Mechanical sealing device for multi-stage centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a mechanical sealing device for a multi-stage centrifugal pump, which comprises a middle shaft, a fixed spring seat, a first limiting piece, a spiral spring, a movable spring seat, a second limiting piece, a clamping block, a movable sealing ring, a clamping groove, a concave clamping groove, a gasket, a convex clamping block, a static sealing ring, a U-shaped clamping groove, a sealing ring, a static ring seat and the like. The spiral spring is arranged in the middle shaft in a penetrating mode through the fixed spring seat and the first limiting piece which are installed on the outer side of the middle shaft, and one end of the spiral spring is arranged on the outer side of the first limiting piece in a sleeving mode and abuts against the fixed spring seat. In the using process of the mechanical sealing device, the spring installation mode is rapid and convenient, proper pressing force can be provided when one side of the movable sealing ring is abraded, automatic compensation of the axial friction face is achieved, and the service life of the mechanical sealing device is prolonged. And the use effect of the sealing device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a mechanical sealing device for a multi-stage centrifugal pump. Background Art

[0002] A multistage centrifugal pump is a combination of two or more centrifugal pumps with the same function. In terms of fluid channel structure, the medium pressure relief port of the first stage is connected to the inlet of the second stage, and the medium pressure relief port of the second stage is connected to the inlet of the third stage. Such a series connection mechanism forms a multistage centrifugal pump. In order to ensure the normal use of the centrifugal pump, it is usually necessary to equip it with a corresponding centrifugal pump mechanical seal device.

[0003] For example, the authorization announcement number is a silicon carbide mechanical seal device for a multi-stage centrifugal pump, including a drive seat sleeve, a stationary ring assembly and a dynamic ring assembly, the side walls of the dynamic ring and the dynamic ring seat are provided with a first circumferential limit structure for limiting the two, the side walls of the connection between the dynamic ring seat and the drive seat are provided with a second circumferential limit structure for limiting the two, the spring is sleeved on the outer wall of the connection between the dynamic ring and the drive seat, one end of the spring is against the step end face of the outer wall of the dynamic ring seat, and the other end is against the step end face of the outer wall of the drive seat. The mechanical seal device makes the dynamic ring, the dynamic ring seat, and the drive block simple in structure, convenient in processing, and low in material cost; the spring is installed outside the side wall of the matching part of the drive block and the drive seat, avoiding the spring being stuck by impurities. However, the structure of the utility model is relatively complex, which is not convenient for the installation and later maintenance and parts replacement operations of the installers. For this reason, we propose a mechanical seal device for a multi-stage centrifugal pump, which solves the problem of inconvenient installation and removal of the device, improves the convenience of use of the device, thereby improving the installation efficiency of the operators and saving installation and maintenance costs. Utility Model Content

[0004] The purpose of the utility model is to provide a mechanical seal device for a multi-stage centrifugal pump to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A mechanical sealing device for a multi-stage centrifugal pump comprises a central shaft, a fixed spring seat, a first limiting plate, a coil spring, a movable spring seat, a second limiting plate, a blocking block, a dynamic sealing ring, a blocking groove, a concave blocking groove, a gasket, a convex blocking block, a static sealing ring, a U-shaped blocking groove, a sealing ring, a static ring seat, a U-shaped blocking block, a strip blocking groove, and a through hole. The fixed spring seat is fixedly installed on the outside of the central shaft, the first limiting plate is fixedly arranged on one side of the fixed spring seat, one end of the coil spring is movably installed on the outside of the first limiting plate, and the movable spring seat is movably installed on the other end of the coil spring.

[0007] Preferably, the second limiting piece is fixedly arranged on one side of the movable spring seat, the coil spring is movably installed on the outside of the second limiting piece, and the locking block is fixedly arranged on the other side of the movable spring seat.

[0008] Preferably, the dynamic sealing ring is movably mounted on the other side of the movable spring seat, and the locking groove is arranged on the outer side of the dynamic sealing ring.

[0009] Preferably, the positioning block can be installed inside the positioning groove, and the concave positioning groove is opened on one side of the dynamic sealing ring.

[0010] Preferably, the convex clamping block is fixedly arranged on one side of the gasket, the gasket is clamped in the concave clamping groove through the convex clamping block, and the U-shaped clamping groove is opened on the outside of the static sealing ring.

[0011] Preferably, the U-shaped clamping block is fixedly arranged on the inner wall of the stationary ring seat, and the U-shaped clamping groove can be clamped on the U-shaped clamping block.

[0012] Preferably, the sealing ring is fixedly installed between the stationary ring seat and the stationary sealing ring, the strip-shaped groove is provided on the outer side of one end of the central axis, and the through hole is provided on one side of the stationary ring seat.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. A mechanical sealing device for a multi-stage centrifugal pump, wherein a coil spring is inserted into the central shaft through a fixed spring seat and a first limit plate fixedly installed on the outer side of the central shaft, and one end of the coil spring is sleeved on the outer side of the first limit plate and abuts against the fixed spring seat, and then the coil spring is inserted into the outer side of the central shaft through a movable spring seat and a second limit plate, so that the other end of the coil spring can be sleeved on the outer side of the second limit plate and abut against one side of the movable spring seat. During the use of the mechanical sealing device, such a spring installation method is relatively quick and convenient. It can provide appropriate clamping force when one side of the dynamic sealing ring is worn, realize automatic compensation of the axial friction surface, and ensure the use effect of the sealing device.

[0015] 2. This mechanical seal device for a multi-stage centrifugal pump realizes convenient disassembly and assembly and retention of the static sealing ring in actual use through the mutual engagement and nesting of the U-shaped groove, sealing ring, static ring seat and U-shaped block arranged on one side of the static sealing ring. The sealing ring arranged between the static ring seat and the static sealing ring realizes good sealing and anti-leakage effect of the static sealing ring, thereby preventing the entry of impurities causing corrosion and aging of the equipment, thereby extending the service life of the mechanical seal device and ensuring the sealing effect during its use, reflecting the practicality and economic benefits of the mechanical seal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the dynamic sealing ring of the utility model;

[0019] Figure 4 It is a schematic diagram of the movable spring seat of the utility model.

[0020] In the figure: 100, central axis; 101, fixed spring seat; 102, first limiting plate; 103, coil spring; 104, movable spring seat; 105, second limiting plate; 106, blocking block; 200, dynamic sealing ring; 201, blocking groove; 202, concave blocking groove; 203, gasket; 204, convex blocking block; 205, static sealing ring; 206, U-shaped blocking groove; 300, sealing ring; 301, static ring seat; 302, U-shaped blocking block; 303, strip blocking groove; 304, through hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-Figure 4 As shown, a technical solution provided by the utility model:

[0023] A mechanical sealing device for a multistage centrifugal pump comprises a central axis 100, a fixed spring seat 101, a first limiting piece 102, a coil spring 103, a movable spring seat 104, a second limiting piece 105, a blocking block 106, a dynamic sealing ring 200, a blocking groove 201, a concave blocking groove 202, a gasket 203, a convex blocking block 204, a static sealing ring 205, a U-shaped blocking groove 206, a sealing ring 300, a static ring seat 301, a U-shaped blocking block 302, a strip-shaped blocking groove 303, and a through hole 304. The fixed spring seat 101 is fixedly installed on the outside of the central axis 100, the first limiting piece 102 is fixedly arranged on one side of the fixed spring seat 101, one end of the coil spring 103 is movably installed on the outside of the first limiting piece 102, and the movable spring seat 104 is movably installed on the other end of the coil spring 103.

[0024] In this embodiment, preferably, the second limiting piece 105 is fixedly arranged on one side of the movable spring seat 104 , the coil spring 103 is movably installed on the outside of the second limiting piece 105 , and the locking block 106 is fixedly arranged on the other side of the movable spring seat 104 .

[0025] In this embodiment, preferably, the dynamic sealing ring 200 is movably installed on the other side of the movable spring seat 104 , and the locking groove 201 is opened on the outer side of the dynamic sealing ring 200 .

[0026] In this embodiment, preferably, the locking block 106 can be installed inside the locking groove 201 , and the concave locking groove 202 is opened on one side of the dynamic sealing ring 200 .

[0027] In this embodiment, preferably, the convex block 204 is fixedly disposed on one side of the gasket 203 , the gasket 203 is engaged in the concave groove 202 through the convex block 204 , and the U-shaped groove 206 is provided on the outer side of the static sealing ring 205 .

[0028] In this embodiment, preferably, the U-shaped block 302 is fixedly disposed on the inner wall of the stationary ring seat 301 , and the U-shaped slot 206 can be snap-connected to the U-shaped block 302 .

[0029] In this embodiment, preferably, the sealing ring 300 is fixedly installed between the static ring seat 301 and the static sealing ring 205 , the strip-shaped slot 303 is opened on the outer side of one end of the central axis 100 , and the through hole 304 is opened on one side of the static ring seat 301 .

[0030] When using a mechanical seal device for a multi-stage centrifugal pump of the present embodiment, the coil spring 103 is first inserted into the central shaft 100 through the fixed spring seat 101 and the first limiting plate 102 fixedly installed on the outer side of the central shaft 100, and one end is sleeved on the outer side of the first limiting plate 102 and abuts against the fixed spring seat 101, and then inserted on the outer side of the central shaft 100 through the movable spring seat 104 and the second limiting plate 105, so that the other end of the coil spring 103 can be sleeved on the outer side of the second limiting plate 105 and abut against one side of the movable spring seat 104. During the use of the mechanical seal device, such a spring installation method is relatively quick and convenient. It can provide a suitable clamping force when one side of the dynamic seal ring 300 is worn, realize automatic compensation of the axial friction surface, and ensure the use effect of the sealing device. Through the mutual engagement and nesting of the U-shaped groove 206, the sealing ring 300, the static ring seat 301 and the U-shaped block 302 arranged on one side of the static sealing ring 205, the convenient disassembly and assembly and retention effect of the static sealing ring 205 are achieved in actual use. Through the sealing ring 300 arranged between the static ring seat 301 and the static sealing ring 205, a good sealing and anti-leakage effect of the static sealing ring 300 is achieved, thereby preventing the entry of impurities causing corrosion and aging of the equipment, thereby extending the service life of the mechanical sealing device and ensuring the sealing effect during its use, reflecting the practicality and economic benefits of the mechanical sealing device.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A mechanical seal device for a multistage centrifugal pump, comprising a central shaft (100), a fixed spring seat (101), a first limiting piece (102), a coil spring (103), a movable spring seat (104), a second limiting piece (105), a blocking block (106), a dynamic sealing ring (200), a blocking groove (201), a concave blocking groove (202), a gasket (203), a convex blocking block (204), a static sealing ring (205), a U-shaped blocking groove (206), a sealing ring (300), a static ring seat (301), a U-shaped blocking block (302), a strip-shaped blocking groove (303), and a through hole (304), characterized in that: The fixed spring seat (101) is fixedly mounted on the outside of the central axis (100), the first limiting plate (102) is fixedly arranged on one side of the fixed spring seat (101), one end of the coil spring (103) is movably mounted on the outside of the first limiting plate (102), and the movable spring seat (104) is movably mounted on the other end of the coil spring (103).

2. A mechanical seal device for a multistage centrifugal pump according to claim 1, characterized in that: The second limiting plate (105) is fixedly arranged on one side of the movable spring seat (104), the coil spring (103) is movably installed on the outside of the second limiting plate (105), and the locking block (106) is fixedly arranged on the other side of the movable spring seat (104).

3. A mechanical seal device for a multistage centrifugal pump according to claim 2, characterized in that: The dynamic sealing ring (200) is movably mounted on the other side of the movable spring seat (104), and the locking groove (201) is arranged on the outside of the dynamic sealing ring (200).

4. A mechanical seal device for a multi-stage centrifugal pump according to claim 3, characterized in that: The locking block (106) can be installed inside the locking groove (201), and the concave locking groove (202) is opened on one side of the dynamic sealing ring (200).

5. A mechanical seal device for a multi-stage centrifugal pump according to claim 4, characterized in that: The convex clamping block (204) is fixedly arranged on one side of the gasket (203), the gasket (203) is clamped in the concave clamping groove (202) through the convex clamping block (204), and the U-shaped clamping groove (206) is opened on the outside of the static sealing ring (205).

6. A mechanical seal device for a multi-stage centrifugal pump according to claim 5, characterized in that: The U-shaped clamping block (302) is fixedly arranged on the inner wall of the stationary ring seat (301), and the U-shaped clamping groove (206) can be clamped on the U-shaped clamping block (302).

7. A mechanical seal device for a multi-stage centrifugal pump according to claim 6, characterized in that: The sealing ring (300) is fixedly installed between the static ring seat (301) and the static sealing ring (205), the strip-shaped slot (303) is provided on the outside of one end of the central axis (100), and the through hole (304) is provided on one side of the static ring seat (301).

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