Double-end-face mechanical seal of rotary shell pump

Abstract

The double-end-face mechanical seal of the rotary shell pump comprises a gland arranged on the left side of an outer shell and a shaft sleeve installed in the middle of the gland in a penetrating mode, meanwhile, a shaft body is installed in the middle of the shaft sleeve in a penetrating mode, a spring is arranged in the gland, and a push ring is arranged at the movable end of the spring. And the spring is connected with the outer static ring through a push ring, and a positioning block is arranged at the right end of the base. According to the double-end-face mechanical seal of the rotary shell pump, through the arrangement of the sealing assembly, the overall sealing effect of the rotary shell pump is improved, double-end sealing can be achieved, leakage is prevented in the medium conveying process, when the shaft body rotates rapidly, especially when the pressure in the rotary shell pump changes, the pressure extrudes the inner movable ring at the moment, and the sealing effect of the rotary shell pump is improved. In addition, the outer movable ring and the outer static ring can extrude the spring at the same time, in combination with elastic deformation of the spring, the good buffering effect can be achieved, the pressure change can be better coped, and the service life of the whole mechanical seal is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of mechanical seal of volute pump, concretely to a volute pump double end face mechanical seal. BACKGROUND

[0002] Volute pump refers to a kind of novel plugging small flow high pressure pump of structure and working principle, also be called rotary jet pump or pitot tube pump, the main function of volute pump is used to transport corrosive liquid, high temperature liquid and high viscosity liquid;

[0003] Such as announcement number CN205047491U, discloses a mechanical seal for volute pump, including non-compensation ring, compensation ring, compensation ring seat, spring, spring seat, the non-compensation ring, compensation ring, compensation ring seat are sleeved on pump shaft, the compensation ring is installed on compensation ring seat, the spring seat is sleeved on compensation ring seat, spring is installed between the two.The utility model is characterized by: the whole sealing structure is compact, reduces the number of parts, shortens the required axial space, fully meets the function and installation demand of volute pump sealing;

[0004] However, the prior art only can seal one side, it is inconvenient to seal the volute pump on both ends, when the pressure of the medium transported changes, it is inconvenient to buffer and adjust, the overall service life will be affected, for example, the above-mentioned comparative patent has this problem;

[0005] Therefore, we propose a volute pump double end face mechanical seal to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a volute pump double end face mechanical seal to solve the above-mentioned problems in the prior art, that is, only one side can be sealed, it is inconvenient to seal the volute pump on both ends, when the pressure of the medium transported changes, it is inconvenient to buffer and adjust, and the overall service life will be affected.

[0007] To achieve the above object, the utility model provides the following technical scheme: a volute pump double end face mechanical seal, including the gland that is arranged at the left side of external shell and the shaft sleeve that is installed in the middle part of the gland, and the middle part of the shaft sleeve is installed with the shaft body, wherein, the right end of the gland is hingedly provided with the base;

[0008] Further comprising:

[0009] The inside of the gland is provided with a spring, and the movable end of the spring is provided with a push ring, and the spring is connected with the outer static ring through the push ring;

[0010] Among them, the fourth sealing ring is arranged between the outer static ring and the push ring;

[0011] The right end of the base is provided with a positioning block, and the inner side of the base is provided with a sealing assembly.

[0012] Preferably, the inner side of the right end of the base is provided with an inner static ring, and the right end of the inner static ring is provided with an inner dynamic ring.

[0013] The sixth sealing ring is arranged between the base and the inner static ring.

[0014] Preferably, the upper and lower sides of the right end of the shaft sleeve are both provided with a No. 1 inner hexagonal taper end set screw for limiting the space between the shaft sleeve and the transmission ring, and the space between the shaft sleeve and the inner shaft body is combined with a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring, a seventh sealing ring and an eighth sealing ring to form a sealing assembly.

[0015] Meanwhile, the right end of the shaft body is provided with a No. 2 inner hexagonal concave end set screw.

[0016] Preferably, the first sealing ring is arranged between the shaft sleeve and the transmission ring, the transmission ring and the outer shell are limited by a No. 4 inner hexagonal cylindrical head screw, the first sealing ring is arranged between the inner side of the transmission ring and the inner dynamic ring, and the eighth sealing ring is arranged between the outer side of the transmission ring and the inner dynamic ring.

[0017] Preferably, the third sealing ring is arranged between the shaft sleeve and the outer dynamic ring, and the fourth sealing ring is arranged between the shaft sleeve and the outer static ring.

[0018] Preferably, the fifth sealing ring is arranged between the gland and the base, and the No. 3 inner hexagonal cylindrical head screw is arranged between the gland and the base for limiting.

[0019] Preferably, the seventh sealing ring is arranged between the base and the outer shell.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows: the double-end mechanical seal of the shell pump improves the sealing effect of the whole shell pump through the arrangement of the sealing assembly, realizes double-end sealing, prevents leakage during medium conveying, and when the shaft body rotates quickly, especially when the pressure in the shell pump changes, the pressure extrudes the inner dynamic ring, the inner static ring stretches in the base and extrudes the spring, the outer dynamic ring and the outer static ring simultaneously extrude the spring, the spring elastically deforms, good buffering effect is achieved, the pressure change is better coped with, and the service life of the whole mechanical seal is prolonged.

[0021] 1. It is equipped with a spring, an inner moving ring, an inner stationary ring, an outer moving ring, and an outer stationary ring. When the shaft rotates, the internal pressure changes, causing the inner stationary ring, the inner stationary ring, the outer moving ring, and the outer stationary ring to compress the spring, which can buffer and protect the entire mechanical seal device, allowing the device to better adapt to changes in pressure.

[0022] 2. Sealing assembly: The sealing assembly includes a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring, a seventh sealing ring, and an eighth sealing ring. The sealing assembly connects all the components, providing a strong overall seal and preventing leakage during the transport of media. Attached Figure Description

[0023] Figure 1 This is a frontal sectional view of the present invention.

[0024] In the diagram: 1. Spring; 2. Push ring; 3. Pressure cap; 4. Inner moving ring; 5. No. 1 socket head cap set screw; 6. Inner stationary ring; 7. Outer moving ring; 8. Outer stationary ring; 9. No. 2 socket head cap set screw; 10. Drive ring; 11. First sealing ring; 12. Bushing; 13. Second sealing ring; 14. Third sealing ring; 15. Fourth sealing ring; 16. Fifth sealing ring; 17. No. 3 socket head cap screw; 18. Sixth sealing ring; 19. Base; 20. Seventh sealing ring; 21. Eighth sealing ring; 22. Positioning block; 23. No. 4 socket head cap screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1 The present invention provides the following technical solution.

[0027] Example 1: To address the problems of existing technologies that can only seal one side, making it inconvenient to double-end seal the vortex pump, and hindering buffering and adjustment when the pressure of the pumped medium changes, thus affecting the overall service life, this example provides a double-end mechanical seal for the vortex pump. The seal includes a pressure cap 3 located on the left side of the outer casing and a bushing 12 that penetrates the middle of the pressure cap 3. A shaft is installed through the middle of the bushing 12, and a No. 2 internal hexagon socket head cap set screw 9 is located at the right end of the shaft. A base 19 is engaged at the right end of the pressure cap 3. A sixth sealing ring 18 is provided between the inner stationary ring 6 and the pressure cap 3, and a No. 3 internal hexagonal head screw 17 is provided between the pressure cap 3 and the base 19 for limiting. A spring 1 is provided inside the pressure cap 3, and a push ring 2 is provided at the movable end of the spring 1. The spring 1 is connected to the outer stationary ring 8 through the push ring 2. A fourth sealing ring 15 is provided between the outer stationary ring 8 and the push ring 2. A positioning block 22 is provided at the right end of the base 19, and a sealing assembly is provided on the inner side of the base 19. The sealing assembly is composed of a second sealing ring 13, a third sealing ring 14, a fourth sealing ring 15, a fifth sealing ring 16, a seventh sealing ring 20 and an eighth sealing ring 21.

[0028] like Figure 1 As shown, the first sealing ring 11 is disposed between the bushing 12 and the transmission ring 10. The transmission ring 10 is limited to the outer housing by a No. 4 internal hexagonal head screw 23. Moreover, the upper and lower sides of the right end of the bushing 12 are provided with No. 1 internal hexagonal cone end set screws 5 for limiting the connection between the bushing 12 and the transmission ring 10. Through the arrangement of the first sealing ring 11, the seventh sealing ring 20, the eighth sealing ring 21 and the sealing assembly, a good sealing effect can be achieved at the connection between the various components. Moreover, the whole can achieve double-end sealing, which can effectively prevent leakage of the transported medium. When the shaft rotates at high speed in the pump body, the pressure inside the pump body changes and squeezes the inner moving ring 4, the inner stationary ring 6, the outer moving ring 7 and the outer stationary ring 8. At this time, the inner moving ring 4, the inner stationary ring 6, the outer moving ring 7 and the outer stationary ring 8 can squeeze the spring 1 to achieve compensation. The spring 1 undergoes elastic deformation and can play a good buffering and protection role, making better use of pressure changes and extending the overall service life.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double end face mechanical seal of a volute pump, comprising a gland (3) arranged at the left side of an outer shell and a shaft sleeve (12) penetratingly installed in the middle of the gland (3), and a shaft body penetratingly installed in the middle of the shaft sleeve (12), wherein, The right end of the gland (3) is matched with a base (19); It is characterized in that further comprising: The inside of the gland (3) is provided with a spring (1), and the movable end of the spring (1) is provided with a push ring (2), and the spring (1) is connected with the outer static ring (8) through the push ring (2); The fourth sealing ring (15) is arranged between the outer static ring (8) and the push ring (2). The right end of the base (19) is provided with a positioning block (22), and the inner side of the base (19) is provided with a sealing assembly.

2. A double mechanical seal for a volute pump according to claim 1, characterized in that: The inner side of the right end of the base (19) is provided with an inner static ring (6), and the right end of the inner static ring (6) is provided with an inner dynamic ring (4). The sixth sealing ring (18) is arranged between the base (19) and the inner static ring (6).

3. A double mechanical seal for a volute pump as defined in claim 1, wherein: The upper and lower sides of the right end of the shaft sleeve (12) are provided with a No. 1 inner hexagonal taper end set screw (5) for limiting the shaft sleeve (12) and the transmission ring (10), and the shaft sleeve (12) and the inner shaft are provided with a second sealing ring (13), a third sealing ring (14), a fourth sealing ring (15), a fifth sealing ring (16), a seventh sealing ring (20) and an eighth sealing ring (21) combined to form a sealing assembly. Meanwhile, the right end of the shaft body is provided with a No. 2 inner hexagonal concave end set screw (9).

4. A double mechanical seal for a volute pump according to claim 3, wherein: The first sealing ring (11) is arranged between the shaft sleeve (12) and the transmission ring (10), and the transmission ring (10) and the outer shell are limited by the No. 4 inner hexagonal cylindrical head screw (23), the first sealing ring (11) is arranged between the transmission ring (10) and the inner side of the inner dynamic ring (4), and the eighth sealing ring (21) is arranged between the transmission ring (10) and the outer side of the inner dynamic ring (4).

5. A double mechanical seal for a volute pump as defined in claim 4, wherein: The third sealing ring (14) is arranged between the shaft sleeve (12) and the outer dynamic ring (7), and the fourth sealing ring (15) is arranged between the shaft sleeve (12) and the outer static ring (8).

6. A double mechanical seal for a volute pump as defined in claim 1, wherein: The fifth sealing ring (16) is arranged between the gland (3) and the base (19), and the No. 3 inner hexagonal cylindrical head screw (17) is arranged between the gland (3) and the base (19) to limit the position.

7. A double mechanical seal for a volute pump as defined in claim 2 wherein: The seventh sealing ring (20) is arranged between the base (19) and the outer shell.

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