JP2001235576A - Device for equalizing pressure of air lock for staff - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air lock for staffs simple in constitution, easily maintained and inspected and facilitating a local airtightness test. SOLUTION: This device for equalizing the pressure of an air lock for staffs is provided with an air lock room 1 formed by opening flanges 1a, 1b provided on one side and the other side of a staff passage; doors formed at the respective open flanges 1a, 1b to open/close an opening separately; pressure equalizing communicating holes 13 formed in the respective open flanges 1a, 1b: and pressure equalizing devices 25a, 25b capable of separately opening/closing the communicating holes 13 through driving shafts 5, 6 by the rotation of handles 24a, 24b, 24a', 24b' provided inside and outside of the air lock room 1. The device is further provided with a pressure contact valve 27 provided with a seal 26 and brought into pressure contact with and separated from the periphery of the communicating hole 13 of the open flange 1a (1b) to cut off and open the communication hole 13, and a valve opening/closing driving device 28 for driving the pressure contact valve 27 for pressure contact and separation by the rotation of the handles 24a, 24b, 24a', 24b'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure equalizing device for an airlock for an employee.

[0002]

2. Description of the Related Art In a reactor containment vessel, a passage for personnel at the time of inspection work of a nuclear reactor is secured, and air in the reactor containment vessel is prevented from flowing out when personnel enter and exit. There is an airlock for personnel.

FIG. 4 shows an example of a conventional air lock for personnel provided in a reactor containment vessel (not shown). The staff airlock has a cylindrical staff passage A penetrating the inside and outside of the reactor containment vessel, and the inside and outside of the staff passage A are used to partition the staff passage A between inside and outside. Two opening flanges 1a and 1b are provided, and an airlock chamber 1 is formed by the staff passage A and the opening flanges 1a and 1b.

[0004] Each of the opening flanges 1a and 1b is formed with an opening 2 for the passage of personnel.
The inner door 4a and the outer door, at which the opening 2 can be closed from the center side of the reactor containment vessel by pivoting about the door rotation axis 3 respectively at the center side of the containment vessel at a and 1b. 4b is arranged.

The doors 4a and 4b are individually opened and closed by a door opening and closing device described below.

The door opening / closing device comprises drive shafts 5 and 6 disposed at the side positions of the doors 4a and 4b and penetrating the opening flanges 1a and 1b and the airlock chamber 1, and the doors 5 and 6 are provided with the doors. It has cam switching devices 7a and 7b arranged corresponding to the doors 4a and 4b so as to open and close 4a and 4b.

A handle 8a for rotating the drive shaft 5 is provided at an inner end of the door 4a of the drive shaft 5, and a drive shaft 6 is provided at an outer end of the door 4b of the drive shaft 6. Is provided, and a reversing device 9 provided with a bevel gear is provided at the opposite end of the drive shafts 5 and 6 in the air lock chamber 1 so that the drive shafts 5 and 6 are always The reversing device 9 is also provided with an intermediate handle 8c for driving the drive shafts 5, 6.

[0008] The cam switching devices 7a and 7b are provided with drive shafts 5 and 6
The drive shafts 5 and 6 rotate in opposite directions to rotate the doors 4a and 4b regardless of which of the handles 8a, 8b and 8c is rotated. 4b are sequentially opened and closed so that the doors 4a and 4b are not simultaneously opened.

The cam switching devices 7a and 7b are rotated to rotate the cam switching devices 7a and 7b.
, The latch device 11 and the door opening / closing drive device 12 are sequentially driven. That is, when the staff members enter and exit by opening the doors 4a and 4b, first, in order to prevent the air in the reactor containment vessel from flowing outside, the pressure equalizer 10 is used.
To equalize the pressure between the air lock chamber 1 and the inside and outside thereof, further lock and unlock the doors 4a and 4b by the latch device 11, and open and close the doors 4a and 4b by the door opening and closing drive device 12. Need to drive.

As shown in FIGS. 4 and 5, the pressure equalizing device 10 has a communication hole 13 for pressure equalization in the opening flanges 1a and 1b, and a ball valve 15 in a pipe 14 connected to the communication hole 13.
Are connected. Further, a switching lever 16 provided on the ball valve 15 is connected to a rod 17 which is pushed and pulled by rotation of the cam switching devices 7a and 7b. Reference numeral 18 in FIG. 5 indicates a filter provided in the ball valve 15 and the communication hole 13.

Therefore, in the pressure equalizing device 10, the rotation of the cam switching devices 7a and 7b pushes and pulls the rod 17 to open and close the ball valve 15, so that the inside and outside of each of the opening flanges 1a and 1b are separated. Communication (equalizing pressure) and cutoff are performed between the two.

The latch device 11 is a cam switching device 7 shown in FIG.
a rod 19 pushed and pulled by the rotation of a and 7b
The latch claw 20 locked and unlocked by
Provided between the doors 4a, 4b and the opening flanges 1a, 1b, the latch claws 20 are unlocked before the doors 4a, 4b are opened, and are locked after the doors 4a, 4b are closed. ing.

The door opening / closing drive unit 12 includes the cam switching unit 7
rod 21 pushed and pulled by rotation of a, 7b
Door rotating shaft 3 via shafts 22 and 23 rotated by
Is rotated to open and close the doors 4a and 4b.

For example, a case where a member enters the inside (right side in FIG. 4) of the containment vessel from outside (left side in FIG. 4) through the airlock chamber 1 will be described. First, when the drive shaft 6 is rotated by turning the handle 8b in a certain direction to enter the air lock chamber 1 from the outside (left side), first, the cam switching device 7b
The rod 17 of the pressure equalizer 10 is pushed by the
5 is opened and the communication hole 13 communicates, so that the pressure between the outside and the inside of the airlock chamber 1 is equalized. When the handle 8b is further turned, the cam switching device 7b causes the latch device 1 to rotate.
1 is pushed, the latch claw 20 is unlocked, the door 4b can be opened, and the handle 8b
Is turned, the door opening / closing drive device 12 is driven by the cam switching device 7b.
Is pushed, the shafts 22 and 23 are rotated, and the door rotating shaft 3 is turned to open the door 4b.

When the drive shaft 6 is rotated in the opposite direction by the intermediate handle 8c after the worker enters the air lock chamber 1, the operation is reversed, that is, the rod 21 is pulled and the door 4b
Is closed, the rod 19 is pulled, the latch claw 20 is locked, the rod 17 is pulled, and the ball valve 15 is closed.

Subsequently, when the drive shaft 5 is further turned in the same direction by the intermediate handle 8c, the ball valve 15 provided on the opening flange 1a is opened by the cam switching device 7a, and the inside and the inside of the air lock chamber 1 are opened. And then the latch claw 20 is unlocked, and then the door 4a is opened, so that the staff can go inside. Next, when the drive shaft 5 is rotated in the reverse direction by the handle 8a, the door 4
b is closed, the latch claw 20 is locked, and the ball valve 1
5 is closed.

When a member enters the outside (left side in FIG. 4) of the containment vessel from the inside (right side in FIG. 4) through the airlock chamber 1, the above operation is performed in reverse.

[0018]

However, in the conventional pressure equalizing device 10 shown in FIGS. 4 and 5, the cam switching device 7 is not provided.
a, by the rod 17 pushed and pulled by 7b,
Due to the structure for opening and closing the ball valve 15, there are various problems as follows.

That is, in the airlock for staff, it is necessary to carry out an airtightness test of the pressure equalizing device 10, but when carrying out an airtightness test with the conventional pressure equalizing device 10, the pipe 14 is connected to the communication hole 13. It is necessary to pressurize the entire airlock chamber 1 and perform a test in a state where the ball valve 15 mounted through the airlock is closed. As described above, the conventional pressure equalizing apparatus 10 has a problem that a local airtightness test cannot be performed, so that the airtightness test becomes large and a long test time is required.

Also, when a leak is detected by the above-mentioned airtightness test, it is not known whether there is a leak in the ball valve 15 itself, a leak in the pipe 14, or a leak in the communication hole 13. There was a problem that it took time to specify the location.

The present invention has been made to solve such a conventional problem, and has a simple structure and easy maintenance and inspection.
Moreover, it is an object of the present invention to provide a pressure equalizing device for an airlock for a staff member who can easily perform a local airtight test.

[0022]

SUMMARY OF THE INVENTION The present invention separately opens and closes an airlock chamber formed by an opening flange provided on one side and the other side of a staff passage, and an opening formed in each of the opening flanges. A door, a communication hole for pressure equalization formed in each opening flange, and a pressure equalizer capable of separately opening and closing the communication hole via a drive shaft by rotation of a handle provided inside and outside the air lock chamber. A pressure equalizing device for an airlock for a staff member, comprising a seal provided with a seal, which presses and separates around the communication hole of the opening flange to shut off and open the communication hole, and rotation of the handle. And a valve opening / closing drive device for driving the pressure bonding / separation of the pressure bonding valve.

[0023] In the above means, the pressure valve may include a touch valve element having a seal surrounding the communication hole, a valve rod provided vertically on the back surface of the touch valve element, and a pressure valve provided on an outer periphery of the valve rod to open the pressure valve. The valve opening / closing drive device comprises a rotating shaft that rotates in conjunction with the drive shaft by rotation of a handle, and a valve rod through a nut device by rotation of the rotation shaft. And a pressing spring provided between the slide block and the valve rod.

Further, a double-structured seal is provided on the crimping valve,
Further, a fluid supply port for an airtightness test may be provided between the seals having the double structure.

According to the above means, the operation is as follows.

When the drive shaft is rotated by the handle, the rotation shaft rotates and the slide block slides through the nut device, and the crimping valve is crimped on the inner surface of the opening flange.
Since the opening and closing of the communication hole are performed apart from each other, the driving direction of the crimping valve is uniaxial, so that the structure of the pressure equalizing device is simple and the structure is easy to access from outside. Maintenance is easy.

Further, since the seal of the crimping valve has a double structure and a fluid supply port for an airtight test is provided between the seals of the double structure, the fluid supply port is closed with the communication hole closed by the crimp valve. If the fluid is supplied under pressure from the mouth and the leakage of the fluid is inspected, the airtightness test can be easily performed by the local test.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a pressure equalizing device for an airlock for personnel according to the present invention.
In the drawings, the same components as those in FIGS. 4 and 5 are denoted by the same reference numerals, and the description thereof is omitted.

1 and 2, the drive shafts 5, 6 provided through the opening flanges 1a, 1b are separated from each other as compared with the structure shown in FIG.
Are provided with handles 24a, 24b, and the drive shaft 6 is provided with handles 24a ', 24b'.
The opening and closing of b is performed independently by the drive shafts 5 and 6. Each communication hole 13 formed in each of the opening flanges 1a and 1b has a communication hole 13 inside the airlock chamber 1.
The pressure equalizing devices 25a and 25b are configured to be opened and closed independently of each other. At this time, the handles 24a, 24
b or the rotation of the handles 24a 'and 24b' to rotate the drive shaft 5 or the drive shaft 6 to adjust the pressure equalizing device 25a or 25b.
When b is operated, the latch device and the door opening / closing drive device (not shown) are connected so as to be sequentially operated in conjunction with the drive shafts 5 and 6.

The pressure equalizing devices 25a and 25b shown in FIGS.
And a crimping valve 27 that presses and separates the seal 26 so as to surround the periphery of the communication hole 13 with respect to the side surface of the air lock chamber 1 of the opening flanges 1a and 1b, thereby blocking and opening the communication hole 13. And a valve opening / closing drive device 28 for driving the pressure bonding / separation of the pressure bonding valve 27. 29 in the figure
A support base fixed horizontally to the inner side wall of the airlock chamber 1 via a fixing member 30, and a slide base 31 is provided on the support base 29.

The pressure valve 27 includes a touch valve body 32 having a seal 26 surrounding the communication hole 13, and a touch valve body 32.
And a valve rod 33 formed vertically on the back surface of the support frame 29. The valve rod 33 is axially moved by a slide bearing 34 provided on the support base 29 in a state where the axis of the communication hole 13 coincides with the axis. It is movably supported. Further, the valve rod 3
A return spring 36 is provided between the stepped portion 35 formed at the end of the third end 3 and the slide bearing 34 so as to urge the pressure valve 27 away from the opening flanges 1a and 1b.

The seal 26 provided on the touch valve body 32 of the crimping valve 27 has a double structure as shown in FIG. 3, and a fluid supply for airtightness test is provided between the double structure seals 26a and 26b. An opening 37 is provided.

As shown in FIGS. 1 and 2, the valve opening / closing drive device 28 includes a wheel 38 and a chain 39
And a rotating shaft 40 which is connected via a transmission mechanism composed of the like to rotate in conjunction with the drive shafts 5, 6. The rotating shaft 40 is provided on a support base 29 and other bearings provided on other portions. It is rotatably supported by 41. Further, a slide block 4 is provided on the slide base 31 of the support base 29.
2 is provided slidably in the axial direction of the valve rod 33. A screw portion 40 screwed into a nut hole 42a formed in the slide block 42 is provided at the tip of the rotation shaft 40.
a is provided with the nut device 43, and the rotating shaft 4
When 0 is rotated, the slide block 42 slides along the slide table 31 in the axial direction of the valve rod 33 via the nut device 43.

At the right end of the slide block 42, there is provided a guide rod 45 which fits into a fitting hole 44 formed at the left end of the valve rod 33. Further, a guide rod 45 is provided between the slide block 42 and the valve rod 33. Is provided with a pressing spring 46 having a greater elasticity than the return spring 36.

Next, the pressure equalizing device 25 in the above embodiment is described.
The operation of a and 25b will be described.

Touch valve element 32 of pressure equalizers 25a and 25b
When the pressure equalization is performed by opening the communication hole 13 by separating the touch valve body 32 from the opening flanges 1a and 1b while the communication hole 13 is closed,
Handles 24a, 24b or 24a ', 24
By rotating b ′, the drive shaft 5 or the drive shaft 6 is rotated in a predetermined direction to rotate the rotation shaft 40 in a predetermined direction. Then
The slide block 42 slides in the direction away from the pressure valve 27 along the slide base 31 by the nut device 43 at the tip of the rotary shaft 40. At this time, the pressure valve 27 is moved away from the opening flanges 1a, 1b by the return spring 36. , The crimping valve 27 is
The pressure equalization is performed by separating from the holes a and 1b and opening the communication hole 13.

When the handles 24a, 24b or the handles 24a ', 24b' are rotated in the opposite direction to the above, the slide block 42 is moved along the slide base 31 to the crimp valve 27 by the nut device 43 at the end of the rotary shaft 40. The valve rod 3 slides in the approaching direction,
Press 3. As a result, the crimping valve 27 has the opening flange 1a,
1b, and the slide block 42 is further moved.
7 is press-fitted to the opening flanges 1a and 1b with a predetermined force, thereby closing the communication hole 13.

The rotation of the handle 24a, 24b or the handle 24a ', 24b' causes the drive shaft 5 or the drive shaft 6 to rotate.
When the pressure equalizers 25a and 25b are actuated by rotating the levers, a latch device and a door opening / closing driving device (not shown) are sequentially driven in conjunction therewith to lock and unlock the latch claw 20, and the doors 4a and 4b. Is opened and closed.

As described above, the handles 24a, 24b
Alternatively, when the drive shaft 5 or 6 is rotated by the handles 24a 'and 24b', the rotation shaft 40 is rotated so that the slide block 42 slides via the nut device 43, and the crimping valve 27 is moved to the inner surfaces of the opening flanges 1a and 1b. Since the communication hole 13 is opened and closed by pressing and separating, the driving direction of the pressing valve 27 is uniaxial, so that the pressure equalizer 25 is used.
Since the structures of a and 25b are simple and the structure is easy to access from the outside, maintenance and inspection are easy.

The seal 26 provided on the crimping valve 27 has a double structure, and is provided between the double-structured seals 26a and 26b.
Since the fluid supply port 37 for the air tightness test is provided, the fluid is supplied under pressure from the fluid supply port 37 in a state where the communication hole 13 is closed by the crimping valve 27, and the leakage of the fluid is inspected. Can be easily performed by a local test.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0043]

According to the present invention, when the drive shaft is rotated by the handle, the rotation shaft rotates, so that the slide block slides via the nut device, and the crimping valve crimps and separates from the inner surface of the opening flange. Since the communication hole is opened and closed, the driving direction of the crimping valve is uniaxial, so the structure of the pressure equalizer is simple, and the structure is easy to access from the outside, so maintenance is required. There is an effect that inspection is easy.

Further, since the seal of the crimping valve has a double structure and a fluid supply port for an airtightness test is provided between the double-structured seals, the fluid supply port is closed with the communication hole closed by the crimping valve. If the fluid is pressurized and supplied from the mouth and the leakage of the fluid is inspected, there is an effect that the airtightness test can be easily performed by the local test.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a pressure equalizing device for a staff airlock according to the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a detailed sectional view of the crimp valve of FIG. 1;

FIG. 4 is an overall perspective view showing an example of a conventional staff air lock.

FIG. 5 is a side view showing an example of a conventional pressure equalizing device for a staff airlock.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air lock chamber 1a, 1b Opening flange 2 Opening 4a, 4b Door 5, 6 Drive shaft 13 Communication hole 24a, 24b, 24a ', 24b' Handle 25a, 25b Equalizing device 26 Seal 26a, 26b Seal 27 Crimping valve 28 Valve Opening / closing drive device 32 Touch valve element 33 Valve rod 36 Return spring 37 Fluid supply port 40 Rotating shaft 42 Slide block 43 Nut device 46 Press spring A Passage for personnel

Claims (3)

[Claims] 1. An airlock chamber formed by opening flanges provided on one side and the other side of an employee passage, a door for independently opening and closing the opening formed in each of the opening flanges, and an opening formed in each opening flange. Equalizing pressure of an airlock for personnel, comprising: a communication hole for pressure equalization; and a pressure equalizing device capable of separately opening and closing the communication hole via a drive shaft by rotation of a handle provided inside and outside the airlock chamber. An apparatus, comprising: a crimp valve provided with a seal to close and open the communication hole by crimping / separating around the communication hole of the opening flange; and driving the crimping / separation of the crimp valve by rotation of the handle. And a valve opening / closing drive device. A pressure valve provided with a seal surrounding the communication hole, a valve rod provided vertically on a back surface of the touch valve element, and a pressure valve provided on an outer periphery of the valve rod to separate the pressure valve from the opening flange. The valve opening / closing drive device is constituted by a return spring biased in a direction to rotate the valve shaft through a nut device through a nut device through rotation of the rotation shaft in conjunction with the drive shaft by rotation of the handle. 2. A pressure equalizing device for an airlock for an occupant according to claim 1, comprising a slide block which slides in a direction, and a pressing spring provided between said slide block and a valve rod. 3. The member according to claim 1, wherein the crimping valve is provided with a double-structured seal, and a fluid supply port for an airtight test is provided between the double-structured seals. Airlock pressure equalizer.