JP5442213B2 - 3-way selector valve - Google Patents

Description

  The present invention relates to a three-way switching valve, and more particularly to a three-way switching valve used in a refrigeration cycle of an air conditioner.

  Conventionally, three-way switching valves have been widely used for flow control of refrigerant in air-conditioning equipment and flow control of combustion gas, air, hot water, liquid fuel, etc. in baths and showers.

  FIG. 6 shows an example of a conventional three-way switching valve. The three-way switching valve 50 is of an electromagnetic solenoid type, and includes a coil device 51, a first casing 52 fitted in the coil device 51, and a first casing 52. The plunger 53 provided in the casing 52, the ball-shaped first valve body 54 and the coil spring 55, the valve body 56, and the internal space of the valve body 56 are partitioned into a first valve chamber 56a and a second valve chamber 56b. A valve casing 69, a second casing 57 that is partially fitted and connected to the valve main body 56, a piston 58 provided in the second casing 57, a lower lid 59, a ball-shaped second valve body 60, and a coil. A spring 61, an operating rod 62 interposed between the plunger 53 and the piston 58, penetrating the valve body 56, an inflow pipe 63 having a flow path communicating with the first communication passage 69a of the valve seat 69, and a valve Second communication passage 6 of the seat 69 b first outlet pipe having a flow passage communicating with a (not shown), and a second outlet pipe 64 or the like having a flow path communicating with the third communication passage 69c of the valve seat 69. The spring load of the coil spring 55 is set larger than that of the coil spring 61.

  The first casing 52, the second casing 57, the inflow pipe 63, the second outflow pipe 64, and the like are each welded to the valve body 56 by brazing (brazing portions 65 and 66), and are brazed in a total of five places.

Moreover, the 1st valve body 54 of the said three-way switching valve 50 is accommodated in the recessed part 53a of the plunger 53, as shown to Fig.7 (a), and is fixed by caulking. Further, a pressure equalizing hole 53b is formed in the bottom surface of the concave portion 53a of the plunger 53. The pressure equalizing hole 53b is formed in the sealed space 67 formed by the recess 53a and the first valve body 54, as shown in FIGS. 7B to 7D, when the pressure equalizing hole 53b does not exist. This is to prevent the high pressure fluid such as CO ₂ that has invaded from expanding after being vaporized and applying a high pressure P to the first valve body 54 to drop off from the plunger 53. Note that a pressure equalizing hole 58b is also formed in the piston 58 shown in FIG. 6 for the same reason.

  Next, the operation of the three-way selector valve 50 having the above configuration will be described with reference to FIG. When the coil device 51 is not energized, the plunger 53 slides in the first casing 52 in the direction of the first valve port 69d by the coil spring 55 as shown in FIG. The valve port 69d is closed. As the plunger 53 slides, the operating rod 62 moves downward to slide the piston 58 away from the second valve port 69e, and the second valve body 60 moves away from the second valve port 69e. The second valve port 69e is opened. As a result, the fluid flowing in from the inflow pipe 63 passes through the first communication passage 69a of the valve body 56 and flows out from the first outflow pipe 64 through the second valve port 69e.

  On the other hand, when the coil device 51 is energized, the plunger 53 is attracted to the attractor 70 by the magnetic force and slides upward in the first casing 52, and the first valve body 54 is separated from the first valve port 69d. Open the first valve port 69d. Along with the sliding of the plunger 53, the force to push down the piston 58 by the operating rod 62 does not act, the piston 58 moves upward by the elastic force of the coil spring 61, and the second valve body 60 moves the second valve port 69 e. close up. As a result, the fluid that has flowed in from the inflow pipe 63 passes through the first communication passage 69a of the valve body 56, and extends vertically to the second outflow pipe (not shown) via the first valve port 69d. ).

  However, in the conventional three-way selector valve 50, when the valve body 56 and the two casings 52 and 57 are brazed in a tilted state, the plunger 53 and the piston 58 are also tilted. Further, when the casings 52 and 57 are brazed to the valve body 56 in a state where the cores are displaced, the plunger 53 and the piston 58 are also displaced. When the three-way switching valve 50 is operated in such a state, the plunger 53 and the piston 58 are interlocked via the operation rod 62, so that the plunger 53 and the piston 58 come into contact with the inner walls of both the casings 52 and 57, and the plunger 53 and the piston 58 are remarkably worn and foreign matter is generated in the valve main body 56, which may hinder stable operation of the three-way switching valve 50.

  Further, since the valve body 56 and the two casings 52 and 57 are welded by brazing, both the casings 52 and 57 must be molded by different molds, and after molding, each of them is brazed to the valve body 56. Therefore, there is a problem that the manufacturing cost increases.

  Further, as shown in FIG. 7, in order to prevent the first valve body 54 from dropping off due to the pressure P of the gas that has entered the recessed portion 53a of the plunger 53 and the sealed space 67 of the first valve body 54, the pressure equalizing hole 53b. , 58b had to be provided, which was one of the factors that increased the manufacturing cost.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and an object thereof is to provide a three-way switching valve that operates stably at a low cost.

To achieve the above object, the three-way selector valve of the present invention, a plunger coil arrangement is operated in a single straight tubular casing to be fitted by the excitation to said coil apparatus is built slidably an electromagnetic solenoid type, attractor for the plunger to one end of the front mute pacing is, the other end is secured lid body, before dumb pacing, an inlet pipe through which fluid flows, A valve seat member that connects a first outflow pipe and a second outflow pipe through which the fluid selectively flows out and divides an internal space into a first valve chamber and a second valve chamber is disposed, The seat member includes a first communication passage that allows the inflow piping to communicate with the two valve chambers, a second communication passage that allows the first valve chamber to communicate with the first outflow piping, and the second valve chamber to the second position. A third communication passage communicating with the outflow pipe, and the first valve chamber The first valve body for opening and closing the valve port of the second communication path is provided integrally with the plunger, and the second valve body for opening and closing the valve port of the third communication path is provided in the second valve chamber. A plurality of actuating rods that slidably penetrate the valve seat member and are interposed between the holding portion of the first valve body and the piston; and The second valve body follows the displacement of the first valve body by interlocking means comprising an urging spring for urging the first valve body, and the valve seat member, the inflow pipe, the first 1 outlet pipe, said second outlet pipe is by furnace brazing technique, characterized in that it is brazed hermetically fixed to the joining fitting portion of each to the front listen pacing.

And according to the present invention, the casing that has been divided into two in the past is one straight tube , and the valve seat member is provided in the casing, so that the cost for molding the casing can be reduced, Since the brazed portion between the valve seat member and the casing can be reduced, the manufacturing cost can be reduced. Furthermore, in the past, the valve body and the two casings were connected by brazing while ensuring airtightness, whereas the three-way switching valve according to the present invention was installed in one casing. Since the valve seat member can be brazed in the casing by providing a member, it is not necessary to secure the airtightness by brazing between the casing and the valve seat member, and the airtightness is greatly improved than before. Can be made.

Further, in opening and closing the valve port of the second communication path by the operation of the electromagnetic actuator, with a plunger sliding in the casing in the axial direction comprises a first valve body to open and close the valve port of the third communication passage per the, even when a cylinder that slides in the casing axially provided with a second valve element, because the casing is constituted by a single one of the straight tube, the plunger and cylinder piece to the inner wall of the casing It is possible to prevent contact and wear and to maintain stable operation of the three-way switching valve.

  As described above, according to the present invention, a three-way switching valve that operates stably can be provided at low cost.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an embodiment of a three-way switching valve according to the present invention. The three-way switching valve 1 includes a coil device 2, a casing 3 partially fitted in the coil device 2, and a casing. A plunger 4, a ball-shaped first valve body 5 and a coil spring 6 provided in an upper part of the valve body 3, and a valve seat member 7 which divides the internal space of the casing 3 into a first valve chamber 7a and a second valve chamber 7b. The piston 8, the lower lid 9, the ball-shaped second valve body 10 and the coil spring 11, which are provided in the lower part of the casing 3, are interposed between the plunger 4 and the piston 8, and pass through the valve seat member 7. An operating pipe 12, an inflow pipe 13 having a flow path communicating with the first communication path 7c of the valve seat member 7, and a first outflow pipe 14 having a flow path communicating with the second communication path 7d of the valve seat member 7. The second outflow having a flow path communicating with the third communication passage 7e of the valve seat member 7 Constituted by the tube 15. The spring load of the coil spring 6 is set larger than that of the coil spring 11.

  The valve seat member 7 and the three pipes 13, 14, 15 arranged inside the casing 3 are connected to the casing 3, and the casing 3 and the valve seat member 7, and the casing 3 and the three pipes 13, 14 and 15 are joined by brazing in a furnace using bronze or the like (brazing portions 16 and 18), and brazed at a total of four points.

  The first valve body 5 is fixed to the lower end of the plunger 4 by caulking, and is urged downward by a coil spring 6 interposed between the plunger 4 and the suction element 19 of the coil device 2. Similarly, the piston 8 also has the second valve body 10 fixed to the upper end thereof by caulking, and is biased upward by a coil spring 11 interposed between the piston 8 and the lower lid 9.

  As shown in FIG. 4, the first valve body 5 of the three-way switching valve 1 is accommodated in the concave portion 4a of the plunger 4 and protrudes from the concave portion 4a. In this embodiment, three first valve bodies 5 are formed at regular intervals in the bottom view. By the caulking protrusions 4b, the recessed portions 4a are fixed so as not to generate a sealed space. Needless to say, the number of protruding pieces 4b is not limited to three. Moreover, although illustration is abbreviate | omitted, the same process is performed also about the piston 8 shown in FIG.

  The coil spring 6 is set to have a spring load larger than that of the coil spring 11. This is because when the coil device 2 is not energized, the elastic force of the coil spring 6 is transmitted to the piston 8 via the operating rod 12 to open the second valve port 7g.

  The operating rod 12 passes through the valve seat member 7 and is interposed between the plunger 4 and the piston 8 in a state where it is not fixed to any member, and transmits the elastic force of the coil spring 6 to the piston 8 to transmit the second valve. Provided to open the mouth 7g. As clearly shown in FIG. 1 (b), the two operating rods 12 are arranged at positions facing each other across the axis of the casing 3. It is also possible to arrange three or more.

  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 in which the coil device 2 is not energized, as shown in FIGS. 1 and 2, the plunger 4 is urged downward by the coil spring 6 and slides downward in the casing 3, and the first valve body 5 performs the first operation. The valve port 7f is closed. As the plunger 4 slides, the operating rod 12 moves downward to move the piston 8 downward, and the second valve element 10 is separated from the second valve opening 7g to open the second valve opening 7g. . As a result, the fluid flowing in from the inflow pipe 13 passes through the first communication passage 7c of the valve seat member 7 and flows out to the second outflow pipe 15 through the second valve port 7g.

  On the other hand, when the coil device 2 is energized, as shown in FIG. 3, the plunger 4 is attracted to the attractor 19 by the magnetic force and slides upward in the casing 3, and the first valve body 5 is moved from the first valve port 7f. The first valve port 7f is opened after being separated. Further, as the plunger 4 slides, the force for pushing down the piston 8 by the operating rod 12 does not act, the piston 8 slides upward by the elastic force of the coil spring 11, and the second valve body 10 causes the second valve to slide. Close mouth 7g. As a result, the fluid flowing in from the inflow pipe 13 passes through the first communication passage 7c of the valve seat member 7 and from the first outflow pipe 14 shown in FIGS. 1 (a) and 2 through the first valve port 7f. leak.

  In the three-way switching valve 1 having the configuration of the present invention, the plunger 4 of the first valve body 5 as the movable member and the piston 8 of the second valve body 10 are slidably fitted into the single casing 3. There is no misalignment of the movable member, and the following operation can be performed smoothly.

Further, as described above, the first valve body 5 (see FIG. 4) is accommodated in the concave portion 4a of the plunger 4, and is fixed by the caulking projection piece 4b so as not to generate a sealed space in the concave portion 4a. 4, even when a high-pressure fluid such as CO ₂ enters the concave portion 4 a, the gas can be released from a place where the caulking protruding piece 4 b is not formed, and the first valve body 5 is dropped from the plunger 4. It can also be prevented.

  When a relatively low-pressure fluid is handled instead of a high-pressure fluid, the first caulking piece 4b (see FIG. 4) or the pressure equalizing hole is not formed as shown in FIG. 5B. By providing the recess 4c so that the volume of the sealed space 17 formed by the valve body 5 and the recess 4a of the plunger 4 is reduced, the amount of fluid entering the sealed space 17 is reduced and the first valve body 5 is reduced. It is also possible to minimize the pressure applied to the first valve body 5 and prevent the first valve body 5 from falling off the plunger 4.

  In the present embodiment, when the three-way switching valve 1 according to the present invention is configured, an electromagnetic solenoid is used as an electromagnetic actuator, and the first valve body 5 is provided on the plunger 4 which is a constituent element thereof, thereby providing a three-way switching valve. Although the case where it implement | achieved with the solenoid valve was demonstrated, it is also possible to implement | achieve the three-way switching valve 1 by an electric motor system by employ | adopting an electric motor as an electromagnetic actuator.

One Embodiment of the three-way selector valve concerning this invention is shown, (a) is sectional drawing, (b) is the sectional view on the AA line of (a). It is a BB sectional view of the three-way selector valve shown in FIG. It is sectional drawing which shows the state which has supplied with electricity to the coil apparatus of the three-way selector valve shown in FIG. The plunger and 1st valve body of the three-way selector valve shown in FIG. 1 are shown, (a) is sectional drawing, (b) is the A section enlarged view of (a), (c) is a bottom view of (b). The other embodiment of the plunger of the three-way selector valve concerning this invention and a 1st valve body is shown, (a) is sectional drawing, (b) is the B section enlarged view of (a). It is sectional drawing which shows an example of the conventional three-way switching valve. 6A and 6B show a plunger and a first valve body of the three-way switching valve of FIG. It is explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Three-way switching valve 2 Coil apparatus 3 Casing 4 Plunger 4a Recessed part 4b Caulking protrusion 4c Recessed part 5 First valve body 6 Coil spring 7 Valve seat member 7a First valve chamber 7b Second valve chamber 7c First communication path 7d Second Communication path 7e Third communication path 7f First valve port 7g Second valve port 8 Piston 9 Lower lid 10 Second valve element 11 Coil spring 12 Actuating rod 13 Inflow pipe 14 First outflow pipe 15 Second outflow pipe 16 Brazing portion 17 Sealed space 18 Brazing part 19 Suction element

Claims (1)

An electromagnetic solenoid-type three-way switching valve in which a plunger that is slidably incorporated in a single straight tubular casing to which the coil device is fitted is slidably incorporated,
Attractor for the plunger to one end of the front mute pacing is, the other end is secured lid body,
Before the dumb pacing, an inlet pipe for inflow of fluid, said fluid selectively to the first outlet pipe and a second outlet pipe flowing out is connected, and the first valve chamber interior space and the second valve chamber And a valve seat member that is divided into
The valve seat member includes a first communication passage that communicates the inflow piping with the two valve chambers, a second communication passage that communicates the first valve chamber with the first outflow piping, and the second valve chamber. And a third communication passage communicating with the second outflow pipe,
In the first valve chamber, a first valve body for opening and closing the valve port of the second communication passage is provided integrally with the plunger,
In the second valve chamber, a piston having a second valve body that opens and closes the valve port of the third communication passage is movably provided,
A plurality of actuating rods that slidably penetrate the valve seat member and are interposed between the holding portion of the first valve body and the piston, and a biasing spring that biases the piston toward the first valve body The second valve body follows the displacement of the first valve body by the interlocking means consisting of:
The valve seat member, said inlet pipe, the first outlet pipe, said second outlet pipe is by furnace brazing techniques, it is pre-brazed hermetically fixed to the joining fitting portion of each relative to listen pacing An electromagnetic solenoid type three-way switching valve characterized by

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