JP2018020793A - Plug and plug structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit failure that a gas stored in a liquid storage container increases and causes a liquid to be jetted to the outside.SOLUTION: A plug 100 includes: a plug body part 10 attached to an inner peripheral surface of an opening of a liquid storage container; and a siphon tube 20 connected with the plug body part 10. The plug body part 10 has: a first body part 10a attached to the inner peripheral surface of the opening; and a second body part 10b formed integrally with the first body part 10a and having a bottom surface part 12 disposed on a plane intersecting with an axis X1. The second body part 10b has communication parts 13 which allow communication between an internal space S1 of the liquid storage container and an internal space S2 of the plug 100 when a seal member is disposed contacting with the bottom surface part 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a plug attached to an opening of a liquid container and a plug structure including the plug.

2. Description of the Related Art Conventionally, a plug that is attached to a liquid storage container that stores a liquid such as a chemical solution used in semiconductor manufacturing is known (see, for example, Patent Document 1).
The plug disclosed in Patent Document 1 is one in which an outer plug is attached to an opening of a liquid storage container, a liquid extraction pipe is inserted into the outer plug, and an inner plug is attached to the outer plug.

Japanese Utility Model Publication No. 6-51200

  The plug disclosed in Patent Document 1 holds a pipe and prevents liquid leakage by disposing a packing between the flange portion of the outer plug and the lower end of the inner plug. Therefore, when the inner plug is attached to the outer plug, the internal space of the liquid take-out pipe and the internal space of the liquid storage container are not communicated.

  However, when the gas stored in the liquid storage container increases due to a change in the environmental temperature of the liquid storage container accompanying transportation or storage, the internal space of the liquid storage container is pressurized. In this case, when removing the inner plug from the outer plug in order to use the liquid, the liquid may be ejected to the outside through the liquid take-out pipe.

  The present invention has been made in view of such circumstances, and a plug that suppresses a problem that the gas stored in the liquid storage container increases due to a change in the environmental temperature of the liquid storage container and the liquid is ejected to the outside. It is another object of the present invention to provide a plug structure including the same.

In order to solve the above problems, the present invention employs the following means.
A plug according to an aspect of the present invention is a plug that is attached to a liquid storage container in which an opening formed in a cylindrical shape along an axis is provided on an upper surface, and is attached to an inner peripheral surface of the opening. A plug main body portion having a through hole extending along the axis at the lower end, a siphon tube connected to the lower end of the plug main body and extending to the bottom of the liquid container along the axis; The plug main body is attached to the inner peripheral surface of the opening and is formed in a cylindrical shape along the axis, and is integrally formed with the first main body and And a second body portion having a bottom surface portion disposed on a plane intersecting the axis, and the liquid storage when the second body portion is disposed in a state where a seal member is in contact with the bottom surface portion. Yong Having a communicating portion communicating the interior space and the interior space of the plug.

  According to the plug of one aspect of the present invention, the seal member is brought into contact with the bottom surface portion of the second main body portion of the plug main body portion in a state where the plug main body portion is attached to the inner peripheral surface of the opening of the liquid storage container. By doing so, the flow path formed at the lower end of the plug body is sealed. By sealing the flow path, the liquid stored in the liquid storage container is prevented from being ejected to the outside through the siphon tube.

  Moreover, according to the plug concerning 1 aspect of this invention, since the 2nd main-body part has a communication part, even when it is a case where it is arrange | positioned in the state in which the sealing member contacted the bottom face part, the internal space of a liquid storage container And the internal space of the plug communicate with each other. Therefore, even when the gas stored in the liquid storage container increases due to a change in the environmental temperature of the liquid storage container, etc., the pressure in the internal space of the liquid storage container and the pressure in the internal space of the plug are maintained at the same pressure. Is done. Thereby, when the sealing of the flow path by the seal member is released, the problem that the liquid stored in the liquid storage container is ejected to the outside through the siphon tube is suppressed.

In the plug according to one aspect of the present invention, the communication portion extends through a through hole extending along the axis, and a plane intersecting the axis, and one end communicates with the through hole and the other end of the plug. It is good also as a structure which has a communicating groove connected with internal space.
In this way, when the seal member is disposed in contact with the bottom surface of the second main body, the internal space of the liquid storage container and the internal space of the plug are connected via the through hole and the communication groove. Can communicate. Thereby, when the sealing of the flow path by the seal member is released, the problem that the liquid stored in the liquid storage container is ejected to the outside through the siphon tube is suppressed. Further, the communication portion can be formed with a relatively simple configuration in which the through hole and the communication groove intersecting the through hole are formed in the second main body portion.

In the plug having the above-described configuration, the bottom surface portion may have an endless annular protrusion extending around the axis on the outer peripheral side of the through hole with respect to the axis.
By doing so, an endless seal region is formed on the outer peripheral side of the through hole communicating with the internal space of the liquid storage container when the seal member is disposed in contact with the bottom surface of the second main body. Is done. Thereby, the malfunction that a liquid flows out outside from a siphon tube or a liquid storage container can be suppressed reliably.

In the plug according to one aspect of the present invention, the plug body portion and the siphon tube may be formed of a resin material, and the plug body portion and the siphon tube may be connected by welding of the resin material. .
By doing so, compared to the case where the plug body and the siphon tube are connected to each other through a seal member or the like without welding, the liquid or gas flows out from the connection portion between the plug body and the siphon tube. The trouble by entering can be suppressed.

A plug structure according to an aspect of the present invention includes the plug according to any one of the above, and the seal member that is attached to an inner peripheral surface of the first main body and that forms a seal region in contact with the bottom surface. And a sealing portion.
According to the plug structure according to one aspect of the present invention, the seal member is attached to the inner peripheral surface of the first main body portion of the plug, whereby the seal member and the bottom surface portion are brought into contact with each other to form a seal region. Due to this sealing region, a problem that the liquid flows out from the liquid storage container and the siphon tube is suppressed.

  Further, in the state where the seal region is formed, the internal space of the liquid storage container and the internal space of the plug are in communication with each other. Therefore, even when the gas stored in the liquid storage container increases due to a change in the environmental temperature of the liquid storage container, etc., the pressure in the internal space of the liquid storage container and the pressure in the internal space of the plug are maintained at the same pressure. Is done. Thereby, when the sealing of the flow path by the seal member is released, the problem that the liquid stored in the liquid storage container is ejected to the outside through the siphon tube is suppressed.

In the plug structure according to one aspect of the present invention, an internal thread is formed on the inner peripheral surface of the first main body portion, an external screw is formed on the outer peripheral surface of the sealing portion, and the first main body portion and The sealing portion may be connected by engaging the male screw with the female screw.
By doing in this way, the sealing part is attached to the first main body part by a relatively simple operation of attaching the male screw formed on the outer peripheral surface of the sealing part to the female screw formed on the inner peripheral surface of the first main body part. Can be attached to.

  According to the present invention, it is possible to provide a plug and a plug structure including the plug, in which the gas stored in the liquid storage container is increased due to a change in the environmental temperature of the liquid storage container and the liquid is ejected to the outside. Can do.

It is a block diagram which shows the liquid supply system of one Embodiment of this invention. It is a fragmentary longitudinal cross-section which shows the opening part of the liquid storage container to which the plug was attached. It is a longitudinal cross-sectional view of the plug shown in FIG. FIG. 3 is a plan view of the plug shown in FIG. 2 as viewed from above. FIG. 2 is a longitudinal sectional view of the sealing portion. It is a fragmentary longitudinal cross-section which shows the opening part of the liquid storage container to which the socket was attached. It is a longitudinal cross-sectional view which shows a plug and a socket. It is a longitudinal cross-sectional view which shows a plug and a socket. It is a longitudinal cross-sectional view which shows a plug and a socket. It is a fragmentary longitudinal cross-section which shows the opening part of the liquid storage container to which the plug of the modification was attached.

Hereinafter, a liquid supply system according to an embodiment of the present invention will be described with reference to the drawings.
The liquid supply system of the present embodiment shown in FIG. 1 is a system that sucks the liquid stored in the liquid storage container 400 with a pump (not shown) and supplies it to a plurality of supply destination devices (not shown).

Here, the liquid in the present embodiment is, for example, pure water or various chemicals used in the semiconductor manufacturing process of the semiconductor manufacturing apparatus.
The liquid storage container 400 may have an environmental temperature higher than that at the time when the liquid is stored therein during transportation to the factory where the semiconductor manufacturing apparatus is installed or during storage in the factory. In this case, the gas stored in the liquid storage container 400 increases due to evaporation of the internal liquid and the internal space is pressurized. Further, for example, hydrogen peroxide used as a chemical solution is decomposed into water and oxygen according to the environmental temperature and the like. Therefore, when the liquid storage container 400 is sealed, the gas region in the internal space of the liquid storage container 400 is in a state pressurized with oxygen. Further, even in a volatile chemical solution or the like, the gas region in the internal space of the liquid storage container 400 is pressurized with oxygen.

The liquid supply system of the present embodiment suppresses the liquid from being ejected from the liquid storage container 400 to the outside even when the internal space of the liquid storage container 400 is in a pressurized state.
As shown in FIG. 1, a liquid storage container 400 included in the liquid supply system of the present embodiment includes a container main body 410 formed in a cylindrical shape around an axis X2, and an axis provided on the upper surface (top plate) of the container main body 410. An opening 420 and an opening 430 formed in a cylindrical shape around X1 are provided.

As shown in FIG. 1, the liquid supply system of this embodiment includes a plug 100 and a sealing unit 200 that are attached to the opening 420 of the liquid storage container 400. In addition, the liquid supply system of this embodiment includes a sealing plug 300 that is attached to the opening 430 of the liquid storage container 400.
In the liquid supply system according to the present embodiment, when the liquid stored in the liquid storage container 400 is sucked and supplied to the supply destination device, the socket 500 is attached instead of the sealing unit 200. Further, in place of the sealing plug 300, another plug (not shown) that can supply gas to the inside of the liquid storage container 400 is attached.

Hereinafter, the plug structure of the present embodiment will be described with reference to the drawings.
As shown in FIGS. 2 and 3, the plug structure of this embodiment includes a plug 100 that is attached to the opening 420 of the liquid storage container 400 and a sealing portion 200 that is attached to the plug 100.
The plug 100 includes a plug body 10 that is attached to the inner peripheral surface of the opening 420 and a siphon tube 20 that is connected to the plug body 10 and extends to the bottom 440 (see FIG. 1) of the liquid storage container 400. A flow path 11 extending along the axis X1 is formed inside the plug main body 10 and is connected to a flow path 20a formed inside the siphon tube 20.

  The plug body 10 and the siphon tube 20 are each formed of a fluorine resin material such as PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) or a crystalline thermoplastic resin material such as HDPE (high density polyethylene). Yes. The plug main body 10 and the siphon tube 20 are welded by melting the resin material of these connecting portions with ultrasonic waves. Instead of melting the resin material by ultrasonic waves, the connecting portion between the plug main body 10 and the siphon tube 20 may be welded by melting a welding rod formed of the resin material.

  As shown in FIG. 3, the plug main body 10 has a first main body 10 a formed in a cylindrical shape along the axis X <b> 1 and a second main body having a bottom surface 12 disposed on a plane orthogonal to the axis X <b> 1. Part 10b. The first main body 10a and the second main body 10b are integrally formed of a fluorine resin material such as PFA or a crystalline thermoplastic resin material such as HDPE.

A male screw is formed on the outer peripheral surface of the first main body 10a, and a female screw is formed on the inner peripheral surface of the opening 420. The first main body 10 a is attached to the inner peripheral surface of the opening 420 by fastening the male screw of the first main body 10 a to the female screw of the opening 420.
A female screw is formed on the inner peripheral surface of the first main body portion 10a, and a male screw is formed on the outer peripheral surface of the sealing portion 200. By sealing the male screw of the sealing part 200 to the female screw of the first main body part 10a, the sealing part 200 and the first main body part 10a are connected.

  An O-ring 450 formed of fluorine rubber or the like is attached to the inner peripheral surface of the opening 420. When the 1st main-body part 10a is attached to the internal peripheral surface of the opening part 420, the O-ring 450 and the 1st main-body part 10a contact, and the seal | sticker area | region extended endlessly around the axis line X1 is formed. Thereby, the malfunction that a liquid flows out from the gap | interval of the plug main-body part 10 and the opening part 420 is suppressed.

As shown in FIG. 3, the second main body portion 10 b has a through hole 13 a formed on the outer peripheral side of the flow path 11 with respect to the axis X 1, one end communicating with the through hole 13 a, and the other end being the internal space S 2 of the plug 100. The communication part 13 which has the communication groove | channel 13b connected with the is provided.
As shown in FIG. 3, when the communication portion 13 is arranged in a state where the sealing member 220 of the sealing portion 200 is in contact with the bottom surface portion 12, the internal space S <b> 1 of the liquid storage container 400 and the internal space S <b> 2 of the plug 100. To communicate with.

As shown in FIG. 3, the through hole 13a is formed so as to extend along the axis X1. Further, as shown in the plan view of FIG. 4, the through holes 13a have a shape extending along the circumferential direction around the axis X1, and are formed at four positions with an interval of 90 degrees around the axis X1.
The communication groove 13b communicates with each of the through holes 13a formed at four locations, and is formed at four locations so as to extend in the radial direction about the axis X1 on a plane orthogonal to the axis X1.
In FIG. 3, the through holes 13a and the communication grooves 13b are formed at four places in the circumferential direction around the axis X1, but they may be formed at arbitrary places such as two places, six places, and eight places.

  As shown in FIG. 3, an endless annular protrusion 12a extending around the axis X1 is formed on the bottom surface 12 of the second main body 10b on the outer peripheral side of the through hole 13a with respect to the axis X1. As shown in FIG. 2, when the sealing member 220 of the sealing portion 200 is disposed in contact with the bottom surface portion 12, an endless shape extending around the axis line X <b> 1 at the contact portion between the annular protrusion 12 a and the sealing member 220. A seal area is formed. With this sealing region, the flow path 11 formed at the lower end of the plug body 10 is sealed.

  As shown in FIG. 5, the sealing portion 200 includes a main body portion 210 attached to the inner peripheral surface of the first main body portion 10 a and a seal member 220 that contacts the bottom surface portion 12 of the plug main body portion 10 to form a seal region. With. The seal member 220 is attached to the plug body 10 such that an annular seal surface 220a is formed below.

  The main body 210 has a protruding portion 210 a that protrudes downward from the sealing surface 220 a of the sealing member 220. The protruding portion 210 a is a portion that is inserted into the recess 14 formed in the plug main body portion 10 when the main body portion 210 of the sealing portion 200 is attached to the plug main body portion 10. By inserting the protruding portion 210 a into the recess 14, the central axis of the main body portion 210 of the sealing portion 200 can be easily aligned with the central axis of the plug main body portion 10 of the plug 100.

  Even when the protruding portion 210a of the sealing portion 200 is inserted into the recess 14 of the plug main body portion 10, a minute gap is provided between the outer peripheral surface of the protruding portion 210a and the inner peripheral surface of the recess 14. It becomes a state. Therefore, even when the sealing portion 200 is attached to the plug 100, the state in which the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon tube 20 of the plug 100 communicate with each other via the communication portion 13 is maintained. . Therefore, even when the internal space S1 of the liquid storage container 400 is pressurized due to a change in environmental temperature or the like, the pressure of the internal space S1 and the internal space S2 of the siphon tube 20 are maintained at the same pressure.

Next, the socket 500 that is attached to the opening 420 instead of the sealing unit 200 when the liquid stored in the liquid storage container 400 is sucked and supplied to the supply destination device will be described.
As shown in FIG. 6, the socket 500 is formed in a cylindrical main body 510 extending along the axis X <b> 1 and a cylindrical main body 510 extending along the axis X <b> 1 and surrounds the main socket 510. Mounting nut 520 to be arranged, O-ring 530 attached to the outer peripheral surface of socket body 510, flanges 540 and 550 fastened by fastening bolts above socket body 510, seal member 560, and lower end 570 and an O-ring 580.

A flow path 511 is formed inside the socket body 510. With the socket 500 attached to the plug 100, the flow path 511, the flow path 20a formed inside the siphon tube 20, and the socket body The supply pipe 600 attached to 510 is in communication.
The mounting nut 520 is a member in which a male screw is formed on the lower outer peripheral surface, and is a member that can move relative to the socket body 510 along the axis X1.

  By moving the mounting nut 520 relatively to the lower end of the socket main body 510, the male screw of the mounting nut 520 can be fastened to the female screw formed on the inner peripheral surface of the plug main body 10. Accordingly, as shown in FIG. 7, the socket main body 510 and the seal member 560 are attached with the mounting nut 520 and the plug main body 10 sandwiched therebetween.

The O-ring 530 restricts the mounting nut 520 from moving excessively with respect to the socket body 510 while allowing the mounting nut 520 to move relative to the socket body 510. The O-ring 530 functions as a stopper that holds the mounting nut 520 upward so that an operator can easily see the tip of the socket 500 when the socket 500 is attached to the plug 100.
The flange portions 540 and 550 are members that are fastened to the socket main body 510 by fastening bolts. The flange portions 540 and 550 define an upper limit position where the mounting nut 520 can move relative to the socket main body 510.

As shown in FIG. 7, the seal member 560 is attached to the socket main body 510 so that an annular seal surface 560a is formed below.
A lower end 570 that protrudes downward from the seal surface 560 a of the seal member 560 is attached to the lower end of the socket body 510. The lower end 570 is a portion that is inserted into the recess 14 formed in the plug body 10 when the socket body 510 is attached to the plug body 10. By inserting the lower end 570 into the recess 14, the central axis of the socket main body 510 can be easily aligned with the central axis of the plug main body 10 of the plug 100.

  As shown in FIG. 7, when the lower end 570 is inserted into the recess 14 of the plug main body 10, the O-ring 580 attached to the outer peripheral surface of the socket main body 510 comes into contact with the inner peripheral surface of the recess 14. An endless seal region extending around the axis X1 is formed. Therefore, when the socket 500 is attached to the plug 100, the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon tube 20 of the plug 100 are maintained in a state of not communicating with each other. Therefore, when the internal space S2 of the siphon tube 20 is sucked by a pump (not shown), the pressure difference generated between the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon tube 20 of the plug 100 is maintained. The

Next, an operation for removing the socket 500 from the plug 100 will be described with reference to FIGS.
When the fastening between the mounting nut 520 and the plug body 10 is gradually loosened from the state shown in FIG. 7, the state shown in FIG. 8 is obtained. In the state shown in FIG. 8, since the O-ring 580 is in contact with the inner peripheral surface of the recess 14, it is generated between the internal space S <b> 1 of the liquid storage container 400 and the internal space S <b> 2 of the siphon tube 20 of the plug 100. The pressure difference is maintained. In this state, the liquid inside the siphon tube 20 may rise to the recess 14 of the plug 100 due to the pressure difference between the internal space S1 and the internal space S2.

  If the fastening between the mounting nut 520 and the plug body 10 is further loosened from the state shown in FIG. 8, the state shown in FIG. 9 is obtained. In the state shown in FIG. 9, since the O-ring 580 is not in contact with the inner peripheral surface of the recess 14, there is no pressure between the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon tube 20 of the plug 100. There will be no difference. In this state, since there is no pressure difference between the internal space S1 and the internal space S2, the liquid inside the siphon tube 20 does not rise to the recess 14 of the plug 100. In this state, the liquid level in the internal space S1 is the same as the liquid level in the internal space S2.

  In addition, according to the plug 100 of this embodiment, since the communication groove 13b is further formed in addition to the through hole 13a, the O-ring 580 is formed in the recess 14 compared to the case where the communication groove 13b is not formed. A state of not contacting the inner peripheral surface is realized at an early stage. Therefore, compared with the case where the communication groove 13b is not formed, it is possible to suppress the problem that the liquid inside the siphon tube 20 rises up to the recess 14 of the plug 100 and is ejected.

The operation and effect of the plug 100 and the plug structure of the present embodiment described above will be described.
According to the plug 100 of the present embodiment, the plug main body 10 is attached to the bottom surface 12 of the second main body 10b of the plug main body 10 in a state where the plug main body 10 is attached to the inner peripheral surface of the opening 420 of the liquid storage container 400. By bringing the seal member 220 into contact, the flow path 11 formed at the lower end of the plug body 10 is sealed. By sealing the flow path 11, the liquid stored in the liquid storage container 400 is prevented from being ejected to the outside through the siphon tube 20.

Moreover, according to the plug 100 of this embodiment, since the 2nd main-body part 10b has the communication part 13, even if it is a case where the sealing member 220 is arrange | positioned in the state which contacted the bottom face part 12, the liquid storage container 400. The internal space S1 and the internal space S2 of the siphon tube 20 of the plug 100 communicate with each other.
Therefore, even when the gas stored in the liquid storage container 400 increases due to a change in the environmental temperature of the liquid storage container 400, the pressure of the internal space S1 of the liquid storage container 400 and the pressure of the internal space S2 of the plug 100 are increased. Are maintained at the same pressure. Thereby, when the sealing of the flow path by the seal member 220 is released, the problem that the liquid stored in the liquid storage container 400 is ejected to the outside through the siphon tube 20 is suppressed.

In the plug 100 of the present embodiment, the communication portion 13 extends on a through hole 13a extending along the axis X1 and a plane intersecting the axis X1, and one end communicates with the through hole 13a and the other end is inside the plug 100. A communication groove 13b communicating with the space S2.
By doing so, when the seal member 220 is arranged in contact with the bottom surface portion 12 of the second main body portion 10b, the internal space S1 of the liquid storage container 400 via the through hole 13a and the communication groove 13b. And the internal space S2 of the plug 100 can be communicated with each other. Thereby, when the sealing of the flow path 11 by the seal member 220 is released, the problem that the liquid stored in the liquid storage container 400 is ejected to the outside through the siphon tube 20 is suppressed. Moreover, the communication part 13 can be formed by the comparatively simple structure of forming the through-hole 13a and the communication groove 13b orthogonal to it in the 2nd main-body part 10b.

In the plug 100 of the present embodiment, the bottom surface portion 12 has an endless annular protrusion 12a extending around the axis X1 on the outer peripheral side with respect to the axis X1 than the through hole 13a.
In this way, when the seal member 220 is arranged in contact with the bottom surface portion 12 of the second main body portion 10b, the endless end is formed on the outer peripheral side of the through hole 13a communicating with the internal space S1 of the liquid storage container 400. A shaped seal region is formed. Thereby, the malfunction that a liquid flows out outside from the siphon pipe | tube 20 or the liquid storage container 400 can be suppressed reliably.

In the plug 100 of the present embodiment, the plug body 10 and the siphon tube 20 are formed of a resin material, and the plug body 10 and the siphon tube 20 are connected by welding of the resin material.
By doing in this way, compared with the case where it connects as a separate member via a sealing member etc., without welding the plug main-body part 10 and the siphon pipe | tube 20, it is liquid from the connection part of the plug main-body part 10 and the siphon pipe | tube 20. And problems due to the inflow and outflow of gas can be suppressed.

The plug structure of the present embodiment includes a plug 100 and a sealing portion 200 that is attached to the inner peripheral surface of the first main body portion 10a and has a seal member 220 that contacts the bottom surface portion 12 to form a seal region. .
According to the plug structure of the present embodiment, by attaching the sealing portion 200 to the inner peripheral surface of the first main body portion 10a of the plug 100, the seal member 220 and the bottom surface portion 12 come into contact with each other to form a seal region. . By this seal region, a problem that the liquid flows out from the liquid storage container 400 and the siphon tube 20 to the outside is suppressed.

  In the state where the seal region is formed, the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon tube 20 of the plug 100 communicate with each other. Therefore, even if the gas stored in the liquid storage container 400 increases due to a change in the environmental temperature of the liquid storage container 400 or the like, the pressure in the internal space S1 of the liquid storage container 400 and the inside of the siphon tube 20 of the plug 100 are increased. The pressure in the space S2 is maintained at the same pressure. Thereby, when the sealing of the flow path 11 by the seal member 220 is released, the problem that the liquid stored in the liquid storage container 400 is ejected to the outside through the siphon tube 20 is suppressed.

In the plug structure of the present embodiment, a female screw is formed on the inner peripheral surface of the first main body portion 10a, and a male screw is formed on the outer peripheral surface of the sealing portion 200. The first main body portion 10a and the sealing portion 200 is connected by engaging a male screw with a female screw.
By doing in this way, the sealing part 200 is attached to the sealing part 200 by a relatively simple operation of attaching the male screw formed on the outer peripheral surface of the sealing part 200 to the female screw formed on the inner peripheral surface of the first main body part 10a. 1 It can attach to the main-body part 10a.

<Other embodiments>
In the above description, the plug main body 10 and the siphon tube 20 are welded by melting the resin material by ultrasonic waves or welded by melting the welding rod. Good.
For example, as shown in FIG. 10, the lower end of the plug main body 10A may be formed in a cylindrical shape, and the lower end A of the plug main body 10 may be inserted into the upper end of the siphon tube 20A.

  As shown in FIG. 10, the lower end of the plug body 10A according to another aspect (modified example) is formed in a cylindrical shape extending along the axis X1, and an endless annular protrusion 15 is provided on the outer peripheral surface. ing. As shown in FIG. 10, the outer peripheral surface of the lower end of the plug body 10A is in contact with the inner peripheral surface of the upper end of the siphon tube 20A. In this state, an endless seal region extending around the axis X1 is formed between the annular protrusion 15 and the inner peripheral surface of the upper end of the siphon tube 20A. Since this seal region is formed, in this aspect, the plug main body 10A and the siphon tube 20 can be connected without performing operations such as welding and welding.

10, 10A Plug main body portion 10a First main body portion 10b Second main body portion 11 Channel 12 Bottom surface portion 12a Annular protrusion 13 Communication portion 14 Recess 15 Annular protrusion 20, 20A Siphon tube 100 Plug 200 Sealing portion 210 Main portion 210a Protruding part 220 Sealing member 220a Sealing surface 300 Sealing plug 400 Liquid storage container 410 Container body 420, 430 Opening part 440 Bottom 450 O-ring 500 Socket 510 Socket body part 520 Mounting nut 530 O-ring 540, 550 Flange part 560 Sealing member 570 Lower end 580 O-ring 600 Supply piping S1, S2 Internal space X1, X2 Axis

Claims (6)

A plug attached to a liquid storage container provided with an opening formed in a cylindrical shape along an axis on an upper surface,
A plug main body portion formed with a flow path attached to the inner peripheral surface of the opening and extending along the axis;
A siphon tube connected to the plug body and extending to the bottom of the liquid container along the axis,
The plug body is
A first body part attached to the inner peripheral surface of the opening and formed in a cylindrical shape along the axis;
A second body portion formed integrally with the first body portion and having a bottom surface portion disposed on a plane intersecting the axis;
A plug having a communication portion that communicates the internal space of the liquid storage container and the internal space of the plug when the second main body portion is disposed in a state where a seal member is in contact with the bottom surface portion. The communication part is
A through hole extending along the axis;
The plug according to claim 1, further comprising: a communication groove extending on a plane intersecting the axis and having one end communicating with the through hole and the other end communicating with the internal space of the plug.   The plug according to claim 2, wherein the bottom surface portion has an endless annular protrusion that extends around the axis on the outer peripheral side of the through-hole with respect to the axis. The plug body and the siphon tube are formed of a resin material;
The plug according to any one of claims 1 to 3, wherein the plug main body portion and the siphon tube are connected by welding of the resin material. The plug according to any one of claims 1 to 4,
A plug structure comprising: a sealing portion that is attached to the inner peripheral surface of the first main body portion and has the sealing member that forms a sealing region in contact with the bottom surface portion. An internal thread is formed on the inner peripheral surface of the first main body,
A male screw is formed on the outer peripheral surface of the sealing portion,
The plug structure according to claim 5, wherein the first main body portion and the sealing portion are coupled by fastening the male screw to the female screw.

Images