JP4928201B2 - Water pressure driven flow path switching valve - Google Patents

Description

  The present invention relates to a flow path switching valve used in, for example, an apparatus for groundwater investigation, etc., and is capable of controlling a water flow by a plurality of systems of feeding and draining, and is a highly convenient flow path that solves problems of opening and closing and explosion-proof. An object is to provide a switching valve.

  As the flow path switching valve, in the conventional system for handling fluids such as heat pump type air conditioners, the entire system is miniaturized by integrating the electromagnetic switching valves that have been individually arranged. It is known that a rotary switching valve driven by a motor can be switched by energization only at the time of switching to save power.

  Specifically, a housing in which a plurality of holes drilled in a radial direction to connect pipes and form a flow path are arranged at predetermined positions in the axial direction and the circumferential direction, and a rotation fixed to the housing Drive means, and a cylindrical body fixed inside the housing, and a plurality of holes that are pierced in a radial direction so as to communicate with the plurality of holes in the housing have predetermined axial and circumferential directions. And a spool that forms a flow path by selectively communicating the holes with each other through axial and circumferential grooves, and a flow that is inserted into the cylindrical space at the center of the spool. A plurality of holes drilled in the radial direction to form a path are disposed at predetermined positions in the axial direction and the circumferential direction, and are rotated by the driving means for rotation and stopped at the predetermined positions. By the above Is of a structure as comprising a rotor that forms a selectively communicating to channel a plurality of holes in Lumpur (see Japanese Patent Laid-Open No. 6-194007).

In addition, for example, in order to be able to carry out both actions of injecting liquid such as gasoline, kerosene, or water into a container such as a portable plastic can and discharging it from the container without replacing the pump. The flow is designed to have both discharge and injection functions by installing a flow path switching valve in the flow path of a conventional simple pump where the rotation direction of the rotor blades is constant, and changing the flow direction of the fluid. A path switching valve is also known (see Japanese Utility Model Publication No. 7-4888).

Further, as shown in FIG. 6, a piston passage 1a is formed in the valve body 1, and one water supply line a and two drain lines c and d are formed along the piston passage 1a. Further, the piston passage 1a described above is connected to the main body 1 via the sealing materials 3 and 3 in the area of the water supply line a, and to the main body 1 via the sealing materials 4a, 4b and 4c. The other opening is inserted into the area of the drainage line c and d through the piston 2 having a water supply line b formed therein, and the piston 2 is actuated by water pressure drive in the main body 1 to supply water. Water pressure drive in which the line a is connected to the drainage line c via the water supply line b of the piston 2 (FIG. 6A) or the drainage line d [FIG. 6B] to switch the water supply route. Channel cut off Valve is also considered.
Japanese Patent Laid-Open No. 6-194007 Japanese Utility Model Publication No. 7-4888

  However, the above-described hydraulic drive system shown in FIG. 6 has a single system control structure, and thus has a difficulty in controlling a plurality of systems separately, and is disclosed in Patent Documents 1 and 2. Since most of the valves of the conventional structure including the ones that have been developed are based on electrical control, there is a risk that the valve will be immediately stopped due to an electrical trouble such as a power outage, causing it to become inoperable. is there.

Therefore, the present invention has developed a water flow switching valve that is easy to handle, such as the danger of electrical troubles and no need for consideration of explosion-proofing, and the ability to control multiple systems as required. be those were, specifically, made from a sliding movable passage switching rod along the rod hole formed in the valve body and the valve body, wherein the inner valve body, the length of the rod hole is a piston chamber having a water passage in the direction across and along with formed water supply passage and a plurality of drainage channels respectively along the moving direction of the flow path switching rod, the flow path switching rod, said piston chamber the piston sliding movement is provided integrally, and more inside the flow path switching rod, one end to the water supply passage, also with the movement of the passage switching rod With water passage either in the were also opposable opened to the other end a plurality of drainage is provided, the said piston chamber, the elastic force is the same but the length mutually different plurality of springs, the flow The piston of the path switching rod is inserted so as to urge the piston toward the movement direction of the water supply channel, and the plurality of springs correspond to different ones of the plurality of drainage channels, respectively. The present invention relates to a hydraulically driven flow path switching valve characterized in that the flow path switching rod is stopped at a plurality of positions so that the opening on the drainage path side of the water flow path of the path switching rod faces each of the plurality of drainage paths .

  According to the present invention, since the valve body has a piston chamber having water passages at both ends, and the piston is moved through the water passage, there is no need to use electric power, and thus there is a power trouble such as a power failure. In such cases, there is no hindrance to the switching operation of the valve, and there is no danger of ignition when used as a flow path switching valve in, for example, a groundwater survey device. And can be used conveniently.

  Furthermore, since the water flow path provided inside the flow path switching rod is used as a water supply path, the structure is simplified, the possibility of failure is extremely low, and when three or more drainage paths are formed in the valve body, a plurality of systems are used. There are effects such as enabling flow path switching control.

The specific contents of the present invention will be described below based on the reference examples of the present invention shown in FIGS. 1 to 3. In each figure, 11 is a valve body, and 19 is vertically oriented in the valve body 11. The flow-path switching rod which can move along the rod hole 15 provided is shown. A piston chamber 12 having water passages 13 and 14 at both ends in the vertical direction is provided inside the valve body 11, and the water supply path 16 and the plurality of water supply paths 16 are arranged along the movement direction (vertical direction) of the flow path switching rod 19. Drain channels 17 and 18 are formed respectively.

  The flow path switching rod 19 is integrally provided with a piston 21 that slides and moves in the piston chamber 12, and the flow path switching rod 19 has an opening 20a at one end across the portion of the piston 21 described above. Is always connected to the water supply path 16 regardless of the position of the flow path switching rod 19 through the sealing materials 22a and 22b, and the opening 20b at the other end is closed through the sealing materials 22d and 22e and 22f and 22g. A water flow path 20 is provided so as to be openable to any one of the plurality of drainage paths 17 and 18. Reference numeral 23 denotes a spring that urges the piston in the direction in which the piston is pushed upward in the piston chamber 12.

  In the above configuration, the state shown in FIG. 1 opens the water passage 13 and feeds a liquid such as water from the water passage 14 into the piston chamber 12 and pushes the piston 21 up to the upper end so that the flow path switching rod 19 is moved. By moving to the uppermost position, the other end opening 20b of the water supply passage 20 is positioned between the sealing materials 22d and 22e, and the water supply passages 16 and 20 are in the “closed” state. In this case, the piston 21 may be moved upward only by the urging force of the spring 12 in the piston chamber 12 instead of water supply from the water passage 14.

  Next, when the water supply channels 16 and 20 are communicated to the drainage channel 17 from the closed state of FIG. 1, the water channel 14 is opened as shown in FIG. 2, and water or the like is passed from the water channel 13 into the piston chamber 12. Then, the piston 21 is slightly lowered to move the flow path switching rod 19 slightly in the direction of the arrow. Accordingly, the other end opening 20b of the water supply channel 20 reaches a position facing the drainage channel 17 surrounded by the sealing materials 22e and 22f, whereby the water supply channels 16, 20 can be communicated with the drainage channel 17.

  Further, when the water supply passages 16 and 20 shown in FIG. 2 are switched to the drainage passage 18 from the state where they are communicated with the drainage passage 17, as shown in FIG. 3, the water passage 13 enters the piston chamber 12. The piston 21 is further lowered against the urging force of the spring 23, and the flow path switching rod 19 is further moved in the direction of the arrow. Thus, the other end opening 20b of the water supply channel 20 reaches a position facing the drainage channel 18 surrounded by the sealing materials 22f and 22g, and the water supply channels 16 and 20 can be communicated with the drainage channel 18.

  Note that the closing of the water channels 16 and 20 and the detection of the communication switching position to the drain channel 17 or 18 may be performed simply by restricting the amount of water flowing from the water channel 13 or 14 to a constant amount. However, when the biasing force of the spring 23 attached in the piston chamber 12 is used and the water passages 13 and 14 are opened and only the biasing force of the spring 23 is used, it may be “closed” (state of FIG. 1).

  In addition, the water passage 14 is opened and liquid is passed through the water passage 13, and the water is supplied automatically by stopping the piston 21 at that position by automatically stopping by the increase in water pressure from the water passage 13 by the weak biasing force of the spring 23. The channels 16 and 20 are communicated with the drainage channel 17 (the state shown in FIG. 2), and the water pressure from the water channel 13 is further increased to further move the piston 21 against the urging force of the spring 23, thereby supplying the water channel 16. The urging force of the spring 23 may be used in combination as described above, for example, 20 is communicated with the drainage channel 18 (state shown in FIG. 3).

4 and 5 show an embodiment of the present invention. In these drawings, each basic configuration of the valve body 11 and the flow path switching rod 19 movable along the rod hole 15 provided in the valve body 11 in the vertical direction is the same as that of the reference example described above. Since only the differences will be described below, the valve body 11 has a total of four drainage channels including drainage channels 18b and 18c through sealants 22h and 22i in addition to the drainage channels 17 and 18a. Is provided.

  In the piston chamber 12, four types of springs 23a to 23d having the same elastic force but different lengths are loaded. The longest spring 23a is placed in the drainage channel 17 and the spring 23b is drained. The spring 18c corresponds to the drain 18b, and the spring 23d corresponds to the drain 18c. That is, as shown in FIG. 4, when the piston 21 is positioned at the upper end in the piston chamber 12, the flow path switching rod 19 is positioned at the uppermost end in the rod hole 15 of the valve body 11 and the other end of the water supply path 20 is opened. Since 20b is located between the sealing materials 22d and 22e, the water supply channels 16, 20 are in a "closed" state.

  Therefore, when the water passage 14 is opened and liquid is fed from the water passage 13 into the piston chamber 12, the piston 21 gradually descends and comes into contact with the upper end portion of the spring 23a, and an elastic force is applied by the spring. By the way, the other end opening 20b of the flow path switching rod 19 is located between the sealing materials 22e and 22f and communicates with the drainage channel 17 in opposition. When the water supply pressure is further increased from the water passage 13 into the piston chamber 12, the piston 21 gradually descends against the elastic force of the spring 23a and comes into contact with the upper end of the spring 23b. When the force is doubled, the water supply pressure from the water passage 13 stops and the other end opening 20b of the flow path switching rod 19 is located between the sealing materials 22f and 22g and communicates with the drainage path 18a. (State of FIG. 5).

  Further, when the water supply pressure from the water passage 13 is increased, the piston 21 descends against the springs 23a and 23b and comes into contact with the upper end portion of the spring 23c. The other end opening 20b of the flow path switching rod 19 is positioned between the sealing materials 22g and 22h and communicates with the drainage path 18b.

  Similarly, when the water supply pressure from the water passage 13 is further increased, the piston 21 descends against the springs 23a, 23b, and 23c and comes into contact with the upper end of the spring 23d, and the spring force of the spring is quadrupled. When the water supply pressure from the water passage 13 is over, the other end opening 20b of the flow path switching rod 19 is located between the sealing materials 22h and 22i and can communicate with the drainage path 18c. It should be noted that the above-described adjustment of the amount of water supplied from the water passage 13 can be carried out by a method such as attaching a water supply means having a water pressure sensing means such as a water pressure sensor.

Sectional drawing of the water pressure drive type flow-path switching valve which is a reference example of this invention. Sectional drawing of the water pressure drive type flow-path switching valve which is a reference example of this invention. Sectional drawing of the water pressure drive type flow-path switching valve which is a reference example of this invention. Sectional view of the hydraulic-driven flow switching valve is a real施例of the present invention. Sectional view of the hydraulic-driven flow switching valve is a real施例of the present invention. Sectional drawing of the conventional water pressure drive type flow-path switching valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Valve main body 12 Piston chamber 13 Water flow path 14 Water flow path 15 Rod hole 16 Water supply path 17 Drainage path 18a Drainage path 18b Drainage path 18c Drainage path 19 Flow path switching rod 20 Water supply path 20a One end opening 20b of flow path switching rod 19 Opening of the other end of the switching rod 19 21 Piston 22 Sealing material 23 Spring

Claims (2)

It consists of a valve body and a flow path switching rod slidably movable along a rod hole formed in the valve body,
Wherein the inner valve body, a piston chamber having a water passage in the longitudinal direction at both ends of the rod hole and thereby form a water supply passage and a plurality of drainage channels respectively along the moving direction of the passage switching rod ,
The said channel switching rod, the piston is provided integrally to slide moving said piston chamber,
Further, the inside of the passage switching rod, one end to the water supply passage, also the water passage either in that also opposable allowed to open the plurality of drainage channels and the other end with the movement of the passage switching rod As well as
Wherein the piston chamber, the elastic force is the same that although different spring lengths from each other, the piston of the flow path switching rod is charged so as to bias toward the water supply path side direction of movement,
Each of the plurality of springs corresponds to a different one of the plurality of drainage channels, and therefore, the opening on the drainage channel side of the water flow channel of the channel switching rod faces each of the plurality of drainage channels. A water pressure-driven channel switching valve characterized by stopping the channel switching rod at a plurality of positions .   An opening on one end side toward the water supply channel of the water flow channel provided in the flow channel switching rod is always located between a pair of sealing materials interposed on both sides of the flow channel switching rod in the moving direction across the water supply channel. The hydraulically driven flow path switching valve according to claim 1, which is configured as described above.

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