JP2002323157A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a check valve in which flow is not prevented by a strip- or band-state foreign substance, even if it is present in a fluid in a liquid passage. SOLUTION: In a check valve in which an inlet side passage 1A and an outlet side passage 1B are arranged into an L-shaped, a valve body 1 with a valve seat 1f formed on an end face of the inlet side passage 1A inside and a valve seat 3 brought close and separated from the valve seat 1f are mounted, a float 12 is provided reciprocating according to the flow of a fluid in the axial direction of the inlet side passage 1A with an inlet side guide 12g freely engaged with the end inside diameter of the inlet passage 1A, arranged at the inlet side of the valve seat and a guide rod 12h on the other, the inlet side guide 12g of the float 12 is formed into a cylindrical shape, and a part of the cylinder is cut to form a fluid outlet 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve provided in a liquid flow path.

[0002]

2. Description of the Related Art FIG. 3 is a structural view of a conventional check valve in a closed state. FIG. 3 (a) is a sectional view, and FIG. 3 (b) is a transverse sectional view of an inlet side guide portion of a float. FIG. 4 is a sectional view of the check valve in an open state. In the figure, reference numeral 1 denotes a valve body, in which an inlet-side flow path 1A and an outlet-side flow path 1B are formed in an L shape, and a valve seat 1f forming a check valve is provided on a valve inner end face of the inlet-side flow path 1A. Have been. Numeral 2 denotes a float, in which a valve seat 3 which comes in contact with and separates from a valve seat 1f provided in the valve body 1 in the middle is mounted, and a cylindrical portion 2a is provided on the inlet side flow path 1A side of the valve seat 3, and FIG. A plurality of ribs are provided radially as shown in the figure, and the outer edge of the rib is inserted into the inner diameter of the inlet side flow path 1A of the valve body 1 in a free state, and the float 2 reciprocates in the axial direction of the inlet side flow path 1A. An inlet side guide 2g for guiding and a guide rod 2h arranged on the back of the mounting portion of the valve seat 3 for smooth reciprocating movement of the float 2 are provided. Reference numeral 4 denotes a magnet attached to the upper end of the guide rod 2h. Reference numeral 5 denotes a guide cylinder 5a for guiding the reciprocating motion of the guide rod 2h inside the valve. A detection switch 6 that is operated by the proximity of the magnet 4 is disposed on the outer surface. The upper lid. 10 is a fluid outlet.

[0003] The cylindrical portion 2a of the inlet side guide 2g is provided in order to set the movement distance of the float to the position where the detection switch 6 operates even when the flow rate is small, and a plurality of radially arranged ribs are provided. The cylindrical portion 2a is provided so that it can reciprocate without colliding with the valve seat 1f of the valve body 1.

In this configuration, the fluid flows through the inlet side flow path 1A.
, The float 2 advances to the outlet side flow path 1B side, and the fluid passes between the ribs of the inlet side guide 2g, radially flows out from the fluid outlet 10 around the rib, and flows into the outlet side flow path 1B. Flows. When the float 2 moves forward due to the flow of the fluid, the magnet 4 approaches the detection switch 6, and the detection switch 6 closes to detect the flow state.

When the flow of the fluid stops and the fluid in the outlet side flow path 1B tries to flow backward, the float 2 retreats, the valve seat 3 comes into contact with the valve seat 1f, the flow path is closed, and the back flow is prevented. When the float 2 moves backward, the distance between the magnet 4 and the detection switch 6 increases, and the detection switch 6 opens.

[0006]

In the conventional check valve having the above construction, if a string-like or band-like foreign matter is present in the flowing fluid, a plurality of ribs on the inlet-side guide 2g of the float 2 are provided. The string-shaped or band-shaped foreign matter may be caught over the flow path divided by the above, and the end of the caught foreign matter may extend to the valve seat 1f. When the number of foreign matters caught increases, the fluid outlet 10 is blocked, the space through which the fluid passes becomes narrow, and the flow rate decreases. In addition, when the flow of the fluid is stopped, there is a problem that the valve seat 3 does not adhere to the valve seat 1f due to the foreign matter extending to the portion of the valve seat 1f, and the function of preventing the backflow of the fluid is lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and even if a string-like or band-like foreign matter is contained in a fluid, the foreign matter can pass through the check valve portion without being caught, thereby operating normally. It is an object of the present invention to provide a non-return valve.

[0008]

According to a first aspect of the present invention, there is provided a check valve in which a float inlet guide is formed in a cylindrical shape, and a part of the cylindrical shape is cut off to form a fluid outlet. is there.

According to a second aspect of the present invention, there is provided a check valve,
An arc-shaped steering rib having an inner edge along the flow direction is provided at an inner surface corner of the inlet-side guide opposite to the fluid outlet of the inlet-side guide according to the first aspect.

According to a third aspect of the present invention, there is provided a check valve,
A steering rib is provided in the fluid outlet direction on the back surface of the float valve seat according to the first aspect on which the float valve seat is mounted.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of an operation state of the check ring according to the first embodiment, and FIG.
FIG. 1B is a cross-sectional view, and FIG. 1B is a cross-sectional view of an inlet-side guide of the float. In the figure, reference numeral 1 denotes a valve body, an inlet-side flow path 1A and an outlet-side flow path 1B are formed in an L shape, and a valve seat 1f forming a check valve is provided on an inner end surface of the inlet-side flow path 1A. ing. Numeral 12 denotes a float, on which a valve seat 3 which comes in contact with and separates from a valve seat 1f provided in the valve body 1 is mounted, and the inlet side of the valve seat 3 is formed in a cylindrical shape as shown in FIG. An inlet-side guide 12g in which a portion in the lateral direction is cut off from the valve seat 3 to form a fluid outlet 20, and a steering rib 12s having an arc-shaped inner edge is formed in an inner corner opposite to the fluid outlet 20. And a guide rod 12h is provided at the center of the back surface on which the valve sheet 3 is mounted. 4 is a magnet attached to the upper end of the guide rod 12h, and 5 is a guide cylinder 5a which guides the reciprocating operation of the guide rod 12h at the center.
And a detection switch 6 that operates when the magnet 4 approaches the outer surface.

The cylindrical portion 12a of the inlet side guide 12g
Is provided so that the movement distance of the float when the flow rate is small is the position where the detection switch 6 is operated.

When a fluid flows through the check valve thus constructed, the float 12 floats on the outlet side flow path 1B side as in the conventional structure, and the fluid flows from the fluid outlet 20 of the inlet side guide 12g to the outlet. It flows out to the side channel 1B. The flow direction of the fluid is straightened by the provision of the steering ribs 12s and flows out in a flow parallel to the direction of the fluid outlet 20, so that the direction of the fluid outlet 20 is always the direction of the outlet-side flow path 1B that is largely open. When the float 12 floats, the magnet 4 approaches the detection switch 6, closes the detection switch 6, and the flow state is detected.

The flow state of the fluid stops, and the outlet side flow path 1B
When the fluid attempts to flow backward, the float 12 retreats, the valve seat 3 comes into contact with the valve seat 1f, the flow path is closed, and the backflow of the fluid is prevented. When the distance between the magnet 4 and the detection switch 6 increases, the detection switch 6 opens.

With this configuration, the string-like or band-like foreign matter existing in the fluid does not pass through the inlet side guide 12g without being caught and blocks the flow path. When the flow of the fluid stops, the valve seat 3 is
In this configuration, the function of preventing backflow of the fluid in close contact with f is not lost.

Embodiment 2 FIG. 2 is a sectional view of the float according to the second embodiment in an open state. In the first embodiment, the direction of the fluid outlet is along the flow when the flow rate is high, and is the direction of the outlet side flow path. However, when the flow rate is low, the direction of the fluid outlet does not always face the outlet side flow path side. . When the fluid outlet is in a direction opposite to the outlet-side flow path, it is assumed that a string-shaped or band-shaped foreign matter is caught on the edge of the cylindrical fluid outlet or the guide shaft portion. In the second embodiment, the fluid outlet is always directed downstream so that such a state does not occur.

FIG. 2 is a sectional view showing a state in which the fluid according to the second embodiment is flowing. FIG. 2 shows a configuration in which a steering rib is provided on the back side in the direction of the fluid outlet of the inlet-side guide of the float having the configuration of FIG. 1, and the other configuration is the same as that of FIG. In FIG. 2, reference numeral 22 denotes a float, in which a valve seat 3 which comes in contact with and separates from a valve seat 1f provided in the valve body 1 is mounted in the middle, and forms a cylinder in the axial direction of the inlet side flow path 1A of the valve seat 3. , Leaving the cylindrical portion 22a from the valve seat 3 and leaving the cylindrical outlet side flow path 1B
The fluid outlet 20 is formed by notching a part of the side, and an arc-shaped steering rib 22s is formed on the inner surface opposite to the fluid outlet 20,
The cylindrical portion is inserted into the inner diameter of the inlet-side flow path 1A in a loose state, and the inlet-side guide 2 for guiding the reciprocating operation of the float 22
A guide rod 22h for smooth reciprocating motion is provided on the back side of the valve seat 3 and the valve seat 3g. Reference numeral 25 denotes a steering rib provided in the direction of the fluid outlet 20 on the back surface of the float 22 on the inlet side guide 22g side.

The cylindrical portion 22a of the inlet side guide 22g
Is provided so that the movement distance of the float when the flow rate is small is the position where the detection switch 6 is operated.

Since the steering ribs 25 are provided on the float 22, the state in which the fluid outlet 20 always faces the direction of the outlet side flow path 1B due to the flow of the fluid can be maintained. The fluid outlet 20 is directed to the side flow path 1B side, so that the string-shaped or band-shaped foreign matter does not catch on the edge of the fluid outlet 20.

[0020]

The check valve according to claim 1 of the present invention has a structure in which the inlet guide of the float is formed in a cylindrical shape, and a part of the cylindrical shape is cut off to provide a fluid outlet.
Even if a string-like or band-like foreign matter is present in the fluid, it passes without being caught by the inlet-side guide, and does not block the flow path, thereby preventing the valve seat from sticking to the valve seat. The configuration is such that the function of preventing the backflow of the fluid is not lost.

According to a second aspect of the present invention, there is provided a check valve,
An arc-shaped steering rib having an inner edge along the flow direction is provided at an inner surface corner of the inlet-side guide opposite to the fluid outlet of the inlet-side guide, so that the flow direction of the fluid is straightened and parallel to the fluid outlet direction. As a result, the fluid flows out, and the direction of the fluid outlet always becomes the direction of the outlet side flow path.

According to a third aspect of the present invention, there is provided a check valve,
Since the steering rib is provided in the direction of the fluid outlet on the back surface where the float valve seat of the configuration of claim 1 is mounted,
Even when the flow rate is low, the fluid outlet is always in the direction of the outlet-side flow path, so that a check valve with stable flow can be constructed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an operation state of a check ring according to a first embodiment;

FIG. 2 is a sectional view of an operation state of a check valve according to a second embodiment.

FIG. 3 is a configuration diagram of a conventional check valve in a closed state.

FIG. 4 is a cross-sectional view of an operation state of a conventional check valve.

[Description of Signs] 1 valve body, 1A inlet side flow path, 1B outlet side flow path, 1
f Valve seat, 3 valve seat, 6 detection switch, 12 float, 12g inlet side guide, 12s steering rib, 2
2 floats, 22g inlet guide, 22s steering ribs, 25 steering ribs.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H058 AA02 BB11 BB33 CA04 CA05 CA06 CA31 CC02 CC05 EE01 3H068 AA01 BB81 BB82 CC10 DD01 DD12 EE01 FF07 GG20

Claims (3)

[Claims] An inlet-side flow path and an outlet-side flow path are arranged in an L-shape, a valve body having a valve seat formed on a valve inner end surface of the inlet-side flow path, and the valve body being in contact with or separated from the valve seat. A valve seat is mounted, an inlet guide inserted into the inlet side of the valve seat at the inlet side of the inlet-side flow path in a loose state, and a guide rod on the back side of the valve seat are disposed, and a fluid flow is provided. And a float that reciprocates in the axial direction of the inlet-side flow path according to the above, wherein the inlet-side guide of the float is formed in a cylindrical shape, a part of which is cut away to form a fluid outlet. A check valve. 2. The non-return valve according to claim 1, wherein an arc-shaped steering rib having an inner edge along a flow direction is provided at an inner surface corner of the inlet side guide opposite to the fluid outlet. 3. The non-return valve according to claim 1, wherein a steering rib is provided in a fluid outlet direction on a back surface on which the float valve seat is mounted.