Patent Publication Number: US-2023134421-A1

Title: Vaporization system

Description:
TECHNICAL FIELD 
     The present invention relates to a vaporization system for vaporizing a liquid material. 
     BACKGROUND ART 
     Conventionally, a vaporization system for vaporizing a liquid material is used to generate gas used in a semiconductor manufacturing process such as, for example, a film formation process (for example, Patent Literature 1). In general, this vaporization system includes, in a casing, a plurality of units such as a vaporization unit that vaporizes the liquid raw material, and a mass flow controller that controls a flow rate of gas generated through vaporization. The casing is provided with an inlet port through which the liquid material is introduced and an outlet port through which the vaporized gas generated by vaporizing the liquid material is discharged. The inlet port and the outlet port are caused to communicate with pipes of a semiconductor manufacturing line, and thus it is possible to supply the gas at a predetermined flow rate to a process chamber in which the semiconductor manufacturing process is performed. 
     This vaporization system is often used by being fixed on a base member or the like in a process room. In a conventional method of fixing the vaporization system, as illustrated in  FIG.  10   , each of the inlet port and the outlet port of a vaporization device is caused to communicate with a corresponding one of internal flow paths formed in the base member. Then, the inlet port and the outlet port are screwed and fixed with seal members interposed therebetween. In this manner, the vaporization device is fixed onto the base member. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: JP 2016-122841 A 
       
    
     SUMMARY OF INVENTION 
     Technical Problems 
     However, in the conventional method of fixing the vaporization device described above, each common fixing screw is used both for fixing the vaporization device onto the base member and for tightening each seal member. Thus, weight of the vaporization device is applied to each seal member. As a result, non-uniformity may occur in tightening surface pressure applied to the seal members, and thus sealing performance may be reduced. 
     Therefore, the present invention has been made to solve the above problems, and it is a main object of the present invention to reduce weight of a vaporization device applied to a screw with which a seal member is tightened, and to reduce non-uniformity in tightening surface pressure applied to the seal member, thereby improving sealing performance. 
     Solution to Problem 
     That is, a vaporization system according to the present invention includes: a vaporization device that is configured to vaporize a liquid material and that includes an inlet port through which the liquid material is introduced and an outlet port through which vaporized gas generated by vaporizing the liquid material is discharged; at least one first fixing screw with which at least one of the inlet port or the outlet port is screwed and fixed onto a base; at least one pipe member that is configured to communicate with the fixed port and through which the vaporized gas or the liquid material flows; and at least one second fixing screw with which the at least one pipe member is screwed and fixed onto the fixed port with a seal member interposed between the at least one pipe member and the fixed port. 
     According to this configuration, there are separately provided the screw (the at least one first fixing screw) with which the port and the base are tightened and thus the vaporization device is fixed onto the base, and the screw (the at least one second fixing screw) with which the port and the at least one pipe member are tightened and sealed. Thus, it is possible to cause the at least one first fixing screw to mainly support weight of the vaporization device, and therefore to reduce weight of the vaporization device applied to the at least one second fixing screw used for forming the seal. As a result, it is possible to reduce non-uniformity in tightening surface pressure applied to the seal member by the at least one second fixing screw, therefore improving sealing performance. 
     A specific configuration of the vaporization system includes the following one. That is, the fixed port includes a mounting surface that is configured to be mounted onto the base, and a pipe member mounting surface onto which the at least one pipe member is configured to be mounted so as to communicate with the pipe member mounting surface. In the fixed port, the mounting surface and the pipe member mounting surface are formed on different surfaces. 
     In the vaporization system, the pipe member mounting surface is preferably formed on a surface opposite to the mounting surface, in the fixed port. 
     With this configuration, a user can screw the at least one pipe member onto the port in a posture facing a mounting surface on the base. Thus, it is possible to improve efficiency in mounting the at least one pipe member onto the vaporization device. This effect is more noticeably exhibited when mounting operation is performed in a narrow space, for example, where a plurality of vaporization systems is arranged. 
     In the vaporization system, each of the inlet port and the outlet port is preferably screwed on the base with a corresponding one of a plurality of first fixing screws, each identical to the at least one first fixing screw. The at least one pipe member preferably includes an inlet-side pipe member that is configured to communicate with the inlet port and through which the liquid material flows, and an outlet-side pipe member that is configured to communicate with the outlet port and through which the vaporized gas flows. Each of the inlet-side pipe member and the outlet-side pipe is preferably screwed on a corresponding one of the ports with a corresponding one of a plurality of second fixing screws, each identical to the at least one second fixing screw, with a corresponding one of seal members interposed between each of the inlet-side pipe member and the outlet-side pipe, and the corresponding one of the ports. 
     According to this configuration, both the inlet port and the outlet port are screwed onto the base with the plurality of first fixing screws. Thus, it is possible to reduce weight of the vaporization device applied to the plurality of second fixing screws used for forming seals in both the inlet port and the outlet port. Therefore, it is possible to further reduce non-uniformity in tightening surface pressure applied to the seal members by the plurality of second fixing screws, thereby improving sealing performance. 
     The effects of the present invention become more noticeable as a component of weight of the vaporization device applied to the first fixing screw with respect to the total weight of the vaporization device increases. 
     An aspect in which the effects of the present invention are more noticeably exhibited is, for example, the following one. That is, the inlet port is provided on one end side of the vaporization device, and the outlet port is provided on the other end side of the vaporization device. Then, the vaporization device is fixed on the base in a state where the inlet port and the outlet port are positioned one below the other or vice versa in a vertical direction. 
     An aspect in which the effects of the present invention are further noticeably exhibited is the following one. That is, the respective mounting surfaces of the inlet port and the outlet port are formed so as to be parallel to the vertical direction. 
     In the vaporization system, the at least one pipe member preferably includes at least one external pipe, and at least one communication member through which the at least one external pipe and the fixed port are caused to communicate with each other. The at least one communication member preferably has one end that is screwed on the fixed port and the other end that is screwed on the at least one external pipe. 
     With this configuration, the at least one pipe member includes the plurality of component members. Thus, it is possible to increase a degree of freedom in designing the at least one pipe member. 
     The effects of the present invention described above become more noticeable as the weight of the vaporization device increases. 
     An aspect in which the effects of the present invention are more noticeably exhibited is, for example, the following one. That is, the vaporization device includes a vaporizer that is configured to vaporize the liquid material, and a supply rate controller that is configured to control a supply rate of the liquid material to the vaporizer. 
     Another aspect in which the effects of the present invention are more noticeably exhibited is, for example, the following one. That is, the vaporization device further includes a mass flow controller that is configured to control a flow rate of vaporized gas generated by vaporizing in the vaporizer. 
     A method of fixing a vaporization device according to the present invention is a method of fixing, onto a base, a vaporization device that is configured to vaporize a liquid material and that includes an inlet port through which the liquid material is introduced and an outlet port through which vaporized gas generated by vaporizing the liquid material is discharged. The method includes: screwing and fixing at least one of the inlet port or the outlet port onto a base; and screwing and fixing, onto the fixed port, at least one pipe member that is configured to communicate with the fixed port and through which the vaporized gas or the liquid material flows, with a seal member interposed between the at least one pipe member and the fixed port. 
     According to the method of fixing the vaporization device, it is possible to achieve the same operation and effects as those in the vaporization system according to the present invention, which has been described above. 
     Advantageous Effects of Invention 
     According to the present invention configured as described above, it is possible to reduce weight of a vaporization device applied to a screw with which a seal member is tightened, and to reduce non-uniformity in tightening surface pressure applied to the seal member, therefore improving sealing performance. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic view illustrating a configuration of a vaporization system according to the present embodiment. 
         FIG.  2    is a plan view illustrating the configuration of the vaporization system according to the embodiment, as viewed toward a device mounting surface. 
         FIG.  3    is an exploded view illustrating the vaporization system according to the embodiment. 
         FIG.  4    is a schematic view illustrating a configuration of a vaporization system according to another embodiment. 
         FIG.  5    is a schematic view illustrating a configuration of a vaporization system according to still another embodiment. 
         FIG.  6    is a plan view illustrating the configuration of the vaporization system according to the still other embodiment, as viewed toward a device mounting surface. 
         FIG.  7    is a schematic view illustrating another configuration of the vaporization system according to the still other embodiment. 
         FIG.  8    is a plan view illustrating the other configuration of the vaporization system according to the still other embodiment, as viewed toward the device mounting surface. 
         FIG.  9    is a schematic view illustrating a configuration of a vaporization system according to yet another embodiment. 
         FIG.  10    is a schematic view illustrating a configuration of a conventional vaporization system. 
     
    
    
     LIST OF REFERENCE CHARACTERS 
     
         
         
           
               100  vaporization system 
               1  vaporization device 
               41   i ,  41   o  first fixing screw 
               42   i  inlet-side pipe member 
               42   o  outlet-side pipe member 
               43   i ,  43   o  second fixing screw 
             F base member 
             S seal member 
             P i  inlet port 
             P O  outlet port 
             B main body block 
           
         
       
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of a vaporization system according to the present invention will be described with reference to the drawings. 
     A vaporization system  100  according to the present embodiment is used for supplying gas at a predetermined flow rate to a process chamber, which is incorporated, for example, on a semiconductor manufacturing line or the like, and in which a semiconductor manufacturing process is performed. Specifically, the vaporization system  100  includes a vaporization device  1  that vaporizes a liquid material, and a connection mechanism  4  that fixes the vaporization device  1  on a base member F and that connects the vaporization device  1  to the semiconductor manufacturing line. 
     As illustrated in  FIG.  1   , the vaporization device  1  includes a vaporization unit  2  that vaporizes the liquid raw material, and a mass flow controller  3  that controls a flow rate of gas generated through vaporization in the vaporization unit  2 . The vaporization device  1  includes a casing C having a substantially pillar shape (specifically, a substantially rectangular parallelepiped shape) and having a longitudinal direction. The casing C houses the vaporization unit  2  and the mass flow controller  3 . An inlet port P i  through which the liquid material is introduced is provided on one end side in the longitudinal direction of the casing C. An outlet port P o  through which the vaporized gas is discharged is provided on the other end side in the longitudinal direction of the casing C. As illustrated in  FIG.  2   , in the vaporization system  100  according to the present embodiment, a plurality of vaporization devices  1  is provided. The plurality of vaporization devices  1  is fixed side by side so as to stand on a device mounting surface Fx of the base member F. 
     The vaporization unit  2  includes a vaporizer  21 , a supply flow rate controller  22 , and a preheater  23 . The vaporizer  21  vaporizes the liquid material using a baking method. The supply flow rate controller  22  controls a supply rate of the liquid material to the vaporizer  21 . The preheater  23  preheats the liquid material supplied to the vaporizer  21  to a predetermined temperature. 
     The vaporizer  21 , the supply flow rate controller  22 , and the preheater  23  are mounted on a unit mounting surface Bx set on one surface of a main body block B, which is a manifold block and in which flow paths are formed. Herein, the main body block B is made of metal such as stainless steel, for example. The main body block B has a substantially pillar shape (specifically, a substantially rectangular parallelepiped shape) and has a longitudinal direction. The unit mounting surface Bx is a surface having a rectangular shape and having a longitudinal direction. The main body block B is mounted on the casing C while the longitudinal direction of the main body block B faces the longitudinal direction of the casing C. 
     Specifically, the preheater  23 , the supply flow rate controller  22 , and the vaporizer  21  are mounted on the unit mounting surface Bx while being arranged in a line along the longitudinal direction. The preheater  23 , the supply flow rate controller  22 , and the vaporizer  21  are connected in series in this order from an upstream side, through the internal flow paths formed in the main body block B. An upstream side opening of the internal flow path of the main body block B is connected to the liquid material inlet port P i  provided on a surface of one end in the longitudinal direction of the main body block B. 
     The vaporizer  21  includes a storage container and a vaporization heater (not illustrated). The storage container is a vaporization tank having a space for storing the liquid material therein. The vaporization heater is provided in the storage container, and is used for vaporizing the liquid material. 
     The supply flow rate controller  22  is a control valve that controls a supply flow rate of the liquid material to the vaporizer  21 , and is specifically an electromagnetic on-off valve. A controller (not illustrated) controls (for example, performs on/off control of) the electromagnetic on-off valve  22  based on a detection signal from a liquid level sensor provided in the storage container of the vaporizer  21 . The control is performed such that the liquid material stored in the storage container is maintained constantly at a predetermined volume. As a result, the liquid material is intermittently supplied to the vaporizer  21 . 
     The preheater  23  is configured to heat the liquid material to a temperature immediately prior to vaporization (a temperature just lower than a boiling point) by using a preheating heater (not illustrated). 
     With the vaporization unit  2  configured as described above, the liquid material introduced from the liquid material inlet port P i  is preheated to a predetermined temperature as a result of flowing through a flow path in the preheater  23 . The liquid material preheated by the preheater  23  is intermittently introduced into the vaporizer  21  by the control of the electromagnetic on-off valve  22 , which serves as a supply rate controller. Then, in the vaporizer  21 , a state is achieved in which the liquid material is constantly stored therein, and the liquid material is vaporized, so that vaporized gas is continuously generated by the vaporization, without being affected by the control of the electromagnetic on-off valve  22 . The vaporized gas is then continuously discharged to the mass flow controller  3 . 
     Next, the mass flow controller  3  will be described. 
     The mass flow controller  3  includes fluid detectors  31  that detect the vaporized gas flowing through the flow path, and a flow rate control valve  32  that controls a flow rate of the vaporized gas flowing through the flow path. Each of the fluid detectors  31  is, for example, a capacitance type pressure sensor, and detects a corresponding one of respective pressures on an upstream side and a downstream side of a fluid resistor provided in the flow path. The flow rate control valve  32  is a control valve that controls the flow rate of the vaporized gas generated in the vaporizer  21 , and is a piezo valve in the present embodiment. 
     The fluid detectors  31  and the flow rate control valve  32  are mounted on the unit mounting surface Bx. Specifically, the flow rate control valve  32  and the fluid detectors  31  are mounted on the unit mounting surface Bx while being arranged in a line along the longitudinal direction thereof. The flow rate control valve  32  and the fluid detectors  31  are connected in series in this order from the upstream side, through the internal flow path formed in the main body block B. 
     In the present embodiment, an upstream-side pressure sensor  5  and an on-off valve  6  are provided on the upstream side of the mass flow controller  3 . A downstream side opening of the internal flow path of the main body block B is connected to the vaporized gas outlet port P o  provided on a surface of the other end in the longitudinal direction of the main body block B. 
     The connection mechanism  4  fixes the vaporization device  1  on the device mounting surface Fx of the base member F. The fixation is made in a state where the longitudinal direction of the vaporization device  1  faces the upper-lower direction (vertical direction), and the inlet port P i  and the outlet port P o  are positioned one below the other (herein, the inlet port P i  is positioned on a lower side of the outlet port P o , and the outlet port P o  is positioned on an upper side of the inlet port P o . Herein, the device mounting surface Fx is formed on the base member F so as to be parallel to the vertical direction. 
     Specifically, as illustrated in  FIG.  3   , the connection mechanism  4  includes first fixing screws  41 , an inlet-side pipe member  42   i , an outlet-side pipe member  42   o , and second fixing screws  43 . With the first fixing screws  41 , the inlet port P i  and the outlet port P o  are screwed and fixed onto the base member F. The inlet-side pipe member  42   i  communicates with the inlet port P i  and includes an internal flow path, formed therein, through which the liquid material flows. The outlet-side pipe member  42   o  communicates with the outlet port P o  and includes an internal flow path, formed therein, through which the vaporized gas flows. With the second fixing screws  43 , each of the inlet-side pipe member  42   i  and the outlet-side pipe member  42   o  is screwed and fixed onto a corresponding one of the ports with a corresponding one of seal members S interposed therebetween. 
     Each of the inlet port P i  and the outlet port P o  has a block shape in which an internal flow path is formed. The inlet port P i  and the outlet port P o  include mounting surfaces P i x, P o x, respectively. The mounting surfaces P i x, P o x are to be mounted on the device mounting surface Fx of the base member F. In the inlet port P i , through-holes P i h are formed, and in the outlet port P o , through-holes P o h are formed. The through-holes P i h penetrate from the mounting surface P i x toward a surface opposite thereto, and the through-holes P o h penetrate from the mounting surface P o x toward a surface opposite thereto. The first fixing screws  41  are inserted into the through-holes P i h, P o h such that the insertion is made from the respective surfaces, on the ports P i , P o , opposite to the mounting surfaces P i x, P o x. Then, tips of the first fixing screws  41  are screwed into screw holes formed on the device mounting surface Fx of the base member F. With this screwing, tightening is performed between each of the respective mounting surfaces P i x, P o x of the ports P i , P o , and the device mounting surface Fx of the base member F. Herein, the through-holes P i h, P o h and the screw holes are formed such that the first fixing screws  41  are screwed in a manner orthogonal to the mounting surface Fx of the base member F. 
     In the inlet port P i  and the outlet port P o , pipe member mounting surfaces P i y, P o y are formed, respectively. The pipe member mounting surfaces P i y, P o y are formed on respective surfaces different from the mounting surfaces P i x, P o x. A corresponding one of the pipe members is to be mounted onto each of the pipe member mounting surfaces P i y, P o y so as to communicate therewith. Herein, the respective pipe member mounting surfaces P i y, P o y of the ports P i , P o  are formed on the respective surfaces opposite to the mounting surfaces P i x, P o x. An inlet opening, through which the liquid material is introduced, is formed on the pipe member mounting surface P i y of the inlet port P i . An outlet opening, through which the vaporized gas is discharged, is formed on the pipe member mounting surface P o y of the outlet port P o . 
     The inlet-side pipe member  42   i  and the outlet-side pipe member  42   o  are configured such that the internal flow paths thereof extend in the upper-lower direction along the device mounting surface Fx of the base member F. The pipe members  42   i ,  42   o  have respective first mounting surfaces  42   i x,  42   o x to be mounted on the respective pipe member mounting surfaces P i y, P o y of the corresponding, respective ports. One end of the internal flow path is opened on each of the first mounting surfaces  42   i x,  42   o x. A configuration is made such that when the respective first mounting surfaces  42   i x,  42   o x of the pipe members  42   i ,  42   o  are mounted onto the respective pipe member mounting surfaces P i y, P o y of the corresponding, respective ports, each of the internal flow paths communicates with a corresponding one of the inlet opening and the outlet opening. 
     In the inlet-side pipe member  42   i , through-holes  42   i h are formed, and in the outlet-side pipe member  42   o , through-holes  42   o h are formed. The through-holes  42   i h penetrate from the first mounting surface  42   i x toward a surface opposite thereto, and the through-holes  42   o h penetrate from the first mounting surface  42   o x toward a surface opposite thereto. The second fixing screws  43  are inserted into the through-holes  42   i h,  42   o h such that the insertion is made from the respective surfaces, in the pipe members  42   i ,  42   o , opposite to the first mounting surfaces  42   i x,  42   o x. Then, tips of the second fixing screws  43  are screwed into screw holes, formed on the respective pipe member mounting surfaces P i y, P o y of the corresponding ports P i , P o . With this screwing, tightening and sealing are performed between each of the respective first mounting surfaces  42   i x,  42   o x of the pipe members  42   i ,  42   o , and the corresponding one of the respective pipe member mounting surfaces P i y, P o y of the ports P i , P o , with a corresponding one of the seal members S interposed therebetween. Herein, the through-holes  42   i h,  42   o h and the screw holes are formed such that the second fixing screws  43  are screwed in a manner orthogonal to the device mounting surface Fx of the base member F. 
     In the present embodiment, each of the inlet-side pipe member  42   i  and the outlet-side pipe member  42   o  includes a plurality of component members. Specifically, as illustrated in  FIG.  3   , the inlet-side pipe member  42   i  includes an inlet-side external pipe  421   i , and an inlet-side communication member  422   i . The inlet-side external pipe  421   i , communicates with a liquid supply line through which the liquid material flows. Through the inlet-side communication member  422   i , the inlet-side external pipe  421   i , and the inlet port P i  are caused to communicate with each other. The outlet-side pipe member  42   o  includes an outlet-side external pipe  421   o  and an outlet-side communication member  422   o . The outlet-side external pipe  421   o  communicates with the process chamber. Through the outlet-side communication member  422   o , the outlet-side external pipe  421   o  and the outlet port P o  are caused to communicate with each other. 
     Each of the external pipes  421   i ,  421   o  has a pillar shape in which an internal flow path is formed, and is mounted on the device mounting surface Fx of the base member F such that each of the internal flow paths faces the vertical direction. The external pipes  421   i ,  421   o  have respective communication member mounting surfaces  421   i y,  421   o y, formed on respective surfaces opposite to mounting surfaces  421   i x,  421   o x, which are to be mounted to the base member F. A corresponding one of the communication members is to be mounted onto each of the communication member mounting surfaces  421   i y,  421   o y. One end of the internal flow path is opened on each of the communication member mounting surfaces  421   i y,  421   o y. 
     Each of the communication members  422   i ,  422   o  has a block shape in which an internal flow path is formed. The communication members  422   i ,  422   o  have the first mounting surfaces  42   i x,  42   o x described above, and second mounting surfaces  422   i x,  422   o x, respectively. The second mounting surfaces  422   i x,  422   o x are to be mounted onto the respective communication member mounting surfaces  421   i y,  421   o y of the corresponding, respective external pipes. Herein, the first mounting surface  42   i x and the second mounting surface  422   i x are formed at different positions within the same surface in the communication member  422   i  while the first mounting surface  42   o x and the second mounting surface  422   o x are formed at different positions within the same surface in the communication member  422   o . The one end of the internal flow path is opened on each of the first mounting surfaces  42   i x,  42   o x. The other end of the internal flow path is opened on each of the second mounting surfaces  422   i x,  422   o x. Thus, a configuration is made such that when the respective first mounting surfaces  42   i x,  42   o x of the communication members  422   i ,  422   o  are mounted onto the corresponding, respective pipe member mounting surfaces P i y, P o y of the corresponding ports P i , P o , each of the respective internal flow paths of the communication members communicates with the corresponding one of the inlet opening of the port P i  and the outlet opening of the port P o . Then, the configuration is also made such that when the second mounting surfaces  422   i x,  422   o x are mounted to the respective communication member mounting surfaces  421   i y,  421   o y of the corresponding, respective external pipes  421   i ,  421   o , each of the respective internal flow paths formed in the communication members  422   i ,  422   o  communicates with the corresponding one of the respective internal flow paths formed in the external pipes  421   i ,  421   o . 
     Herein, the connection mechanism  4  further includes third fixing screws  44 , with which each of the inlet-side communication member  422   i  and the outlet-side communication member  422   o  is screwed and fixed onto the corresponding one of the external pipes  421   i ,  421   o , with a corresponding one of seal members S interposed therebetween. 
     In the inlet-side communication member  422   i , through-holes  422   i h are formed, and in the outlet-side communication member  422   o , through-holes  422   o h are formed. The through-holes  422   i h penetrate from the second mounting surface  422   i x toward a surface opposite thereto, and the through-holes  422   o h penetrate from the second mounting surface  422   o x toward a surface opposite thereto. The third fixing screws  44  are inserted into the through-holes  422   i h,  422   o h such that the insertion is made from the respective surfaces, on the communication members  422   i ,  422   o , opposite to the second mounting surfaces  422   i x,  422   o x. Then, tips of the third fixing screws  44  are screwed into screw holes, formed on the respective communication member mounting surfaces  421   i y,  421   o y of the corresponding external pipes  421   i ,  421   o . With this screwing, tightening and sealing are performed between each of the respective second mounting surfaces  422   i x,  422   o x of the communication members  422   i ,  422   o , and a corresponding one of the respective communication member mounting surfaces  421   i y,  421   o y of the external pipes  421   i ,  421   o , with the corresponding one of the seal members S interposed therebetween. The through-holes  422   i h,  422   o h and the screw holes are formed such that the third fixing screws  44  are screwed in a manner orthogonal to the device mounting surface Fx of the base member F. 
     According to the vaporization system  100  in accordance with the present embodiment configured as described above, there are separately provided the first fixing screws  41  with which the ports P i , P o  and the base member F are tightened and thus the vaporization device  1  is fixed onto the base, and the second fixing screws  43  with which each of the ports P i , P o  and the corresponding one of the pipe members  42   i ,  42   o  are tightened and sealed. Thus, it is possible to cause the first fixing screws  41  to mainly support weight of the vaporization device  1 , and therefore to reduce weight of the vaporization device  1  applied to the second fixing screws  43  used for forming the seals. As a result, it is possible to reduce non-uniformity in tightening surface pressure applied to the seal members S by the second fixing screws  43 , thereby improving sealing performance. 
     The present invention is not limited to the above embodiment. 
     For example, in the vaporization system  100  according to the above embodiment, each of the inlet-side pipe member  42   i  and the outlet-side pipe member  42   o  includes the plurality of component members. However, the present invention is not limited to this configuration. In a vaporization system  100  according to another embodiment, each of the inlet-side pipe member  42   i  and the outlet-side pipe member  42   o  may be formed of a single component member, as illustrated in  FIG.  4   . 
     In the vaporization system  100  according to the above embodiment, the pipe member mounting surfaces P i y, P o y are formed on the respective surfaces opposite to the respective mounting surfaces P i x, P o x, in the inlet port P i  and the outlet port P o . However, the present invention is not limited to this configuration. Each of the pipe member mounting surfaces P i y, P o y may be formed at any position, as long as each of the pipe member mounting surfaces P i y, P o y is formed at a position different from a position of the corresponding one of the mounting surfaces P i x, P o x. 
     For example, in a vaporization system  100  according to still another embodiment, the pipe member mounting surfaces P i y, P o y may be formed so as to intersect (for example, be orthogonal to) the mounting surfaces P i x, P o x, in the inlet port P i  and the outlet port P o , respectively. Specifically, the pipe member mounting surfaces P i y, P o y may be formed so as to intersect the mounting surfaces P i x, P o x, respectively, and so as to intersect the longitudinal direction of the vaporization device  1 , as illustrated in  FIGS.  5  and  6   . Alternatively, the pipe member mounting surfaces P i y, P o y may be formed so as to intersect the mounting surfaces P i x, P o x, respectively, and so as to be parallel to the longitudinal direction of the vaporization device  1 , as illustrated in  FIGS.  7  and  8   . 
     In the vaporization system  100  according to the above embodiment, each of the inlet port P i  and the outlet port P o  is connected to the semiconductor manufacturing line through the corresponding one of the pipe members  42 . However, the present invention is not limited to this configuration. In a vaporization system  100  according to yet another embodiment, only one of the inlet port P i  and the outlet port P o  may be connected to the semiconductor manufacturing line through the corresponding one of the pipe members  42 . For example, as illustrated in  FIG.  9   , the inlet port P i  (or the outlet port P o ) may be screwed and fixed onto the base member F with fixing screws  7 , with a seal member interposed therebetween, to be caused to communicate with an internal flow path formed in the base member F. 
     The vaporization system  100  according to the above embodiment may not include the mass flow controller  3 , while the vaporization system  100  may include at least the vaporizer  21  and the supply flow rate controller  22 . 
     In the above embodiment, the vaporization device  1  is placed such that the longitudinal direction of the vaporization device  1  faces the upper-lower direction (vertical direction). However, the vaporization device  1  may be placed on the base member F such that the longitudinal direction of the vaporization device  1  faces the left-right direction (horizontal direction). The vaporization device  1  may be fixed onto the base member F such that the inlet port P i  is positioned on an upper side of the outlet port P o . 
     The mass flow controller  3  according to the above embodiment is a so-called pressure type mass flow controller. However, the present invention is not limited to this configuration, and the mass flow controller  3  may be a so-called thermal type mass flow controller. 
     Further, the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. 
     INDUSTRIAL APPLICABILITY 
     According to the present invention, it is possible to reduce weight of a vaporization device applied to a screw with which a seal member is tightened, and to reduce non-uniformity in tightening surface pressure applied to the seal member, therefore improving sealing performance.