JPH0345265B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an air pressure source pressure regulating device that regulates the pressure in an air storage tank that stores compressed air discharged from an air compressor to a predetermined pressure.In particular, the piping structure is simplified and it is suitable for use in vehicles. related to equipment.

[Prior art and its problems]

Conventionally, in general, in this type of equipment, there is a main pipe having a check valve for preventing backflow between the air compressor and the storage tank, and the pressure in the storage tank is set to a predetermined value, for example, 9 kg/
^cm2 , the compressed air is sent to an unloader attached to the air compressor, and when the second predetermined pressure, for example 7Kg/ ^cm2 , is reached, the compressed air is sent from the unloader.A secondary pipe has a valve called a governor. is installed. However, when the piping is provided in duplicate in this way, there is a problem that the entire system becomes complicated and large. Particularly, in applications such as vehicles where mounting locations are limited and weight is an issue, various specific problems arise from these viewpoints. Therefore, Utility Model Application Publication No. 52-49923 or Japanese Patent Application Publication No.
Applying the idea of hydraulic unloader valves shown in the publications of No. 54-21568, the check valve and governor mechanisms described above are housed in one main body, and the secondary piping is omitted and the piping is integrated. It is conceivable that the This invention is based on the premise of unifying the piping, but goes one step further by providing the mechanism inside the main body with another function as a safety valve. The purpose of the present invention is to provide a highly safe technology that can ensure the minimum supply pressure level even in such cases.

[Disclosure of the invention]

Hereinafter, the content of the present invention will be made clear by describing embodiments shown in the drawings. In the drawings, the air pressure source pressure regulating device according to the present invention is designated as a whole by the reference numeral 1, and a main body 2 which also serves as a casing is located on the outside. The main body 2 consists of a body member 3 and a lid member 4. The copper member 3 has a hole running in the horizontal direction, and the opening side of the hole is airtightly closed by the lid member 4 with a seal ring 5 interposed. has been closed. Thereby, a laterally long chamber 6 is formed inside the main body 2. The upper part of the main body 2 is provided with an inlet 8 connected to the outlet side of the air compressor 7 on the right side, and an exhaust port 9 connected to the atmosphere on the left side. On the other hand, in the lower part of the main body 2, an outlet 11 connected to the inlet side of the compressed air storage tank 10 is provided on the left side near the lid member 4. Here, exhaust port 9
Although plug members or check valves may be placed in the area to prevent the ingress of dirt, etc., the air compressor 7 or the compressed air storage tank 1
There is no need for any piping between it and 0. Therefore, the piping for the air pressure source pressure regulating device 1 according to the present invention is only the piping 120 that connects the inlet 8 and the air compressor 7, and the piping 121 that connects the outlet 11 and the compressed air storage tank 10. The inlet 8, outlet 11, and exhaust port 9 provided in the main body 2 all communicate with the internal chamber 6,
Communication between them is determined by a movable body, a valve, etc. provided inside the chamber 6 or in the middle of a passage communicating with the chamber 6. First, between the inlet 8 and the outlet 11, they communicate with each other through a vertical passage 13 intersecting with the chamber 6 and a horizontal passage 14 following the passage 13, and both passages 13 and 14 A check valve 15 for preventing backflow is arranged at the intersection of the two. The check valve 15 consists of a valve seat 16 provided on the copper member 3 side and a valve member 18 to which a predetermined valve opening pressure is applied by a coil spring 17. It has the function of prohibiting movement and permitting the opposite. Although not shown, the valve member 18 is constructed by pasting rubber or the like on a metal substrate, and the coil spring 17 is supported between the lower surface of the valve member 18 on the metal substrate side and the plug 19. . The plug 19 is screwed to the body member 3 with a seal ring 20 interposed therebetween. Next, the chamber 6 itself inside the main body 2,
The chamber 6 has a structure in which a large diameter part 60 and a small diameter part 61 are continuous with each other, and a spring 21 for setting governor pressure is installed in the small diameter part 61, and a spring 21 is connected from the small diameter part 61 to the large diameter part 6.
Stepped pistons 22 are accommodated in the portions extending from 0 to 0, respectively. One end of the spring 21 enters the ring-shaped recessed part 23 inside the body member 3, and the spring 2
The other end of 1 is in contact with a spring receiver 25 which also serves as a support member for the rod 24. The rod 24 has the function of regulating the spring load of the spring 21. The rod 24 is threaded on the head side where the driver groove 26 is located, while a flange 27 is provided on the opposite side where the end has a small diameter. The rod 24 has a threaded portion 28 screwed to a nut 29 fixed to the body member 3, while a central portion passes inside the spring 21 and receives a spring receiver 25 at the flange 27.
Therefore, the length of the spring 21 can be changed by rotating the rod 24 from outside the main body 2 and moving the position of the flange 27.
The spring load of spring 21 is therefore determined by rod 24. Further, such a rod 24 also functions as a valve opening member that helps open another valve 30 housed inside the stepped piston 22. another valve 30
consists of a valve seat 31 provided on the stepped piston 22 side and a valve member 33 to which a predetermined valve opening pressure is applied by a spring 32 as a valve spring.
is arranged in a passage communicating with the exhaust port 9, and functions as a governor, so to speak. Because of that,
In order to communicate from the inlet 8 to the exhaust port 9 via the other valve 30, the spring receiver 25 is provided with through holes 34 at multiple locations in the circumferential direction, and the inside of the stepped piston 22 is hollow. and its hollow portion communicates with the exhaust port 9 through a communication passage 35. The valve member 33 has the same configuration as the valve member 18 of the check valve 15 described above, and has a relatively large seat area in order to reduce exhaust resistance during unloading. On the other hand, the stepped piston 22 consists of a large diameter part 220 and a small diameter part 221, and these large and small diameter parts 220,
221 are movably fitted into the large and small diameter portions 60 and 61 of the chamber 6, respectively. Furthermore, seal rings 36 and 37 are interposed in the fitting portions of the large and small diameter portions 220 and 221, respectively. Therefore, the stepped piston 22 has the large diameter portion 220 as the first pressure receiving surface of the effective pressure receiving area S ₁ determined by the seal ring 36 on the outer periphery, and the small diameter portion 221 as the first pressure receiving surface.
is the effective pressure receiving area determined by the seal ring 37.
S ₂ S ₂ <S ₁ ), each of which functions as a second pressure receiving surface. In order to house the valve 30 inside the stepped piston 22, the center of the large diameter portion 220 is formed into a plug, and the plug 38 is freely attached to other parts. In this case, since the plug 38 and other parts are screwed together, in order to form a seal between the exhaust port 9 side and the outlet 11 side and obtain the effective pressure receiving area _S1 , the screwed connection part is connected to the seal ring 39. Airtightness is ensured by
Note that the protrusion 380 provided on the head of the plug 38 is
This serves as a stopper for regulating the non-operating position of the stepped piston 22. Next, by explaining the operation of the air pressure source pressure regulating device 1 described above, various information such as the spring constant of each spring, each pressure during loading and unloading, effective pressure receiving areas S ₁ , S ₂ etc. Reveal the original relationship. [During load operation] When the air compressor 7 performs load operation, the compressed air obtained thereby reaches the inlet 8 from the pipe line 120, passes through the passage 13, and passes through the check valve 15, which is the first valve. The compressed air is then opened and stored in the compressed air storage tank 10 from the passage 14 through the outlet 11 and the conduit 121. For example, the opening pressure of the check valve 15 is
Since the upper limit pressure of the compressed air in the storage tank 10 is about 0.2 to 0.3 Kg/cm ² , which is lower than the upper limit pressure of, for example, 9 Kg/cm ² , during the load operation as above, the check valve 15
is mostly left open. During this time, the pressure Pin on the inlet 8 side is also applied to the second valve 30 inside the stepped piston 22, but the valve spring 32
Since the valve opening pressure at 0 is set sufficiently high, the second valve 30 remains closed. In addition, when driving on a road,
The pressure inside the compressed air storage tank 10 is the pressure on the outlet 11 side.
Pout is approximately equal to Pout, and the pressure Pout on the outlet side is approximately equal to the pressure pin on the inlet 8 side. Therefore,
Pin and Pout can be expressed as P. In this way, when the pressure in the compressed air storage tank 10 gradually increases, the differential area of the stepped piston 22 (S ₁ −
S ₂ ), P×(S ₁ − S ₂ ) is the force based on spring 2
1, the stepped piston 22 begins to move to the right in the figure. Then, the tip of the rod 24 hits the valve member 33 of the second valve 30, thereby causing the valve member 33 to separate from the valve seat 31, so that the inlet 8 side passes through the second valve 30 and is connected to the exhaust port 9.
side, that is, open to the atmosphere. This shifts to unloading operation. Here, since the specifications are set so that the pressure P at this transition point becomes the upper limit pressure, the pressure in the storage tank 10 will not rise above the upper limit pressure. Now, the valve opening pressure of the second valve 30 is higher than the upper limit pressure to be regulated by the valve spring 32, for example, 9.5
Kg/ ^cm2 . Moreover, this second valve 30
Regardless of the movement of the stepped piston 22, the valve can be opened in response to an abnormal increase in the pressure on the inlet 8 side.
Thereby, the second valve 30 has a function as a safety valve in addition to a function as a governor. Moreover, since there is such a second valve 30,
In the pressure regulator 1, a spring 2 for setting the governor pressure is used.
1 is broken, the pressure determined by the differential area between the first and second pressure receiving surfaces of the stepped piston 22, which is a movable body, and the biasing force of the valve spring 32 is reliably supplied to the circuit side. be able to. [During unload operation] When the second valve 30 is opened and the inlet 8 side and the exhaust port 9 side are in communication, the air compressor 7 performs the unload operation. Therefore, the pressure on the inlet 8 side
Since Pin is opened to atmospheric pressure, check valve 15 is closed. In such a state, when the compressed air in the storage tank 10 is consumed by an air brake device (not shown) or the like, the pressure in the storage tank 10 gradually decreases.
At a certain stage, the force acting on the stepped piston 22, that is, the force due to the spring 21, and
The balance with PoutXS ₂ (in this case, Pin is set to 0) is lost, and the stepped piston 22 is moved to the left in the figure by the force of the spring 21.
Here, at the time when the valve member 33 hits the valve seat 31 due to leftward movement, that is, at the time of transition from unloading operation to loading operation, the pressure Pout on the outlet 11 side is the lower limit pressure of the compressed air stored in the storage tank 10. For example, since the specifications are set to be 7 kg/cm ² , the pressure inside the storage tank 10 will not drop below the lower limit pressure. By repeating the above loading and unloading operations, compressed air maintained within a predetermined range is always stored in the storage tank 10. Note that a ball valve can also be used as the check valve (first valve) 15 and second valve 30.
In particular, since the second valve 30 has a higher opening pressure, a ball valve is more preferable. Furthermore, in the embodiment described above, the second valve 30 is housed inside the stepped piston 22, which is a movable body, thereby making the valve more compact.

【Effect of the invention】

As described above, according to the present invention, the piping is unified, and not only the governor is installed inside the main body.
This provides a highly safe air pressure source pressure regulating device that has the function of a safety valve and can also ensure the minimum supply pressure level even if the governor pressure setting spring breaks. By using it, you can take full advantage of its advantages.

[Brief explanation of drawings]

The drawing is a piping diagram including a sectional view of an air pressure source pressure regulating device that is an embodiment of the present invention. 1...Air pressure source pressure regulator, 2...Main body, 7...
...Air compressor, 8...Inlet, 9...Exhaust port, 10
... Compressed air storage tank, 11 ... Outlet, 120, 12
1... Piping, 15... Check valve (first valve) 22...
Stepped piston (movable body), 24... Rod, 3
0...Another valve (second valve).

Claims (1)

[Claims] 1. Inlet 8 connected to the outlet side of the air compressor 7
, an outlet 11 connected to the inlet side of the compressed air storage tank 10, and an exhaust port 9 communicating with the atmosphere are provided in the main body 2, and the following A is provided in the main body 2.
An air pressure source pressure regulating device having the features D and E, in which each component of ~C is housed. (A) A first valve 1 disposed in a passage connecting the inlet 8 and the outlet 11, which prohibits air movement from the outlet 11 side to the inlet 8 side, but allows the opposite.
5. (B) A movable body that receives the pressure on the outlet 11 side of the first valve 15 and, when a predetermined pressure is reached, overcomes the urging force of the governor pressure setting spring 21 and moves from the non-operating position to the operating position. 22. (C) The inlet 8 side of the first valve 15 is disposed in a passage communicating with the exhaust port 9, and the movable body 22
The second valve 30 closes when the valve is in the non-operating position and opens when the valve is in the operating position. (D) The second valve 30 has a valve member 33 that receives pressure on the inlet 8 side of the first valve 15 in the valve opening direction.
and a valve spring 32 that urges the valve member 33 toward the valve seat 31, the valve opening pressure of which is set higher than the upper limit pressure to be regulated, and a position opposite to the valve member 33. There is a rod 24 at the movable body 22, and when the movable body 22 moves to the operating position, the tip of the rod 24 abuts against the valve member 33 and is configured to overcome the biasing force of the valve spring 32. (E) The movable body 22 has a first pressure receiving surface that receives pressure on the outlet 11 side of the first valve 15, and a surface area smaller than the first pressure receiving surface that receives the pressure on the outlet 11 side of the first valve 15. and a second pressure-receiving surface that receives pressure from the side, and moves to the operating position in response to a force acting on the differential area between the first and second pressure-receiving surfaces. 2 The movable body 22 has the second valve 3 therein.
2. The air pressure source pressure regulating device according to claim 1, wherein the air pressure source pressure regulating device is a stepped piston that accommodates zero.