CN216742146U

CN216742146U - Mechanical seal of high-flow charging pump

Info

Publication number: CN216742146U
Application number: CN202123372715.4U
Authority: CN
Inventors: 孙恺阳; 张微; 严巍峰; 赵庆玉; 安宁; 马爱芹
Original assignee: Chengdu Longyuan Keneng Mechanical Equipment Co ltd
Current assignee: Chengdu Longyuan Keneng Mechanical Equipment Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-14
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a high-flow mechanical seal for charging a pump, which comprises a compensation ring assembly, a non-compensation ring assembly, a spring seat assembly, a mandrel, a shaft sleeve and a locking assembly, wherein the compensation ring assembly is in contact with the non-compensation ring assembly through a compensation ring and the end surface of the non-compensation ring; the mechanical seal also comprises a clamping ring, an anti-rotation pin and a cylindrical pin. The utility model has convenient installation, reliable operation of the large-flow charging pump, safe and stable process and stable sealing effect.

Description

Mechanical seal of high-flow charging pump

Technical Field

The utility model relates to a mechanical seal in the field of nuclear power equipment, in particular to a high-flow pump-charging mechanical seal.

Background

The charging pump of the nuclear power station has complex functions in a reactor coolant system (a primary circuit), and the charging pump must be operated when the absolute pressure of the primary circuit in the nuclear power station with the level of million kilowatts is higher than 0.3 MPa. The upper filling pump is required to supplement upper filling water containing boric acid for a loop when the reactor normally operates, so as to stabilize the pressure of a loop system. And the upper charge pump needs to provide cooling water for mechanical seals for 3 main pumps, so that the normal work of the mechanical seals of the main pumps is ensured, and the leakage of radioactive primary loop water in the main pumps is prevented. When a primary loop has loss of coolant accidents such as a breach, the charging pump operates under a high-pressure safety injection working condition, and high-concentration boric acid water in the reactor refueling water tank is injected into the primary loop to control the reaction.

The above introduction of the charging pump fully reflects the important significance and function of the overshoot, and once the charging pump fails to stop, unexpected serious consequences are brought. Therefore, the sealing performance and the service life of the mechanical seal of the charging pump play a determining role in the safety and the reliability of the charging pump. In the prior art, the mechanical seal structure of the charging pump is complex, the assembly process is difficult, and the probability of artificially damaging parts is easily increased in the installation process. The compensating ring seat needs to frequently float in the using process to ensure the normal work of the end face of the friction pair, so that the compensating ring seat and the spring seat can be damaged due to long-time contact friction with the O-shaped ring, and the sealing at the position possibly fails. In addition, the prior art designs of locking devices used to secure the sleeve to the spindle generally utilize set screws for tightening, but over the long term have suffered damage to the surface of the spindle and potential slip. Therefore, how to ensure the stable operation of the mechanical seal and the convenient installation and reduction of the damage caused by the assembly become key technical difficulties.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical defects and provide a mechanical seal for a high-flow pump charging.

In order to solve the technical problems, the technical scheme provided by the utility model is a mechanical seal for a high-flow charging pump, which comprises the following steps: the compensation ring assembly is arranged on the mandrel, a shaft sleeve O-shaped ring is arranged in the shaft sleeve, and the shaft sleeve O-shaped ring is arranged on the shaft sleeve and respectively propped against the mandrel and the shaft sleeve; the mechanical seal also comprises a clamping ring, an anti-rotation pin and a cylindrical pin.

Furthermore, the non-compensation ring assembly comprises a shaft sleeve, a non-compensation ring O-shaped ring and a non-compensation ring, the shaft sleeve is arranged on the mandrel and is circumferentially fixed with the mandrel through a cylindrical pin, the non-compensation ring is arranged in the shaft sleeve and is circumferentially fixed through an anti-rotation pin, the non-compensation ring O-shaped ring is arranged in a shaft sleeve groove, two ends of the non-compensation ring O-shaped ring respectively abut against the non-compensation ring and the shaft sleeve, and the clamping ring is arranged in a shaft sleeve clamping ring groove to enable the non-compensation ring to be axially positioned.

Furthermore, the compensating ring assembly comprises a compensating ring, a compensating ring seat, an O-shaped compensating ring seat and an O-shaped compensating ring, the compensating ring is installed on the compensating ring seat and is circumferentially fixed through an anti-rotating pin, the O-shaped compensating ring is installed in a compensating ring seat groove, two ends of the O-shaped compensating ring respectively abut against the compensating ring and the compensating ring seat, and the clamping ring is installed in a clamping ring groove of the compensating ring seat, so that the compensating ring is axially positioned.

Furthermore, the spring seat assembly comprises a spring seat, a plurality of springs, a spring seat O-shaped ring, a guide pin, a gland, a bolt A, a bolt C and a positioning block, wherein two ends of the compensation ring seat O-shaped ring respectively abut against the compensation ring seat and the spring seat, the springs are arranged in holes of the spring seat, two ends of each spring respectively abut against the spring seat and the compensation ring seat, the multi-spring structure enables the pressure of the end face of the friction pair to be uniform and more stable, and good operation state is guaranteed, the guide pin is arranged on the spring seat, the guide pin is respectively clamped in hole grooves at two ends of the compensation ring seat, so that the compensation ring seat and the spring seat are circumferentially kept fixed and axially movable, the gland is arranged on the spring seat and fastened by the bolt C, the positioning block is arranged on the gland and fixed by the bolt A, one end of the positioning block, which is far away from the bolt A, is embedded in a ring groove of the shaft sleeve, thereby realize the function of collection dress formula for the assembly process is simpler, avoids the additional influence that probably causes in the assembly process, the inslot of spring holder O shape circle is installed in the spring holder.

Further, the locking assembly comprises a locking ring A, a locking ring B, a bolt B and a locking washer, wherein the locking ring B is arranged at the threaded part of the end part of the shaft sleeve in a threaded connection mode, the locking ring A is arranged at the threaded part of the end part of the spindle in a threaded connection mode, the bolt B is connected with the threaded hole of the locking ring B through the hole of the locking ring A, meanwhile, the bolt can be prevented from loosening under the action of the locking washer, and finally, the spindle and the shaft sleeve can be fixed.

Compared with the prior art, the utility model has the advantages that: the utility model has convenient installation, can ensure that the large-flow charging pump runs reliably, and has safe and stable process and stable sealing effect.

Drawings

Fig. 1 is a schematic structural diagram of a high-flow pump-up mechanical seal according to the utility model.

As shown in the figure: 1. the bearing comprises a bearing sleeve, 2, a bearing sleeve O-shaped ring, 3, a non-compensating ring, 4, a compensating ring, 5, a compensating ring seat, 6, a spring seat, 7, a gland, 8, bolts A, 9, a positioning block, 10, bolts B, 11, locking gaskets, 12, locking rings A, 13, a cylindrical pin, 14, locking rings B, 15, a compensating ring seat O-shaped ring, 16, a spring seat O-shaped ring, 17, a spring, 18, a compensating ring O-shaped ring, 19, a guide pin, 20, a clamping ring, 21, an anti-rotation pin, 22, a non-compensating ring O-shaped ring, 23, a mandrel, 24 and a bolt C.

Detailed Description

The high flow rate pump-up mechanical seal of the present invention is further described in detail with reference to the accompanying drawings.

With reference to the attached drawing 1, the high-flow mechanical seal for the pump charging comprises a compensation ring assembly, a non-compensation ring assembly, a spring seat assembly, a mandrel 23, a shaft sleeve 1 and a locking assembly, wherein the compensation ring assembly is in contact with the non-compensation ring assembly through a compensation ring 4 and the end face of a non-compensation ring 3, the non-compensation ring assembly is installed on the mandrel 23, a shaft sleeve O-shaped ring 2 is arranged in the shaft sleeve 1, and the shaft sleeve O-shaped ring 2 is installed on the shaft sleeve 1 and respectively props against the mandrel 23 and the shaft sleeve 1; the mechanical seal further comprises a clamping ring 20, an anti-rotation pin 21 and a cylindrical pin 13.

The non-compensation ring assembly comprises a shaft sleeve 1, a non-compensation ring O-shaped ring 22 and a non-compensation ring 3, wherein the shaft sleeve 1 is arranged on a mandrel 23 and is circumferentially fixed with the mandrel 23 through a cylindrical pin 13, the non-compensation ring 3 is arranged in the shaft sleeve 1 and is circumferentially fixed through an anti-rotation pin 21, the non-compensation ring O-shaped ring 22 is arranged in a groove of the shaft sleeve 1, two ends of the non-compensation ring O-shaped ring 22 respectively abut against the non-compensation ring 3 and the shaft sleeve 1, and a clamping ring 20 is arranged in a clamping ring groove of the shaft sleeve 1 to enable the non-compensation ring 3 to be axially positioned.

The compensating ring assembly comprises a compensating ring 4, a compensating ring seat 5, an O-shaped ring 15 of the compensating ring seat and an O-shaped ring 18 of the compensating ring, wherein the compensating ring 4 is installed on the compensating ring seat 5 and is circumferentially fixed through an anti-rotating pin 21, the O-shaped ring 18 of the compensating ring is installed in a groove of the compensating ring seat 5, two ends of the O-shaped ring respectively abut against the compensating ring 4 and the compensating ring seat 5, and a clamping ring 20 is installed in a clamping ring groove of the compensating ring seat 5 to enable the compensating ring 4 to be axially positioned.

The spring seat assembly comprises a spring seat 6, a plurality of springs 17, a spring seat O-shaped ring 16, a guide pin 19, a gland 7, a bolt A8, a bolt C24 and a positioning block 9, wherein two ends of a compensating ring seat O-shaped ring 15 respectively abut against a compensating ring seat 5 and the spring seat 6, the springs 17 are installed in a hole of the spring seat 6, two ends of each spring 17 respectively abut against the spring seat 6 and the compensating ring seat 5, the structure of the springs enables the pressure of the end face of a friction pair to be uniform and more stable, and a good operation state is guaranteed, the guide pin 19 is installed on the spring seat 6, the guide pin 19 is respectively clamped in a hole groove at two ends of the compensating ring seat 5, so that the compensating ring seat 5 and the spring seat 6 are circumferentially kept fixed and axially movable, the gland 7 is installed on the spring seat 6 and fastened through the bolt C24, the positioning block 9 is installed on the gland 7 and fixed through the bolt A8, one end of the positioning block 9, which is far away from the bolt A8, is embedded into an annular groove of the shaft sleeve 1, so that a container type function is realized, the assembly process is simpler, additional influence possibly caused in the assembly process is avoided, and the spring seat O-shaped ring 16 is arranged in a groove of the spring seat 6.

The locking assembly comprises a locking ring A12, a locking ring B14, a bolt B10 and a locking washer 11, wherein the locking ring B14 is arranged at the threaded part at the end part of the shaft sleeve 1 in a threaded connection mode, the locking ring A12 is arranged at the threaded part at the end part of the mandrel 23 in a threaded connection mode, the bolt B10 is connected with the threaded hole of the locking ring B14 through the hole of the locking ring A12, meanwhile, the bolt can be prevented from loosening under the action of the locking washer 11, and finally, the spindle 23 and the shaft sleeve 1 can be fixed.

The utility model works as follows: before operation, the compensating ring assembly may be assembled with the spring seat assembly by connecting the guide pins 19, at which point the springs 17 may be partially pre-compressed. Then, the non-compensation ring assembly and the spring seat assembly are assembled and fixed through the positioning block 9, the end faces of the friction pairs are in contact at the moment, the spring 17 is in a pre-compression state, the friction pairs are prevented from being damaged in the subsequent assembling process, and meanwhile, the assembling process can be simplified, so that the non-compensation ring assembly and the spring seat assembly are simple and safe. After the integral assembly is arranged on the charging pump, the positioning block 9 is detached, and the working state is achieved.

When the static sealing device works, the shaft sleeve O-shaped ring 2, the compensating ring O-shaped ring 18, the non-compensating ring O-shaped ring 22, the spring seat O-shaped ring 16 and the compensating ring seat O-shaped ring 15 are circumferentially fixed, and the static sealing effect is achieved. The non-compensating ring assembly and the mandrel 23 rotate simultaneously, the compensating ring 4 is fixed in the circumferential direction, and the two rings achieve a sealing effect in an end face contact mode. The compensation ring 4 can continuously compensate under the action of the spring 17 in the process so as to achieve the effect of long-term sealing. Because the rotating speed of the mechanical seal of the charging pump is higher, the static structure of the spring 17 can ensure that the spring 17 is not influenced by centrifugal force and is more stable.

The utility model has the beneficial effects that:

1. the mechanical seal of the charging pump is designed into a cartridge type, and the charging pump has the advantages of convenience and rapidness in the installation process, accurate assembly position and avoidance of colliding with the surface of a friction pair in the assembly process;

2. the mechanical seal of the upper charging pump is designed to be a multi-spring and spring static structure. Because the high-pressure safety injection pump mechanical seal has higher rotating speed, the static structure of the spring can prevent the spring from being influenced by centrifugal force and reduce the influence of scouring generated by a medium in the rotating process. The multi-spring structure can also enable the end face of the friction pair to be stressed uniformly, and avoid the problem that the end face of the friction pair is not in a good wear state due to non-uniform elasticity.

3. The mechanical seal guide pin of the charging pump adopts a threaded pin form with steps, is simple and convenient to install, can play a role of pre-compressing a spring in the installation process, and can play a role of circumferentially fixing the non-compensation ring seat.

4. The non-compensation ring seat and the spring seat of the upper charge pump mechanical seal are sprayed with hard alloy coatings at specified positions, the abrasion resistance of the position is greatly improved after the spraying, and the problem of sealing failure caused by abrasion of an O-shaped ring is solved.

5. The unique locking design of the mechanical seal of the upper charging pump can realize that the transmitted torque is larger while the surface of the shaft sleeve is not damaged, and the risk of slipping is reduced.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a fill pump mechanical seal in large-traffic, includes compensating ring subassembly, non-compensating ring subassembly, spring holder subassembly, dabber (23), axle sleeve (1), locking Assembly, its characterized in that: the compensating ring assembly is in contact with the end face of the non-compensating ring assembly (3) through a compensating ring (4), the non-compensating ring assembly is arranged on a mandrel (23), a shaft sleeve O-shaped ring (2) is arranged in the shaft sleeve (1), and the shaft sleeve O-shaped ring (2) is arranged on the shaft sleeve (1) and respectively props against the mandrel (23) and the shaft sleeve (1);

the mechanical seal further comprises a clamping ring (20), an anti-rotation pin (21) and a cylindrical pin (13).

2. A high flow rate pump-up mechanical seal according to claim 1, wherein: the non-compensation ring assembly comprises a shaft sleeve (1), a non-compensation ring O-shaped ring (22) and a non-compensation ring (3), wherein the shaft sleeve (1) is installed on a mandrel (23) and is circumferentially fixed with the mandrel (23) through a cylindrical pin (13), the non-compensation ring (3) is installed in the shaft sleeve (1) and is circumferentially fixed through an anti-rotation pin (21), the non-compensation ring O-shaped ring (22) is installed in a groove of the shaft sleeve (1), two ends of the non-compensation ring O-shaped ring (22) respectively abut against the non-compensation ring (3) and the shaft sleeve (1), and a clamping ring (20) is installed in a clamping ring groove of the shaft sleeve (1) to enable the non-compensation ring (3) to be axially positioned.

3. A high flow rate pump-up mechanical seal according to claim 1, wherein: the compensating ring assembly comprises a compensating ring (4), a compensating ring seat (5), an O-shaped ring (15) of the compensating ring seat and an O-shaped ring (18) of the compensating ring seat, wherein the compensating ring (4) is installed on the compensating ring seat (5) and is circumferentially fixed through an anti-rotation pin (21), the O-shaped ring (18) of the compensating ring is installed in a groove of the compensating ring seat (5), two ends of the O-shaped ring are respectively abutted against the compensating ring (4) and the compensating ring seat (5), and a clamping ring (20) is installed in a clamping ring groove of the compensating ring seat (5), so that the compensating ring (4) is axially positioned.

4. A high flow rate pump-up mechanical seal according to claim 3, wherein: the spring seat assembly comprises a spring seat (6), a plurality of springs (17), a spring seat O-shaped ring (16), a guide pin (19), a gland (7), a bolt A (8), a bolt C (24) and a positioning block (9), wherein two ends of a compensation ring seat O-shaped ring (15) respectively abut against a compensation ring seat (5) and a spring seat (6), the springs (17) are installed in holes of the spring seat (6), two ends of the springs (17) respectively abut against the spring seat (6) and the compensation ring seat (5), the friction pair end surface pressure is uniform and more stable due to the multi-spring structure, a good running state is guaranteed, the guide pin (19) is installed on the spring seat (6), and the guide pin (19) is respectively clamped in hole grooves at two ends of the compensation ring seat (5), so that the compensation ring seat (5) and the spring seat (6) are circumferentially fixed and axially movable, gland (7) are installed on spring holder (6), through bolt C (24) fastening, install on gland (7) locating piece (9), through bolt A (8) are fixed, keep away from in the ring channel of bolt A (8) one end embedding axle sleeve (1) of locating piece (9) to realize the function of collection dress formula, make assembly process simpler, avoid the additional influence that probably causes in the assembly process, the inslot in spring holder (6) is installed in spring holder O shape circle (16).

5. A high flow rate pump-up mechanical seal according to claim 1, wherein: the locking assembly comprises a locking ring A (12), a locking ring B (14), a bolt B (10) and a locking washer (11), wherein the locking ring B (14) is mounted at the threaded part of the end part of the shaft sleeve (1) in a threaded connection mode, the locking ring A (12) is mounted at the threaded part of the end part of the mandrel (23) in a threaded connection mode, the bolt B (10) is connected with the threaded hole of the locking ring B (14) through the hole of the locking ring A (12), meanwhile, the bolt can be prevented from loosening under the action of the locking washer (11), and finally, the mandrel (23) and the shaft sleeve (1) can be fixed.