JPS6358465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an airtight device for a side sliding door that is suitably employed in railway vehicles, particularly high-speed railway vehicles such as Shinkansen bullet trains.

When a railway vehicle traveling at high speed enters a tunnel, if the airtightness of the side sliding doors is insufficient, there is a problem in that the air pressure inside the vehicle increases rapidly, causing discomfort to passengers. In order to prevent this, the present applicant has already applied for an airtight device for side sliding doors as shown in Fig.
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That is, in this airtight device, when the air cylinder type side sliding door opener 102 is operated by the supply of compressed air from the air source 101 and the side sliding door 103 is closed,
Compressed air is supplied from the air source 101 through the electromagnetic switching valve 120 into the air cylinder 105 of the pneumatic-hydraulic pressure converter 104, and the large piston 106 that receives this air pressure presses the small piston 107 for generating hydraulic pressure. Both move to the left in the figure, and this small piston 107 is inserted into the hole 109 of the valve 108.
When closed, the communication between the hydraulic cylinder 110 and the liquid reservoir 111 of the pneumatic-hydraulic pressure converter 104 is cut off, so that the pressure liquid in the hydraulic cylinder 110 pushes up the pilot piston 112 and pushes up the check valve 113 and the liquid reservoir 111. Pressure fluid flows into the side sliding door holding cylinder 115 through the pressure fluid supply drain line 114, and the rod 117 of the piston 116 that receives this fluid pressure presses the side sliding door 103 against the airtight packing 118. While this side sliding door is being pressed, the pilot piston 1
12 is pushed up by the hydraulic pressure from the hydraulic cylinder 110, and the check valve 113 is closed by the force of the spring 119, so the pressure liquid in the side sliding door holding cylinder 115 does not flow back to the hydraulic cylinder 110. I can't do it.
Therefore, even if a shockingly large external pressure acts on the side sliding door 103, the side sliding door 103 will not be pushed back, so that good airtightness can be maintained.

However, in this airtight device, since the stopper 125 of the valve 108 is provided in the middle of the hydraulic cylinder 110, it is necessary to form a notch groove 126 corresponding to the stroke s in the small piston 107, as shown in FIG. For this reason, the small piston 107 becomes longer by the length of the notched groove 126, and therefore the hydraulic cylinder 110 becomes longer, resulting in a drawback that the pneumatic pressure-hydraulic pressure converter 104 becomes larger as a whole.

This invention was developed in view of the above drawbacks.
It is an object of the present invention to provide an airtight device for a side sliding door for a railway vehicle, which has a structure that does not require the provision of a notched groove in a piston for pressure conversion, and which reduces the size of a pneumatic pressure-hydraulic pressure converter.

That is, the present invention provides an airtight device for a side sliding door for a railway vehicle that includes an air pressure-hydraulic pressure converter that converts air pressure into hydraulic pressure, and a side sliding door holding cylinder that is operated by the hydraulic pressure generated by the converter. The pneumatic-hydraulic pressure converter includes a pressure converting piston, which has a hydraulic piston portion that slides within the hydraulic cylinder at one end and a pneumatic piston portion that slides within the air cylinder at the other end. an on-off valve provided at one end of the pressure conversion piston to open and close a liquid passage in the pressure conversion piston that connects the inside of the hydraulic cylinder and the liquid reservoir; and an on-off valve that fits into the inside of the pressure conversion piston from an end of the air cylinder; and an on-off valve contact rod extending from the hydraulic cylinder side toward the air cylinder side to a position inside the pressure conversion piston that opens the on-off valve when the pressure conversion piston operates to the end of its stroke. This relates to an airtight device for side sliding doors for railway vehicles. In this way, the opening/closing valve contact rod that fits inside the pressure converting piston is protruded from the end of the air cylinder, and when the pressure converting piston moves from the hydraulic cylinder side to the air cylinder side and returns to the stroke end point, the opening/closing valve fitting is inserted into the pressure converting piston. If the on-off valve is configured to be opened by a connecting rod, a stopper 1 of the on-off valve will be placed in the middle of the hydraulic cylinder.
25, the piston has a notch groove 1 corresponding to its stroke s.
26, the length of the pressure conversion piston can be shortened by the stroke, and therefore the length of the cylinder can be shortened, so the pneumatic pressure-hydraulic pressure converter can be downsized. It can be done.

Hereinafter, the airtight device of the present invention will be described in detail with reference to Examples.

FIG. 1 is a cross-sectional view of an embodiment of the present invention, and as shown in the figure, the airtight device for the side sliding door for a railway vehicle is as follows:
It is equipped with a gas-liquid pressure converter 1 that converts air pressure into liquid pressure, and a plurality of side sliding door holding cylinders 2 that operate in response to the liquid pressure generated by the converter 1.

This pneumatic-hydraulic pressure converter 1 is provided with a liquid reservoir 3 at the upper part of its main body. This liquid reservoir 3 is maintained at atmospheric pressure, and a filter 5 attached to surround the liquid supply port 4 prevents foreign matter from entering the liquid.

A large-diameter air cylinder 6 and a small-diameter hydraulic cylinder 7 are formed in communication with each other at the bottom of the main body of the pneumatic-hydraulic pressure converter 1, and a single pressure conversion is performed across both cylinders 6 and 7. Piston 8 is built-in. This pressure conversion piston 8 has a small diameter hydraulic piston part 9 that slides inside the hydraulic cylinder 7 at one end, and a large diameter air piston part 10 that slides inside the air cylinder 6 at the other end. The air cylinder 6 is pressed toward the other pressure chamber 13 by a spring 12 stretched in one spring chamber 11 of the air cylinder 6 .

One spring chamber 11 of the air cylinder 6 is connected to the through hole 1
The other pressure chamber 13 is connected to the supply/exhaust pipe line 15. Then, an electromagnetic switching valve 19 in the middle of this supply/exhaust pipe 15
When the switch is in the switching position 19a, compressed air from the air source 16 is supplied to the pressure chamber 13 of the air cylinder 6 via the air outlet 17, the purification filter 18, the electromagnetic switching valve 19, and the throttle 20, and the electromagnetic switching valve 19 switches. When switched to position 19b, compressed air in pressure chamber 13 is discharged via check valve 21, electromagnetic switching valve 19, and muffler 22.

The pressure conversion piston 8 has a small inner hole 24 into which the on-off valve 23 is fitted from one end, and a large inner hole 2 into which the on-off valve contact rod 25 is fitted from the other end.
6 are formed to communicate with each other, and a through hole 27 for communicating the large inner hole 26 and the spring chamber 11 is further formed. The on-off valve 23 fitted into the small inner hole 24 has a liquid passage groove 28, and includes a spring receiving member 29 fixed to one end of the pressure conversion piston 8 through which liquid can freely pass, and a valve head 30 of the on-off valve 23. The valve seat portion 32 of the pressure converting piston 8 is pressed by a spring 31 stretched between the pressure converting piston 8 and the valve seat portion 32 of the pressure converting piston 8. As shown in the figure, when the valve head 30 is separated from the valve seat 32 at one end of the pressure converting piston 8 and the on-off valve 23 is opened, a liquid passage connecting the liquid reservoir 3 and the hydraulic cylinder 7 is opened. (Liquid reservoir 3 - through hole 14 - spring chamber 11 - through hole 27
- The large inner hole 26 - the liquid passage groove 28 - the hydraulic cylinder 7) are opened, and conversely, when the valve head 30 is seated on the valve seat 32 and closed, the liquid passage is cut off. . Further, the opening/closing valve contact rod 25 fitted into the large inner hole 26 of the pressure conversion piston 8 is provided to protrude from the cylinder lid 33 at the end of the air cylinder 6. The opening/closing valve contact rod 25 is fitted into the large inner hole 26 from the other end thereof, and a taper 34 is provided at the tip portion of the opening/closing valve contact rod 25 so as not to close the through hole 27. This opening/closing valve contact rod 25 operates when the pressure converting piston 8 operates from the hydraulic cylinder 7 side toward the air cylinder 6 side to the end of its stroke as shown in the figure.
The on-off valve 23 is opened by pushing it toward the hydraulic cylinder 7 against a spring 31.

Further, between the hydraulic cylinder 7 and the liquid supply/drainage line 35, there is provided a check valve 36 whose forward direction is from the hydraulic cylinder 7 to the liquid supply/drainage line 35, and this check valve 3.
6 is provided with a pilot piston 37 that opens when the pressure of the hydraulic cylinder 7 decreases, and the liquid supply/drainage pipe 35 branches in the middle and is connected to each side sliding door holding cylinder 2. These check valve 36, pilot piston 37, and side sliding door holding cylinder 2 are the same as those of the conventional device shown in FIG.
When hydraulic pressure is generated in the hydraulic cylinder 7, the hydraulic pressure pushes up the pilot piston 37 against the spring 38 and pushes down the check valve 36 against the spring 39, thereby opening the fluid supply/drainage line 35. The piston 40 of the side sliding door holding cylinder 2 receives this hydraulic pressure and moves toward the side sliding door 42 against the spring 41, and the piston rod 43 moves the side sliding door 42. It is pressed against an airtight packing 44 around the entrance/exit. And the side sliding door 42
During pressing, the check valve 36 is closed by the force of the spring 39, so the pressure fluid in each side sliding door holding cylinder 2 cannot return to the hydraulic cylinder 7, and therefore a large external pressure is applied to the side sliding door. 42, the side sliding door 42 is not pushed back and can maintain airtightness.

The operation of the airtight device as described above will be explained next.

When the electromagnetic switching valve 19 is in the switching position 19b, the compressed air in the pressure chamber 13 of the air cylinder 6 of the pneumatic-hydraulic pressure converter 1 is discharged as shown in FIG. 12 from the hydraulic cylinder 7 side toward the air cylinder 6 side until the end of the stroke, so the on-off valve 23 is opened and the liquid reservoir 3 and the hydraulic cylinder 7 are in communication. Since the check valve 36 is also opened by the pilot piston 37, the liquid in the side sliding door holding cylinder 2 returns to the hydraulic cylinder 7, and the pressure on the side sliding door 10 is released.

Now, when the electromagnetic switching valve 19 is switched to the switching position 19a in the state of release of pressure shown in FIG. Since the pressure chamber 13 of the air cylinder 6 of the pneumatic-to-hydraulic converter 1 is supplied through the air pressure converter 1, the pressure conversion piston 8 starts to move against the spring 12 towards the hydraulic cylinder 7. At this time, the on-off valve 23 has its valve head 3
0 until the valve seat portion 32 at one end of the pressure conversion piston 8 comes into contact with the opening/closing valve contact rod 2 by the force of the spring 29.
It remains pressed against the tip of 5. and,
Due to the movement of this pressure converting piston 8, the on-off valve 2
When the valve head 30 of No. 3 is seated on the valve seat portion 32, the liquid passage connecting the liquid reservoir portion 3 and the hydraulic cylinder 7 is cut off, so that hydraulic pressure is generated within the hydraulic cylinder 7. When the hydraulic pressure is generated in this way, the hydraulic pressure inside the hydraulic cylinder 7 causes the pilot piston 37 to move against the spring 3.
8 and push up the check valve 36 against the spring 3.
9 and flows into each side sliding door holding cylinder 2 through the supply/drainage pipe 35 according to the stroke amount of the pressure converting piston 8 . Therefore, the piston 40 of each presser cylinder 2 moves toward the side sliding door 42 against the spring 41 in response to hydraulic pressure, and the tip of the piston rod 43 protruding from each presser cylinder 2 seals the side sliding door 42 with the airtight gasket 44. Press it to make it airtight. Then, as described above, the backflow of the pressure fluid in each side sliding door holding cylinder 2 is caused by the check valve 37 until the pilot piston 37 opens the check valve 36 due to a drop in the fluid pressure in the hydraulic cylinder 7. Good airtightness is maintained even if a large impact external pressure, such as that generated when entering a tunnel, acts on the side sliding door 42.

When the electromagnetic switching valve 19 switches again to the switching position 19b from the state in which the side sliding door 42 is pressed as described above, the compressed air in the pressure chamber 13 of the air cylinder 6 flows to the check valve 21, the electromagnetic switching valve 19, and the muffler. 22, the pressure converting piston 8 starts to operate from the hydraulic cylinder 7 side toward the air cylinder side by the force of the spring 12. As a result, the hydraulic pressure in the hydraulic cylinder 7 drops, and the pilot piston 37, which had been pushed up by this hydraulic pressure, is pushed down by the force of the spring 38 and opens the check valve 36, so that each side sliding door opens. The pressure fluid in the presser cylinder 2 is returned to the hydraulic cylinder 7. When the pressure fluid in the side sliding door holding cylinder 2 is returned in this manner, the piston 40 of each holding cylinder 2 is pushed back by the force of the spring 41, the piston rod 43 is retracted, and the pressing of the side sliding door 42 is released. When the pressure conversion piston 8 is fully operated to the end of its stroke as shown in the figure, the on-off valve 23
contacts the opening/closing valve contact rod 25, and the valve head 30 is separated from the valve seat 32 and opened, so that the liquid reservoir 3
The liquid reservoir 3, the hydraulic cylinder 7, and the side sliding door holding cylinder 2 are all at atmospheric pressure.

FIG. 2 is a sectional view of another embodiment of the present invention, and in the pneumatic-hydraulic pressure converter of FIG. 1, one spring chamber 11 of the air cylinder 6 is connected to the liquid reservoir 3 and the hydraulic cylinder. In contrast, in the pneumatic-hydraulic pressure converter 1 shown in FIG. The difference is that the liquid passage path is formed separately.

That is, the pneumatic-hydraulic pressure converter shown in FIG. An annular gap 48 is formed between the hydraulic piston part 9 and the sealing material 47.
A through hole 49 is provided in the hydraulic cylinder wall to communicate this annular gap 48 with the liquid reservoir 3, and a large inner hole 2 of the pressure converting piston 8 is formed in the annular gap 48.
By providing a through hole 50 in the pressure converting piston 8 that communicates with the piston 6, a liquid passage is formed. The rest of the configuration is the same as that of the embodiment shown in FIG. 1, and since there is no substantial change in operation, the explanation will be omitted.

As described above, in the air-tight device for a side sliding door for a railway vehicle according to the present invention, the on-off valve contact rod 25 is inserted into the pressure converting piston 8 from the end of the air cylinder 6, and this piston 8 is connected to the hydraulic cylinder 7. The opening/closing valve 23 for generating hydraulic pressure can be opened by the opening/closing valve contact rod 25 when the valve is operated toward the end of the stroke toward the air cylinder 6 side.
Unlike conventional pneumatic-to-hydraulic pressure converters, which have a stopper for contacting the opening/closing valve in the middle of the hydraulic cylinder, it is no longer necessary to provide a notched groove in the piston for the stroke, so the length of the pressure converting piston 8 is cut out. Since the length of the groove can now be shortened and the length of the cylinder can also be shortened accordingly, there is an effect that the pneumatic pressure-hydraulic pressure converter can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view of another embodiment of the invention, Fig. 3 is a sectional view of a conventional example, and Fig. 4 is a partially enlarged view of the conventional example. It is. 1... Air pressure-hydraulic pressure converter, 2... Side sliding door holding cylinder, 3... Liquid reservoir, 6... Air cylinder,
7...Hydraulic cylinder, 8...Pressure conversion piston,
9... Hydraulic piston, 10... Air piston, 2
3... Opening/closing valve, 25... Opening/closing valve contact rod, 42...
Side sliding door.

Claims (1)

[Claims] 1. Airtightness of a sliding door on the side of a railway vehicle equipped with a pneumatic-hydraulic pressure converter having an air cylinder and a hydraulic cylinder that convert air pressure into liquid pressure, and a side sliding door holding cylinder operated by the liquid pressure generated by this converter. In the device, the pneumatic pressure-hydraulic pressure converter includes a pressure conversion piston having a hydraulic piston portion that slides within the hydraulic cylinder at one end and a pneumatic piston portion that slides within the air cylinder at the other end. and an opening/closing valve provided at one end of the pressure conversion piston to open and close a liquid passage in the pressure conversion piston that connects the inside of the hydraulic cylinder and the liquid reservoir, and a valve that opens and closes a fluid passageway in the pressure conversion piston that connects the inside of the pressure conversion piston with the inside of the pressure conversion piston. and an on-off valve contact rod that is fitted into the pressure conversion piston and extends to a position inside the pressure conversion piston that opens the on-off valve when the pressure conversion piston operates from the hydraulic cylinder side toward the air cylinder side to the end of its stroke. An airtight device for a side sliding door for a railway vehicle, characterized by the following.