adapter

Abstract

To prevent gas backflow. [Solution] A joint 130 fixed to the hose 200 is inserted into the first end 111 of the first pipe section 110, a second pipe section 140 is inserted into the second end 112 of the first pipe section 110, a valve body section 150 having a first valve body 151, a second valve body 152 and a connecting section 153 is movably arranged inside the first pipe section 110, the first valve body 151 is positioned on the first end 111 side of the first pipe section, and the second valve body 152 is positioned on the second end of the first pipe section 110 The first valve body 151 and the second valve body 152 are connected by a connecting portion 153, the protruding portion 1131 of the first pipe portion 110, whose inner diameter is smaller than the outer diameter of the first valve body 151 and the outer diameter of the second valve body 152, is positioned between the first valve body 151 and the second valve body 152, the first spring 160 is positioned between the joint portion 130 and the first valve body 151, and the second spring 170 is positioned between the second pipe portion 140 and the second valve body 152.

Description

Technical Field

[0001] The present invention relates to an adapter.

Background Art

[0002] Patent Document 1 discloses a technology that, when a differential pressure exceeding a specified level is generated by backflow of gas, the valve element is moved to a non-return position by this differential pressure to close the gas flow path and prevent backflow of the gas.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of Invention

Problem to be Solved by the Invention

[0004] However, with the technology disclosed in Patent Document 1, the gas flow path cannot be closed and backflow of gas cannot be prevented unless a differential pressure exceeding the specified level is generated. To achieve closing with a small differential pressure, it is necessary to reduce the weight of the valve element, but there is a limit to reducing the weight of the valve element.

[0005] The present invention aims to prevent backflow of gas.

Means for Solving the Problem

[0006] To solve the above problems, an adapter according to one embodiment of the present invention is an adapter for connecting a hose to a tank, the adapter having a first pipe section, a joint section, a second pipe section, a valve body section, a first spring, and a second spring, the first end of the joint section being fixed to the hose, the second end of the joint section being inserted into the first end of the first pipe section, the first end of the second pipe section being inserted into the second end of the first pipe section, the valve body section being movably arranged inside the first pipe section, and having a first valve body, a second valve body, and a connecting section, the first valve body being arranged on the first end side of the first pipe section, and the second valve body being on the second side of the first pipe section The connecting portion is located at the end, and connects the first valve body and the second valve body. The first pipe portion has a projection that protrudes inward, which is located between the first valve body and the second valve body. The inner diameter of the projection is smaller than the outer diameter of the first valve body and the outer diameter of the second valve body. The first spring is located inside the first pipe portion, between the second end of the joint and the first valve body, and in contact with the second end of the joint and the first valve body. The second spring is located inside the first pipe portion, between the first end of the second pipe portion and the second valve body, and in contact with the first end of the second pipe portion and the second valve body. [Effects of the Invention]

[0007] According to the present invention, it becomes possible to prevent gas backflow. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of adapter 100 according to one embodiment of the present invention (open state). [Figure 2] This is a cross-sectional view of the adapter 100 when it is cut by a plane that intersects the cutting plane in Figure 1 at a first angle (for example, 90 degrees) along the central axis X. [Figure 3] This diagram illustrates the gas flow within adapter 100. [Figure 4]This diagram illustrates the state in which the stopping member 1513 is in contact with the joint portion 130. [Figure 5] This diagram illustrates the state in which the stopping member 1523 is in contact with the second pipe section 140. [Figure 6] This figure shows a cross-sectional view of the adapter 100 when it has been removed from the tank 300 (first closed state). [Figure 7] This figure shows a cross-sectional view of the adapter 100 when the adapter 100 is attached to the tank 300 and the hose 200 is pulled towards the first end 111 of the first pipe section 110 (second closed state). [Modes for carrying out the invention]

[0009] <Configuration of Adapter 100> Figures 1 and 2 show cross-sectional views of an adapter 100 according to one embodiment of the present invention. The adapter 100 is an adapter for connecting a hose 200 (for example, a high-pressure hose) to a tank 300, and is fixed to the hose 200. The tank 300 is, for example, a high-pressure tank for LPG (Liquefied Petroleum Gas), and the hose 200 is, for example, a high-pressure hose that carries gas from the high-pressure tank. Figures 1 and 2 show the state in which the adapter 100 fixed to the hose 200 is attached to the tank 300, and the hose 200 is connected to the tank 300.

[0010] The adapter 100 has a first tubular portion 110. The first tubular portion 110 is a tubular member, and Figure 1 is a cross-sectional view of the adapter 100 when it is cut by a plane passing through the central axis X of the first tubular portion 110. Figure 2 is a cross-sectional view of the adapter 100 when it is cut by a plane that intersects the cutting plane in Figure 1 at a first angle (for example, 90 degrees) along the central axis X.

[0011] The first pipe section 110 has a first end 111 and a second end 112 at both ends in the direction in which the central axis X extends (X direction). When the adapter 100 is attached to the tank 300, the second end 112 is inserted into the tank 300 as shown in Figures 1 and 2, and gas from the tank 300 flows inside the first pipe section 110 as shown in Figure 3.

[0012] The first pipe section 110 is fixed to the mounting opening of the tank 300 by a connecting section 120 that covers the outer circumference of the outer surface of the first pipe section 110, with the second end 112 inserted into the mounting opening of the tank 300. For example, a female thread is formed on the outer surface of the connecting section 120, and a male thread is formed on the inner surface of the mounting opening of the tank 300, and the first pipe section 110 is fixed to the mounting opening of the tank 300 by screwing the male and female threads together. The connecting section 120 may also have a handle 121 that is used when attaching the adapter 100 to the tank 300, that is, when fixing the first pipe section 110 to the tank 300, as shown in Figure 1.

[0013] A sealing member 1121 is positioned at the second end 112 of the first pipe section 110. This sealing member 1121 seals the space between the outer surface of the second end 112 and the mounting opening of the tank 300 when the adapter 100 is attached to the tank 300, preventing gas from leaking out. For example, a groove 1122 may be formed on the outer circumferential surface of the second end 112 of the first pipe section 110, and the sealing member 1121 may be fitted into this groove 1122. The sealing member 1121 is, for example, an O-ring made of an elastic material.

[0014] The adapter 100 further has a joint 130. The joint 130 is a tubular joint for fixing the first pipe section 110 to the hose (i.e., fixing the adapter 100 to the hose 200). The joint 130 has a first end 131 and a second end 132 at both ends in the X direction. The first end 131 is inserted into the hose 200, and the second end 132 is inserted into the first pipe section 110 from the side of the first end 111. Gas flowing out of the tank 300 into the first pipe section 110 flows into the hose 200 through this joint 130.

[0015] A displacement prevention member 133 is positioned on the outer circumferential surface of the portion of the joint 130 that is inserted into the first pipe section 110. This displacement prevention member 133 prevents the joint 130 from being displaced in the X direction. The displacement prevention member 133 is a so-called friction ring, and by generating frictional resistance between it and the inner circumferential surface of the first pipe section 110, it prevents the joint 130 from being displaced in the X direction. Therefore, unless a force greater than the static frictional force between the displacement prevention member 133 and the inner circumferential surface of the first pipe section 110 is applied to the joint 130, the relative position of the joint 130 with respect to the first pipe section 110 remains at the initial position shown in Figures 1 and 2. For example, a first groove 134 may be formed on the outer circumferential surface of the joint 130, and the displacement prevention member 133 may be fitted into this first groove 134. The displacement prevention member 133 may be, for example, a metal C-ring.

[0016] A sealing member 135 is positioned on the outer circumferential surface of the portion of the joint 130 that is inserted into the first pipe section 110. This sealing member 135 seals the space between the inner circumferential surface of the first pipe section 110 and the outer surface of the joint 130, preventing gas from leaking out. For example, a second groove 136 may be formed on the outer circumferential surface of the joint 130, and the sealing member 135 may be fitted into this second groove 136. The sealing member 135 may be, for example, an O-ring made of an elastic material.

[0017] A hose fixing portion 1311 is formed on the outer peripheral surface of the first end 131 of the joint portion 130. When the first end 131 of the joint portion 130 is inserted into the hose 200, the joint portion 130 is fixed to the hose 200 by this hose fixing portion 1311.

[0018] The adapter 100 further includes a second pipe portion 140. The second pipe portion 140 is a tubular member. The second pipe portion 140 has a first end 141 and a second end 142 at both ends in the X direction, the outer diameter of the first end 141 of the second pipe portion 140 is smaller than the inner diameter of the second end 112 of the first pipe portion 110, and the first end 141 of the second pipe portion 140 is inserted into the second end 112 of the first pipe portion 110. The second pipe portion 140 is movable in the X direction.

[0019] As shown in FIGS. 1 and 2, the second end 142 of the second pipe portion 140 is in contact with the mounting port of the tank 300, and is pushed toward the first end 111 side of the first pipe portion 110 by the mounting port of the tank 300. The first pipe portion 110 has a central portion 113 between the first end 111 and the second end 112, the inner diameter of the central portion 113 is smaller than the inner diameter of the second end 112, and a step exists between the second end 112 and the central portion 113. The outer diameter of the second end 142 of the second pipe portion 140 is larger than the inner diameter of the central portion 113 of the first pipe portion 110, and the first end 141 of the second pipe portion 140 cannot be inserted into the central portion 113 of the first pipe portion 110. That is, the displacement of the second pipe portion 140 toward the first end 111 side of the first pipe portion 110 is restricted by the step between the second end 112 and the central portion 113 of the first pipe portion 110.

[0020] The outer diameter of the second end portion 142 of the second pipe portion 140 may be made larger than the outer diameter of the first end portion 141 of the second pipe portion 140. At this time, in a state where the adapter 100 is attached to the tank 300, the second end portion 142 of the second pipe portion 140 may be in contact with the second end portion 112 of the first pipe portion 110, for example, as shown in Figures 1 and 2. The inner peripheral surface of the second end portion 112 of the first pipe portion 110 may have a tapered portion, as shown in Figures 1 and 2, to facilitate insertion of the second pipe portion 140.

[0021] The adapter 100 further includes a valve body portion 150. The valve body portion 150 is inserted into the interior of the first pipe portion 110, and is movably disposed between the joint portion 130 and the second pipe portion 140. As shown in Figure 1, the valve body portion 150 has a first valve body 151, a second valve body 152, and a connection portion 153. The first valve body 151 is a columnar member and is disposed on the first end portion 111 side of the first pipe portion 110, and the second valve body 152 is a columnar member and is disposed on the second end portion 112 side of the first pipe portion 110. The connection portion 153 is a member that connects the first valve body 151 and the second valve body 152.

[0022] The adapter 100 further includes a first spring 160 and a second spring 170. The first spring 160 is disposed between the joint portion 130 and the valve body portion 150 (the first valve body 151) so as to be in contact with the joint portion 130 and the valve body portion 150 (the first valve body 151), and the second spring 170 is disposed between the second pipe portion 140 and the valve body portion 150 (the second valve body 152) so as to be in contact with the second pipe portion 140 and the valve body portion 150 (the second valve body 152). When shorter than the natural length, the first spring 160 and the second spring 170 generate a restoring force to extend in the X direction, and when longer than the natural length, generate a restoring force to contract in the X direction.

[0023] When the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position (as shown in Figures 1 and 2), the first spring 160 has a first length L1 which is shorter than its natural length, and the second spring 170 has a second length L2 which is shorter than its natural length. Therefore, when the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position (as shown in Figures 1 and 2), the first spring 160 applies a force to the joint portion 130 and the valve body portion 150 in a direction that separates the joint portion 130 and the valve body portion 150 (that is, the first spring 160 applies a force to the joint portion 130 toward the first end portion 111 of the first pipe portion 110, and applies a force to the valve body portion 150 (first valve body 151) toward the second end portion 112 of the first pipe portion 110). Furthermore, when the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position (as shown in Figures 1 and 2), the second spring 170 applies force to the second pipe portion 140 and the valve body portion 150 in a direction that separates them (that is, the second spring 170 applies force to the second pipe portion 140 toward the second end portion 112 of the first pipe portion 110, and applies force to the valve body portion 150 (second valve body 152) toward the first end portion 111 of the first pipe portion 110).

[0024] In this embodiment, when the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position (as shown in Figures 1 and 2) (that is, when the first spring 160 has a first length L1 and the second spring 170 has a second length L2), the sum of the force exerted by the first spring 160 on the joint portion 130 and the force exerted by the pressure of the gas from the tank 300 on the joint portion 130 is less than the static friction force between the displacement prevention member 133 of the joint portion 130 and the inner circumferential surface of the first pipe portion 110. Therefore, when the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position (as shown in Figures 1 and 2), the joint portion 130 does not move relative to the first pipe portion 110 due to the force exerted on the joint portion 130 by the first spring 160, and under normal use, the relative position of the joint portion 130 with respect to the first pipe portion 110 remains in its initial position.

[0025] The central portion 113 of the first pipe section 110 has a projection 1131 that protrudes inward. The projection 1131 has a smaller inner diameter than the rest of the central portion 113, and the inner circumference of the projection 1131 is smaller than the outer diameter of the first valve body 151 and the outer diameter of the second valve body 152, so the projection 1131 is located between the first valve body 151 and the second valve body 152. The surface of the projection 1131 on the first end 111 side of the first pipe section 110 is the first valve seat 1132 which functions as a valve seat for the first valve body 151, and the surface of the projection 1131 on the second end 112 side of the first pipe section 110 is the second valve seat 1133 which functions as a valve seat for the second valve body 152. Therefore, in this embodiment, the adapter 100 can take on three states: an open state (Figures 1 and 2) in which the first valve body 151 is not in contact with the first valve seat 1132 and the second valve body 152 is not in contact with the second valve seat 1133, and the gas flow path is open; a first closed state (Figure 6) in which the first valve body 151 and the first valve seat 1132 are in contact and the gas flow path is closed; and a second closed state (Figure 7) in which the second valve body 152 and the second valve seat 1133 are in contact and the gas flow path is closed.

[0026] In this embodiment, when the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position, the adapter 100 is in an open state, as shown in Figures 1 and 2, where the first valve body 151 is not in contact with the first valve seat 1132 and the second valve body 152 is not in contact with the second valve seat 1133. In this embodiment, the connection portion 153 is shaped to allow gas to pass through when the valve body portion 150 is in the first state. For example, in the example shown in Figures 1 and 2, in the cross-sectional view of Figure 1, the connection portion 153 is in contact with the protruding portion 1131 of the first pipe portion 110, but in the cross-sectional view of Figure 2, the connection portion 153 is not in contact with the protruding portion 1131 of the first pipe portion 110. Therefore, in this embodiment, when the adapter 100 is attached to the tank 300 and the relative position of the joint portion 130 with respect to the first pipe portion 110 is in its initial position, gas flows from the tank 300 through the adapter 100 into the hose 200, as shown in Figure 3.

[0027] The first valve body 151 may further include a stopping member 1513. As shown in Figures 1 and 2, the stopping member 1513 is a member that protrudes from the first valve body 151 toward the first end 111 of the first pipe section 110, and prevents the second valve body 152 from contacting the second valve seat 1133 when the adapter 100 is attached to the tank 300 and the relative position of the joint section 130 with respect to the first pipe section 110 is in its initial position (as shown in Figures 1 and 2). For example, even if the gas pressure from the tank 300 suddenly increases and the gas pushes the valve body 150, causing it to move toward the first end 111 of the first pipe section 110, as shown in Figure 4, the stopping member 1513 contacts the joint section 130, stopping the movement of the valve body 150 and preventing the second valve body 152 from contacting the second valve seat 1133. The stopping member 1513 of the first valve body 151 is shaped to allow gas to pass through when it is in contact with the joint section 130. The stopping member 1513 of the first valve body 151 is, for example, columnar.

[0028] The second valve body 152 may further include a stopping member 1523. As shown in Figures 1 and 2, the stopping member 1523 is a member that protrudes from the second valve body 152 toward the second end 112 of the first pipe section 110, and prevents the first valve body 151 from contacting the first valve seat 1132 when the adapter 100 is attached to the tank 300 and the relative position of the joint section 130 with respect to the first pipe section 110 is in its initial position (as shown in Figures 1 and 2). For example, even if the balance between the restoring force of the first spring 160 and the restoring force of the second spring 170 is disrupted, and the valve body 150 is pushed by the first spring 160, causing the valve body 150 to move toward the second end 112 of the first pipe 110, the stopping member 1523 contacts the second pipe 140, stopping the movement of the valve body 150 and preventing the first valve body 151 from contacting the first valve seat 1132. The stopping member 1523 of the second valve body 152 is shaped to allow gas to pass through when it is in contact with the second pipe 140. The stopping member 1513 of the first valve body 151 is, for example, columnar.

[0029] <Adapter 100 removed from tank 300 (first closed state)> Figure 6 is a cross-sectional view of the adapter 100 when it has been removed from the tank 300. In Figure 6, the relative position of the joint 130 with respect to the first pipe section 110 is the initial position. When the adapter 100 is removed from the tank 300 while the relative position of the joint 130 with respect to the first pipe section 110 is the initial position, the second pipe section 140 is no longer pushed from the tank 300 toward the first end 111 of the first pipe section 110, so the first spring 160 and the second spring 170 extend toward the second end 112 of the first pipe section 110. As the first spring 160 extends, the valve body 150 moves toward the second end 112 of the first pipe 110, as shown in Figure 6, and the adapter 100 enters a first closed state where the first valve body 151 of the valve body 150 contacts the first valve seat 1132.

[0030] Therefore, in this embodiment, when the adapter 100 is removed from the tank 300, it is possible to prevent the gas in the hose 200 from flowing back and leaking out. In particular, in this embodiment, when the adapter 100 is removed from the tank 300, it is possible to prevent the gas in the hose 200 from flowing back even if there is no differential pressure between the outside and the inside of the hose 200 (adapter 100).

[0031] In the first closed state, the length of the first spring 160 is a third length L3 (L3 > L1) which is shorter than its natural length, and the length of the second spring 170 is a fourth length L4 (L4 > L2) which is less than or equal to its natural length. It is preferable that the restoring force of the first spring 160 be greater than the restoring force of the second spring 170. By doing so, in the first closed state, the force acting on the valve body 150 in the direction of the second end 112 of the first pipe 110 becomes positive, and this force presses the first valve body 151 against the first valve seat 1132, maintaining the state in which the first valve body 151 is in contact with the first valve seat 1132.

[0032] The first valve body 151 may further include a sealing member 1511. The sealing member 1511 is positioned to contact the first valve seat 1132 when the first valve body 151 of the valve body portion 150 contacts the first valve seat 1132. This ensures a more reliable seal between the valve body portion 150 and the first pipe portion 110. For example, a groove 1512 may be formed in the first valve body 151, and the sealing member 1511 may be fitted into this groove 1512. The sealing member 1511 may be, for example, an O-ring made of an elastic material.

[0033] The outer circumferential surface of the first end 141 of the second pipe section 140 is preferably provided with a projection 1411 that has a larger outer diameter than the other parts, as shown in Figures 1, 2, and 6. To restrict the movement of this projection 1411 in the X direction, a recess 1123 with a larger inner diameter than the other parts is preferably formed on the inner circumferential surface of the second end 112 of the first pipe section 110, as shown in Figures 1, 2, and 6. In this way, it becomes possible to restrict the movement of the second pipe section 140 in the X direction. As a result, the second pipe section 140 is pushed by the first spring 160, preventing the second pipe section 140 from coming out of the first pipe section 110. The projection 1411 is, for example, a ring-shaped member (for example, a metal C-ring). If the projection 1411 is a ring-shaped member, it is preferable to form a groove 1412 on the outer circumferential surface of the first end 141 of the second tubular portion 140, and to mount the projection 1411 in this groove 1412.

[0034] The outer surface of the second pipe section 140 may be marked with a mark (first mark) indicating that the space between the valve body section 150 and the first pipe section 110 is sealed. The first mark should be placed on the outer surface of the second pipe section 140 in a location that is not exposed to the outside when the first valve body 151 is not in contact with the first valve seat 1132 (i.e., it is inside the first pipe section 110), but is exposed to the outside when the first valve body 151 is in contact with the first valve seat 1132.

[0035] <When hose 200 is pulled (second closed state)> Figure 7 is a cross-sectional view of the adapter 100 when the adapter 100 is attached to the tank 300 and the hose 200 is pulled toward the first end 111 of the first pipe section 110. When the hose 200 is pulled toward the first end 111 of the first pipe section 110 with a force greater than the static friction force between the displacement prevention member 133 of the joint section 130 and the inner circumferential surface of the first pipe section 110, the second end 132 of the joint section 130 moves inside the first pipe section 110, and as a result, the first spring 160 and the second spring 170 extend toward the first end 111 of the first pipe section 110. When the relative position of the joint portion 130 with respect to the first pipe portion 110 moves by a distance greater than or equal to a predetermined distance (first distance) from the initial position toward the first end 111 of the first pipe portion 110, the second spring 170 extends, and as shown in Figure 7, the valve body portion 150 moves toward the first end 111 of the first pipe portion 110, and the adapter 100 enters a second closed state in which the second valve body 152 of the valve body portion 150 contacts the second valve seat 1133.

[0036] Therefore, in this embodiment, when the adapter 100 is attached to the tank 300, if the hose 200 is pulled toward the first end 111 of the first pipe section 110, gas from the tank 300 will not flow into the joint section 130 or the hose 200. As a result, even if the joint section 130 or the hose 200 is damaged by the pulling of the hose 200, it is possible to prevent gas from the tank 300 from leaking out to the outside.

[0037] In the second closed state, the length of the first spring 160 is a fifth length L5 (L5 > L1) which is shorter than its natural length, and the length of the second spring 170 is a sixth length L6 (L6 > L2) which is shorter than its natural length. It is preferable that the restoring force of the second spring 170 be greater than the restoring force of the first spring 160. By doing so, in the second closed state, the force acting on the valve body 150 in the direction of the first end 111 of the first pipe 110 becomes positive, and this force presses the second valve body 152 against the second valve seat 1133, maintaining the state in which the second valve body 152 is in contact with the second valve seat 1133.

[0038] The second valve body 152 may further include a sealing member 1521. The sealing member 1521 is positioned to contact the second valve seat 1133 when the second valve body 152 of the valve body portion 150 contacts the second valve seat 1133. This ensures a more reliable seal between the valve body portion 150 and the first pipe portion 110. For example, a groove 1522 may be formed in the second valve body 152, and the sealing member 1521 may be fitted into this groove 1522. The sealing member 1521 may be, for example, an O-ring made of an elastic material.

[0039] The joint portion 130 is preferably provided with a central portion 137 between the first end portion 131 and the second end portion 132, the central portion having an outer diameter larger than the outer diameters of both the first end portion 131 and the second end portion 132. Furthermore, the inner diameter of the central portion 113 of the first pipe section 110 is made smaller than the inner diameter of the first end portion 111, the outer diameter of the second end portion 132 of the joint portion 130 is made smaller than the inner diameter of the central portion 113 of the first pipe section 110, and the outer diameter of the central portion 137 of the joint portion 130 is made larger than the inner diameter of the central portion 113 of the first pipe section 110 and smaller than the inner diameter of the first end portion 111 of the first pipe section 110, as shown in Figures 1, 2, and 7, such that the second end portion 132 of the joint portion 130 is inserted into the central portion 113 of the first pipe section 110 and the central portion 137 of the joint portion 130 is inserted into the first end portion 111 of the first pipe section 110. Furthermore, the adapter 100 is preferably provided with an end nut 180. The end nut 180 has a first end 181 and a second end 182. The first end 181 covers the outer circumferential surface of the first end 131 of the joint 130, and the second end 182 is fixed to the outer circumferential surface of the first end 111 of the first pipe 110. The inner diameter of the inner circumferential surface of the first end 181 is smaller than the outer diameter of the central part 137 of the joint 130. This configuration restricts the movement of the joint 130 in the X direction. As a result, it is possible to prevent the joint 130 from coming out of the first pipe 110 when the hose 200 is pulled. For example, a male thread may be formed on the inner circumferential surface of the second end 182 of the end nut 180, and a female thread may be formed on the outer circumferential surface of the first end 111 of the first pipe section 110. The second end 182 of the end nut 180 can be fixed to the first end 111 of the first pipe section 110 by screwing the male and female threads together.

[0040] The outer surface of the joint 130 may be marked with a second mark to indicate that the space between the valve body 150 and the first pipe 110 is sealed. The second mark should be placed on the outer surface of the joint 130 in a location that is not exposed to the outside when the second valve body 152 is not in contact with the second valve seat 1133 (i.e., inside the end nut 180), but is exposed to the outside when the first valve body 151 is in contact with the first valve seat 1132.

[0041] The present invention has been described above with reference to preferred embodiments. Although the present invention has been described with reference to specific examples, various modifications and changes can be made to these examples without departing from the spirit and scope of the invention as described in the claims. [Explanation of Symbols]

[0042] 100 adapter 110 First pipe section 111 First end of the first pipe section 110 112 Second end of the first pipe section 110 1121 Sealing member 1122 Groove 1123 Recess 113 Central part of the first pipe section 110 1131 Protrusion 1132 First Ordeal 1133 Second Ordeal 120 Connection section 121 Handle 130 Joint section 131 First end of joint 130 1311 Hose fixing part 132 Second end of joint 130 133 Displacement prevention member 134 The first groove 135 sealing member 136 The second trench 137 Central part of joint section 130 140 Second pipe section 141 First end of second pipe section 141 1411 Protrusion 1412 Groove 142 Second end of second pipe section 141 150 Valve body 151 First valve body 1511 Sealing member 1512 Groove 152 Second valve body 1521 Sealing component 1522 Groove 153 Connection part 160 First spring 170 Second spring 180 End Nut 181 First end of end nut 180 182 The second end of end nut 180

Claims

1. An adapter for connecting a hose to a tank, The adapter comprises a first pipe section, a joint section, a second pipe section, a valve body section, a first spring, and a second spring. The first end of the joint is fixed to the hose. The second end of the joint is inserted into the first end of the first pipe section. The first end of the second pipe section is inserted into the second end of the first pipe section. The valve body portion is It is movably arranged inside the first pipe section, It has a first valve body, a second valve body, and a connecting part. The first valve body is positioned on the first end side of the first pipe section. The second valve body is positioned on the second end side of the first pipe section. The aforementioned connecting portion connects the first valve body and the second valve body, The first tubular portion has a projection that protrudes inward, The aforementioned protrusion is positioned between the first valve body and the second valve body. The inner diameter of the protrusion is smaller than the outer diameter of the first valve body and the outer diameter of the second valve body. The first spring is positioned inside the first pipe portion, between the second end of the joint portion and the first valve body, so as to be in contact with the second end of the joint portion and the first valve body. The adapter is provided with the second spring positioned inside the first tube so as to be in contact with the first end of the second tube and the second valve body, between the first end of the second tube and the second valve body.

2. The adapter according to claim 1, wherein the adapter is attached to the tank, and when the relative position of the joint portion with respect to the first pipe portion is in its initial position, the adapter is in an open state in which the first valve body is not in contact with the protrusion and the second valve body is not in contact with the protrusion.

3. The adapter according to claim 2, wherein in the open state, the first spring and the second spring are shorter than their natural length.

4. The adapter according to any one of claims 1 to 3, wherein when the adapter is removed from the tank, the adapter is in a first closed state in which the first valve body is in contact with the protrusion.

5. The adapter according to claim 4, wherein in the first closed state, the first spring and the second spring are shorter than their natural lengths, and the restoring force of the first spring is greater than the restoring force of the second spring.

6. The adapter according to claim 4, wherein a first mark is made on the outer surface of the second pipe portion at a location that is not exposed to the outside when the first valve body is not in contact with the protrusion, and is exposed to the outside when the first valve body is in contact with the protrusion.

7. The adapter according to claim 4, wherein, when the adapter is attached to the tank, when the relative position of the joint with respect to the first pipe portion moves from the initial position by a distance of a first distance or more toward the first end of the first pipe portion, the adapter is in a second closed state in which the second valve body contacts the protruding portion.

8. The adapter according to claim 7, wherein in the second closed state, the first spring and the second spring are shorter than their natural lengths, and the restoring force of the second spring is greater than the restoring force of the first spring.

9. The adapter according to claim 7, wherein a second mark is made on the outer surface of the joint portion at a location that is not exposed to the outside when the second valve body is not in contact with the protrusion, and is exposed to the outside when the second valve body is in contact with the first valve seat.

10. The aforementioned tank is a high-pressure tank for liquefied petroleum gas. The adapter according to any one of claims 1 to 3, wherein the hose is a high-pressure hose for carrying gas from the high-pressure tank.

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