JP2014105500A - Drain valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain valve connected to the lower end of a drain pipe for discharging drain, which is piped from an indoor side to an outdoor side, and surely preventing odor from intruding along with ambient air into the indoor side through the drain pipe.SOLUTION: A drain valve has a body 1 including a valve chamber 2 as a center part, a drain inflow port 3 connected to a drain pipe at its upper end, and a drain outflow port 4 at its lower end. An upstream side on-off valve 10 and a downstream side on-off valve 20 are disposed in the valve chamber 2. Valve seats 14, 24 gently tilting downward from its forward end toward its rear end are formed at lower end opening edges of cylindrical water flow ports 13, 23 provided in the upper and lower on-off valves 10, 20, and tabular valve bodies 17, 27 pivotally connected in a vertically rotatable manner to forward end sides of the water flow ports 13, 23 are seated so as to be openable and closable. Thus, even when the valve bodies 17, 27 are opened in discharging the drain, the upper and lower on-off valves 10, 20 prevent odor from intruding along with ambient air into the upper drain pipe side.

Description

  The present invention relates to a drain valve that is connected to a drain pipe for discharging drain that flows out of an air conditioner such as an air conditioner or a refrigerator to the outside and prevents outside air, odors, etc. from entering the room from the outside. .

  If the drain that flows out of the air conditioner or refrigerator is discharged outside the room through a drain pipe such as a drain hose, the indoor and outdoor areas are in communication with each other through the drain pipe. In addition, when the ventilation fan is operated, there is a possibility that the indoor environment becomes negative pressure, and outside air, odor, etc. enter the room through the drain pipe and deteriorate the indoor environment.

  For this reason, for example, as described in Patent Document 1, a drain valve has been developed that can be connected to a drain pipe led to the outdoor side to prevent outside air and odor from entering the drain pipe. . This drain valve is provided with a space portion serving as a valve chamber in a main body in which an upper end opening is formed as an inlet and a lower end opening is formed as an outlet. A small-diameter cylindrical portion that is communicated and has a lower end opened obliquely downward toward the outlet, and a valve attachment opening is provided on the peripheral wall portion of the main body facing the oblique downward opening. It has a structure in which a lid member provided with a tongue-shaped elastic valve body for freely opening and closing the above-mentioned obliquely downward opening is detachably attached to the opening.

  Further, Patent Document 2 discloses a drain trap that is attached to an appropriate position of a drain pipe, and is inclined obliquely downward at an angle of 45 degrees to a lower end of a main body having an upper end opening formed at an inflow port. A slanting downward opening serving as an outlet for the drain is provided, and the base of the tongue-shaped valve body is pivotally mounted on the upward inclined end side of the opening and protrudes outward from the pivoting portion. A drainage trap having a structure in which a weight is attached to the base end of the valve body, the valve body is seated on the opening edge of the opening by the weight of the weight, and the opening is closed so as to be freely opened and closed.

Special opening 2006-322631 Japanese Utility Model Publication No. 63-23489

  According to the drain valve as described above, even if the ventilation fan is operated in a room where an air conditioner or a refrigerator / freezer is installed, negative pressure generated in the room due to the operation causes the valve body to be seated through the drain pipe. It acts as a suction force that actively sits on and prevents outside air and odors from entering the room through the drainpipe. A certain amount of drain stays in the valve chamber and the valve body rotates downward due to the weight of the drain to open the obliquely downward opening that is the drain outlet. When drainage is discharged, odor may enter the drainage pipe through the open part together with outside air from below the opening.

  In particular, in the drainage valve described above, when the inclination angle of the opening inclined obliquely downward is 45 degrees, the inclination is inclined at the same angle as the opening from the proximal end pivoting portion toward the distal end. Before the drain stays concentrated on the front side of the valve body and the drain stays up to the upper surface of the base end of the valve body, the valve body opens downward by the weight of the accumulated drain. Since the drain is discharged from the side, there occurs a gap in which the drain is not discharged on the base end side of the valve body, and an odor enters through the gap.

  Such problems can be solved if the drainage valve configured as described above is installed at two locations on the upstream and downstream sides of the drainage pipe, but not only the installation work takes time, There was a problem of high costs.

  Further, according to the former drain valve, when dust or foreign matter is accumulated or clogged in the main body, the valve mounting opening provided on the peripheral wall portion of the main body without removing the drain valve from the drain pipe. Since the valve body can be taken out by removing the lid member attached to the part, dust and foreign matters in the main body can be easily washed out and the valve body can be washed with water. While the valve seat is formed integrally with the lid member, the valve seat is formed by the mouth edge of the opening portion that is inclined downward and is provided in the main body. There is a problem in that the close contact state of the valve main body with respect to the valve seat changes, and there is a possibility that a gap is formed between the valve seat and the valve main body.

  The present invention has been made in view of such problems, and the object of the present invention is to reliably prevent the intrusion of odor by a simple structure and to smoothly discharge the drain. Remove the valve body from the main body integrally with the valve seat without removing it from the pipe, and clean the inside of the main body and wash the valve body, valve seat, etc. easily and reliably. It is an object of the present invention to provide a drain valve that can be easily mounted in a main body while being seated with a predetermined closing force.

  In order to achieve the above object, the drainage valve according to the present invention comprises a main body having an inlet and an outlet connected to the valve chamber at the upper and lower ends, respectively, with the valve chamber as the center. In the front portion of the valve chamber, a vertically long rectangular frame-shaped opening whose opening end is closed by a detachable lid is provided, and an upper end portion and an intermediate portion of the valve chamber having the frame-shaped opening An upper valve disposing groove and a lower valve disposing groove are provided on the inner wall surfaces on both sides, and an upstream on-off valve is disposed on the upper valve disposing groove, and a downstream side is disposed on the lower valve disposing groove. An on-off valve is attached, and these upstream-side on-off valve and downstream-side on-off valve are supported so that both end portions can be freely inserted into and removed from the above-mentioned valve disposing groove and communicate with the inflow and outflow ports. A partition plate portion having a hole, and an upper end connected to the outer peripheral edge of the lower surface of the water passage hole of the partition plate portion, and a lower end opening edge A short cylindrical water inlet formed in the valve seat inclined downward at a gentle angle of 30 degrees or less from the frame-shaped opening side toward the rear part of the valve chamber, and the front end part in front of the partition plate part A plate-like valve body that is supported on the lower surface of the unit so as to be pivotable up and down and is urged upward by a weight provided at a portion protruding forward from the front end portion and seated on the valve seat of the water passage It is characterized by comprising.

  In the drain valve configured as described above, the invention according to claim 2 is directed to the both sides of the lower surface of the front end portion of the partition plate portion in the upstream on-off valve and the downstream on-off valve from the front end toward the rear end. While projecting a pair of bearing pieces provided with an inclined groove portion inclined obliquely downward and having a front end opened forward and a rear end closed, both end portions are provided at the front end of the valve body. A shaft portion is provided which is fitted into the opposed inclined groove portions of the pair of bearing pieces from the front end opening portion and is engaged with the rear end portion of the inclined groove portion.

  Furthermore, the invention according to claim 3 is the drainage valve according to claim 2, wherein the through hole is provided in the center of the shaft portion provided at the front end of the valve body, while the rear end of the inclined groove portion of the both side bearing pieces. A locking hole that penetrates from the inclined groove portion to the outer surface of the bearing piece is provided, and both side end portions of the small-diameter shaft that is removably inserted into the through-hole of the shaft portion are engaged with the both-side locking holes. It is characterized by being.

  According to a fourth aspect of the present invention, a peripheral wall portion having a fixed height is projected over the entire circumference at the outer peripheral edge portion of the upper end of the water passage hole provided in the partition plate portion between the upstream side open / close valve and the downstream side open / close valve. The invention according to claim 5 is characterized in that the valve chamber center between the upstream side open / close valve and the downstream side open / close valve is provided on the lid that closes the frame-like opening of the valve chamber. A vent hole that allows the inside of the unit to communicate with the outside is provided.

  According to the first aspect of the present invention, the drain valve is provided with an upstream on-off valve and a downstream on-off valve in one valve chamber having a drain inlet at the upper end and a drain outlet at the lower end. As a result, the structure is simple and can be provided at low cost, and by simply connecting a single drainage valve to the appropriate location of the drainage pipe, two upper and lower on-off valves can be installed, facilitating installation work. It becomes.

  Further, the upstream side open / close valve and the downstream side open / close valve structure include a drain plate provided in the upper and lower ends of the main body, a partition plate portion having a water passage communicating with the outlet, and the partition plate portion described above. A short cylindrical water passage opening formed on a valve seat having an upper end connected to the outer peripheral edge of the lower surface of the water passage hole and having a lower end opening edge gently inclined obliquely downward from the front side toward the rear side; The front end portion is pivotally attached to the lower surface of the front portion of the partition plate portion so as to be pivotable up and down, and a weight is provided at a portion protruding forward from the front end portion, and is urged upward by the weight of the weight, so Therefore, when drain flows down from the inlet into the valve chamber of the valve body, it first stays on the valve body of the upstream on-off valve, and reaches a certain amount. Even if the drain of the valve stays and the valve body opens due to the weight of the drain, the valve body of the downstream on-off valve remains closed. Therefore, it is possible to reliably prevent odor from passing through the upstream on-off valve and entering the upstream side together with outside air, and when drain is discharged from the upstream on-off valve onto the downstream on-off valve. In addition, this time, even if the valve body of the upstream side opening / closing valve is closed and the downstream side opening / closing valve is opened, the upstream side opening / closing valve can reliably prevent the odor from entering the upstream side.

  Moreover, the lower end opening edge of the short cylindrical water inlet in the upstream side open / close valve and the downstream side open / close valve is inclined downward at a gentle angle of 30 degrees or less from the front side to the rear side of the valve chamber. Since the valve body is formed on the valve seat and the valve body is seated on this valve seat, a light weight is used so that when the small amount of drain is accumulated over the entire surface of the valve body, the valve body is opened downward. Therefore, even if the upstream and downstream valve bodies are opened due to the discharge of a large amount of drainage, there is a risk that odor will pass through the valve body with the outside air and enter the upstream side. It can be almost eliminated. Furthermore, it can form so that the height of the whole on-off valve may become low, and the length of a valve chamber can be shortened and a compact drain valve can be provided.

  Further, the opening end is closed by a detachable lid on the front part of the valve chamber in the main body in which the valve chamber is provided at the upper and lower ends of the valve chamber in the center and the inlet and the outlet communicating with the valve chamber are provided. A vertically rectangular frame-shaped opening is provided, and the upstream on-off valve disposition groove and the downstream on-off valve are formed on both inner wall surfaces of the upper and middle portions of the valve chamber having the frame-shaped opening. Are provided in the main body by inserting the partition plates in the upstream on-off valve and the downstream on-off valve into the disposing grooves during assembly. These upstream side open / close valves and the downstream side open / close valve can be easily arranged in one valve chamber, and when dust or foreign matter adheres to the product after long-term use, the lid can be removed without removing the main body from the drain pipe. Remove the body from these valve chambers upstream A valve closing and a downstream side switching valve can be easily removed, cleaned by washing with water and the body and these upstream side switching valve and the downstream side switching valve can be smoothly performed.

  Furthermore, since the valve body and the valve seat are integrally provided in the upstream and downstream on-off valves, it is of course possible to clean these valve body and valve seat at the same time, of course, They can be combined to achieve a predetermined opening / closing operation, and can be accurately opened / closed without causing drain leakage or odor intrusion.

  According to the invention of claim 2, the both sides of the lower surface of the front end portion of the partition plate portion in the upstream and downstream on-off valves are inclined obliquely downward from the front end toward the rear end, and the front end Is projecting a pair of bearing pieces provided with inclined groove portions that are open forward and closed at the rear end, while the opposite end portions of the valve body are inclined opposite to each other at the front end of the valve body. Since the shaft portion is formed by being inserted into the groove portion from the front end opening portion and locked to the rear end portion of the inclined groove portion, the upstream portion with respect to the partition plate portion having the drain water inlet provided with the valve seat at the lower end opening edge. The side open / close valve and the downstream open / close valve can be easily attached and detached, and can be disassembled and cleaned cleanly during cleaning by washing with water, etc., and can be easily and accurately assembled.

  According to the third aspect of the present invention, the through hole is provided at the center of the shaft portion provided at the front end of the valve body, and the outer surface of the bearing piece from the inclined groove portion to the rear end of the inclined groove portion of the both side bearing pieces. Since both side end portions of the small-diameter shaft that is removably inserted into the through hole of the shaft portion are engaged with the both side locking holes, the valve body is attached to the valve seat. It can be attached to the open / closed position accurately and without reluctance.

  According to the invention of claim 4, the peripheral wall portion having a constant height is projected over the entire circumference at the upper outer peripheral edge portion of the water flow hole provided in the partition plate portion of the upstream side open / close valve and the downstream side open / close valve. Therefore, it is possible to reliably prevent the drain from leaking to the valve drainage groove side supporting the partition plate portion.

  According to the fifth aspect of the present invention, the inside of the central portion of the valve chamber between the upstream side open / close valve and the downstream side open / close valve is communicated to the outside to the lid body that closes the frame-shaped opening of the valve chamber. Therefore, even if the negative pressure is generated on the indoor side due to the operation of the ventilation fan and the negative pressure acts on the valve chamber below the upstream on-off valve, Due to the negative pressure, outside air can be prevented from being drawn into the valve chamber between the upstream side open / close valve and the downstream side open / close valve through the vent hole, so that the negative pressure acts directly on the downstream side open / close valve. It is possible to suppress odor from entering the valve chamber between the upstream side open / close valve and the downstream side open / close valve from the downstream side.

The vertical side view of this invention drain valve. FIG. The perspective view which shows the state before arrange | positioning the upstream and downstream on-off valve in the main body. The perspective view which shows the state which has mounted | wore with the on-off valve in the main body. The perspective view of an on-off valve. FIG. 4 is a longitudinal side view of a state where drain is accumulated in an upstream side opening / closing valve. The vertical side view of the state which is discharging | emitting drain on a downstream opening-closing valve. The vertical side view of the state which has opened the downstream on-off valve and is discharging | emitting drain.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 4, the main body 1 is made of a transparent or translucent hard synthetic resin, and the valve chamber 2 is at the center. A cylindrical drain inlet 3 is provided at the upper end of the chamber 2 and a drain outlet 4 of the same size and shape as the drain inlet 3 is integrally provided at the lower end. 3 and 4, the front half is formed into a frame-shaped opening 2a having a vertically long rectangular shape in front view projecting forward from the front end of the rear half of the semi-cylindrical shape. The frame-shaped opening 2a is closed by a lid 5 that is detachable from the frame-shaped opening 2a. A vent hole 6 is formed in the upper part or the central part of the lid 5 to communicate the inside of the central part of the valve chamber 2 between the upstream side open / close valve and the downstream side open / close valve to the outside.

  Further, a pair of left and right upper valves for disposing an upstream on-off valve 10 and a downstream on-off valve 20 described later on the upper end portion and the middle portion in the length direction on the opposite inner wall surfaces of the valve chamber 2, respectively. Disposition grooves 7 and 7 and lower valve disposition grooves 8 and 8 are provided, respectively, and the rear end side of these valve disposition grooves 7 and 7 and 8 and 8 is a semi-cylinder of the valve chamber 2. The flat semicircular grooves 7a and 8a provided on the inner peripheral surface of the rear half of the shape are respectively continuous. These valve disposing grooves 7 and 8 may be provided in a horizontal shape, but in the figure, the valve disposing grooves 7 and 8 are moderately inclined by about 5 degrees from the front end toward the semicircular groove portions 7a and 8a at the rear end. It is inclined at an angle.

  The upstream side opening / closing valve 10 is formed so that both end portions thereof are removably supported by the upper valve disposing grooves 7 and 7 and a rear end portion thereof is removably supported by the semicircular groove portion 7a. A partition plate portion 11 whose outer peripheral edge is planar U-shaped, and a water passage drilled to communicate with the drain circulation port 3 in the rear half portion of the partition plate portion 11 located immediately below the drain inlet 3 The upper end of the hole 12 is continuously connected to the outer peripheral edge of the lower end of the water passage hole 12 on the lower surface of the partition plate 11, and the lower end opening edge is connected to the valve chamber 2 from the rear end side of the frame-shaped opening of the valve chamber 2. A short cylindrical water passage 13 formed in the valve seat 14 inclined downward at a gentle angle of 30 degrees or less toward the rear end side, and the front end portion on the lower surface of the front portion of the partition plate portion 11 A pair of bearing pieces 15 projecting downward on both side ends are supported by a pair of bearing pieces 15 and 15 so as to be vertically rotatable, and a weight 16 is provided at a portion protruding forward from the front end. And a plate-like valve body 17 that is urged upward by the weight of the weight 16 and is seated on the valve seat 14 and closes the water inlet 13.

  The downstream opening / closing valve 20 has the same structure as the upstream opening / closing valve 10, and both end portions thereof are detachably supported in the lower valve disposing grooves 8, 8 and the rear end portion is semicircular. The outer peripheral edge formed so as to be removably supported in the groove 7a is a plane U-shaped partition plate portion 21, the water outlet 13 of the upstream side opening / closing valve 10 and the drain outlet 4 In the latter half of the partition plate portion 21 positioned immediately above, the water passage hole 22 formed so as to communicate with the water flow port 13 and the drain outlet 4 on the same axis line, and the passage on the lower surface of the partition plate 21 are provided. The upper end is connected to the outer peripheral edge of the opening lower end of the water hole 22, and the lower end opening edge is 30 degrees or less as it goes from the rear end side of the frame-like opening of the valve chamber 2 toward the rear end side of the valve chamber 2. A short cylindrical water passage opening 23 formed in the valve seat 24 inclined downward at a gentle angle, and the front end portion below the both side end portions of the front lower surface of the partition plate portion 21. Is supported by a pair of bearing pieces 25 projecting toward the upper and lower portions, and a weight 26 is provided at a portion protruding forward from the front end portion, and is urged upward by the weight of the weight 26. A plate-shaped valve body 27 is seated on the valve seat 24 and closes the water passage 23.

  As shown in FIG. 5, the bearing pieces 15, 15 and 25, 25 projecting from the front lower surface of the partition plate portions 11, 21 in the upstream and downstream on-off valves 10, 20 are opposed to each other as shown in FIG. Are respectively provided with inclined grooves 15a, 15a and 25a, 25a which are inclined obliquely downward from the front end toward the rear end, the front end is opened forward and the rear end is closed. On the other hand, at the front ends of the valve bodies 17 and 27 in the upstream and downstream on-off valves 10 and 20, both end portions are inserted into the inclined groove portions 15a, 15a and 25a and 25a, respectively, and these inclined groove portions 15a, Shaft portions 17a and 27a that are pivotally locked to the rear end portions of 15a and 25a and 25a, respectively, are integrally provided, so that the valve elements 17 in the upstream and downstream on-off valves 10 and 20 are provided. 27 is pivotally attached to the bearing pieces 15, 15, 25, 25 so as to be rotatable in the vertical direction around the respective shaft portions 17a, 27a.

  Further, through-holes 17b and 27b are respectively provided in the central portions of the shaft portions 17a and 27a, and at the rear ends of the inclined groove portions 15a, 15a and 25a and 25a of the pair of bearing pieces 15, 15, and 25, 25. Locking holes 15b, 25b penetrating to the outside from these inclined groove portions 15a, 25a are formed, and both end portions of the shaft portions 17a, 27a are inserted into the rear ends of the inclined groove portions 15a, 25a and locked. In this case, the through holes 17b and 27b are communicated with the locking holes 15b and 25b, and the small diameter shafts 17c and 27c are inserted into the through holes 17b and 27b from the one locking hole 15b and 25b. The valve elements 17 and 27 are pivotally attached to the opening / closing positions of the valve seats 14 and 24 accurately and without pivoting by inserting and supporting the portions in the other locking holes 15b and 25b. Without using such shafts 17c and 27c, both end portions of the shaft portions 17a and 27a are rotatably supported at the rear ends of the inclined groove portions 15a and 25a provided in the bearing pieces 15 and 25, respectively. It may be.

  Further, the weights 16 and 26 project arm pieces 18 and 28 inclined obliquely downward toward the front from both front end sides of the valve bodies 17 and 27, respectively, and can be removed between the arm pieces 18 and 28. The shaft members 19 and 29 connected to each other are suspended and the weights of the weights 16 and 26 are changed so that the closing force of the valve bodies 17 and 27 can be adjusted. The shaft members 19 and 29 are cylindrical members, and the small-diameter shafts 19a and 29a are inserted into the center holes so that both end portions of the small-diameter shafts 19a and 29a are detachably supported by the arm pieces 18 and 28. However, the weights 16 and 26 may be detachably attached to the arm pieces 18 and 28 without using the small-diameter shafts 19a and 29a.

  The upper and outer peripheral edges of the water holes 12 and 22 provided in the partition plates 11 and 21 of the upstream side open / close valve 10 and the downstream side open / close valve 20 have a certain height surrounding the water holes 12 and 22. Ring-shaped peripheral wall portions 11a and 21a are projected, and outer peripheral wall portions 11b and 21b having the same height as the peripheral wall portions 11a and 21a are also projected on the outer peripheral edge of the upper surface of the partitioned portions 11 and 21. Yes, the upper end surfaces of the peripheral wall portions 11a and 21a and the outer peripheral wall portions 11b and 21b are directed downward from the upper valve disposing groove 7 and the lower valve disposing groove 8 facing the upper end surfaces, respectively. It is slidably in close contact with the inner wall surface of the groove.

  As described above, the main body 1, the lid body 5 that closes the frame-shaped opening 2 a of the valve chamber 2 provided in the main body 1, and the upstream side open / close valve 10 and the downstream side open / close valve 20 are formed separately. In addition, the valve seat side and the valve body side constituting the upstream side and downstream side on-off valves 10 and 20 are also formed separately, and the water flow ports in the upstream and downstream on-off valves 10 and 20 are formed. The valve bodies 17 and 27 are attached to the partition plate portions 11 and 21 having 12 and 22 as described above, and the weights 16 and 26 are attached to the valve bodies 17 and 27 so that the upstream and downstream on-off valves 10 and 20 are provided. After assembling, the upstream side opening / closing valve 10 and the downstream side opening / closing valve 20 are connected to the upper side of the valve chamber 2 of the main body 1 through the frame-shaped opening 2a of the valve chamber 2 as shown in FIGS. The partition plate portions 11 and 21 are inserted and inserted into the valve disposing groove 7 and the lower valve disposing groove 8 respectively, and then the lid 5 is mounted on the frame-shaped opening 2a. To complete the assembly of the drain valve.

  The drain valve configured as described above is provided at the upper end of the main body 1 as shown in FIG. 6 at the lower end of the drain pipe A which is led out from the room to the outside and is suspended along the outer wall surface of the building. A drain inlet 3 is connected, and if necessary, a drain pipe A ′ that faces a drainage tub or the like is connected to a drain outlet 4 provided at the lower end of the main body 1. In addition, the upper end part of the drain pipe A is connected to the drain outlet of the air conditioner and refrigerator-freezer which are arrange | positioned indoors.

  In such a use state, when the drain generated by the operation of the air conditioner or the refrigerator is discharged to the outside through the drain pipe A, the drain flows down through the drain pipe A and passes through the drain inlet 3 of the drain valve body 1. The water flows down from the water flow hole 12 of the upstream opening / closing valve 10 disposed in the upper portion of the valve chamber 2 into the water flow port 13 and stays on the valve body 17.

  Since the valve body 17 is inclined at a gentle angle of 30 degrees or less from the front end side pivoted in the vertical direction by the bearing pieces 15, 15 toward the rear end, a small amount of drain makes this The entire upper surface of the valve body 17 is below the water surface as shown in FIG. 6, and when the drain stays in the water inlet 13 to a certain height in this state, the valve body 17 resists the weight of the weight 16. Since the weight of the weight 16 is set so as to open downward, when the valve body 17 opens downward, the drain is discharged downward from the entire open gap between the valve body 17 and the valve seat 14, As shown in FIG. 7, the water flows through the water passage 23 from the water passage hole 22 of the downstream on-off valve 20 disposed in the intermediate portion in the valve chamber 2 and stays on the lower valve body 27.

  The lower valve body 27 is also configured to be opened when the drain stays on the entire upper surface of the valve body 27 until reaching a certain height, and the drain flows from the lower valve body 27 by the opening. It is discharged to the outside through the outlet 4.

  When a large amount of drainage is introduced into the main body 1 through the drain pipe A, the valve body 17 of the upstream side opening / closing valve 10 and the valve body 27 of the downstream side opening / closing valve 20 are both maintained open. Drain is discharged to the outside through the outlet 4, but when discharged from a small amount of drainage drain pipe A side, the upper valve body 17 is opened and a certain amount of drain is discharged onto the lower valve body 27. As shown in FIG. 8, the upper valve body 17 closes while the lower valve body 27 is opened by a certain amount of accumulated drain on the lower valve body 27, and the lower valve body 27 is opened. Drain is discharged to the outside through the outlet 4. In any drain discharge state, even if odor enters the outflow port 4 together with outside air, it can be prevented from entering the upstream pipe A by the upstream and downstream on-off valves 10 and 20. .

  Furthermore, a negative pressure is generated on the indoor side by the operation of a ventilation fan, and the negative pressure acts on the drain inlet 3 side of the drain valve body 1 through the drain pipe A, and the valve body 17 and the valve seat of the upstream on-off valve 10. Even if an intake force due to the negative pressure is generated in the central portion of the valve chamber between the upstream side open / close valve 10 and the downstream side open / close valve 20 through a small gap with the valve 14, the frame-shaped opening 2a of the valve chamber 2 is closed. The lid 5 is formed with a vent hole 6 that allows the inside of the valve chamber to communicate with the outside, so that outside air is sucked into the center of the valve chamber through the vent hole 6 by the intake force. It is possible to prevent the negative pressure from acting directly on the downstream on-off valve 20, and accordingly, odor from the downstream side enters the valve chamber 2 between the upstream on-off valve 10 and the downstream on-off valve 20. Intrusion can be suppressed.

  In addition, if the drainage valve becomes dirty due to dust or foreign matter mixed in the drain due to long-term use or dust or foreign matter adheres to the valve body 17, 27, etc., it can not operate smoothly. Without removing the main body 1 of the drain valve from the drain pipe A, by removing the lid body 5 that seals the frame-like opening 2a of the valve chamber 2, the on-off valves 10 on the upstream side and the downstream side from the inside of the valve chamber 2, 20 can be taken out, and foreign substances adhering to these on-off valves 10 and 20 can be removed or cleaned by washing or the like, and the inside of the main body 1 can be cleaned by washing or the like through the frame-like opening 2a. .

1 Body 2 Valve chamber
2a Frame-shaped opening 3 Drain inlet 4 Drain outlet 5 Lid 6 Ventilation hole 7 Upper valve disposition groove 8 Lower valve disposition groove
10, 20 Open / close valve
11, 21 Partition part
12, 22 Water vent
13, 23 Water outlet
14, 24 Valve seat
15, 25 Bearing piece
16, 26 spindles
17, 27 Disc

Claims (5)

  A vertically long rectangle whose opening end is closed by a detachable lid at the front part of the valve chamber in the main body in which the valve chamber is in the center and the inlet and outlet ports communicating with the valve chamber are provided at the upper and lower ends, respectively. And the upper valve disposing groove and the lower valve disposing groove on the inner wall surfaces on both sides of the upper end portion and the intermediate portion of the valve chamber having the frame opening portion, respectively. An upstream on-off valve is attached to the upper valve disposing groove, and a downstream on-off valve is attached to the lower valve disposing groove. A partition plate portion that is removably supported in the valve disposing groove and has a water passage hole communicating with the inflow and outflow ports, and an upper end on the outer periphery of the lower surface of the water passage hole of the partition plate portion. And the lower end opening edge at a gentle angle of 30 degrees or less from the frame-shaped opening side toward the rear of the valve chamber. A short cylindrical water passage formed in the valve seat inclined downward, and the front end portion is supported on the lower surface of the front portion of the partition plate portion so as to be rotatable up and down, and protrudes forward from the front end portion. A drainage valve comprising: a plate-like valve body that is urged upward by a weight provided in a portion and is seated on the valve seat of the water passage.   The upstream side opening / closing valve and the downstream side opening / closing valve are inclined diagonally downward from the front end to the rear end of the front end portion of the partition plate portion, and the front end is open forward and rearward. A pair of bearing pieces provided with inclined groove portions whose ends are closed are projected, and both end portions are inserted into the opposed inclined groove portions of the pair of bearing pieces from the front end opening portion at the front end of the valve body. The drain valve according to claim 1, further comprising a shaft body portion that is engaged with a rear end portion of the inclined groove portion.   A through hole is provided at the center of the shaft body portion provided at the front end of the valve body, while a locking hole is provided at the rear end of the inclined groove portion of both side bearing pieces from the inclined groove portion to the outer surface of the bearing piece. The drainage valve according to claim 2, wherein both side end portions of a small-diameter shaft that is removably inserted into the through hole of the shaft body portion are engaged with the both side locking holes.   The peripheral wall portion having a constant height is provided over the entire circumference on the outer peripheral edge of the upper end of the water passage hole provided in the partition plate portion between the upstream side open / close valve and the downstream side open / close valve. The drain valve according to 1.   The lid that closes the frame-shaped opening of the valve chamber is provided with a vent hole that communicates the inside of the valve chamber between the upstream on-off valve and the downstream on-off valve to the outside. The drainage valve according to claim 1.

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