CN218093571U - Integrated mechanical seal for double-suction pump - Google Patents

Abstract

The utility model provides a packaged mechanical seal for a double-suction pump, which includes a shaft sleeve and a gland. The moving ring at one end of the gland is rotatably abutted in the circumferential direction, and a first installation groove is provided on the inner side of one end of the gland near the moving ring, and one end of the static ring is slidably fitted in the first installation groove, and the first installation groove There is an elastic compensating component between the bottom of the cover and the static ring. The end surface of the other end of the gland is detachably connected with a plurality of limit blocks distributed along the circumference. The outer wall of the sleeve is provided with a limit groove. Each limit block The radial inner ends of the glands are inserted and fitted in the limit groove; the radial inner side of the gland away from the static ring is also provided with a throttling ring, and the end of the gland far away from the static ring is provided with an axial limit throttling ring platen. The utility model discloses a packaged mechanical seal for a double-suction pump, which has the advantages of simple structure, convenient assembly and disassembly, stable sealing performance and long service life.

Description

Cartridge mechanical seal for double suction pump

technical field

The utility model relates to the technical field of mechanical seals, in particular to a cartridge-type mechanical seal for double-suction pumps.

Background technique

A mechanical seal is a shaft seal device for a rotating machine. Such as centrifugal pumps, centrifuges, reactors and compressors and other equipment. Since the rotating shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a stop Leaking shaft seal. There are many types of shaft seals. Because mechanical seals have the advantages of less leakage and long life, mechanical seals are the most important shaft sealing method in these equipments.

As an important form of centrifugal pump, double-suction pump is widely used in industry, urban water supply and drainage because of its high lift and large flow rate. Water and other liquids. Most of the mechanical seals currently used in double-suction pump structures are bulk structures, that is, the moving ring components, static ring components, and fixed glands are installed separately during installation, which makes the installation process complicated and prone to sealing during installation. The bumping of the surface will cause the seal to fail; this bulk structure needs to be installed on site one by one, if the installer does not pay attention, parts will be missing; and this bulk structure will be troublesome to disassemble in the later maintenance. The allowable PV value in the process is also relatively low, resulting in a decrease in the service life of the mechanical seal in some high-pressure and high-speed operating conditions.

Utility model content

The problem to be solved by the utility model is: to overcome at least one defect in the prior art, and to provide a packaged mechanical seal for a double-suction pump, which has a simple structure, convenient assembly and disassembly, and stable sealing performance.

In order to solve the above problems, the utility model provides a cartridge mechanical seal for double-suction pumps, which includes a shaft sleeve and a gland sleeved on the outside of the shaft sleeve. One end of the shaft sleeve is equipped with a moving ring. The end of the gland close to the moving ring is equipped with a static ring, and the end of the static ring away from the gland is in rotatable contact with the moving ring along the circumferential direction, and the end of the gland near the moving ring The radial inner side of one end is provided with a first installation groove, and one end of the stationary ring is slidably fitted in the first installation groove, and a bottom of the first installation groove and the stationary ring is provided with a Elastic compensation assembly, the end surface of the other end of the gland is detachably connected with a plurality of limit blocks distributed along the circumferential direction, the outer wall of the sleeve is provided with limit grooves, the radial direction of each limit block The inner ends are all inserted and fitted in the limiting groove; the gland is further provided with a second installation groove on the radial inner side of the end away from the static ring, and a throttling ring is arranged in the second installation groove, and The end of the gland away from the static ring is provided with a pressure plate for axially limiting the throttle ring.

Compared with the prior art, the utility model is beneficial in that:

The mechanical seal structure of the utility model is a simple assembly structure, which is applied to double-suction pumps and is mainly used to replace the existing mechanical seals in bulk. The assembly structure is in the form of complete assembly and disassembly , does not need to install individual components one by one, which can effectively improve the installation efficiency, and can avoid the occurrence of missing and wrong installation of parts; and the structure of the cartridge mechanical seal adopts a static ring compensation structure, so that during operation The elastic compensator is not affected by the rotating parts, so as to ensure a more stable elastic compensation performance, that is, to ensure the stability of the sealing performance; in addition, this structure is also equipped with a throttle ring, when the main seal grinding surface leaks, the throttle ring It can temporarily seal the medium, prevent the medium from leaking directly to the atmosphere, and provide a buffer time for the maintenance and replacement of the mechanical seal.

As an improvement, one end of the choke ring abuts against the pressure plate, an elastic member is provided between the bottom of the second installation groove and the other end of the choke ring, and the choke ring is in contact with the pressure plate. The abutting end surfaces of the pressure plates are all polished sealing surfaces. In the above improved structure, the pressure plate structure realizes the axial limit of the choke ring, and the end face of the choke ring and the end face of the pressure plate are both polished sealing surfaces. Leakage occurs, allowing the medium to leak from the orifice ring to the atmosphere.

As a further improvement, a first anti-rotation pin is provided at the bottom of the second installation groove, and a first anti-rotation pin groove matching the first anti-rotation pin is opened on the throttle ring. In the above improved structure, the setting of the first anti-rotation pin enables the choke ring to remain stable when it receives the circumferential force, avoiding the positional deviation of the choke ring during the operation of the mechanical seal, and ensuring the seal between its end face and the end face of the pressure plate stability.

As a further improvement, the elastic member includes a plurality of first springs, and the bottom of the second installation groove is provided with a plurality of first spring holes equally divided along the circumferential direction, and one end of each of the first springs is fitted on the first spring. The end of each first spring is in contact with the bottom of the first spring hole, and the other end of each first spring is in contact with the end of the throttle ring away from the pressure plate. In the above improved structure, multiple first springs and elastic parts are used, which can make the force acting on the end surface of the choke ring more stable, and the choke ring is driven by the elastic force against the end surface of the pressure plate, and it also has a certain buffer. effect, to avoid damage to the throttle ring.

As a further improvement, there is a collection channel between the peripheral outer wall of the throttle ring and the peripheral side wall of the second installation groove, and the side wall of the gland is opened to communicate with the The liquid collecting hole of the collecting channel, the outer end of the liquid collecting hole is connected with a plug. In the above improved structure, easy and convenient collection of leakage liquid can be realized through the setting of the collection channel and the liquid collection hole.

As a further improvement, the elastic compensating assembly includes a plurality of second springs, and the bottom of the first installation groove is provided with a plurality of second spring holes uniformly distributed along the circumferential direction, and one end of each second spring is correspondingly fitted in the The end of each of the second spring holes is in contact with the bottom of the second spring hole, and the other end of each of the second springs is in contact with an end of the stationary ring away from the moving ring. In the above improved structure, multiple second springs are selected for the elastic compensator, and the compensation force is more stable; and the positioning of each second spring is realized through the second spring hole, which further enhances the stability of the second spring when it expands and contracts, and at the same time facilitates the second spring. The installation and positioning of the second spring.

As a further improvement, a gasket is provided at the end of the static ring away from the moving ring, and one end of the gasket abuts against the static end, and each of the ends of the second springs away from the spring hole is abut against the other end of the washer. In the above improved structure, the arrangement of the gasket structure effectively improves the stability of each second spring in the working state, thereby ensuring the stable sealing performance of the mechanical seal.

As a further improvement, the end of the gasket away from the static ring is provided with a plurality of positioning pins that are evenly divided along its circumference, and each of the positioning pins passes through each of the second springs until it is slidably inserted into the corresponding second spring. In the spring hole; the end of the gasket near the static ring is provided with a second anti-rotation pin, and the end of the static ring away from the moving end is provided with a second anti-rotation pin matched with the second anti-rotation pin groove. In the above improved structure, the setting of the positioning pin and the second release pin realizes the circumferential anti-rotation of the stationary ring, and the positioning pin is inserted in the inner hole of the second spring, which can also function as a positioning spring, so that the second The spring has better stability when compressed.

Description of drawings

Fig. 1 is a structural schematic diagram of a double-suction pump with a cartridge mechanical seal installed on a rotating shaft of the present invention;

FIG. 2 is an enlarged structure diagram at X in FIG. 1 .

Explanation of reference signs:

1. Shaft sleeve; 1.1. Limiting groove; 1.2. Mounting boss; 1.2.1. Moving ring mounting groove; 2. Gland; 2.1. First mounting groove; 2.2. Second mounting groove; 2.3. First spring Hole; 2.4, liquid collection hole; 2.5, second spring hole; 3, moving ring; 4, static ring; 4.1, second anti-rotation pin groove; 5, limit block; 6, throttle ring; 6.1, first Anti-rotation pin groove; 7. Press plate; 8. First anti-rotation pin; 9. First spring; 10. Collection channel; 11. Plug; 12. Second spring; 13. Gasket; 14. Locating pin; 15 , the second anti-rotation pin; 16, the connecting bolt; 17, the third turning pin; 18, the driving ring; 19, the driving screw.

detailed description

In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

In the description of the present utility model, it should be noted that unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be directly connected, or indirectly connected through an intermediary, and can be internally connected between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

As shown in Figure 1, the utility model provides a cartridge type mechanical seal for a double-suction pump, which includes a shaft sleeve 1 for fitting on the outside of the shaft of the double-suction pump. Cover 2 and gland 2 are mainly used to connect and fix the pump body; as shown in the figure, there are corresponding connecting bolts 16 on the gland 2. The body is connected and fixed.

Specifically, one end of the shaft sleeve 1 is provided with an integrally formed installation boss 1.2, and a moving ring installation groove 1.2.1 is opened on the installation boss 1.2, and a moving ring installation groove 1.2.1 is equipped with a The moving ring 3, and a corresponding sealing ring is provided between the radially outer end of the moving ring 3 and the moving ring installation groove 1.2.1, and there is also a seal ring at the bottom of the moving ring installation groove 1.2.1 to prevent the moving ring 3 from rotating in the circumferential direction. The third turning pin 17. In addition, one end of the gland 2 close to the moving ring 3 is equipped with a static ring 4, and the end of the static ring 4 away from the gland 2 is rotatably abutted against the moving ring 3 in the circumferential direction to form a sealing friction pair; the gland 2 The radial inner side of one end of the proximal moving ring 3 is provided with a first installation groove 2.1, and one end of the static ring 4 is slidably fitted in the first installation groove 2.1, and between the bottom of the first installation groove 2.1 and the static ring 4 Elastic compensating components are provided, and the end surface of the other end of the gland 2 is detachably connected with a plurality of limit blocks 5 distributed along the circumferential direction. The outer wall of the shaft sleeve 1 is provided with a limit groove 1.1, and the diameter of each limit block 5 is The inner ends are inserted and fitted in the limit groove 1.1, so that the shaft sleeve 1, the gland 2, the moving ring 3 and the static ring 4 are assembled into an integral structure, which is convenient for the mechanical seal to be assembled and disassembled in the pump body, and improves efficiency. Specifically, in the above structure, a driving ring 18 is provided at the end of the shaft sleeve 1 away from the moving ring 3, and a plurality of driving screws 19 distributed along the circumferential direction are provided on the driving ring 18. When the whole set of mechanical seal is installed in the pump body, The shaft sleeve 1 is fastened on the rotating shaft through the driving screw 19, and the gland 2 is connected and fixed with the pump body through the connecting bolt 16, that is, the working position of the mechanical seal has been limited, so the limit block 5 needs to be removed at this time, otherwise it will affect the performance of the mechanical seal. normal operation. Therefore, the limit block 5 in this structure actually plays a role when the product is pre-assembled to facilitate the overall installation; of course, when the mechanical seal needs to be disassembled, the limit block 5 can be installed again to facilitate the overall disassembly .

On the other hand, in the above-mentioned structure, the radial inner side of the end of the gland 2 away from the static ring 4 is also provided with a second installation groove 2.2, the second installation groove 2.2 is provided with a throttling ring 6, and the gland 2 is far away from the static ring 4 One end is provided with a pressure plate 7 for axially limiting the choke ring 6 . Specifically, one end of the choke ring 6 abuts against the pressure plate 7, an elastic member is provided between the bottom of the second installation groove 2.2 and the other end of the choke ring 6, and the end surfaces of the choke ring 6 abutting against the pressure plate 7 are uniform. In order to polish the sealing surface, the end surface of the throttle ring 6 and the end surface of the pressure plate 7 are closely attached to form a sealing surface under the action of the elastic member. Preferably, the choke ring 6 in this embodiment adopts a graphite ring, which facilitates its end face polishing.

In addition, in order to prevent the choke ring 6 from rotating under the rotation of the shaft sleeve 1, a first anti-rotation pin 8 is provided at the bottom of the second installation groove 2.2, and a first anti-rotation pin 8 is provided on the choke ring 6. Matching first anti-rotation pin groove 6.1.

As shown in Figure 1, the elastic member in this embodiment includes a plurality of first springs 9, and the bottom of the second installation groove 2.2 is provided with a plurality of first spring holes 2.3 equally divided along the circumferential direction, and one end of each first spring 9 is fitted In the first spring hole 2.3 and its end abuts against the bottom of the first spring hole 2.3, the other end of each first spring 9 abuts against the end of the throttle ring 6 away from the pressure plate 7. More specifically, there is a collection channel 10 between the circumferential outer wall of the throttle ring 6 and the circumferential side wall of the second installation groove 2.2, and the side wall of the gland 2 is provided with a radial connection to the collection channel 10 The liquid collection hole 2.4, the outer end of the liquid collection hole 2.4 is connected with a plug 11, once the friction pair leaks, the medium will enter the sealing cavity between the friction pair and the outer wall of the shaft sleeve 1, and under the action of the rotation of the mechanical seal The medium can be collected in the liquid collection hole 2.4 through the collection channel 10, and the leakage medium can be collected uniformly only by opening the plug 11 when the machine is shut down.

Moreover, in the above-mentioned structure, the elastic compensating assembly includes a plurality of second springs 12, and the bottom of the first installation groove 2.1 is provided with a plurality of second spring holes 2.5 uniformly distributed along the circumferential direction, and one end of each second spring 12 is correspondingly fitted in the The end of each second spring hole 2.5 is in contact with the bottom of the second spring hole 2.5, and the other end of each second spring 12 is in contact with the end of the stationary ring 4 away from the moving ring 3 .

As shown in Figures 1 and 2, the end of the static ring 4 away from the moving ring 3 is also provided with a gasket 13, and one end of the gasket 13 abuts against one end of the static ring 4, and the ends of each second spring 12 away from the spring hole 2.5 are It abuts against the other end of the gasket 13 . More specifically, the end of the gasket 13 away from the stationary ring 4 is provided with a plurality of positioning pins 14 equally divided along its circumference, and each positioning pin 14 passes through each second spring 12 until it is slidably inserted into the corresponding second spring hole 2.5. Inside, the end of the gasket 13 close to the static ring 4 is provided with a second anti-rotation pin 15 , and the end of the static ring 4 away from the moving ring 3 is provided with a second anti-rotation pin groove 4.1 fitted with the second anti-rotation pin 15 . In this structure, in order to optimize the structure, the number of the second anti-rotation pins 15 is at least two symmetrically arranged, and the second anti-rotation pins 15 can be directly integrally formed into the other end of the positioning pin 14 at the corresponding position.

In addition, as shown in Figure 1, in this embodiment, a corresponding flushing hole 2.6 is also provided on the circumferential outer wall of the gland 2, and the flushing hole 2.6 extends toward the medium end to the position of the sealing friction pair, and the flushing hole 2.6 The flushing liquid is injected into the middle to flush the position of the sealing friction pair, and the solid particles around the sealing friction pair are washed away in time to avoid damage to the sealing grinding surface; and the flushing liquid can also take away the friction heat in time to avoid the risk of thermal cracking of the sealing ring. Thereby improving the service life of the seal.

Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims (8)

1. A cartridge mechanical seal for a double-suction pump, comprising a shaft sleeve (1) and a gland (2) sleeved on the outside of the shaft sleeve (1), one end of the shaft sleeve (1) is equipped with A moving ring (3), the end of the gland (2) near the moving ring (3) is equipped with a static ring (4), and the end of the static ring (4) away from the gland (2) is connected to the The moving ring (3) is rotatably abutted in the circumferential direction, and it is characterized in that a first installation groove (2.1) is provided on the inner side of the gland (2) near one end of the moving ring (3) in the radial direction , one end of the static ring (4) is slidably fitted in the first installation groove (2.1), and a bottom of the first installation groove (2.1) and the static ring (4) are provided There is an elastic compensating component, the end surface of the other end of the gland (2) is detachably connected with a plurality of limit blocks (5) distributed along the circumferential direction, and the outer wall of the shaft sleeve (1) is provided with a limit groove (1.1), the radially inner ends of each of the limiting blocks (5) are inserted and fitted in the limiting grooves (1.1); the end of the gland (2) away from the static ring (4) There is also a second installation groove (2.2) on the radial inner side, and a throttling ring (6) is arranged in the second installation groove (2.2), and the gland (2) is far away from the static ring (4). One end is provided with a pressure plate (7) for axially limiting the throttle ring (6). 2. The cartridge mechanical seal for double suction pump according to claim 1, characterized in that: one end of the throttle ring (6) abuts against the pressure plate (7), and the second installation groove ( 2.2) There is an elastic member between the bottom of the throttle ring (6) and the other end of the throttle ring (6), and the end surfaces of the throttle ring (6) and the pressure plate (7) are all polished sealing surfaces. 3. The cartridge mechanical seal for double suction pump according to claim 2, characterized in that: the bottom of the second installation groove (2.2) is provided with a first anti-rotation pin (8), and the throttle ring ( 6) A first anti-rotation pin groove (6.1) matching the first anti-rotation pin (8) is opened on it. 4. The cartridge mechanical seal for double suction pump according to claim 2 or 3, characterized in that: the elastic member includes a plurality of first springs (9), and the bottom of the second installation groove (2.2) is provided with There are a plurality of first spring holes (2.3) equally divided along the circumferential direction, one end of each first spring (9) is fitted in the first spring hole (2.3) and the end is connected to the first spring hole (2.3) The bottom is in contact with each other, and the other end of each first spring (9) is in contact with the end of the throttle ring (6) away from the pressure plate (7). 5. The cartridge mechanical seal for double suction pump according to claim 3, characterized in that: the circumferential outer wall of the throttle ring (6) and the circumferential side wall of the second installation groove (2.2) There is a collection channel (10) between them, and a liquid collection hole (2.4) connected to the collection channel (10) in the radial direction is opened on the side wall of the gland (2), and the liquid collection hole ( 2.4) The outer end is connected with a plug (11). 6. The cartridge mechanical seal for double suction pump according to claim 1, characterized in that: the elastic compensating assembly includes a plurality of second springs (12), and the bottom of the first installation groove (2.1) is provided with There are a plurality of second spring holes (2.5) evenly distributed along the circumferential direction, and one end of each second spring (12) is fitted in each second spring hole (2.5) correspondingly, and the ends are connected with the second spring holes (2.5) The bottom is in contact with each other, and the other end of each second spring (12) is in contact with the end of the stationary ring (4) away from the moving ring (3). 7. The cartridge mechanical seal for double-suction pump according to claim 6, characterized in that: a gasket (13) is provided at the end of the static ring (4) away from the moving ring (3), so that One end of the gasket (13) abuts against one end of the static ring (4), and the end of each second spring (12) away from the second spring hole (2.5) is in contact with the gasket (13). ) butt against the other end. 8. The cartridge mechanical seal for double suction pump according to claim 7, characterized in that: the end of the gasket (13) away from the static ring (4) is provided with a plurality of positioning points equally divided along its circumference. Pins (14), each of the positioning pins (14) respectively passes through each of the second springs (12) until slidingly inserted in the corresponding second spring hole (2.5); the gasket (13) is close to the One end of the static ring (4) is provided with a second anti-rotation pin (15), and the end of the static ring (4) away from the moving ring (3) is provided with a second anti-rotation pin (15). the second anti-rotation pin groove (4.1).

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