mechanical seal, thereby protecting the sealing surface from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present utility model.

[0015] Figure 2 For the utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0016] Figure 3 For the utility model Figure 1 Enlarged cross-sectional structural diagram at point B in the middle.

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the sealing element of the present invention.

[0018] Figure 5For the utility model Figure 1 Enlarged structural diagram at point C in the middle.

[0019] In the figure: 1. Shaft; 2. Static ring; 3. Dynamic ring; 4. Sealing structure body; 5. Spring seat; 6. Set screw; 7. First return spring; 8. End cover; 9. Contact piece; 10. Guide block; 11. Guide groove; 12. Damping pad; 13. Sealing groove; 14. Sealing piece; 15. Skeleton; 16. Second return spring; 17. Rubber sleeve; 18. Sealing lip; 19. Dust lip; 20. Alloy coating. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-5 The utility model provides an embodiment: a mechanical seal structure dedicated to a submersible water pump, comprising a shaft body 1, a static ring 2, a dynamic ring 3 and a sealing structure main body 4. The sealing structure main body 4 is arranged on the outside of the shaft body 1, and the dynamic ring 3 and the static ring 2 are respectively arranged inside the sealing structure main body 4. An end cover 8 is provided on one side of the sealing structure main body 4, and one end of the dynamic ring 3 close to the shaft body 1 is fixedly connected to the shaft body 1; the sealing structure main body 4 consists of a dynamic ring 3 and a static ring 2, the dynamic ring 3 is fixed on the shaft body 1, and the static ring 2 is fixed on the pump casing of the submersible water pump and does not rotate with the shaft body 1.

[0022] When the submersible water pump is started, the dynamic ring 3 rotates with the shaft 1, while the static ring 2 remains stationary. The end faces of the dynamic ring 3 and the static ring 2 fit tightly together to form an extremely thin liquid pressure film, which acts as a seal to prevent the fluid medium from leaking from the inside of the equipment to the outside, or to prevent external impurities from entering the equipment.

[0023] A spring seat 5 is provided at one end inside the sealing structure body 4 through a set screw 6, and a first return spring 7 is evenly provided on the side of the spring seat 5 close to the dynamic ring 3. A contact piece 9 is provided at one end of the first return spring 7 close to the dynamic ring 3, and one end of the contact piece 9 is connected to the dynamic ring 3.

[0024] As the dynamic ring 3 rotates, the temperature of the friction surface increases and may cause the liquid film to be destroyed. At this time, under the resistance of the first return spring 7 and the contact piece 9, the dynamic ring 3 can be pushed to adjust the gap between it and the static ring 2 to maintain a close fit of the sealing surface and prevent leakage.

[0025] The side of the spring seat 5 close to the first return spring 7 is evenly connected to the first return spring 7 through the damping pad 12, and the damping pad 12 is made of rubber material; the submersible water pump may generate vibrations during operation, and these vibrations cause one end of the dynamic ring 3 to squeeze the contact piece 9, causing it to compress the first return spring 7. Through the elastic characteristics of the first return spring 7 and the action of the damping pad 12, part of the vibration energy is absorbed, reducing the impact of the vibration on the mechanical seal, thereby protecting the sealing surface from damage.

[0026] A guide block 10 is provided at one end of the contact member 9, and a guide groove 11 matching the guide block 10 is opened on the side of the sealing structure body 4 close to the first return spring 7, which can limit the range of motion of the first return spring 7 and prevent the first return spring 7 from twisting and deflecting.

[0027] An alloy coating 20 is provided on the side of the dynamic ring 3 close to the static ring 2, and the alloy coating 20 is provided on the dynamic ring 3 by thermal spraying; as the static ring 2 and the dynamic ring 3 rub against each other, the surface temperature of both will increase. When the temperature is too high, the alloy coating 20 begins to melt, converting dry friction into fluid friction, thereby greatly reducing the wear between the static ring 2 and the dynamic ring 3.

[0028] A sealing groove 13 is provided on the side of the dynamic ring 3 close to the shaft body 1, and a sealing member 14 is provided inside the sealing groove 13, and the outside of the sealing member 14 is wrapped with a rubber sleeve 17; a sealing lip 18 is provided at one end of the sealing member 14 close to the shaft body 1 through a second return spring 16, and the sealing lip 18 fits tightly against the shaft body 1.

[0029] The sealing lip 18 on the seal 14 fits tightly against the shaft 1. Due to the elastic force of the elastic material and the action of the second return spring 16, the sealing lip 18 is compressed axially, thereby fitting tightly against the surface of the shaft 1. When the shaft 1 rotates, the sealing lip 18 is radially expanded due to the centrifugal force, further enhancing the sealing effect. In addition, the seal 14 is embedded with a skeleton 15 to support and fix it, so that the seal 14 maintains its shape and tension. A dust lip 19 is provided on the seal 14 on the side of the second return spring 16, and one end of the dust lip 19 contacts the shaft 1 to prevent external contaminants from entering the interior.

[0030] Working principle: When the embodiment of the present application is in use, the sealing structure main body 4 is composed of a dynamic ring 3 and a static ring 2. The dynamic ring 3 is fixed on the shaft body 1, and the static ring 2 is fixed on the pump casing of the submersible water pump and does not rotate with the shaft body 1. When the submersible water pump is started, the dynamic ring 3 rotates with the shaft body 1, while the static ring 2 remains stationary. The end faces of the dynamic ring 3 and the static ring 2 fit tightly together to form an extremely thin liquid pressure film, which plays a sealing role to prevent the fluid medium from leaking from the inside of the equipment to the outside, or to prevent external impurities from entering the inside of the equipment. As the dynamic ring 3 rotates, the temperature of the friction surface increases, which may cause the liquid film to be destroyed. At this time, under the interference of the first return spring 7 and the contact piece 9, the dynamic ring 3 can be pushed to adjust the gap between it and the static ring 2 to keep the sealing surface in close fit and prevent leakage.

[0031] A submersible water pump may generate vibrations during operation. These vibrations cause one end of the dynamic ring 3 to squeeze the contact piece 9, causing it to compress the first return spring 7. The elastic characteristics of the first return spring 7 and the action of the damping pad 12 absorb part of the vibration energy, reducing the impact of the vibration on the mechanical seal, thereby protecting the sealing surface from damage. The guide block 10 at one end of the contact piece 9 slides in the guide groove 11, which can limit the range of motion of the first return spring 7 and prevent the first return spring 7 from twisting and deflecting. In addition, a seal 14 is provided between the dynamic ring 3 and the shaft body 1. The sealing lip 18 on the seal 14 fits tightly with the shaft body 1. The seal 14 is wrapped with a rubber sleeve 17. Due to the elastic force of the elastic material and the action of the second return spring 16, the sealing lip 18 will be axially compressed, thereby fitting tightly to the surface of the shaft body 1. When the shaft body 1 rotates, the sealing lip 18 will be radially expanded due to the action of centrifugal force, thereby further enhancing the sealing effect. In addition, a skeleton 15 is embedded in the interior of the seal 14 to support and fix it, so that the seal 14 maintains its shape and tension.

Claims

1. A mechanical seal structure for a submersible water pump, characterized in that: The invention comprises a shaft (1), a static ring (2), a dynamic ring (3) and a sealing structure body (4), wherein the sealing structure body (4) is provided on the outside of the shaft (1), and the dynamic ring (3) and the static ring (2) are provided inside the sealing structure body (4), an end cover (8) is provided on one side of the sealing structure body (4), and the end of the dynamic ring (3) close to the shaft (1) is fixedly connected to the shaft (1), and a spring seat (5) is provided on one end of the sealing structure body (4) through a set screw (6), and the spring seat (5) is close to the dynamic ring. A first return spring (7) is evenly provided on one side of the movable ring (3), and a contact member (9) is provided on one end of the first return spring (7) close to the movable ring (3), and one end of the contact member (9) is connected to the movable ring (3); a sealing groove (13) is provided on one side of the movable ring (3) close to the shaft body (1), and a sealing member (14) is provided inside the sealing groove (13); an alloy coating (20) is provided on one side of the movable ring (3) close to the stationary ring (2), and the alloy coating (20) is provided on the movable ring (3) by thermal spraying.

2. A mechanical seal structure for a submersible water pump according to claim 1, characterized in that: The side of the spring seat (5) close to the first return spring (7) is evenly connected to the first return spring (7) through a damping pad (12), and the damping pad (12) is made of rubber material.

3. The mechanical seal structure for a submersible water pump according to claim 1, characterized in that: A guide block (10) is provided at one end of the contact member (9), and a guide groove (11) matching the guide block (10) is provided on one side of the sealing structure body (4) close to the first return spring (7).

4. The mechanical seal structure for a submersible water pump according to claim 1, characterized in that: The inside of each sealing member (14) is embedded with a skeleton (15), and the outside of each sealing member (14) is wrapped with a rubber sleeve (17).

5. The mechanical seal structure for a submersible water pump according to claim 1, characterized in that: One end of the sealing member (14) close to the shaft body (1) is provided with a sealing lip (18) via a second return spring (16), and the sealing lip (18) is tightly fitted to the shaft body (1).

6. The mechanical seal structure for a submersible water pump according to claim 5, characterized in that: A dustproof lip (19) is provided on the seal (14) on one side of the second return spring (16), and one end of the dustproof lip (19) is in contact with the shaft (1).

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