JPH0645108Y2 - Check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a check valve, and more specifically, a check valve has a valve body having a seal portion and a guide portion, and the seal portion is pressed against a valve seat. By integrally forming the elastic part with the elastic synthetic resin body and attaching this valve body to the valve body with a retaining ring, it is possible to reduce the number of parts and manufacture at a low cost, and to make the liquid flow in a certain direction. On the other hand, the present invention relates to a check valve configured such that the valve body is easily opened.

[Prior Art] Generally, in a pressure fluid circuit, a check valve is used alone or in a fluid device such as a pump or an actuator to prevent backflow of fluid to a pipeline. That is, the check valve has a function of allowing the fluid flow in only one direction in the conduit and blocking the flow in the opposite direction.

FIG. 1 shows a check valve according to the prior art. The check valve 2 pivotally supports one end of a plate-shaped valve body 6 so that the check valve 2 can be opened and closed with respect to a valve opening 4 communicating with a fluid passage, so that the check valve 2 can be used for fluid flow from one direction. On the other hand, the valve body 6 opens due to the pressure, and the valve body 6 is pressed against the inclined opening surface 4a of the valve opening 4 against the flow from the other direction, and the flow of the fluid is shut off. is doing.

Further, as a modification of this type of check valve, there is one using a spherical valve body. This is shown in FIG. In this case, one valve opening 8a defined inside the check valve 7 is selected to be smaller than the diameter of the spherical valve body, and the tapered surface 10 is provided on the other valve opening 8b side.
To form a seat for the spherical valve body 12. In this case, the spherical valve body 12 in the check valve 7 is pressed against the tapered surface 10 by the flow of the fluid in the direction of the arrow, so that the flow of the fluid in one direction can be blocked.

However, in such a check valve, since the valve body itself is displaced by gravity, the mounting posture when the valve is arranged is restricted. Therefore, this kind of valve body cannot be arranged at a desired position.

Further, there is a check valve that employs a structure in which a plate-shaped valve body and a coil spring are combined. This is shown in FIG.

In the check valve 13, as shown by the arrow, when the fluid tries to flow from one direction, the fluid pressure pushes the valve body 16 against the elastic force of the coil spring 14, result,
Since the valve body 16 is displaced away from the valve port 18, the fluid can flow through the valve body. On the other hand, when there is no fluid flow or when the fluid flows from the other direction as indicated by the broken line arrow, the valve body 16 is pressed against the valve opening 18 by the elastic force of the coil spring 14 and the fluid pressure. To shut off the fluid passage.

In such a check valve 13 according to the related art, since the coil spring 14 is used, when the fluid pressure is set to be slightly larger than the elastic force of the coil spring 14 and the fluid pressure flows, It has been pointed out that chattering easily occurs when there is a pressure fluctuation due to pulsation or the like, and thus the chattering causes the circuit to open and close, resulting in unstable operation.

Furthermore, a check valve according to another prior art is shown in FIG. That is, in this conventional technique, a lip 24 made of an elastic body such as rubber is arranged in the wall portion of the chamber 22 communicating with the fluid passage inside the check valve 20 so as to be inclined in one direction. It works as a check valve body. That is,
In such a check valve 20, the lip 24 is bent by the pressure of one fluid so as to be separated from the wall surface 26, a gap is formed between the two, and the fluid is conducted between these. On the contrary, when the fluid flows from the other direction, the lip 24 strongly presses against the wall surface 26, so that the flow can be blocked.

However, the check valve 20 according to this conventional technique has a drawback that the pressure resistance cannot be increased because the lip 24 is pressed against the wall surface 26 to exert a check effect. It has also been pointed out that if the rigidity of the lip is high when the fluid flows, a fluid resistance is generated and the pressure loss in the check valve 20 becomes a problem from the viewpoint of the entire system.

[Problems to be Solved by the Invention] In order to overcome the above-mentioned inconveniences of the present invention, there is provided a cylindrical body having a sealing function for a valve body, and an elastic force for pressing the cylindrical body in the sealing direction. It is formed integrally with a ring body that has a valve, which prevents the occurrence of vibrations associated with the opening / closing operation of the valve, and at the same time makes it possible to reduce the pressure loss in the valve section when the pipe is flowing, and at the same time An object of the present invention is to provide a non-return valve that can be manufactured at a low price with various configurations.

[Means for Solving the Problems] To achieve the above object, the present invention provides a valve body including an elastic body having a fluid passage therethrough and a chamber communicating with the fluid passage. A columnar body having an annular seal portion that abuts the stepped portion to close the fluid passage and a plurality of hemispherical projections provided on the peripheral wall surface at a predetermined interval, and an elastic force is applied to the columnar body. A ring body, and a pair of tongues provided between the columnar body and the ring body, and defining a semi-arcuate groove along the shape of the ring body, having a retaining ring in the chamber. And a valve body fixed in place, and when the cylindrical body pressed by the pressure fluid introduced through the fluid passage is displaced by the elastic force of the ring body, the seal portion separates from the step portion. And the hemispherical projection of the cylinder defines a chamber The pressure fluid from the gap between the wall portion which is defined in contact with the wall and the cylinder of Rububodei characterized in that the flowing.

[Embodiments] Next, preferred embodiments of the check valve according to the present invention will be given and described in detail below with reference to the accompanying drawings.

In FIG. 5, reference numeral 50 indicates a check valve according to the present invention, and the check valve 50 includes a valve body 52, a valve body 54 and a stop ring 56.

The valve body 52 has a cylindrical first shape having a predetermined length.
It is composed of a tubular body 58, a second tubular body 62, and a nut portion 60 that is bulged and formed between the first tubular body 58 and the second tubular body 62. In this case, the first tubular body 58, the nut portion 60 and the second tubular body 62 are integrally formed to form the valve body 52. As shown in FIG. 6, a passage 64 is formed in the valve body 52 so as to extend in the axial direction thereof, and a chamber 66 communicates with the passage 64 via a valve port 65. In this case, the chamber 66 is open to the outside from the second cylindrical portion 62. Further, an annular groove 68 is provided at a predetermined position on the inner wall of the second cylindrical portion 62 that defines the chamber 66. The first cylinder 58 and the second cylinder 62 are provided with threaded portions 58a and 62a on the outer peripheral portions for connecting the conduits, respectively.

Next, as shown in FIGS. 7 and 8, the valve main body 54 is basically composed of a columnar body 70 and a ring body 72 integrally molded of an elastic synthetic resin body. . That is, a seal portion 74 having an annular shape is formed to project at one end of the columnar body 70, and a plurality of hemispherical projections 76a to 76c are formed on the peripheral wall surface thereof at a predetermined interval. On the other hand, a pair of tongue pieces 77 is extended from the other end side of the cylindrical body 70, and the tongue pieces 77 are connected to the ring body 72. As a result, the columnar body 70 and the ring body 72 have a semicircular groove portion 78.
And the groove 80 will be defined. In this case, the ring body 72 includes a first ring body 72a, a second ring body 72b, and a third ring body 72c. As can be easily understood from FIG. 8, the second ring body 72b is formed to be thicker than the first ring body 72a. The first ring body 72a and the second ring body 72b are substantially connected by a pair of tongue pieces 94. Therefore, the groove portions 90 and 92 are defined by the presence of the pair of tongue pieces 94. In this case, the pair of tongue pieces 77 and 94 are 90 ° apart so as to be orthogonal to each other.
It is displaced. Next, an annular groove 96 is formed between the second ring body 72b and the third ring body 72c.
A retaining ring 56 is fitted between the annular body 68 and the annular groove 68 defined in the second tubular body 62 to mount the valve body 54 on the valve body 52. As can be easily understood from FIG. 6, a gap is defined between the wall portion that defines the chamber 66 and the outer peripheral surface of the cylindrical body 70 of the valve body 54. As will be described later, this gap is formed. Functions as a fluid passage.

Therefore, as shown in FIG. 5, the snap ring 56 is formed by bending or curving a rod-shaped metal material having a high elastic force, and has a substantially Ω shape. That is, a shape is adopted in which both ends are curved in a U shape, and portions extending from the both ends are curved in a C shape so as to bulge each other, and then the connection ends. Therefore, the portion that bulges in the C shape fits into the annular groove 96 of the ring body 72. Here, the ends of the U-shaped portion and the C-shaped portion of both ends of the retaining ring 56 are fitted into the annular groove 68, and the valve body 54 is fixed to the valve body 52 by three-point support. In this case, a gap is defined between the valve body 52 and the valve body 54. In the figure, reference numeral 98 indicates a passage that penetrates the ring body 72.

The check valve according to the present invention is basically constructed as described above. Next, its operation and effect will be explained.

First, in the check valve 50, the annular groove 96 of the valve body 54 is
The retaining ring 56 is fitted to the valve body 54, and the valve body 54 is pushed into the chamber 66 to be attached to the valve body 52 by the retaining ring 56. At this time, the elastic force is generated by the tongues 77 and 94, so that the cylindrical body 70
Is pressed against the step portion on the side of the passage 64 that communicates with the chamber 66.

In such a structure, fluid pipe lines (not shown) are connected to the first cylinder body 58a and the second cylinder body 62a, respectively. When the fluid in the direction of the arrow A is caused to flow from the passage 64, the fluid pressure presses the columnar body 70 against the elastic force generated by the tongues 77 and 94. Displace in the direction. In addition,
In this case, the tongues 77 and 94 are arranged in a positional relationship where they cross each other. Therefore, when the columnar body 70 is pressed by the pressure of the fluid from the direction of the arrow A, the tongue 77 connected to the columnar body 70 tries to tilt toward the groove 78 or the groove 80 side,
On the other hand, the tongue piece 94 tends to tilt toward the groove 90 or the groove 92 side. However, since the tilting directions are orthogonal to each other, the tilting motion is not substantially caused.

When the columnar body 70 is pressed in this manner, the groove portion 78,
Since 80, 90 and 92 are defined to be large enough, the protrusions 76a to 76c of the cylindrical body 70 are displaced in the direction of arrow A while slidingly contacting the wall defining the chamber 66 with point contact. , Seal part
74 is separated from the pressure contact portion. At this time, the projections 76a to 7
6c is made of an elastic material, and has a point contact with the wall defining the chamber 66, so that a substantially negligible contact resistance is generated. Therefore, the columnar body 70 is easily displaced under a slight frictional resistance and the function as a check valve is surely performed. As a result, the chamber 66 and the passage 64 are communicated with each other, whereby the fluid passes through the valve opening 65 and further passes through the side wall of the cylindrical body 70, and the groove portion 78,
It flows into the passage 98 of the ring body 72 through the groove portion 80, the groove portion 90, and the groove portion 92, or flows from between the circumferential portion of the ring body 72 and the side wall surface of the chamber 66. The direction opposite to the arrow A direction, that is,
When the fluid is introduced from the passage 98 side, the columnar body 70 is moved to the arrow A
The seal portion 74 closes the passage 64 by being pressed in the direction opposite to the direction.

[Advantage of the Invention] As described above, according to the present invention, since the seal portion of the valve body and the portion having elasticity are integrally formed by the synthetic resin body, the number of components of the check valve itself is reduced. It can be extremely small. Further, since the coil spring is not used, there is an advantage that the occurrence of oscillation or the like can be prevented. Furthermore, since the rigidity of the part with elastic force against deformation is reduced by the definition of the semi-circular groove, the valve is easy to open, resulting in excellent responsiveness and reverse flow during fluid flow. The effect that the pressure loss in the stop valve can be reduced can be obtained.

Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to this embodiment.
It goes without saying that various improvements and design changes can be made without departing from the scope of the present invention.

[Brief description of drawings]

1 to 4 are cross-sectional views showing the structures of different check valves according to the prior art, FIG. 5 is an exploded perspective view of the check valve according to the present invention, and FIG. 6 is a reverse view according to the present invention. FIG. 7 is a sectional view of a check valve, FIG. 7 is a sectional view of a valve body incorporated in a check valve according to the present invention, and FIG. 8 is a partially cutaway perspective view of a valve body incorporated in a check valve according to the present invention. FIG. 9 is a side view of a valve body incorporated in a check valve according to the present invention. 50 ... Check valve, 52 ... Valve body 54 ... Valve body, 56 ... Retaining ring 68 ... Annular groove, 70 ... Cylindrical body 72 ... Ring body, 74 ... Seal part 76 ... Hemispherical protrusion, 77 ... Tongue pieces 78, 80 , 90, 92 ... Groove, 94 ... Tongue

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-99725 (JP, A) real-open Sho-48-91537 (JP, U) real-open Sho-52-77037 (JP, U) real-open Sho-48- 69135 (JP, U) Actual opening Sho 49-19330 (JP, U) Actual opening Sho 53-162428 (JP, U) Actual opening Sho 17-12940 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A valve body made of an elastic body defining a fluid passage therethrough and a chamber communicating with the fluid passage, and an annular seal portion and a peripheral wall surface for abutting a step portion of the valve body to close the fluid passage. A columnar body having a plurality of hemispherical protrusions provided at a predetermined distance from each other, a ring body that applies an elastic force to the columnar body, and provided between the columnar body and the ring body, A pair of tongues defining a semi-circular groove along the shape of the ring body, and a valve body fixed to the chamber via a retaining ring, and introduced through the fluid passage. When the cylindrical body pressed by the applied pressure fluid is displaced against the elastic force of the ring body, the seal portion is separated from the step portion and the hemispherical projection of the cylindrical body defines a chamber of the valve body. The wall portion and the cylindrical body defined by contacting the wall portion Check valve the pressure fluid from the gap, characterized in that the flowing.