TWI732899B - Plug and plug structure - Google Patents

Abstract

Provided is a plug 100 which includes a plug main body 10 attached to the inner peripheral surface of an opening of a liquid storage container, and a siphon pipe 20 connected to the plug main body 10, the plug main body 10 including a first main body 10a attached to the inner peripheral surface of the opening, and a second main body 10b integrally formed with the first main body 10a and having a bottom portion 12 arranged on a plane intersecting an axis X1, the second main body 10b having a communicating portion 13 for communicating an internal space S1 of the 1iquid storage container with an internal space S2 of the plug 100 when a sealing member is arranged in contact with the bottom portion 12.

Description

Embolism and embolism structure

The present invention relates to a plug installed in the opening of a liquid storage container and a plug structure provided with the plug.

Conventionally, there has been known a plug that is attached to a liquid storage container that contains a liquid such as a chemical solution used in semiconductor manufacturing (for example, refer to Patent Document 1).

In the plug disclosed in Patent Document 1, an outer plug is attached to the opening of a liquid storage container, a liquid extraction tube is inserted into the outer plug, and an inner plug is attached to the outer plug.

(Prior technical literature) (Patent Document)

Patent Document 1: Japanese Publication No. 6-51200

In the plug disclosed in Patent Document 1, a gasket is arranged between the rim portion of the outer plug and the lower end of the inner plug to hold the retaining tube and prevent liquid leakage. Therefore, when the inner plug is installed on the outer plug, It will become a state where the internal space of the liquid extraction tube and the internal space of the liquid storage container are not connected.

However, when the gas contained in the liquid storage container increases due to changes in the ambient temperature of the liquid storage container to be transported or stored, the internal space of the liquid storage container is pressurized. At this time, when the inner plug is removed from the outer plug in order to use the liquid, the liquid may be ejected to the outside through the liquid extraction tube.

The present invention was developed in view of the above circumstances, and its purpose is to provide a plug and a plug structure provided with the plug, which suppresses the increase of the gas contained in the liquid storage container due to changes in the ambient temperature of the liquid storage container, and the liquid Absence of external ejection.

In order to solve the above-mentioned problems, the present invention adopts the following means.

In one aspect of the present invention, a plug is attached to a plug of a liquid storage container. The upper surface of the liquid storage container is provided with an opening formed in a cylindrical shape along an axis. The inner peripheral surface of the opening, and the lower end is formed with a through hole extending along the aforementioned axis; and a siphon tube connected to the aforementioned lower end of the plug body and extending along the aforementioned axis to the bottom of the liquid container The plug body portion is provided with: a first body portion, which is mounted on the inner peripheral surface of the opening portion, and is formed in a cylindrical shape along the axis; and a second body portion, which is integrated with the first body portion Is formed on the ground and has a bottom surface disposed on a plane intersecting the aforementioned axis; the aforementioned second book The body part has a communication part that communicates the internal space of the liquid storage container with the internal space of the plug when the sealing member is arranged in a state in which the sealing member is in contact with the bottom surface.

According to one aspect of the plug of the present invention, the sealing member is brought into contact with the bottom surface of the second main body part of the plug main body in a state where the main body of the plug is mounted on the inner peripheral surface of the opening of the liquid container , So as to seal the flow path formed at the lower end of the plug body. By sealing the flow path, the liquid contained in the liquid container is prevented from being ejected to the outside through the siphon.

Furthermore, according to one aspect of the plug of the present invention, since the second body portion has the communicating portion, even when the sealing member is arranged in a state where the sealing member is in contact with the bottom surface, it will become the internal space of the liquid container and the inside of the plug The state of spatial connectivity. Therefore, even if the gas contained in the liquid storage container increases due to changes in the ambient temperature of the liquid storage container, etc., the pressure of the internal space of the liquid storage container and the pressure of the internal space of the plug are maintained at the same pressure. This prevents the liquid contained in the liquid storage container from being ejected to the outside through the siphon tube when the sealing of the flow path by the sealing member is released.

In the plug according to one aspect of the present invention, the communication portion may be configured to have: a through hole extending along the axis; and extending on a plane intersecting the axis, and one end of which is in communication with the through hole, and A communicating groove with one end communicating with the internal space of the aforementioned plug.

With this configuration, when the sealing member is arranged in a state where the sealing member is in contact with the bottom surface of the second body portion, the liquid can be accommodated through the through hole and the communicating groove. The internal space of the device is connected with the internal space of the plug. This prevents the liquid contained in the liquid container from being ejected to the outside through the siphon tube when the flow path is sealed by the sealing member. In addition, the communication portion can be formed by a relatively simple structure in which a through hole and a communication groove intersecting the through hole are formed in the second body portion.

In the plug having the above configuration, the bottom surface portion may have an endless ring-shaped protrusion extending around the axis line on the outer peripheral side of the through hole with respect to the axis line.

With the above configuration, when the sealing member is arranged in a state in which it is in contact with the bottom surface of the second body portion, an endless sealing area is formed on the outer peripheral side of the through hole communicating with the internal space of the liquid container. Thereby, it is possible to reliably prevent the liquid from flowing out from the siphon tube or the liquid container to the outside.

In one aspect of the plug of the present invention, the plug body and the siphon tube are formed of a resin material, and the plug body and the siphon tube may also be connected by welding the resin material.

With the above structure, it is possible to prevent liquid or gas from flowing and flowing from the connecting part of the plug body and the siphon when it is connected as a separate member without welding the plug body and the siphon through a sealing member, etc. The lack of it.

One aspect of the plug structure of the present invention includes: the plug described in any one of the above; and a sealing member that is mounted on the inner peripheral surface of the first body portion and contacts the bottom surface to form a sealing area Sealing department.

According to the plug structure of one aspect of the present invention, by installing the sealing portion On the inner peripheral surface of the first body portion of the plug, the sealing member contacts the bottom surface to form a sealing area. With this sealed area, the lack of liquid outflow from the liquid storage container and the siphon tube to the outside is suppressed.

Furthermore, in the state where the sealed area is formed, the internal space of the liquid container and the internal space of the plug are connected. Therefore, even if the gas contained in the liquid storage container increases due to changes in the ambient temperature of the liquid storage container, etc., the pressure of the internal space of the liquid storage container and the pressure of the internal space of the plug are maintained at the same pressure. Thereby, when the sealing of the flow path by the sealing member is released, the liquid contained in the liquid container is ejected to the outside through the siphon tube.

In the plug structure of one aspect of the present invention, a female thread is formed on the inner peripheral surface of the first body portion, and a male thread is formed on the outer peripheral surface of the sealing portion, and the first body portion and the sealing portion may be It is connected by engaging the male thread with the female thread.

With the above configuration, the sealing portion can be mounted on the first body portion by a relatively simple operation of forming the male thread formed on the outer peripheral surface of the sealing portion on the female thread on the inner peripheral surface of the first body portion.

According to the present invention, it is possible to provide a plug and a plug structure provided with the plug. The plug suppresses the increase of the gas contained in the liquid storage container due to changes in the ambient temperature of the liquid storage container and the lack of liquid ejection to the outside.

10、10A‧‧‧Embolic body part

10a‧‧‧First body part

10b‧‧‧Second body part

11‧‧‧Flow Path

12‧‧‧Bottom face

12a‧‧‧Annular protrusion

13‧‧‧Connecting Department

13a‧‧‧Through hole

13b‧‧‧Connecting groove

14‧‧‧Concave

20, 20A‧‧‧Siphon

20a, 511‧‧‧flow path

100‧‧‧Embolic

200‧‧‧Sealing Department

210‧‧‧Main body

210a‧‧‧Protrusion

220、560‧‧‧Sealing components

220a‧‧‧Sealing surface

300‧‧‧Sealing plug

400‧‧‧Liquid storage container

410‧‧‧Container body

450, 530, 580‧‧‧O ring

500‧‧‧Socket

510‧‧‧Socket body

520‧‧‧Installation nut

540, 550‧‧‧Rim

570‧‧‧Lower end

S1, S2‧‧‧Internal space

X1, X2‧‧‧Axis

Fig. 1 is a configuration diagram showing a liquid supply system according to an embodiment of the present invention.

Figure 2 is a partial longitudinal cross-sectional view showing the opening of the liquid container with the plug installed.

Figure 3 is a longitudinal cross-sectional view of the plug shown in Figure 2.

Figure 4 is a plan view of the plug shown in Figure 2 when viewed from above.

Fig. 5 is a longitudinal cross-sectional view of the sealing portion of Fig. 2.

Fig. 6 is a partial longitudinal sectional view showing the opening of the liquid storage container with the socket installed.

Figure 7 is a longitudinal sectional view showing the plug and socket.

Figure 8 is a longitudinal sectional view showing the plug and socket.

Figure 9 is a longitudinal sectional view showing the plug and socket.

Fig. 10 is a partial longitudinal cross-sectional view showing the opening of the liquid storage container to which the plug of the modified example is 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 this embodiment shown in FIG. 1 is a system that sucks the liquid contained in the liquid storage container 400 by a pump (not shown) and supplies it to a plurality of supply target devices (not shown).

Here, the liquid system of the present embodiment refers to, for example, pure water or various chemical solutions used in the semiconductor manufacturing step of a semiconductor manufacturing device.

When the liquid storage container 400 is transported to a factory equipped with semiconductor manufacturing equipment or stored in the factory, the ambient temperature will be higher than that of the liquid storage container. Possibility at an internal point in time. At this time, the gas contained in the liquid storage container 400 increases due to the evaporation of the liquid inside, and pressurizes the internal space. Furthermore, for example, hydrogen peroxide water used as a chemical solution is decomposed into water and oxygen depending on the ambient temperature and the like. Therefore, when the liquid storage container 400 is sealed, the gas area in the internal space of the liquid storage container 400 is pressurized by oxygen. Furthermore, even in a volatile liquid medicine or the like, the gas area in the inner space of the liquid storage container 400 will be in a state where the gas area is pressurized by oxygen.

In the liquid supply system of this embodiment, even when the internal space of the liquid storage container 400 is pressurized, it is suppressed to prevent the liquid from being ejected from the liquid storage container 400 to the outside.

As shown in Figure 1, the liquid storage container 400 included in the liquid supply system of this embodiment includes: a container body 410 formed in a cylindrical shape around an axis X2; and is provided on the upper surface (top plate) of the container body 410 , And are formed into a cylindrical opening 420 and an opening 430 around the axis X1.

As shown in FIG. 1, the liquid supply system of this embodiment includes a plug 100 and a sealing portion 200 attached to the opening 420 of the liquid storage container 400. Furthermore, the liquid supply system of this embodiment includes a sealing plug 300 attached to the opening 430 of the liquid storage container 400.

In the liquid supply system of this embodiment, when the liquid contained in the liquid storage container 400 is sucked and supplied to the supply target device, the socket 500 is installed instead of the sealing portion 200. Furthermore, instead of the sealing plug 300, another device that can supply gas to the inside of the liquid storage container 400 is installed. He bolted (illustration omitted).

Hereinafter, the embolization structure of this 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 attached to the opening 420 of the liquid storage container 400; and a sealing portion 200 attached to the plug 100.

The plug 100 includes a plug main body 10 attached to the inner peripheral surface of the opening 420, and a siphon tube 20 connected to the plug main body 10 and extending to the bottom 440 (refer to FIG. 1) of the liquid storage container 400. Inside the plug body 10, a flow path 11 extending along the axis X1 is formed, and is connected to a flow path 20a formed inside the siphon 20.

The plug body 10 and the siphon 20 are respectively formed of a fluororesin material such as PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) or a crystalline thermoplastic resin material such as HDPE (high density polyethylene). The plug body 10 and the siphon 20 are welded by ultrasonically melting the resin material of the connecting parts. In addition, instead of melting the resin material by ultrasonic waves, the welding rod that forms the connecting portion of the plug body portion 10 and the siphon 20 by a resin material can be melted and welded.

As shown in Fig. 3, the plug body portion 10 has: a first body portion 10a formed in a cylindrical shape along the axis X1; and a second body portion 12 having a bottom surface 12 arranged on a plane orthogonal to the axis X1 The main body 10b. The first body portion 10a and the second body portion 10b are integrally formed of a fluororesin 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 body portion 10 a, and a female screw is formed on the inner peripheral surface of the opening 420. By fastening the male thread of the first body portion 10 a to the female thread of the opening portion 420, the first body portion 10 a is installed on the inner peripheral surface of the opening portion 420.

A female screw is formed on the inner peripheral surface of the first body portion 10 a, and a male screw is formed on the outer peripheral surface of the sealing portion 200. The male thread of the sealing part 200 is fastened to the female thread of the first body part 10a to connect the sealing part 200 and the first body part 10a.

On the inner peripheral surface of the opening 420, an O ring 450 formed of fluororubber or the like is attached. When the first body portion 10a is installed on the inner peripheral surface of the opening portion 420, the O-ring 450 is in contact with the first body portion 10a, and an endless sealing area is formed around the axis X1. This prevents the liquid from flowing out of the gap between the plug body portion 10 and the opening portion 420 to the outside.

As shown in Fig. 3, the second body portion 10b is provided with a communicating portion 13 having a through hole 13a formed on the outer peripheral side of the flow path 11 with respect to the axis X1; and one end of which communicates with the through hole 13a. The communication groove 13b communicates with the internal space S2 of the plug 100 at the other end.

As shown in Fig. 3, the communicating portion 13 is arranged in a state in which the sealing member 220 of the sealing portion 200 is in contact with the bottom surface 12, so that the internal space S1 of the liquid storage container 400 communicates with the internal space S2 of the plug 100 .

As shown in Fig. 3, the through hole 13a is formed to extend along the axis X1. Furthermore, as shown in the top view of FIG. 4, the through hole 13a has a shape extending along the circumferential direction around the axis X1, and is around the axis X is formed at four locations at intervals of 90 degrees.

The communication grooves 13b communicate with each of the through holes 13a formed in the four places, and are formed in four places so as to extend in the radial direction with the axis X1 as the center on a plane orthogonal to the axis X1.

In addition, Fig. 3 shows that the through holes 13a and the communicating grooves 13b are formed at four locations around the circumferential direction of the axis X1, but they may be formed at any locations such as two locations, six locations, and eight locations.

As shown in FIG. 3, on the bottom surface 12 of the second body portion 10b, an endless ring-shaped protrusion 12a extending around the axis X1 is formed on the outer peripheral side with respect to the axis X1 than the through hole 13a. As shown in Figure 2, when the sealing member 220 of the sealing portion 200 is arranged in contact with the bottom surface 12, the contact portion between the annular protrusion 12a and the sealing member 220 is formed with an endless shape extending around the axis X1 Seal the area. With this sealing area, 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 body portion 210 mounted on the inner peripheral surface of the first body portion 10a, and a sealing member 220 that contacts the bottom surface 12 of the plug body portion 10 to form a sealing area. The sealing member 220 is attached to the plug main body 10 in such a manner that an annular sealing surface 220a is formed below.

The main body 210 has a protrusion 210a protruding downward from the sealing surface 220a of the sealing member 220. The protruding portion 210 a is inserted into the recessed portion 14 formed in the plug main body portion 10 when the main body portion 210 of the sealing portion 200 is mounted on the plug main body portion 10. By placing the protrusion 210a By inserting into the recess 14, the central axis of the main body 210 of the sealing part 200 can be easily aligned with the central axis of the plug main body 10 of the plug 100.

In addition, even if the protruding portion 210a of the sealing portion 200 is inserted into the recessed portion 14 of the plug body portion 10, there will be a state where a small gap is provided between the outer peripheral surface of the protruding portion 210a and the inner peripheral surface of the recessed portion 14. Therefore, even when the sealing portion 200 is installed on the plug 100, the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon 20 of the plug 100 are maintained in a communicating state through the communicating portion 13. Therefore, even when the internal space S1 of the liquid storage container 400 is pressurized due to changes in ambient temperature or the like, the pressure of the internal space S1 and the internal space S2 of the siphon 20 are maintained at the same pressure.

Next, when sucking the liquid stored in the liquid storage container 400 and supplying it to the supply target device, the socket 500 is not installed in the sealing part 200 but installed in the opening 420.

As shown in FIG. 6, the socket 500 is provided with: a socket body portion 510 formed in a cylindrical shape extending along the axis X1; and a cylindrical shape extending along the axis X1 to surround the socket body portion 510 The mounting nut 520; the O-ring 530 installed on the outer peripheral surface of the socket body part 510; the rim parts 540, 550 which are fastened above the socket body part 510 by fastening bolts; the sealing member 560; The lower end 570; and the O ring 580.

A flow path 511 is formed inside the socket body part 510. When the socket 500 is installed in the plug 100, the flow path 511 is formed, the flow path 20a formed inside the siphon 20, and the supply pipe installed in the socket body part 510 600 connected state.

The mounting nut 520 is a member having a male screw formed on the outer peripheral surface of the lower part, and is a member that moves relative to the socket body portion 510 along the axis X1.

By relatively moving the mounting nut 520 to the lower end of the socket body portion 510, the male thread of the mounting nut 520 can be fastened to the female thread formed on the inner peripheral surface of the plug body portion 10. As a result, as shown in FIG. 7, between the mounting nut 520 and the plug body 10, it is installed in a state sandwiched between the socket body 510 and the sealing member 560.

The O-ring 530 allows the mounting nut 520 to move relatively relative to the socket body 510, and at the same time restricts the mounting nut 520 from excessively moving relative to the socket body 510. The O ring 530 functions as a stopper for fixing the mounting nut 520 on the upper side so that the operator can easily recognize the front end of the socket 500 when the socket 500 is installed on the plug 100.

The rim parts 540 and 550 are members that are fastened to the socket body part 510 by fastening bolts, respectively. The rim portions 540 and 550 are used to set the upper limit position at which the mounting nut 520 can move relative to the socket body portion 510.

As shown in FIG. 7, the sealing member 560 is attached to the socket main body 510 so that an annular sealing surface 560a is formed below.

At the lower end of the socket body 510, a lower end 570 protruding downward from the sealing surface 560a of the sealing member 560 is installed. The lower end portion 570 is inserted into the recessed portion 14 formed in the plug main body portion 10 when the socket main body portion 510 is mounted on the plug main body portion 10. By inserting the lower end portion 570 into the recess 14, the central axis of the socket body portion 510 can be easily aligned with the central axis of the plug body portion 10 of the plug 100.

As shown in Figure 7, when the lower end 570 is inserted into the recess 14 of the plug body 10, the O-ring 580 installed on the outer peripheral surface of the socket body 510 will contact the inner peripheral surface of the recess 14 to form an axis around the axis. X1 extends endless sealing area. Therefore, when the socket 500 is installed on the plug 100, the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon 20 of the plug 100 are maintained in a disconnected state. 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.

Next, referring to FIGS. 8 and 9, the operation of removing the socket 500 from the plug 100 will be described.

When the fastening between the mounting nut 520 and the plug body 10 is gradually loosened from the state shown in FIG. 7, it will be in the state shown in FIG. 8. In the state shown in Figure 8, since the O-ring 580 is in contact with the inner peripheral surface of the recess 14, the pressure generated between the internal space S1 of the liquid container 400 and the internal space S2 of the siphon 20 of the plug 100 is maintained Difference. In this state, there is a possibility that the liquid inside the siphon tube 20 will rise to the recess 14 of the plug 100 due to the pressure difference between the internal space S1 and the internal space S2.

When the fastening between the mounting nut 520 and the plug body 10 is gradually loosened from the state shown in FIG. 8, it will be in the state shown in FIG. 9. In the state shown in Fig. 9, since the O-ring 580 does not contact the inner peripheral surface of the recess 14, there is no gap between the internal space S1 of the liquid container 400 and the internal space S2 of the siphon 20 of the plug 100. The state of producing a pressure difference. In this state, since there will be no internal space S1 and internal The pressure difference in the space S2 prevents the liquid inside the siphon tube 20 from rising to the recess 14 of the plug 100. In this state, the height of the liquid surface in the internal space S1 is the same as the height of the liquid surface in the internal space S2.

In addition, according to the plug 100 of this embodiment, in addition to the through hole 13a, the communicating groove 13b is formed. Compared with the case where the communicating groove 13b is not formed, the O-ring 580 is not in contact with the inner peripheral surface of the recess 14 The state will be realized early. Therefore, compared with the case where the communication groove 13b is not formed, the liquid in the siphon tube 20 can be prevented from rising to the recessed portion 14 of the plug 100 and being ejected.

The above-described functions and effects of the plug 100 and the plug structure of the present embodiment are described.

According to the plug 100 of this embodiment, with the plug main body 10 attached to the inner peripheral surface of the opening 420 of the liquid storage container 400, the sealing member 220 is brought into contact with the second main body portion of the plug main body 10 The bottom surface 12 of 10b seals the flow path 11 formed at the lower end of the plug body 10. By sealing the flow path 11, the liquid contained in the liquid storage container 400 is prevented from being ejected to the outside through the siphon 20.

Furthermore, according to the plug 100 of this embodiment, since the second body portion 10b has the communicating portion 13, even when the sealing member 220 is arranged in a state where the sealing member 220 is in contact with the bottom portion 12, it becomes the internal space S1 of the liquid storage container 400 and The internal space S2 of the siphon 20 of the plug 100 is connected.

Therefore, even if the gas contained in the liquid storage container 400 is trapped by the liquid, When the ambient temperature of the container 400 changes and increases, 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 will be maintained at the same pressure. This prevents the liquid contained in the liquid storage container 400 from being ejected to the outside through the siphon tube 20 when the sealing member 220 performs the sealing of the flow path.

In the plug 100 of this embodiment, the communicating portion 13 is provided with a through hole 13a extending along the axis X1; extending on a plane intersecting the axis X1, and one end of which communicates with the through hole 13a, and the other end of the plug 100 The communication groove 13b through which the internal space S2 communicates.

With the above method, when the sealing member 220 is arranged in a state in which the sealing member 220 is in contact with the bottom surface 12 of the second body portion 10b, the internal space S1 of the liquid storage container 400 and the inside of the plug 100 can be made through the through hole 13a and the communication groove 13b. The space S2 is connected. This prevents the liquid contained in the liquid storage container 400 from being ejected to the outside through the siphon tube 20 when the sealing member 220 performs the sealing of the flow path 11. Furthermore, by forming the through hole 13a and the communicating groove 13b orthogonal to the through hole 13a in the second main body portion 10b with a relatively simple structure, the communicating portion 13 can be formed.

Furthermore, the bottom surface 12 of the plug 100 of the present embodiment has an endless annular protrusion 12a extending around the axis X1 on the outer peripheral side relative to the axis X1 than the through hole 13a.

With the above method, when the sealing member 220 is arranged in a state in which the sealing member 220 is in contact with the bottom surface 12 of the second body portion 10b, an endless seal is formed on the outer peripheral side of the through hole 13a communicating with the internal space S1 of the liquid storage container 400 area. This prevents liquid from flowing from the siphon 20 or the liquid storage container 400 The lack of outflow.

In the plug 100 of this embodiment, the plug body 10 and the siphon 20 are formed of a resin material, and the plug body 10 and the siphon 20 are connected by welding the resin material.

With the above method, the plug body 10 and the siphon tube 20 are not welded, compared with the case where the plug body 10 and the siphon tube 20 are connected as a separate member through a sealing member or the like, and liquid or gas can be suppressed from the plug body 10 and the siphon tube 20. The connection part of the outflow and inflow is missing.

The plug structure of this embodiment includes a plug 100 and a sealing portion 200 having a sealing member 220. The sealing member 22 is attached to the inner peripheral surface of the first body portion 10a and contacts the bottom surface 12 to form a sealed area.

According to the plug structure of this embodiment, by mounting the sealing portion 200 on the inner peripheral surface of the first body portion 10a of the plug 100, the sealing member 220 is in contact with the bottom portion 12 to form a sealing area. This sealed area suppresses the loss of liquid from flowing out of the liquid storage container 400 and the siphon 20 to the outside.

Furthermore, in the state where the sealed area is formed, the internal space S1 of the liquid storage container 400 and the internal space S2 of the siphon 20 of the plug 100 are connected. Therefore, even when the gas contained in the liquid storage container 400 increases due to changes in the ambient temperature of the liquid storage container 400, the pressure in the internal space S1 of the liquid storage container 400 and the pressure in the internal space S2 of the siphon 20 of the plug 100 are maintained At the same pressure. This prevents the liquid contained in the liquid container 400 from being ejected to the outside through the siphon tube 20 when the sealing of the flow path 11 by the sealing member 220 is released. The missing.

In the plug structure of this embodiment, a female thread is formed on the inner peripheral surface of the first body portion 10a, and a male thread is formed on the outer peripheral surface of the sealing portion 200. The thread is engaged with the female thread and connected.

With the above method, the sealing portion 200 can be mounted on the first body portion 10a by a relatively simple operation of mounting the male thread formed on the outer peripheral surface of the sealing portion 200 to the female thread formed on the inner peripheral surface of the first body portion 10a. A body part 10a.

<Other embodiments>

In the above description, the plug body portion 10 and the siphon 20 are welded by ultrasonic melting of the resin material, or welded by the melting of a welding rod, but other aspects are also possible.

For example, as shown in FIG. 10, although the lower end of the plug main body 10A is formed into a cylindrical shape, the lower end of the plug main body 10A may be inserted into the upper end of the siphon 20A.

As shown in FIG. 10, the lower end of the plug body portion 10A of 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. As shown in Fig. 10, the outer peripheral surface of the lower end of the plug main body 10A is in contact with the inner peripheral surface of the upper end of the siphon tube 20A. In this state, between the annular protrusion 15 and the inner peripheral surface of the upper end of the siphon tube 20A, an endless sealing area extending around the axis X1 is formed. In order to form the sealed area, in this state In this way, the plug main body 10A and the siphon 20 can be connected without performing welding or welding operations.

10‧‧‧Embolic body

10a‧‧‧First body part

10b‧‧‧Second body part

11‧‧‧Flow Path

12‧‧‧Bottom face

12a‧‧‧Annular protrusion

13‧‧‧Connecting Department

13a‧‧‧Through hole

13b‧‧‧Connecting groove

14‧‧‧Concave

20‧‧‧Siphon

100‧‧‧Embolic

S1, S2‧‧‧Internal space

X1‧‧‧Axis

Claims (5)

A plug is a plug installed on a liquid storage container, the upper surface of the liquid storage container is provided with an opening formed in a cylindrical shape along an axis, and the plug is provided with a plug body, which is mounted on the opening The inner peripheral surface is formed with a flow path extending along the aforementioned axis; and a siphon tube is connected to the aforementioned plug body portion and extends along the aforementioned axis to the bottom of the aforementioned liquid storage container; the aforementioned plug body portion includes: a first The main body is mounted on the inner peripheral surface of the opening and is formed in a cylindrical shape along the axis; and the second main body is formed integrally with the first main body, and has a The bottom surface of the intersecting plane; the second body portion has a communicating portion that connects the internal space of the liquid storage container with the internal space of the plug when the sealing member is arranged in a state where the sealing member is in contact with the bottom surface, The communicating portion has a through hole extending along the axis; and a communicating groove extending on a plane intersecting the axis and communicating with the through hole at one end and communicating with the internal space of the plug at the other end. The plug described in claim 1, wherein the bottom surface portion has an endless annular protrusion extending around the axis on the outer peripheral side of the through hole with respect to the axis. The embolism described in item 1 or 2 of the scope of patent application, wherein the aforementioned embolism The plug body and the siphon tube are formed of a resin material, and the plug body and the siphon tube are connected by welding the resin material. A plug structure comprising: the plug described in any one of items 1 to 3 in the scope of the patent application; and is mounted on the inner peripheral surface of the first body portion, and has a sealing area in contact with the bottom surface portion The sealing part of the aforementioned sealing member. The plug structure described in claim 4, wherein a female thread is formed on the inner peripheral surface of the first body portion, and a male thread is formed on the outer peripheral surface of the sealing portion, and the first body portion and the seal The parts are connected by fastening the male thread to the female thread.

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