JP2011241846A - Three-way switch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-way switch valve allowing miniaturization and maintaining of a stable operation at a low manufacturing cost.SOLUTION: This three-way switch valve 1 selectively flows out either one of fluid flowing in first inflow piping 13 and second inflow piping 14 to outflow piping 15. The three-way switch valve 1 includes a valve body 3 including a first valve chamber 3a communicated with the first inflow piping 13 and a second valve chamber 3b communicated with the second inflow piping 13, a valve seat member 7 fixed in the valve body 3 and including a first communication path 7a to communicate the first valve chamber 3a with the outflow piping 15 and a second communication path 7b to communicate the second valve chamber 3b with the outflow piping 15, a first valve element 5 arranged in the first valve chamber 3a to open/close a first valve port 7c by an operation of an electromagnetic actuator, a piston 8 arranged in the second valve chamber 3b, which holds the second valve element 10 for opening/closing a second valve port 7d and reciprocates toward the second communication path 7b, and a working rod 12 interposed between the first valve element 5 and the second valve element 10 and having an intermediate part guided by the valve seat member 7. The first inflow piping 13, the second inflow piping 14 and the outflow piping 15 are not overlapped with each other from the viewpoint of moving directions of both of the valve elements 5 and 10.

Description

  The present invention relates to a three-way switching valve used for switching a fluid flow path in a heat pump unit or the like of a vending machine.

  Conventionally, as the three-way switching valve, for example, in Patent Document 1, as shown in FIG. 3, a valve body 51, first and second inflow pipes 52, 53 arranged in two upper and lower stages, and an outflow pipe 54 are provided. A coil device 60, a plunger 61, two valve bodies 63 and 65, two pilot valve bodies 62 and 66, and a drive pin 69 having these pilot valve bodies 62 and 66 at both ends. An electromagnetic solenoid type three-way switching valve 50 is described.

  According to the three-way switching valve 50, the plunger 61 is moved in the vertical direction by energization / non-energization of the coil device 60, and the two piston chambers 63a, 65a are opened and closed by the pilot valve bodies 62, 66. The valve bodies 63 and 65 are brought into contact with and separated from the valve seats 57 and 58, and either one of the fluid flowing into the first and second inflow pipes 52 and 53 is selectively flowed out to the outflow pipe 54.

Japanese Patent Laid-Open No. 5-180369

  However, in the three-way switching valve 50, since the first and second inflow pipes 52 and 53 are arranged in two stages in the vertical direction, the drive pin 69 needs to be formed long, leading to an increase in manufacturing cost. In addition, there is a problem that the entire three-way switching valve 50 becomes large. Further, since there are gaps between the drive pin 69 and the valve body 63 and the valve body 65, and between the valve body 63 and the valve body 65 and the valve body 51, the drive pin 69 is inclined and rattles. There is a possibility that the stable operation of the three-way switching valve 50 may be hindered.

  Therefore, the present invention has been made in view of the problems in the above-described conventional technology, and provides a three-way switching valve that is low in manufacturing cost, can be downsized, and can maintain stable operation. With the goal.

  In order to achieve the above object, the present invention is a three-way switching valve for selectively flowing out one of the fluids flowing into the first and second inflow pipes to the outflow pipe, and communicates with the first inflow pipe. A valve main body having a first valve chamber and a second valve chamber communicating with the second inflow pipe, and a first communication path fixed inside the valve main body and communicating the first valve chamber with the outflow pipe A valve seat member having a second communication passage communicating the second valve chamber with the outflow pipe, and opening and closing the valve opening of the first communication passage by the operation of an electromagnetic actuator. A first valve body that is disposed in the second valve chamber, a piston that holds the second valve body that opens and closes the valve port of the second communication path, and that reciprocates toward the second communication path; It is interposed between the first valve body and the second valve body, and an intermediate portion is formed on the valve seat member. And a inner to the actuating rod, wherein the first and second inlet pipe and said outlet pipe, and wherein the non-overlapping as viewed from a moving direction of the first and second valve body.

  And according to this invention, in order to arrange | position the 1st and 2nd inflow piping and outflow piping so that it may not mutually overlap seeing from the moving direction of a 1st and 2nd valve body, an operating rod is formed short. The manufacturing cost can be kept low, and the vertical direction of the three-way switching valve can be reduced in size. In addition, since the operating rod is guided by the valve seat member fixed to the valve body, the operating rod does not rattle and the stable operation of the three-way switching valve can be maintained. In addition, as a structure which can make the whole three-way switching valve the smallest, the first and second inflow pipes and the outflow pipes are arranged in the same plane perpendicular to the moving direction of the first and second valve bodies (first and second In the case where the moving direction of the second valve body is the vertical direction, it is a case where the second valve body is disposed in the same horizontal plane).

  As described above, according to the present invention, it is possible to provide a three-way switching valve that is low in manufacturing cost, small in size, and capable of maintaining stable operation.

BRIEF DESCRIPTION OF THE DRAWINGS One Embodiment of the three-way selector valve concerning this invention is shown, (a) is front sectional drawing, (b) is side sectional drawing, (c) is a partially expanded sectional view of (a). It is a whole perspective view of the three-way selector valve of FIG. It is sectional drawing which shows an example of the conventional three-way switching valve.

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

  1 and 2 show an embodiment of a three-way switching valve according to the present invention, and the three-way switching valve 1 selects either one of the fluids flowing into the first inflow pipe 13 and the second inflow pipe 14. A coil device 2, a valve body (casing) 3 partially fitted in the coil device 2, a plunger 4 provided at the upper part in the valve body 3, A valve seat member 7 fixed in the valve body 3, a ball-shaped first valve body 5 fixed to the lower end portion of the plunger 4, and a ball-shaped second valve body 10 fixed to the upper end portion of the piston 8. And an operating rod 12 that is interposed between the first valve body 5 and the second valve body 10, penetrates the valve seat member 7, and a piston 8 disposed at the lower part in the valve body 3. Prepare.

  The 1st and 2nd inflow piping 13 and 14 and the outflow piping 15 are joined to the valve body 3 by brazing in a furnace using bronze etc. (brazing part 16).

  The valve body 3 is formed in a cylindrical shape, and includes a plunger 4, a valve seat member 7, an operating rod 12, a piston 8 and the like inside. A suction element 17 is fixed to the upper end portion of the valve body 3, and the lower end portion is closed by a lower lid 9. A first valve chamber 3 a is formed between the plunger 4 and the upper surface of the valve seat member 7, and a second valve chamber 3 b is formed between the lower surface of the valve seat member 7 and the upper surface of the piston 8.

  The first valve body 5 is fixed to the lower end of the plunger 4 by caulking, and is urged downward by a first coil spring 6 interposed between the plunger 4 and the suction element 17 of the coil device 2.

  The valve seat member 7 includes a first communication path 7a that communicates the first valve chamber 3a with the outflow pipe 15, and a second communication path 7b that communicates the second valve chamber 3b with the outflow pipe 15. The first valve port 7c opens on the chamber 3a side, and the second valve port 7d opens on the second valve chamber 3b side. Further, a guide portion 7 e for guiding the intermediate portion of the operating rod 12 is formed between the first communication passage 7 a and the second communication passage 7 b of the valve seat member 7.

  The piston 8 has a second valve body 10 fixed to the upper end thereof by caulking, and is biased upward by a second coil spring 11 interposed between the piston 8 and the lower lid 9. In addition, a plurality of flow holes (not shown) communicating with the piston inner chamber 8a in the piston 8 are provided, whereby pressure is also applied from the inside of the piston 8 to equalize the pressure inside and outside, and resistance during sliding. Reduce. The spring load of the second coil spring 11 is set smaller than that of the first coil spring 6 on the plunger 4 side. This is because when the coil device 2 is not energized, the elastic force of the first coil spring 6 on the plunger 4 side is transmitted to the piston 8 via the operating rod 12, and the piston 8 is pushed down to open the second valve port 7d. It is for opening.

  The operating rod 12 is moved between the plunger 4 and the piston 8 to move the piston 8 following the displacement of the first valve body 5, and an intermediate portion thereof is guided by the guide portion 7 e of the valve seat member 7. Is done.

  Next, the operation of the three-way switching valve 1 having the above configuration will be described with reference to the drawings.

  In a state where the coil device 2 is not energized, as shown in FIG. 1, the plunger 4 is urged downward by the first coil spring 6 and slides downward in the valve body 3, and the first valve body 5 causes the first to move. The valve port 7c is closed. As the plunger 4 slides, the operating rod 12 moves downward to move the second valve body 10 and the piston 8 downward, and the second valve body 10 is moved away from the second valve port 7d. Open 2 valve port 7d. As a result, the fluid flowing in from the second inflow pipe 14 passes through the second valve chamber 3b, the second valve port 7d, and the second communication path 7b in this order and flows out to the outflow pipe 15.

  On the other hand, when the coil device 2 is energized, the plunger 4 is attracted to the attractor 17 by the magnetic force and slides upward in the valve main body 3, and the first valve body 5 is separated from the first valve port 7 c to move the first valve. Open mouth 7c. Further, as the first valve body 5 moves due to the sliding of the plunger 4, the force that pushes down the second valve body 10 and the piston 8 by the operating rod 12 does not act, and the elastic force of the second coil spring 11 causes the piston to move. 8 slides upward, and the second valve body 7 closes the second valve port 7d. As a result, the fluid flowing in from the first inflow pipe 13 passes through the first valve chamber 3a, the first valve port 7c, and the first communication path 7a in this order and flows out to the outflow pipe 15.

  As described above, the three-way switching valve 1 having the above-described configuration moves the first and second inflow pipes 13 and 14 and the outflow pipe 15 from the vertical direction (the moving direction of the first valve body 5 and the second valve body 10). Since it arrange | positions so that it may not overlap in view, the action | operation rod 12 can be formed short, manufacturing cost can be restrained low, and the three-way switching valve 1 whole can be reduced in size. In addition to this, since the operating rod 12 is guided by the guide portion 7e of the valve seat member 7 fixed to the valve body 3, the operating rod 12 does not rattle and the stable operation of the three-way switching valve 1 is maintained. Can do.

  In the above-described embodiment, the electromagnetic solenoid is used as the electromagnetic actuator, and the first valve body 5 is provided on the plunger 4 that is a component thereof, so that the three-way switching valve 1 is realized by an electromagnetic valve. By adopting an electric motor as the electromagnetic actuator, the three-way switching valve 1 can be realized by an electric motor system.

DESCRIPTION OF SYMBOLS 1 Three-way switching valve 2 Coil apparatus 3 Valve main body 3a 1st valve chamber 3b 2nd valve chamber 4 Plunger 5 1st valve body 6 1st coil spring 7 Valve seat member 7a 1st communicating path 7b 2nd communicating path 7c 1st valve Port 7d Second valve port 7e Guide portion 8 Piston 8a Piston inner chamber 9 Lower lid 10 Second valve body 11 Second coil spring 12 Actuating bar 13 First inflow piping 14 Outflow piping 16 Outflow piping 16 Brazing portion 17 Suction Child

Claims (2)

A three-way switching valve that selectively causes one of the fluids flowing into the first and second inflow pipes to flow out to the outflow pipes,
A valve body having a first valve chamber communicating with the first inflow piping and a second valve chamber communicating with the second inflow piping;
A valve seat member fixed inside the valve body and having a first communication passage communicating the first valve chamber with the outflow piping and a second communication passage communicating the second valve chamber with the outflow piping; ,
A first valve body that is disposed in the first valve chamber and opens and closes the valve port of the first communication path by operation of an electromagnetic actuator;
A piston that is disposed in the second valve chamber, holds a second valve body that opens and closes a valve port of the second communication path, and reciprocates toward the second communication path;
An operation rod interposed between the first valve body and the second valve body, the intermediate portion being guided by the valve seat member;
The three-way switching valve, wherein the first and second inflow pipes and the outflow pipe do not overlap each other when viewed from the moving direction of the first and second valve bodies.   The three-way switching according to claim 1, wherein the first and second inflow pipes and the outflow pipe are arranged in the same plane perpendicular to the moving direction of the first and second valve bodies. valve.

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