JPH10220613A - Valve casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve easing which can reduce the amount of water entering a valve without making a device larger. SOLUTION: An exhaust passage comprising an annular groove 40, a first communicating passage 41 and a second communicating passage 42 is formed in the outer periphery of a cylindrical member 38 sandwiched by an upper open end part of a body 22 and a cover member 23 to make an air room 28 in the body 22 communicate with the atmosphere. This can reduce the amount of pressurized water entering the body 22 from a high pressure cleaning machine without providing a cover for covering the outer periphery of' the cover member 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a casing of a valve device used for an air brake circuit of a vehicle or the like.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 4-51265 discloses a conventional technique of this kind. FIG. 4 shows a valve device (pressure reducing valve) described in this publication, and is indicated by 1 as a whole. A stepped hole 5 is formed inside the main body 2 having an input port 4 and an output port 6, and a large diameter portion 5 is formed.
The piston 9 is slidably inserted into the A and the middle diameter portion 5B. The piston 9 is formed as a stepped piston, and a seal ring 1 is provided at a step between the large diameter portion and the medium diameter portion.
1 is attached. The lid member 3 is screwed and fixed to the upper opening of the main body 2 via a lock nut 17, thereby defining an air chamber 8 inside the main body 2. A spring 10 is provided between the lid member 3 and the piston 9 in a preloaded state, and urges the piston 9 downward in the figure. A valve body 15 is disposed in the valve chamber 7 formed between the input port 4 and the output port 6. The valve body 15 is urged in the direction of the valve seat 12 by the valve spring 16, but is normally supported by the lower end of the piston 9 and is separated from the valve seat 12 as shown in the figure. However, when the pressure (air pressure) of the fluid introduced into the input port 4 exceeds a predetermined value, the guide rod 1 fixed integrally with the valve body 15
As the piston 9 moves upward along 3, the valve body 15 is seated on the valve seat 12. Thereby, the flow of the fluid between the input port 4 and the output port 6 is cut off.

The air chamber 8 is formed by an axial passage 18 formed linearly between the main body 2 and the cover member 3 and a radial passage 19 formed between the cover member 3 and the lock nut 17. The air is always communicated with the atmosphere through the exhaust passage.

[0004]

However, in many cases, this type of valve device 1 is mounted outside the vehicle body. Therefore, when the vehicle body is washed with a high-pressure washing machine or the like using pressurized water, water is discharged from an exhaust passage. Penetrates and this is the lid member 3
Easy to reach inside. That is, when pressurized water is received from the side of the valve device 1, the water easily enters the radial passage 19, and furthermore, the water rises in the axial passage 18 linearly, so that the water is You will invade. Then, since the water that has entered once has no passage to be discharged outside, it is stored inside the apparatus 1, and thus there is a possibility that the operation of the valve body 15 may be supported. Further, if water enters a fluid device connected to the input port 4 or the output port 6 of the valve device 1, there is a possibility that the operation of the fluid device may be supported.

On the other hand, in order to prevent water from the high pressure washer from entering the inside of the apparatus, it is conceivable to provide a cover for covering the outer periphery of the lid member. However, there is a problem that the outer shape of the device becomes large and the size of the entire device is increased.

The present invention has been made in view of the above problems, and has as its object to provide a casing of a valve device that can reduce intrusion of water into the inside without increasing the size of the device.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a main body having an input port and an output port, in which a valve device for controlling the flow of a fluid is provided between the input port and the output port. A lid member that covers the upper opening of the main body and is locked to the main body to form an air chamber in the main body; and a passage formed between the lid member and the main body and constantly communicating the air chamber with the atmosphere. Wherein the passage is formed to be bent, and the opening of the passage on the atmosphere side is formed below the upper end of the air chamber. Solved by the casing.

According to the present invention, a passage for constantly communicating the air chamber with the atmosphere is formed to be bent, and an opening of the passage on the atmosphere side is formed below the upper end of the air chamber. At this time, the possibility that the water pressurized by the high-pressure washing machine enters the air chamber can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pressure reducing valve applied to an embodiment of the present invention, and is indicated by reference numeral 21 as a whole. A stepped hole 25 is formed inside the main body 22 having an input port 24 and an output port 26, and a piston 29 is slidably inserted into the large diameter portion 25A and the medium diameter portion 25B. I have. The piston 29 is formed as a stepped piston, and has a seal ring 31 mounted on a step portion between the large diameter portion and the medium diameter portion. A lid member 23 is attached to an upper opening of the main body 22 via a tubular member 38 described later, whereby an air chamber 28 is defined inside the main body 22. The lower end of the lid member 23 overlapping the upper end of the main body 22 is formed as a hanging part 23a, and a plurality of claw parts 23b, 23b,.
However, by engaging with the flange portion 22 a of the main body 22, the lid member 23 is prevented from coming off with respect to the main body 22. At this time, the hanging part 23a and the main body 22
And the claw portion 23b and the flange portion 22 of the main body 22
Clearances S and T are formed between the main body 22 and the lid member 23 at the engagement position with a (see FIG. 2).

A spring 30 is provided between the lid member 23 and the piston 29 in a pre-loaded state, whereby the piston 29 is urged downward in the figure. Input port 2
A valve chamber 27 formed between the pressure chamber 4 and the discharge port 26 includes:
A valve body 35 is provided. The valve body 35 is urged in the direction of the valve seat 32 by the valve spring 36, but is normally supported by the lower end of the piston 29 and is separated from the valve seat 32 as shown in the figure. However, input port 24
When the pressure (air pressure) of the fluid introduced into the valve body becomes equal to or higher than a predetermined value, the piston 29 moves upward along the guide rod 33 fixed integrally with the valve body 35 so that the valve body 3
5 sits on the valve seat 32. This allows input port 2
The flow of fluid between 4 and the output port 26 is cut off.

Next, the cylindrical member 38 according to the present invention will be described with reference to FIGS.

FIG. 2 is an enlarged view of a portion A in FIG. In the present embodiment, the cylindrical member 38 is made of plastic, and is sandwiched between the main body 22 and the lid member 23. On the outer periphery of the cylindrical member 38, an exhaust passage including an annular groove 40, a first communication passage 41, and a second communication passage 42 is formed to be bent as shown in FIG. The annular groove 40 is formed over the entire outer periphery of the cylindrical member 38, and the first communication passage 41 communicates between the annular groove 40 and the atmosphere, and the second communication passage 42
Is formed so as to communicate between the annular groove 40 and the air chamber 28. The first communication passage 41 and the second communication passage 42 are formed so as to have different circumferential positions with respect to the annular groove 40. Also, the first and second communication passages 41, 42
Are formed at four locations at 90 degree intervals. Further, the opening on the atmosphere side of the exhaust passage, that is, the first communication passage 4
The lower end of 1 is formed below the upper end of the air chamber 28. The cylindrical member 38 is sandwiched between the main body 22 and the lid member 23 so as to be in close contact therewith. The communication between the air chamber 28 and the atmosphere is established by the annular groove 40 and the first and second communication passages 41, 42, and through the gaps S and T between the main body 22 and the lid member 23.

According to the present embodiment, the exhaust passage (the first communication passage 4) for communicating the air chamber 28 with the atmosphere outside the device 21 is provided.
1, the annular groove 40 and the second communication passage 42) are formed to be bent so that the length of the path is long, so that when the car is washed by the high-pressure washing machine, water flows between the main body 22 and the lid member 23. Even if they enter from the gaps S and T of the air chamber 28 through the exhaust passage. In particular, the water that has reached the annular groove 40 is transferred to the other first communication passage 4.
1 can be discharged downwards. Therefore, the possibility of water entering the inside of the main body 22 can be significantly reduced as compared with the related art. Further, since there is no need to cover the outer periphery of the lid member 23 with a cover body, it is possible to avoid an increase in the size of the entire apparatus.

Further, since the gaps S and T are formed so as to extend in the vertical direction by the hanging portion 23a, it is difficult for water to enter the gaps S and T even if pressurized water is received from the side of the device 21. Thus, the intrusion of water can be further prevented. The cylindrical member 38 includes the main body 22 and the lid member 23.
And water is prevented from entering the inside of the main body 22 from portions other than the first communication passage 41, the annular groove 40, and the second communication passage 42. Therefore, device 2
It is possible to prevent malfunction of the valve body 35 due to water infiltration into the inside and malfunction of fluid equipment connected thereto.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, in the above embodiment, the air chamber 28
First and second exhaust passages for communicating the air with the atmosphere.
As shown in FIG. 3, the communication passages 41 and 42 are formed at four locations at intervals of 90 degrees. However, it is of course possible to change the intervals and the number, for example, three at 120 degrees. Also in this case, if the first and second communication passages are formed at positions different from each other in the circumferential direction with respect to the annular groove, the same effect as described above can be obtained.

In the above embodiment, the cylindrical member 38 is made of plastic, but may be made of metal or hard rubber instead. Also in this case, it is necessary to ensure sufficient adhesion so that water does not permeate at the interface between the main body and the lid member, and to prevent communication of air other than in the exhaust passage. Also, omitting the cylindrical member 38,
Even if the annular groove and the first and second communication passages are formed on the outer peripheral surface of the upper opening end of the main body or the inner peripheral surface of the lid member, the same effect as described above can be obtained. In addition, the exhaust passage including the annular groove 40 and the first and second communication passages 41 and 42 as in the above-described embodiment may have another shape. Also in this case, the exhaust passage may be formed to be bent, and the opening of the passage on the atmosphere side may be formed below the upper end of the air chamber.

Further, in the above embodiment, the description has been made using the pressure reducing valve as the valve device. However, the present invention can be applied to other valve devices, for example, a pressure regulator (governor). Further, the present invention is applicable not only to a valve device used in a pneumatic circuit but also to a valve device used in a hydraulic circuit.

[0020]

As described above, according to the casing of the valve device of the present invention, the passage for constantly communicating the air chamber with the atmosphere is formed to be bent, and the opening of the passage on the atmosphere side of the air chamber is formed. Because it is formed below the upper end,
When the vehicle is washed, the possibility that water pressurized by the high-pressure washing machine enters the air chamber can be reduced without increasing the size of the entire device, such as covering the outer periphery of the lid member with a cover body. Therefore, it is possible to prevent a malfunction of the valve body due to water infiltration into the inside of the device and a malfunction of a fluid device connected thereto.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a perspective view showing a combined state of a cylindrical member and a main body according to the present invention.

FIG. 4 is a side sectional view showing the whole of a conventional valve device.

[Explanation of symbols]

 Reference Signs List 22 Main body 22a Flange part 23 Lid member 23a Hanging part 23b Claw part 24 Input port 26 Output port 28 Air chamber 35 Valve body 38 Tube member 40 Annular groove 41 First communication passage 42 Second communication passage

Claims (4)

[Claims] 1. A main body having an input port and an output port and containing therein a valve device for controlling a flow of fluid between the input port and the output port, and covering an upper opening of the main body. A casing of a valve device, comprising: a lid member locked to the main body to form an air chamber in the main body; and a passage formed between the lid member and the main body and constantly communicating the air chamber with the atmosphere. The casing of the valve device, wherein the passage is formed to be bent, and an opening on the atmosphere side of the passage is formed below an upper end of the air chamber. 2. The passage has an annular groove formed between the main body and the lid member, a first communication passage communicating between the annular groove and the atmosphere, and a first communication passage. 2. The casing of the valve device according to claim 1, further comprising a second communication passage that communicates between the annular groove and the air chamber at a different circumferential position from the annular groove. 3. . 3. A cylindrical member sandwiched between the main body and the lid member, wherein the first and second communication passages and the annular groove are formed on an outer periphery of the cylindrical member. The casing of the valve device according to claim 2. 4. A lower end of the lid member overlapping an upper end of the main body includes a plurality of claws and a hanging portion, wherein the plurality of claws are formed on the main body. The casing of the valve device according to any one of claims 1 to 3, wherein the casing is engageable with the flange portion.