CN114542608A - A nuclear power plant containment gate drive shaft penetration - Google Patents

Abstract

The invention belongs to the field of a containment gate of a nuclear power plant, and in particular relates to a drive shaft penetration piece of a containment gate of a nuclear power plant, comprising: a drive shaft, a cavity, a dynamic seal assembly, and a static seal assembly. The cavity is relatively fixed in the axial direction and can rotate relatively; the static seal assembly is located at the end of the cavity, and the static seal assembly and the cavity are fixedly connected by bolts; the dynamic seal assembly is sleeved on the outer circumference of the transmission shaft, and the dynamic seal assembly is connected to the transmission shaft. The circumferential direction is relatively fixed; the upper end face of the dynamic seal assembly is in contact with the lower end face of the static seal assembly. The device of the invention can effectively seal while realizing the transmission function, so as to improve the sealing performance of the personnel gate and the economic benefit of the power station.

Description

A nuclear power plant containment gate drive shaft penetration

technical field

The invention belongs to the field of a containment gate of a nuclear power plant, and particularly relates to a drive shaft penetration piece of a containment gate of a nuclear power plant.

Background technique

The nuclear power plant personnel gate is an important penetration part on the containment, which is a part of the containment boundary of the containment. It has functions such as keeping radioactive substances from leaking in the containment and allowing people to safely enter and exit the containment during the operation of the nuclear power plant. Tianwan Nuclear Power Plant Phase I The engineering personnel gate is a nuclear safety level 2 equipment. Its main functions are to ensure the passage of people and the transportation of small parts, tools and materials; in the event of an accident, to ensure the emergency evacuation of personnel from the accident area and keep the containment sealed; to control radioactive substances in the accident area to prevent proliferation; to prevent fires; Ensure that the interior of the containment vessel is protected from foreign objects, systems and accidents that could cause the release of radioactive material.

The mechanical part of the personnel gate is mainly composed of embedded parts, cylinder body, door panel and transmission mechanism. The opening and closing and interlocking functions of the inner and outer doors are mainly realized by a set of gear distribution mechanism. Four mechanical penetrations are respectively arranged on the gate cylinder: inner door handwheel penetration, outer door handwheel penetration, inner door sealing and locking shaft penetration and inner door door panel drive shaft penetration. Its main function is to transmit the rotating power of the handwheel outside the cylinder into the distribution mechanism in the cylinder, or to transmit the output rotation power of the distribution mechanism in the cylinder to the door opening and closing mechanism and the sealing mechanism outside the cylinder, while ensuring the tightness of the penetration position. The personnel gate has the functional requirement of being manually operable. As one of the components to perform this function, the transmission penetration needs to have the transmission function while still maintaining the function of the sealing of the personnel gate.

The two crew gates of Tianwan Nuclear Power Plant Phase I were designed and manufactured by Russia's PEC-ATOMMA SH Company. After long-term operation, the sealing performance of the mechanical penetration parts of some personnel gates can no longer meet the operating requirements of the unit, and they need to be replaced with spare parts. Because there is no supplier of such spare parts in China, in the early stage, the power station purchased the spare parts for the gate mechanical penetration parts from Russia. During the use process, it was found that the Russian-supplied mechanical penetration parts had poor sealing performance, high price and relatively short supply cycle during operation. long and other issues.

Therefore, there is an urgent need to develop a mechanical penetration piece for the containment gate of a nuclear power plant to solve the above-mentioned problems at present.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a drive shaft penetration of the containment gate of a nuclear power plant, which can effectively seal while realizing the transmission function, so as to improve the sealing performance of the personnel gate and the economic benefit of the power station.

The technical scheme that realizes the object of the present invention:

A nuclear power plant containment gate drive shaft penetration piece, the penetration piece comprises: a drive shaft, a cavity, a dynamic seal assembly, and a static seal assembly, the drive shaft is installed in the cavity, and the drive shaft and the cavity are relatively fixed in the axial direction and can rotate relatively; the static seal assembly is located at the end of the cavity, and the static seal assembly and the cavity are fixedly connected by bolts; the dynamic seal assembly is sleeved on the outer circumference of the transmission shaft, and the dynamic seal assembly is relatively fixed in the circumferential direction of the transmission shaft; The upper end face of the seal assembly is in contact with the lower end face of the static seal assembly.

A sealing ring is arranged between the cavity and the static sealing assembly, and the sealing ring is compressed by the cavity and the static sealing assembly.

Two shaft O-rings are arranged between the dynamic seal assembly and the transmission shaft, and the shaft O-rings are compressed by the dynamic seal assembly and the transmission shaft.

The dynamic seal assembly is provided with a first leakage detection channel, one end of the opening of the first leakage detection channel is opened between the two shaft O-rings, and the other end is opened between the double-channel sealing rings of the movable ring assembly. corresponding location.

The static seal assembly is provided with a second leak detection channel, one end of the opening of the second leak detection channel is opened at a corresponding position between the dual seal rings of the dynamic seal assembly, and the other end is opened outside the static seal assembly.

The second leak detection channel on the static seal assembly communicates with the first leak detection channel on the dynamic seal assembly.

The static seal assembly is provided with a screw plug matched with the second leakage detection channel.

The penetration piece further includes: an end cover and a transparent cover, the end cover is located at the other end of the cavity, and the end cover is fixedly connected with the cavity; the through cover is located at one end of the static seal assembly away from the cavity, and the transparent cover is fixed to the static seal assembly connect.

An adjustment gasket is arranged between the transparent cover and the static seal assembly, and the gap between the transparent cover and the static seal assembly is adjusted by the adjustment gasket.

The transmission shaft is mounted on the cavity through a bearing, and a shaft shoulder is arranged on the transmission shaft. The bearing includes a first bearing and a second bearing arranged at the shaft shoulder of the transmission shaft. The shaft shoulder of the transmission shaft, the two ends of the second bearing respectively abut against the transparent cover and the shaft shoulder of the transmission shaft.

The first bearing and the second bearing are angular contact ball bearings installed in pairs.

The transmission shaft is provided with a spring seat, and the spring seat is fixed on the shaft shoulder of the transmission shaft.

A number of small springs are arranged on the spring seat, the small springs are installed in the countersunk holes on the spring seat, and the two ends of the small springs respectively press against the spring seat and the dynamic seal assembly.

The dynamic seal assembly is provided with an axial long hole, the transmission shaft is provided with a counterbore, and the counterbore is provided with a pin, and the pin extends into the axial long hole to realize the circumferential relative relationship between the transmission shaft and the dynamic seal assembly. fixed.

The penetrating piece further comprises: a first sleeve and a second sleeve, the first sleeve and the second sleeve are respectively installed on the transmission shaft, one end of the sleeve is pressed against the shaft shoulder of the transmission shaft, and one end of the second sleeve is pressed against the transmission shaft shoulder at the other end.

The beneficial technical effect of the present invention is:

1. The leakage detection channel in the transmission shaft penetration part of the containment gate of a nuclear power plant provided by the present invention is conducive to the detection of dynamic seal leakage;

2. The double-channel dynamic seal structure in the transmission shaft penetration of the containment gate of a nuclear power plant provided by the present invention enables one dynamic seal to play a role during leak detection, maintaining the overall tightness of the transmission penetration;

3. A nuclear power plant containment gate drive shaft penetration piece provided by the present invention adopts the structure of multiple small springs, so that the overall force of the dynamic seal assembly is more uniform, which is beneficial to the wear state of the end face and prolongs the service time of the dynamic seal and stability;

4. The first bearing and the second bearing in the transmission shaft penetration part of the containment gate of a nuclear power plant provided by the present invention adopt angular contact ball bearings installed in pairs, so that the bearing capacity of the transmission shaft in the axial direction and the radial direction is improved. At the same time, the runout of the drive shaft is also better, which is beneficial to the stability of the dynamic seal when the equipment is working;

5. In the nuclear power plant containment gate drive shaft penetration piece provided by the present invention, both ends of the drive shaft of the containment gate are connected with the gate drive mechanism by a toothed connection, so that the transmission is more accurate and the state of the gate plate after multiple operations is more stable.

Description of drawings

Fig. 1 is a kind of nuclear power plant containment gate drive shaft penetration member structural schematic diagram provided by the present invention;

2 is a partial cross-sectional view of a drive shaft penetration member of a containment gate of a nuclear power plant provided by the present invention.

In the figure: 1-drive shaft; 2-sleeve one; 3-bolt; 4-end cover; 5-first bearing; 6-cavity; 7-spring seat; 8-small spring; 9-axis O-ring ;10-dynamic seal assembly;11-static seal assembly;12-second bearing;13-through cover bolt;14-through cover;15-sleeve two;16-adjusting gasket;17-plug;18-seal circle; 19-pin; 20-set screw.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , a nuclear power plant containment gate drive shaft penetration piece provided by the present invention includes: a drive shaft 1 , a cavity 6 , a dynamic seal assembly 10 , and a static seal assembly 11 .

The transmission shaft 1 is installed in the cavity 6, and the transmission shaft 1 and the cavity 6 are relatively fixed in the axial direction and can rotate relative to each other; the static seal assembly 11 is located at the end of the cavity 6, and the static seal assembly 11 and the cavity 6 are fixed by bolts Connection, a sealing ring 18 is provided between the cavity 6 and the static sealing assembly 11, and the sealing ring 18 is pressed by the cavity 6 and the static sealing assembly 11; the dynamic sealing assembly 10 is sleeved on the outer circumference of the transmission shaft 1, and the dynamic sealing assembly 10 It is relatively fixed in the circumferential direction of the transmission shaft 1, and two shaft O-rings 9 are arranged between the dynamic seal assembly 10 and the transmission shaft 1, and the shaft O-rings 9 are pressed by the dynamic seal assembly 10 and the transmission shaft 1; The upper end face of the assembly 10 is in contact with the lower end face of the static sealing assembly 11 to achieve the sealing effect.

The dynamic seal assembly 10 is provided with a first leak detection channel. One end of the opening of the first leak detection channel is opened between the two shaft O-rings 9, and the other end is opened between the double-channel seal rings of the dynamic ring assembly 10. A second leak detection channel is provided on the static seal assembly 11, and one end of the opening of the second leak detection channel is opened at the corresponding position between the dual seal rings of the moving ring assembly 10, and the other end is opened at the outside of the static seal assembly 11. ; The static seal assembly 11 is provided with a plug 17 matched with the second leak detection channel.

The end cover 4 is located at the other end of the cavity 6, and the end cover 4 and the cavity 6 are connected and fixed by bolts 3; The cover bolts 13 are connected and fixed, and an adjusting washer 16 is provided between the transparent cover 14 and the static sealing assembly 11 , and the gap between the transparent cover 14 and the static sealing assembly 11 is adjusted by the adjusting washer 16 .

The transmission shaft 1 is mounted on the cavity 6 through a bearing, and the transmission shaft 1 is provided with a shaft shoulder. The bearing includes a first bearing 5 and a second bearing 12 arranged at the shoulder of the transmission shaft 1. The first bearing 5 and the second bearing 12 is an angular contact ball bearing installed in pairs. Both ends of the first bearing 5 abut against the end cover 4 and the shaft shoulder of the transmission shaft 1 respectively, and both ends of the second bearing 12 respectively abut against the transparent cover 14 and the shaft shoulder of the transmission shaft 1 .

The transmission shaft 1 is provided with a spring seat 7, one end of the spring seat 7 is against the shaft shoulder of the transmission shaft 1, and is fixed on the shaft shoulder of the transmission shaft 1 by a set screw 20; the spring seat 7 is provided with a number of small springs 8; The small spring 8 is installed in the countersunk hole on the spring seat 7; the two ends of the small spring 8 are against the spring seat 7 and the dynamic seal assembly 10 respectively; the sleeve 1 is installed on the transmission shaft 1, and one end is against the shaft shoulder of the transmission shaft 1 ; Sleeve two 15 installed on the transmission shaft 1, one end against the shoulder of the other end of the transmission shaft 1.

The dynamic seal assembly 10 is provided with an axial long hole, the transmission shaft 1 is provided with a counterbore, and the counterbore is provided with a column pin 19, and the column pin 19 extends into the axial long hole to realize the transmission shaft 1 and the dynamic seal assembly 10. The circumferential direction is relatively fixed.

The cavity 6 penetrates the door and is fixed to the door by bolts; a sealing ring is arranged between the cavity 6 and the door. The two ends of the penetration piece are connected with the gate transmission mechanism by a toothed connection, which makes the transmission more scarce and the state of the door panel is more stable after many times of operation.

The second leak detection channel on the static seal assembly 11 communicates with the first leak detection channel on the dynamic seal assembly 10, and there are threaded holes to install the leak detection device. The seal plays a role, so that the transmission shaft 1, the dynamic seal assembly 10 and the static seal assembly 11 form a double-channel dynamic seal as a whole; the static seal assembly 11 and the cavity 6 are fixed with bolts 3, and a seal ring 18 is installed between them, forming A sealed whole; the cavity 6 and the door are fixed with bolts, and a sealing ring is installed between the two to form a sealed whole.

When leak detection is required, the leak detection can be performed on the static seal assembly 11 by removing the screw plug 17 on the leak detection channel and connecting to the detection equipment.

The present invention has been described in detail above in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the art, various kind of change. The content that is not described in detail in the present invention can use the prior art.

Claims (15)

1. A nuclear power plant containment gate drive shaft penetration member, characterized in that the penetration member comprises: a transmission shaft (1), a cavity (6), a dynamic seal assembly (10), and a static seal assembly (11), The transmission shaft (1) is installed in the cavity (6), and the transmission shaft (1) and the cavity (6) are relatively fixed in the axial direction and can rotate relative to each other; the static seal assembly (11) is located at the end of the cavity (6) , the static seal assembly (11) and the cavity (6) are fixedly connected by bolts; the dynamic seal assembly (10) is sleeved on the outer circumference of the transmission shaft (1), and the dynamic seal assembly (10) is connected to the circumferential direction of the transmission shaft (1). Relatively fixed; the upper end face of the dynamic seal assembly (10) is in contact with the lower end face of the static seal assembly (11). 2. A nuclear power plant containment gate drive shaft penetration piece according to claim 1, characterized in that a sealing ring (18) is provided between the cavity (6) and the static seal assembly (11) to seal The ring (18) is compressed through the cavity (6) and the static seal assembly (11). 3. A nuclear power plant containment gate drive shaft penetration piece according to claim 2, characterized in that, two shaft O-rings ( 9), the shaft O-ring (9) is pressed by the dynamic seal assembly (10) and the transmission shaft (1). 4. A nuclear power plant containment gate drive shaft penetration piece according to claim 3, characterized in that, the dynamic seal assembly (10) is provided with a first leak detection channel, and an open end of the first leak detection channel It is opened at the position between the two shaft O-rings (9), and the other end is opened at the corresponding position between the double-channel sealing rings of the dynamic seal assembly (10). 5. A nuclear power plant containment gate drive shaft penetration piece according to claim 4, wherein a second leak detection channel is provided on the static seal assembly (11), and an open end of the second leak detection channel is provided The other end is opened at the corresponding position between the double-channel sealing rings of the moving ring assembly (10), and the other end is opened at the outside of the static sealing assembly (11). 6. A nuclear power plant containment gate drive shaft penetration piece according to claim 5, characterized in that the second leakage detection channel on the static seal assembly (11) and the first leak detection channel on the dynamic seal assembly (10) A leak detection channel is passed through. 7. A nuclear power plant containment gate drive shaft penetration piece according to claim 6, characterized in that, the static seal assembly (11) is provided with a screw plug (17) matched with the second leak detection channel. 8. A nuclear power plant containment gate drive shaft penetration member according to claim 7, characterized in that the penetration member further comprises: an end cover (4) and a through cover (14), the end cover (4) being located at At the other end of the cavity (6), the end cover (4) is fixedly connected to the cavity (6); It is fixedly connected with the static seal assembly (11). 9. A nuclear power plant containment gate drive shaft penetration piece according to claim 8, characterized in that an adjusting gasket (16) is arranged between the through cover (14) and the static seal assembly (11), Adjust the gap between the transparent cover (14) and the static seal assembly (11) by adjusting the gasket (16). 10. A nuclear power plant containment gate drive shaft penetration piece according to claim 9, wherein the drive shaft (1) is mounted on the cavity (6) through a bearing, and the drive shaft (1) is provided with There is a shaft shoulder, the bearing includes a first bearing (5) and a second bearing (12) arranged at the shaft shoulder of the transmission shaft (1), the two ends of the first bearing (5) respectively abut against the end cover (4) and the transmission shaft The shaft (1) has a shaft shoulder, and both ends of the second bearing (12) abut against the transparent cover (14) and the shaft shoulder of the transmission shaft (1) respectively. 11. A nuclear power plant containment gate drive shaft penetration piece according to claim 10, characterized in that, the first bearing (5) and the second bearing (12) are angular contact ball bearings installed in pairs. 12. A nuclear power plant containment gate drive shaft penetration piece according to claim 11, wherein a spring seat (7) is provided on the drive shaft (1), and the spring seat (7) is fixed on the drive shaft (1) on the shaft shoulder. 13. A nuclear power plant containment gate drive shaft penetration piece according to claim 12, wherein a plurality of small springs (8) are provided on the spring seat (7), and the small springs (8) are installed on the spring In the counterbore on the seat (7), both ends of the small spring (8) press against the spring seat (7) and the dynamic seal assembly (10) respectively. 14. A nuclear power plant containment gate drive shaft penetration piece according to claim 13, characterized in that, the dynamic seal assembly (10) is provided with an axial long hole, and the drive shaft (1) is provided with a sinker A stud (19) is arranged in the counterbore, and the stud (19) extends into the axially long hole to realize the relative fixation of the transmission shaft (1) and the dynamic seal assembly (10) in the circumferential direction. 15. A nuclear power plant containment gate drive shaft penetration member according to claim 14, characterized in that, the penetration member further comprises: a first sleeve (2) and a second sleeve (15), the first sleeve ( 2) and the second sleeve (15) are respectively installed on the transmission shaft (1), one end of the sleeve one (2) is against the shoulder of the transmission shaft (1), and one end of the second sleeve (15) is against the transmission shaft (1) shoulder at the other end.

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