Liquid injection needle storage device

Abstract

The utility model belongs to the technical field of battery manufacturing, and discloses a liquid injection needle storage device which comprises a first cavity part and a second cavity part which are detachably connected, a liquid injection needle is arranged on the end face of the side, close to the second cavity part, of the first cavity part, a liquid injection pipe is arranged on the end face of the side, away from the second cavity part, of the first cavity part, and the liquid injection pipe communicates with the liquid injection needle. The first cavity part has a first state close to the second cavity part and a second state far away from the second cavity part, in the first state, the first cavity part and the second cavity part are connected in a sealed mode to form a sealed cavity, and the liquid injection needle is located in the sealed cavity. The liquid injection needle storage device is simple in structure and low in cost, the liquid injection needle is sealed in a sealed environment through the sealed cavity formed by the first cavity part and the second cavity part, and crystallization blockage of the liquid injection needle is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to a liquid injection needle storage device. Background Art

[0002] After the liquid injection machine finishes injecting liquid into the battery, the liquid injection needle is exposed to the air. After the liquid injection machine stops, if the dew point of the exposed liquid injection needle is not controlled for a long time, the electrolyte in the needle hole of the liquid injection needle and the electrolyte remaining on the surface of the needle will react with the moisture in the air and crystallize, blocking the liquid injection needle and making it inconvenient for cleaning and maintenance. Summary of the Utility Model

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide a liquid injection needle storage device.

[0004] In a first aspect of the present utility model, there is provided a liquid injection needle storage device, including: a first cavity part and a second cavity part which are detachably connected; wherein, one end face of the first cavity part close to the second cavity part is provided with a liquid injection needle, and one end face of the first cavity part far from the second cavity part is provided with a liquid injection tube, and the liquid injection tube is communicated with the liquid injection needle.

[0005] The first cavity part has a first state close to the second cavity part and a second state far from the second cavity part. In the first state, the first cavity part is hermetically connected with the second cavity part to form a sealed cavity, and the liquid injection needle is located in the sealed cavity.

[0006] The liquid injection needle storage device provided by the embodiment of the present application has a simple structure and low cost. By using the sealed cavity formed by the first cavity part and the second cavity part, the liquid injection needle is sealed in a sealed environment, effectively preventing the crystallization and blockage of the liquid injection needle.

[0007] In addition, the exhaust valve of the present utility model may also have the following additional technical features:

[0008] Preferably, the liquid injection needle is hermetically connected with the first cavity part, and one end of the liquid injection needle is connected with the liquid injection tube through a joint, and a check valve is arranged in the liquid injection tube;

[0009] The other end of the liquid injection needle extends towards the side far from the liquid injection tube, and the liquid injection needle extends beyond the lower end face of the first cavity part.

[0010] Preferably, a vacuum tube is arranged on the first cavity part or the second cavity part, and the vacuum tube is communicated with the sealed cavity, and a first stop valve is arranged in the vacuum tube.

[0011] Preferably, a vacuum pump is connected to the vacuum tube, and the vacuum pump is used to discharge the gas in the sealed cavity.

[0012] Preferably, a barometer is provided on the first cavity part or the second cavity part, the barometer is arranged avoiding the vacuum tube, and the barometer is used for measuring the air pressure value in the sealed cavity.

[0013] Preferably, a gas pipe is provided on the first cavity part or the second cavity part, the gas pipe is communicated with the sealed cavity, a second stop valve is arranged in the gas pipe, and the gas pipe is used for inputting inert gas into the sealed cavity.

[0014] Preferably, a gas supply device is connected to the gas pipe, and the gas supply device is used for inputting inert gas into the sealed cavity through the gas pipe.

[0015] Preferably, a connecting piece is arranged on one side of the first cavity part away from the second cavity part, and the liquid injection pipe passes through the connecting piece and is communicated with the liquid injection needle.

[0016] Preferably, the first cavity part includes a first cavity formed by enclosing a plurality of first side walls, a top wall is arranged on the upper part of the first side wall, the liquid injection needle is hermetically arranged on the end face of the top wall close to the second cavity part, and the liquid injection pipe is arranged on the end face of the top wall away from the second cavity part.

[0017] Preferably, the second cavity part includes a second cavity formed by enclosing a plurality of second side walls, an inverted conical bottom wall is arranged on the lower part of the second side wall, a liquid discharge port is arranged on the inverted conical bottom wall, a liquid discharge pipe is communicated with the liquid discharge port, and a third stop valve is arranged in the liquid discharge pipe.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0019] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives and advantages of the present application will become more apparent:

[0020] Figure 1 Is a three-dimensional structure diagram of the liquid injection needle storage device provided by the embodiment of the present application;

[0021] Figure 2 Is a three-dimensional structure diagram of the liquid injection needle storage device provided by the embodiment of the present application;

[0022] Figure 3 Is a front view of the liquid injection needle storage device provided by the embodiment of the present application;

[0023] In the above figures:

[0024] 100 First cavity part; 101 First side wall; 102 Top wall;

[0025] 110 Second cavity part; 111 Second side wall; 112 Inverted conical bottom wall; 113 Drain pipe; 114 Third cut-off valve;

[0026] 120 Liquid injection needle; 121 Connector;

[0027] 130 Liquid injection pipe; 131 Check valve;

[0028] 140 Vacuum pipe; 141 First cut-off valve;

[0029] 150 Gas pipe; 151 Second cut-off valve;

[0030] 160 Connector;

[0031] 170 Sealing washer. Detailed implementation manners

[0032] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that, for the sake of description, only the parts related to the utility model are shown in the drawings.

[0033] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0034] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0035] Unless the context otherwise requires, the term "comprising" is interpreted as open and inclusive throughout the specification and claims, that is, "including, but not limited to".

[0036] In the description of the specification, terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" are intended to indicate that specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described above may be included in any one or more embodiments or examples in any suitable manner.

[0037] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0038] As Figures 1 to 3 shown, in the first aspect of the present utility model, there is provided a liquid injection needle storage device, including: a first cavity portion 100 and a second cavity portion 110 that are detachably connected; wherein, a liquid injection needle 120 is disposed on one end face of the first cavity portion 100 close to the second cavity portion 110, and a liquid injection tube 130 is disposed on one end face of the first cavity portion 100 away from the second cavity portion 110, and the liquid injection tube 130 is communicatively connected to the liquid injection needle 120.

[0039] The first cavity portion 100 has a first state close to the second cavity portion 110 and a second state away from the second cavity portion 110. In the first state, the first cavity portion 100 is hermetically connected to the second cavity portion 110 to form a sealed cavity, and the liquid injection needle 120 is located within the sealed cavity.

[0040] Specifically, the liquid injection needle 120 and the liquid injection tube 130 are respectively disposed on two opposite end faces of the first cavity portion 100. Among them, the liquid injection needle 120 is disposed on one end face of the first cavity portion 100 facing the second cavity portion 110 and extends toward the side close to the second cavity portion 110; the liquid injection tube 130 is disposed on one end face of the first cavity portion 100 away from the second cavity portion 110, and the liquid injection tube 130 passes through the corresponding end face of the first cavity portion 100 and is communicatively connected to the liquid injection needle 120. The electrolyte is conveyed to the liquid injection needle 120 through the liquid injection tube 130, so as to facilitate subsequent injection of the electrolyte into the battery through the liquid injection needle 120.

[0041] The first cavity part 100 and the second cavity part 110 are detachably connected. Both the first cavity part 100 and the second cavity part 110 are hollow structures. The first cavity part 100 has a first state close to the second cavity part 110 and a second state away from the second cavity part 110. In the first state, the sealing gasket 170 provided at the bottom end of the first cavity part 100 is sealed with the second cavity part 110 to form a sealed cavity, and the injection needle 120 is sealed to a closed space through the sealed cavity to prevent the injection needle 120 from being exposed to the outside for a long time and causing crystallization. In the second state, the first cavity part 100 and the second cavity part 110 are separated, which is convenient for the injection needle 120 to inject liquid into the battery and convenient for cleaning and maintenance of the injection needle 120.

[0042] The injection needle storage device provided in the embodiment of the present application has a simple structure and low cost. It uses a sealed cavity formed by the first cavity portion 100 and the second cavity portion 110 to seal the injection needle 120 into a sealed environment, thereby effectively preventing crystallization blockage of the injection needle 120.

[0043] In some embodiments, Figure 1 and Figure 2 As shown, the injection needle 120 is sealed and connected to the first cavity portion 100, and one end of the injection needle 120 is connected to the injection tube 130 through a joint 121, and a check valve 131 is provided in the injection tube 130;

[0044] The other end of the injection needle 120 is extended toward a side away from the injection tube 130 , and the injection needle 120 exceeds the lower end surface of the first cavity portion 100 .

[0045] Specifically, the first cavity portion 100 is provided with a mounting hole, and the injection needle 120 passes through the mounting hole and is sealed and connected to the first cavity portion 100 through a sealing gasket 170 to ensure a sealing effect, wherein the mounting hole can be located at the center of the first cavity portion 100. The upper end of the injection needle 120 is connected to the injection tube 130 through a metal joint 121, which is convenient for replacing different injection needles 120. The lower end of the injection needle 120 is extended toward a side away from the injection tube 130, and the lower end of the injection tube 130 extends out of the lower end surface of the first cavity portion 100, which is convenient for the injection operation of the injection needle 120. A check valve 131 is provided on the injection tube 130, and the opening and closing of the injection tube 130 can be controlled by the check valve 131. When the injection needle 120 performs the injection operation, the check valve 131 controls the opening of the injection tube 130; when the injection needle 120 stops working, the check valve 131 controls the closure of the injection tube 130 to prevent the injection needle 120 from dripping, thereby avoiding the residual electrolyte in the injection needle 120.

[0046] In some embodiments, a vacuum tube 140 is disposed on the first cavity portion 100 or the second cavity portion 110 . The vacuum tube 140 is connected to the sealed cavity, and a first stop valve 141 is disposed in the vacuum tube 140 .

[0047] Specifically, a vacuum tube 140 is connected to the side wall of the first cavity portion 100 or the second cavity portion 110. For example, Figure 1 and Figure 2 As shown, the vacuum tube 140 is installed on the side wall corresponding to the second cavity part 110 through a flange, and the vacuum tube 140 is connected with the hollow structure in the first cavity part 100 or the second cavity part 110, so that the vacuum tube 140 is connected with the sealed cavity, and the vacuum tube 140 is provided with a first stop valve 141, and the first stop valve 141 can control the conduction and closing of the vacuum tube 140. The vacuum tube 140 is closed by controlling the first stop valve 141, so that the sealed cavity can form a completely closed structure; the vacuum tube 140 is turned on by controlling the first stop valve 141, and the vacuum tube 140 can discharge the gas in the closed cavity, so that the sealed cavity forms a sealed environment, and the injection needle 120 can avoid the contact between the electrolyte and the moisture in the air in the vacuum environment, and prevent the injection needle 120 from crystallization and clogging.

[0048] In some embodiments, the vacuum tube 140 is connected to a vacuum pump, and the vacuum pump is used to discharge the gas in the sealed cavity.

[0049] Specifically, the vacuum pump is connected to the sealed cavity through the vacuum tube 140, and the air in the sealed cavity is discharged by vacuuming to form a vacuum environment in the sealed cavity, which is convenient for the storage of the injection needle 120 and prevents the injection needle 120 from being blocked by crystallization.

[0050] In some embodiments, a pressure gauge is disposed on the first cavity portion 100 or the second cavity portion 110 , and the pressure gauge is disposed away from the vacuum tube 140 , and the pressure gauge is used to measure the air pressure value in the sealed cavity.

[0051] Specifically, a pressure gauge is installed on the side wall of the first cavity portion 100 or the second cavity portion 110, and the pressure gauge is arranged away from the vacuum tube 140. For example, Figures 1 to 3 As shown, the vacuum tube 140 and the barometer are respectively installed on two adjacent side walls of the second cavity portion 110. The barometer can be an electronic barometer, which can measure the air pressure value in the sealed cavity in real time to determine whether the air pressure value in the sealed cavity reaches a preset pressure threshold. When the preset pressure threshold is reached, it indicates that the vacuum environment in the sealed cavity reaches the required vacuum condition, which facilitates the storage of the injection needle 120. Among them, the preset pressure threshold can be set according to actual needs, and the embodiment of the present application is not particularly limited.

[0052] In some embodiments, a gas pipe 150 is provided on the first cavity portion 100 or the second cavity portion 110. The gas pipe 150 is communicated with the sealed cavity. A second cut-off valve 151 is provided in the gas pipe 150. The gas pipe 150 is used to input inert gas into the sealed cavity.

[0053] Specifically, the gas pipe 150 is communicated and provided on the side wall of the first cavity portion 100 or the second cavity portion 110. As Figures 1 to 3 shown, the gas pipe 150 is installed on the corresponding side wall of the second cavity portion 110 through a flange. Exemplarily, for example, the gas pipe 150 and the pressure gauge are respectively provided on two adjacent side walls of the first cavity portion 100, and the gas pipe 150 and the vacuum pipe 140 are respectively provided on two opposite side walls of the first cavity portion 100; again, for example, the gas pipe 150 and the pressure gauge are respectively provided on two adjacent side walls of the second cavity portion 110, and the gas pipe 150 and the vacuum pipe 140 are respectively provided on two opposite side walls of the second cavity portion 110; again, for example, the gas pipe 150 and the vacuum pipe 140 are respectively provided on the corresponding side walls of the first cavity portion 100 and the second cavity portion 110, and the pressure gauge is provided on the side wall of the first cavity portion 100 or the second cavity portion 110 and is arranged avoiding the gas pipe 150 and the vacuum pipe 140.

[0054] The gas pipe 150 is communicated with the hollow structure in the first cavity portion 100 or the second cavity portion 110, so that the gas pipe 150 is communicated with the sealed cavity. The gas pipe 150 is provided with a second cut-off valve 151, and the second cut-off valve 151 can control the conduction and closing of the gas pipe 150.

[0055] By controlling the closing of the gas pipe 150 through the second cut-off valve 151, a completely enclosed structure can be formed in the sealed cavity; by controlling the conduction of the gas pipe 150 through the first cut-off valve 141, inert gas such as nitrogen can be transported into the enclosed cavity through the gas pipe 150. The inert gas can prevent the electrolyte on the liquid injection needle 120 from contacting the moisture in the air, prevent the liquid injection needle 120 from being crystallized and blocked, and facilitate the cleaning and maintenance of the liquid injection needle 120.

[0056] In some embodiments, a gas supply device is connected to the gas pipe 150. The gas supply device is used to input inert gas into the sealed cavity through the gas pipe 150.

[0057] Specifically, the gas supply device is used to provide inert gas. The gas supply device transports inert gas into the sealed cavity through the gas pipe 150, so as to form a sealed inert environment in the sealed cavity, prevent the electrolyte on the liquid injection needle 120 from contacting the moisture in the air, facilitate the storage of the liquid injection needle 120, and prevent the liquid injection needle 120 from being crystallized and blocked.

[0058] In some embodiments, as Figures 1 to 3 shown, a connecting member 160 is provided on a side of the first cavity portion 100 away from the second cavity portion 110, and the liquid injection tube 130 passes through the connecting member 160 and is communicatively connected to the liquid injection needle 120.

[0059] Specifically, a connecting member 160 is detachably connected to a side of the first cavity portion 100 away from the second cavity portion 110. The connecting member 160 can be a square connecting block, and the detachable connection between the first cavity portion 100 and the connecting member 160 is realized by means of bolt screwing. The liquid injection tube 130 passes through the connecting member 160 and is communicatively connected to the liquid injection needle 120. The connecting member 160 can be connected to the three-axis moving robot arm of the liquid injection machine, which is convenient for the robot arm to grasp the connecting member 160 to perform the liquid injection operation on the liquid injection needle 120.

[0060] In some embodiments, as Figure 1 and Figure 2 shown, the first cavity portion 100 includes a first cavity formed by enclosing a plurality of first side walls 101. A top wall 102 is provided on the upper portion of the first side wall 101. The liquid injection needle 120 is hermetically arranged on an end face of the top wall 102 close to the second cavity portion 110, and the liquid injection tube 130 is arranged on an end face of the top wall 102 away from the second cavity portion 110.

[0061] Specifically, the first cavity portion 100 includes a first cavity formed by enclosing a plurality of first side walls 101. The first cavity can be a square or circular cavity. The top of the first side wall 101 has a top wall 102. The liquid injection needle 120 and the liquid injection tube 130 are respectively arranged on two opposite side faces of the top wall 102. Among them, the liquid injection needle 120 is arranged on an end face of the top wall 102 facing the second cavity portion 110, and the lower end of the liquid injection needle 120 extends beyond the lower end face of the first side wall 101; the liquid injection tube 130 is arranged on an end face of the top wall 102 away from the second cavity portion 110, and the liquid injection tube 130 is communicatively connected to the liquid injection needle 120. A sealing gasket 170 is provided at the bottom end of the first side wall 101, which is convenient for the sealing connection between the first cavity portion 100 and the second cavity portion 110.

[0062] In some embodiments, as Figure 1 and Figure 2 shown, the second cavity portion 110 includes a second cavity formed by enclosing a plurality of second side walls 111. An inverted conical bottom wall 112 is provided on the lower portion of the second side wall 111. A drain port is provided on the inverted conical bottom wall 112. A drain tube 113 is communicated with the drain port, and a third stop valve 114 is arranged in the drain tube 113.

[0063] Specifically, the second cavity part 110 includes a second cavity formed by enclosing a plurality of second side walls 111. The second cavity part 110 can be a square cavity or a circular cavity. Among them, the structures of the first cavity and the second cavity are the same. For example, both the first cavity and the second cavity are square cavities, which is convenient for their plug-in and mating connections. A tapered bottom wall 112 is provided at the bottom end of the second side wall 111, such as an inverted conical bottom wall or an inverted pyramid-shaped bottom wall. A drain port is provided at the bottom end of the tapered bottom wall 112, and a drain pipe 113 is connected to the drain port. A third stop valve 114 is provided on the drain pipe 113, and the third stop valve 114 can control the on and off of the drain pipe 113. For example, when it is necessary to store the injection needle 120 in a sealed manner, the third stop valve 114 can be used to control the drain pipe 113 to close; if electrolyte drips into the sealed cavity during the sealed storage of the injection needle 120, the third stop valve 114 controls the drain pipe 113 to conduct, so as to timely drain the electrolyte in the sealed cavity.

[0064] The method of using the injection needle storage device provided by the embodiment of the present application is as follows:

[0065] After the injection machine finishes injecting liquid, the check valve 131 on the injection pipe 130 closes. The first cavity part 100 equipped with the injection needle 120 moves to the upper position of the second cavity part 110 through the movement of the mechanical hand connection member 160, and then the first cavity part 100 is controlled to descend so that the first cavity part 100 and the second cavity part 110 are hermetically connected to form a sealed cavity;

[0066] Open the first stop valve 141, and control the vacuum pump to evacuate the sealed cavity through the vacuum pipe 140 so that the pressure value in the sealed cavity reaches the preset pressure threshold, and then close the first stop valve 141;

[0067] Open the second stop valve 151, and then control the gas supply device to transport inert gas such as nitrogen into the sealed cavity through the gas pipe 150. When the concentration of the inert gas in the sealed cavity reaches the preset concentration value, stop transporting the inert gas and close the second stop valve 151.

[0068] In the embodiment of the present application, by means of evacuating and filling with inert gas, the injection needle 120 is completely enclosed in a sealed environment, effectively avoiding direct contact between the injection needle 120 and the moisture in the air and preventing the injection needle 120 from crystallizing and blocking.

[0069] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept of the utility model. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A liquid injection needle storage device, characterized in that, Comprising: A first cavity part (100) and a second cavity part (110) which are detachably connected; wherein, on one end face of the first cavity part (100) close to the second cavity part (110), a liquid injection needle (120) is arranged, and on one end face of the first cavity part (100) far from the second cavity part (110), a liquid injection pipe (130) is arranged, and the liquid injection pipe (130) is communicated with the liquid injection needle (120). The first cavity part (100) has a first state close to the second cavity part (110) and a second state far from the second cavity part (110). In the first state, the first cavity part (100) is hermetically connected with the second cavity part (110) to form a sealed cavity, and the liquid injection needle (120) is located in the sealed cavity.

2. The liquid injection needle storage device according to claim 1, characterized in that The liquid injection needle (120) is hermetically connected with the first cavity part (100), and one end of the liquid injection needle (120) is connected with the liquid injection pipe (130) through a joint (121), and a check valve (131) is arranged in the liquid injection pipe (130). The other end of the liquid injection needle (120) extends towards the side far from the liquid injection pipe (130), and the liquid injection needle (120) extends beyond the lower end face of the first cavity part (100).

3. The liquid injection needle storage device according to claim 1, wherein, A vacuum pipe (140) is arranged on the first cavity part (100) or the second cavity part (110), and the vacuum pipe (140) is communicated with the sealed cavity, and a first cut-off valve (141) is arranged in the vacuum pipe (140).

4. The liquid injection needle storage device according to claim 3, wherein, A vacuum pump is connected to the vacuum pipe (140), and the vacuum pump is used to discharge the gas in the sealed cavity.

5. The liquid injection needle storage device according to claim 3, characterized in that, A pressure gauge is arranged on the first cavity part (100) or the second cavity part (110), and the pressure gauge is arranged avoiding the vacuum pipe (140), and the pressure gauge is used to measure the air pressure value in the sealed cavity.

6. The liquid injection needle storage device according to any one of claims 1-5, characterized in that, A gas pipe (150) is arranged on the first cavity part (100) or the second cavity part (110), and the gas pipe (150) is communicated with the sealed cavity, and a second cut-off valve (151) is arranged in the gas pipe (150), and the gas pipe (150) is used to input inert gas into the sealed cavity.

7. The liquid injection needle storage device according to claim 6, characterized in that A gas supply device is connected to the gas pipe (150), and the gas supply device is used to input inert gas into the sealed cavity through the gas pipe (150).

8. The liquid injection needle storage device according to claim 1, characterized in that, A connecting piece (160) is arranged on the side of the first cavity part (100) far from the second cavity part (110), and the liquid injection pipe (130) passes through the connecting piece (160) and is communicated with the liquid injection needle (120).

9. The liquid injection needle storage device according to claim 1, wherein, The first cavity portion (100) includes a first cavity formed by enclosing a plurality of first side walls (101). An upper portion of the first side walls (101) is provided with a top wall (102). The liquid injection needle (120) is sealingly disposed on an end surface of the top wall (102) close to the second cavity portion (110), and the liquid injection tube (130) is disposed on an end surface of the top wall (102) away from the second cavity portion (110).

10. The liquid injection needle storage device according to claim 1, characterized in that, The second cavity portion (110) includes a second cavity formed by enclosing a plurality of second side walls (111). A lower portion of the second side walls (111) is provided with an inverted conical bottom wall (112). A liquid discharge port is provided on the inverted conical bottom wall (112). The liquid discharge port is communicated with a liquid discharge pipe (113), and a third stop valve (114) is disposed in the liquid discharge pipe (113).

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