JP5089472B2 - Water seal device - Google Patents

Description

  The present invention relates to a water-sealing device that is a hermetic chamber in which a pressure difference between an internal pressure and an external pressure fluctuates and discharges the drain generated in the hermetic chamber to the outside of the hermetic chamber, and in particular, It is related with the water sealing apparatus which can discharge | emit drain efficiently, maintaining a water vapor.

  In high-speed vehicles such as Shinkansen, sudden pressure fluctuations occur outside the passenger compartment when entering or exiting a tunnel or when passing by oncoming vehicles. If this pressure fluctuation affects the pressure in the interior of the vehicle interior, passengers feel uncomfortable, so the vehicle interior of the high-speed vehicle is an airtight chamber.

  However, high-speed vehicles generally include a drain pipe for discharging drain generated in the passenger compartment to the outside of the passenger compartment, and such pressure fluctuations may affect the pressure in the passenger compartment through the drain pipe. was there.

  Therefore, for example, in Patent Documents 1 and 2, a water seal device is provided in the drain pipe, and the drain that flows into the water seal device acts as seal water, thereby draining the drain while maintaining the airtightness of the interior of the vehicle interior. Techniques that can be used are disclosed.

Further, for example, in Patent Document 2, a drain valve is provided in a drain pipe, and the drain valve is opened and closed in accordance with a pressure difference between a pressure outside the vehicle compartment and a pressure inside the vehicle compartment, so A technique capable of discharging drain while maintaining the above is disclosed.
JP 2006-7899 A JP-A-9-79383 JP-A-8-291873

  However, the techniques disclosed in Patent Documents 1 and 2 have a problem that when the drain in the water sealing device is dried, the airtightness of the interior of the vehicle interior cannot be maintained. Further, in the technique disclosed in Patent Document 3, since the airtightness inside the vehicle compartment is broken immediately after the drain valve is opened, the drain valve is used only when the pressure difference between the pressure outside the vehicle compartment and the pressure inside the vehicle compartment is small. There was a problem that the opportunity to discharge drain was limited.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a water seal device that can efficiently discharge drain while keeping airtightness in an airtight chamber.

In order to achieve this object, the water sealing device according to claim 1 is an airtight chamber in which a pressure difference between an internal pressure and an external pressure varies, and drain generated in the airtight chamber is discharged to the outside of the airtight chamber. A first flow path communicating with the inside of the hermetic chamber; a second flow path communicating with the first flow path and communicating with the outside of the hermetic chamber; A first valve device provided between the first flow path and a second valve device provided between the first flow path and the second flow path, wherein the first valve device is disposed inside the hermetic chamber. A first valve chamber provided in communication with the drain, a liquid level detecting means for detecting a liquid level of the drain in the first valve chamber, and the first valve detected by the liquid level detecting means A first valve that shuts off the first flow path according to the liquid level of the drain in the chamber, When the drain liquid level in the first valve chamber detected by the means is lower than a predetermined height, the first valve blocks the first flow path, while the liquid level detection means detects the drain level. When the drain level in the first valve chamber is higher than the predetermined height, the first flow path is configured to communicate with the first flow path, and the second valve device is connected to the second flow path. A second valve chamber provided in communication, a second communication port formed in the second valve chamber and communicated with the first flow path, and the second communication port accommodated in the second valve chamber. A second valve element that operates by a pressure difference between the drain head pressure at the position and the pressure outside the hermetic chamber, and when the pressure outside the hermetic chamber is higher than the head pressure, the second valve The second communication port is closed by a body, and the first channel and the first channel While blocking the valve chamber, when the pressure in the hermetic chamber outside is lower than the water head pressure is configured so as to communicate with said first flow path and the second valve chamber, the second communication port Is located above the first flow path and provided on the bottom surface of the second valve chamber, and the second valve body floats on the liquid level of the drain that has flowed into the second valve chamber. The second valve device is configured to operate following the change in the drain liquid level in the valve chamber, and the drain valve liquid level in the second valve chamber is lower than the position of the second communication port. In this case, the second communication port is closed by the second valve body to block the first flow path and the second valve chamber, while the liquid level of the drain in the second valve chamber is the first level. When the position is higher than the position of the two communication ports, the first flow path and the second valve chamber are communicated with each other. ing.

  The water seal device according to claim 2 is the water seal device according to claim 1, wherein the liquid level detecting means is accommodated in the first valve chamber and flows into the first valve chamber. And a float that operates following the change in the liquid level of the drain in the first valve chamber, and is configured to detect the liquid level of the drain in the first valve chamber based on the operation of the float. The first valve is configured to block the first flow path in conjunction with the operation of the float.

  The water seal device according to claim 3 is the water seal device according to claim 1 or 2, wherein the first flow path is provided with an orifice for narrowing a cross-sectional area of the flow path.

The water seal device according to claim 4 is the water seal device according to any one of claims 1 to 3 , wherein a third communication port is formed in the second valve chamber and communicated with the second flow path. A gap forming means provided in the second valve chamber for forming a gap between the second valve body and the third communication port when the second valve body is close to the third communication port; Yes.

  According to the water seal device of the first aspect, the drain generated in the hermetic chamber first flows into the first valve chamber and then flows into the second valve chamber through the first flow path. And it is discharged | emitted outside an airtight chamber through a 2nd flow path.

  Here, according to the water sealing device of the present invention, the first valve device includes a liquid level detecting means for detecting the liquid level of the drain in the first valve chamber, and the first valve chamber detected by the liquid level detecting means. A first valve that shuts off the first flow path according to the drain liquid level in the case where the drain liquid level in the first valve chamber detected by the liquid level detection means is lower than a predetermined height, When the first flow path is blocked by the first valve and the drain liquid level in the first valve chamber detected by the liquid level detection means is higher than a predetermined height, the first flow path is communicated. Since it is comprised, a 1st flow path can be interrupted | blocked or connected according to the liquid level of the drain in a 1st valve chamber.

  Thus, when the drain level in the first valve chamber is lower than a predetermined height, that is, when there is no drain in the first valve chamber or when the drain in the first valve chamber is relatively small, the first By blocking the flow path, the inside of the airtight chamber can be kept airtight.

  On the other hand, if the drain level in the first valve chamber is higher than a predetermined height, that is, if the drain in the first valve chamber is relatively large, it is determined that there is a high need to discharge the drain to the outside of the hermetic chamber. Therefore, the drain can be discharged by communicating the first flow path. Further, in this case, even in a state where the first flow path is communicated, the drain existing in the first valve chamber and the first flow path is allowed to act as a sealing water to keep the air tightness in the airtight chamber. Can do.

  Furthermore, since the drain existing in the first valve chamber and the first flow path acts as sealing water, even if the pressure difference between the pressure outside the hermetic chamber and the pressure inside the hermetic chamber fluctuates rapidly, A sudden change in pressure can be prevented.

  According to the water seal device of the present invention, the second valve device is accommodated in the second valve chamber and operates by a pressure difference between the drain head pressure at the second communication port position and the pressure outside the hermetic chamber. A second valve body, and when the pressure outside the hermetic chamber is higher than the hydraulic head pressure, the second communication port is closed by the second valve body to shut off the first flow path and the second valve chamber. On the other hand, when the pressure outside the hermetic chamber is lower than the hydraulic head pressure, since the first flow path and the second valve chamber are configured to communicate with each other, the pressure outside the hermetic chamber and the second communication port position The first flow path and the second valve chamber can be shut off or communicated according to the pressure difference between the drain water head pressure and the drain.

  As a result, when the pressure outside the hermetic chamber is higher than the drain head pressure at the second communication port position, it is determined that there is a high need to maintain the airtightness in the hermetic chamber. By shutting off the valve chamber, the hermetic chamber can be kept airtight. Further, in this case, even in a state where there is no drain in the first valve chamber, it is possible to maintain the airtightness in the airtight chamber.

  On the other hand, when the pressure outside the hermetic chamber is lower than the water head pressure of the drain at the second communication port position, the drain can be discharged by communicating the first flow path and the second valve chamber. In this case, even if the first flow path and the second valve chamber are in communication with each other, the drain existing in the first flow path and the second valve chamber is caused to act as a sealing water, thereby The internal airtightness can be kept.

Thus, according to the present invention, the drain flow paths (first flow path, first flow path, and second valve chamber) according to the necessity of draining the drain and the necessity of maintaining the air tightness in the airtight chamber. Therefore, there is an effect that drain can be discharged efficiently.
The second communication port is located above the first flow path and provided on the bottom surface of the second valve chamber, and the second valve body floats on the liquid level of the drain that has flowed into the second valve chamber. The second valve device is configured to operate following a change in the drain liquid level in the valve chamber, and the second valve device is configured to operate when the drain liquid level in the second valve chamber is lower than the position of the second communication port. When the second communication port is closed by the two-valve body to block the first flow path and the second valve chamber, while the drain liquid level in the second valve chamber is higher than the position of the second communication port, Since the first flow path and the second valve chamber are configured to communicate with each other, the first flow path and the second valve chamber can be blocked or communicated according to the drain liquid level in the first valve chamber. it can.
Thereby, when the drain liquid level in the second valve chamber is lower than the position of the second communication port, that is, when there is no drain in the first valve chamber or when the drain in the first valve chamber is relatively small. By shutting off the first flow path and the second valve chamber, the airtight chamber can be kept airtight.
On the other hand, when the drain liquid level in the second valve chamber is higher than the position of the second communication port, that is, when the drain in the first valve chamber is relatively large, there is a need to discharge the drain to the outside of the hermetic chamber. Since it is determined to be high, the drain can be discharged by communicating the first flow path and the second valve chamber. In this case, even if the first flow path and the second valve chamber are in communication with each other, the drain existing in the first flow path and the second valve chamber is caused to act as a sealing water, thereby The internal airtightness can be kept.
As described above, according to the present invention, since the first flow path and the second valve chamber are shut off or communicated according to the necessity of discharging the drain, there is an effect that the drain can be discharged efficiently.
Further, according to the present invention, the drain level in the second valve chamber is not limited to the case where the pressure outside the hermetic chamber is higher than the water head pressure of the drain flowing into the first valve chamber. If it is lower, the second communication port is closed by the second valve body, so that the airtightness of the airtight chamber can be reliably maintained.

  According to the water sealing device of the second aspect, in addition to the effect produced by the water sealing device of the first aspect, the liquid level detection means is accommodated in the first valve chamber and the drain level flowing into the first valve chamber. A float that floats on the liquid surface and operates following the change in the drain level in the first valve chamber, and is configured to detect the drain level in the first valve chamber based on the operation of the float; Since the one valve is configured to block the first flow path in conjunction with the operation of the float, the first flow path is accurately blocked or communicated according to the drain liquid level in the first valve chamber. There is an effect that can be.

  According to the water sealing device of the third aspect, in addition to the effect produced by the water sealing device according to the first or second aspect, the first flow path is provided with an orifice for reducing the cross-sectional area of the flow path. The flow rate can be suppressed. Thereby, even when the flow rate of the drain is fast, there is an effect that the airtightness in the airtight chamber can be reliably maintained.

  That is, when the drain flow rate is high, the timing for closing the first flow path by the first valve and the timing for closing the second communication port by the second valve body are delayed, and the airtightness in the airtight chamber is broken. There is a fear. On the other hand, according to the present invention, since the flow rate of the drain can be suppressed, the delay of the timing for closing the first flow path by the first valve or the timing for closing the second communication port by the second valve body is achieved. The delay can be prevented and the airtightness in the airtight chamber can be reliably maintained.

According to the water seal device according to claim 4, in addition to the effects of the water seal device according to any one of claims 1 to 3, the third to be communicated with the second flow path is opened and formed in the second valve chamber A communication port and a gap forming means provided in the second valve chamber and forming a gap between the second valve body and the third communication port when the second valve body is close to the third communication port are provided. Therefore, there is an effect that the second valve body is prevented from sticking to the third communication port, and the drain can be discharged reliably.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of the Shinkansen 1 in which the water sealing device 100 according to the first embodiment of the present invention is used. In addition, in FIG. 1, the water sealing apparatus 100 is shown typically.

  First, a schematic configuration of the Shinkansen 1 will be described. The Shinkansen 1 is a high-speed vehicle that travels at high speed on a rail R laid on the ground. As shown in FIG. 1, a vehicle body 2 that forms a vehicle compartment (not shown) as an airtight chamber, and the vehicle body 2 And a water sealing device 100 disposed under the floor of the vehicle, and configured to allow drainage generated in the interior of the vehicle interior to be discharged to the outside of the vehicle interior by the water sealing device 100 while maintaining airtightness in the interior of the vehicle interior. Has been.

  In the present embodiment, the case where drainage generated in an air conditioner (not shown) is discharged to the outside of the passenger compartment by the water seal device 100 is described. However, the present invention is not necessarily limited to this. The drain generated by (not shown) or the like may be discharged to the outside of the passenger compartment by the water sealing device 100.

  Next, a schematic configuration of the water sealing device 100 will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the internal structure of the water sealing device 100. As shown in FIG. 2, the water seal device 100 is connected to the drain pipe 10 of the air conditioner, and communicates with the interior of the vehicle interior via the drain pipe 10, and the first flow path 101. Is connected to the outside of the passenger compartment, the first valve device 110 provided between the drain pipe 10 and the first flow path 101, the first flow path 101 and the second flow path. A second valve device 140 provided between the passage 105 and the passage 105 is provided.

  According to the water seal device 100, the drain generated in the air conditioner first flows into the first valve device 110 and then flows into the second valve device 140 through the first flow path 101. Then, it is discharged to the outside of the passenger compartment through the second flow path 105.

  Next, a detailed configuration of the first valve device 110 will be described with reference to FIG. The first valve device 110 is for blocking or communicating between the interior of the vehicle interior and the first flow path 101. As shown in FIG. 2, the first valve device 110 is connected to the drain pipe 10 (interior of the vehicle interior) and the first flow path 101. The first valve chamber 120 provided in communication with the first valve body 130 accommodated in the first valve chamber 120 is provided.

  As shown in FIG. 2, the first valve chamber 120 is configured in a container shape having an internal space, and the internal space is positioned below the upper layer portion 120 a and the upper layer portion 120 a (lower side in FIG. 2). It is divided into a lower layer part 120b. The upper layer portion 120a and the lower layer portion 120b are configured such that the volume of the upper layer portion 120a is larger than the volume of the lower layer portion 120b, and the horizontal sectional area of the lower layer portion 120b is smaller than the horizontal sectional area of the upper layer portion 120a. The lower layer portion 120b is configured to accommodate the first valve body 130, and is formed in a shape in which an outer peripheral surface of a later-described valve portion 132 is inscribed.

  As shown in FIG. 2, a first communication port 121 is formed in the lower layer portion 120b. The first communication port 121 is an opening that communicates with the first flow path 101, is provided on a side surface of the first valve chamber 120, and a position where the height from the bottom surface S of the first valve chamber 120 is the dimension A. Is arranged.

  As shown in FIG. 2, a partition plate 122 is disposed in the first valve chamber 120. The partition plate 122 is for restricting the highest position of the operation of the first valve element 130, and also serves to restrict the operation of the first valve element 130 in the lateral direction (left-right direction in FIG. 2).

  The first valve body 130 operates following the change in the drain liquid level (the height from the bottom surface S of the first valve chamber 120) in the first valve chamber 120, and the first communication port 121 is accompanied by the operation. As shown in FIG. 2, it is configured to include a float part 131 and a valve part 132 connected to the float part 131.

  Here, with reference to FIG. 3, the detailed structure of the 1st valve body 130 is demonstrated. Fig.3 (a) is a top view of the 1st valve body 130, FIG.3 (b) is sectional drawing of the 1st valve body 130 in the IIIb-IIIb line | wire of Fig.3 (a).

  The float 131 is configured as a float that floats on the liquid level of the drain that has flowed into the first valve chamber 120, and is formed in a cylindrical shape as shown in FIG. On the other hand, the valve part 132 is configured as a valve for opening and closing the first communication port 121 (see FIG. 2), and is formed in a cylindrical shape surrounding the outer periphery of the float part 131 as shown in FIG.

  As shown in FIG. 3B, an overhang portion 133 is formed on the inner peripheral surface of the valve portion 132. The overhang portion 133 is a portion that connects the float portion 131 and the valve portion 132, and is formed so as to protrude in a direction that intersects the operation direction of the first valve body 130 (the vertical direction in FIG. 3B). At the same time, below the water line L of the float part 131 (the boundary line between the part that sinks below the liquid level and the part that floats above the liquid level when the float part 131 floats on the drain surface) (lower part of FIG. 3B) Side). In a state where the float part 131 and the valve part 132 are connected by the overhang part 133, the first valve body 130 is set so that the height from the lower end of the valve part 132 to the draft line L is the dimension B. Yes.

  As shown in FIG. 3, four through holes 134 are formed in the overhang portion 133. The through-holes 134 are for reducing the flow passage cross-sectional area of the drain, and are arranged at substantially equal intervals (90 ° intervals) in the circumferential direction in a top view.

  Returning to FIG. According to the 1st valve apparatus 110 comprised as mentioned above, when the liquid level of the drain in the 1st valve chamber 120 is lower than the height X which added the dimension B (refer FIG. 3) to the dimension A mentioned above. The first communication port 121 is closed by the first valve body 130 (valve portion 132), and the first valve chamber 120 and the first flow path 101 are shut off. On the other hand, when the drain level in the first valve chamber 120 is higher than the height X, the first communication port 121 is opened, and the first valve chamber 120 and the first flow path 101 are communicated. Thereby, according to the liquid level of the drain in the 1st valve chamber 120, the 1st valve chamber 120 and the 1st flow path 101 can be interrupted | blocked or connected.

  Here, since the first valve chamber 120 is configured such that the horizontal sectional area of the lower layer portion 120b is smaller than the horizontal sectional area of the upper layer portion 120a, the drain level in the lower layer portion 120b is the liquid level of the drain in the upper layer portion 120a. The first valve body 130 is easy to operate in the lower layer portion 120b. In this regard, since the first communication port 121 is provided in the lower layer portion 120b, the first communication port 121 can be opened and closed sensitively. Thereby, drain can be discharged efficiently.

  On the other hand, since the volume of the upper layer part 120a is configured to be larger than the volume of the lower layer part 120b, a buffer region (storage space) for temporarily storing the drain can be secured. Thereby, the backflow of the drain to the vehicle interior part can be suppressed.

  Moreover, since the 1st communicating port 121 is provided in the side surface of the 1st valve chamber 120, the direction from which the hydraulic head pressure of a drain and the pressure in a vehicle interior differ from the operation direction of the 1st valve body 130 (direction to cross | intersect). Can be acted upon. Thereby, it is possible to prevent the first valve body 130 from adhering to the first communication port 121 and to drain the drain reliably.

  In addition, the first valve body 130 includes an overhang portion 133 that protrudes in a direction intersecting with the operation direction, and the overhang portion 133 is located below the draft line L. 133 sinks below the drain surface and becomes resistant to the drain flow. Therefore, when the flow rate of the drain is fast, the first valve body 130 can be operated quickly using the momentum of the flow. Furthermore, since the overhang | projection part 133 is comprised so that the flow-path cross-sectional area of a drain may be restrict | squeezed, the flow rate of a drain can be suppressed. Thereby, even when the flow rate of the drain is high, the airtightness of the interior of the vehicle interior can be reliably maintained.

  Further, since the first valve chamber 120 is provided with a partition plate 122 that restricts the highest position of the operation of the first valve body 130, the first valve body 130 is restricted from rising and the first communication port 121 is restricted. Can be opened and closed quickly. Thereby, the airtightness of the vehicle interior can be reliably maintained.

  Next, the detailed configuration of the second valve device 140 will be described with reference to FIG. The 2nd valve apparatus 140 is for interrupting | blocking or connecting the 1st flow path 101 and the exterior of a vehicle interior, and as shown in FIG. 2, the 1st flow path 101 and the 2nd flow path 105 (vehicle interior exterior) ) And a second valve body 160 accommodated in the second valve chamber 150.

  As shown in FIG. 2, the second valve chamber 150 is formed in a container shape having an internal space, and a second communication port 151 is formed in the bottom surface thereof. The second communication port 151 is an opening that communicates with the first flow path 101, is located above the first communication port 121 (upper side in FIG. 2), and has a height from the bottom surface S of the first valve chamber 120. Is arranged at a position where the dimension C becomes. In the present embodiment, the dimension C is set larger than the value obtained by adding the dimension B to the dimension A described above.

  As shown in FIG. 2, a third communication port 152 is formed in the side surface of the second valve chamber 150. The third communication port 152 is an opening that communicates with the second flow path 105, is located above the second communication port 151 (upper side in FIG. 2), and has a height from the bottom surface S of the first valve chamber 120. Is arranged at a position where the dimension D becomes. That is, in the present embodiment, the dimension D is set larger than the value of the dimension C described above.

  As shown in FIG. 2, an annular groove 153 is formed in the second valve chamber 150. The annular groove 153 is for forming a gap between the second valve body 160 and the third communication port 152 when the second valve body 160 is close to the third communication port 152. The second valve chamber 150 is annularly recessed along the inner peripheral surface of the second valve chamber 150.

  The second valve body 160 operates following the change in the drain liquid level in the second valve chamber 150, and opens and closes the second communication port 151 in accordance with the operation, and flows into the second valve chamber 150. It is configured as a float that floats on the liquid surface of the drain, and is formed in a spherical shape as shown in FIG.

  According to the second valve device 140 configured as described above, there is no pressure difference between the pressure outside the vehicle compartment and the pressure inside the vehicle compartment, and the drain liquid level in the first valve chamber 120 has the dimension C described above. When the height Y is lower than the equal height Y, the second valve body 160 is urged toward the second communication port 151 by gravity, whereby the second communication port 151 is closed by the second valve body 160, and the first The flow path 101 and the second valve chamber 150 are blocked. On the other hand, when the liquid level of the drain in the first valve chamber 120 is higher than the height Y, the second valve body 160 is operated by the water head pressure of the drain, so that the second communication port 151 is opened, and the first The flow path 101 and the second valve chamber 150 communicate with each other. Accordingly, the first flow path 101 and the second valve chamber 150 can be shut off or communicated according to the drain liquid level in the first valve chamber 120.

  Further, when the pressure outside the vehicle compartment is higher than the drain head pressure, the second valve body 160 is urged toward the second communication port 151 by the pressure outside the vehicle compartment, so that the second valve body 160 is urged. As a result, the second communication port 151 is closed, and the first flow path 101 and the second valve chamber 150 are shut off. On the other hand, when the pressure outside the passenger compartment is lower than the drain head pressure, the second valve body 160 is operated by the drain head pressure, so that the second communication port 151 is opened and the first flow path 101 is connected. The second valve chamber 150 communicates with the second valve chamber 150. Thereby, the 1st flow path 101 and the 2nd valve chamber 150 can be interrupted | blocked or connected according to the pressure difference of the pressure outside a vehicle compartment, and the water head pressure of a drain.

  Here, in the second valve chamber 150, an annular groove 153 that forms a gap between the second valve body 160 and the third communication port 152 when the second valve body 160 is close to the third communication port 152. Therefore, the second valve body 160 can be prevented from adhering to the third communication port 152, and the drain can be discharged reliably.

  Next, a detailed configuration of the first flow path 101 will be described with reference to FIG. As shown in FIG. 2, an orifice 102 is formed in the first channel 101 to reduce the channel cross-sectional area of the drain. Thereby, the flow rate of the drain can be suppressed, and even when the flow rate of the drain is high, the airtightness of the interior of the vehicle interior can be reliably maintained.

  Next, referring to FIG. 4, the state transition of the water sealing device 100 and the action of each state will be described. FIG. 4 is an explanatory diagram for explaining the state of the water sealing device 100, where (a) shows the first state, (b) shows the second state, (c) shows the third state, and (d) shows the first state. 4 states and (e) show the 5th state, respectively. In FIG. 4, only the main components are denoted by reference numerals for easy understanding of the drawing.

  First, the first state will be described with reference to FIG. The first state is, for example, a state when the air conditioner is in the heating operation or when the Shinkansen 1 that has been suspended for a long time resumes operation. In this state, since the drain in the water seal device 100 is dry and the drain liquid level in the first valve chamber 120 is lower than the height X, the first communication port 121 is closed by the first valve body 130. The first valve chamber 120 and the first flow path 101 are shut off. Further, since the drain liquid level in the first valve chamber 120 is lower than the height X, the second communication port 151 is closed by the second valve body 160 and the first flow path 101 and the second valve chamber 150 are blocked. Is done. Thereby, the airtightness of the vehicle interior is maintained.

  Here, even when the pressure outside the vehicle compartment is lower than the pressure inside the vehicle compartment in the first state, the first communication port 121 is closed by the first valve body 130, and the first valve chamber 120 and the first flow Since the road 101 is cut off, airtightness in the interior of the vehicle interior is maintained.

  Even when the pressure outside the vehicle compartment is higher than the pressure inside the vehicle compartment in the first state, the second communication port 151 is closed by the second valve body 160, and the first flow path 101 and the second valve chamber are closed. Since 150 is cut off, airtightness in the interior of the vehicle interior is maintained.

  In addition, even when drain is generated in the air conditioner from the first state shown in FIG. 4A, until the drain liquid level in the first valve chamber 120 becomes higher than the height X, Similarly, the first communication port 121 is closed by the first valve body 130, the first valve chamber 120 and the first flow path 101 are blocked, and the second communication port 151 is closed by the second valve body 160. The first flow path 101 and the second valve chamber 150 are shut off. Thereby, the airtightness of the vehicle interior is maintained.

  In this state, even when the pressure outside the vehicle compartment becomes lower than the pressure inside the vehicle compartment, the first communication port 121 is closed by the first valve body 130, and the first valve chamber 120 and the first flow path 101 are connected. Since it is shut off, the inside of the passenger compartment is kept airtight.

  In this state, even when the pressure outside the vehicle compartment is higher than the pressure inside the vehicle compartment, the second communication port 151 is closed by the second valve body 160, and the first flow path 101 and the second valve chamber 150 are closed. And the airtightness inside the passenger compartment is maintained.

  Next, the second state will be described with reference to FIG. In the second state, drainage is generated in the air conditioner from the first state shown in FIG. 4A, and the drain liquid level in the first valve chamber 120 is higher than the height X and lower than the height Y. State. In this state, since the drain level in the first valve chamber 120 is higher than the height X, the first communication port 121 is opened, and the first valve chamber 120 and the first flow path 101 are communicated. However, even if the first valve chamber 120 and the first flow path 101 are in communication with each other, the drain present in the first valve chamber 120 and the first flow path 101 acts as sealing water. On the other hand, since the liquid level of the drain in the first valve chamber 120 is lower than the height Y, the second communication port 151 is closed by the second valve body 160 and the first flow path 101 and the second valve chamber 150 are shut off. Is done. Thereby, the airtightness of the vehicle interior is maintained.

  Here, even when the pressure outside the vehicle compartment is higher than the pressure inside the vehicle compartment in the second state, the second communication port 151 is closed by the second valve body 160, and the first flow path 101 and the second valve are closed. Since the chamber 150 is shut off, the inside of the passenger compartment is kept airtight.

  Next, the third state will be described with reference to FIG. The third state is a state in which the pressure outside the vehicle compartment is lower than the pressure inside the vehicle compartment in the second state shown in FIG. In this state, the drain liquid level in the first valve chamber 120 is pushed down by the pressure in the vehicle interior, and the drain liquid level in the first valve chamber 120 becomes lower than the height X. The first communication port 121 is closed, and the first valve chamber 120 and the first flow path 101 are shut off. Thereby, the airtightness of the vehicle interior is maintained.

  Next, the fourth state will be described with reference to FIG. The fourth state is a state where drainage is continuously generated in the air conditioner from the second state shown in FIG. 4B, and the drain liquid level in the first valve chamber 120 is higher than the height Y. In this state, since the drain level in the first valve chamber 120 is higher than the height X, the first communication port 121 is opened, and the first valve chamber 120 and the first flow path 101 are communicated. Further, since the drain liquid level in the first valve chamber 120 is higher than the height Y, the second communication port 151 is opened, and the first flow path 101 and the second valve chamber 150 are communicated. Accordingly, when the drain level in the first valve chamber 120 is higher than the height Z equal to the dimension D described above, the drain is discharged to the outside of the vehicle compartment through the second flow path 105.

  However, even if the first valve chamber 120 and the first flow path 101 are in communication with each other, the drain present in the first valve chamber 120 and the first flow path 101 acts as sealing water. Further, even when the first flow path 101 and the second valve chamber 150 are in communication with each other, the drain existing in the first flow path 101 and the second valve chamber 150 acts as sealing water. Thereby, the airtightness of the vehicle interior is maintained.

  In addition, if drain is discharged | emitted from the 4th state shown in FIG.4 (d) and the liquid level of the drain in the 1st valve chamber 120 becomes low, it will be in the 3rd state shown in FIG.4 (c). Therefore, as in the case of the third state, the first communication port 121 is closed by the first valve body 130 and the first valve chamber 120 and the first flow path 101 are blocked. Thereby, the airtightness of the vehicle interior is maintained.

  Further, even when the pressure outside the passenger compartment becomes higher than the pressure inside the passenger compartment in the fourth state, the same as in the fourth state until the pressure outside the passenger compartment becomes higher than the head pressure of the drain. The first communication port 121 is opened, the first valve chamber 120 and the first flow path 101 are communicated, and the second communication port 151 is opened, so that the first flow path 101 and the second valve chamber 150 are connected. Communicated. Thereby, when the liquid level of the drain in the first valve chamber 120 is higher than the height Z, the drain is discharged to the outside of the vehicle compartment through the second flow path 105.

  However, as in the case of the fourth state, even if the first valve chamber 120 and the first flow path 101 are in communication with each other, the drain existing in the first valve chamber 120 and the first flow path 101 is present. Acts as a sealing water. Further, even when the first flow path 101 and the second valve chamber 150 are in communication with each other, the drain existing in the first flow path 101 and the second valve chamber 150 acts as sealing water. Thereby, the airtightness of the vehicle interior is maintained.

  Next, the fifth state will be described with reference to FIG. The fifth state is a state in which the pressure outside the vehicle compartment is higher than the pressure inside the vehicle compartment and the pressure outside the vehicle compartment is higher than the water head pressure of the drain in the fourth state shown in FIG. . In this state, the second communication port 151 is closed by the second valve body 160 and the first flow path 101 and the second valve chamber 150 are blocked. Thereby, the airtightness of the vehicle interior is maintained.

  As described above, according to the water sealing device 100 in the present embodiment, when the drain liquid level in the first valve chamber 120 is lower than the height X, that is, there is drain in the first valve chamber 120. If not, or if the drain in the first valve chamber 120 is relatively small, the first valve chamber 120 and the first flow path 101 are blocked and the first flow path 101 and the second valve chamber 150 are blocked. As a result, the inside of the passenger compartment can be kept airtight.

  On the other hand, when the drain level in the first valve chamber 120 is higher than the height X, that is, when the drain in the first valve chamber 120 is relatively large, it is determined that there is a high need for drainage. Therefore, the drain can be discharged by communicating the first valve chamber 120 and the first flow path 101 and communicating the first flow path 101 and the second valve chamber 150. In this case, even if the first valve chamber 120 and the first flow path 101 are in communication with each other, the drain existing in the first valve chamber 120 and the first flow path 101 acts as a sealing water. Thus, the airtightness in the airtight chamber can be maintained. Similarly, even when the first flow path 101 and the second valve chamber 150 are in communication with each other, the drains present in the first flow path 101 and the second valve chamber 150 act as sealed water, The airtightness inside the closed room can be maintained.

  Furthermore, since the drain existing in the first valve chamber 120 and the first flow path 101 acts as a sealing water, even when the pressure difference between the pressure outside the vehicle compartment and the pressure inside the vehicle compartment fluctuates rapidly, A sudden change in the pressure inside the passenger compartment can be prevented.

  Further, according to the water seal device 100 in the present embodiment, when the pressure outside the vehicle compartment is higher than the water head pressure of the drain, it is determined that there is a high need to keep the inside of the vehicle interior airtight. By shutting off the first flow path 101 and the second valve chamber 150, the inside of the vehicle compartment can be kept airtight. Further, in this case, even in a state where there is no drain in the first valve chamber 120, the airtightness of the interior of the vehicle interior can be maintained.

  On the other hand, when the pressure outside the vehicle compartment is lower than the water head pressure of the drain, the drain can be discharged by communicating the first flow path 101 and the second valve chamber 150. In this case, even if the first flow path 101 and the second valve chamber 150 are in communication with each other, the drain existing in the first flow path 101 and the second valve chamber 150 acts as sealing water. Thus, the airtightness in the airtight chamber can be maintained.

  As described above, according to the water seal device 100 in the present embodiment, the drain flow path (the first valve chamber 120 and the first valve) is selected according to the necessity of draining the drain and the necessity of keeping the airtightness in the vehicle interior. Since the flow path 101, the first flow path 101 and the second valve chamber 150) are blocked or communicated, the drain can be discharged efficiently. Further, even in a state where there is no drain in the first valve chamber 120, the inside of the vehicle interior can be kept airtight.

  Next, with reference to FIG. 5, a water seal device 200 in the second embodiment will be described. FIG. 5 is a cross-sectional view showing the internal structure of the water sealing device 200 according to the second embodiment. In the present embodiment, a case where the water sealing device 200 is used for the Shinkansen 1 will be described. Moreover, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The second valve body 160 in the first embodiment operates so as to follow the change in the drain liquid level in the second valve chamber 150, and is configured to open and close the second communication port 151 in accordance with the operation. However, the second valve body 260 in the second embodiment is configured to operate by the water head pressure of the drain, and is configured to open and close the second communication port 151 in accordance with the operation.

  As shown in FIG. 5, the second valve device 240 in the second embodiment includes a second valve chamber 250 provided in communication with the first flow path 101 and the second flow path 105 (outside the vehicle compartment), and The second valve body 260 is accommodated in the second valve chamber 250.

  As shown in FIG. 5, the second valve chamber 250 is configured in a container shape having an internal space, and a second communication port 151 is formed on one side (left side in FIG. 5) and the other ( A third communication port 152 is formed in the side surface on the right side of FIG.

  The second valve body 260 is operated by the water head pressure of the drain, and opens and closes the second communication port 151 in accordance with the operation, and is connected to the valve member 261 and the valve member 261 as shown in FIG. And an urging member 262 to be configured.

  The valve member 261 is configured as a valve for opening and closing the second communication port 151, and is urged toward the second communication port 151 side (left side in FIG. 5) by the urging member 262, as shown in FIG. The urging member 262 is configured by an elastic member (in this embodiment, a coil spring), and its elastic force is higher than the drain head pressure when the drain liquid level in the first valve chamber 120 is higher than the height X. It is small and is set to be higher than the drain head pressure when the drain liquid level in the first valve chamber 120 is lower than the height X.

  According to the second valve device 240 configured as described above, there is no pressure difference between the pressure outside the vehicle compartment and the pressure inside the vehicle compartment, and the drain liquid level in the first valve chamber 120 is higher than the height X. When it is low, the valve member 261 is urged toward the second communication port 151 by the elastic member 262, whereby the second communication port 151 is closed by the second valve body 260, and the first flow path 101 and the second flow channel The valve chamber 250 is shut off. On the other hand, when the drain liquid level in the first valve chamber 120 is higher than the height X, the valve member 261 operates against the urging force of the urging member 262 by the water head pressure of the drain. The communication port 151 is opened, and the first flow path 101 and the second valve chamber 250 are communicated. Accordingly, the first flow path 101 and the second valve chamber 250 can be shut off or communicated according to the drain liquid level in the first valve chamber 120.

  Further, when the pressure outside the vehicle compartment is higher than the drain head pressure, the valve member 261 is biased toward the second communication port 151 by the pressure outside the vehicle compartment, so that the second valve body 260 can The two communication ports 151 are closed, and the first flow path 101 and the second valve chamber 250 are blocked. On the other hand, when the pressure outside the passenger compartment is lower than the drain head pressure, the valve member 261 is operated by the drain head pressure, whereby the second communication port 151 is opened, and the first flow path 101 and the second passage The valve chamber 250 communicates with the valve chamber 250. Thereby, the 1st flow path 101 and the 2nd valve chamber 250 can be interrupted | blocked or connected according to the pressure difference of the pressure outside a vehicle compartment, and the water head pressure of a drain.

  As described above, according to the water sealing device 200 in the present embodiment, when the pressure outside the vehicle compartment is higher than the water head pressure of the drain, it is determined that there is a high need to maintain the airtightness inside the vehicle compartment. Therefore, by shutting off the first flow path 101 and the second valve chamber 250, it is possible to keep the inside of the vehicle interior airtight. Further, in this case, even in a state where there is no drain in the first valve chamber 120, the airtightness of the interior of the vehicle interior can be maintained.

  On the other hand, when the pressure outside the vehicle compartment is lower than the water head pressure of the drain, the drain can be discharged by communicating the first flow path 101 and the second valve chamber 250. In this case, even if the first flow path 101 and the second valve chamber 250 are in communication with each other, the drain existing in the first flow path 101 and the second valve chamber 250 acts as sealing water. Thus, the airtightness in the airtight chamber can be maintained.

  Thus, according to the water sealing device 200 in the present embodiment, as in the case of the water sealing device 100 in the first embodiment, it is necessary to discharge drain and to maintain airtightness in the vehicle interior. Accordingly, the drain flow path (the first flow path 101 and the second valve chamber 250) is blocked or communicated, and the drain can be discharged efficiently.

  Next, with reference to FIG. 6, a water seal device 300 according to the third embodiment will be described. FIG. 6 is a cross-sectional view showing the internal structure of the water sealing device 300 according to the third embodiment. In the present embodiment, a case where the water sealing device 300 is used for the Shinkansen 1 will be described. Moreover, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The first valve body 130 in the first embodiment operates so as to follow the change in the drain liquid level in the first valve chamber 120, and is configured to open and close the first communication port 121 in accordance with the operation. However, the first valve 330 in the third embodiment is configured to block or communicate the first flow path 101 in accordance with the drain liquid level in the first valve chamber 120 detected by the float 370. .

  As shown in FIG. 6, the first valve device 310 in the third embodiment is arranged in the first valve chamber 120, the float 370 accommodated in the first valve chamber 120, and the first flow path 101. The first valve 330 is provided mainly.

  The float 370 operates following the change in the drain liquid level in the first valve chamber 120, and detects the drain liquid level in the first valve chamber 120 in accordance with the operation. When the drain level in the first valve chamber 120 is lower than the height X, the switch 380 is turned off while the drain level in the first valve chamber 120 is turned off. When the drain liquid level is higher than the height X, the switch 380 is turned on.

  The first valve 330 blocks or communicates the first flow path 101 according to the drain liquid level in the first valve chamber 120 detected by the float 370, and is constituted by an electromagnetic valve, as shown in FIG. In addition, the first flow path 101 is blocked when the switch 380 is turned on, while the first flow path 101 is communicated when the switch 380 is turned off. It is configured. That is, in the present embodiment, the first valve 330 is configured to block or communicate the first flow path 101 in conjunction with the operation of the float 370.

  According to the first valve device 310 configured as described above, when the drain liquid level in the first valve chamber 120 is lower than the height X, the switch 380 is turned off and the first flow path 101 is shut off. Is done. On the other hand, when the drain liquid level in the first valve chamber 120 is higher than the height X, the switch 380 is turned on and the first flow path 101 is communicated. As a result, the first flow path 101 can be blocked or communicated according to the liquid level of the drain in the first valve chamber 120.

  As described above, according to the water sealing device 300 in the present embodiment, when the drain liquid level in the first valve chamber 120 is lower than the height X, that is, there is drain in the first valve chamber 120. If not, or if the drain in the first valve chamber 120 is relatively small, the interior of the vehicle compartment can be kept airtight by blocking the first flow path 101.

  On the other hand, when the drain level in the first valve chamber 120 is higher than the height X, that is, when the drain in the first valve chamber 120 is relatively large, it is determined that there is a high need for drainage. Therefore, the drain can be discharged by communicating the first flow path 101. Further, in this case, even in a state where the first flow path 101 is communicated, the drain existing in the first valve chamber 120 and the first flow path 101 is caused to act as sealing water, Can keep airtight.

  Thus, according to the water sealing device 300 in the present embodiment, as in the case of the water sealing device 100 in the first embodiment, it is necessary to discharge drain and to maintain airtightness in the vehicle interior. Accordingly, the drain channel (first channel 101) can be blocked or communicated, and the drain can be discharged efficiently.

  Next, with reference to FIG. 7, a water sealing device 400 in the fourth embodiment will be described. FIG. 7 is a cross-sectional view showing the internal structure of the water sealing device 400 according to the fourth embodiment. In the present embodiment, a case where the water sealing device 400 is used for the Shinkansen 1 will be described. Moreover, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7, the first valve device 410 in the fourth embodiment includes a first valve chamber 420 provided in communication with the drain pipe 10 (inside the vehicle compartment) and the first flow path 101, and the first valve chamber 420. And a first valve body 430 accommodated in the valve chamber 420.

  As shown in FIG. 7, the first valve chamber 420 is configured in a container shape having an internal space, and a first communication port 121 is formed in the bottom surface thereof. Further, as shown in FIG. 7, a partition plate 122 is disposed in the first valve chamber 420.

  The first valve body 430 operates following the change in the drain liquid level in the first valve chamber 420, and opens and closes the first communication port 121 in accordance with the operation, as shown in FIG. A floating part 431 and a valve part 432 connected to the lower side (lower side in FIG. 7) of the floating part 431 are provided.

  The float part 431 is configured as a float that floats on the liquid level of the drain that has flowed into the first valve chamber 420, and is formed in a cylindrical shape. On the other hand, the valve part 432 is configured as a valve for opening and closing the first communication port 121 and is formed in a spherical shape.

  As shown in FIG. 7, a resistance portion 433 is formed on the lower surface of the valve portion 432. The resistance portion 433 is a portion that sinks below the drain surface and becomes a resistance against the flow of the drain, and is formed in a so-called teardrop shape in which the cone and the hemisphere are combined so that their planes face each other. At the same time, it is configured to be located in the first flow channel 101 so as to reduce the flow channel cross-sectional area of the drain.

  According to the 1st valve apparatus 410 comprised as mentioned above, since the 1st valve body 430 is equipped with the resistance part 433 which becomes resistance with respect to the flow of drain, when the flow velocity of drain is high, The first valve body 430 can be quickly operated using the momentum of the flow. Furthermore, since the resistance portion 433 is configured to reduce the flow passage cross-sectional area of the drain, the flow rate of the drain can be suppressed. As a result, even when the drain flow rate is high, it is possible to prevent a delay in the timing of closing the first communication port 121 and improve the function of preventing the drain from flowing out from the first valve chamber 420. As a result, the airtightness of the interior of the vehicle interior can be reliably maintained.

  Further, since the resistance portion 433 is formed in a teardrop shape, resistance to the drain flow flowing out from the first valve chamber 420 through the first communication port 121 is transferred to the first valve chamber 420 through the first communication port 121. It can be greater than the resistance to the incoming drain flow.

  Here, with reference to FIG. 8, the operation of the resistance portion 433 will be described. 8A and 8B are explanatory views for explaining the action of the resistance portion 433. FIG. 8A shows the action when the drain flows out from the first valve chamber 420 through the first communication port 121, and FIG. 8B shows the action when the drain is the first. The operation when flowing into the first valve chamber 420 through the communication port 121 is shown. In addition, the arrow of FIG. 8 has shown the flow of the drain typically.

  When the drain flows out from the first valve chamber 420 through the first communication port 121, that is, when the drain flows from the conical side to the hemispherical side in the resistance portion 433, a frictional resistance is generated on the surface of the conical flow. Resistance. Further, as shown in FIG. 8 (a), on the surface of the hemisphere, the flow is separated from the surface and turbulent flow is generated below the resistance portion 433, so that resistance to the flow occurs.

  On the other hand, when the drain flows into the first valve chamber 420 through the first communication port 121, that is, when the drain flows from the hemispherical side toward the conical side in the resistance portion 433, friction resistance is generated on the surface of the resistance portion 433. Although it is unavoidable to occur, since the flow velocity is slowly decelerated, separation of the flow hardly occurs as shown in FIG. 8B, and the drain does not easily become resistance to the flow because the drain flows away smoothly.

  Therefore, the resistance to the flow of drain flowing out from the first valve chamber 420 through the first communication port 121 can be made larger than the resistance to the flow of drain flowing into the first valve chamber 420 through the first communication port 121. As a result, even when the drain flow rate is high, it is possible to prevent a delay in the timing of closing the first communication port 121 and improve the function of preventing the drain from flowing out from the first valve chamber 420. As a result, the airtightness of the interior of the vehicle interior can be reliably maintained.

  Returning to FIG. The second valve device 440 according to the fourth embodiment includes a second valve chamber 150 and a second valve body 460 accommodated in the second valve chamber 150. The second valve body 460 operates following the change in the drain liquid level in the second valve chamber 150, and opens and closes the second communication port 151 in accordance with the operation, and flows into the second valve chamber 150. It is configured as a float that floats on the liquid surface of the drain, and is formed in a spherical shape.

  As shown in FIG. 7, a resistance portion 463 is formed on the lower surface of the second valve body 460. The resistance portion 463 is a portion that sinks below the drain surface and becomes a resistance against the flow of the drain. The resistance portion 463 is formed in a teardrop shape and is located in the first flow channel 101 and is located in the first flow channel 101. It is configured to reduce the area.

  According to the 2nd valve apparatus 440 comprised as mentioned above, since the 2nd valve body 460 is provided with the resistance part 463 used as resistance with respect to the flow of drain, the flow velocity of the drain which flows back into the vehicle interior part Is fast, the second valve body 460 can be operated quickly using the momentum of the flow. Furthermore, since the resistance portion 463 is configured to reduce the flow path cross-sectional area of the first flow path 101, it is possible to suppress the flow rate of the drain that flows back into the vehicle interior. As a result, even when the flow rate of the drain that flows backward into the vehicle interior is high, the delay in timing for closing the second communication port 151 is prevented, and the function of preventing the drain outflow from the second valve chamber 150 is improved. Can be planned. As a result, the backflow of drain into the vehicle interior can be suppressed.

  In addition, since the resistance portion 463 is formed in a teardrop shape, resistance to the flow of drain flowing out from the second valve chamber 150 through the second communication port 151, and resistance to the second valve chamber 150 through the second communication port 151. It can be greater than the resistance to the incoming drain flow. As a result, even when the flow rate of the drain that flows backward into the vehicle interior is high, the delay in timing for closing the second communication port 151 is prevented, and the function of preventing the drain outflow from the second valve chamber 150 is improved. Can be planned. As a result, the backflow of drain into the vehicle interior can be suppressed.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, in the above-described embodiment, the case where the water sealing device 100, 200, 300, 400 is used for the Shinkansen 1 is described. However, the present invention is not necessarily limited to this. For example, other high-speed vehicles (for example, linear motor cars) ) And fuel cells are naturally possible. That is, the water sealing device in the present invention is an airtight chamber in which the pressure difference between the internal pressure and the external pressure varies, and is for discharging the drain generated in the airtight chamber to the outside of the airtight chamber, The target (for example, vehicle compartment) of an airtight room is not limited.

  In the first embodiment, the case where the dimension C is set larger than the value obtained by adding the dimension B to the dimension A has been described. However, the present invention is not necessarily limited to this, and the dimension C is changed from the dimension A to the dimension B. May be set equal to the value obtained by adding or B may be set smaller than the value obtained by adding the dimension B to the dimension A. In the first embodiment, the case where the dimension D is set larger than the value of the dimension C has been described. However, the present invention is not necessarily limited to this, and the dimension D is set equal to the value of the dimension C. May be.

  In the first embodiment, in order to form a gap between the second valve body 160 and the third communication port 152 when the second valve body 160 comes close to the third communication port 152, the second valve chamber 150. Although the case where the annular groove 153 is formed in the inside has been described, the present invention is not necessarily limited thereto. For example, instead of the annular groove 153, a net-like member covering the third communication port 152 is provided in the second valve chamber 150. May be provided. Accordingly, when the second valve body 160 is close to the third communication port 152, a gap is formed between the second valve body 160 and the third communication port 152, so that the second valve body 160 is connected to the third communication port 152. It is possible to prevent the drain 152 from being firmly attached to the mouth 152 and prevent the drain from being discharged.

  In the third embodiment, the case where the liquid level of the drain in the first valve chamber 120 is detected by the float 370 has been described. However, the present invention is not necessarily limited to this. For example, the drain is generated using ultrasonic waves, lasers, or the like. The liquid level of the drain in the first valve chamber 120 is detected by a non-contact type detector that detects the liquid level of the first valve chamber 120 or a contact type detector that detects the liquid level of the drain by touching the drain. Also good.

  In the third embodiment, the case where the first valve 330 operates simply by turning the switch 380 off or on has been described. However, the present invention is not necessarily limited to this. A device may be provided, and the operation of the first valve 330 may be controlled by such a control device in addition to turning the switch 380 off or on. For example, when the switch 380 is switched from OFF to ON, a time lag is given to the operation of the first valve 330 to delay the communication of the first flow path 101. Thereby, even when the flow rate of the drain is high, the airtightness of the interior of the vehicle interior can be reliably maintained.

It is a side view of the Shinkansen in which the water seal apparatus in 1st Embodiment of this invention is used. It is sectional drawing which shows the internal structure of a water sealing apparatus. (A) is a top view of a 1st valve body, (b) is sectional drawing of the 1st valve body in the IIIb-IIIb line | wire of Fig.3 (a). It is explanatory drawing explaining the state of a water sealing apparatus. It is sectional drawing which shows the internal structure of the water sealing apparatus in 2nd Embodiment. It is sectional drawing which shows the internal structure of the water sealing apparatus in 3rd Embodiment. It is sectional drawing which shows the internal structure of the water sealing apparatus in 4th Embodiment. It is explanatory drawing explaining the effect | action of a resistance part.

101 First channel 102 Orifice 105 Second channel 300 Water seal device 310 First valve device 320 First valve chamber 330 First valve 370 Float (liquid level detecting means)
340 Second valve device 150 Second valve chamber 151 Second communication port 152 Third communication port 153 Annular groove (gap forming means)
360 Second valve body

Claims (4)

In a water-sealing device that is a hermetic chamber in which a pressure difference between an internal pressure and an external pressure fluctuates and drains generated in the hermetic chamber to the outside of the hermetic chamber,
A first flow path communicating with the inside of the hermetic chamber;
A second flow path communicating with the first flow path and communicating with the outside of the hermetic chamber;
A first valve device provided between the airtight chamber and the first flow path;
A second valve device provided between the first flow path and the second flow path,
The first valve device includes:
A first valve chamber provided in communication with the airtight chamber and into which the drain flows;
A liquid level detection means for detecting the liquid level of the drain in the first valve chamber;
A first valve that shuts off the first flow path according to the liquid level of the drain in the first valve chamber detected by the liquid level detection means,
When the liquid level of the drain in the first valve chamber detected by the liquid level detection means is lower than a predetermined height, the first flow path is blocked by the first valve, while the liquid level detection When the liquid level of the drain in the first valve chamber detected by the means is higher than the predetermined height, the first flow path is configured to communicate,
The second valve device includes:
A second valve chamber provided in communication with the second flow path;
A second communication opening formed in the second valve chamber and communicated with the first flow path;
A second valve body that is housed in the second valve chamber and operates by a pressure difference between a drain head pressure at the second communication port position and a pressure outside the hermetic chamber;
When the pressure outside the hermetic chamber is higher than the water head pressure, the second valve body closes the second communication port to shut off the first flow path and the second valve chamber, When the pressure outside the hermetic chamber is lower than the water head pressure, the first flow path and the second valve chamber are configured to communicate with each other .
The second communication port is located above the first flow path and is provided on the bottom surface of the second valve chamber,
The second valve body is configured to float on the liquid level of the drain that has flowed into the second valve chamber and to operate following the change in the liquid level of the drain in the second valve chamber,
The second valve device closes the second communication port by the second valve body when the drain liquid level in the second valve chamber is lower than the position of the second communication port. When the first flow path and the second valve chamber are blocked, and the liquid level of the drain in the second valve chamber is higher than the position of the second communication port, the first flow path and the second flow path A water seal device configured to communicate with a valve chamber . The liquid level detecting means is accommodated in the first valve chamber and floats on the drain liquid level flowing into the first valve chamber and operates following the change in the drain liquid level in the first valve chamber. Is configured to detect the liquid level of the drain in the first valve chamber based on the operation of the float,
The water sealing device according to claim 1, wherein the first valve is configured to block the first flow path in conjunction with the operation of the float.   The water sealing device according to claim 1, wherein the first flow path includes an orifice that restricts a cross-sectional area of the flow path. A third communication port formed in the second valve chamber and communicated with the second flow path;
A gap forming means provided in the second valve chamber for forming a gap between the second valve body and the third communication port when the second valve body is close to the third communication port; The water seal device according to any one of claims 1 to 3, wherein the water seal device is provided.

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