JP2008285845A - Lid with excessive internal pressure release valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid with an excessive internal pressure release valve in which a trough lid and a manhole lid arranged on the ground are not easily removed due to external factors such as wind pressure, strong wind and water pressure.
A lid with an excessive internal pressure release valve includes a lid 1 arranged on the ground and an excessive internal pressure release valve 10 constructed on a part of the lid 1, the lid 1 having an annular step 2. And a circular opening 3 on the center side of the annular step 2, and the excessive internal pressure release valve 10 has an annular lower valve member 11 having an opening 11A, a disc-shaped upper valve member 12, and the annular It has a lower valve member 11 and a rod-shaped member 13 that connects the disk-shaped upper valve member 12, and the excessive internal pressure release valve 10 is provided with return means that returns to its original state due to the disappearance of external factors.
[Selection] Figure 1

Description

  The present invention relates to a lid with an excessive internal pressure release valve, and more particularly to a trough lid or a manhole lid where the lid may be blown by a differential pressure between the inside and the outside of the lid.

  Conventionally, as shown in FIG. 11 and FIG. 12, concrete U-shaped side grooves called troughs are installed along the railroad tracks in order to accommodate and protect various wirings such as power cables and signal cables. FIG. 11 shows a state where the trough is closed, and FIG. 12 shows a state where the trough is open.

  Normally, the trough is not exposed, and the upper surface of the trough is covered with a concrete lid so that dirt, animals, etc. do not enter the trough, and as a passage when traveling along the line. However, in consideration of workability such as inspection and wiring replacement in the trough, the trough lid is divided and installed so that it can be removed and attached manually.

  Currently, lids for U-shaped side grooves along railroad tracks have been proposed that are lightweight when transported, adjusted to a weight that will not move and move away when the train passes after installation, and that do not cause cracks or cracks ( Patent Document 1).

A ball check valve and a drainage control device using the ball check valve have been proposed (see Patent Document 2).
JP-A-9-312922 JP 2005-98493 A

  The above-mentioned trough lid may come off due to external factors such as wind pressure and pressure changes caused by high-speed train passing in the vicinity of the trough, and weather (strong wind caused by typhoons).

  FIG. 13 is a diagram illustrating an actual measurement example of the differential pressure obtained from the pressure change acting on the upper and lower surfaces of the trough lid.

  As the train 101 passes in the vicinity of the trough, a differential pressure as shown in FIG. 13 is instantaneously generated on the upper and lower surfaces of the trough lid. In particular, in this example, when the rear side of the train passes, there is a large force in the direction of raising the trough lid (the differential pressure is positive).

  On the other hand, the lid counters the force that rises due to its own weight. That is, the limit differential pressure ΔP at which the lid is lifted is obtained as follows.

ΔP> Mg / S = 13 × 9.8 / 0.125≈1 (kPa)
However, M is the mass of the lid, g is the acceleration of gravity, S is the surface area of the lid, and the actual value varies depending on the conditions of the lid.

  From the above formula, in the example of the lid shown in FIG. 13, it is estimated that the lid is lifted by a differential pressure of 1 kPa or more generated when the train passes the tail, and it is also referred to as a lid at the place where it is actually scattered.

  In addition, the manhole cover laid on the road may come off due to the air pressure caused by the water flow that suddenly flowed into the drainage channel during heavy rain or the overflowing water pressure.

  In view of the above situation, the present invention provides a lid with an excessive internal pressure release valve in which a trough lid or manhole lid placed on the ground is not easily removed due to external factors such as wind pressure, strong wind, and water pressure. For the purpose.

In order to achieve the above object, the present invention provides
[1] A lid with an excessive internal pressure release valve is provided with a lid arranged on the ground and an excessive internal pressure release valve constructed at a part of the lid, and the lid has an annular step portion and the annular step. A circular opening on the center side of the part, and the excessive internal pressure release valve has an annular lower valve member having an opening, a disk-shaped upper valve member, the annular lower valve member, and the disk-shaped upper valve member. And the excessive internal pressure release valve has a return means that returns to its original state when extrinsic factors are extinguished.

  [2] The lid with an excessive internal pressure release valve according to [1], wherein the return means is a dead weight of the excessive internal pressure release valve.

  [3] In the lid with an excessive internal pressure release valve according to [1], the return means is an elastic body disposed between the lower surface of the annular step portion of the lid and the surface of the annular lower valve member. It is characterized by being.

  [4] The lid with an excessive internal pressure release valve according to [1] above, wherein an annular washer is disposed on the lower surface of the annular step portion of the lid, and the annular washer and the surface of the annular lower valve member A coil spring is disposed between the two.

  [5] The lid with an excessive internal pressure release valve according to any one of [1] to [4], wherein the rod-shaped member is a rod-shaped member having at least an outer surface subjected to a lubrication treatment.

  [6] The lid with an excessive internal pressure release valve according to [5], wherein the lubricating treatment is a Teflon (registered trademark) treatment.

  According to the present invention, there is provided a lid with an excessive internal pressure release valve in which a trough lid and a manhole lid arranged on the ground are not easily removed due to external factors such as wind pressure, weather, and water pressure. In particular, even if the excessive internal pressure release valve is in an open state, it can be automatically restored to the original state when the external factor that causes the excessive internal pressure release valve to disappear is safe.

  The lid with an excessive internal pressure release valve of the present invention includes a lid disposed on the ground and an excessive internal pressure release valve constructed in a part of the lid, and the lid is formed with an annular step portion and the annular step. A circular opening on the center side of the part, and the excessive internal pressure release valve has an annular lower valve member having an opening, a disk-shaped upper valve member, the annular lower valve member, and the disk-shaped upper valve member. The excessive internal pressure release valve includes a return means that returns to its original state when extrinsic factors are extinguished.

  Hereinafter, embodiments of the present invention will be described in detail.

  1 is a perspective view of a lid with an excessive internal pressure release valve showing a first embodiment of the present invention, FIG. 2 is a diagram showing a state in which the excessive internal pressure release valve of the lid with an excessive internal pressure release valve is closed, and FIG. FIG. 4 is a perspective view of the excessive internal pressure release valve, showing a state where the excessive internal pressure release valve of the lid with the excessive internal pressure release valve is lifted and opened.

  In these drawings, reference numeral 1 denotes a lid, which is formed with an annular step portion 2 and a circular opening 3 of the lid inside.

  On the other hand, as shown in FIG. 4, an excessive internal pressure release valve 10 is provided so as to correspond to the annular step portion 2 of the lid 1 and the circular opening 3 inside thereof. The excessive internal pressure release valve 10 has an opening 11A, an annular lower valve member (heavy metal member or concrete member) 11, a disk-shaped upper valve member (heavy metal member or concrete member) 12, and a circular shape. It is comprised from the rod-shaped member 13 which connects the cyclic | annular lower valve member 11 and the disk shaped upper valve member 12. FIG.

  Therefore, as shown in FIG. 2, the circular lower portion 12 </ b> A of the upper valve member 12 of the excessive internal pressure release valve 10 is normally engaged with the annular step portion 2 of the lid 1. 3 is closed by the upper valve member 12 of the excessive internal pressure release valve 10.

  On the other hand, when the excessive internal pressure release valve 10 rises due to an external factor, the excessive internal pressure release valve 10 is pushed up as shown in FIG. Then, the upper circumferential portion 11 of the annular lower valve member 11 of the excessive internal pressure release valve 10 abuts on the lower circumferential portion 1A of the circular opening 3 of the lid 1, and the excessive internal pressure release valve 10 moves further outside. Never do.

  When the external factor acting on the excessive internal pressure release valve 10 is released, the excessive internal pressure release valve 10 can be returned to the original state as shown in FIG.

  In this way, the structure is simple, and the excessive internal pressure release valve that is normally disposed on the lid is closed, so that no dust, animals or the like enter.

  5 is a perspective view of a lid with an excessive internal pressure release valve showing a second embodiment of the present invention, FIG. 6 is a diagram showing a state in which the excessive internal pressure release valve of the lid with an excessive internal pressure release valve is closed, and FIG. It is a figure which shows the state which the excessive internal pressure release valve of a lid | cover with an excessive internal pressure release valve raises and opens.

  As shown in these drawings, an excessive internal pressure release valve 30 is provided so as to correspond to an annular step portion 22 of the lid 21 and a circular opening 23 of the lid. The excessive internal pressure release valve 30 includes an annular lower valve member 31 having an opening 31A, a disc-like upper valve member 32, and a rod-like member having surface lubricity that connects the annular lower valve member 31 and the disc-like upper valve member 32. 33. As the rod-shaped member 33 having surface lubricity, for example, a Teflon (registered trademark) rod-shaped member can be used.

  Alternatively, a Teflon (registered trademark) tube may be attached to the metal rod.

  FIG. 8 is a perspective view of a lid with an excessive internal pressure release valve showing a third embodiment of the present invention, FIG. 9 is a view showing a state in which the excessive internal pressure release valve of the lid with an excessive internal pressure release valve is closed, and FIG. It is a figure which shows the state which the excessive internal pressure release valve of a lid | cover with an excessive internal pressure release valve raises and opens.

  As shown in these drawings, an excessive internal pressure release valve 50 is provided so as to correspond to an annular step portion 42 of the lid 41 and a circular opening 43 of the lid. The excessive internal pressure release valve 50 includes an annular lower valve member 51 having an opening 51A, a disc-like upper valve member 52, and a rod-like member 53 that connects the annular lower valve member 51 and the disc-like upper valve member 52. An annular washer 54 and a coil spring 55 pass through the lower part of the rod-like member 53.

  Therefore, as shown in FIG. 9, normally, the circular lower portion 52 </ b> A of the upper valve member 52 of the excessive internal pressure release valve 50 is engaged with the annular step portion 42 of the lid 41, and the circular opening of the lid 41 is engaged. 43 is closed by a disk-shaped upper valve member 52 of the excessive internal pressure release valve 50.

  On the other hand, when the excessive internal pressure release valve 50 rises due to an external factor, the excessive internal pressure release valve 50 is pushed up as shown in FIG. Then, the annular washer 54 and the coil spring 55 penetrate the rod-shaped member 53 of the annular lower valve member 51 of the excessive internal pressure release valve 50, and the lid 41 has a circular shape with the coil spring 55 being compressed. The excessive internal pressure release valve 50 does not move further beyond the lower circumferential portion 41 </ b> A of the opening 43.

  When the external factor acting on the excessive internal pressure release valve 50 is released, the annular lower valve member 51 is returned to the original state by the downward pressure of the annular lower valve member 51 by the release force from the compression of the coil spring 55.

  According to this embodiment, in addition to the excessive weight of the excessive internal pressure release valve 50, the excessive internal pressure release valve 50 can be quickly and accurately returned by the releasing force of the coil spring 55 from the compressed state.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The lid with an excessive internal pressure release valve of the present invention can be used as a lid with an excessive internal pressure release valve that can be automatically returned to the original position without being blown by an external condition.

It is a perspective view of a lid with an excessive internal pressure release valve showing a first embodiment of the present invention. It is a figure which shows the state with the excessive internal pressure release valve of the lid | cover with an excessive internal pressure release valve which shows 1st Example of this invention being closed. It is a figure which shows the state which the excessive internal pressure release valve of the lid | cover with an excessive internal pressure release valve which shows 1st Example of this invention raises and opens. It is a perspective view of the excessive internal pressure release valve which shows 1st Example of this invention. It is a perspective view of the lid | cover with an excessive internal pressure release valve which shows 2nd Example of this invention. It is a figure which shows the state by which the excessive internal pressure release valve of the lid | cover with an excessive internal pressure release valve which shows 2nd Example of this invention is closed. It is a figure which shows the state which the excessive internal pressure release valve of the lid | cover with an excessive internal pressure release valve which shows 2nd Example of this invention raises and opens. It is a perspective view of the lid | cover with an excessive internal pressure release valve which shows 3rd Example of this invention. It is a figure which shows the state in which the excessive internal pressure release valve of the lid | cover with an excessive internal pressure release valve which shows 3rd Example of this invention is closed. It is a figure which shows the state which the excessive internal pressure release valve of the lid | cover with an excessive internal pressure release valve which shows 3rd Example of this invention raises and opens. It is a figure showing the state where the conventional trough is closed. It is a figure which shows the state which the conventional trough is open. It is a figure which shows the measurement example of the differential pressure which acts on the upper and lower surfaces of the conventional trough lid.

Explanation of symbols

1, 21, 41 Lid 2, 22, 42 Annular step 3, 23, 43, 52 Circular opening 10, 30, 50 Overpressure release valve 11, 31, 51 Annular lower valve member 11A, 31A , 51A Opening of the annular lower valve member 12, 32, 52 Disc-shaped upper valve member 13, 33, 53 Rod member 33 Rod member [Teflon (registered trademark) rod member]
41A Lower circumferential portion 54 Annular washer 55 Coil spring 52A Lower circumferential portion of the upper valve member

Claims (6)

(A) a lid disposed on the ground;
(B) an excessive internal pressure release valve constructed in a part of the lid;
(C) The lid includes an annular step portion and a circular opening at the center of the annular step portion, and the excessive internal pressure release valve has an annular lower valve member having an opening, and a disc-shaped upper valve member. And a rod-shaped member that connects the annular lower valve member and the disk-shaped upper valve member, and the excessive internal pressure release valve includes a return means that returns to its original state due to disappearance of an external factor. Lid with excessive internal pressure release valve. 2. The lid with an excessive internal pressure release valve according to claim 1, wherein the return means is the weight of the excessive internal pressure release valve. 2. The lid with an excessive internal pressure release valve according to claim 1, wherein the return means is an elastic body disposed between the lower surface of the annular step portion of the lid and the surface of the annular lower valve member. A lid with an excessive internal pressure release valve. The lid with an excessive internal pressure release valve according to claim 1, wherein an annular washer is disposed on the lower surface of the annular step portion of the lid, and between the annular washer and the surface of the annular lower valve member. A lid with an excessive internal pressure release valve, characterized by arranging a coil spring. The lid with an excessive internal pressure release valve according to any one of claims 1 to 4, wherein the rod-shaped member is a rod-shaped member whose outer surface is lubricated. 6. The lid with an excessive internal pressure release valve according to claim 5, wherein the lubricating treatment is a Teflon (registered trademark) treatment.