JPH0651648U - Valve structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a valve structure having functions of a flow path switching valve and a check valve with a simple structure. [Structure] A first valve seat 40 formed in the flow path 22,
A second valve seat 42 formed in the flow path 22 and a first valve seat 42 arranged in the flow path 22 for closing the first valve seat 40.
Is movable between the first valve seat 40 direction and the second valve seat 42 closing position, and the fluid flows in the flow path 22 from the first valve seat 40 direction to the second valve seat 42 direction. A valve body that moves to the second position when flowing, and moves to the first position when fluid flows in the flow path 22 from the second valve seat 42 direction to the first valve seat 40 direction. 44 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve structure, and more particularly to a valve structure for switching a flow path.

[0002]

[Prior art]

 Conventionally, in the case of switching the flow direction of the fluid between, for example, a separate first flow path and second flow path, a flow path switching valve that selectively switches the flow path via a selection means has been used. (See, for example, JP-A-63-225776). On the other hand, when it is desired to restrict the flow direction of the fluid flowing in the flow path to one direction, a check valve that opens the valve seat when the flow direction is the predetermined direction and closes the valve seat when the flow direction is the reverse direction is used. (See, for example, Japanese Utility Model Laid-Open No. 4-62471).

[0003]

[Problems to be solved by the device]

 However, the above-described conventional flow path switching valve and check valve have the following problems. For example, a water purifier for removing (purifying) impurities and residual chlorine contained in water is provided with a raw water inflow passage for introducing raw water and a drain discharge passage for discharging water in the water purifier to the outside. There is. When purifying raw water, the raw water inflow channel must be opened, the drain discharge channel must be closed, and at the same time backflow of the raw water toward the raw water inflow channel must be prevented. On the other hand, when discharging the water in the water purifier, the raw water inflow channel must be closed and the drain discharge channel must be opened, and at the same time drainage must be prevented from flowing toward the raw water inflow channel. Therefore, the conventional water purifier requires a flow path switching valve that switches the flow direction of water between the raw water inflow path and the drain discharge path, and a check valve to prevent backflow of water to the raw water inflow path. Become. Since two valves are required at the same time, the structure becomes complicated and the part becomes large. There is also a problem that the rise in manufacturing costs cannot be avoided. Therefore, an object of the present invention is to provide a valve structure having the functions of a flow path switching valve and a check valve with a simple structure.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has the following configuration. That is, a first valve seat formed in the flow passage, a second valve seat formed in the flow passage, and a first valve seat arranged in the flow passage and closing the first valve seat. Is movable between the first valve seat direction and the second valve seat closing position, and when the fluid flows in the flow path from the first valve seat direction to the second valve seat direction, A valve body that moves to the second position and moves to the first position when the fluid flows in the flow path from the second valve seat direction to the first valve seat direction. And More specifically, the first valve seat and the second valve seat may be vertically separated from each other, and the valve element may be a sphere. The valve structure according to the present invention is particularly suitable for use in a water purifier, for example, the first valve seat communicates with a raw water inflow passage of the water purifier, and the second valve seat has a drain discharge passage of the water purifier. The raw water inflow passage may be arranged below the drain discharge passage.

[0005]

[Action]

 The operation will be described. The valve body is arranged in the flow passage and is movable between a first position that closes the first valve seat and a second position that closes the second valve seat. When the fluid flows from the first valve seat direction to the second valve seat direction, it moves to the second position, and the fluid flows in the flow path from the second valve seat direction to the first valve seat direction. If it does, it moves to the first position. Therefore, it becomes possible to switch the flow passage which is the flow destination between the flow passage communicating with the first valve seat and the flow passage communicating with the second valve seat, and at the same time, the reverse flow of the fluid is prevented. It becomes possible to prevent it.

[0006]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this example, the valve structure used to switch the flow path between the raw water inflow passage and the drain discharge passage of the water purifier for removing (purifying) impurities and residual chlorine contained in water is taken as an example. I will explain. FIG. 1 shows a cross-sectional view of the water purifier 10. Reference numeral 12 denotes a casing, which includes an upper constituent member 14 and a lower constituent member 16. The upper constituent member 14 and the lower constituent member 16 are fitted to each other, and the connecting portion is watertightly secured by the first seal member 18.

Reference numeral 20 denotes a water purification cartridge, which is arranged in the casing 12. A space serving as a flow path of raw water is secured between the outer surface of the purified water cartridge 20 and the inner surface of the casing 12. Raw water can enter the inside from the upper surface of the water purification cartridge 20 (arrow B). A purification material (for example, activated carbon, hollow fiber membrane) (not shown) is housed in the water purification cartridge 20, and impurities and residual chlorine contained in the raw water that has entered the inside are filtered and adsorbed to be purified. The purified water (purified water) flows out from the outlet 30 provided at the bottom of the purified water cartridge 20. Reference numeral 22 denotes a valve portion that forms a part of the flow path, and the detailed structure will be described later, but is provided at the bottom portion of the lower component member 16 of the casing 12. The valve portion 22 communicates with the raw water inflow passage 24, the drain discharge passage 26, and the internal space of the casing 12. Reference numeral 28 denotes a water supply passage, which is provided at the bottom of the casing 12. One end of the water supply passage 28 communicates with the outlet 30 of the water purification cartridge 20. The outflow port 30 of the cartridge 20 is fitted into one end of the water supply passage 28, and the second seal member 32 is interposed between the two, thereby preventing the unpurified water from entering the water supply passage 28. There is. The other end of the water supply path 28 is connected to an external device (not shown) such as a water tap or an electrolytic ion water generator.

Reference numeral 34 is an air bleeding valve, which is provided on the top of the upper component member 14 of the casing 12. An upper end of the air vent valve 34 is open to the atmosphere, and a lightweight ball valve body 36 made of a synthetic resin is vertically movable therein. The movement of the lightweight ball valve element 36 at the lower end of the air bleed valve 34 is restricted by a stopper 37. When the air remains in the casing 12, the air collects in the upper part, and water does not enter the air vent valve 34 while the air remains, so that the lightweight ball valve element 36 contacts the stopper 37. 2 (see FIG. 2), the air vent valve seat 38 of the air vent valve 34 is opened, and the air in the casing 12 is released into the atmosphere. On the other hand, when the raw water fills the casing 12, the lightweight ball valve element 36 moves upward due to the buoyancy of the raw water, and closes the air vent valve seat 38 of the air vent valve 34 (the state shown in FIG. 1). After that, the lightweight ball valve element 36 is pressed against the air bleed valve seat 38 by the pressure of the raw water fed into the casing 12, and the raw water is prevented from overflowing from the upper end of the air bleed valve 34.

Next, the structure of the valve portion 22 will be described in detail. The valve portion 22 communicates with a raw water inflow passage 24 for introducing raw water at the bottom. The upper end of the raw water inflow passage 24 communicates with the valve portion 22 and forms a first valve seat 40. On the other hand, the valve portion 22 is connected at its side portion to the drain discharge passage 26 for discharging the water in the casing 12 to the outside. The left end of the drain discharge passage 26 projects into the valve portion 22 and forms a second valve seat 42. The second valve seat 42 is formed at a position facing the first valve seat 40. The drain discharge path 26 is provided above the raw water inflow path 24 and below the water supply path 28. In this embodiment, the drain discharge passage 26 is always open, but an open / close valve (not shown) may be provided in the middle to open / close the drain discharge passage 26. The valve portion 22 communicates with the inside of the casing 12 at the upper end portion.

Reference numeral 44 denotes a ball valve body which is an example of a valve body, which is made of synthetic resin and can move up and down. The ball valve element 44 moves between a first position (the position in FIG. 2) that closes the first valve seat 40 and a second position (the position in FIG. 1) that closes the second valve seat 42. It is possible. When the raw water fed from the raw water inflow passage 24 flows from the first valve seat 40 direction to the second valve seat 42 direction, the ball valve body 44 is pushed up by the pressure of the raw water to the second position. Moving. On the other hand, when water flows from the direction of the second valve seat 42 to the direction of the first valve seat 40, the ball valve element 44 moves downward due to gravity and flowing water pressure, the second valve seat 42 is opened, and the water is discharged. It is discharged from the drain discharge path 26.

Next, the operation of the valve structure of this embodiment will be described with reference to FIGS. 1 and 2. First, the case of purifying raw water with the water purifier 10 will be described with reference to FIG. When the raw water is fed from the raw water inflow passage 24, the ball valve body 44 is pushed up by the pressure of the raw water to open the first valve seat 40 and close the second valve seat 42 (the state shown in FIG. 1). . Then, the raw water flows as shown by arrow A and enters the casing 12. The raw water that has entered the casing 12 enters the water purification cartridge 20 from the upper surface of the water purification cartridge 20 (arrow B) and is purified. At that time, the air in the casing 12 is evacuated from the air bleeding valve 34, and when there is no air in the casing 12, the lightweight ball valve body 36 closes the air bleeding valve 34 (state in FIG. 1). The water purified in the water purification cartridge 20 is sent from the outlet 30 to the water supply path 28 (arrow C) and sent to the destination.

Next, the case of discharging the water in the casing 12 will be described with reference to FIG. When the feed of the raw water from the raw water inflow passage 24 is stopped, the ball valve body 44 loses the pressure of the raw water and moves downward due to the pressure of the water moving downward from inside the casing 12 and the second valve seat 42. Is opened and the first valve seat 40 is closed (state of FIG. 2). Then, the raw water remaining in the casing 12 flows as shown by an arrow D, and is discharged to the outside from the valve portion 22 via the drain discharge path 26. At that time, the purified water remaining in the purified water cartridge 20 is sent out from the outlet 30 to the water supply passage 28 (arrow C). When the water pressure (water level) of the raw water in the casing 12 falls while the water in the casing 12 is being discharged, the lightweight ball valve element 36 also descends and the air bleeding valve 34 is opened (the state shown in FIG. 2). When the air vent valve 34 is opened, the atmospheric pressure exerts pressure on the water in the casing 12, so that drainage from the drain discharge passage 26 and the outlet 30 of the water purification cartridge 20 can be promoted. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the valve body may be rod-shaped instead of spherical, for example, without departing from the spirit of the invention. Of course, many more modifications can be made in the range.

[0013]

[Effect of device]

 When the valve structure according to the present invention is used, the valve body is disposed in the flow path and is provided between the first position that closes the first valve seat and the second position that closes the second valve seat. When the fluid flows in the flow passage from the first valve seat direction to the second valve seat direction, it moves to the second position, and the fluid flows in the flow passage to the second valve seat. If it flows from the direction from the direction to the first valve seat, it moves to the first position. Therefore, it becomes possible to switch the flow passage which is the flow destination between the flow passage communicating with the first valve seat and the flow passage communicating with the second valve seat, and the reverse flow of the fluid. Since it is possible to prevent this, it is possible to realize a valve structure that combines the functions of a flow switching valve and a check valve with an extremely simple structure. Further, since the functions of the flow path switching valve and the check valve can be realized with a single valve structure, it is possible to reduce the size of the relevant portion, and further, it is possible to reduce the manufacturing cost. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a purified water state of a water purifier including a valve structure according to the present invention.

FIG. 2 is a sectional view showing a drainage state in the water purifier of FIG.

[Explanation of symbols]

 10 Water Purifier 12 Casing 20 Water Purification Cartridge 22 Valve Section 24 Raw Water Inflow Channel 26 Drain Discharge Channel 28 Water Transmission Channel 34 Air Venting Valve 40 First Valve Seat 42 Second Valve Seat 44 Ball Valve Body

Claims (5)

[Scope of utility model registration request] 1. A first valve seat formed in a flow passage, a second valve seat formed in the flow passage, and a first valve seat arranged in the flow passage and closing the first valve seat. Between the first position and the second position where the second valve seat is closed, and the fluid flows in the flow path from the first valve seat direction to the second valve seat direction. And a valve element that moves to the second position when the fluid flows in the flow path from the second valve seat direction to the first valve seat direction and moves to the first position. A valve structure characterized by that. 2. The valve structure according to claim 1, wherein the first valve seat and the second valve seat are arranged vertically separated from each other. 3. The valve structure according to claim 1, wherein the valve body is a sphere. 4. The first valve seat communicates with a raw water inflow passage of the water purifier, and the second valve seat communicates with a drain discharge passage of the water purifier. 2 or 3
The valve structure described. 5. The valve structure according to claim 4, wherein the raw water inflow passage is arranged below the drain discharge passage.