JP3348225B2 - Drain valve of air conditioner for railway vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain valve for an air conditioner provided in a drain pipe connected to an air conditioner of a railway vehicle, and more particularly to a drain valve for an air conditioner when the vehicle enters or exits a tunnel or passes an oncoming vehicle. The present invention relates to a drain valve suitable for a high-speed railway vehicle such as a Shinkansen or a magnetic levitation vehicle in which the pressure frequently changes.

[0002]

2. Description of the Related Art In a high-speed railway vehicle such as a Shinkansen, a sudden change in air pressure may be applied to a vehicle body when entering or exiting a tunnel or passing an oncoming vehicle. This air pressure fluctuation changes the pressure inside the vehicle through a drain pipe that discharges the drain generated during cooling and dehumidifying operation of the air conditioner to the outside of the vehicle body,
There is a possibility that passengers may feel uncomfortable or the drain may flow backward through the drain pipe. For this reason, in order to prevent the drain from flowing backward, for example, the drain is temporarily stored in a tank, and a cock provided in the tank is manually operated as appropriate to discharge the drain to the outside of the vehicle body. The driver opens and closes this solenoid valve and closes the drain pipe as necessary, such as when entering or exiting a tunnel, so that the inside of the car is kept airtight or a tank for keeping airtight is separately provided. There are some that discharge drain while always keeping the airtightness inside the vehicle.

[0003]

However, in the configuration in which the drain is temporarily stored in the tank, an operator for manually operating the cock is required to discharge the drain, and furthermore, because of the human operation, They also needed measures to prevent the cock from being forgotten to close. Further, in the case where the driver operates the solenoid valve, there is a possibility that the opening and closing operation of the solenoid valve may be delayed and the airtightness in the drain pipe may not be maintained. And the weight of the vehicle increases.

Accordingly, the present invention is directed to an air conditioner for a railway vehicle capable of reliably preventing a pressure change inside a vehicle body with a simple structure when a sudden pressure fluctuation is applied to the vehicle body due to a passage through a tunnel or the like. It is intended to provide a drain valve.

[0005]

According to the above-mentioned object, a first method is provided.
In the present invention, an inlet for drain introduction is provided at an upper portion of a valve box disposed in a drain pipe, and an outlet for drain discharge is provided at a lower portion thereof, and the valve box is vertically moved by a diaphragm. Into an upper interior chamber and a lower exterior chamber, the interior chamber communicating with the interior of the vehicle body, and the exterior chamber communicating with the exterior of the vehicle, respectively.
The space between the inflow port and the outflow port of each of the inner chamber and the outer chamber is covered with a flexible partition membrane to define an upper valve chamber and a lower valve chamber inside the partition membrane. between the upper valve chamber and a lower valve chamber communicates with the through hole for drain outlet, to form the inlet and the outlet respectively the valve seat to the open end of the diaphragm, no pressure variation in the vehicle body and out Through
The drain is always located between the inlet and the outlet.
When the diaphragm moves up and down due to the pressure difference between the inside and outside of the vehicle body, it sits on one of the inlet and outlet valve seats, and selects the inlet and outlet. A valve body that shuts off the air is fixed .

According to a second aspect of the present invention, there is provided a drain valve including a valve portion disposed in a drain pipe and a diaphragm portion for opening and closing the valve portion, wherein the diaphragm portion is connected to a vehicle interior chamber by a diaphragm. An interior chamber, the interior chamber communicates with the interior of the vehicle body, and the exterior chamber communicates with the exterior of the vehicle. a valve box having an outlet for discharging provided, each provided with a valve seat between the inlet and the outlet of the internal valve box, the valve stem which is connected before Symbol diaphragm to,
The inlet and outlet at normal times when there is no pressure fluctuation inside and outside the vehicle
Located between and allows the flow of drain, diaphragm
When the valve swings due to a pressure difference between the inside and outside of the vehicle body, it is seated on one of the valve seats on the inlet side and the outlet side in conjunction with the diaphragm, and is connected to the inlet and the outlet. A valve body that selectively shuts off the outlet is fixed .

[0007]

According to the first aspect of the present invention, the valve element in the partition membrane is located between the inlet and the outlet during normal times when there is no fluctuation in air pressure inside and outside the vehicle body. The upper and lower valve chambers and the lower valve chamber are allowed to communicate with each other through the drain holes, and the drain generated by cooling or dehumidification of the air conditioner passes through the upstream pipe from the inlet at the upper part of the valve box to the upper valve. Into the lower valve chamber through the through hole, and is discharged to the outside of the vehicle body through the downstream pipe from the outlet at the lower part of the valve box.

When the outside pressure suddenly becomes higher than the inside pressure due to the passage of a tunnel or the passing of an oncoming vehicle, the fluctuating outside pressure enters the outside chamber, and the inside chamber is reduced while pushing up the diaphragm. Then, the valve body moves upward integrally with the diaphragm to sit on the valve seat of the upper valve chamber, and the communication between the inflow port and the outflow port is cut off.

On the other hand, when the pressure outside the vehicle suddenly becomes lower than the pressure inside the vehicle due to fluctuations in the air pressure, the changed pressure inside the vehicle enters the vehicle inside chamber, and the vehicle outside chamber is contracted while pushing down the diaphragm, and the valve is integrated with the diaphragm. The body moves down and sits on the valve seat of the lower valve chamber, and the communication between the inlet and the outlet is cut off.

[0010] In the configuration of the second invention, the diaphragm connected to the valve stem is provided between the inner chamber and the outer chamber in a normal state when there is no air pressure fluctuation inside and outside the vehicle body. Are located between the valve seats on both the inlet side and the outlet side of the valve box to allow communication between the inlet and the outlet, and the drain from the air conditioner flows through the valve from the inlet. It enters the box, passes through the valve body, and is discharged from the outlet of the valve box to the outside of the vehicle body.

When a sudden pressure difference occurs between the in-vehicle pressure and the out-of-vehicle pressure, one of the inner chamber and the outer chamber expands while pushing the diaphragm toward the other chamber. The valve stem and the valve element slide together in the direction of movement of the diaphragm, and the valve element is seated on one of the valve seats, whereby the communication between the inflow port and the outflow port is interrupted.

According to the first and second aspects of the present invention, when the communication between the inlet and the outlet is cut off, the drain from the air conditioner does not flow backward due to the atmospheric pressure fluctuation. It is kept constant regardless of the atmospheric pressure fluctuation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment corresponding to the first invention, and show a drain valve 1 of an air conditioner for a railway vehicle.
Has a valve box 3 interposed in a drain pipe 2 for discharging drain generated during cooling and dehumidification to the outside of the vehicle body.
An upper pipe 2a of the drain pipe 2 and a relay short pipe 2c are connected to the upper case 3a and the lower case 3b, and an inlet 4 of the upstream pipe 2a and a short pipe 2c are provided above and below the inside of the valve box 3. Outlet 5
And are opposed to each other.

The valve case 3 is formed in a bag shape by vertically stacking the upper case 3a and the lower case 3b, and a plurality of through holes 3c are formed in each of the cases 3a and 3b. And a stop ring 3d on the inner surface
Is attached. A lower cover 6 integrally having a downstream pipe 2b of the drain pipe 2 is integrally attached to a lower portion of the valve box 3. When connecting the upper case 3a and the lower case 3b, the lower cover 6 is fixed together with a diaphragm 9 interposed between the two cases 3a and 3b with bolts 7 and nuts 8 together. Due to the attachment, the large-diameter downstream pipe 2b is disposed so as to surround the lower periphery of the short pipe 2c, and a communication chamber 10 communicating with the outside of the vehicle body through the downstream pipe 2b is provided between the lower case 3b and the lower cover 6. Is defined.

The diaphragm 9 is provided in both cases 3 of the valve box 3.
a, 3b, and a diaphragm plate 9b connected by rivets 11 to the inner peripheral side of the flexible film 9a. At the center of the diaphragm plate 9b, a valve body 12 whose upper and lower edges of the cylindrical body are tapered in a tapered shape is held between the inflow port 4 and the outflow port 5, and surrounds the outer periphery of the valve body 12. A plurality of through holes 9c are formed in the diaphragm plate 9b, and tapered valve seats 13 and 14 are formed on the inner surfaces of the opening surfaces of the inflow port 4 and the outflow port 5 facing the valve element 12.

[0016] Diaphragm plate 9b and both cases 3
A coil spring 15 is contracted between a and 3b, and the resilient force of the coil springs 15 and 15 is always in opposition. And is divided into upper and lower parts by diaphragm 9
The upper chamber of the field made the valve casing 3, through hole 3c of the upper case 3a
Through the vehicle interior chamber 16 communicating with the vehicle interior,
Similarly, the outer chamber 1 communicates with the outside of the vehicle body through the lower chamber 3b through the through hole 3c of the lower case 3b and the communication chamber 10.
7 is assumed.

Between the through hole 9c of the diaphragm plate 9b and the coil spring 15, there is provided a flexible partition membrane 18, 1 having one end fitted to the upper case 3a or the lower case 3b.
The other end of 8 is connected with a rivet 19 to define an upper valve chamber 20 in the upper partition membrane 18 and a lower valve chamber 21 in the lower partition membrane 18. The upper valve chamber 20 and the lower valve chamber 21 communicate with each other through a through hole 9c of the diaphragm plate 9b. When the valve body 12 is in the neutral position between the inlet 4 and the outlet 5, the upper valve chamber 20 is closed. Is the inlet 4
, And the lower valve chamber 21 communicates with the outlet 5.

This embodiment is configured as described above.
When there is no change in the pressure inside and outside the vehicle body, the diaphragm 9 is located substantially in the middle of the valve box 3, and the upper and lower partition membranes 18, 1 are disposed.
8 swell outwardly in substantially the same shape (FIG. 1). Valve element 1
Numeral 2 is at a neutral position between the inlet 4 and the outlet 5, and drain generated by cooling or dehumidifying operation of the air conditioner enters the upper valve chamber 20 from the inlet 4 of the upstream pipe 2a and further passes through the diaphragm 9. The lower valve chamber 21 enters through the hole 9c, and the outlet 5 of the short pipe 2c
It is discharged to the outside of the vehicle body through the downstream pipe 2b.

When the outside pressure suddenly becomes higher than the inside pressure due to passage through a tunnel, passing of an oncoming vehicle, or the like, the outside pressure flows backward through the downstream pipe 2b and enters the communication chamber 10, and the lower case 3b From the through hole 3c to the outside chamber 1
7, the diaphragm 9 is pushed up against the resilience of the coil spring 15 of the vehicle interior chamber 16,
The outer chamber 17 expands along with the inner chamber 16 that contracts while discharging the internal pressure from the through hole 3c of the upper case 3a to the inside of the vehicle.

The upper and lower partition films 18 and 18 that partition the upper valve chamber 20 and the lower valve chamber 21 are extended on the lower side with the above-described operation, and the upper side is bent outward with the above operation. Further, the valve element 12 moves upward together with the diaphragm 9, and the diaphragm 9 contacts the stop ring 3 d of the upper case 3 a to restrict the upward movement, and at the same time, the upper edge of the valve element 12 moves to the valve seat 13 of the inflow port 4. When the user sits down and closes the inflow port 4, the communication between the inflow port 4 and the outflow port 5 is interrupted (FIG. 2). As a result, the backflow of the drain in the drain pipe 2 and the valve chambers 20 and 21 of the valve box 3 is prevented, and the pressure outside the vehicle does not flow back through the drain pipe 2, so that the increase in the pressure inside the vehicle is effectively prevented. .

On the other hand, when the pressure inside the vehicle suddenly becomes higher than the pressure outside the vehicle due to the atmospheric pressure fluctuation, and the air in the drain pipe 2 is drawn to the outside of the vehicle body, the diaphragm 9
Is pushed down against the resilience of the coil spring 15 of the vehicle exterior chamber 17, and is reduced while discharging the internal exterior pressure from the hole 3 c to the vehicle exterior. The vehicle interior chamber 16 expands while suctioning the vehicle interior pressure from the through hole 3c.

The upper and lower partition films 18 and 18 extend on the lower side as the diaphragm 9 moves downward, and the upper side bends outward. Further, the valve body 12 moves down together with the diaphragm 9, and the diaphragm 9 comes into contact with the stop ring 3d of the lower case 3b to restrict the downward movement. Outlet 5 sitting on 14
And the communication between the inflow port 4 and the outflow port 5 is interrupted (FIG. 3). As a result, the vehicle interior pressure is not sucked out of the vehicle body through the drain pipe 2, so that the vehicle interior pressure is effectively prevented from lowering.

When there is no change in pressure inside or outside the vehicle,
The diaphragm 9 returns to the neutral position by the resilient force of the two coil springs 15, 15, and the valve body 12 is located between the inflow port 4 and the outflow port 5, thereby allowing the drain to flow.

As described above, according to the present embodiment, even if a sudden pressure change is applied to the vehicle body to cause a pressure difference between the inside and the outside of the vehicle body, the backflow of the drain can be effectively prevented. In addition, since the pressure in the vehicle is kept constant, passengers and occupants do not feel uncomfortable. Furthermore, a sufficient area can be set for the diaphragm that detects the pressure difference between the inside and outside of the vehicle body at the outer periphery with respect to the area of the valve body that is affected by the water pressure from the drain, so that the influence of the fluctuation of the water pressure is suppressed as small as possible.
The operation characteristics as a drain valve can be stably performed.

FIG. 4 shows a second embodiment corresponding to the second invention. The drain valve 30 of the railcar air conditioner includes a valve portion 31 provided in a drain pipe (not shown) and a valve portion 31. And a diaphragm part 32 for driving the opening and closing of the valve part.
The second diaphragm case 34 is integrally connected to the second diaphragm case 34 by a connection pipe 35.

On the central axis of the drain valve 30, a valve stem 3
6 is inserted with its upper and lower ends protruding from the valve box 33 and the diaphragm case 34.
3, a diaphragm 38 in a diaphragm case 34 is fixed to the upper side of the valve rod 36, and the valve element 37 and the diaphragm 38 are connected to the valve rod 36.
And can be moved up and down together.

The valve box 33 includes an upper case 33a and a lower case 3
3b is butted up and down, and both flanges on the outer periphery of the butt portion are connected by connecting bolts 39 and nuts 40. Connecting pipes 33c, 33 connected to the upstream or downstream of the drain pipe are provided in both cases 33a, 33b.
d is formed integrally, and the inlet 41 in the upper connection pipe 33c and the outlet 42 of the downstream connection pipe 33d are vertically displaced. The drain flowing from the inlet 41 is supplied to the valve box 33. It flows down the inside and is discharged from the outlet 42.

Between the inflow port 41 and the outflow port 42 of the valve box 33, valve seats 43 and 44 are provided to face each other. The valve seats 43 and 44 are formed using a ring-shaped tapered surface on the side where the upper case 33a and the lower case 33b meet, and the valve body 37 is disposed between the two valve seats 43 and 44. Normally, it is located substantially in the middle of the valve seats 43 and 44 to allow the flow of drain, and when the valve rod 36 moves up and down by the operation of the diaphragm 38, the packings 37a and 37a on both upper and lower surfaces are used. Are selectively seated on the valve seats 43 and 44 to selectively block communication between the inflow port 41 and the outflow port 42.

In the diaphragm case 34, the case body 34a and the cover plate 34b are butted up and down, and both flanges on the outer periphery of the butted portion are connected to the connecting bolt 4
5 and a nut 46 are integrally connected.
In addition, the diaphragm 38 has large and small diameter diaphragm plates 38b, 38 on both inner circumferential sides of the flexible film 38a.
b, 38c, 38c, the center of which is connected to the valve stem 36, the outer peripheral side of the flexible membrane 38a is bent, and the outer edge thereof is fixed to the inner surface of the cover plate 34b. 47 and a set screw 48
And between the backing plate 49 attached thereto.

The inside of the diaphragm case 34 is divided into upper and lower chambers by the above-mentioned diaphragm 38, and the upper chamber is defined as an inner chamber 50 and the lower chamber is defined as an outer chamber 51. Ventilation pipes 52a and 52b are connected to the case body 34a and the cover plate 34b. The inside chamber 50 communicates with the inside of the vehicle body through the ventilation pipe 52b, and the outside chamber 51 communicates with the outside of the vehicle body through the ventilation pipe 52a. ing.

The valve stem 36 has an upper side supported by a case body 34a and a cover plate 34b of the diaphragm case 34, an intermediate part supported by a connection pipe 35,
The lower end is supported by a holder 53 projecting into the lower case 33b of the valve box 33. A sealing material 54 is fitted on the outer circumference of the connection pipe 35 and the valve stem 36 in the holder 52, respectively, to seal the connection pipe 35 and the holder 53 in a liquid-tight manner. The drain is connected to the valve stem 36 and the connecting pipe 35.
And between the holder 53 and the outside.

The lower end of the valve box 33 and the diaphragm case 34
Brackets 55 and 56 are fixed to the upper end of the valve stem so as to cover the upper and lower ends of the valve stem 36, and an adjustment bolt 57 is fixed to the bracket 55 on the valve box side with the head directed toward the lower end of the valve stem 36. A spring receiving seat 59 is fixed to the bracket 56 on the diaphragm case side so as to face a plug 60 fitted to the upper end of the valve stem 36 by nuts 58 and 58.

A coil spring 61 is contracted between the lower end of the valve stem 36 and the head of the adjustment bolt 57,
A coil spring 62 is contracted between the plug 60 and the spring receiving seat 59. At both ends of the valve stem 36, the coil spring 6
The diaphragm 38 is located at a substantially intermediate position between the inner chamber 50 and the outer chamber 51, and the valve body 37 is moved between the valve seats 43 and 44. keeping. When the adjusting nut 57 is rotated by loosening the fixing nuts 58, 58, the coil springs 61,
The resilience of 62 is changed, the valve rod 36 moves up or down, and the valve element 37 can be adjusted to the position on the inflow side valve seat 43 side or the outflow side valve seat 44 side.

In this embodiment constructed as described above, when there is no change in the pressure inside and outside the vehicle body, the diaphragm 38 is in the neutral position where the inner chamber 50 and the outer chamber 51 are not expanded and contracted, and the valve body 37 is moved to the valve seat. 43, 44, the inlet 41 and the outlet 4 of the connecting pipes 33c, 33d.
2 is allowed, and the drain generated in the cooling or dehumidifying operation of the air conditioner enters the valve box 33 through the inflow port 41 and is discharged to the outside of the vehicle body through the outflow port 42.

When the outside pressure suddenly becomes higher than the inside pressure, the outside air pressure enters the outside chamber 51 through the ventilation pipe 52a, and the whole of the diaphragm 38 is moved upward to the inside chamber 50 while the outside chamber 51 is moved upward. To expand. Next, the upward movement of the diaphragm 38 causes the valve stem 36 connected to the diaphragm 38 to move upward against the resilience of the coil spring 62 above, and further the valve body 37
Is linked to the valve stem 36, and the packing 3 on the upper side of the valve body 37 is
7a is seated on the valve seat 43 on the inflow side, shuts off the communication between the inflow port 41 and the outflow port 42, and the backflow of the drain and the increase in the vehicle interior pressure are effectively prevented.

On the other hand, when the in-vehicle pressure suddenly becomes higher than the out-of-vehicle pressure, the in-vehicle pressure enters the in-vehicle chamber 50 through the ventilation pipe 52b, and the whole of the diaphragm 38 is moved down to the out-of-vehicle chamber 51 side. To expand. The valve stem 36 moves downward integrally with the downward movement of the diaphragm 38 against the resilience of the coil spring 61 below. The gasket 37a on the side seats on the valve seat 44 on the outflow port side, and cuts off the communication between the inflow port 41 and the outflow port 42, thereby effectively preventing a decrease in the vehicle interior pressure.

When there is no change in pressure inside or outside the vehicle,
The resilient forces of the two coil springs 61 and 62 antagonize, the diaphragm 38 returns to the neutral position, and the valve body 37 is located between the inlet-side valve seat 43 and the outlet-side valve seat 44, so that the drain is closed. Distribution will be allowed.

In the drain valve 30 of this embodiment, a valve box 33 through which drain flows and a diaphragm 38 that operates by pressure changes inside and outside the vehicle body are vertically separated, so that the flow direction of the drain is perpendicular to the valve operation. As a result, the influence of the water pressure of the drain on the valve operation can be minimized, and the operation can be performed more stably.

In the first and second embodiments, the valve element in the valve box is held between the two valve seats by the resilient force of the coil spring. If the diaphragm is provided with a restoring force by increasing the rigidity of the diaphragm, the coil spring used in the embodiment can be omitted. Furthermore, the drain valve of the second invention described in the second embodiment can be used upside down or used sideways, and has high versatility.

[0040]

The drain valve of the air conditioner for a railway vehicle according to the present invention has a drain inlet at an upper portion of a valve box provided in a drain pipe and a drain outlet at a lower portion facing the inlet. Outlet, and the valve box is defined by a diaphragm into an upper interior chamber and a lower exterior chamber, and the interior chamber communicates with the interior of the vehicle body and the exterior chamber communicates with the exterior of the vehicle. The space between the inlet and the outlet of the inner chamber and the outer chamber is respectively covered with a flexible partition membrane to define an upper valve chamber and a lower valve chamber inside the partition membrane. The upper valve chamber and the lower valve chamber communicate with each other through a drain outflow hole, and a valve seat is formed at each of the open ends of the inflow port and the outflow port. The diaphragm moves up and down due to the pressure difference between the inside and outside of the vehicle. In conjunction with the above, a valve body that sits on one of the valve seats of the inflow port and the outflow port and selectively shuts off the inflow port and the outflow port is disposed, so that a sudden change in air pressure outside the vehicle body is provided. In addition, even if a pressure difference occurs between the inside and outside of the vehicle body, the backflow of drain can be effectively prevented, and the inside pressure of the vehicle is kept constant, so that passengers and occupants do not feel uncomfortable . Furthermore, since the diaphragm has a sufficient area to detect the pressure difference between the inside and outside of the vehicle body at the outer periphery of the valve body, which is affected by the water pressure from the drain, the effect of the water pressure fluctuation is minimized. As a result, the operation characteristics of the drain valve can be stably performed.

The drain valve includes a valve portion disposed in the drain pipe, and a diaphragm portion for driving the valve portion to open and close. The diaphragm portion is connected to the inner chamber and the outer chamber by the diaphragm. An inlet for introducing a drain from an air conditioner to the valve portion, and an outlet for discharging the drain to the outside of the vehicle body. A valve body having a valve seat between the inflow port and the outflow port inside the valve box, and a valve body connected between the two valve seats via the diaphragm and a valve rod. The valve body is interlocked with a diaphragm that swings due to a pressure difference between the inner chamber and the outer chamber, and is seated on one of the valve seat on the inlet side and the valve seat on the outlet side. hand, By selectively shutting off the inlet and the outlet, the flow direction of the drain is orthogonal to the valve operation, so that the influence of the water pressure of the drain on the valve operation can be minimized and the operation is more stable. It is possible to freely set the direction of the drain valve with respect to the drain pipe,
Excellent usability and high versatility.

Further, in any of the inventions, the structure is simple and the production can be performed at low cost, and the maintenance is excellent. In addition, since it operates automatically in response to changes in atmospheric pressure, running costs can be significantly reduced compared to the conventional type, where dedicated workers manually operated, and operation errors due to human operation are also reduced. It is not necessary to use a tank for maintaining airtightness, so that the weight does not increase and the piping structure does not need to be complicated. From such various characteristics, it is particularly suitable for implementation in high-speed railway vehicles such as bullet trains and magnetically levitated vehicles in which entering and exiting tunnels and passing by oncoming vehicles, etc., greatly change the pressure inside the vehicle. is there.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a drain valve showing a first embodiment of the present invention in a state where a valve body is located at a neutral position.

FIG. 2 is a sectional view of a drain valve showing a state in which an inflow port is closed by a valve body in FIG. 1;

FIG. 3 is a cross-sectional view of the drain valve showing a state in which an outlet is closed by the valve body of FIG. 1;

FIG. 4 is a sectional view of a drain valve according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drain valve 2 ... Drain piping 2a ... Upstream pipe of drain piping 2 2b ... Downstream pipe of drain piping 2c ... Relay short pipe 3 ... Valve box 3a ... Upper case of valve box 3 3b ... Lower of valve box 3 Case 3c ... Through hole 4 ... Inlet 5 ... Outlet 6 ... Lower cover 9 ... Diaphragm 9a ... Flexible membrane of diaphragm 9b ... Diaphragm plate of diaphragm 9 10 ... Communicating chamber 12 ... Valve body 13, 14 ... Valve seat 15 ... Coil spring 16 ... Car interior chamber 17 ... Car exterior chamber 18 ... Flexible partition membrane 20 ... Upper valve chamber 21 ... Lower valve chamber 30 ... Drain valve 31 ... Valve part 32 ... Diaphragm part 33 ... Valve box 33a ... Upper Case 33b Lower case 33c, 33d Connection tube 34 Diaphragm case 34a Case main body 34b Cover plate 35 Connection tube 36 Valve stem 37 Valve body 38 Diaphragm 38a Flexible membrane 38b, 38c Diaphragm plate 41 Inlet 42 Outlet 43 Valve seat at inlet 41 44 Valve seat at outlet 42 50 Inner chamber 51 Outer chamber 52a 52b: Ventilation pipe 57: Adjustment bolt 61, 62: Coil spring

Continuation of the front page (56) References Japanese Utility Model Sho 58-196484 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 7/00 B61D 27/00

Claims (2)

(57) [Claims] An inlet for drain introduction is provided at an upper part of a valve box disposed in a drain pipe, and an outlet for drain discharge is provided at a lower part thereof, and the valve box is connected to a diaphragm. The upper chamber and the lower outer chamber are divided into upper and lower inner chambers. The inner chamber is communicated with the interior of the vehicle body, and the outer chamber is communicated with the exterior of the vehicle. A flexible partition membrane covers the outer chamber between the inflow port and the outflow port to define an upper valve chamber and a lower valve chamber inside the partition membrane. between the chamber communicating with the through hole for drain outlet, to form the inlet and the outlet respectively the valve seat to the open end of the diaphragm, no pressure variation in the vehicle body and out
Normally, the drain is located between the inlet and the outlet.
Allows circulation, and when the diaphragm moves up and down due to a pressure difference between the inside and outside of the vehicle body, sits on one of the inlet and outlet valve seats in conjunction with the diaphragm, and selects the inlet and outlet. A drain valve for an air conditioner for a railway vehicle, wherein a valve body for temporarily shutting off is fixed . 2. A valve portion disposed in a drain pipe,
A diaphragm portion that opens and closes the valve portion, wherein the diaphragm portion is defined by a diaphragm as an inner chamber and an outer chamber.
A valve box having an interior chamber communicated with the interior of the vehicle body and an exterior chamber communicated with the exterior of the vehicle body, and the valve portion having an inlet for introducing a drain from an air conditioner and an outlet for discharging the drain to the exterior of the vehicle. the provided, provided with a respective valve seat between the inlet and the outlet of the internal valve box, before <br/> SL valve stem coupled to the diaphragm, pressure variations in the body and out
It is located between the inlet and the outlet during normal times when there is no movement
When the diaphragm swings due to the pressure difference between the inside and outside of the vehicle body ,
Te, seated on one of the valve seat of the inlet side and the outlet side, the valve body for selectively blocking the flow inlet and the outlet
A drain valve for a railway vehicle air conditioner, which is fixed .