JPH11344274A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a size of a check valve to be set small and concurrently enable a smooth operation of the valve body to be carried out. SOLUTION: A valve body abutting member 2 is provided with a valve seat 20 projected toward a downstream side and having a smaller outer diameter size than an inner diameter of a valve casing 1. A valve member 4 is provided with one or a plurality of guiding sections 41 projected from its circumference toward an upstream side. The guiding sections 41 are stored in a clearance between an inner circumferential surface 1a of the valve casing 1 and an outer circumferential surface 20a of the valve seat 20. Accordingly, it is possible to form the check valve compact and in particular, the guiding sections 41 for the valve 4 stored between the outer circumferential surface 20a of the valve seat 20 and the inner circumferential surface 1a of the valve casing 1 are extended along both the outer circumferential surface 20a of the valve seat 20 and the inner circumferential surface 1a of the valve casing 1 or exclusively along the outer circumferential surface of the valve seat 20. With such an arrangement as above, a sliding motion of the valve member 4 is stabilized and a smooth operation of the check valve can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a check valve.

[0002]

2. Description of the Related Art Conventionally, various types of check valves have been known, and the one shown in FIG. −
No. 61532). In this check valve, a ring-shaped valve seat 102 is arranged in a valve casing 101 forming a fluid path, and a stopper 103 is provided downstream of the valve casing 102. A valve is provided between the valve seat 102 and the stopper 103. The body 104 is slidably arranged. The valve body 104 includes a plate portion 105 that comes into contact with the valve seat and closes the flow path thereof, and a plurality of guide pieces 107 provided on the outer periphery of the plate portion 106. The guide piece 107 is a protruding piece 108 extending from the plate portion in the radial direction.
And a guide portion 109 extending downstream from the projecting piece 108.
And The guide portion 109 is guided by the inner peripheral surface of the valve casing 101 in a state in which the guide portion 109 does not immediately come apart,
The valve body 104 can slide without tilting. In the description of the present application, the terms upstream and downstream are used based on the normal flow direction of the fluid unless otherwise specified.

In this check valve, as shown by the solid arrow in the drawing, when the fluid is flowing normally, the flow from the valve seat 102 hits the plate portion 105 of the valve body 104 and the valve body 10
Slide 4 downstream. The fluid flows downstream from the space between the guide pieces 107, and the valve element 104
When the tip of the abutment comes into contact with the stopper 103, the sliding is stopped. On the other hand, as shown by the dotted arrow in the figure, when the fluid flows backward, the valve element 104 is moved upstream (in the case of reverse flow, downstream) until the fluid hits the plate portion 105 and contacts the valve seat 102. Side) to block the flow path and prevent backflow.

The gist of the invention according to Japanese Patent Application Laid-Open No. 8-61532 is that the provision of the guide piece 109 allows
4 to prevent the valve 104 from catching in the valve casing 101 and not moving. However, the guide portion 109 is guided without being separated from the inner peripheral surface of the valve casing 101 immediately, and a slight clearance is required between the two. Therefore, unless the guide portion 109 is extended to a sufficient length, the valve body cannot be completely prevented from being caught.

This will be described in more detail with reference to FIG. FIG. 5 is an explanatory diagram drawn along a cross section taken along line XX in FIG. 4B. In this figure, the solid line 109
a shows the case where the guide portion is long, and the dotted line 109b
Indicates a short case, which is the same as other conditions such as the clearance between the valve case 101 and the diameter of the plate portions 105a and 105b. As is clear from this figure,
The longer the guides 109a and 109b, the smaller the inclination.
The guide portion 109a comes into contact with the valve case 101, and further inclination is prevented. Therefore, short guide 1
In the case of 09b, the angle between the guide part 109b and the valve case 101 when it comes into contact with the valve case 101 becomes large, and as a result, the tip of the guide part 109b is easily caught on the valve case 101.

As described above, if the guide portion 109 is not extended to a sufficient length, it is impossible to completely prevent the valve body from being caught. Therefore, if the guide portion 109 is extended for a long time, the check valve is correspondingly increased. Becomes large (the length from the valve seat 102 to the stopper 103), and it is impossible to cope with downsizing.

[0007]

The present invention differs from the above-mentioned conventional check valve in that the guide portion of the valve element is directed toward the valve seat, and the guide portion is provided between the valve seat and the valve casing. By accommodating the check valve, the entire check valve can be made compact, and the sliding stability of the valve element can be improved to solve the above-mentioned problem.

[0008]

A check valve according to a first aspect of the present invention includes a valve casing 1 forming a fluid path, a tubular valve body contact member 2 provided in the valve casing 1, and a valve. A stopper 3 provided in the valve casing 1 downstream of the body contact body 2 and a valve body 4 slidably disposed between the valve body contact body 2 and the stopper 3 are provided. The following configuration is adopted for the object. That is, the valve body abutment 2 protrudes downstream and has a smaller outer diameter than the inner diameter of the valve casing 1.
0 is provided. The valve body 4 includes one or a plurality of guide portions 41 protruding upstream from the periphery thereof. Guide 41
Are the inner peripheral surface 1a of the valve casing 1 and the outer peripheral surface 20 of the valve seat 2.
a.

As described above, the guide portion of the valve body 4 is provided on the upstream side of the valve body 4, and the guide portion 41 is provided on the outer peripheral surface 20 a of the valve seat 20.
The check valve can be made compact irrespective of the length of the guide portion 41 by accommodating it in the gap between the valve casing 1 and the inner peripheral surface 1a of the valve casing 1. Further, the guide portion 41 of the valve element 4 accommodated between the outer peripheral surface 20a of the valve seat 20 and the inner peripheral surface 1a of the valve casing 1 is connected to the outer peripheral surface 20a of the valve seat 20 and the inner peripheral surface 1a of the valve casing 1. In this case, the sliding of the valve element 4 can be more stable and the check valve can be operated more smoothly than in the related art by using the outer peripheral surface of the valve seat 20 or both of them. Therefore, as in the prior art, the valve body 4
However, there is no longer any possibility of being caught in the valve casing 1.

The check valve according to the second invention of the present application is the check valve according to the first invention of the present application, wherein the guide portion 41 is
It is a cylindrical part extending from the periphery of the valve body 4 to the upstream side.

The guide portion 41 is hardly deformed due to the cylindrical shape. For this reason, it is possible to obtain smooth sliding of the valve body 4 for a long period of time.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is a schematic longitudinal sectional view of a check valve according to an embodiment, FIG. 2 (A) is a schematic longitudinal sectional view of a valve element 4 of the check valve, and FIG. 2 (B) is this valve. It is a rear view of the body 4. The check valve includes a valve casing 1 that is a copper pipe having a circular cross section, a valve body contact member 2 fixed in the valve casing 1, and a valve casing 1 that is formed by squeezing a part of the valve casing 1. And a valve body 4 disposed in the valve casing 1 so as to be slidable between the valve body contact body 2 and the stopper 3.

As shown in FIGS. 2A and 2B, the valve body 4 has a disk-shaped plate portion 45, a plurality of projecting pieces 48... 48 extending radially from the plate portion 45, and Piece 48 ...
And a cylindrical guide portion 41 which is supported by the valve 48 and protrudes upstream (to the right in FIG. 1) of the fluid flow s in the valve casing 1.

In this embodiment, three projecting pieces 48 are formed and extend in three directions. This projecting piece 4
The gaps 44... Between the pipes 8... 48 serve as portions through which the fluid in the valve casing 1 passes when the valve is opened.

The cylindrical guide portion 41 forms the maximum diameter portion of the valve body 4. The outer diameter R of the guide portion 41 is smaller than the inner diameter Rs of the valve casing 1. That is, the outer diameter of the guide portion 41 is formed smaller than the inner diameter of the valve casing 1 because a clearance for sliding the valve element 4 is required.

The projection length L of the guide portion 41 is optimally set such that a value (ratio) obtained by dividing the outer diameter R by the projection length L is about 0.46. For example, in consideration of the inner diameter of the valve casing 1, the outer diameter R is set to about 6.45 cm.
In this case, it is desirable that the protrusion length L be about 3 cm. When the guide portion 41 has such dimensions, it is appropriate that the diameter of the plate portion 45 is about 3.8 cm, and the width w of each protruding piece 48 is about 1.5 cm.
The valve body 4 is suitably made of a SUS material such as SUS304. However, such a material and a ratio for determining each of the above dimensions or dimensions can be changed as necessary.

The valve body contact body 2 is a cylindrical body made of brass, and as shown in FIG.
2 are formed. The outer diameter of the valve body abutment 2 (maximum diameter R
s) is substantially the same as the inner diameter of the valve casing 1. After the valve body abutment 2 is fitted inside the valve housing 1,
The valve housing 1 is fixed to the valve housing 1 by being squeezed so as to enter the recess 22. 11 is
3 shows a fitting portion of the valve housing 1 to the concave portion 22.

The valve body abutment 2 has a hollow portion 2a inside thereof.
The fluid in the valve housing 1 is caused to pass through. The valve abutment 2 is located on the downstream side of the fluid flow s (FIG. 1).
On the rear end face 2b facing the left side of FIG.
Are formed.

The outer diameter Rt of the cylindrical valve seat 20 is determined by the valve body 4
Is substantially the same as the inner diameter r of the guide portion 41 (FIG. 2B). However, the clearance is smaller than the inner diameter r because a clearance for sliding the valve element 4 is required. With this configuration, a gap k is formed between the outer diameter Rt of the valve seat 20 and the inner peripheral surface 1a of the valve casing 1. The gap k accommodates the guide part 41 of the valve body 4 as an accommodation part. The length of the entire check valve (the length in the direction along the fluid flow s) can be made compact by accommodating the guide portion 41 of the valve body 4 in the gap k.

The valve body 4 housed in the gap k
The dimensions of the guide portion 41 are set so that the outer peripheral surface 41a can be along the inner peripheral surface 1a of the valve casing 1 and the inner peripheral surface 41b can be along the outer peripheral surface 20a of the valve seat 20 (the valve body). 4
However, the outer diameter of the valve seat 20 and the dimensions of the valve element 4 are set so that the valve body 4 has a degree of freedom along both the valve casing 1 and the valve seat 20).

With such a setting, when the valve element 4 slides, the guide portion 41 of the valve element 4 moves to the inner peripheral surface 1 of the valve casing 1.
a and the valve body 4 are guided by both the
Can perform more stable sliding. That is, since the valve body 4 is guided on both the outside and the inside, the valve body 4 can slide smoothly without being greatly inclined. For this reason, even if the guide part 41 of the valve element 4 is not formed to be longer than before, sliding can be performed much more stably than before. Therefore, it is possible to obtain the compactness of the check valve together with the reliable operation thereof.

The sliding of the valve body 4 will be described in detail. The two-dot chain line in FIG. 1 shows the valve element 4 when displaced to the most downstream side in the sliding section. As shown in FIG. 1, the maximum displacement of the valve body 4 toward the downstream side is defined by the stopper 3. That is, the stopper 3 hits,
The valve body 4 is not moved further downstream. When the valve element 4 is located at the two-dot chain line, the check valve is completely opened.
Conversely, when the valve element 4 is located at the most upstream position indicated by the solid line, that is, the plate portion 45 of the valve element 4 abuts against the valve seat 20 of the valve element abutment 2, the hollow portion 2a is closed, and the check valve is closed. It will be in the state that was done. As shown in FIG. 1, even when the valve element 4 is maximally displaced downstream, not all the guides 41 are separated from the valve seat 20 but a part of the guides 41 Contact body 2
Of the valve casing 1 and the inner peripheral surface 1a of the valve casing 1. That is, the sliding of the valve body 4 is guided by the outer peripheral surface 20a of the valve seat 20 and the inner peripheral surface 1a of the valve casing 1 in the entire sliding section.

3 (A) to 3 (C), the inner peripheral surface 1a of the valve casing 1, the guide portion 41 of the valve body 4, and the outer peripheral surface 20a of the valve seat 20 of the valve body abutment 2 will be described. The setting of each clearance will be described. 3A to 3C.
Is a cross sectional view of the check valve, but in order to avoid complication of the drawing, the valve casing 1, the guide portion 41 of the valve body 4,
In addition, the valve seat 20 of the valve body abutment is drawn as a circle (curve) without a thickness, and the dimensional difference of each member is emphasized more than actually.

In the embodiment shown in FIGS. 1 and 2, as shown in FIG. 3A, the outer peripheral surface 41a of the guide portion 41 of the valve body 4 extends along the inner peripheral surface 1a of the valve casing 1. Also, such that the inner peripheral surface 41b is along the outer peripheral surface 20a of the valve seat 20,
The outer diameter of the valve seat 20 and the dimensions of the valve body 4 are set. With such a setting, the sliding of the valve element 4 is guided by both the valve casing 1 and the valve seat 20.

On the other hand, in addition to the above setting, as shown in FIG. 3B, the guide portion 41 of the valve body 4
It is also possible to carry out the present invention only along 0a and not in contact with the valve casing 1. That is, the inner peripheral surface 41b of the guide portion 41 of the valve body 4 comes into contact with the outer peripheral surface 20a of the valve seat 20, but the outer peripheral surface 41a of the guide portion 41 of the valve body 4 has an inner peripheral surface 1a of the valve casing 1. The dimensions of each part are set so that they do not touch each other. In this case, since the outer diameter Rt of the valve seat 20 is smaller than the inner diameter Rs of the valve casing 1,
Assuming that the length L of the guide 41 is constant, the ratio of the length L of the guide 41 to the outer diameter of the valve seat 20 is larger than the ratio of the length L of the guide 41 to the inner diameter of the valve casing 1. This has the advantage that the stability of sliding of the valve body 4 is increased by that much. Of course, even with the setting shown in FIG.
As in the prior art, the valve body 4 is provided only on the inner peripheral surface 1a of the valve casing 1.
There is an advantage of the above difference in the ratio as compared with the case where the guidance is performed, but the setting shown in FIG. 3B makes the ratio difference larger than the case shown in FIG. Can be more effective.

In general, for an annular member, the outer diameter is easier to machine than the inner diameter.
The outer peripheral surface 2 of the valve seat 20 of the valve body contact body 2 is
0a makes it easier to obtain processing accuracy. Further, the valve body abutment 2 is formed separately from the valve casing 1 at the time of manufacture, and compared with the valve casing 1 which forms a fluid flow path,
In addition to being a small member and being formed of a material such as brass, the inner peripheral surface 1a of the valve casing 1 is
The outer peripheral surface 20a of the valve seat 20 of the valve body abutment 2 is easier to process and more easily obtains accuracy. Therefore, from this point as well, it is more advantageous to use only the valve seat 20 of the valve body contact body 2 as the guide surface for sliding the valve body 4 as described above.

However, as shown in FIG. 3 (C), the guide portion 41 of the valve element 4 may be configured so as to extend only along the valve casing 1 and not to contact the valve seat 20. In this case, since the guide portion 41 of the valve body 4 is guided only by the valve casing 1a, as in the case of the conventional check valve, if the stable sliding of the valve body 4 is to be ensured, the guide portion 41 is required.
Requires a larger protruding length L, but the guide portion 41 of the valve body 4 extends upstream of the flow s, that is, toward the valve body contact member 2, and the inner peripheral surface 1a of the valve casing 1 and the valve seat By housing the guide portion 41 in the gap k between the outer peripheral surface 20a of the check valve 20 and the outer peripheral surface 20a, the check valve can still obtain compactness. However, FIG.
(B) (particularly, the setting shown in FIG. 3 (B)) is more stable even when the length L of the protrusion of the guide portion 41 is reduced.
It is also superior in securing compactness. 3 (B) and 3 (C), the configuration other than the dimension setting is the same as that of the embodiment shown in FIGS. 1 and 2 as in FIG. 3 (A).

In the embodiment shown in FIGS. 1 and 2, the guide portion 41 of the valve body 4 is cylindrical. However, what is necessary is just to extend to the upstream side of the flow s of the fluid,
For example, the present invention can be implemented even if it adopts the same configuration as the guide portion 109 of the valve body of the conventional check valve shown in FIG. However, as in the embodiment shown in FIGS. 1 and 2, it is advantageous that the guide portion 41 of the valve element 4 is formed in a cylindrical shape, because the shape is stable. Therefore, the embodiment shown in FIG. 1, FIG. 2, or FIG. 3 is more effective in preventing the valve body 4 from being caught.

[0029]

According to the first embodiment of the present invention, since the guide portion of the valve body is accommodated on the valve seat side, the check valve can be made compact. In addition, the valve body is stable and does not stop operating due to being caught. Therefore, from such a viewpoint, the check valve can be smoothly operated without enlarging the check valve. In addition, it is possible to easily manufacture the valve seat by exclusively guiding the sliding of the valve body to the valve seat which can easily secure the accuracy. Therefore, in this case, the production efficiency can be significantly improved.

By implementing the second aspect of the present invention, the guide portion of the valve body is hardly deformed, and the effects of the first aspect of the present invention can be obtained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a check valve according to one embodiment of the present invention.

FIG. 2A is a schematic longitudinal sectional view of a valve element of the check valve, and FIG. 2B is a rear view of the valve element.

FIGS. 3A, 3B, and 3C are explanatory views of clearances of respective parts of the check valve.

FIG. 4A is a schematic vertical sectional view of a conventional check valve;
(B) is a rear view of the valve body.

FIG. 5 is an explanatory diagram showing a behavior of a valve body of the conventional check valve.

[Explanation of symbols]

1 ... valve casing, 1a ... inner peripheral surface (of valve casing),
2 ... Valve abutment, 3 ... Stopper, 4 ... Valve, 20 ... Valve seat, 21 ... Guide, 41 ... Guide

Claims (2)

[Claims] 1. A valve casing (1) forming a fluid path, and a cylindrical valve body contact body (2) provided in the valve casing (1).
And the valve casing (1) on the downstream side of the valve body abutment (2).
A check valve provided with a stopper (3) provided therein and a valve body (4) slidably disposed between the valve body abutment (2) and the stopper (3). The body abutment (2) projects downstream and the valve casing
The valve seat (20) having an outer diameter smaller than the inner diameter of (1), the valve body (4) includes one or more guide portions (41) protruding upstream from the periphery thereof, and The check valve is characterized in that the portion (41) is accommodated in a gap between the inner peripheral surface (1a) of the valve casing (1) and the outer peripheral surface (20a) of the valve seat (2). . 2. The check valve according to claim 1, wherein the guide portion is a cylindrical portion extending from the periphery of the valve body to the upstream side.