JPH0714707Y2 - Check valve - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to a check valve with a built-in hose.

b. Prior Art Conventionally, a check valve 52 built in a hose 51 as shown in FIG. 2 is used for a negative pressure type booster of an automobile or the like. The check valve 52 of this type includes a valve body 55 supported by a stem 54 having a retainer 53, and the valve body 55 is constantly urged by a return spring 57 provided in a valve chamber 56 to maintain a valve body 58.
Is abutted against the valve seat 59 of the. Therefore, the check valve 52 is provided with the fluid from the inlet port 60 of the valve body 58 to the outlet port 62 of the cap 61 only when the valve body 55 is opened by the pressure of the fluid in the hose 51 acting from the opposite direction. Is configured to spill into.

c. Problem to be Solved by the Invention However, in the above-described conventional check valve 52, since the inner peripheral wall of the valve body 58 and the insertion portion of the cap 61 are joined by ultrasonic welding, the welding is performed during welding. Burrs may occur. If the generated burr is in the valve chamber 56, the check valve
During operation of 52, the burr is generated by the valve body 55 and the valve seat 59 of the valve body 58.
There is a case where it moves between the sheet and the sheet and adheres to the sheet surface. If the burr adheres to the sheet surface, airtight leakage may occur, so that work for removing the burr is required, work efficiency cannot be improved, and the cost of parts is increased.

The present invention has been made in view of such an actual situation, and an object thereof is a structure that does not cause burrs and is excellent in workability, and that uses a snap fit to connect a valve body and a cap. Another object of the present invention is to provide a non-removable check valve with a strong fastening in which the fastening portion does not come off.

d. Means for Solving the Problems In order to solve the problems of the above-mentioned prior art, in the present invention, a valve main body having a valve chamber and one end of the valve main body by partially inserting the valve main body into the valve main body. A fluid that is provided with a cap that closes the opening, and causes the valve element housed in the valve chamber of the valve body to abut against the valve seat of the valve body by the urging force of the return spring, and flows out from the inlet port of the valve body. In a check valve with a built-in hose that opens the valve body only by the pressure of the above, any one of a convex portion and a concave portion that are fitted to the inner peripheral surface of the valve body and the outer peripheral surface of the insertion portion of the cap. One of them is provided, and a protruding strip is provided at the tip of the valve body, and an axial circumferential groove that engages with the protruding strip is provided at the cap, and the insertion portion of the cap is press-fit into the valve body. Before With fitted between the convex portion and the concave portion, and configured to connecting the said valve body cap by engaging the projection piece in the circumferential groove.

e. Embodiment Hereinafter, the present invention will be described in detail based on an illustrated embodiment.

FIG. 1 shows an embodiment of a check valve according to the present invention. The check valve 1 in the figure is of a type that is built in a hose 2, and has a cylindrical valve body 3 and one end opening 5 of the valve body 3 formed by press-fitting an insertion portion 4 into the valve body 3. The valve body 3 and the cap 6 are both made of a synthetic resin material. The inside of the valve body 2 is a valve chamber 7, and in the valve chamber 7, a poppet-shaped valve body 8 integrally formed of an elastic material such as a rubber sheet,
A stem 9 that supports the valve body 8 and a return spring 11 that constantly urges the valve body 8 toward the inlet pole 10 of the valve body 3 via the stem 9 are housed.

The valve body 8 is formed so that the outer diameter thereof is in contact with the valve seat 12 of the valve body 3, and a fitting hole 13 for fitting with the stem 9 is provided at the center thereof. The stem 9 has a substantially conical head portion 14 that is inserted into the inlet pole 10 of the valve body 3 and a retainer 15 that locks the return spring 11.
And a guide portion 17 that is inserted into the outlet port 16 of the cap 6 and slides along the inner wall surface of the outlet port 16, and the head portion 14, the retainer 15 and the guide portion 17 are integrally made of a synthetic resin material. Has been formed. The valve body 8 fitted into the head portion 14 via the fitting hole 13 is positioned and fixed between the head portion 14 and the retainer 15.

On the other hand, a concave groove 18 is provided along the circumferential direction on the inner peripheral wall surface 3a located on the one end opening 5 side of the valve body 3.
Further, on the outer peripheral surface of the insertion portion 4 of the cap 6, a flange-shaped ridge 19 that fits into the groove 18 is provided in a protruding manner.
The height of the ridge 19 is such that the cap 6 press-fitted has the valve body 3
It is formed in a size that does not come out relatively from the. In addition, the convex strip portion 19 is used when the cap 6 is fitted with the concave groove 18.
It is provided at an axial position where the circumferential groove 20 and the protruding strip 21 of the valve body 3 are fitted.

That is, a protruding strip 21 extending in the axial direction is provided at the tip of the valve body 3, and an axial circumferential groove 20 that engages with the protruding strip 21 is provided in the cap 6. Also, the strip
Reference numeral 21 denotes a wall thickness and a position for pushing inwardly so that the ridge 19 will not deform when the ridge 19 rides over the groove 18 and tries to come out after the cap 6 is press-fitted into the valve body 3. Is formed in.

In the check valve 1 having the above structure, when the fluid pressure difference before and after the valve body 8 becomes a predetermined pressure or more, the valve body 8 moves to the left side in the drawing against the urging force of the return spring 11 and is opened. Along with this, the valve seat 12 of the valve body 3 and the valve body 8 abutting against this
A gap is created between the inlet pole and the inlet pole
Fluid flows out of 10. When the fluid pressure difference becomes equal to or lower than a predetermined pressure, the urging force of the return spring 11 moves the valve element 8 to the right side in the drawing, and returns to the illustrated state.

The check valve 1 according to the present embodiment is configured such that the insertion portion 4 of the cap 6 is press-fitted into the valve body 3 and the ridge portion 19 is fitted into the groove 18 to be connected. As described above, it is not necessary to join by ultrasonic welding, and it is possible to prevent various adverse effects caused by the occurrence of burrs during welding.

In addition, the check valve 1 of the present embodiment is provided with the protruding strip 21 at the tip of the valve body 3 and the circumferential groove in the axial direction on the cap 6.
Since 20 is provided and the protruding strip 21 is engaged with the circumferential groove 20, it is possible to prevent the outer peripheral portion of the valve body 3 from expanding due to the engagement portion, and temporarily separate the valve body 3 and the cap 6. Even if force is applied, the engagement between the ridge portion 19 and the concave groove 18 does not come off.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, the groove 18 is formed in the valve body 3
Although the ridge portion 19 is provided on the cap 6 in addition to the above, the same effect can be obtained by reversing the location where the groove 18 and the ridge portion 19 are provided.
It is possible to exert an effect. Also, the groove 18 and the ridge
Instead of 19, a plurality of recesses and protrusions may be provided at corresponding positions at intervals in the circumferential direction.

f. Effect of the Invention As described above, the check valve according to the present invention is provided with either one of a convex portion and a concave portion that are fitted to each other on the inner peripheral surface of the valve body and the outer peripheral surface of the insertion portion of the cap. A protruding strip is provided at the tip of the valve body, and an axial circumferential groove that engages with the protruding strip is provided on the cap, and the insertion portion of the cap is press-fitted into the valve body to form the protrusion and the protrusion. Since the valve body and the cap are connected to each other by fitting the recessed portion and engaging the protruding strip with the circumferential groove, the valve body and the cap are superposed as in the conventional case. It does not need to be joined by sonic welding and can be used as a hose built-in type with excellent quality performance. In addition, the check valve of the present invention does not perform ultrasonic welding as in the conventional case, and therefore does not generate burrs during welding, thus eliminating the work of removing burrs, improving workability, and reducing parts cost. it can. Moreover, according to the check valve of the present invention, the engagement between the protrusion and the circumferential groove can prevent the outer peripheral portion of the valve body from expanding in diameter, so that a force for separating the valve body and the cap acts. However, there is no fear that the concavo-convex bond will be broken.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a check valve according to the present invention,
FIG. 2 is a sectional view showing a conventional check valve. DESCRIPTION OF SYMBOLS 1 ... Check valve, 2 ... Hose, 3 ... Valve body, 4 ... Valve body insertion part, 5 ... One end opening, 6 ... Cap, 7 ... Valve chamber, 8 ... Valve body, 9 ... Stem, 10 ... Inlet pole , 11
… Return spring, 12… Valve seat, 18… Concave groove, 19… Projection section, 20… Peripheral groove, 21… Projection piece.

Claims (1)

[Scope of utility model registration request] 1. A valve body having a valve body having a valve chamber, and a cap partially inserted into the valve body to close an opening at one end of the valve body, the valve body housed in the valve chamber of the valve body. In a check valve with a built-in hose in which the valve body is brought into contact with the valve seat of the valve body by the urging force of the return spring, and the valve body is opened only by the pressure of the fluid flowing out from the inlet port of the valve body. The inner peripheral surface of the valve body and the outer peripheral surface of the insertion portion of the cap are provided with either a convex portion or a concave portion that are fitted to each other, and a protruding strip is provided on the tip of the valve body on the cap. Is provided with an axial circumferential groove that engages with the protruding strip, and the insertion portion of the cap is press-fitted into the valve body to fit the convex portion and the concave portion, and the protruding strip is surrounded by the peripheral portion. To engage the groove A check valve which is characterized by being configured so as to connecting the said valve body cap by.