WO2016117166A1 - Safety valve, compressor, tank, brake control device, brake system and vehicle - Google Patents

Abstract

Provided is a safety valve (20) that comprises: a housing (21) that has a low-pressure chamber (31) that communicates with the outside and a high-pressure port (32) that opens into the low-pressure chamber; a valve body (22) that integrally forms a shaft part (41) which is inserted from the low-pressure-chamber side into the high-pressure port, and a large-diameter part (42) which is arranged in the low-pressure chamber, the valve body being movable in an axial direction of the shaft part with respect to the housing; an urging member (23) that urges the valve body toward a front side in the insertion direction of the shaft part; and an annular seal member (24) that is provided around an inner periphery of the high-pressure port and fills a space between an outer periphery of the shaft part and the inner periphery of the high-pressure port. In the shaft part, formed are valve body communication paths (43) that communicate with the high-pressure port by each having an opening which opens at a portion of the outer circumference of the shaft part in a circumferential direction, and by also being open at an end of the shaft part in the axial direction.

Description

Safety valve, compressor, tank, brake control device, brake system and vehicle

The present invention relates to a safety valve, and a compressor, a tank, a brake control device, a brake system, and a vehicle including the safety valve.
This application claims priority on January 19, 2015 based on Japanese Patent Application No. 2015-007643 for which it applied to Japan, and uses the content here.

Conventionally, a safety valve that discharges fluid (air, liquid, etc.) in an internal space to the outside when the pressure in the internal space such as various containers or piping becomes excessively high is known.
A conventional safety valve presses a valve body with a pressure regulating spring against a valve seat provided in an opening of a high pressure port communicating with a high pressure internal space such as a container or piping, so that the valve body can It has a structure that closes the opening. In this type of safety valve, when the pressure in the internal space acting on the surface of the valve body (pressure receiving surface) facing the high-pressure port side becomes larger than the pressing force of the valve body by the pressure regulating spring, the valve body The high-pressure fluid in the internal space is released to the outside (atmosphere). In many conventional safety valves, the valve seat and the valve body are joined together by sliding the metals together.

Further, Patent Document 1 discloses a safety valve that employs an elastic O-ring valve seat as a valve seat. In this configuration, the pressure receiving surface of the valve body is pressed against the elastic O-ring valve seat, and the elastic O-ring valve seat is elastically compressed, so that a gap between the valve body and the valve seat is filled.

Japanese Patent Laid-Open No. 7-4543

However, since the metal-to-metal friction requires a high level of operator skill, it is difficult to manufacture and maintain the safety valve.
On the other hand, when an elastic O-ring valve seat is employed as the valve seat, the safety valve can be easily manufactured and maintained. However, since the elastic O-ring valve seat is pressed against the pressure receiving surface of the valve body so as to be elastically compressed, the contact area of the elastic O-ring valve seat with the pressure receiving surface of the valve body according to the compression amount of the elastic O-ring valve seat Changes. That is, the area (pressure receiving area) of the pressure receiving surface of the valve body facing the high pressure port side changes. For this reason, the pressure value (pressure regulation value of the safety valve) in the high-pressure port tends to fluctuate when the fluid in the high-pressure port begins to blow out. For example, when the compression amount of the elastic O-ring valve seat increases, the contact area of the elastic O-ring valve seat with the pressure receiving surface of the valve body increases. For this reason, the pressure receiving area of the valve body that receives the pressure in the high pressure port is reduced, and accordingly, the pressure regulation value of the safety valve is increased.

The present invention provides a safety valve that is easy to manufacture and maintain and that can suppress fluctuations in the pressure regulation value, and a compressor, a tank, a brake control device, a brake system, and a vehicle including the safety valve.

According to the first aspect of the present invention, the safety valve includes a housing having a low pressure chamber communicating with the outside and a high pressure port opening to the low pressure chamber, and a shaft inserted into the high pressure port from the low pressure chamber side. And a large-diameter portion provided integrally with the shaft portion and having a larger diameter than the high-pressure port and disposed in the low-pressure chamber, and the axial direction of the shaft portion with respect to the housing Provided on the inner periphery of the high-pressure port facing the outer periphery of the shaft portion, and a biasing member that biases the valve body in the insertion direction of the shaft portion with respect to the high-pressure port. And an annular seal member that fills a gap between the outer periphery of the shaft portion and the inner periphery of the high-pressure port. A valve body communication passage is formed in the shaft portion. The valve body communication passage has an opening portion that opens at a part of a circumferential direction of the outer periphery of the shaft portion and also opens at an axial end portion of the shaft portion and communicates with the high-pressure port. ing.

In the safety valve configured as described above, in a state where the pressure in the high pressure port acting on the surface of the shaft portion facing the high pressure port side (for example, the axial end surface of the shaft portion) is smaller than the urging force of the urging member, the valve body communication passage The edge of the opening of the shaft portion in the insertion direction of the shaft portion with respect to the high-pressure port is positioned on the front side of the shaft portion in the insertion direction with respect to the seal member provided in the high-pressure port. In this state, the high pressure port and the valve body communication passage are partitioned from the low pressure chamber by the seal member, and the high pressure port does not communicate with the low pressure chamber. In this state, even if the pressure in the high pressure port is greater than the pressure on the low pressure chamber side, the fluid in the high pressure port does not blow out into the low pressure chamber.

On the other hand, when the pressure in the high pressure port acting on the surface of the shaft portion facing the high pressure port becomes larger than the biasing force of the biasing member, the valve body resists the biasing force of the biasing member. Move to the back of the insertion direction. When the end of the opening of the valve body communication passage moves to the rear side in the insertion direction of the shaft portion with respect to the movement of the valve body, the high pressure port passes through the opening of the valve body communication passage. Communicate with. The opening region of the opening that allows the valve body communication passage to communicate with the low-pressure chamber side is a region located on the rear side in the insertion direction of the shaft portion relative to the seal member in the opening. Thus, the high-pressure port communicates with the low-pressure chamber, so that the high-pressure fluid (high-pressure fluid) in the high-pressure port blows out toward the low-pressure chamber.

And according to the safety valve having the above-described configuration, the high-pressure port can be easily separated from the low-pressure chamber by the seal member provided on the inner periphery of the high-pressure port. That is, since the conventional metal rubbing is not necessary, the safety valve can be easily manufactured and maintained.

Further, according to the safety valve having the above configuration, the seal member that partitions the high pressure port and the low pressure chamber contacts the outer periphery of the shaft portion, and the surface of the shaft portion (pressure receiving surface) on which the pressure of the high pressure fluid in the high pressure port acts. Do not touch. For this reason, the area of the surface of the shaft portion on which the pressure of the high-pressure fluid acts is not affected by the seal member and does not change. Thereby, it can suppress that the pressure value in the high pressure port which the high pressure fluid in a high pressure port begins to blow out to the low pressure chamber side, ie, the pressure regulation value of a safety valve, fluctuates.

According to the second aspect of the present invention, in the plan view shape of the opening of the valve body communication passage viewed from the outer peripheral side of the shaft portion, the position is located on the rear side in the insertion direction of the shaft portion with respect to the high pressure port. The opening edge may be extended linearly along the circumferential direction of the seal member.

In the safety valve configured as described above, the edge of the opening of the valve body communication passage located on the rear side in the insertion direction of the shaft portion extends linearly along the circumferential direction of the seal member. For this reason, at the moment when the edge of the opening moves to the low-pressure chamber side relative to the seal member, it is possible to ensure a large opening area of the opening that opens to the low-pressure chamber side. Thereby, a large amount of high-pressure fluid in the high-pressure port can be quickly blown into the low-pressure chamber at the moment when the opening of the valve body communication passage opens to the low-pressure chamber side.

In addition, since the pressure received by the large-diameter portion of the valve element arranged in the low-pressure chamber increases rapidly due to the rapid discharge of the high-pressure fluid to the low-pressure chamber side, the valve element is rapidly moved to the rear side in the insertion direction of the shaft part. Can be moved. That is, a quick pop-up operation of the valve body can be realized.
Thereby, the opening area of the opening part of the valve body communication path opened to the low-pressure chamber side is further expanded, and a larger amount of high-pressure fluid can be quickly blown out to the low-pressure chamber side. That is, it becomes possible to quickly reduce the pressure of the fluid in the container or pipe connected to the high pressure port.

According to the third aspect of the present invention, the valve body communication passage is formed in a groove shape extending in the axial direction of the shaft portion on the outer periphery of the shaft portion, and the valve body communication passage formed in the groove shape is provided. One end portion in the extending direction may open to an end surface in the axial direction of the shaft portion located on the high-pressure port side.

According to the fourth aspect of the present invention, the shape of the opening of the valve body communication passage viewed from the outer peripheral side of the shaft portion may be a rectangular shape.

According to the safety valve having the above configuration, the valve body communication passage can be easily formed in the shaft portion.

According to the fifth aspect of the present invention, the safety valve includes a housing having a low pressure chamber communicating with the outside and a high pressure port opening in the low pressure chamber, and a shaft inserted into the high pressure port from the low pressure chamber side. And a large-diameter portion provided integrally with the shaft portion and having a larger diameter than the high-pressure port and disposed in the low-pressure chamber, and the axial direction of the shaft portion with respect to the housing Provided on the outer periphery of the shaft portion opposed to the inner periphery of the high-pressure port, and a urging member that urges the valve body in the insertion direction of the shaft portion with respect to the high-pressure port. And an annular seal member that fills a gap between the outer periphery of the shaft portion and the inner periphery of the high-pressure port. A housing communication passage is formed which has an opening opening in a part of the inner circumferential direction of the high-pressure port and also opens in the low-pressure chamber and communicates with the low-pressure chamber.

In the safety valve configured as described above, in a state where the pressure in the high pressure port acting on the surface of the shaft portion facing the high pressure port side (for example, the end surface in the axial direction of the shaft portion) is smaller than the urging force of the urging member, The seal member provided in the portion is positioned on the front side in the insertion direction with respect to the edge in the insertion direction front side of the shaft portion with respect to the high pressure port in the opening portion of the housing communication path. In this state, the low pressure chamber and the housing communication path and the high pressure port are partitioned by the seal member, and the high pressure port does not communicate with the low pressure chamber. In this state, even if the pressure in the high pressure port is greater than the pressure on the low pressure chamber side, the fluid in the high pressure port does not blow out into the low pressure chamber.

On the other hand, when the pressure in the high pressure port acting on the surface of the shaft portion facing the high pressure port becomes larger than the biasing force of the biasing member, the valve body resists the biasing force of the biasing member. Move to the back of the insertion direction. As the valve body moves, the high pressure port communicates with the low pressure chamber through the opening of the housing communication passage when the seal member moves to the rear side in the insertion direction of the shaft portion from the edge of the opening of the housing communication passage. To do. The opening region of the opening that allows the housing communication path to communicate with the high-pressure port side is a region located on the front side in the insertion direction of the shaft portion with respect to the seal member. Thus, the low-pressure chamber communicates with the high-pressure port, so that the high-pressure fluid (high-pressure fluid) in the high-pressure port blows out toward the low-pressure chamber.

And according to the safety valve having the above configuration, the high pressure port can be easily partitioned from the low pressure chamber by the seal member provided on the outer periphery of the shaft portion of the valve body. That is, since the conventional metal rubbing is not necessary, the safety valve can be easily manufactured and maintained.

Further, according to the safety valve having the above-described configuration, the seal member that partitions the high pressure port and the low pressure chamber contacts the inner periphery of the high pressure port, and the surface of the shaft portion (pressure receiving surface) on which the pressure of the high pressure fluid in the high pressure port acts. ) Do not touch. For this reason, the area of the surface of the shaft portion on which the pressure of the high-pressure fluid acts is not affected by the seal member and does not change. Thereby, it can suppress that the pressure value in the high pressure port which the high pressure fluid in a high pressure port begins to blow out to the low pressure chamber side, ie, the pressure regulation value of a safety valve, fluctuates.

According to the sixth aspect of the present invention, in the plan view shape of the opening portion of the housing communication passage viewed from the inner peripheral side of the high-pressure port, it is located on the front side in the insertion direction of the shaft portion with respect to the high-pressure port. The edge of the opening may extend linearly along the circumferential direction of the seal member.

In the safety valve configured as described above, the edge of the opening of the housing communication passage located on the front side in the insertion direction of the shaft portion extends linearly along the circumferential direction of the seal member. For this reason, a large opening area of the opening that opens to the high-pressure port side can be secured at the moment when the seal member moves to the low-pressure chamber side from the edge of the opening. Thereby, at the moment when the opening of the housing communication passage opens to the high pressure port side, a large amount of high pressure fluid in the high pressure port can be quickly blown to the low pressure chamber side.

In addition, the pressure of the high-pressure fluid received by the large-diameter portion of the valve body arranged in the low-pressure chamber is rapidly increased by the rapid discharge of the high-pressure fluid to the low-pressure chamber side. It can be moved to the rear side. That is, a quick pop-up operation of the valve body can be realized.
Thereby, the opening area of the opening part opened to the high-pressure port side is further expanded, and a larger amount of high-pressure fluid can be quickly blown out to the low-pressure chamber side. That is, it becomes possible to quickly reduce the pressure of the fluid in the container or pipe connected to the high pressure port.

According to the seventh aspect of the present invention, the seal member may be elastically deformable.
In this case, the gap between the outer periphery of the shaft portion and the inner periphery of the high-pressure port can be suitably filled by elastically deforming the seal member.

According to the eighth aspect of the present invention, the compressor is a compressor that compresses a fluid from the outside to generate a high-pressure fluid, and incorporates the safety valve.

According to the ninth aspect of the present invention, the tank is a tank for storing high-pressure fluid supplied from the outside, and incorporates the safety valve.

According to the tenth aspect of the present invention, the brake control device adjusts the pressure of the high-pressure fluid supplied from the outside, and then supplies the high-pressure fluid to the brake device that brakes the vehicle body with the high-pressure fluid. A brake control device incorporating the safety valve.

According to the eleventh aspect of the present invention, the brake system includes a compressor that compresses a fluid supplied from the outside to generate a high-pressure fluid, and a tank that stores the high-pressure fluid supplied from the compressor. A brake device that brakes the vehicle body with the high-pressure fluid; a brake control device that supplies the high-pressure fluid to the brake device after adjusting the pressure of the high-pressure fluid supplied from the tank; and the safety valve; Is provided. The safety valve is incorporated in at least one of the compressor, the tank, and the brake control device.

According to a twelfth aspect of the present invention, a vehicle includes a vehicle main body having a vehicle body and a traveling carriage capable of traveling on a track or a traveling road, and the brake system that brakes the traveling carriage.

According to the above-described aspect of the present invention, it is possible to easily manufacture and maintain the safety valve. It is also possible to suppress fluctuations in the pressure regulation value of the safety valve.

1 is a schematic view showing a vehicle according to a first embodiment of the present invention. 1 is a block diagram showing a brake system provided in a vehicle according to a first embodiment of the present invention. It is a schematic sectional drawing which shows the safety valve which concerns on 1st embodiment of this invention. It is sectional drawing which shows the principal part of the safety valve shown in FIG. It is the bottom view which looked at the valve body shown in FIG. 4 from the a direction of FIG. It is sectional drawing which shows operation | movement of the valve body of the safety valve shown in FIG. It is sectional drawing which shows the modification of the valve body of the safety valve shown in FIG. It is a bottom view which shows the modification of the valve body of the safety valve shown in FIG. It is a bottom view which shows the modification of the valve body of the safety valve shown in FIG. It is a bottom view which shows the modification of the valve body of the safety valve shown in FIG. It is sectional drawing which shows the principal part of the safety valve which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the principal part of the safety valve which concerns on 3rd embodiment of this invention. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10. It is sectional drawing which shows operation | movement of the valve body of the safety valve shown in FIG.

Hereinafter, a safety valve, a compressor, a tank, a brake control device, a brake system, and a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited only to these embodiments.

[First embodiment]
First, a safety valve, a compressor, a tank, a brake control device, a brake system, and a vehicle according to a first embodiment will be described with reference to FIGS.
As shown in FIG. 1, the vehicle 1 of this embodiment is a rail vehicle etc., for example.
The vehicle 1 includes a vehicle main body 2 capable of traveling on a track, and a brake system 3 provided on the vehicle main body 2.

In the present embodiment, a plurality of vehicle main bodies 2 are connected to each other. In the following description, the vehicle body 2 indicates the vehicle body 2 for one vehicle.
The vehicle body 2 includes a traveling carriage 11 having wheels 11 a that roll on rails (not shown) provided on the track, and a vehicle body 12 supported by the traveling carriage 11.

As shown in FIG. 2, the brake system 3 includes a compressor 13, a tank 14, a brake device 15, and a brake control device 16.
The compressor 13 compresses air (fluid) from the outside to generate high-pressure air (high-pressure fluid).
The tank 14 stores high-pressure air supplied from the compressor 13 (external).
The brake device 15 applies a braking force to the traveling carriage 11 using the high-pressure air described above.
The brake device 15 is, for example, a disc brake having a pressure-increasing cylinder, a road surface brake, or the like, and is provided for each traveling carriage 11 shown in FIG. 1, each vehicle body 2, or each wheel 11a.

The brake control device 16 adjusts the pressure of the high-pressure air supplied from the tank 14 (external), and then supplies the high-pressure air to the brake device 15 that brakes the vehicle body 2.
The brake control device 16 of this embodiment includes a command generation unit 161, a pressure generation unit 162, a variable load valve 163, a switching valve 164, and a relay valve 165.
The command generator 161 generates a brake command (electric signal).
The pressure generator 162 outputs the pressure corresponding to the brake command from the command generator 161 using the high-pressure air from the tank 14.
The variable load valve 163 outputs a pressure corresponding to the weight of the vehicle 1 using the high-pressure air from the tank 14.
The switching valve 164 selects and outputs one of the pressures output from the pressure generator 162 or the variable load valve 163.
The relay valve 165 amplifies the air capacity of the pressure output from the switching valve 164 using the high-pressure air from the tank 14 and introduces it to the brake device 15.

A safety valve 20 is incorporated in the brake system 3 described above. The safety valve 20 may be incorporated into at least one of the compressor 13, the tank 14, and the brake control device 16. In FIG. 2, the safety valve 20 is incorporated in all of the compressor 13, the tank 14 and the brake control device 16. However, in the following description, the safety valve 20 is incorporated in all of the compressor 13, the tank 14 and the brake control device 16. Not limited.
Hereinafter, the safety valve 20 of the present embodiment will be described in detail.

As shown in FIG. 3, the safety valve 20 includes a housing 21, a valve body 22, an urging member 23, and a seal member 24.
The housing 21 includes a low pressure chamber 31 communicating with the outside, and a high pressure port 32 (primary side port) that opens to the low pressure chamber 31. In the low-pressure chamber 31 of the present embodiment, a housing space 33 that communicates with the high-pressure port 32 and arranges a part of a valve body 22 and an urging member 23 described later, and the housing space 33 outside the housing 21 (atmosphere). And a low-pressure port 34 (secondary port) for communication. Further, the low pressure chamber 31 of the present embodiment also includes a back pressure port 35 that allows the accommodation space 33 to communicate with the outside (atmosphere) of the housing 21. The low pressure port 34 and the back pressure port 35 are located away from the high pressure port 32.

The housing 21 of the present embodiment is formed in a cylindrical shape whose first end in the axial direction is open and whose second end is closed. The high-pressure port 32 and the accommodation space 33 are arranged side by side in the axial direction of the housing 21. The high pressure port 32 constitutes the first end of the housing 21. The accommodation space 33 and the high-pressure port 32 of the present embodiment are formed in a circular shape centered on the axis C <b> 1 of the housing 21 when viewed from the axial direction of the housing 21. The inner diameter dimension of the accommodation space 33 is larger than the inner diameter dimension of the high-pressure port 32.

The low pressure port 34 and the back pressure port 35 are formed so as to extend in the radial direction of the housing 21 from the inner periphery of the accommodation space 33 to the outer periphery of the housing 21. A plurality of low pressure ports 34 and back pressure ports 35 are arranged at intervals in the circumferential direction of the housing 21.
The low pressure port 34 is formed at a position away from the high pressure port 32 in the axial direction of the housing 21 (second end side of the housing 21). Further, the back pressure port 35 is formed at a position further away from the low pressure port 34 in the axial direction of the housing 21.
Although not shown, the housing 21 may be provided with an opening adjusting portion that adjusts the area of the opening to the outside of the back pressure port 35 described above, for example.

Furthermore, in the housing 21 of the present embodiment, the accommodation space 33 described above includes a first space region 331, a second space region 332, a third space region 333, and the like, which are sequentially arranged in the axial direction of the housing 21 from the high-pressure port 32 side. A fourth space region 334 is included. These first to fourth space regions 331 to 334 are each formed in a circular shape centered on the axis C 1 of the housing 21 when viewed from the axial direction of the housing 21.

The first space region 331 is a region where the high-pressure port 32 opens. The inner diameter dimension of the first space region 331 is larger than that of the high pressure port 32.
The inner diameter dimension of the second space region 332 is larger than that of the first space region 331. The low-pressure port 34 described above is opened on the inner periphery of the second space region 332.
The inner diameter dimension of the third space region 333 is larger than that of the second space region 332.
The inner diameter dimension of the fourth space area 334 may be set to be larger than the inner diameter dimension of the third space area 333, for example, but is set smaller than the third space area 333 in the present embodiment. Further, the inner diameter dimension of the fourth space region 334 may be equal to or different from that of the second space region 332. In the inner periphery of the fourth space region 334, the back pressure port 35 described above is opened.

As shown in FIGS. 3 and 4, the valve body 22 is provided so as to be movable in the axial direction with respect to the housing 21. The valve body 22 includes a shaft portion 41 that is inserted into the high pressure port 32 from the low pressure chamber 31 side, and a large diameter portion 42 that is provided integrally with the shaft portion 41 and has a larger diameter than the high pressure port 32.
The shaft portion 41 of the present embodiment is formed in a circular shape when viewed from the axial direction. The outer diameter dimension of the shaft portion 41 is set slightly smaller than the inner diameter dimension of the high-pressure port 32. In a state where the shaft portion 41 is inserted into the high pressure port 32, the axis C2 of the shaft portion 41 coincides with the axis C1 of the high pressure port 32 (housing 21). In this state, the shaft portion 41 can move in the axial direction of the high-pressure port 32.

As shown in FIGS. 4 and 5, the shaft portion 41 is formed with a valve body communication passage 43 for communicating the high pressure port 32 with the low pressure chamber 31. The valve body communication passage 43 has an opening 431 that opens at a part of the outer periphery of the shaft portion 41 in the circumferential direction. Further, the valve body communication passage 43 opens to the axial end portion of the shaft portion 41 and communicates with the high pressure port 32.
In the plan view shape of the opening 431 of the valve body communication passage 43 as viewed from the outer peripheral side of the shaft portion 41, the edge 432 of the opening 431 located on the rear side in the insertion direction of the shaft portion 41 with respect to the high pressure port 32 is The shaft portion 41 extends linearly in the circumferential direction so as to be orthogonal to the axis C <b> 2 of the portion 41. An end edge 432 of the opening 431 of the valve body communication passage 43 is located away from a later-described large diameter portion 42 in the axial direction of the shaft portion 41 (front side in the insertion direction of the shaft portion 41 with respect to the high pressure port 32).

The valve body communication passage 43 of the present embodiment is formed in a groove shape extending in the axial direction of the shaft portion 41 on the outer periphery of the shaft portion 41. One end portion in the extending direction of the valve body communication passage 43 formed in a groove shape opens to an end surface 41a in the axial direction of the shaft portion 41 located on the high pressure port 32 side. That is, the opening 431 of the valve body communication passage 43 that opens to the outer periphery of the shaft portion 41 is formed to extend to the axial end of the shaft portion 41 that is located on the high-pressure port 32 side.

Moreover, in this embodiment, as shown in FIG. 4, the planar view shape of the opening part 431 of the groove-shaped valve body communication path 43 seen from the outer peripheral side of the axial part 41 is a rectangular shape.
Furthermore, in this embodiment, as shown in FIGS. 4 and 5, a groove-like valve body communication passage 43 is formed to be recessed from the outer periphery of the shaft portion 41. The shape of the bottom of the groove-like valve body communication passage 43 as viewed from the axial end surface 41a side of the shaft portion 41 may be formed in an arbitrary shape (for example, a polygonal shape such as a rectangular shape). It is formed in an arc shape.

Further, the shaft portion 41 of the present embodiment is formed with a plurality of the groove-shaped valve body communication passages 43 described above. The plurality of valve body communication passages 43 are arranged at intervals in the circumferential direction of the shaft portion 41.
More specifically, the plurality of valve body communication passages 43 are arranged at equal intervals in the circumferential direction of the shaft portion 41. That is, a plurality of openings 431 of the valve body communication passage 43 are arranged at equal intervals in the circumferential direction of the shaft portion 41 on the outer periphery of the shaft portion 41. 4 and 5, four valve body communication passages 43 are formed, but the present invention is not limited to this.
Further, the end edges 432 of the plurality of openings 431 located on the rear side in the insertion direction of the shaft portion 41 coincide with each other with respect to the position of the shaft portion 41 in the axial direction.

As shown in FIGS. 3 and 4, the large diameter portion 42 is disposed in the accommodation space 33 of the low pressure chamber 31. The large diameter portion 42 of the present embodiment is configured by sequentially arranging a first large diameter portion 421, a second large diameter portion 422, and a third large diameter portion 423 in the axial direction of the shaft portion 41 from the shaft portion 41 side. Yes.
The outer diameter dimension of the first large diameter portion 421 is slightly smaller than the inner diameter dimension of the first space region 331 of the accommodation space 33. For this reason, the first large diameter portion 421 can be inserted into the first space region 331 from the second space region 332 side.

The outer diameter of the second large diameter portion 422 is larger than the outer diameter of the first large diameter portion 421 and the inner diameter of the first space region 331. Further, the outer diameter of the second large diameter portion 422 is slightly smaller than the inner diameter of the second space region 332. For this reason, the second large diameter portion 422 can be inserted into the second space region 332 from the third space region 333 side, but cannot be inserted into the first space region 331.
The outer diameter of the third large diameter portion 423 is larger than the outer diameter of the second large diameter portion 422 and the inner diameter of the second space region 332. Further, the outer diameter of the third large diameter portion 423 is smaller than the inner diameter of the third space region 333. For this reason, the third large-diameter portion 423 can be inserted into the third space region 333 but cannot be inserted into the second space region 332.

When the valve body 22 configured as described above is inserted into the second space region 332, the first space region 331, and the high pressure port 32 from the third space region 333 side of the accommodation space 33, the third large diameter portion 423 becomes the third large diameter portion 423. It contacts the end surface of the space area 333 on the second space area 332 side.
In this state, the shaft portion 41 is inserted into the high-pressure port 32 and the first large diameter portion 421 is inserted into the first space region 331. Further, the second large diameter portion 422 is inserted into the second space region 332. However, in the present embodiment, the first large-diameter portion 421 is positioned at an interval in the axial direction of the housing 21 with respect to the end surface on the high-pressure port 32 side in the first space region 331. The second large-diameter portion 422 is positioned at an interval in the axial direction of the housing 21 with respect to the end surface of the second space region 332 on the first space region 331 side.

In this state, the opening of the low pressure port 34 is covered with the outer periphery of the second large diameter portion 422.
Further, in this state, the second large-diameter portion 422 and the third large-diameter portion 423 of the valve body 22 cause the first and second space regions 331 and 332 and the third and fourth space regions 333 and 333 of the accommodation space 33 to be formed. 334. In the following description, the first and second space regions 331 and 332 defined by the valve body 22 may be referred to as a pop-up chamber 335. In addition, the third and fourth space regions 333 and 334 defined by the valve body 22 may be referred to as a back pressure chamber 336.

And the valve body 22 of this embodiment is formed penetrating through the inside, and the direction in which the valve body 22 extracts the shaft portion 41 from the high-pressure port 32 from the position shown in FIGS. 3 and 4 (insertion direction of the shaft portion 41). When moved to the rear side, there is a back pressure chamber communication passage 44 for communicating the first and second space regions 331 and 332 with the third and fourth space regions 333 and 334 (back pressure chamber 336).
The first end in the longitudinal direction of the back pressure chamber communication path 44 is the opening position of the low pressure port 34 with respect to the inner periphery of the second space region 332 in a state where the valve element 22 is disposed at the position shown in FIGS. Rather than the first space region 331, the first and second space regions 331 and 332 (pop-up chamber 335) are opened. Further, the second end of the back pressure chamber communication passage 44 in the longitudinal direction is located at the opening position of the second end of the back pressure chamber communication passage 44 from the opening position of the low pressure port 34 with respect to the inner periphery of the second space region 332. Is also opened at a position shifted to the third space region 333 side.
3 and 4, each back pressure chamber communication passage 44 is formed to be inclined with respect to the axis C <b> 2 of the valve body 22 so that a plurality of back pressure chamber communication passages 44 intersect each other. However, it is not limited to this.

As shown in FIG. 3, the biasing member 23 biases the valve body 22 in the insertion direction of the shaft portion 41 with respect to the high-pressure port 32 (front side in the insertion direction).
The biasing member 23 is, for example, a coil spring. The urging member 23 is mainly disposed in the back pressure chamber 336 of the housing 21. The urging member 23 is sandwiched between the valve body 22 arranged as described above and the adjusting screw 25 screwed to the second end side of the housing 21 with respect to the valve body 22, and is elastically compressed. ing. This generates a biasing force (spring force) that biases the valve body 22 toward the front side of the shaft portion 41 in the insertion direction. The magnitude of the urging force can be adjusted by rotating the adjusting screw 25 with respect to the housing 21 and moving the adjusting screw 25 in the axial direction of the housing 21.

As shown in FIGS. 3 and 4, the seal member 24 is formed in an annular shape, and fills a gap between the inner periphery of the high-pressure port 32 and the outer periphery of the shaft portion 41 inserted into the high-pressure port 32. The seal member 24 is provided on the inner periphery of the high-pressure port 32 that faces the outer periphery of the shaft portion 41. The seal member 24 is held on the inner periphery of the high-pressure port 32 by being inserted into a groove formed at a position away from the opening end of the high-pressure port 32 that opens into the accommodation space 33. Further, the seal member 24 is provided such that the axis thereof coincides with the axis lines C1 and C2 of the high-pressure port 32 and the shaft portion 41. For this reason, the edge 432 located on the rear side in the insertion direction of the shaft portion 41 in the opening portion 431 of the valve body communication passage 43 described above extends linearly along the circumferential direction of the seal member 24.
The seal member 24 may be, for example, a metal gasket, but the seal member 24 of the present embodiment is formed of rubber that can be elastically deformed. This type of seal member 24 includes, for example, Y packing, but the seal member 24 of this embodiment is an O-ring.

The seal member 24 described above is more axial than the edge 432 of the opening 431 of the valve body communication passage 43 in a state where the valve body 22 is arranged at the position shown in FIGS. 3 and 4 by the urging force of the urging member 23. It is located on the rear side in the insertion direction of the portion 41. In this state, since the seal member 24 is in close contact with the entire circumferential direction of the outer periphery of the shaft portion 41, the high pressure port 32 and the valve body communication passage 43 are partitioned from the low pressure chamber 31, and the high pressure port 32 communicates with the low pressure chamber 31. do not do.
On the other hand, as shown in FIG. 6, the valve body 22 moves to the rear side in the insertion direction of the shaft portion 41, and the edge 432 of the opening 431 of the valve body communication passage 43 is closer to the low pressure chamber 31 than the seal member 24. In the moved state, the high pressure port 32 communicates with the low pressure chamber 31 through the opening 431 of the valve body communication passage 43. The opening area 431 of the valve body communication path 43 that allows the valve body communication path 43 to communicate with the low pressure chamber 31 side is an area that is located on the rear side in the insertion direction of the shaft portion 41 with respect to the seal member 24 in the opening 431. is there.

When the safety valve 20 of the present embodiment configured as described above is incorporated in the compressor 13 (see FIG. 2) of the brake system 3 described above, the high-pressure port 32 is present in, for example, the high-pressure air generated in the compressor 13. What is necessary is just to make it communicate with the area | region to do.
Further, when the safety valve 20 is incorporated in the tank 14 (see FIG. 2) of the brake system 3, the high pressure port 32 may be communicated with the tank 14.
When the safety valve 20 is incorporated in the brake control device 16 (see FIG. 2), the high pressure port 32 is connected to the pressure generator 162, the variable load valve 163, the switching valve 164, and the relay valve 165 of the brake control device 16. It is sufficient to communicate with the inside of the pipe to be connected and the pipe of the brake control device 16 connected to the tank 14 and the brake device 15.

Next, operation | movement of the safety valve 20 of this embodiment mentioned above is demonstrated.
In a state where the pressure in the high pressure port 32 acting on the end surface 41a of the shaft portion 41 facing the high pressure port 32 is smaller than the urging force of the urging member 23, the valve body 22 is arranged at the position shown in FIGS. The
In this state, since the seal member 24 is in close contact with the entire circumferential direction of the outer periphery of the shaft portion 41, the high pressure port 32 and the valve body communication passage 43 are partitioned from the low pressure chamber 31, and the high pressure port 32 communicates with the low pressure chamber 31. do not do. Therefore, even if the pressure in the high pressure port 32 is higher than the pressure on the low pressure chamber 31 side, the air (fluid) in the high pressure port 32 does not blow out into the low pressure chamber 31.

On the other hand, when the pressure in the high pressure port 32 acting on the surface of the shaft portion 41 such as the end surface 41a facing the high pressure port 32 becomes larger than the urging force of the urging member 23, as shown in FIG. The valve body 22 moves to the rear side in the insertion direction of the shaft portion 41 against the urging force of the urging member 23. When the end 432 of the opening 431 of the valve body communication passage 43 moves to the rear side in the insertion direction of the shaft portion 41 with respect to the movement of the valve body 22, the high pressure port 32 is moved to the valve body communication passage 43. The first and second space regions 331 and 332 (pop-up chamber 335) of the low pressure chamber 31 communicate with each other through the opening 431. An opening region of the opening 431 that allows the valve body communication passage 43 to communicate with the first and second space regions 331 and 332 is a region located on the rear side in the insertion direction of the shaft portion 41 with respect to the seal member 24 in the opening 431. is there. Thus, the high-pressure port 32 communicates with the low-pressure chamber 31, whereby high-pressure air (high-pressure air) in the high-pressure port 32 blows out to the low-pressure chamber 31.

Further, when the high pressure air blows out to the first and second space regions 331 and 332 of the low pressure chamber 31, the pressure of the first and second space regions 331 and 332 increases. It acts not only on the surface of the shaft portion 41 such as the end surface 41a facing the surface but also on the surfaces of the first large diameter portion 421 and the second large diameter portion 422 of the large diameter portion 42 facing the shaft portion 41 side. That is, the pressure receiving area of the valve body 22 on which the pressure of the high pressure air acts increases, and the valve body 22 further moves to the rear side in the insertion direction of the shaft portion 41 against the urging force of the urging member 23. Thereby, the opening area of the opening part 431 of the valve body communication path 43 opened to the low-pressure chamber 31 side is expanded, and a large amount of high-pressure air is transferred from the high-pressure port 32 to the first and second space regions 331 and 332 of the low-pressure chamber 31. Can be blown out.
The high-pressure air blown out to the first and second space regions 331 and 332 is discharged to the outside (atmosphere) through the low-pressure port 34. Further, the high-pressure air is discharged to the outside from the first and second space regions 331 and 332 through the back pressure chamber communication passage 44 of the valve body 22, the third and fourth space regions 333 and 334, and the back pressure port 35. Is done.

As described above, according to the safety valve 20 of the present embodiment, the high pressure port 32 can be partitioned from the low pressure chamber 31 by the seal member 24 provided on the inner periphery of the high pressure port 32. That is, since the conventional metal rubbing is not required, the safety valve 20 can be easily manufactured and maintained. Further, the compressor 13 including the safety valve 20, the tank 14, the brake control device 16, the brake system 3, and the vehicle 1 can be easily manufactured and maintained.

Further, according to the safety valve 20 of the present embodiment, the seal member 24 that partitions the high pressure port 32 and the low pressure chamber 31 contacts the outer periphery of the shaft portion 41, and the shaft on which the pressure of the high pressure air in the high pressure port 32 acts. It does not contact the surface of the portion 41 (for example, the end surface 41a of the shaft portion 41). For this reason, the area of the surface of the shaft portion 41 on which the pressure of the high pressure air acts is not affected by the seal member 24 and does not change. Thereby, it can suppress that the pressure value in the high pressure port 32 which the high pressure air in the high pressure port 32 begins to blow out to the low pressure chamber 31 side, ie, the pressure regulation value of the safety valve 20, is fluctuated.

Furthermore, according to the safety valve 20 of the present embodiment, the end edge 432 of the opening 431 located on the rear side in the insertion direction of the shaft portion 41 extends linearly along the circumferential direction of the seal member 24. For this reason, at the moment when the edge 432 of the opening 431 moves to the low pressure chamber 31 side relative to the seal member 24, a large opening area of the opening 431 opening to the low pressure chamber 31 side can be secured. As a result, at the moment when the opening 431 of the valve body communication passage 43 is opened to the low pressure chamber 31 side, a large amount of high pressure air in the high pressure port 32 is quickly supplied to the first and second space regions 331 and 332 of the low pressure chamber 31. Can be blown out.

Further, since the pressure received by the large-diameter portion 42 is rapidly increased by the rapid blow-out of the high-pressure air to the low-pressure chamber 31 side, the valve body 22 can be rapidly moved to the rear side in the insertion direction of the shaft portion 41. . That is, the quick pop-up operation of the valve body 22 can be realized.
Thereby, the opening area of the opening part 431 of the valve body communication path 43 opened to the low-pressure chamber 31 side is further expanded, and a larger amount of high-pressure air can be quickly blown out to the low-pressure chamber 31 side. That is, it is possible to quickly reduce the air pressure in a container or a pipe connected to the high-pressure port 32 (in this embodiment, in the compressor 13, the tank 14, the pipe of the brake control device 16, etc.). Become.

Further, in the safety valve 20 of the present embodiment, the valve body communication passage 43 is formed in a groove shape extending in the axial direction of the shaft portion 41 on the outer periphery of the shaft portion 41, and one end portion in the extending direction of the valve body communication passage 43 is a shaft. Opened to the end face 41 a of the portion 41. The valve body communication passage 43 having such a shape can be easily formed. That is, the valve body 22 can be easily manufactured.

Further, since the valve body communication passage 43 is formed in a groove shape on the outer periphery of the shaft portion 41, the seal member 24 and the outer periphery of the shaft portion 41 are in a state where the valve body 22 has moved to the position shown in FIG. 6. The contact area is reduced. That is, the sliding resistance between the seal member 24 and the shaft portion 41 is reduced. Thereby, the pop-up operation of the valve body 22 can be performed more quickly.

Further, according to the safety valve 20 of the present embodiment, the opening 431 of the valve body communication passage 43 is formed in a part of the outer periphery of the shaft portion 41 in the circumferential direction. Therefore, even when the high pressure port 32 is in communication with the low pressure chamber 31 as shown in FIG. 6, the seal member 24 is connected to the remaining portion in the circumferential direction of the outer periphery of the shaft portion 41 of the valve body 22 and the inner periphery of the high pressure port 32. And can be held between.
Furthermore, according to the safety valve 20 of the present embodiment, the openings 431 of the plurality of valve body communication passages 43 are arranged at equal intervals in the circumferential direction of the shaft portion 41. For this reason, even when the high-pressure port 32 is in communication with the low-pressure chamber 31, the seal member 24 can be stably held between the outer periphery of the shaft portion 41 and the inner periphery of the high-pressure port 32.

Further, according to the safety valve 20 of the present embodiment, the seal member 24 can be elastically deformed. For this reason, the gap between the inner periphery of the high-pressure port 32 and the outer periphery of the shaft portion 41 inserted into the high-pressure port 32 can be suitably filled with the seal member 24.

In the safety valve 20 of the first embodiment described above, the shape of the opening 431 of the groove-shaped valve body communication passage 43 as viewed from the outer peripheral side of the shaft portion 41 is not limited to a rectangular shape, but at least the valve body communication passage 43. As long as the edge 432 of the opening 431 is formed in a straight line, it may be formed in an arbitrary shape.
That is, the plan view shape of the opening 431 of the groove-like valve body communication passage 43 viewed from the outer peripheral side of the shaft portion 41 is, for example, as shown in FIG. 7, a base having an end edge 432 of the opening 431 as a short side. It may be formed into a shape. Moreover, both sides of the edge 432 of the valve body communication path 43 formed in a straight line may be rounded, for example. Further, the “linear shape” indicating the shape of the edge 432 of the valve body communication passage 43 is not only strictly a linear shape extending in the circumferential direction of the seal member 24 but also slightly inclined with respect to the circumferential direction of the seal member 24. And curved line shapes are also included.

The groove-shaped valve body communication passage 43 is not limited to be formed to be recessed from the outer periphery of the shaft portion 41. For example, as shown in FIGS. 8A to 8C, a part of the outer periphery of the shaft portion 41 in the circumferential direction is flat. It may be formed by scraping off the outer peripheral portion of the shaft portion 41 so that In this case, in order to sufficiently secure the volume of each valve body communication passage 43, and in order to increase the contact portion between the outer periphery of the shaft portion 41 and the seal member 24, they are arranged at intervals in the circumferential direction. It is preferable to set the number of groove-shaped valve body communication passages 43 as small as shown in FIGS. 8B and 8C rather than as many as shown in FIG. 8A.
Further, the plurality of valve body communication passages 43 may be arranged at intervals in the circumferential direction of the shaft portion 41. However, as shown in FIGS. 5 and 8A to 8C, the valve body communication passages 43 should be arranged at equal intervals. More preferred.

[Second Embodiment]
Next, a safety valve, a compressor, a tank, a brake control device, a brake system, and a vehicle according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, components that are the same as those in the first embodiment are given the same reference numerals in the drawing, and descriptions thereof are omitted.

As shown in FIG. 9, the safety valve 20 </ b> A of the present embodiment includes a housing 21, a valve body 22 </ b> A, an urging member 23 (see FIG. 3), and a seal member 24 similar to those of the first embodiment.
Further, similarly to the first embodiment, a valve body communication passage 43A for communicating the high pressure port 32 with the low pressure chamber 31 is formed in the shaft portion 41 of the valve body 22A. Similar to the first embodiment, the valve body communication passage 43A has an opening 431A that opens in a part of the outer circumferential direction, opens at the axial end of the shaft 41, and communicates with the high-pressure port 32. ing. Further, in the plan view shape of the opening 431A of the valve body communication passage 43A viewed from the outer peripheral side of the shaft portion 41, the edge 432A of the opening 431A located on the rear side in the insertion direction of the shaft portion 41 with respect to the high pressure port 32. Is linearly extended along the circumferential direction of the seal member 24 as in the first embodiment.

However, the valve body communication passage 43A of the present embodiment includes a passage hole 433A that opens in the axial end surface 41a of the shaft portion 41 facing the high-pressure port 32 side, and an inner periphery of the passage hole 433A from the outer periphery of the shaft portion 41. And an opening 431A penetrating to the periphery. The passage hole 433A is formed only in the radially inner region of the axial end surface 41a of the shaft portion 41. For this reason, the opening 431A of the valve body communication passage 43A of the present embodiment does not extend to the end surface 41a of the shaft portion 41 in the axial direction.

In FIG. 9, the plan view shape of the opening 431 </ b> A of the valve body communication passage 43 </ b> A viewed from the outer peripheral side of the shaft portion 41 is formed in a rectangular shape. However, the opening 431A may be formed in any shape as long as the edge 432A of the opening 431A positioned at least on the rear side in the insertion direction of the shaft portion 41 is formed in a straight line.
A plurality of openings 431A of the valve body communication passage 43A may be arranged at intervals in the circumferential direction. In this case, the plurality of openings 431A may be arranged at equal intervals in the circumferential direction of the shaft portion 41, for example. In addition, the end edges 432A of the plurality of openings 431A located on the rear side in the insertion direction of the shaft portion 41 may coincide with each other with respect to the position of the shaft portion 41 in the axial direction.

In FIG. 9, the third large diameter portion 423 of the valve body 22 </ b> A comes into contact with the end surface on the second space region 332 side of the third space region 333 of the accommodation space 33 due to the urging force of the urging member 23. (See FIG. 3). In this state, the sealing member 24 described above is positioned on the rear side in the insertion direction of the shaft portion 41 with respect to the end edge 432A of the opening portion 431A of the valve body communication passage 43A. For this reason, the seal member 24 is in close contact with the entire circumferential direction of the outer periphery of the shaft portion 41, and the high pressure port 32 and the valve body communication passage 43 </ b> A are partitioned from the low pressure chamber 31. That is, the high pressure port 32 does not communicate with the low pressure chamber 31.

On the other hand, in a state in which the valve body 22A moves to the rear side in the insertion direction of the shaft portion 41 and the edge 432A of the opening 431A of the valve body communication passage 43A moves to the low pressure chamber 31 side rather than the seal member 24, 32 communicates with the low-pressure chamber 31 through the opening 431A of the valve body communication passage 43A. The opening area of the opening 431A of the valve body communication path 43A that connects the valve body communication path 43A to the low pressure chamber 31 side is an area that is located on the rear side in the insertion direction of the shaft portion 41 with respect to the seal member 24 in the opening 431A. is there.

The safety valve 20A of the present embodiment configured as described above can be incorporated into the compressor 13, the tank 14, and the brake control device 16 (see FIG. 2) of the brake system 3 as in the case of the first embodiment. It is.
The operation of the safety valve 20A of the present embodiment is the same as that of the first embodiment.
And according to the safety valve 20A of this embodiment, the compressor 13 provided with this, the tank 14, the brake control apparatus 16, the brake system 3, and the vehicle 1, there exists an effect similar to 1st embodiment.

[Third embodiment]
Next, a compressor, a tank, a brake control device, a brake system, and a vehicle according to a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals in the drawing, and the description thereof is omitted.

As shown in FIGS. 10 and 11, the safety valve 20 </ b> B of this embodiment includes a housing 21 </ b> B, a valve body 22 </ b> B, a biasing member 23 (see FIG. 3), and a seal member 24 similar to those of the first embodiment. However, in the safety valve 20B of the present embodiment, the valve body communication passages 43 and 43A (see, for example, FIGS. 4 and 9) are not formed in the valve body 22B.
In the present embodiment, a housing communication path 36B for communicating the low pressure chamber 31 with the high pressure port 32B is formed in the high pressure port 32B of the housing 21B. The housing communication path 36B has an opening 361B that opens in a part of the inner circumferential direction of the high-pressure port 32B. Further, the housing communication path 36 </ b> B opens to the low pressure chamber 31 and communicates with the low pressure chamber 31.
In the plan view shape of the opening 361B of the housing communication path 36B viewed from the inner peripheral side of the high-pressure port 32B, the end edge 362B of the opening 361B positioned on the front side in the insertion direction of the shaft portion 41 with respect to the high-pressure port 32B is the high-pressure port 32B. It extends linearly in the circumferential direction of the high-pressure port 32B so as to be orthogonal to the axis C1.

The housing communication path 36B of the present embodiment is formed in a groove shape that is recessed from the inner periphery of the high-pressure port 32B and extends in the axial direction of the high-pressure port 32B. One end portion in the extending direction of the housing communication path 36B formed in a groove shape opens to the low pressure chamber 31 side. That is, the opening 361B of the housing communication path 36B that opens to the inner periphery of the high pressure port 32B is connected to the opening of the housing communication path 36B with respect to the low pressure chamber 31.
Further, in the present embodiment, the planar view shape of the opening 361B of the groove-shaped housing communication path 36B viewed from the inner peripheral side of the high-pressure port 32B is a rectangular shape.

Furthermore, a plurality of groove-shaped housing communication paths 36B are formed in the high-pressure port 32B of the present embodiment. The plurality of housing communication paths 36B are arranged at intervals in the circumferential direction of the high-pressure port 32B. Specifically, the plurality of housing communication paths 36B are arranged at equal intervals in the circumferential direction of the high-pressure port 32B. That is, a plurality of openings 361B of the housing communication path 36B are arranged at equal intervals in the circumferential direction of the high-pressure port 32B on the inner periphery of the high-pressure port 32B. 10 and 11, four housing communication paths 36B are formed, but the present invention is not limited to this.
Further, the end edges 362B of the plurality of openings 361B located on the front side in the insertion direction of the shaft portion 41 coincide with each other with respect to the position of the high-pressure port 32B in the axial direction.

The seal member 24 of the present embodiment is formed in the same ring shape as in the first embodiment, and fills the gap between the inner periphery of the high pressure port 32B and the outer periphery of the shaft portion 41 inserted into the high pressure port 32B. Further, the seal member 24 of the present embodiment can be elastically deformed similarly to the first embodiment.
However, the seal member 24 of the present embodiment is provided on the outer periphery of the shaft portion 41 facing the inner periphery of the high-pressure port 32B. The seal member 24 is held on the outer periphery of the shaft portion 41 by being inserted into a groove formed on the outer periphery of the shaft portion 41. Further, the seal member 24 is provided such that its axis coincides with the high-pressure port 32B and the axes C1 and C2 of the shaft portion 41. For this reason, the edge 362B located in the insertion direction front side of the shaft portion 41 in the opening portion 361B of the housing communication path 36B described above extends linearly along the circumferential direction of the seal member 24.

In FIG. 10, the third large diameter portion 423 of the valve body 22 </ b> B comes into contact with the end surface on the second space region 332 side of the third space region 333 of the accommodation space 33 by the urging force of the urging member 23. (See FIG. 3). In this state, the sealing member 24 described above is positioned on the front side in the insertion direction of the shaft portion 41 with respect to the end edge 362B of the opening 361B of the housing communication path 36B. Therefore, the seal member 24 is in close contact with the entire inner circumferential direction of the high pressure port 32B, and the high pressure port 32B is partitioned from the housing communication path 36B and the low pressure chamber 31. That is, the high pressure port 32 </ b> B does not communicate with the low pressure chamber 31.
On the other hand, as shown in FIG. 12, the valve body 22B moves to the rear side in the insertion direction of the shaft portion 41, and the seal member 24 moves to the low pressure chamber 31 side rather than the edge 362B of the opening 361B of the housing communication path 36B. In this state, the high pressure port 32B communicates with the low pressure chamber 31 via the opening 361B of the housing communication path 36B. An opening region of the opening 361B that allows the housing communication path 36B to communicate with the high-pressure port 32B is a region located on the front side in the insertion direction of the shaft portion 41 with respect to the seal member 24 in the opening 361B.

The safety valve 20B of the present embodiment configured as described above is incorporated into the compressor 13, the tank 14, and the brake control device 16 (see FIG. 2) of the brake system 3, similarly to the safety valve 20 of the first embodiment. Is possible.

Next, operation | movement of the safety valve 20B of this embodiment mentioned above is demonstrated.
In a state where the pressure in the high-pressure port 32B acting on the end surface 41a of the shaft portion 41 facing the high-pressure port 32B is smaller than the urging force of the urging member 23, the valve body 22B is disposed at the position shown in FIG. In this state, since the seal member 24 is in close contact with the entire circumferential direction of the outer periphery of the shaft portion 41, the low pressure chamber 31 and the housing communication path 36B are partitioned from the high pressure port 32B, and the high pressure port 32B does not communicate with the low pressure chamber 31. . Therefore, even if the pressure in the high pressure port 32B is higher than the pressure on the low pressure chamber 31 side, the air (fluid) in the high pressure port 32B does not blow out to the low pressure chamber 31.

On the other hand, when the pressure in the high pressure port 32B acting on the end surface 41a of the shaft portion 41 becomes larger than the urging force of the urging member 23, the valve body 22B is moved to the urging member 23 as shown in FIG. It moves to the rear side in the insertion direction of the shaft portion 41 against the urging force. When the seal member 24 moves to the rear side in the insertion direction of the shaft portion 41 from the end 362B of the opening 361B of the housing communication path 36B along with the movement of the valve body 22B, the high pressure port 32B opens to the housing communication path 36B. The first and second space regions 331 and 332 (pop-up chamber 335) of the low pressure chamber 31 communicate with each other via the portion 361B. An opening region of the opening 361B that allows the housing communication path 36B to communicate with the high-pressure port 32B is a region located on the front side in the insertion direction of the shaft portion 41 with respect to the seal member 24 in the opening 361B. Thus, the low pressure chamber 31 communicates with the high pressure port 32 </ b> B, whereby high pressure air (high pressure air) in the high pressure port 32 </ b> B blows out to the low pressure chamber 31.

Further, when the high pressure air blows out to the first and second space regions 331 and 332 of the low pressure chamber 31, the pressure receiving area of the valve body 22B on which the pressure of the high pressure air acts increases as in the case of the first embodiment. The valve body 22B further moves to the rear side in the insertion direction of the shaft portion 41 against the urging force of the urging member 23. As a result, the opening area of the opening 361B of the housing communication path 36B that opens to the high-pressure port 32B side is expanded, and a large amount of high-pressure air is blown out from the high-pressure port 32B to the first and second space regions 331 and 332 of the low-pressure chamber 31. be able to.
Further, the high-pressure air blown out to the first and second space regions 331 and 332 is discharged to the outside through the low-pressure port 34 and the back pressure port 35 (see FIG. 3) as in the first embodiment.

As described above, according to the safety valve 20B of the present embodiment, the same effects as those of the first embodiment can be obtained.
That is, since the high-pressure port 32B can be partitioned from the low-pressure chamber 31 by the seal member 24 provided on the outer periphery of the shaft portion 41, the safety valve 20B, the compressor 13, the tank 14, and the brake control device 16 including the safety valve 20B. In addition, the brake system 3 and the vehicle 1 can be easily manufactured and maintained.
The seal member 24 that partitions the high pressure port 32B and the low pressure chamber 31 contacts the outer periphery of the shaft portion 41 and does not contact the end surface 41a of the shaft portion 41 on which the pressure of the high pressure air in the high pressure port 32B acts. For this reason, the area of the end surface 41 a of the shaft portion 41 on which the pressure of the high-pressure air acts is not affected by the seal member 24 and does not change. Thereby, it can suppress that the pressure regulation value of the safety valve 20B fluctuates.

Furthermore, according to the safety valve 20 </ b> B of the present embodiment, the end edge 362 </ b> B of the opening 361 </ b> B of the housing communication path 36 </ b> B positioned on the front side in the insertion direction of the shaft portion 41 extends linearly along the circumferential direction of the seal member 24. Yes. For this reason, at the moment when the seal member 24 moves to the low pressure chamber 31 side from the edge 362B of the opening 361B, a large opening area of the opening 361B opening to the high pressure port 32B side can be secured. Thus, at the moment when the opening 361B of the housing communication path 36B opens to the high pressure port 32B side, a large amount of high pressure air in the high pressure port 32B is quickly blown out to the first and second space regions 331 and 332 of the low pressure chamber 31. Can be made.

In addition, since the pressure received by the large-diameter portion 42 of the valve body 22B is rapidly increased by the rapid blow-out of high-pressure air to the low-pressure chamber 31 side, the valve body 22B is rapidly moved to the rear side in the insertion direction of the shaft portion 41. Can be made. That is, the quick pop-up operation of the valve body 22B can be realized.
Thereby, the opening area of the opening 361B of the housing communication path 36B that opens to the high-pressure port 32B side is further enlarged, and a larger amount of high-pressure air can be quickly blown out to the low-pressure chamber 31 side. In other words, it is possible to quickly reduce the air pressure in a container or a pipe connected to the high pressure port 32B (in this embodiment, in the compressor 13, the tank 14, the pipe of the brake control device 16, etc.). Become.

As mentioned above, although the detail of embodiment of this invention was demonstrated, this invention is not limited to embodiment mentioned above, A various change can be added in the range which does not deviate from the meaning of this invention.

For example, the end edge of the opening of the valve body communication path or the housing communication path may not extend linearly and may be rounded. That is, the opening of the valve body communication path and the housing communication path may be formed in a circular shape, for example.
Further, the low pressure chamber of the housing may be formed so as not to have, for example, a housing space, a low pressure port, and a back pressure port, and communicate directly with the outside (atmosphere).

Furthermore, the safety valve according to the embodiment of the present invention is not limited to being incorporated in the compressor, tank, and brake control device provided in the brake system of the above embodiment, but is incorporated in any compressor, tank, and brake control device. It's okay.
For example, the tank incorporating the safety valve according to the embodiment of the present invention only needs to store high-pressure air supplied from the outside. In addition, the brake control device incorporating the safety valve according to the embodiment of the present invention can adjust the pressure of high-pressure air supplied from the outside and then supply high-pressure air to the brake device that brakes the vehicle body. Good.

Moreover, although the said embodiment demonstrated the example which applied the safety valve which concerns on embodiment of this invention to a rail vehicle as a vehicle, it is also possible to apply to the vehicle of the track-type traffic system which drive | works on a track | truck with a rubber tire. However, the present invention can also be applied to a vehicle of a traffic system that travels on other travel routes.

According to the above-described aspect of the present invention, it is possible to easily manufacture and maintain the safety valve. It is also possible to suppress fluctuations in the pressure regulation value of the safety valve.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Vehicle main body 3 Brake system 13 Compressor 14 Tank 15 Brake device 16 Brake control device 20, 20A, 20B Safety valve 21, 21B Housing 22, 22A, 22B Valve body 23 Energizing member 24 Seal member 31 Low pressure chamber 32, 32B High pressure port 36B Housing communication path 361B Opening part 362B End edge 41 Shaft part 41a End face 42 Large diameter part 43, 43A Valve body communication path 431, 431A Opening part 432, 432A End edge 433A Passage hole

Claims (12)

1. A housing having a low-pressure chamber communicating with the outside, and a high-pressure port opening to the low-pressure chamber;
   A shaft portion inserted into the high-pressure port from the low-pressure chamber side, and a large-diameter portion provided integrally with the shaft portion and having a larger diameter than the high-pressure port and disposed in the low-pressure chamber. A valve body that is movable in the axial direction of the shaft portion with respect to the housing;
   A biasing member that biases the valve body in the insertion direction of the shaft portion with respect to the high-pressure port;
   An annular seal member provided on the inner periphery of the high-pressure port facing the outer periphery of the shaft portion, and filling a gap between the outer periphery of the shaft portion and the inner periphery of the high-pressure port;
   A valve body communication passage is formed in the shaft portion. The valve body communication passage has an opening portion that opens at a part of a circumferential direction of the outer periphery of the shaft portion and also opens at an axial end portion of the shaft portion and communicates with the high-pressure port. Safety valve.
2. In the plan view shape of the opening of the valve body communication passage viewed from the outer peripheral side of the shaft portion, an edge of the opening located on the rear side in the insertion direction of the shaft portion with respect to the high-pressure port is the seal. The safety valve according to claim 1, wherein the safety valve extends linearly along the circumferential direction of the member.
3. The valve body communication passage is formed in a groove shape extending in the axial direction of the shaft portion on the outer periphery of the shaft portion,
   The safety valve according to claim 1 or 2, wherein one end portion in the extending direction of the valve body communication passage formed in a groove shape opens in an end surface in the axial direction of the shaft portion located on the high pressure port side.
4. 4. The safety valve according to claim 3, wherein the shape of the opening of the valve body communication passage viewed from the outer peripheral side of the shaft portion is a rectangular shape.
5. A housing having a low-pressure chamber communicating with the outside, and a high-pressure port opening to the low-pressure chamber;
   A shaft portion inserted into the high-pressure port from the low-pressure chamber side, and a large-diameter portion provided integrally with the shaft portion and having a larger diameter than the high-pressure port and disposed in the low-pressure chamber. A valve body that is movable in the axial direction of the shaft portion with respect to the housing;
   A biasing member that biases the valve body in the insertion direction of the shaft portion with respect to the high-pressure port;
   An annular seal member provided on the outer periphery of the shaft portion facing the inner periphery of the high-pressure port, and filling a gap between the outer periphery of the shaft portion and the inner periphery of the high-pressure port;
   A safety valve having an opening that opens at a portion of the inner circumference of the high-pressure port and a housing communication passage that opens to the low-pressure chamber and communicates with the low-pressure chamber.
6. In the plan view shape of the opening of the housing communication path as viewed from the inner peripheral side of the high-pressure port, an edge of the opening located on the front side in the insertion direction of the shaft portion with respect to the high-pressure port is the seal member. The safety valve according to claim 5, wherein the safety valve extends linearly along the circumferential direction.
7. The safety valve according to any one of claims 1 to 6, wherein the seal member is elastically deformable.
8. A compressor that compresses an external fluid to generate a high-pressure fluid,
   A compressor incorporating the safety valve according to any one of claims 1 to 7.
9. A tank for storing high-pressure fluid supplied from the outside,
   A tank incorporating the safety valve according to any one of claims 1 to 7.
10. A brake control device that adjusts the pressure of a high-pressure fluid supplied from outside and supplies the high-pressure fluid to a brake device that brakes a vehicle body with the high-pressure fluid.
    A brake control device incorporating the safety valve according to any one of claims 1 to 7.
11. A compressor that compresses a fluid supplied from the outside to generate a high-pressure fluid;
    A tank for storing the high-pressure fluid supplied from the compressor;
    A brake device for braking the vehicle body with the high-pressure fluid;
    A brake control device for adjusting the pressure of the high-pressure fluid supplied from the tank and supplying the high-pressure fluid to the brake device;
    A safety valve according to any one of claims 1 to 7,
    A brake system in which the safety valve is incorporated in at least one of the compressor, the tank, and the brake control device.
12. A vehicle body having a vehicle body and a traveling carriage capable of traveling on a track or a traveling path;
    A brake system according to claim 11, which brakes the traveling carriage.

Images