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JP-2026075298-A - automatic drainage device

JP2026075298AJP 2026075298 AJP2026075298 AJP 2026075298AJP-2026075298-A

Abstract

[Problem] To stabilize the operation by suppressing vibration of the arm during the process of the valve body moving from the open position to the closed position. [Solution] The device comprises a main body 10 that closes the opening 6a of the pipe body 6, an outlet portion 20 provided on the lower side of the main body 10, a valve body 30 having a contact surface 31 that contacts the valve seat 21 of the outlet portion 20 and that can be moved to a closed position X and an open position Y, an arm 40 having the valve body 30 attached to its tip portion 41 and its base portion 42 rotatable around a pivot axis Q, and a weight 80 that biases the rotation of the arm 40 so that the valve body 30 moves toward the open position Y by its own weight. A suppression member 70 is provided on the outlet portion 20 side of the contact surface 31 of the valve body 30, which narrows the gap between the lower edge 31a side of the contact surface 31 of the valve body 30 and the valve seat 21 of the outlet portion 20 in the process of the valve body 30 moving from the open position Y to the closed position X, thereby suppressing the flow of water. [Selection Diagram] Figure 5

Inventors

  • ▲高▼谷 啓介

Assignees

  • 株式会社ベン

Dates

Publication Date
20260508
Application Date
20241022

Claims (11)

  1. An automatic drainage device comprising: a main body that closes the opening of a pipe through which water flows; an outlet portion provided below the main body and having an annular valve seat on the pipe side, capable of discharging water from the pipe; a valve body having an annular contact surface that contacts the valve seat of the outlet portion, and being movable to a closed position that closes the outlet portion by making contact with the contact surface, and to an open position separated from the closed position; an arm with the valve body at its tip and its base end provided above the main body so as to be rotatable about a pivot axis along a direction perpendicular to the axial direction of the outlet portion; and a weight provided on the base end side of the arm that biases the rotation of the arm so that the valve body moves toward the open position by its own weight, wherein when the water pressure inside the pipe is below a predetermined pressure, the biasing force of the weight rotates the arm to position the valve body in the open position, and when the water pressure inside the pipe exceeds the predetermined pressure, the arm rotates against the biasing force of the weight to position the valve body in the closed position, An automatic drainage device characterized by having a suppression member provided on the discharge port side of the contact surface of the valve body, which narrows the gap between the lower edge of the contact surface of the valve body and the valve seat of the discharge port as the valve body moves from the open position to the closed position, thereby suppressing the flow of water.
  2. The automatic drainage device according to claim 1, characterized in that a protrusion is provided at the center of the valve body on the outlet side, and the suppression member is provided on the protrusion.
  3. The automatic drainage device according to claim 2, characterized in that the suppression member is formed from a plate having a center point on a central axis passing through the center point of the circumference of the contact surface of the valve body, and having an arc with a radius smaller than the radius of the circumference of the contact surface.
  4. The valve body is constructed comprising a ring-shaped plate packing having a contact surface that contacts the valve seat and a first bolt insertion hole in the center, and a support plate that supports the packing and has a second bolt insertion hole in the center, with a third bolt insertion hole formed at the tip of the arm, and a fastening bolt having a bolt head and a shaft portion with a male thread formed thereon that constitutes the protruding portion, and a mounting female thread formed on the bolt head so that a mounting bolt can be screwed along the axis of the shaft portion, and a support plate that supports the packing on the discharge port side of the tip of the arm The automatic drainage device according to claim 2, characterized in that a valve body made of the above is attached, the shaft portion of the fastening bolt is inserted through the first to third bolt insertion holes from the discharge port side, a fastening nut is screwed onto the male thread of the shaft portion from the pipe side of the tip of the arm to fasten the valve body to the arm, the suppressing member is formed having a mounting bolt insertion hole through which the mounting bolt can be inserted, the suppressing member is attached to the bolt head of the fastening bolt, the mounting bolt is inserted through the mounting bolt insertion hole and screwed onto the mounting female thread, and the suppressing member is provided on the valve body.
  5. The above-mentioned arm is positioned on the pipe side relative to the above-mentioned main body, and a shaft body with the pivot center axis as its axis is provided at the base end of the arm so as not to rotate relative to the arm. On the upper side of the main body, a bulge is formed that has a recess facing the base end of the arm and bulges out on the opposite side from the tubular body, and coaxial shaft holes are provided in the left and right walls constituting the bulge, through which the shaft body is rotatably inserted. The base end of the above-mentioned arm is positioned facing the recess of the bulge, and the shaft is inserted into the shaft hole of the bulge, thereby attaching the arm to the main body. The automatic drainage device according to claim 1, characterized in that the weight is placed on the opposite side of the main body from the pipe, and the weight is connected to both ends of the shaft via connecting members.
  6. The main body is formed having a bottom and a cylindrical portion connected to the bottom and insertable into the interior through the opening of the pipe, a main body flange is formed on the outer circumference of the cylindrical portion facing the opening edge of the pipe, the bulging portion is formed on the upper side of the bottom of the main body, and the discharge port is provided on the lower side of the bottom, The automatic drainage device according to claim 5, characterized in that the pipe body is provided with an outward-facing pipe body flange on the outside of its opening, the cylindrical portion of the main body is inserted into the pipe body through the opening, a ring-shaped elastic packing is interposed between the main body flange and the opening edge of the pipe body, a perforated loose flange is used that faces the pipe body flange and the side of the main body flange opposite to the pipe body, and the main body is attached to the pipe body by attaching the loose flange to the pipe body flange with bolts and nuts, thereby clamping the pipe body flange between the loose flange and the pipe body flange via the elastic packing.
  7. The automatic drainage device according to any one of claims 1 to 3, characterized in that the valve body is made movable to an open position with a greater degree of opening than the open position of the valve body by the rotation of the arm, a biasing means is provided that biases the weight relative to the main body so that the valve body moves from the open position to the open position and holds the valve body in the open position by the biasing force, and a pressing portion is formed protruding from the upper side of the weight, capable of pressing downward against the biasing force of the biasing means to position the valve body in the open position.
  8. The valve body is made movable to an open position with a greater degree of opening than the open position by the rotation of the arm, a biasing means is provided that biases the weight relative to the main body so that the valve body moves from the open position toward the open position and holds the valve body in the open position by that biasing force, and a pressing portion is formed protruding from the upper side of the weight, which can be pressed downward against the biasing force of the biasing means to position the valve body in the open position, The automatic drainage device according to claim 5 or 6, characterized in that the biasing means is composed of a pair of coil springs, each wound around both ends of the shaft, with one end locked to the main body and the other end locked to the weight.
  9. The automatic drainage device according to claim 8, characterized in that the main body is provided with a cover that covers the weight, the cover having an outlet formed on the lower side allowing water to flow out from the drain port, and a pressing opening formed on the upper side through which the pressing portion of the weight protrudes, and the cover is provided with a cap made of an elastic sheet that covers the pressing opening and the pressing portion protruding from it in a way that allows the pressing portion to be pressed.
  10. The automatic drainage device according to any one of claims 1 to 3, characterized in that the above weight is formed to allow for the attachment of multiple weights for weight adjustment.
  11. The automatic drainage device according to any one of claims 1 to 3, characterized in that the above-mentioned discharge port is constructed as a cylindrical body that can be attached to or detached from the lower side of the main body by a screw mechanism, and the end face of the cylindrical body on the pipe side is configured as a valve seat.

Description

This invention relates to an automatic drainage device connected to a pipe through which water flows. It automatically drains the water from the pipe by closing the outlet when the internal water pressure exceeds a predetermined pressure and opening the outlet when the water pressure falls below the predetermined pressure. Generally, as shown in Figure 8, elevated bridges used by vehicles such as trains and automobiles, especially in cold regions, are equipped with a snow-melting system S to remove snow accumulating on them. This snow-melting system S comprises a storage tank 1 for storing water for snow melting, a main pipe 3 through which the water stored in the storage tank 1 is pumped up and flowed by a pump 2, and numerous pipe bodies 6 branching off from the main pipe 3, each equipped with an on/off valve 4 and a pressure reducing valve 5, as well as multiple sprinkler nozzles N. The end of each pipe body 6 is lower than the beginning, and an automatic drainage device is provided at the end to automatically drain the water from the pipe body 6 when the pump 2 is not operating, preventing the water inside the pipe body 6 from freezing. Conventionally, as shown in Figure 9, for example, an automatic drainage device Ka described in Patent Document 1 (Japanese Utility Model Publication No. 1-36979) is known. This automatic drainage device Ka comprises a main body 200 that closes the opening 6a of a pipe 6 through which water flows; an outlet portion 202 provided below the main body 200 and having an annular valve seat 201 on the pipe 6 side that can discharge water from the pipe 6; a valve body 204 having an annular contact surface 203 that contacts the valve seat 201 of the outlet portion 202 and being movable to a closed position X that closes the outlet portion 202 by making contact with this contact surface 203 and an open position Y that is spaced apart from the closed position X; an arm 205 with the valve body 204 at its tip and its base end provided on the upper side of the main body 200 so as to be rotatable about a pivot axis Q that is perpendicular to the axis P of the outlet portion 202; and a weight 206 provided on the base end side of the arm 205 that biases the rotation of the arm 205 so that the valve body 204 moves toward the open position Y by its own weight. Reference numeral 207 denotes a removable stop pin that supports the weight 206 in the open position Y of the valve body Y, thereby stopping the rotation of the arm 205 in order to hold the valve body 204 in the open position Y. Then, when the snow melting system S is activated to melt the snow, pump 2 is activated. This causes water to flow from pump 2 into the pipe 6 and the automatic drainage device Ka. Although some water is drained from the outlet 202, the pipe 6 gradually fills with water. When the water pressure inside the pipe 6 exceeds a predetermined pressure, the arm 205 rotates against the biasing force of the weight 206, and the valve body 204 is positioned in the closed position X. In this state, the pressure inside the pipe 6 increases, and water is sprayed from the sprinkler nozzles N connected to the pipe 6. On the other hand, when snow melting is complete, pump 2 is stopped. This causes water to be released from nozzle N, reducing the water pressure inside pipe 6. When the water pressure inside pipe 6 falls below a predetermined pressure, the biasing force of weight 206 causes arm 205 to rotate, positioning valve body 204 in the open position Y. In this state, water flows out of pipe 6 through outlet 202, emptying pipe 6. As a result, the freezing of water inside pipe 6 is prevented. Furthermore, if foreign matter becomes lodged between the valve body 204 and the outlet 202 during drainage, removing the stop pin 207 will cause the arm 205 to rotate further due to the weight of the weight 206, increasing the opening of the outlet 202 and allowing the foreign matter to be discharged. Afterward, the protruding portion 208 on the upper part of the weight 206 can be manually lifted and the stop pin 207 inserted to reset the system. Publication No. 1-36979 This is a side cross-sectional view showing an automatic drainage device according to an embodiment of the present invention in the closed position of the valve body.This is an exploded perspective view showing an automatic drainage device according to an embodiment of the present invention.This is a front view showing an automatic drainage device according to an embodiment of the present invention, with the cover and weight removed.This is a cross-sectional view taken along line A-A in Figure 1, showing an automatic drainage device according to an embodiment of the present invention.This is a side cross-sectional view of an automatic drainage device according to an embodiment of the present invention, showing the valve body in the open position.This is a side cross-sectional view of an automatic drainage device according to an embodiment of the present invention, showi