JPWO2009014218A1 - Channel opening / closing device - Google Patents

Abstract

The on-off valve provided at the connecting part between the drain pipe and the drain hose prevents the generation of noise due to the back flow of the drain water. The flow path opening / closing device (1) includes a drain pipe (3) connected to a drain pan (2) for storing drain water, and a drain hose ( 4) and an on-off valve (5) provided at a connection portion between the drain pipe (3) and the drain hose (4). When the pressure in the drain pipe (3) is smaller than the pressure in the drain hose (4), the on-off valve (5) has a flow path in the drain pipe (3) and a flow in the drain hose (4). It is configured not to communicate with the road. The on-off valve (5) is swingable with respect to the attachment portion (51) attached to the end of the drain pipe (3) and the attachment portion (51), and the pressure in the drain pipe (3) is reduced. And a lid portion (53) disposed at a position to close the end portion of the drain pipe 3 when the pressure in the drain hose (4) is smaller than that.

Description

  The present invention relates to a flow path opening / closing device, and more particularly, to a flow path opening / closing device provided in a storage portion that stores drain water condensed by an evaporator of an air conditioner indoor unit.

  In general, along with the operation of the air conditioner, drain water is generated in the evaporator of the indoor unit. And after this drain water is stored by the drain pan, it is discharged | emitted outside via the drain hose connected to the drain pan and the drain pipe connected to the drain pan. Various techniques relating to such a drain water discharge mechanism have been proposed (see, for example, Patent Documents 1 to 3).

  In the gas-liquid discharge device disclosed in Patent Document 1, a check valve is attached to the tip of a drain pipe connected to the drain pan, and a gas such as exhaust air passes through the drain pipe to which the check valve is attached. It is introduced into the exhaust section. In this gas-liquid discharge device, the drain water discharged from the drain pipe is guided to the exhaust section, so that the gas such as exhaust air and the drain water are discharged through a common passage. The check valve attached to the check valve of the drain pipe closes the end of the drain pipe by the exhaust flow guided to the exhaust section, and prevents the exhaust from flowing back to the drain pan side.

  Moreover, in the said patent document 2, while it is in an open state by the air flow discharged | emitted from the inside of a hose at the terminal of the hose (drain hose) extended from the room to the outdoor, the air flow from the outside into a hose Discloses a flow path opening / closing device provided with a flow path opening / closing blade that is closed. The swing shaft that opens or closes the flow path opening / closing blade is attached to the outer peripheral surface of the tip of the hose so that dust contained in the air passing through the hose does not adhere to the swing shaft. .

  Further, Patent Document 3 discloses a drainage device that connects a drain outlet of a drain pan in an air conditioner (indoor unit) and an external drain outlet by a drain pipe (drain hose) and closes the drain outlet with a rubber sheet. It is disclosed. In this drainage device, drain water is drained by opening a rubber sheet that closes the drainage port by the pressure of drain water flowing toward the drainage port.

JP 2004-28457 A JP 2006-145108 A JP-A-5-172356

  By the way, as shown in FIG. 9, the interior of a house in recent years has high airtightness, and the pressure in the room may be lower than the atmospheric pressure due to various factors such as the operation of a ventilation fan. In this case, there is a disadvantage that the drain water remaining in the drain hose flows backward.

  FIG. 10 is a schematic diagram for explaining the generation of a water seal sound that occurs when drain water flows backward in the drain hose. As shown in FIG. 10, a drain pipe for discharging drain water stored in the drain pan is connected to the drain pan provided in the indoor unit. A drain hose is connected to the drain pipe, and drain water is discharged to the outside through the drain hose.

  The generation of abnormal noise due to the backflow of drain water will be described in detail. At point A related to the connecting portion between the drain pan and the drain pipe, the back flow of the drain water makes it difficult for the drain water to be discharged from the drain pan. An abnormal noise is generated when water is discharged like a jet. Further, at the point B where the drain hose is bent, when the accumulated drain water flows backward, it becomes a wavy state, a drain water film is formed in the drain hose, and the film ruptures and generates abnormal noise. . Further, at the point C where the drain hose is bent, when drain water is rolled up by the negative pressure in the room, a drain water film is formed in the drain hose, and abnormal noise is generated when the film ruptures.

  Moreover, in the gas-liquid discharge device disclosed in Patent Document 1, it is necessary to connect a drain hose to the exhaust part in order to guide the drain water led from the drain pipe to the exhaust part. In this case, when the indoor pressure becomes smaller than the atmospheric pressure, the check valve attached to the drain pipe can prevent the exhaust gas introduced into the exhaust part from flowing backward to the drain pan side. There has been a problem that drain water may flow backward toward the exhaust part and noise may be generated.

  In addition, when a member for opening and closing the drain water channel is provided outdoors, such as the channel opening and closing device and the rubber sheet described in Patent Documents 2 and 3, the member for opening and closing the drain water channel is provided. There was a disadvantage that the deterioration under the influence of the external environment became remarkable.

  Therefore, the above inconvenience can be solved by attaching the flow path opening / closing device of Patent Document 2 and the rubber sheet of Patent Document 3 to the connecting portion between the drain pipe and the drain hose connected to the indoor drain pan. However, the flow path opening / closing device described in Patent Document 2 is a technique that has been proposed on the premise that it is attached to the end of the drain hose, so that the flow path opening / closing device is connected to the drain pipe and the drain hose. When attached, the swing shaft is disposed on the outer peripheral surface of the drain pipe, and the drain hose cannot be connected to the drain pipe. Moreover, since the rubber sheet described in Patent Document 3 is also a technique that has been proposed on the assumption that it is attached to the end of the drain hose, if the rubber sheet is attached to the connection portion between the drain pipe and the drain hose, The rubber sheet protrudes from the area surrounded by the outer periphery of the end of the pipe, and the drain hose cannot be connected to the drain pipe.

  Accordingly, the present invention has been made to solve the above-described problems, and drain water is provided by a channel opening / closing mechanism provided at a connection portion between the first channel tube and the second channel tube. An object of the present invention is to provide a flow path opening / closing device that prevents the generation of abnormal noise due to backflow.

  A flow path opening / closing apparatus according to a first aspect of the present invention includes a first flow path pipe connected to a storage section for storing drain water inside the indoor unit, and a drain water drainage downstream side of the first flow path pipe. A second flow path pipe disposed; and a flow path opening / closing mechanism provided at a connection portion between the first flow path pipe and the second flow path pipe. The flow path opening / closing mechanism does not communicate the flow path in the first flow path pipe with the flow path in the second flow path pipe when the pressure in the first flow path pipe is smaller than the pressure in the second flow path pipe. It is configured as follows.

  In this flow path opening / closing device, the flow path opening / closing device is provided at a connection portion between the first flow path pipe and the second flow path pipe due to a pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe. Since the flow path opening / closing mechanism prevents the flow path in the first flow path pipe from communicating with the flow path in the second flow path pipe, it is possible to prevent the drain water from flowing backward due to the pressure difference. As a result, it is possible to prevent abnormal noise from occurring due to the backflow of drain water. As described above, the present invention uses the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe, which causes the backflow of drain water, to the flow path in the first flow path pipe. Since it prevents the flow of drain water from communicating with the flow path in the second flow path pipe and prevents the generation of abnormal noise due to the reverse flow of drain water, it reliably prevents the generation of abnormal noise. can do. In addition, since the flow path opening / closing mechanism is not exposed to the external environment by providing the flow path opening / closing mechanism at the connection portion between the first flow path pipe and the second flow path pipe, Becomes longer.

  A flow path opening / closing apparatus according to a second aspect is the flow path opening / closing apparatus according to the first aspect, wherein the flow path opening / closing mechanism has an open / close valve, and the open / close valve is an end portion of the first flow path pipe. And a mounting portion disposed inside a region surrounded by the outer periphery of the end portion of the first flow path pipe, and swingable with respect to the mounting section, wherein the pressure in the first flow path pipe is When the pressure in the second channel pipe is lower than the pressure in the first channel pipe, it is disposed at a position that closes the end of the first channel pipe and is larger than the area surrounded by the inner periphery of the end of the first channel pipe. And a lid portion smaller than a region surrounded by the outer periphery of the end portion.

In this flow path opening / closing apparatus, the lid portion swings due to the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe, and closes the end of the first flow path pipe. Thereby, the flow path in the 1st flow path pipe and the flow path in the 2nd flow path pipe stop communicating, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, in the present invention, it is possible to prevent the generation of abnormal noise with a simple configuration of the attachment portion attached to the end portion of the first flow path pipe and the lid portion that can swing with respect to the attachment portion. . Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.
Further, in this flow path opening and closing device, the mounting portion is disposed inside the region surrounded by the outer periphery of the end portion of the first flow path tube, and the size of the lid portion is set to the end portion of the first flow path tube. By making the area larger than the area surrounded by the inner periphery and smaller than the area surrounded by the outer periphery of the end portion of the first flow path pipe, the flow path in the first flow path pipe and the flow path in the second flow path pipe are not communicated. In this manner, the attachment portion and the lid portion can be prevented from protruding from the region surrounded by the outer periphery of the first flow path tube. Accordingly, when the first flow path tube and the second flow path pipe are connected by inserting the first flow path tube into the second flow path tube, the first flow path pipe provided with the lid portion is changed to the first flow path pipe. It can be easily inserted into the inside of the two flow path pipes. Therefore, the second flow path pipe can be directly connected to the first flow path pipe provided with the on-off valve, and it becomes easy to secure a discharge flow path for discharging drain water in the apparatus to the outside.

  A flow path opening / closing apparatus according to a third aspect of the present invention is the flow path opening / closing apparatus according to the first aspect, wherein the flow path opening / closing mechanism has an open / close valve, and the open / close valve is an end of the first flow path pipe. And an attachment portion disposed inside a region surrounded by the outer periphery of the end portion of the first flow path tube, and a first portion extending from the attachment portion and blocking a part of the end portion of the first flow path tube. When the pressure in the first flow path pipe is smaller than the pressure in the second flow path pipe, a part other than the end part of the first flow path pipe And a second lid portion disposed at a position where the portion is closed. The size of the first lid portion and the second lid portion is larger than the region surrounded by the inner periphery of the end portion of the first flow channel tube and smaller than the region surrounded by the outer periphery of the end portion of the first flow channel tube.

In this flow path opening / closing apparatus, the second lid portion swings so as to block only a portion other than a part of the end portion of the first flow path tube, so that the entire end portion of the first flow path tube is blocked. Compared to the case of swinging, the swinging of the second lid portion is less likely to be hindered by the second flow path pipe. As a result, when the pressure in the first flow path pipe becomes smaller than the pressure in the second flow path pipe, the flow path in the first flow path pipe and the flow path in the second flow path pipe are not reliably communicated. Can be.
Further, in this flow path opening / closing apparatus, the attachment portion is disposed inside the region surrounded by the outer periphery of the end portion of the first flow path pipe, and the sizes of the first lid portion and the second lid portion are set to the first size. By making the area larger than the area surrounded by the inner periphery of the end portion of the flow path tube and smaller than the area surrounded by the outer periphery of the end portion of the first flow path tube, the flow path in the first flow path tube and the second flow path tube It is possible to prevent the attachment portion and the lid portion (the first lid portion and the second lid portion) from protruding from the region surrounded by the outer periphery of the first flow channel pipe, while preventing the flow channel from communicating with each other. Thereby, when connecting a 1st flow path pipe and a 2nd flow path pipe by inserting a 1st flow path pipe in a 2nd flow path pipe, a 1st cover part and a 2nd cover part are provided. The first channel pipe can be easily inserted into the second channel pipe. Therefore, the second flow path pipe can be directly connected to the first flow path pipe provided with the on-off valve, and it becomes easy to secure a discharge flow path for discharging drain water in the apparatus to the outside.

  A flow path opening / closing apparatus according to a fourth aspect of the present invention is the flow path opening / closing apparatus according to any of the second or third aspects, wherein the attachment portion is attached to a notch formed on the outer peripheral surface of the first flow path pipe. It is done.

  In this flow path opening / closing apparatus, the mounting portion attached to the outer peripheral surface of the first flow path pipe is attached to the cutout portion, so that the first flow path pipe is attached from the region surrounded by the outer periphery of the portion where the cutout portion is not provided. It is possible to prevent the part from protruding. Accordingly, when the first flow path tube is inserted into the second flow path pipe, the first flow path pipe provided with the attachment portion is connected to the first flow path pipe when the first flow path pipe and the second flow path pipe are connected. It can be easily inserted into the inside of the two flow path pipes. Therefore, the second flow path pipe can be directly connected to the first flow path pipe to which the attachment portion is attached, and it is easy to secure a discharge flow path for discharging drain water in the device to the outside.

  A flow path opening / closing apparatus according to a fifth aspect is the flow path opening / closing apparatus according to the fourth aspect, wherein the notch is formed at a position corresponding to an upper portion of the outer peripheral surface of the first flow path pipe.

  In this flow path opening and closing device, the mounting portion is mounted at a position corresponding to the upper side on the outer peripheral surface of the first flow channel pipe, so that drain water flowing below the flow path in the first flow channel pipe is attached to the mounting section. It is possible to suppress the flow to the portion that is formed. Thereby, it can suppress that the scale and dust which flow with drain water adhere to the part to which an attaching part is attached. As a result, it is possible to suppress corrosion or mold generation in the first flow path pipe.

  A flow path opening / closing apparatus according to a sixth aspect is the flow path opening / closing apparatus according to the first aspect, wherein the flow path opening / closing mechanism communicates the flow path in the first flow path pipe with the flow path in the second flow path pipe. A casing provided with a flow path for causing the first flow path and the first flow path when the pressure in the first flow path pipe is lower than the pressure in the second flow path pipe. And an on-off valve disposed at a position for closing the end of the flow channel pipe.

  In this flow path opening / closing device, the open / close valve moves due to the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe, and closes the end of the first flow path pipe. Thereby, the flow path in the 1st flow path pipe and the flow path in the 2nd flow path pipe stop communicating, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, according to the present invention, the generation of noise can be prevented with a simple configuration in which an open / close valve that is not fixed is provided inside the flow path in the casing. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.

  The flow path opening / closing apparatus according to a seventh aspect of the present invention is the flow path opening / closing apparatus according to any of the second to sixth aspects, wherein the on-off valve has a pressure in the first flow path pipe equal to or higher than the pressure in the second flow path pipe. In this case, the end portion of the first flow path pipe is not blocked.

  In this flow path opening / closing device, when the pressure in the first flow path pipe is equal to or higher than the pressure in the second flow path pipe, the end of the first flow path pipe is opened in the open / close valve. It is possible to prevent the open / close valve to which dust or the like has adhered from drying in a state where the end of the first flow path tube is closed. As a result, it is possible to prevent the end portion of the first flow path pipe from being fixed in the closed state.

  A flow path opening / closing apparatus according to an eighth aspect of the present invention is the flow path opening / closing apparatus according to the first aspect, wherein the flow path opening / closing mechanism has an open / close valve attached to the second flow path pipe.

  In this flow path opening / closing apparatus, when there are a plurality of flow path pipes connected to the storage part in addition to the first flow path pipe, the opening / closing valve is attached and detached during construction. Since the on-off valve can be directly attached to the two-channel pipe, forgetting to attach the on-off valve can be prevented.

  A flow path opening / closing apparatus according to a ninth aspect is the flow path opening / closing apparatus according to the eighth aspect, wherein the open / close valve is attached to the inside of the second flow path pipe, and extends from the attachment portion. A first lid that closes a portion of the end of one channel pipe and swingable with respect to the first lid, and the pressure in the first channel pipe is less than the pressure in the second channel pipe A second lid portion disposed at a position that closes a portion other than a portion of the end portion of the first flow channel pipe, and the size of the first lid portion and the second lid portion is the end portion of the first flow channel tube. Is larger than the region surrounded by the inner periphery of the first channel pipe and smaller than the region surrounded by the outer periphery of the end portion of the first flow path pipe.

In this flow path opening / closing apparatus, the lid portion swings due to the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe, and closes the end of the first flow path pipe. Thereby, the flow path in the 1st flow path pipe and the flow path in the 2nd flow path pipe stop communicating, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, according to the present invention, it is possible to prevent the generation of abnormal noise with a simple on-off valve. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.
Moreover, in this flow path opening / closing device, the first flow path pipe can be easily arranged with respect to the second flow path pipe to which the open / close valve is attached by disposing the open / close valve inside the second flow path pipe. It is possible to connect, and it becomes easy to secure a discharge channel for discharging drain water in the device to the outside.

  A flow path opening / closing apparatus according to a tenth aspect of the present invention is the flow path opening / closing apparatus according to the ninth aspect of the present invention, wherein a slit-shaped recess is provided on the inner peripheral surface of the second flow path pipe, and the opening / closing valve mounting portion A slit-like convex portion to be inserted into the concave portion is provided on the outer peripheral surface of the.

  In this flow path opening / closing device, the open / close valve can be attached to an accurate position with respect to the second flow path pipe.

  According to an eleventh aspect of the present invention, in the flow path opening / closing apparatus according to the tenth aspect, a slit-like convex portion to be inserted into the concave portion is provided on the outer peripheral surface of the first channel pipe.

  In this flow path opening / closing device, the first flow path pipe can be attached at an accurate position with respect to the second flow path pipe.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the flow provided in the connection portion between the first flow path pipe and the second flow path pipe due to the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe. Since the path opening / closing mechanism prevents the flow path in the first flow path pipe from communicating with the flow path in the second flow path pipe, it is possible to prevent the drain water from flowing backward due to the pressure difference. As a result, it is possible to prevent abnormal noise from occurring due to the backflow of drain water. As described above, the present invention uses the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe, which causes the backflow of drain water, to the flow path in the first flow path pipe. Since it prevents the flow of drain water from communicating with the flow path in the second flow path pipe and prevents the generation of abnormal noise due to the reverse flow of drain water, it reliably prevents the generation of abnormal noise. can do. In addition, since the flow path opening / closing mechanism is not exposed to the external environment by providing the flow path opening / closing mechanism at the connection portion between the first flow path pipe and the second flow path pipe, Becomes longer.

In the second invention, the lid portion swings due to the pressure difference between the pressure in the first flow path tube and the pressure in the second flow path tube, and closes the end of the first flow path tube. Thereby, the flow path in the 1st flow path pipe and the flow path in the 2nd flow path pipe stop communicating, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, in the present invention, it is possible to prevent the generation of abnormal noise with a simple configuration of the attachment portion attached to the end portion of the first flow path pipe and the lid portion that can swing with respect to the attachment portion. . Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.
Further, in this flow path opening and closing device, the mounting portion is disposed inside the region surrounded by the outer periphery of the end portion of the first flow path tube, and the size of the lid portion is set to the end portion of the first flow path tube. By making the area larger than the area surrounded by the inner periphery and smaller than the area surrounded by the outer periphery of the end portion of the first flow path pipe, the flow path in the first flow path pipe and the flow path in the second flow path pipe are not communicated. In this manner, the attachment portion and the lid portion can be prevented from protruding from the region surrounded by the outer periphery of the first flow path tube. Accordingly, when the first flow path tube and the second flow path pipe are connected by inserting the first flow path tube into the second flow path tube, the first flow path pipe provided with the lid portion is changed to the first flow path pipe. It can be easily inserted into the inside of the two flow path pipes. Therefore, the second flow path pipe can be directly connected to the first flow path pipe provided with the on-off valve, and it becomes easy to secure a discharge flow path for discharging drain water in the apparatus to the outside.

In the third aspect of the invention, the second lid swings so as to block only a portion other than a part of the end portion of the first flow path pipe, so that the entire end portion of the first flow path pipe is closed. Compared with the case where the second lid portion swings, the second flow path tube is less likely to prevent the second lid portion from swinging. As a result, when the pressure in the first flow path pipe becomes smaller than the pressure in the second flow path pipe, the flow path in the first flow path pipe and the flow path in the second flow path pipe are not reliably communicated. Can be.
Further, in this flow path opening / closing apparatus, the attachment portion is disposed inside the region surrounded by the outer periphery of the end portion of the first flow path pipe, and the sizes of the first lid portion and the second lid portion are set to the first size. By making the area larger than the area surrounded by the inner periphery of the end portion of the flow path tube and smaller than the area surrounded by the outer periphery of the end portion of the first flow path tube, the flow path in the first flow path tube and the second flow path tube It is possible to prevent the attachment portion and the lid portion (the first lid portion and the second lid portion) from protruding from the region surrounded by the outer periphery of the first flow channel pipe, while preventing the flow channel from communicating with each other. Thereby, when connecting a 1st flow path pipe and a 2nd flow path pipe by inserting a 1st flow path pipe in a 2nd flow path pipe, a 1st cover part and a 2nd cover part are provided. The first channel pipe can be easily inserted into the second channel pipe. Therefore, the second flow path pipe can be directly connected to the first flow path pipe provided with the on-off valve, and it becomes easy to secure a discharge flow path for discharging drain water in the apparatus to the outside.

  Moreover, in 4th invention, from the area | region enclosed by the outer periphery of the part in which the notch part of the 1st flow path pipe is not provided by attaching the attachment part attached to the outer peripheral surface of a 1st flow path pipe to a notch part. The mounting portion can be prevented from protruding. Accordingly, when the first flow path tube is inserted into the second flow path pipe, the first flow path pipe provided with the attachment portion is connected to the first flow path pipe when the first flow path pipe and the second flow path pipe are connected. It can be easily inserted into the inside of the two flow path pipes. Therefore, the second flow path pipe can be directly connected to the first flow path pipe to which the attachment portion is attached, and it is easy to secure a discharge flow path for discharging drain water in the device to the outside.

  In the fifth aspect of the invention, the attachment portion is attached at a position corresponding to the upper portion on the outer peripheral surface of the first flow channel pipe, so that the drain water flowing below the flow channel in the first flow channel pipe is attached to the attachment portion. It can prevent flowing to the part to be attached. Thereby, it is possible to prevent the water scale and dust flowing together with the drain water from adhering to the portion to which the attachment portion is attached. As a result, it is possible to prevent corrosion or mold generation in the first flow path pipe.

  In the sixth aspect of the invention, the opening / closing valve moves due to the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe to close the end of the first flow path pipe. Thereby, the flow path in the 1st flow path pipe and the flow path in the 2nd flow path pipe stop communicating, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, according to the present invention, the generation of noise can be prevented with a simple configuration in which an open / close valve that is not fixed is provided inside the flow path in the casing. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.

  In the seventh aspect of the invention, when the pressure in the first flow path pipe is equal to or higher than the pressure in the second flow path pipe, the open / close valve opens the end of the first flow path pipe. It is possible to prevent the on-off valve to which scale or dust adheres from being dried while closing the end of the first flow path pipe. As a result, it is possible to prevent the end portion of the first flow path pipe from being fixed in the closed state.

  In addition, in the eighth invention, when there are a plurality of channel pipes connected to the storage part in addition to the first channel pipe, the on-off valve is attached and detached during construction. Since the on-off valve can be directly attached to the second flow path pipe, forgetting to attach the on-off valve can be prevented.

In the ninth invention, the lid portion swings due to the pressure difference between the pressure in the first flow path pipe and the pressure in the second flow path pipe, and closes the end of the first flow path pipe. Thereby, the flow path in the 1st flow path pipe and the flow path in the 2nd flow path pipe stop communicating, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, according to the present invention, it is possible to prevent the generation of abnormal noise with a simple on-off valve. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.
Moreover, in this flow path opening / closing device, the first flow path pipe can be easily arranged with respect to the second flow path pipe to which the open / close valve is attached by disposing the open / close valve inside the second flow path pipe. It is possible to connect, and it becomes easy to secure a discharge channel for discharging drain water in the device to the outside.

  In the tenth invention, the on-off valve can be attached to the second passage pipe at an accurate position.

  In the eleventh aspect, the first channel pipe can be attached to the second channel pipe at an accurate position.

It is the side view which showed the flow-path opening / closing apparatus which concerns on 1st Embodiment of this invention. It is the perspective view which showed the drain pipe of the flow-path opening / closing apparatus shown in FIG. It is the perspective view which showed the on-off valve attached to the drain pipe shown in FIG. It is the front view which showed the edge part and the on-off valve of the drain pipe of the flow-path opening / closing apparatus shown in FIG. It is the figure which showed the internal structure of the flow-path opening / closing apparatus which concerns on 2nd Embodiment of this invention. It is a disassembled perspective view of the flow-path opening-and-closing apparatus concerning 3rd Embodiment of this invention. It is sectional drawing of the flow-path opening / closing apparatus which concerns on 3rd Embodiment of this invention. It is the figure which showed the modification of the on-off valve of the flow-path opening / closing apparatus which concerns on 1st Embodiment shown in FIG. It is the schematic diagram which showed the drain hose extended indoors and the outdoor where an indoor unit is arrange | positioned. It is the schematic for demonstrating generation | occurrence | production of the water sealing sound produced when drain water flows backward in the drain hose.

Explanation of symbols

1, 100, 200 Flow path opening / closing device 2 Drain pan 3, 103, 203 Drain pipe 4, 104, 204 Drain hose 5, 205 Open / close valve 15a, 51, 251 Mounting portion 15b, 252 Lid (first lid)
15d, 254 Lid (second lid)
31 Notch 53 Lid 105 Channel Open / Close Valve 151 Casing 152 Open / Close Valve

  Hereinafter, an embodiment of a flow path opening and closing device according to the present invention will be described based on the drawings.

(First embodiment)
FIG. 1 is a side view showing a flow path opening / closing device according to a first embodiment of the present invention. 2-4 is a figure for demonstrating the detail of the flow-path opening / closing apparatus shown in FIG. Hereinafter, with reference to FIGS. 1-4, the flow path opening / closing apparatus 1 which concerns on 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the flow path opening / closing device 1 of the present embodiment is provided in a drain pan 2 provided inside an indoor unit of an air conditioner, and discharges drain water stored in the drain pan 2. The flow path opening / closing device 1 includes a drain pipe 3 connected to a drain pan 2, a drain hose 4 disposed downstream of the drain pipe 3 in the drain water drain direction, and a connection between the drain pipe 3 and the drain hose 4. And an on-off valve 5 provided in the portion. The drain pan 2 stores drain water condensed by the evaporator of the indoor unit, and a comb-like three-dimensional structure 6 is erected in multiple stages toward the drain pipe 3 on the bottom surface. Yes.

  The drain pipe 3 is provided for discharging drain water in the drain pan 2 that has been condensed and dropped by the evaporator of the indoor unit. The drain pipe 3 has a cylindrical shape as shown in FIG. And the drain pipe 3 inclines below so that the drain water in the drain pan 2 may flow downstream. Here, in 1st Embodiment, the notch part 31 is formed in the position corresponding to the upper direction in the outer peripheral surface of the drain pipe 3. As shown in FIG. The notch 31 has a flat portion 31a on which a mounting portion 51 of the on-off valve 5 described later is installed. The flat portion 31a has two connection pins 51a (see FIG. 1) of the mounting portion 51 described later. Two fitting holes 31b to be fitted with each other are formed.

  The drain hose 4 is provided to guide drain water flowing through the drainage pipe 3 to the outside. The drain hose 4 has a cylindrical shape. As shown in FIG. 1, the drain hose 4 has substantially the same inner diameter as the outer diameter of the drainage pipe 3, and is connected to the drainage pipe 3 by inserting the drainage pipe 3 therein.

  The on-off valve 5 has a function of preventing the drain water remaining in the drain hose 4 from flowing backward. As shown in FIG. 3, the on-off valve 5 includes an attachment portion 51 attached to a notch 31 formed in the drain pipe 3, a hinge portion 52 attached to the attachment portion 51, and an attachment portion via the hinge portion 52. 51, and a lid portion 53 supported so as to be swingable with respect to 51.

  The attachment portion 51 is provided with a connection pin 51a to be inserted into two fitting holes 31b (see FIG. 2) formed in the flat portion 31a of the notch 31 described above. And by connecting pin 51a being inserted in fitting hole 31b of flat part 31a, on-off valve 5 including attaching part 51 is directly attached to drain pipe 3 which is a structure of an indoor unit. And the attaching part 51 is arrange | positioned inside the area | region enclosed by the outer periphery of the part in which the notch part 31 of the drainage pipe 3 is not provided by attaching to the flat part 31a of the notch part 31. FIG.

  The lid portion 53 is disposed at a position that closes the end of the drain pipe 3 when the pressure in the drain pipe 3 is smaller than the pressure in the drain hose 4 (see FIGS. 1B and 3B), and When the pressure in the drain pipe 3 is equal to or higher than the pressure in the drain hose 4, the drain pipe 3 is disposed at a position where the end of the drain pipe 3 is not blocked (see FIG. 1 (a) and FIG. 3 (a)). That is, the lid 53 closes the end of the drain pipe 3 in a state where the pressure in the room in which the indoor unit is installed is lower than the atmospheric pressure (negative pressure state), and gravity due to its own weight in other normal states. It is arranged in the direction and the end of the drain pipe 3 is opened. Further, as shown in FIG. 4, the lid portion 53 has a substantially disk shape, and its size (area shown by oblique lines) is larger than the area surrounded by the inner periphery of the end of the drainage pipe 3, and It is smaller than the area surrounded by the outer periphery of the portion where the attachment portion 51 of the drain pipe 3 is not formed.

[Characteristics of the channel opening and closing device 1 according to the first embodiment]
The flow path opening / closing device 1 of the first embodiment has the following characteristics.

  In the flow path opening / closing device 1 according to the first embodiment, the open / close valve that is attached to the drainage pipe 3 due to a negative pressure inside the chamber and a pressure difference between the pressure in the drainage pipe 3 and the pressure in the drain hose 4. 5 prevents the flow path in the drain pipe 3 and the flow path in the drain hose 4 from communicating with each other, so that it is possible to prevent the drain water from flowing back due to the pressure difference. As a result, it is possible to prevent abnormal noise from occurring due to the backflow of drain water. As described above, the present embodiment uses the pressure difference between the pressure in the drain pipe 3 and the pressure in the drain hose 4 that causes the reverse flow of drain water, and the flow path in the drain pipe 3 and the drain hose. 4 is prevented from communicating with the flow path in 4 and prevents the backflow of drain water and prevents the generation of noise due to the backflow of drain water. Therefore, it is possible to reliably prevent the generation of noise. it can.

  In the first embodiment, since the opening / closing valve 5 is provided at the connection portion between the drain pipe 3 and the drain hose 4, the opening / closing valve 5 is not exposed to the external environment. Becomes longer.

  Further, in the flow path opening / closing device 1 of the first embodiment, the lid 53 swings due to the pressure difference between the pressure in the drain pipe 3 and the pressure in the drain hose 4 that generates negative pressure in the room. The end of the tube 3 is closed. Thereby, the flow path in the drain pipe 3 and the flow path in the drain hose 4 do not communicate with each other, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, in this embodiment, the simple structure of the attachment part 51 attached to the end part of the drain pipe 3, the hinge part 52 attached to the attachment part 51, and the lid part 53 swingable with respect to the attachment part 51. Thus, the generation of abnormal noise can be prevented. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.

  Further, in the flow path opening / closing device 1 of the first embodiment, the size of the lid 53 is larger than the region surrounded by the inner periphery of the end of the drainage pipe 3 and is surrounded by the outer periphery of the end of the drainage pipe 3. By making it smaller, the lid 53 does not protrude from the area surrounded by the outer periphery of the drain pipe 3 while preventing the flow path in the drain pipe 3 from communicating with the flow path in the drain hose 4. Can do. Thereby, when inserting the drain pipe 3 into the drain hose 4, the drain pipe 3 provided with the lid portion 53 can be easily inserted into the drain hose 4. Therefore, the drain hose 4 can be directly connected to the drain pipe 3 provided with the on-off valve 5, and it becomes easy to secure a discharge flow path for discharging drain water in the device to the outside.

  Further, in the flow path opening / closing device 1 of the first embodiment, the notch 31 of the drainage pipe 3 is provided by attaching the attachment part 51 to the flat part 31 a of the notch 31 formed on the outer peripheral surface of the drainage pipe 3. It is possible to prevent the attachment portion 51 from protruding from the region surrounded by the outer periphery of the portion that is not. Thereby, the drain pipe 3 to which the attachment part 51 is attached can be easily arranged inside the drain hose 4. Therefore, the drain hose 4 can be directly connected to the drain pipe 3 to which the mounting portion 51 is attached, and it becomes easy to secure a discharge flow path for discharging drain water in the device to the outside.

  In addition, in the flow path opening and closing device 1 of the first embodiment, the attachment portion 51 is attached at a position corresponding to the upper side on the outer peripheral surface of the drain pipe 3, so that drain water flowing below the flow path in the drain pipe 3 , It is possible to suppress the flow to the portion where the attachment portion 51 is attached. Thereby, it can suppress that the scale and dust which flow with drain water adhere to the part to which the attaching part 51 is attached. As a result, it is possible to suppress corrosion and mold generation in the drain pipe 3.

  Moreover, in the flow path opening / closing apparatus 1 of the first embodiment, when the pressure in the drain pipe 3 is equal to or higher than the pressure in the drain hose 4, the lid 53 opens the end of the drain pipe 3, It is possible to prevent the lid 53 to which drain water scale or dust adheres from being dried while the end of the drain pipe 3 is closed. As a result, it is possible to prevent the end of the drainage pipe 3 from being fixed in the closed state.

(Second Embodiment)
FIG. 5 is a diagram showing an internal structure of the flow path opening / closing device according to the second embodiment of the present invention. Next, with reference to FIG. 5, the flow path opening / closing device 100 according to the second embodiment of the present invention will be described. In the flow path opening / closing apparatus 100 of the second embodiment, the flow path opening / closing apparatus of the first embodiment is provided except that the flow path opening / closing valve 105 is provided instead of the open / close valve 5 of the first embodiment and the related matters. Since it is the same as the apparatus 1, the description is abbreviate | omitted.

  As shown in FIG. 5, the flow path opening / closing device 100 of the present embodiment includes a drain pipe 103 connected to a drain pan, a drain hose 104 disposed downstream of the drain pipe 103 in the drain water drain direction, A flow path opening / closing valve 105 provided at a connection portion between the pipe 103 and the drain hose 104 is provided.

  The channel opening / closing valve 105 has a function of preventing the drain water remaining in the drain hose 104 from flowing backward. The flow path opening / closing valve 105 is not fixed inside the casing 151 provided with a flow path for communicating the flow path in the drain pipe 103 and the flow path in the drain hose 104 and inside the flow path in the casing. And an on-off valve 152 provided in the above.

  The casing 151 includes an attachment portion 151a inserted into the drain pipe 103, an attachment portion 151b inserted into the drain hose 104, and a connection portion 151c provided between the attachment portions 151a and 151b. The attachment portion 151a is formed with a contact portion 151d that contacts the entire inner peripheral surface of the drain pipe 103, and the contact portion 151d contacts the inner peripheral surface of the drain pipe 103 to open and close the flow path. The valve 105 and the drain pipe 103 are connected. Similarly, the attachment portion 151 b is formed with an abutting portion 151 e that abuts on the entire inner peripheral surface of the drain hose 104, and the abutting portion 151 e abuts on the inner peripheral surface of the drain hose 104. Thus, the flow path opening / closing valve 105 and the drain hose 104 are connected. In addition, a flow path that communicates with the flow path in the drain pipe 103 is formed in the attachment portion 151a, and a flow path that communicates with the flow path in the drain hose 104 is formed in the attachment portion 151b.

  The on-off valve 152 is arranged in a state where it is not fixed inside the connecting portion 151c. And the on-off valve 152 is regulated so as to move along the arrow C direction by the regulating member 151f. Here, in the present embodiment, the on-off valve 152 is disposed at a position that closes the end of the drainage pipe 103 (the flow path of the attachment portion 151a) when the pressure in the drainage pipe 103 is smaller than the pressure in the drain hose 104. And when the pressure in the drain pipe 3 is more than the pressure in the drain hose 104, it arrange | positions in the position which does not block the edge part (flow path of the attaching part 151a) of the drain pipe 103. FIG. That is, the on-off valve 152 closes the end of the drainage pipe 103 when the negative pressure is generated in the room, and opens the end of the drainage pipe 103 in a normal state.

[Characteristics of the channel opening and closing device 100 according to the second embodiment]
The flow path opening / closing device 100 of the second embodiment has the following characteristics.

  In the flow path opening / closing device 100 of the second embodiment, the open / close valve 152 moves due to the pressure difference between the pressure in the drain pipe 103 and the pressure in the drain hose 104, and the end of the drain pipe 103 (of the mounting portion 151 a Block the flow path). Thereby, the flow path in the drain pipe 103 and the flow path in the drain hose 104 do not communicate with each other, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, in the present embodiment, it is possible to prevent the generation of abnormal noise with a simple configuration in which the on-off valve 152 that is not fixed inside the flow path in the casing 151 is provided. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.

(Third embodiment)
FIG. 6 is an exploded perspective view of the flow path opening / closing device according to the third embodiment of the present invention. FIG. 7 is a cross-sectional view of a flow path opening / closing device according to a third embodiment of the present invention. Next, with reference to FIG.6 and FIG.7, the flow-path opening / closing apparatus 200 which concerns on 3rd Embodiment of this invention is demonstrated. Unlike the first embodiment in which the on-off valve 5 is attached to the drain pipe 3 of the drain pan 2, the on-off valve 205 is attached to the drain hose 204 in the flow path opening / closing device 200 of the third embodiment. In the third embodiment, the description of the same parts as in the first embodiment will be omitted as appropriate.

  As shown in FIG. 6, the flow path opening / closing device 200 of the present embodiment includes a drain pipe 203 connected to the drain pan, a drain hose 204 disposed downstream of the drain pipe 203 in the drain water drain direction, An opening / closing valve 205 provided at a connection portion between the pipe 203 and the drain hose 204 is provided.

  The drain pipe 203 has a substantially cylindrical shape. And the drain pipe 203 inclines below so that the drain water in the drain pan 2 may flow downstream (refer FIG. 7). Here, in 3rd Embodiment, the slit-shaped convex part 203a extended in the connection direction (X direction) of the drain pipe 203 with respect to the drain hose 204 is formed in the outer peripheral surface of the drain pipe 203. FIG.

  The drain hose 204 is provided to guide drain water flowing through the drain pipe 203 to the outside. The drain hose 204 has a substantially cylindrical shape. A slit-like recess 204 a extending in the X direction is formed on the inner peripheral surface of the drain hose 204. The concave portion 204a is formed so as to correspond to the convex portion 203a of the drain pipe 203 described above. The drain hose 204 has an inner diameter that is substantially the same as the outer diameter of the drain pipe 203 and the on-off valve 205.

  The on-off valve 205 has a function of preventing the drain water remaining in the drain hose 204 from flowing backward. Here, in the present embodiment, the on-off valve 205 is attached inside the drain hose 204. The opening / closing valve 205 is attached to the drain hose 204, a cover 252 that extends from the mount 251 and closes a part of the downstream end of the drainage pipe 203, and the cover 252. A position that can swing with respect to the hinge part 253 and the lid part 252 and blocks a part other than a part of the downstream end of the drain pipe 203 when the pressure in the drain pipe 203 is smaller than the pressure in the drain hose. And a lid portion 254 disposed on the surface. A slit-like convex portion 251 a extending in the X direction is formed on the outer peripheral surface of the attachment portion 251. The convex portion 251a is formed so as to correspond to the concave portion 204a of the drain hose 204 described above.

  The lid 254 is disposed at a position where the end of the drain pipe 203 is closed when the pressure in the drain pipe 203 is smaller than the pressure in the drain hose 204 (see FIG. 7B), and When the pressure is equal to or higher than the pressure in the drain hose 204, the drain pipe 203 is disposed at a position where the end of the drain pipe 203 is not blocked (see FIG. 7A). That is, the lid 254 closes the end of the drainage pipe 203 in a state where the pressure in the room where the indoor unit is installed is lower than the atmospheric pressure (negative pressure state), and gravity due to its own weight in other normal states. Arranged in the direction to open the end of the drain pipe 203. Further, the sizes of the lid portions 252 and 254 are larger than the region surrounded by the inner periphery of the end portion of the drainage pipe 203, and the drainage pipes, like the lid portion 53 (see FIG. 4) according to the first embodiment. Smaller than the area surrounded by the outer periphery of the end of

  Moreover, the convex part 203a of the drain pipe 203, the convex part 251a of the on-off valve 205, and the concave part 204a of the drain hose 204 are all provided on the upper side of each member so that drain water does not enter the part.

Next, a method for assembling the flow path opening / closing device 200 will be described.
First, the position of the concave portion 204 a of the drain hose 204 and the convex portion 251 a of the on-off valve 205 is aligned, and the on-off valve 205 is inserted into the drain hose 204. Then, in a state where the on-off valve 205 is disposed inside the drain hose 204, the positions of the concave portion 204 a of the drain hose 204 and the convex portion 203 a of the drain pipe 203 are aligned, and the drain pipe 203 is placed inside the drain hose 204. Insert the downstream end. As described above, the downstream end portions of the opening / closing valve 205 and the drain pipe 203 are arranged inside the drain hose 204, and the flow path opening / closing device 200 is assembled.

[Characteristics of Channel Opening and Closing Device 200 According to Third Embodiment]
The flow path opening / closing device 200 of the third embodiment has the following characteristics.

  When there are a plurality of channel pipes connected to the drain pan in addition to the drain pipe 203, the opening / closing valve 205 is attached and detached during construction. In the channel opening / closing apparatus 200 of the third embodiment, the drain hose Since the on-off valve 205 can be directly attached to the 204, it is possible to prevent forgetting to attach the on-off valve 205.

  Further, in the flow path opening / closing apparatus 200 according to the third embodiment, the lid 254 is swung by the pressure difference between the pressure in the drain pipe 203 and the pressure in the drain hose 204 to block the end of the drain pipe 203. . Thereby, the flow path in the drain pipe 203 and the flow path in the drain hose 204 do not communicate with each other, and the backflow of drain water can be prevented. As a result, it is possible to prevent the generation of abnormal noise due to the backflow of drain water. That is, it is possible to prevent the generation of abnormal noise with the opening / closing valve 205 having a simple configuration. Therefore, it is possible to suppress an increase in cost associated with providing a member that prevents the generation of abnormal noise.

  Further, in the flow path opening / closing device 200 of the third embodiment, the drain pipe 203 can be easily connected to the drain hose 204 to which the opening / closing valve 205 is attached by arranging the opening / closing valve 205 inside the drain hose 204. It becomes easy to secure a discharge channel for discharging drain water in the device to the outside.

  Further, in the flow path opening / closing device 200 of the third embodiment, the convex portions 203a and 251a are provided on the drain pipe 203 and the open / close valve 205, respectively, so as to correspond to the concave portion 204a of the drain hose 204. Thus, the on-off valve 205 and the drain pipe 203 can be attached at accurate positions.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first embodiment, the attachment portion 51 attached to the end of the drain pipe 3, the hinge portion 52 attached to the attachment portion 51, and swingable with respect to the attachment portion 51, the drain pipe 3 Although the on-off valve 5 having the lid portion 53 disposed at a position for closing the end portion of the drain pipe 3 when the internal pressure is smaller than the pressure in the drain hose 4 has been described, the present invention is not limited thereto. For example, an on-off valve 15 according to a modification of the first embodiment shown in FIG. 8 includes an attachment portion 15a attached to an end portion (notch portion) of the drain pipe, and an end portion of the drain pipe extending from the attachment portion 15a. When the pressure in the drainage pipe is smaller than the pressure in the drain hose, the lid 15b can close the lid 15b, the hinge 15c attached to the lid 15b, and the lid 15b. And a lid portion 15d that is disposed at a position that closes a portion other than a portion of the end portion. Moreover, the magnitude | size of the cover parts 15b and 15d is larger than the area | region enclosed by the inner periphery of the edge part of a drain pipe similarly to the cover part 53 (refer FIG. 4) which concerns on 1st Embodiment, and a drain pipe It is smaller than the area surrounded by the outer periphery of the end.

  If the on-off valve 15 is used, the lid portion 15d swings so as to block only a portion other than a portion of the end portion of the first flow path pipe, and thus swings so as to block all the end portion of the drain pipe. Compared to the case, the swing of the lid portion 15d is less disturbed by the drain hose. As a result, when the pressure in the drain pipe becomes smaller than the pressure in the drain hose, the flow path in the drain pipe and the flow path in the drain hose can be reliably prevented from communicating with each other.

  Further, since the sizes of the lid portions 15b and 15d are larger than the region surrounded by the inner periphery of the end portion of the drain pipe and smaller than the region surrounded by the outer periphery of the end portion of the drain pipe, the flow path and the drain hose in the drain pipe It is possible to prevent the lid portions 15b and 15d from protruding from the region surrounded by the outer periphery of the drain pipe while preventing communication with the inner flow path. Thereby, when inserting a drain pipe in a drain hose, the drain pipe provided with the cover parts 15b and 15d can be easily inserted in the inside of a drain hose. Therefore, the drain hose can be directly connected to the drain pipe provided with the on-off valve 15, and it becomes easy to secure a discharge flow path for discharging drain water in the device to the outside.

  If this invention is utilized, it can prevent that abnormal noise generate | occur | produces with the reverse flow of drain water.

Claims (11)

A first flow path pipe (3, 103, 203) connected to a reservoir (2) for storing drain water inside the indoor unit;
A second channel pipe (4, 104, 204) disposed downstream of the first channel pipe in the drain water drain direction,
A channel opening / closing mechanism (5, 105, 205) provided at a connection portion between the first channel tube and the second channel tube;
When the pressure in the first flow path pipe is smaller than the pressure in the second flow path pipe, the flow path opening / closing mechanism includes a flow path in the first flow path pipe and a flow path in the second flow path pipe. The flow path opening and closing device (1, 100, 200), characterized in that it is configured not to communicate with each other. The channel opening / closing mechanism has an opening / closing valve (5),
The on-off valve is
An attachment portion (51) which is attached to an end portion of the first flow channel pipe and which is disposed inside a region surrounded by an outer periphery of the end portion of the first flow path tube;
It is swingable with respect to the mounting portion, and is disposed at a position that closes an end of the first flow path pipe when the pressure in the first flow path pipe is smaller than the pressure in the second flow path pipe, A lid portion (53) that is larger than the region surrounded by the inner periphery of the end portion of the first flow channel pipe and smaller than the region surrounded by the outer periphery of the end portion of the first flow channel tube, The flow path opening and closing device (1) according to claim 1. The flow path opening / closing mechanism has an opening / closing valve (15),
The on-off valve is
An attachment portion (15a) that is attached to an end portion of the first flow channel pipe and that is disposed inside a region surrounded by an outer periphery of the end portion of the first flow path tube;
A first lid portion (15b) extending from the attachment portion and blocking a part of the end portion of the first flow path pipe;
When the pressure in the first flow path pipe is lower than the pressure in the second flow path pipe, the part other than the part of the end portion of the first flow path pipe is swingable with respect to the first lid portion. A second lid (15d) disposed at a position to close the part,
The size of the first lid part (15b) and the second lid part (15d) is larger than the region surrounded by the inner periphery of the end part of the first flow path pipe and the end part of the first flow path pipe The channel opening / closing device (1) according to claim 1, wherein the channel opening / closing device (1) is smaller than a region surrounded by an outer periphery of the channel.   The flow path opening and closing device (2) according to claim 2 or 3, wherein the mounting portion (51, 15a) is attached to a notch (31) formed on an outer peripheral surface of the first flow path pipe. 1).   The flow path opening and closing device (1) according to claim 4, wherein the notch (31) is formed at a position corresponding to an upper portion of the outer peripheral surface of the first flow path pipe. The channel opening / closing mechanism (105)
A casing (151) provided with a flow path for communicating the flow path in the first flow path pipe and the flow path in the second flow path pipe;
It is provided in an unfixed state inside the flow path in the casing, and closes the end of the first flow path pipe when the pressure in the first flow path pipe is smaller than the pressure in the second flow path pipe. The flow path opening / closing device (100) according to claim 1, further comprising an opening / closing valve (152) arranged at a position.   The on-off valve (5, 152) does not block the end of the first flow path pipe when the pressure in the first flow path pipe is equal to or higher than the pressure in the second flow path pipe. The flow path opening and closing device (1, 100) according to any one of claims 2 to 6.   The flow path opening / closing apparatus (200) according to claim 1, wherein the flow path opening / closing mechanism includes an open / close valve (205) attached to the second flow path pipe (204). The on-off valve (205)
An attachment portion (251) attached to the inside of the second flow path pipe;
A first lid portion (252) extending from the attachment portion and blocking a part of the end portion of the first flow path pipe;
When the pressure in the first flow path pipe is lower than the pressure in the second flow path pipe, the part other than the part of the end portion of the first flow path pipe is swingable with respect to the first lid portion. A second lid portion (254) disposed at a position to close the portion,
The area of the first lid part and the second lid part is larger than the area surrounded by the inner periphery of the end part of the first flow path pipe and is surrounded by the outer periphery of the end part of the first flow path pipe The flow path opening and closing device (200) according to claim 8, characterized in that it is smaller.   A slit-shaped concave portion (204a) is provided on the inner peripheral surface of the second flow path pipe, and a slit-shaped convex portion (251a) inserted into the concave portion is provided on the outer peripheral surface of the mounting portion of the on-off valve. The flow path opening and closing device (200) according to claim 9, characterized in that   The flow path opening and closing device (200) according to claim 10, wherein a slit-shaped convex portion (203a) to be inserted into the concave portion is provided on an outer peripheral surface of the first flow channel pipe.

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