JPH11159649A - Cylindrical opening/closing valve mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure for a cylindrical opening/closing valve decreasing a space necessary for mounting a flow control valve. SOLUTION: A mounting structure for a cylindrical opening/closing valve has an output valve 3 provided with a valve supply port receiving supply of gas in the vicinity of a lower surface central part and a valve output port connecting to or interrupting from the valve supply port by opening/closing of a valve, and an output valve block 13 mounting the cylindrical opening/ closing valve in an upper surface to extend the upper surface mounting the output valve 3 in one side surface direction to use two bolt holes formed in the extended upper surface to be fixed to an output manifold 12 by a mounting bolt 41 also to be formed with a communication path connecting a manifold port 12b to the valve output port. The manifold port 12b is formed between the two mounting bolts 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a cylindrical opening / closing valve used in a gas supply device used in an industrial manufacturing apparatus such as a semiconductor manufacturing apparatus, and more particularly, to a mounting structure for a large number of small open spaces. The present invention relates to a cylindrical on-off valve mounting structure to which a cylindrical on-off valve can be mounted.

[0002]

2. Description of the Related Art Conventionally, in a semiconductor manufacturing process, a corrosive gas has been used for etching of a photoresist process or the like. Photoresist processing (photoresist coating, exposure,
Development and etching) are repeated a plurality of times in the semiconductor manufacturing process. Therefore, in the actual semiconductor manufacturing process, a gas supply device that supplies a corrosive gas as needed is used. In recent years, as the degree of integration of semiconductors has increased and the demand for processing accuracy has increased, it has been desired to accurately control the supply amount of corrosive gas used in etching and the like. Further, demands for timing and speed are becoming severer due to a demand for shortening a manufacturing process time for cost reduction.

On the other hand, in recent years, for example, in a semiconductor manufacturing process, it is required to supply a small amount of corrosive gas or the like with a flow rate of 1% or less in accuracy, and the demand for accuracy is becoming more severe. Therefore, a flow control valve having high accuracy and high responsiveness is used. And, in a flow control valve or the like for accurately controlling the corrosive gas supply amount,
As a mass flow sensor that measures flow mass with high accuracy and high responsiveness, a corrosive gas flows inside a narrow conduit, and a pair of self-heating thermometers with large temperature coefficients on the upstream and downstream sides of the conduit, respectively. Is used to form a bridge circuit by each heat-sensitive coil, control the temperature of the heat-sensitive coil to a constant value, and calculate the mass flow rate of the corrosive gas from the potential difference between the bridge circuits. .

[0004] The conduit used at this time is, for example,
It is a tube made of SUS316 having an inner diameter of 0.5 mm and a length of 20 mm. The inside diameter is small in order to accurately measure the flow rate of a small amount of fluid gas. Then, two heat-sensitive coils are formed by winding a heat-sensitive resistance wire having a diameter of 25 μm 70 turns on the upstream side and the downstream side of the conduit. The heat-sensitive resistance wire is made of a material having a large temperature coefficient, such as iron or a nickel alloy. The heat-sensitive coil is adhered to the conduit with a UV curing resin or the like, and forms a sensor unit. In a semiconductor manufacturing process, a plurality of units combining such a flow control valve and a plurality of cylindrical on-off valves are used. Here, when nitrogen gas or the like supplied to the cylindrical on-off valve is common, nitrogen gas or the like is supplied by a manifold plate to which the cylindrical on-off valve of each unit is attached.
For example, in the photoresist process, more than 10 types of gas may be supplied. At that time, the flow control valve units are mounted on the manifold by the number of types of gas.

[0005]

However, the conventional apparatus has the following problems. (1) Currently, there is a strong demand for downsizing the manufacturing apparatus. It's not just about saving space,
This is because, for example, by reducing the size, the time for creating a predetermined vacuum by the vacuum pump can be shortened, and the production efficiency can be improved. However, in the conventional device, a large space is required to arrange a plurality of flow control valve units,
It was going in the direction of trying to make the manufacturing equipment more compact. That is, in the conventional cylindrical on-off valve mounting structure, there is a problem that production efficiency is deteriorated because a large space is taken.

(2) When the flow control valve is replaced, it is formed of a donut-shaped pipe having an opening on the outer peripheral surface to seal a communication hole between the flow control valve and a block constituting the unit. Use a gasket with a coil spring mounted inside. At this time, the gasket is supplied alone to the block, and the block is fastened with screws. However, when the gasket is sandwiched between the blocks and tightened with screws, the gasket may shift laterally, and the misalignment of the gasket due to the lateral shift may result in incomplete sealing and leakage of corrosive gas. was there. Also, since gaskets are small parts,
It was difficult to accurately supply the gasket to a predetermined position on the block. In particular, when the block or the like has an inclination with respect to the horizontal plane, the gasket slides easily and is displaced, which is a problem.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a mounting structure of a cylindrical on-off valve which requires less space for mounting a flow control valve.

[0008]

To achieve this object, a gas supply apparatus according to the present invention has the following configuration. The mounting structure of the cylindrical on-off valve according to the present invention is a cylindrical on-off valve mounting structure for mounting the cylindrical on-off valve on a manifold plate having a manifold port communicating with the cylindrical on-off valve, and (1) near the center of the lower surface. A cylindrical on-off valve including a valve supply port for receiving gas supply, a valve output port for communicating with or shut off from the valve supply port by opening and closing the valve; and (2) the cylindrical on-off valve is mounted on an upper surface,
The upper surface to which the cylindrical on-off valve is attached extends in one side direction, and is fixed to the manifold plate by bolts using two bolt holes formed in the extended upper surface, and the manifold port and the valve And (3) the manifold port is formed between the two mounting bolts. The mounting block has a supply port and a communication passage communicating with the valve output port.

In the above mounting structure, (4) a gasket in which a coil spring is mounted in a donut-shaped pipe having an opening formed on the outer peripheral surface, and (5) a gasket having the opening formed from outside. A gasket holding member for holding the manifold port at a position surrounding the manifold port,
(6) The two mounting bolts are located point-symmetrically with respect to the center of the gasket.

[0010]

The flow rate control valve of the gas supply apparatus of the present invention having the above-described structure adjusts the valve opening while measuring the flow rate to supply a corrosive gas having a predetermined mass flow rate. In a flow sensor installed in a flow control valve, a thin pipe is used to measure a flow rate with high accuracy and a high response speed. In addition, the first cylindrical on-off valve and the second cylindrical on-off valve which are integrally formed with the flow control valve on both sides of the flow control valve pass or block the flow of the supply gas.
Further, the replacement gas supply means is located between the first and second cylindrical on-off valves and supplies the replacement gas to the flow control valve. In addition, the ejector as the exhaust means is also located in the middle of the first and second cylindrical on-off valves and near the flow control valve,
The supply gas remaining in the flow control valve is depressurized.

The first and second cylindrical on-off valves are fastened to the mounting block by four bolts. Further, since the mounting block is fastened to the manifold plate on one side by two bolt holes formed on the extended upper surface, the space for the bolt on the opposite side becomes unnecessary, and the mounting space for the cylindrical on-off valve can be reduced. . At this time, since a manifold port for communicating the manifold plate and the mounting block is formed between the two mounting bolts, there is no possibility that gas leaks from a gap between the manifold plate and the mounting block.

Next, a case where the flow control valve is replaced will be described. The flow control valve can be easily removed simply by unscrewing the unit upward. When a new flow control valve is installed, a new gasket for sealing around the flow path hole between the block constituting the unit and the flow control valve is used. The gasket is held between the pair of gasket holding portions of the gasket holding member at the opening. At this time, the gasket holding member has a spring property and holds the gasket firmly. Further, since the gasket holding member has a slightly concave portion at a fixed position sandwiching the gasket, the gasket is accurately held at the fixed position with respect to the gasket holding member.

The gasket holding member is positioned by the pin positioning portion on the pin member formed on the block. Thereby, the gasket is accurately positioned with respect to the flow path hole. Next, since the gasket is screwed from above in a state where the gasket is held by the gasket holding member, the gasket does not shift laterally, so that the gasket can be crushed uniformly. At this time,
The gasket pipe is crushed by the block to seal around the hole. However, since the coil spring is mounted inside the pipe, the pipe is always kept in close contact with the block, and a good sealing state is maintained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas supply apparatus according to one embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 3 is a circuit diagram illustrating a configuration of a gas supply unit. The gas supply unit that supplies the corrosive gas Fa that is a supply gas includes an input valve 2 that is a first cylindrical on-off valve and a corrosive gas F
A flow control valve 5 for measuring a flow rate of a and supplying a certain amount of corrosive gas Fa and an output valve 3 as a second cylindrical on-off valve are connected in series. An input port of the flow control valve 5 has an ejector 4 serving as a supply gas exhaust unit via an ejector valve 7 and a nitrogen gas containing an inert gas nitrogen as a replacement gas via a purge valve 6. A gas tank (not shown) is connected. The output port of the output valve 3 is connected to the output port of the corrosive gas Fb which is another supply gas.
b is mixed and supplied to the manufacturing process as a mixed gas Fo.

An embodiment of this circuit diagram is shown in FIGS. FIG. 1 is a side view showing a configuration of a gas supply unit for supplying a supply gas Fa, and FIG. 2 is an exploded perspective view thereof. FIG. 3 shows the flow of the supply gas Fa in the gas supply unit. On the left and right sides of the flow control valve 5, there are blocks for changing the direction of the flow path, and flow control valve blocks 44, 45 for screwing the unit from above with screws 41 are fastened with screws from the lateral direction. Have been. Below the flow control valve block 44, a direction changing block 14 for changing the direction of the flow path is screwed to the output valve block 13 from the right. The output valve 3 is screwed to the output valve block 13 as an attachment block from above. Also, the output valve block 13
, An output joint 43 is attached from the left.
The upper surface of the output valve block 13 to which the output valve 3 as the cylindrical on-off valve is attached is extended in one side direction, and two bolt holes are formed in the extended upper surface. The output valve block 13 is fastened to the output manifold 12, which is a manifold plate screwed to the base plate 48 from below, with two bolts 41 from above using the bolt holes. The output manifold 12 has a pair of female screw holes formed at positions corresponding to the two mounting bolt holes of the output valve block 13. A manifold port 12b is formed at the center of the two female screw holes.

Below the flow control valve block 45,
A direction change block 15 for changing the direction of the flow path is bolted to the input valve block 16 from the left. The purge valve 6, the ejector valve 7, and the input valve 2 are bolted to the input valve block 16, which is a mounting block, from above. An input joint 42 is attached to the input valve block 16 from the right. The input valve block 16 includes a purge manifold 46 and an ejector manifold 47, each of which is a manifold plate and bolted to the base plate 48 from below.
And are fastened with two mounting bolts from above. The ejector 4 is connected to one end of the ejector manifold 47 via the ejector pipe 18. Also,
One end of the purge manifold 46 is connected to a nitrogen gas tank (not shown) storing nitrogen gas as an inert gas.

As shown in FIG. 2, a gasket 8 and a gasket retainer 10 are mounted between the flow control valve blocks 44 and 45 and the direction change blocks 14 and 15. FIG. 5 shows the structure of the gasket 8 used for the corrosive gas Fa or the like. (A) is a plan view,
(B) is a side view. In the gasket 8, a pipe whose one side is opened forms a circle. At this time, the opening 8
a is located on the outer periphery. A spring 8b wound in a coil shape is mounted in the pipe.

Here, a case where the flow control valve 5 is replaced will be described. The flow control valve 5 can be easily removed from the unit by removing the two screws 41 on both sides upward. Next, a new flow control valve 5 is mounted. However, the gasket 8 is crushed once used and the airtightness is deteriorated, so that the gasket 8 cannot be reused. Therefore, a new gasket 8 is used. The structure of the gasket retainer 10 is shown in a plan view in FIG. The gasket retainer 10 is formed by etching a plate material having a thickness of 0.3 mm. The gasket 8 is held with its opening 8a sandwiched between a pair of thin, leaf spring-shaped gasket holding portions 10a of the gasket retainer 10.
A small concave portion 10b is formed in the gasket holding portion 10a, and the opening of the gasket 8 is engaged with the concave portion 10b. As a result, the gasket 8 is positioned with respect to the gasket retainer 10.

The gasket retainer 10 is formed with a recess 10d for a pair of mounting screws. The gasket retainer 10 has two pairs of bent portions 10e and 10f.
Is formed and bent at the time of use to be used for positioning with respect to the block. When the flow control valve 5 is mounted, the two pairs of bent portions 10e and 10f of the gasket retainer 10 in which the gasket 8 is engaged with the concave portions 10b,
It is set so as to sandwich the outside of the direction conversion blocks 14 and 15. At this time, the position in the left-right direction is determined by fitting the gasket 8 to the counterbore portion 14c of the direction change block 14. As a result, the gasket 8 is positioned with respect to the gas holes 14b and 15b of the direction change blocks 14 and 15.

FIG. 8 is a sectional view showing a state in which the gasket 8 and the gasket retainer 10 are mounted between the direction changing block 14 and the flow control valve block 44. The thickness of the gasket 8 is 1.6 mm. Each of the direction changing block 14 and the flow control valve block 44 has a counterbore 44b, 1 having a depth of 0.5 mm for the gasket retainer 10.
4c is formed. The thickness of the gasket retainer 10 is 0.3 mm, and by tightening the screw 41 in this state, the gasket 8 is crushed by 0.3 mm. At this time, the gasket 8 and the counterbore portions 44b, 14c
Although there is play, the gasket 8 is held by the gasket retainer 10, so that the gasket 8 does not shift laterally and the flow control valve 5 can be attached, so that the gasket 8 has high airtightness. Further, since the gasket 8 is uniformly compressed, it is possible to completely seal the gasket 8, and there is no fear that the corrosive gas Fa leaks.

As shown in FIG. 2, a gasket 8 and a gasket retainer 9 are also mounted between the output valve block 13 and the output manifold 12. FIG. 6 shows the structure of the gasket retainer 9. Gasket retainer 9
Is etched from a plate material having a thickness of 0.3 mm. The gasket 8 has a pair of thin, leaf spring-shaped gasket holding portions 9 a of the gasket retainer 9.
And held between them. A small recess 9b is formed in the gasket holding portion 9a, and the opening of the gasket 8 is engaged with the recess 9b. This allows
The gasket 8 is positioned with respect to the gasket retainer 9.

The gasket retainer 9 is formed with a pair of positioning holes 9c fitted into a pair of positioning pins 12 mounted on the block, and a relief 9d for a mounting screw. When attaching the output valve block 13, the recess 9b
Then, the positioning hole 9c of the gasket retainer 9 with which the gasket 8 is engaged is fitted to the positioning pin 12a attached to the output manifold 12. Thereby, the gasket 8 is connected to the manifold port 12 of the output manifold 12.
b.

Although the bolt is tightened in this state, since the gasket 8 is held by the gasket retainer 9, the output valve block 13 can be mounted without causing the gasket 8 to shift sideways.
The airtightness is increased. Further, since the gasket 8 is uniformly compressed, it is possible to completely seal the gasket 8, and there is no fear that the corrosive gas Fb leaks.

Next, the inflow and outflow paths of each gas will be described with reference to FIG. The corrosive gas Fa is supplied to the input joint 42.
And flows into the unit, passes through a hole in the input block 16, and is connected to the input port of the input valve 2. Input valve 2
Output port passes through a passage inside the input block 16,
The direction is changed by the direction change block 15 and the flow control block 45, and connected to the input port of the flow control valve 5. The output valve 3, the input valve 2, the ejector valve 7, and the purge valve 6 used in the present embodiment are all ordinary solenoid valves, and have an input port and an output port near the center of the lower surface. . The output port of the input valve 2 is connected to the input port of the ejector valve 7 and the output port of the purge valve 6 through a hole in the input block 16. The output port of the flow control valve 5 is changed in direction by the flow control block 44 and the direction change block 14, and passes through a passage formed in the output valve block 13 to pass through the output valve 3.
Connected to the input port of The output port of the output valve 3 is connected to the output joint 43 through a communication passage provided inside the output valve block 13. The output joint 43 is connected to the output port of another output valve that supplies the supply gas Fb by the output manifold 12 via a communication passage formed inside the output valve block 13. This makes it possible to supply an arbitrary mixed gas Fo by mixing two or more supply gases. Here, the output port of the output valve block 13 and the manifold port 12b of the output manifold 12 are connected between two mounting bolts 41. Thus, even if the output valve block 13 is mounted on the output manifold with only two mounting bolts, gas does not leak from between the output valve block 13 and the output manifold 12. The output joint 43 is connected to an etching device in a semiconductor manufacturing process.

FIG. 9 shows the structure of the ejector 4. The input port 28 of the ejector 4 is connected to the ejector pipe 18. The working fluid input port 27 of the ejector 4 is connected to a nitrogen gas tank via an ejector working fluid valve (not shown). The working fluid input port 27 is in communication with the valve chamber 26. A valve seat 23 is provided in the valve chamber 26, and the valve element 21 is in contact with the valve seat 23. The valve body 21 is fitted and fixed to one end of the movable iron core 20. The movable iron core is urged by a return spring 22 in a direction in which it comes into contact with the valve element 21. The movable iron core 20 is fitted in the hollow portion of the coil 19 so as to be able to linearly move. The central hole of the valve seat 23 is
It communicates with the suction unit 24 via the nozzle 25 and communicates with the discharge unit 29. On the other hand, the input port 28 of the ejector 4 is in communication with the suction unit 24.

Before describing the operation of the overall apparatus, the operation of the ejector 4 having the above configuration will be described. When the coil 19 is excited, the fixed core (not shown) is
Is moved upward. As a result, the valve element 21 is
Separated from 3. Then, the nitrogen gas N as the working fluid passes through the working fluid input port 27, the valve chamber 26, and the valve seat 23,
It flows into the nozzle 25. The flow rate is increased by lowering the pressure at the nozzle 25, and the nitrogen gas N blows out from the suction unit 24 toward the discharge unit 29 at a high flow rate.

The corrosive gas Fa, which is generated by the rapid flow of the nitrogen gas N, is sucked by the negative pressure around the suction portion 24 and the viscosity of the nitrogen gas N and the corrosive gas Fa, and is mixed with the working fluid. And is discharged from the discharge unit 29. The discharged gas passes through a pipe and is stored in an exhaust tank.
At this time, the corrosive gas Fa is changed to nitrogen gas N as a working fluid.
The exhaust gas is discharged after its concentration has been reduced, so that the inside of the exhaust pipe and the exhaust processing apparatus is less likely to corrode.

Next, the structure of the flow control valve 5 will be described with reference to FIG. The flow control valve 5 controls the flow by opening and closing the valve 35 while accurately measuring the mass flow.
The flow control valve 5 has a main passage 39 and a branch passage 40. Among these, the mass flow rate is measured using the conduit 32 provided in the branch passage 40. The main passage 39 is provided with a throttle member 36 for flowing the corrosive gas Fa into the branch passage 40. That is, as a mass flow sensor for measuring a mass flow rate with high accuracy and high responsiveness, a corrosive gas Fa is caused to flow inside a narrow conduit 32, and a pair of self-gases having a large temperature coefficient are provided upstream and downstream of the conduit 32, respectively. A heat sensitive coil 31 around which a heating type temperature measuring element is wound is formed, a bridge circuit is formed by each heat sensitive coil 31, and the temperature of the heat sensitive coil 31 is controlled to a constant value by a current control circuit 37, so that the corrosive gas F
The mass flow rate a is calculated from the potential difference between the bridge circuits, the excitation of the coil 34 is changed by the drive control circuit 38, and the valve body 33 is driven to control the flow rate.

The conduit 32 used at this time is, for example, a tube made of SUS316 having an inner diameter of 0.5 mm and a length of 20 mm. The small inner diameter is for measuring a small amount of fluid gas. Then, two heat-sensitive coils 31 are formed by winding a heat-sensitive resistance wire having a diameter of 25 μm 70 turns on the upstream side and the downstream side of the conduit. The heat-sensitive resistance wire is made of a material having a large temperature coefficient, such as iron or a nickel alloy. The heat-sensitive coil is adhered to the conduit with a UV curing resin or the like, and forms a sensor unit.

Next, the operation of the gas supply device having the above configuration will be described. The corrosive gas Fa flows into the unit from a corrosive gas tank (not shown) via the input joint 42, and flows into the input port of the input valve 2 through a hole in the input block 16. When the input valve 2 opens, the input port and the output port of the input valve 2 communicate. The corrosive gas Fa that has exited the output port of the input valve 2 flows into the input port of the flow control valve 5.

The corrosive gas Fa flowing into the flow control valve 5
Flows into the main passage 39 and the branch passage 40, and merges again. Corrosive gas Fa flowing through the branch passage 40
Is heated by a heat-sensitive coil 31 in which a pair of self-heating type thermometers each having a large temperature coefficient are wound on the upstream side and the downstream side of the conduit 32, respectively. Here, the current control circuit 37 controls the temperature of the heat-sensitive coil 31 to a constant value, calculates the mass flow rate of the corrosive gas Fa from the potential difference between the bridge circuits formed by the heat-sensitive coil 31, and controls the drive control circuit. The excitation of the coil 34 is changed by 38 to drive the valve body 33 to control the flow rate.

The corrosive gas Fa exiting the output port of the flow control valve 5 passes through the flow control valve block 44, the direction change block 14, and a hole provided in the output valve block, and enters the input port of the output valve 3. Flows into the port. Here, since the output valve 3 is opened, the input port and the output port of the output valve 3 communicate with each other. The corrosive gas Fa that has exited the output port of the output valve 3 passes through a hole provided in the output valve block 13 and is mixed with the supply gas Fb that flows in from the output manifold 48, and flows out of the output joint 43. I do. The output joint 43 is connected to an etching device or the like in a semiconductor manufacturing process, and a predetermined amount of the mixed gas Fo is supplied to the etching device or the like. When a predetermined amount of corrosive gas Fa is sent to the etching apparatus or the like by the flow control valve 5, the output valve 3 and the input valve 2 are closed. At this time, the corrosive gas Fa also remains inside the conduit 31 of the flow control valve 5 and the like.

Next, the purge valve 6 is opened and the flow control valve 5 is opened.
The purge gas 6 is closed, the ejector valve 7 is opened, and the ejector 4 is excited to suck the corrosive gas Fa. That is, when the ejector valve 7 and the ejector 4 are excited, the nitrogen gas N, which is a working fluid, flows into the ejector 4, sucks the corrosive gas Fa, and is discharged as a mixed gas. Here, suction by the ejector 4 and inflow of nitrogen gas N by the purge valve 6 are performed alternately. Therefore, the corrosive gas Fa adsorbed on the inner wall surface of the conduit 32 of the flow control valve 5 can be sucked by the ejector 4 while being blown off by the nitrogen gas N, so that the residual gas can be efficiently removed.

FIG. 11 shows the effect. That is, the solid line shows the case where only the purge with the nitrogen gas N is performed without performing the suction by the ejector 4. The residual concentration of the corrosive gas Fa after 1 minute is still 100 ppm or more, and the background value of the nitrogen gas N is 0.05 p.
It takes 36.7 minutes to reach pm. The dotted line shows the nitrogen gas N described in this embodiment.
And the ejector suction was performed 6 times alternately for 2 seconds. The residual concentration of the corrosive gas Fa after 1 minute was 0.68.
ppm in a very short time. The time required for the nitrogen gas N to reach the background value of 0.05 ppm is also reduced to 12.8 minutes. As described above, the ejector 4 is provided in the vicinity of the flow control valve 5, and the purging of the nitrogen gas N and the suction by the ejector 4 are alternately performed. The efficiency of the manufacturing process can be increased.

As described in detail above, according to the mounting structure of the cylindrical on-off valve of this embodiment, the valve supply port for receiving gas supply near the center of the lower surface, and the valve supply port is opened and closed to communicate with the valve supply port. Alternatively, a cylindrical on-off valve 3 having a valve output port to be shut off, a cylindrical on-off valve 3 attached to the upper surface, and an upper surface to which the cylindrical on-off valve 3 is attached is extended in one side direction, and the extended upper surface Using the two bolt holes formed in the output manifold 12 with the mounting bolts 41,
And an output valve block 13 formed with a communication passage for communicating the manifold port 12b with the valve output port. The manifold port 12b is formed between the two mounting bolts 41. Therefore, the output valve block 13 can be fastened to the output manifold 12 with only two mounting bolts, so that the mounting space can be reduced.

In the above embodiment, the case where the purge with the nitrogen gas N and the suction of the residual gas with the ejector 4 are alternately performed has been described. However, the purge and the suction may be performed simultaneously. When a vacuum pump is used, if the corrosive gas Fa is first sucked, the inside of the discharge pipe is exposed to the corrosive gas F having a high concentration, and the pipe is corroded. Corrosive gas F by gas N
Since the concentration of a is reduced and discharged, the suction operation can be performed first.

[0037]

As is apparent from the above description, according to the cylindrical on-off valve mounting structure of the present invention, a valve supply port for receiving gas supply near the center of the lower surface and a valve supply by opening and closing the valve are provided. A cylindrical on-off valve having a valve output port communicated with or shut off from the port, a cylindrical on-off valve attached to the upper surface, the upper surface to which the cylindrical on-off valve is attached is extended in one side direction, and the extended upper surface A mounting block fixed to the manifold plate with mounting bolts using two bolt holes formed in the mounting block, and formed with a communication passage communicating the manifold port with the valve supply port or the valve output port. Since the port is formed between two mounting bolts, the mounting block can be fastened to the manifold plate with only two mounting bolts. Space can be reduced,
The manufacturing apparatus can be made compact.

Further, when the mounting block is tightened by bolts for mounting from above, the gasket is held by the gasket retainer, so that the mounting block can be mounted without lateral displacement of the gasket. Will be higher. In addition, since the gasket is uniformly compressed, it is possible to completely seal and there is no fear that corrosive gas leaks.

[Brief description of the drawings]

FIG. 1 is a side view showing a specific configuration of a gas supply device.

FIG. 2 is an exploded perspective view showing a specific configuration of the gas supply device.

FIG. 3 is an explanatory diagram showing a gas flow of a gas supply device.

FIG. 4 is a circuit diagram showing a configuration of a gas supply device according to one embodiment of the present invention.

FIG. 5 is a plan view and a front view showing the structure of the gasket.

FIG. 6 is a plan view showing a specific configuration of the gasket holding member of the present invention.

FIG. 7 is a plan view showing a specific configuration of a gasket holding member according to a second embodiment of the present invention.

FIG. 8 is an explanatory view showing how to use the gasket holding member.

FIG. 9 is a cross-sectional view illustrating a configuration of an ejector.

FIG. 10 is a sectional view showing a configuration of a flow control valve.

FIG. 11 is a data diagram showing experimental results.

[Explanation of symbols]

 F Corrosive gas N Nitrogen gas 2 Input valve 3 Output valve 4 Ejector 5 Flow control valve 6 Purge valve 7 Ejector valve 8 Gasket 9,10 Gasket retainer 12 Output manifold 12b Manifold port 13 Output valve block 41 Mounting bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihisa Sudo 3-6-3 Uchikanda, Chiyoda-ku, Tokyo CKK2 Inc. CKD2 Building (72) Inventor Kenichi Goto Kodai, Komaki City, Aichi Prefecture 3005 Hayasaki C.K.Ind. (72) Inventor Hiroshi Itato 3005 C.K.A.Kitamaki, Aichi Pref. In company

Claims (1)

[Claims] 1. A cylindrical on-off valve mounting structure for mounting a cylindrical on-off valve on a manifold plate having a manifold port communicating with the cylindrical on-off valve, comprising: a valve supply port for receiving a gas supply in the vicinity of a lower central portion;
A cylindrical on-off valve provided with a valve output port that is communicated with or shut off from a valve supply port by opening and closing the valve; an upper surface on which the cylindrical on-off valve is mounted, and an upper surface on which the cylindrical on-off valve is mounted is in one side direction The bolts are fixed to the manifold plate using two bolt holes formed on the stretched upper surface, and a communication path for communicating the manifold port with the valve supply port or the valve output port is provided. And a mounting block formed, wherein the manifold port is formed between the two mounting bolts.