JP2012077894A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which permits the number of piping components to be reduced using a simple configuration.SOLUTION: The check valve, in a coupling section for coupling an end portion of a larger-diameter side pipe 13 and an end portion of a smaller-diameter side pipe 12 through mutual superposition, includes a seal member housing 12c provided in the smaller-diameter side pipe to mount a seal member 14 for sealing between the two pipes, and protruding toward the center section of the smaller-diameter side pipe over an entirety of the inner circumferential face; and a valve element 1 for controlling a flow of fluid between the larger-diameter side pipe and the smaller-diameter side pipe. The valve element makes the inside of the larger-diameter side pipe and the inside of the smaller-diameter side pipe communicate with each other, and includes a slide section 1c that slides along the protrusion of the seal member housing, a blocking member 1a, 2 to disable the communication between the inside of the larger-diameter side pipe and the inside of the smaller-diameter side pipe when the seal member housing abuts against one end of the slide section, and a stopper section 1d to space the blocking member from the seal member housing and enable the insides of the two pipes to communicate with each other via the slide section, when one end of the slide section abuts against the seal member housing.

Description

  The present invention relates to a check valve used in a refrigeration cycle used for a car air conditioner or the like.

  Conventionally, in the refrigeration cycle or the like, a check valve is used to control the flow direction of fluid. As an example, Patent Document 1 discloses that a valve body having a valve chamber communicating with both holes between an inflow hole and an outflow hole, a valve body disposed in the valve chamber of the valve body, and the valve body There has been proposed a check valve that includes a valve body stopper that prevents the movement of the valve body and a stopper support ring that locks and fixes the valve body stopper, and the valve body is formed of an aluminum alloy. This check valve can be reduced in weight as a whole, can improve the fluid flow resistance of the valve stopper, and can be easily mounted.

The conventional check valve described in the above publication is incorporated as a single part into a pipe or the like. However, in order to reduce the number of parts of the pipe, Patent Document 2 discloses a check valve in a joint of the pipe. The structure which accommodated is described. In this configuration, a flange portion formed on the valve seat portion side of the check valve is sandwiched between the opposing end surfaces of the upstream and downstream joint pipes, and an elastic seal member integrally fixed to the flange portion is appropriately provided. The amount is compressed to ensure sealability and prevent water leakage.
JP-A-11-210906 Japanese Utility Model Publication No. 6-12879

  However, even in the configuration having the check valve in the joint described in Patent Document 2, the entire structure including the structure for ensuring the sealing performance is complicated and the number of parts is large, so there is room for improvement.

  Therefore, the present invention has been made in view of the problems in the above-described conventional check valve, and an object thereof is to provide a check valve capable of reducing the number of parts of piping with a simple configuration. To do.

  In order to achieve the above-mentioned object, the present invention is provided in the small-diameter side pipe at a connecting portion for connecting the end portion of the large-diameter side pipe and the end portion of the small-diameter side pipe so as to overlap each other. A seal member that seals between the seal member housing portion and the seal member housing portion projecting over the entire inner peripheral surface toward the center of the small-diameter-side pipe; Check valve having a valve body that controls the flow of fluid between the side pipe and the small diameter side pipe, the valve body being capable of communicating with each other inside the large diameter side pipe and the small diameter side pipe. However, the sliding portion that slides along the protruding portion of the seal member accommodating portion, and the large diameter side pipe and the small diameter provided at one end of the sliding portion and in contact with the seal member accommodating portion. Provided at the other end of the sliding portion and the sliding portion that prevents communication with the inside of the side piping, A stopper portion that separates the closing portion from the seal member accommodating portion when it contacts the seal member accommodating portion, and allows the inside of the large diameter side pipe and the small diameter side tube to communicate with each other via the sliding portion. It is characterized by providing.

  According to the present invention, since the check valve is configured by using the seal member housing portion formed in the small diameter side pipe as the valve seat in the connection portion between the end of the large diameter side pipe and the small diameter side pipe, the connection structure A check valve that also serves as a valve can be realized with a simple configuration, and the number of piping parts can be reduced.

  In the check valve, the valve body includes a pressure receiving portion that receives fluid pressure, a groove portion adjacent to the pressure receiving portion, a plurality of projecting pieces extending from the groove portion to the opposite side of the pressure receiving portion, A claw portion bent outward at the tip of each of the projecting pieces, a second seal member is accommodated in the groove portion, and the second seal member and the pressure receiving portion define the closing portion as the plurality of projections. The sliding portion can be constituted by a piece, and the stopper portion can be constituted by the claw portion.

  As described above, according to the present invention, it is possible to provide a check valve that can reduce the number of parts of piping with a simple configuration.

It is a figure which shows the valve body and packing of the non-return valve concerning this invention, Comprising: (a) is a left view, (b) is a partially broken front view, (c) is a right view. It is a figure which shows the non-return valve concerning this invention, Comprising: (a) is sectional drawing which shows the state which a fluid can move, (b) is sectional drawing which shows the state in which movement of the fluid is controlled, (c) is It is the schematic for demonstrating the point which attaches a valve body to a pipe. It is a figure which shows the general connection structure of piping, (a) is a partial cross section figure of a hexagon nut, (b) is a partial cross section figure of a pipe, (c) is a partial cross section of connection parts, such as an apparatus. FIG. 4D is an assembly sectional view.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  Before explaining the check valve according to the present invention, a general connection structure (joint part) of piping such as a refrigeration cycle used in a car air conditioner will be described with reference to FIG.

  When the pipe 12 forming the refrigerant passage is connected to equipment such as a compressor constituting the refrigeration cycle, the end of the pipe 12a having a uniform diameter and thickness is bent to connect the equipment-side connecting portion 13. A sealing member accommodating portion 12c for mounting a packing 14 such as an O-ring is formed in the insertion portion 12b, and a flange portion 12d having a diameter larger than that of the tube 12a is formed.

  And using the said pipe 12, the right end part of the pipe 12 is inserted in the inside 13b of the connection part 13 on the equipment side such as a compressor, and the opening part 11b of the hexagon nut 11 is inserted through the pipe 12a of the pipe 12. Then, the entire hex nut 11 is moved from the left end portion of the pipe 12 to the right end portion side of the pipe 12, and the internal thread portion 11a of the hex nut 11 is screwed into the external thread portion 13a of the connection portion 13 so that the state shown in FIG. The pipe 12 and the connection part 13 on the apparatus side are connected. With this connection structure, the pipe 12 and the connection part 13 on the apparatus side are connected in a state where the joint part is sealed with the packing 14, and the fluid F flows in the direction of the arrow.

  Next, an embodiment of a check valve according to the present invention will be described with reference to FIGS.

  FIG. 1 shows a valve body 1 of a check valve according to the present invention and a packing 2 as a seal member. The valve body 1 is formed of a resin such as nylon or PPS, and is a circle as a pressure receiving portion that receives fluid pressure. A plate-like portion 1a, a groove portion 1b formed on the left side of the disk-like portion 1a, four protruding pieces 1c extending leftward from the groove portion 1b, and bent outward at the tip of each protruding piece 1c Claw portion 1d. The packing 2 is an O-ring, resin packing, or the like, and is attached to the groove 1b of the valve body 1.

  The check valve according to the present invention is configured by combining the valve body 1 and the packing 2 and the hexagon nuts 11 to 13 shown in FIG.

  As shown in FIGS. 2A and 2B, the check valve 10 is configured so that the protruding piece 1 c of the valve body 1 comes into contact with the seal member housing portion 12 c of the pipe (small diameter side pipe) 12. The entire packing 2 is accommodated inside the right end of the pipe 12. When the valve body 1 is accommodated in the right end portion of the pipe 12, as shown in FIG. 2 (c), the valve body 1 is inserted into the right end portion of the pipe 12 from the claw portion 1d side, and the valve body 1 is gradually left. The claw portion 1d of the valve body 1 slides on the seal member accommodating portion 12c of the pipe 12, and finally the claw portion 1d gets over the seal member accommodating portion 12c. It is installed so that it cannot be removed from the inside.

  Thereafter, as described with reference to FIG. 3, the right end portion of the pipe 12 is inserted into the inside 13 b of the device-side connection portion (large-diameter side pipe) 13, and the female screw portion 11 a of the hexagon nut 11 is connected to the male screw portion 13 a of the connection portion 13. And are connected to the state shown in FIGS. 2 (a) and 2 (b). Thereby, the check valve 10 also serving as a connection structure (joint portion) is configured.

  Next, the operation of the check valve 10 having the above configuration will be described with reference to FIG.

  When the fluid F flows from the pipe 12 to the connecting portion 13, the entire valve body 1 moves to the right according to the flow of the fluid F, and the claw portion 1 d of the valve body 1 functions as a stopper so that the seal member housing portion 12 c Abutting on the left end, the movement of the entire valve body 1 stops. In this state, as indicated by the arrow, the fluid F from the pipe 12 passes between the four projecting pieces 1 c of the valve body 1, flows rightward, and flows into the connection portion 13.

  On the other hand, when the fluid F tries to move from the connecting portion 13 to the pipe 12, the entire valve body 1 moves to the left according to the flow of the fluid F and is attached to the valve body 1 as shown in FIG. The packing 2 comes into contact with the right end portion of the seal member accommodating portion 12c, and the movement of the entire valve body 1 is stopped. In this state, as indicated by the arrow, the fluid F from the connecting portion 13 is prevented from moving by the disc-like portion 1a and the packing 2 of the valve body 1, and thus the flow into the pipe 12 is restricted.

  As described above, according to the present invention, a check valve that also serves as a pipe connection structure (joint portion) is configured by causing the seal member housing portion 12c of the pipe 12 to function as the valve seat of the valve body 1, thereby simplifying the structure. With a simple configuration, the number of piping parts has been reduced.

  In the above embodiment, the four protruding pieces 1c of the valve body 1 slide on the seal member accommodating portion 12c of the pipe 12. However, the number of protruding pieces 1c is not limited to four, and may be plural. The same function can be demonstrated.

  Further, the sliding of the seal member accommodating portion 12c is not limited to the protruding piece 1c, but is a sliding member that communicates the inside of the pipe 12 and the connecting portion 13 when the packing 2 is separated from the seal member accommodating portion 12c. Anything is enough.

  Further, the packing 2 is provided in the groove portion 1b of the valve body 1 and brought into contact with the seal member accommodating portion 12c so that the inside of the pipe 12 and the connection portion 13 cannot be communicated. The inside of the pipe 12 and the connecting portion 13 cannot be directly communicated between the valve body 1 and the seal member accommodating portion 12c without providing the seal member on the seal member accommodating portion 12c side or without providing the seal member. You can also.

  Further, the end portion of the pipe 12 is bent to form the seal member accommodating portion 12c and the flange portion 12d. However, the present invention can be applied even when these are formed by cutting.

1 Valve body 1a Disk-shaped part (pressure receiving part)
1b Groove 1c Protruding piece 1d Claw 2 Packing 10 Check valve 11 Hexagonal nut 11a Female threaded part 11b Opening part 12 Pipe 12a Pipe 12b Insertion part 12c Seal member accommodating part 12d Hook part 13 Connection part 13a Male thread part 13b Internal 14 Packing

Claims (2)

At the connecting portion for connecting the end portion of the large-diameter side pipe and the end portion of the small-diameter side pipe so as to overlap each other, a seal member provided on the small-diameter side pipe and sealing between the two pipes is mounted. A seal member accommodating portion that projects over the entire inner peripheral surface toward the center of the small-diameter side pipe;
A check valve comprising a valve body that controls the flow of fluid between the large-diameter side pipe and the small-diameter side pipe in cooperation with the seal member housing portion,
The valve body
A sliding portion that slides along the protruding portion of the seal member accommodating portion while allowing the inside of the large diameter side pipe and the small diameter side piping to communicate with each other;
A closing portion that is provided at one end of the sliding portion and prevents communication between the large-diameter-side pipe and the small-diameter-side pipe when contacted with the seal member housing portion;
Provided at the other end of the sliding portion, when contacting the seal member accommodating portion, the closing portion is separated from the seal member accommodating portion, and the large diameter side pipe and the small diameter are interposed via the sliding portion. A check valve comprising a stopper portion that allows the insides of the side pipes to communicate with each other. The valve body includes a pressure receiving portion that receives a fluid pressure, a groove portion adjacent to the pressure receiving portion, a plurality of protruding pieces extending from the groove portion to the opposite side of the pressure receiving portion, and tips of the protruding pieces. And a claw portion bent outward, and the second seal member is accommodated in the groove portion,
The said 2nd sealing member and the said pressure receiving part comprise the said obstruction | occlusion part, the said sliding part is comprised by these several protrusion pieces, and the said stopper part is comprised by the said nail | claw part, respectively. Check valve.

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