JPH08303618A - Changeover valve - Google Patents

Abstract

PURPOSE: To provide a small-sized changeover valve which has a simple structure hardly causing water leakage. CONSTITUTION: Ports 2a, 2b, 2c are formed on a cylindrical casing 1 as inlets/ outlets of fluid. A rotary valve element 8 which has a long groove 9 on its surface for communicating the ports with each other is arranged inside the casing 1. The ports are communicated with each other through the long groove 9 at a prescribed rotating angle position of the valve element 8. Elastic closing bodies 20a, 20b each having a circular small projection 21a which is in contact with an opening peripheral edge of each of the ports 2b, 2c are formed on the positions of the valve element 8, for closing the ports 2a, 2b. A hollow chamber 14 is formed on back sides of the elastic closing bodies 20a, 20b to which fluid is made to flow for applying pressure of the fluid flowed into the casing 1 to the back surfaces of the elastic closing bodies 20a, 20b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching valve for switching a passage for a flow of water, oil, other liquid or gas, or for closing the passage.

[0002]

2. Description of the Related Art Conventionally, a three-way valve has been widely used as a switching valve. In this switching valve, a cylindrical casing is provided with a plurality of ports serving as fluid inlets and outlets, a rotating valve body is provided in the casing, and a groove / communication path is provided in the valve body.
The two ports communicate with each other through a groove / communication path at a predetermined rotation angle of the valve body, and the remaining ports are closed by the wall surface of the valve body.

[0003]

The closure between the port and the valve body of this conventional switching valve is to seal the valve body by closely contacting the valve body with the opening peripheral edge of the port, so that the casing and the valve body are closed. If the contact peripheral surface is not processed with high precision, water leakage is likely to occur, and with high-pressure fluid, water leakage is particularly likely to occur. Although this may be prevented by sealing it with an O-ring, it becomes difficult to sufficiently prevent water leakage due to deformation due to high friction and high pressure. The problem to be solved by the present invention is to solve the problems of the conventional switching valve, and to provide a switching valve with a simple structure that sufficiently seals the closure of the port and has very little water leakage.

[0004]

The structure of the present invention which has solved the above problems is as follows: 1) A rotating or sliding valve body provided with a plurality of ports serving as fluid inlets and outlets in a casing, and a passage communicating between the ports. Is provided in the casing, and at a predetermined rotation angle or sliding position of the valve body, the required ports communicate with each other through a passage and the other ports are closed by the valve body. At the position of the valve body to be attached, an elastic closing body having an annular small protrusion that comes into contact with the opening peripheral edge of the port is attached, and behind the closing body so that the pressure of the fluid flowing into the casing acts on the back surface of the elastic closing body. Switching valve characterized by forming a chamber into which a fluid flows in 2) The casing has a cylindrical shape with a bottom, and the valve body is rotatably fitted in the casing, and the shape is cylindrical and external. A groove serving as a passage is provided in the circumference, and the inner space of the valve body is a chamber into which fluid can flow, and a small hole communicating with the chamber is formed at the valve body position that closes the port, and a skirt-like protrusion is formed at the tip. The switching valve according to the above 1), wherein a columnar elastic closing body having a portion is fitted into the small hole. INDUSTRIAL APPLICABILITY The present invention is applicable to both a switching valve having a structure in which a valve body rotates in a casing and a switching valve type in which a valve body slides in a casing to switch ports.

[0005]

In the present invention, since the elastic closing body having the small projecting portion is attached at the valve body position which closes the port of the casing, when the port and the elastic closing body come to the opposite position, the small annular projection of the elastic closing body is provided. The portion closely adheres to the peripheral edge of the opening of the port and closes the opening of the port to prevent leakage. The fluid flows into the inside of the valve body, pressurizes the elastic closing body from the back side and presses the elastic closing body toward the port, and the elastic closing body is deformed and pressed against the opening peripheral edge of the port to complete the seal. . When the valve body rotates or slides, the protrusion of the protrusion is small and has a small area. Therefore, the friction resistance is small and the protrusion can be deformed to smoothly move the valve body. The casing and the valve body are cylindrical, the valve body is rotatably fitted in the casing,
If the elastic closing body is columnar and the tip of the elastic closing body projects in a skirt shape, the structure is simple, and there are few failures, and smooth operation is achieved.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a switching valve for switching a flow path of a small amount of tap water. FIG. 1 is a front view of the embodiment, and FIG.
Is a side view of the embodiment, FIG. 3 is a longitudinal sectional view of the embodiment, FIG. 4 is a sectional view taken along the line AA of FIG. 3, and FIG. 5 is a sectional view showing a state in which the valve body of the embodiment is rotated by 90 °. 6 is a perspective view showing the valve body of the embodiment, FIG. 7 is a front view showing the valve body of the embodiment, FIG. 8 is a plan view of the valve body of the embodiment, and FIG. 9 is a bottom view of the valve body of the embodiment. 10 is a side view of the valve body of the embodiment, FIG. 11 is a view taken along the line AA of FIG.
12 is a longitudinal sectional view of the embodiment, FIG. 13 is an explanatory view showing a port closed state of the embodiment, FIG. 14 is a perspective view showing an elastic closing body of the embodiment, and FIG. 15 is a cross-sectional view of a casing of the embodiment. . In the figure, 1 is a cylindrical bottomed cylindrical casing with a diameter of about 23 mm, 2a, 2b and 2c are ports of an opening with a diameter of about 4 mm which are perforated at 90 ° intervals on the lower outer peripheral wall of the casing, and 3 is a casing. Bottom of 1 4a, 4b, 4
c is a water pipe connected to the ports 2a, 2b, 2c, 5 is a lid, 6 is a stopper for small protrusions provided at two positions on the bottom surface 3, and 7 is a notch for positioning a small protrusion provided in the middle of the stopper 6 on the bottom surface 3. Claw, 8 is a valve element with a cylindrical outer diameter of about 17 mm,
9 is a long groove that serves as a passage for water provided on the lower surface of the valve body,
Reference numeral 0 is a rotary shaft standing on the head of the valve body 8, 11 is a knob attached to the upper end of the rotary shaft, 12 is an O-ring, 13 is an open bottom surface of the valve body 8, and 14 is inside the valve body 8. A hollow chamber, 15 is a pair of stoppers provided on the circular periphery of the bottom of the valve body 8, 16 is a small locking pawl for positioning provided in the middle of the stopper 15, 18,
Reference numeral 19 is a small hole drilled at the port closing position of the valve body. In the figure, 20a and 20b are rubber columnar elastic closures, and 21.
Reference characters a and 21b are skirt-shaped annular protrusions integrally formed at the tip of the elastic closing body. In this embodiment, tap water is sent from the water pipe 4a to the port 2a. Knob 1
1 is rotated, and the valve body 8 is rotated at the angle shown in FIG. In this state, the water in the port 2a flows into the port 2b through the long groove 9 and is sent to the water pipe 4b. Water from the port 2a also flows into the hollow chamber 14 inside the valve body 8 through a small escape groove (not shown) or a small hole provided in the valve body 8. At this angle, the elastic closing body 20a made of rubber is opposed to the other port 2c, and the annular protrusion 21a at the tip of the elastic closing body 20a is deformed to the peripheral edge of the opening of the port 2c as shown in FIG. In close contact. Moreover, the water in the hollow chamber 12 presses the elastic closing body 2a from the back surface in the direction of the port 2c by water pressure, so that the annular protruding portion 21a is compressed and deformed, and the annular protruding portion 21a is more closely attached to the opening peripheral edge of the port 2c and surely blocks the port 2c. Thereby, the water in the casing 1 and the port 2a
It prevents water from flowing into port 2c. Next, when the valve body 8 is rotated by the knob 11 and brought into the state of FIG. 5, the port 2a and the port 2c communicate with each other through the long groove 9, and water is sent from the port 2a to the water pipe 4c of the port 2c. In this state, the port 2b faces the elastic closing body 20b, and the annular protrusion 21b at the tip of the elastic closing body 20b is pressed against the port by the water pressure of the hollow chamber 14 to secure the port 2b in the same manner as the closing of the port 2c. To block.
By the rotation of the valve body 8, the elastic closing bodies 20a, 20b move while touching the inner surface of the casing 1, but the annular projecting portions 21a, 21b can rotate without difficulty because the projecting amounts of the annular projecting portions 21a, 21b are small and elastically deformable. The positioning of the valve body 8 at the angular positions shown in FIGS. 4 and 5 is performed by engaging the stopper 15 attached to the lower end of the valve body 8 and the stopper 6 on the bottom surface 3 inside the casing 1, The ports 2b and 2c and the elastic closing bodies 20a and 20b are accurately opposed to each other.

[0007]

As described above, according to the present invention, the elastic closing member is attached to the valve body, and the elastic closing member is pressed against the peripheral edge of the port opening by the fluid pressure from the rear surface to deform the elastic closing member. Then, I made it without water leakage. If the casing and the valve body have a cylindrical shape and the elastic closing body has a columnar shape, it is possible to provide a switching valve having a simple structure and a good sealing property.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a vertical sectional view of an example.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a cross-sectional view showing a state where the valve body of the embodiment is rotated by 90 °.

FIG. 6 is a perspective view showing a valve body of the embodiment.

FIG. 7 is a front view showing a valve body of the embodiment.

FIG. 8 is a plan view of the valve body of the embodiment.

FIG. 9 is a bottom view of the valve body of the embodiment.

FIG. 10 is a side view of the valve body of the embodiment.

11 is a view on arrow AA in FIG. 8. FIG.

FIG. 12 is a vertical sectional view of an example.

FIG. 13 is an explanatory diagram showing a port closed state according to the embodiment.

FIG. 14 is a perspective view showing an elastic closing body of the embodiment.

FIG. 15 is a cross-sectional view of the casing of the embodiment.

[Explanation of symbols]

 1 Casing 2a Port 2b Port 2c Port 3 Bottom 4a Water Pipe 4b Water Pipe 4c Water Pipe 5 Lid 6 Stopper 7 Notch Claw 8 Valve Disc 9 Long Groove 10 Rotating Shaft 11 Knob 12 O-ring 13 Bottom 14 Hollow Chamber 15 Stopper 16 Small Locking Claw 18 Small Hole 19 small hole 20a elastic closing body 20b elastic closing body 21a protruding portion 21b protruding portion

Claims (2)

[Claims] 1. A rotating or sliding valve body provided with a plurality of ports serving as fluid inlets and outlets in a casing, and a passage through which the ports can communicate with each other is provided in the casing, and the valve body has a predetermined rotation angle or sliding position. In a switching valve in which required ports communicate with each other through a passage and other ports are closed by a valve body, an annular small protrusion that contacts an opening peripheral edge of the port at a position of the valve body that closes the port. A switching valve, wherein an elastic closing body having a portion is attached, and a chamber into which a fluid flows is formed behind the closing body so that the pressure of the fluid flowing into the casing acts on the back surface of the elastic closing body. 2. The casing has a cylindrical shape with a bottom, the valve body is rotatably fitted in the casing, and the shape is cylindrical, and a groove serving as a passage is provided on the outer periphery, and the valve body is also provided. The inner space of is a chamber into which a fluid can flow, and a small hole communicating with the chamber is formed at a valve body position that closes the port, and a columnar elastic closing body having a skirt-shaped protrusion at the tip is provided in the small hole. The switching valve according to claim 1, which is fitted.