JPH1069317A - Mass-flow controller fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the fitting structure for a mass-flow controller which is easily replaced. SOLUTION: The fitting structure for the mass-flow controller has a 2nd communication port which (1) has a manifold port 14b for the mass-flow controller formed on the top surfaces of manifold plates 14 and 15 and (2) has fitting blocks 44 and 45 having a 1st communication port for linking with the input or output port of the mass-flow controller 5 on the flank and a 2nd communication port for linking with a manifold port for the mass-flow controller on the bottom surface, communication paths 44a and 45a linking the 1st and 2nd communication ports with each other, and a couple of bolt holes penetrating the top and reverse surfaces, and (3) fitting blocks 44 and 45 are fitted to the manifold plates 14 and 15 from above with four fitting bolts 41 by using the couple of bolt holes.

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 mass flow controller used in a gas supply device used in an industrial manufacturing apparatus such as a semiconductor manufacturing apparatus. It relates to the mounting structure.

[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 mass flow controller having high accuracy and high responsiveness is used. Then, in a mass flow controller or the like for accurately controlling the corrosive gas supply amount, as a mass flow sensor that measures the flow mass with high accuracy and high responsiveness, the corrosive gas flows inside a narrow conduit, and the upstream of the conduit. A pair of self-heating type thermometers with a large temperature coefficient are wound on the side and the downstream side to form a heat-sensitive coil, a bridge circuit is formed by each heat-sensitive coil, and the temperature of the heat-sensitive coil is controlled to a constant value to prevent corrosion. A device that calculates a gas mass flow rate from a potential difference between bridge circuits is used.

[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 mass flow controller and a plurality of on-off valves are used. Here, when the nitrogen gas or the like supplied to the on-off valve is common, the nitrogen gas or the like is supplied by a manifold plate to which the 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 apparatus, a large space is required for arranging a plurality of mass flow controller units, and this goes against the direction in which the manufacturing apparatus is made compact. In addition, since the surrounding devices must be removed to remove the mass flow controller, the maintainability is poor. That is, in the conventional mass flow controller mounting structure, there is a problem that production efficiency deteriorates because it takes time to replace the mass flow controller.

(2) When replacing the mass flow controller, it is formed of a donut-shaped pipe having an opening on the outer peripheral surface to seal a communication hole between the mass flow controller and a block constituting the unit. Use a gasket fitted with a coil spring.
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. Further, since the gasket is a small component, it has been difficult to accurately supply the gasket to a predetermined position on the block. In particular, when a block or the like has an inclination with respect to a horizontal plane,
This is a problem because the gasket easily slips and shifts in position.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an easily replaceable mass flow controller mounting structure.

[0008]

In order to achieve this object, a mounting structure of a mass flow controller according to the present invention has the following configuration. That is, in a mass flow controller mounting structure for mounting a mass flow controller having an input port formed on one side surface and an output port on the opposite side surface to a manifold plate formed with a mass flow controller manifold port, A manifold port is formed on an upper surface of the manifold plate;
A first communication port for communicating with an input port or an output port of the mass flow controller on a side surface, a second communication port for communicating with the mass flow controller manifold port on a bottom surface, a first communication port and a second communication port. A mounting block in which a communication passage communicating with the communication port and a pair of bolt holes penetrating the upper surface and the lower surface are formed; and (3) the mounting block is formed on the manifold plate with a pair of bolt holes. And mounted from above with four mounting bolts.

In the above mounting structure, (4) a gasket in which a coil spring is mounted in a donut-shaped pipe having an opening formed in the outer peripheral surface; and (5) a manifold sandwiching the gasket opening from outside. And (6) a pair of mounting bolts are located point-symmetrically about the gasket.

[0010] The mass flow controller of the gas supply apparatus of the present invention having the above-described configuration 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 mass flow controller, a thin pipe is used to measure a flow rate with high accuracy and a high response speed. Further, a first opening / closing valve and a second opening / closing valve, which are integrated with the mass flow controller on both sides of the mass flow controller, pass or cut off the flow of the supply gas. Further, the replacement gas supply means is located between the first and second on-off valves,
Supply the replacement gas to the mass flow controller. Also,
An ejector, which is an exhaust means, is also located between the first and second on-off valves and near the mass flow controller, and depressurizes the supply gas remaining in the mass flow controller.

The first on-off valve and the second on-off valve 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 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 mass flow controller is replaced will be described. The mass flow controller has a pair of
It can be easily removed simply by removing the four screws. When a new mass flow controller is installed, a new gasket is used for sealing the periphery of the flow path hole between the block constituting the unit and the mass flow controller. 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. Also,
Since the gasket holding member has a slightly concave portion at a fixed position sandwiching the gasket, the gasket is held accurately 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. 4 is a circuit diagram showing a configuration of the gas supply device 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 on-off valve and a mass flow for measuring a flow rate of the corrosive gas Fa and supplying a fixed amount of the corrosive gas Fa. A controller 5 and an output valve 3 as a second on-off valve are connected in series. An input port of the mass flow controller 5 has an ejector 4 serving as a supply gas exhaust unit via an ejector valve 7, and a nitrogen gas tank storing an inert gas nitrogen gas as a replacement gas via a purge valve 6. (Not shown) are connected. The output port of the output valve 3 is connected to the output port of an output valve for the corrosive gas Fb, which is another supply gas, and the corrosive gases Fa and Fb are mixed to form a mixed gas Fo.
Supplied to the manufacturing process.

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 mass flow controller 5, there are blocks for changing the direction of the flow path, and a mass flow controller block 4 for screwing the unit with screws 41 from above.
4, 45 are fastened with screws from the lateral direction. Below the mass flow controller block 44, a direction changing block 14 for changing the direction of the flow path is provided with an output valve block 13
Screwed from the right. The output valve 3 is screwed to the output valve block 13 as an attachment block from above. An output joint 43 is attached to the output valve block 13 from the left. The upper surface of the output valve block 13 to which the output valve 3 serving as the on-off valve is attached extends in one side direction, and two bolt holes are formed in the extended upper surface. The output valve block 13 is an output manifold 1 that is a manifold plate screwed to the base plate 48 from below.
2, two bolts 41 from above using the bolt holes.
Has been concluded. 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.

The mass flow controller block 4
Below 5, 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 each bolted. Also, input valve block 1
An input joint 42 is attached to 6 from the right. Further, the input valve block 16 includes a base plate 48.
Each is bolted from below to the purge manifold 46 and the ejector manifold 47, each of which is a manifold plate, and is fastened from above by two mounting bolts. The ejector 4 is connected to one end of the ejector manifold 47 via the ejector pipe 18. One end of the purge manifold 46 is connected to a nitrogen gas tank (not shown) that stores nitrogen gas, which is an inert gas.

As shown in FIG. 2, the mass flow controller blocks 44, 45 and the direction change blocks 14,
15, the gasket 8 and the gasket retainer 1
0 is attached. FIG. 5 shows the structure of the gasket 8 used for the corrosive gas Fa or the like. (A) is a plan view and (b) is a side view. In the gasket 8, a pipe whose one side is opened forms a circle. At this time, the opening 8a is located on the outer periphery. A spring 8b wound in a coil shape is mounted in the pipe.

Here, a case where the mass flow controller 5 is replaced will be described. Mass flow controller 5
Can be easily removed from the unit by removing the two screws 41 on both sides upward. Next, a new mass flow controller 5 is attached. 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,
The opening of the gasket 8 is engaged with the recess 10b. Thereby, the gasket 8 is connected to the gasket retainer 1.
It is positioned with respect to 0.

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 mass flow controller 5 is mounted, the pair of bent portions 10 of the gasket retainer 10 in which the gasket 8 is
e, 10f are set so as to sandwich the outside of the direction change blocks 14, 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. Thereby, the gasket 8 is connected to the gas holes 14 of the direction change blocks 14 and 15.
b, 15b.

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 mass flow controller block 44. The thickness of the gasket 8 is 1.6 mm. Each of the direction changing block 14 and the mass flow controller block 44 has a depth of 0.1 mm for the gasket retainer 10.
The counterbore 44b, 14c of 5 mm is formed. The thickness of the gasket retainer 10 is 0.3 mm.
Is crushed by 0.3 mm. At this time, the gasket 8 and the counterbore portions 44b and 14c have play, but since the gasket 8 is held by the gasket retainer 10, the gasket 8 does not shift laterally, and the mass flow controller 5 can be attached. Therefore, the gas-tightness of the gasket 8 is improved. 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 mass flow controller 5. The output valve 3 used in the present embodiment,
Each of the input valve 2, the ejector valve 7, and the purge valve 6 is a normal solenoid valve, and has 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 mass flow controller 5
The direction is changed by the flow control block 44 and the direction change block 14, and the flow is connected to the input port of the output valve 3 through a passage formed inside the output valve block 13. The output port of the output valve 3 is connected to the output valve block 1
3 through the communication passage provided inside the output joint 4.
3 is connected. The output joint 43 is connected to an 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
It is connected between two mounting bolts 41. Thereby, the output valve block 13 is moved to the output manifold.
Even if it is mounted 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 configuration of the mass flow controller 5 will be described with reference to FIG. The mass flow controller 5
The flow rate is controlled by opening and closing the valve 35 while accurately measuring the mass flow rate. The mass flow controller 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 thermometer 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, and the mass of the corrosive gas Fa is increased. The flow rate 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 mass flow controller 5.

The corrosive gas Fa that has flowed into the mass flow controller 5 is divided into the main passage 39 and the branch passage 40, and merges again. The corrosive gas Fa flowing through the branch passage 40 is heated by the heat-sensitive coil 31 in which a pair of self-heating type temperature measuring elements 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
However, the temperature of the heat-sensitive coil 31 is controlled to a constant value, the mass flow rate of the corrosive gas Fa is calculated from the potential difference between the bridge circuits formed by the heat-sensitive coil 31, and the drive control circuit 38 excites the coil 34. Then, the valve 33 is driven to control the flow rate.

The corrosive gas Fa exiting the output port of the mass flow controller 5 passes through the holes provided in the mass flow controller block 44, the direction change block 14, and the output valve block, and enters the input port of the output valve 3. Inflow. 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 mass flow controller 5, the output valve 3
And the input valve 2 is closed. At this time, the corrosive gas Fa also remains inside the conduit 31 of the mass flow controller 5.

Next, the purge valve 6 is opened to allow nitrogen gas N to flow into the mass flow controller 5, and then the purge valve 6 is closed, the ejector valve 7 is opened, and the ejector 4 is excited to cause corrosion. The volatile gas Fa is sucked. 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,
The suction by the ejector 4 and the inflow of the nitrogen gas N by the purge valve 6 are performed alternately. Therefore, the corrosive gas Fa adsorbed on the inner wall of the conduit 32 of the mass flow controller 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 mass flow controller 5, and the purging of the nitrogen gas N and the suction by the ejector 4 are alternately performed. The efficiency of the process can be increased.

As described in detail above, according to the on-off valve mounting structure of the present embodiment, the valve supply port for receiving gas supply near the center of the lower surface, and the valve supply port communicating or shutting off by opening and closing the valve. Opening and closing valve 3 having a valve output port to be opened and closed, and the upper surface to which the opening and closing valve 3 is attached is extended in one side direction, and two bolt holes are formed in the extended upper surface. Using the mounting bolt 41
And an output valve block 13 formed with a communication passage connecting the manifold port 12b and the valve output port. The manifold port 12b is provided between the two mounting bolts 41. Since the output valve block 13 is formed, 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 mounting structure of the mass flow controller of the present invention,
(1) A manifold port for a mass flow controller is formed on an upper surface of a manifold plate, (2) a first communication port for communicating with an input port or an output port of the mass flow controller on a side surface, and a manifold port for a mass flow controller on a bottom surface. A second communication port for communicating with the second communication port, a communication passage communicating the first communication port with the second communication port, and a pair of bolt holes penetrating the upper surface and the lower surface. And
(3) Attach the mounting block to the manifold plate
The mass flow controller can be fastened to the manifold plate from above with only four mounting bolts because the mounting is performed from above with four mounting bolts using a pair of bolt holes, so the mass flow controller can be replaced easily and in a short time. be able to.

Further, since the gasket is held by the gasket retainer when the mass flow controller is bolted for mounting from above, 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 showing a configuration of an ejector.

FIG. 10 is a cross-sectional view illustrating a configuration of a mass flow controller.

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 Mass flow controller 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 KK CK2 Second Building (72) Inventor Kenichi Goto 850 Horinouchicho, Kasugai-shi, Aichi Prefecture (72) Inventor Hiroshi Itoh 850 Horinouchi-cho, Kasugai-shi, Aichi Prefecture In-house Kasugai Office (72) Inventor Akihiro Kojima 850, Horinouchi-cho, Kasugai-shi, Aichi Prefecture Kasugai Corporation In business office

Claims (2)

[Claims] 1. A mass flow controller mounting structure for mounting a mass flow controller having an input port formed on one side surface and an output port on an opposite side surface to a manifold plate formed with a mass flow controller manifold port. Manifold port
A first communication port formed on an upper surface of the manifold plate, a side surface communicating with the input port or the output port of the mass flow controller, and a second communication surface communicating with the mass flow controller manifold port on a bottom surface. A port, a communication passage communicating the first communication port and the second communication port,
A mounting block formed with a pair of bolt holes penetrating an upper surface and a lower surface, wherein the mounting block is mounted on the manifold plate with four mounting bolts from above using the pair of bolt holes; A mass flow controller mounting structure characterized by being mounted. 2. The mounting structure according to claim 1, wherein a gasket in which a coil spring is mounted in a donut-shaped pipe having an opening formed in an outer peripheral surface, and wherein the gasket opening is sandwiched from outside. A gasket holding member for holding the manifold at a position surrounding the manifold port, wherein the pair of mounting bolts are located point-symmetrically about the gasket.