CN219242276U - Mechanical seal of make-up water pump - Google Patents

Abstract

The utility model discloses a mechanical seal of a make-up water pump, which comprises a static ring assembly, a movable ring assembly, a gland assembly, a pump shaft and a locking assembly, wherein the static ring assembly and the movable ring assembly are contacted with the end face of the movable ring through a static ring so as to realize the purpose of dynamic seal of the end face; the movable ring assembly is mounted on the pump shaft; the movable ring assembly comprises a shaft sleeve, a shaft sleeve sealing ring is arranged on the shaft sleeve, and the shaft sleeve sealing ring respectively props against the pump shaft and the shaft sleeve to realize static seal and prevent medium from leaking through the shaft sleeve. The utility model can realize reliable operation of the water supplementing pump, safe and stable process and stable sealing effect.

Description

Mechanical seal of make-up water pump

Technical Field

The utility model relates to a mechanical seal in the field of nuclear power equipment, in particular to a mechanical seal for a make-up water pump.

Background

In a nuclear power system, a water supplementing system bears a plurality of important functions, wherein the water supplementing system comprises water supply for a unit under normal operation working conditions, water supply for a cooling water system of important and non-important users is carried out by water filling for a first loop and a second loop before the unit is started, the water supplementing system ensures that the number of the normal two loops is equivalent to 1% of the rated yield loss of a steam generator, and the number of the deaerators for a steam turbine unit is equivalent to 4-5% of the rated yield of the steam generator in an emergency. The water replenishing system is provided with 2 water replenishing pumps which are used for supplying normal water for the main condenser or flushing water for the pipeline before starting. Therefore, the water supplementing pump has important significance and function in a nuclear power related system, is an important ring for guaranteeing the stable operation of the nuclear power system, and can bring unexpected serious consequences once the water supplementing pump cannot normally operate due to the failure of a mechanical seal. Therefore, the sealing performance and the service life of the mechanical seal of the make-up water pump play a decisive role in the safety and reliability of the make-up water pump. Therefore, how to ensure the stability, reliability and convenient installation of the operation of the mechanical seal and reduce the damage caused by assembly becomes a key technical difficulty.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a mechanical seal of a make-up water pump.

In order to solve the technical problems, the technical scheme provided by the utility model is that the mechanical seal of the water supplementing pump is as follows: the dynamic seal device comprises a static ring assembly, a dynamic ring assembly, a gland assembly, a pump shaft and a locking assembly, wherein the static ring assembly and the dynamic ring assembly are contacted with the end face of the dynamic ring through the static ring so as to realize the purpose of dynamic seal of the end face; the movable ring assembly is mounted on the pump shaft; the movable ring assembly comprises a shaft sleeve, a shaft sleeve sealing ring is arranged on the shaft sleeve, and the shaft sleeve sealing ring respectively props against the pump shaft and the shaft sleeve to realize static seal and prevent medium from leaking through the shaft sleeve.

Further, the movable ring assembly further comprises a movable ring sealing ring, a movable ring, a clamping ring and a transmission block; two lugs and a thread structure are processed at one end of the small diameter of the shaft sleeve, the two lugs are respectively inserted into the strip-shaped grooves of the pump shaft, and the shaft sleeve and the pump shaft are circumferentially fixed by the two lugs; a sealing ring groove, a clamping ring groove and a semicircular groove structure for installing a transmission block are processed at one end of the large diameter of the shaft sleeve; two symmetrical planes are machined on the side face of the movable ring, the movable ring is arranged in the shaft sleeve, and the bottom face of the movable ring is contacted with the shaft sleeve; the transmission block is of a semicircular structure, is arranged in a semicircular groove of the shaft sleeve, and one side of the plane of the transmission block is matched with the plane on the movable ring, so that the movable ring and the shaft sleeve can be kept circumferentially fixed; the movable ring sealing ring is arranged in the shaft sleeve sealing ring groove, and two ends of the movable ring sealing ring respectively prop against the movable ring and the shaft sleeve, so that static sealing is realized, and medium leakage from the movable ring sealing ring is prevented; the clamping ring is arranged in the shaft sleeve clamping ring groove, so that the movable ring is kept axially positioned, and damage caused by falling of the movable ring in the assembly process of the mechanical seal of the make-up water pump can be prevented.

Further, the static ring assembly comprises a static ring, a static ring seat sealing ring, a static ring sealing ring, a clamping ring and a transmission block; the small-diameter end of the static ring seat is provided with a sealing ring groove, the large-diameter end of the static ring seat is provided with a sealing ring groove, a clamping ring groove and a semicircular groove structure for installing a transmission block, and the static ring seat is arranged on the spring seat assembly and is inserted into the spring seat assembly through the small-diameter end of the static ring seat to be matched with the spring seat assembly; two symmetrical planes are processed on the side surface of the static ring, and the static ring is arranged in the static ring seat, and the bottom surface of the static ring is contacted with the static ring seat; the static ring sealing ring is arranged in a sealing ring groove of the static ring seat, and two ends of the static ring sealing ring respectively prop against the static ring and the static ring seat, so that static sealing is realized, and medium leakage from the static ring sealing ring is prevented; the clamping ring is arranged in the clamping ring groove of the static ring seat, so that the static ring is axially positioned, and damage caused by falling of the static ring in the assembly process of the mechanical seal of the make-up water pump can be prevented; the seal ring of the static ring seat is arranged in a seal ring groove at one end of the small diameter of the static ring seat, and can ensure that the static ring seat can axially move while playing a sealing role.

Further, the gland assembly comprises a gland, a spring, a threaded cylindrical pin, a bolt A, a positioning block and a bolt C; the gland is provided with a plurality of spring holes, threaded holes and through holes, and is arranged on the water supplementing pump through a bolt C; the spring is arranged in a spring hole on the gland, and two ends of the spring respectively prop against the gland and the static ring seat to provide spring force required by the end face of the friction pair; the threaded cylindrical pin is arranged on the gland and is connected and fixed in a threaded mode, and the smooth end of the threaded cylindrical pin stretches into the static ring seat so that the static ring seat and the gland are kept circumferentially fixed; the positioning block is arranged on the gland through the bolt A, one end, far away from the bolt A, of the positioning block is inserted into a groove of the shaft sleeve, and the shaft sleeve and the gland are axially positioned, so that the integrated function is realized.

Further, the locking assembly comprises a locking ring A, a locking ring B, a locking washer and a bolt B; the locking ring A is arranged at the threaded part of the end part of the shaft sleeve in a threaded connection mode; the locking ring B is arranged at a threaded part on the pump shaft in a threaded connection mode; the bolt B is connected with the threaded hole of the locking ring A through the hole of the locking ring B, and finally the pump shaft and the shaft sleeve can be fixed; the locking washer is arranged below the bolt B, so that the bolt B can be prevented from loosening.

Compared with the prior art, the utility model has the advantages that: the utility model can realize reliable operation of the water supplementing pump, safe and stable process and stable sealing effect.

Drawings

FIG. 1 is a schematic illustration of the mechanical seal of a make-up water pump of the present utility model.

Fig. 2 is a schematic structural view of a shaft sleeve of a mechanical seal of a make-up water pump according to the present utility model.

Fig. 3 is a schematic structural view of a dynamic ring of a mechanical seal of a make-up water pump according to the present utility model.

Fig. 4 is a schematic structural view of a driving block of a mechanical seal of a make-up water pump according to the present utility model.

As shown in the figure: 1. the device comprises a shaft sleeve, a 2, a moving ring, a 3, a stationary ring, a 4, a stationary ring seat, a 5, a stationary ring seat sealing ring, a 6, a gland, a 7, a positioning block, a8, bolts A,9, locking rings A,10, locking rings B,11, locking washers, 12, bolts B,13, threaded cylindrical pins, 14, a stationary ring sealing ring, 15, a clamping ring, 16, a shaft sleeve sealing ring, 17, a moving ring sealing ring, 18, bolts C,19, a transmission block, 20, a spring, 21 and a pump shaft.

Detailed Description

The mechanical seal of the water supplementing pump is further described in detail below with reference to the accompanying drawings.

1-4, a mechanical seal of a make-up water pump comprises a static ring assembly, a dynamic ring assembly, a gland assembly, a pump shaft 21 and a locking assembly, wherein the static ring assembly and the dynamic ring assembly are contacted with the end face of the dynamic ring 2 through a static ring 3 so as to realize the purpose of dynamic sealing of the end face; the moving ring assembly is mounted on the pump shaft 21; the movable ring assembly comprises a shaft sleeve 1, a shaft sleeve sealing ring 16 is arranged on the shaft sleeve 1, and the shaft sleeve sealing ring 16 respectively abuts against a pump shaft 21 and the shaft sleeve 1 to realize static sealing and prevent medium from leaking through the shaft sleeve.

The movable ring assembly further comprises a movable ring sealing ring 17, a movable ring 2, a clamping ring 15 and a transmission block 19; two lugs and a thread structure are processed at one end of the small diameter of the shaft sleeve 1, the two lugs are respectively inserted into the strip-shaped grooves of the pump shaft 21, and the shaft sleeve 1 and the pump shaft 21 are circumferentially fixed by the two lugs; a sealing ring groove, a clamping ring groove and a semicircular groove structure for installing the transmission block 19 are processed at one end of the large diameter of the shaft sleeve 1; two symmetrical planes are machined on the side face of the movable ring 2, the movable ring 2 is installed in the shaft sleeve 1, and the bottom face of the movable ring 2 is in contact with the shaft sleeve 1; the transmission block 19 is of a semicircular structure, the transmission block 19 is arranged in a semicircular groove of the shaft sleeve 1, one side of the plane of the transmission block is matched with the plane on the moving ring 2, and the moving ring 2 and the shaft sleeve 1 can be kept circumferentially fixed; the movable ring sealing ring 17 is arranged in a sealing ring groove of the shaft sleeve 1, and two ends of the movable ring sealing ring respectively prop against the movable ring 2 and the shaft sleeve 1 to realize static sealing and prevent medium from leaking from the movable ring sealing ring; the clamping ring 15 is arranged in a clamping ring groove of the shaft sleeve 1, so that the movable ring 2 is kept axially positioned, and damage caused by falling of the movable ring 2 in the assembly process of the mechanical seal of the make-up water pump can be prevented.

The static ring assembly comprises a static ring 3, a static ring seat 4, a static ring seat sealing ring 5, a static ring sealing ring 14, a clamping ring 15 and a transmission block 19; a sealing ring groove is formed in one small-diameter end of the static ring seat 4, a sealing ring groove, a clamping ring groove and a semicircular groove structure for installing the transmission block 19 are formed in one large-diameter end of the static ring seat 4, and the static ring seat 4 is installed on the spring seat assembly and is inserted into the spring seat assembly through one small-diameter end of the static ring seat to be matched with the spring seat assembly; two symmetrical planes are machined on the side face of the stationary ring 3, the stationary ring 3 is arranged in the stationary ring seat 4, and the bottom face of the stationary ring 3 is contacted with the stationary ring seat 4; the static ring sealing ring 14 is arranged in a sealing ring groove of the static ring seat 4, and two ends of the static ring sealing ring respectively prop against the static ring 3 and the static ring seat 4 to realize static sealing and prevent medium from leaking from the static ring seat; the clamping ring 15 is arranged in a clamping ring groove of the static ring seat 4, so that the static ring 3 is kept axially positioned, and damage caused by falling off of the static ring 3 in the assembly process of the mechanical seal of the make-up water pump can be prevented; the static ring seat sealing ring 5 is arranged in a sealing ring groove at one end of the small diameter of the static ring seat 4, and can ensure that the static ring seat 4 can axially move while playing a sealing role.

The gland assembly comprises a gland 6, a spring 20, a threaded cylindrical pin 13, a bolt A8, a positioning block 7 and a bolt C18; the gland 6 is provided with a plurality of spring holes, threaded holes and through holes, and the gland 6 is arranged on the water supplementing pump through a bolt C18; the spring 20 is arranged in a spring hole on the gland 6, and two ends of the spring 20 respectively prop against the gland 6 and the static ring seat 4 to provide spring force required by the end face of the friction pair; the threaded cylindrical pin 13 is arranged on the gland 6 and is connected and fixed in a threaded mode, and the smooth end of the threaded cylindrical pin 13 extends into the static ring seat 4, so that the static ring seat 4 and the gland 6 are kept circumferentially fixed; the positioning block 7 is arranged on the gland 6 through a bolt A8, one end, far away from the bolt A8, of the positioning block 7 is inserted into a groove of the shaft sleeve 1, and the shaft sleeve 1 and the gland 6 are axially positioned to realize the function of container type.

The locking assembly comprises a locking ring A9, a locking ring B10, a locking washer 11 and a bolt B12; the locking ring A9 is arranged at the threaded part of the end part of the shaft sleeve 1 in a threaded connection mode; the locking ring B10 is arranged at a threaded part on the pump shaft 21 in a threaded connection mode; the bolt B12 is connected with a threaded hole of the locking ring A9 through a hole of the locking ring B10, and finally the pump shaft 21 and the shaft sleeve 1 can be fixed; the locking washer 11 is installed under the bolt B12, and prevents the bolt B12 from loosening.

The utility model works as follows:

after the mechanical seal of the make-up water pump is arranged on the equipment, the positioning block 7 is taken down to be in a working state. The shaft sleeve sealing ring 16, the movable ring sealing ring 17, the static ring sealing ring 14 and the static ring seat sealing ring 5 play a role in static sealing and prevent the medium from leaking out from the places during operation. The movable ring assembly and the pump shaft 21 rotate simultaneously, the stationary ring 3 is kept circumferentially fixed, and the two rings realize a sealing effect in a mode of end face contact under the action of a spring.

The utility model comprises the following steps: 1. compared with the traditional pin or key, the lug type of the end face of the mechanical seal shaft sleeve of the make-up water pump can transmit larger torque, has higher strength and increases the reliability of mechanical seal; 2. the small diameter end of the mechanical seal static ring seat of the make-up water pump is designed with a section of conical structure, and the structure can ensure that the static ring seat is not easy to be blocked in the running process of equipment, so that the end face of the friction pair can always obtain stable spring force, and the sealing performance is good. 3. The semicircular design of the transmission block can ensure that the contact area between the transmission block and the movable ring and the stationary ring is larger, and larger torque can be transmitted without damaging the friction pair.

The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims (5)

1. The utility model provides a make-up water pump mechanical seal, includes quiet ring subassembly, moving ring subassembly, gland subassembly, pump shaft (21), locking subassembly, its characterized in that: the static ring assembly and the dynamic ring assembly are contacted with the end face of the dynamic ring (2) through the static ring (3) so as to realize the purpose of dynamic sealing of the end face; the movable ring assembly is mounted on the pump shaft (21); the movable ring assembly comprises a shaft sleeve (1), a shaft sleeve sealing ring (16) is arranged on the shaft sleeve (1), and the shaft sleeve sealing ring (16) respectively props against the pump shaft (21) and the shaft sleeve (1) to realize static sealing and prevent medium from leaking through the shaft sleeve.

2. The make-up water pump mechanical seal of claim 1, wherein: the movable ring assembly further comprises a movable ring sealing ring (17), a movable ring (2), a clamping ring (15) and a transmission block (19); two lugs and a thread structure are machined at one end of the small diameter of the shaft sleeve (1), the two lugs are respectively inserted into the strip-shaped grooves of the pump shaft (21), and the shaft sleeve (1) and the pump shaft (21) are circumferentially fixed by the two lugs; a sealing ring groove, a clamping ring groove and a semicircular groove structure for installing a transmission block (19) are processed at one end of the large diameter of the shaft sleeve (1); two symmetrical planes are machined on the side face of the movable ring (2), the movable ring (2) is installed in the shaft sleeve (1), and the bottom face of the movable ring is in contact with the shaft sleeve (1); the transmission block (19) is of a semicircular structure, the transmission block (19) is arranged in a semicircular groove of the shaft sleeve (1) and one side of the plane of the transmission block is matched with the plane of the movable ring (2), so that the movable ring (2) and the shaft sleeve (1) can be kept circumferentially fixed; the movable ring sealing ring (17) is arranged in a sealing ring groove of the shaft sleeve (1) and two ends of the movable ring sealing ring respectively prop against the movable ring (2) and the shaft sleeve (1), so that static sealing is realized, and medium leakage from the movable ring sealing ring is prevented; the clamping ring (15) is arranged in a clamping ring groove of the shaft sleeve (1), so that the movable ring (2) is kept axially positioned, and damage caused by falling off of the movable ring (2) in the assembly process of the mechanical seal of the make-up water pump can be prevented.

3. The make-up water pump mechanical seal of claim 1, wherein: the static ring assembly comprises a static ring (3), a static ring seat (4), a static ring seat sealing ring (5), a static ring sealing ring (14), a clamping ring (15) and a transmission block (19); a sealing ring groove is formed in one small-diameter end of the static ring seat (4), a sealing ring groove, a clamping ring groove and a semicircular groove structure for installing a transmission block (19) are formed in one large-diameter end of the static ring seat (4), and the static ring seat (4) is installed on the spring seat assembly and is inserted into the spring seat assembly through one small-diameter end of the static ring seat to be matched with the spring seat assembly; two symmetrical planes are machined on the side face of the stationary ring (3), the stationary ring (3) is arranged in the stationary ring seat (4), and the bottom face of the stationary ring is contacted with the stationary ring seat (4); the static ring sealing ring (14) is arranged in a sealing ring groove of the static ring seat (4) and two ends of the static ring sealing ring respectively prop against the static ring (3) and the static ring seat (4) to realize static sealing and prevent medium from leaking from the static ring seat; the clamping ring (15) is arranged in a clamping ring groove of the static ring seat (4) to enable the static ring (3) to be axially positioned, so that damage caused by falling off of the static ring (3) in the assembly process of the mechanical seal of the make-up water pump can be prevented; the static ring seat sealing ring (5) is arranged in a sealing ring groove at one small-diameter end of the static ring seat (4), and can ensure that the static ring seat (4) can axially move while playing a sealing role.

4. A make-up water pump mechanical seal as defined in claim 3, wherein: the gland assembly comprises a gland (6), a spring (20), a threaded cylindrical pin (13), a bolt A (8), a positioning block (7) and a bolt C (18); a plurality of spring holes, threaded holes and through holes are formed in the gland (6), and the gland (6) is mounted on the water supplementing pump through a bolt C (18); the spring (20) is arranged in a spring hole on the gland (6), and two ends of the spring (20) respectively prop against the gland (6) and the static ring seat (4) to provide spring force required by the end face of the friction pair; the threaded cylindrical pin (13) is arranged on the gland (6) and is connected and fixed in a threaded mode, and the smooth end of the threaded cylindrical pin (13) stretches into the static ring seat (4) so that the static ring seat (4) and the gland (6) are kept circumferentially fixed; the positioning block (7) is arranged on the gland (6) through the bolt A (8), one end, far away from the bolt A (8), of the positioning block (7) is inserted into a groove of the shaft sleeve (1), and the shaft sleeve (1) and the gland (6) are axially positioned to realize the function of container type.

5. A make-up water pump mechanical seal as defined in claim 2, wherein: the locking assembly comprises a locking ring A (9), a locking ring B (10), a locking washer (11) and a bolt B (12); the locking ring A (9) is arranged at the threaded part of the end part of the shaft sleeve (1) in a threaded connection mode; the locking ring B (10) is arranged at a threaded part on the pump shaft (21) in a threaded connection mode; the bolt B (12) is connected with the threaded hole of the locking ring A (9) through the hole of the locking ring B (10), and finally the pump shaft (21) and the shaft sleeve (1) can be fixed; the locking washer (11) is installed under the bolt B (12) and can prevent the bolt B (12) from loosening.

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