JPH0417656Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a drain funnel that discharges drain from various facilities and equipment to an external drainage ditch, etc. This invention relates to a drain funnel equipped with a mechanism that prevents gas flow when the liquid sealing effect disappears.

[Prior Art] Conventionally, when discharging drain from a facility or equipment into an external drainage ditch, a drain funnel that maintains a liquid seal has been used to prevent gas flow between the facility or equipment and the outside. ing. By using this drain funnel, it is possible to maintain the airtightness of facilities, etc., and to prevent the inflow and outflow of harmful gases.
It is especially important to maintain airtightness in facilities that handle radioactive materials, such as nuclear power plants.

As shown in FIG. 3, a drain funnel conventionally used for this purpose has a drain inlet portion 1 having an opening formed by, for example, a perforated plate or a slit plate in the upper part. It consists of a funnel body 2, an overflow discharge tube 3 erected upward from the bottom 2a of the funnel body 2, and a liquid seal cap 5 that covers the overflow discharge tube 3 and has a liquid passage part 4 at its lower part. There is something.

The perforated plate or the like provided in the drain inflow section 1 is for preventing foreign matter such as dust from flowing into the funnel body 2 together with the drain, but it is not recommended that the drain inflow section 1 be directly connected to a device or the like. It may be omitted in some cases.

Drain that has flowed into the funnel body 2 from the drain inflow portion 1 flows into the liquid seal cap 5 as shown by the arrow through the liquid passage portion 4, and then overflows from the open end of the overflow discharge tube 3 and is discharged from the tube. The liquid flows down inside the cylinder and is discharged to an external drainage ditch or the like through a discharge pipe 6 connected to the cylinder. Therefore, a liquid level that coincides with the open end of the overflow discharge tube 3 is formed in the funnel body 2, so that the drain inflow portion 1
Gas flow between the side and the discharge pipe 6 side communicating with an external drain etc. is prevented.

To prevent gas flow in this type of drain funnel, a constant liquid level is always formed within the funnel body 2, and it is necessary to maintain the liquid sealing effect by the liquid seal cap 5.

[Problem that the invention attempts to solve]

However, the drain flowing into the drain funnel is not always constant and often flows intermittently. In such a case, the drain temporarily stored in the funnel body 2 may evaporate and the liquid level may drop, leading to loss of liquid sealing effect.
In facilities such as nuclear power plants, where it is necessary to reliably prevent gas flow through the drain funnel due to loss of liquid sealing for safety reasons, a large number of drain funnels must be rotated periodically for this purpose. They inspect the area regularly and carry out work such as filling it with water.

Drain funnels are sometimes installed in places that are difficult to inspect, and there are many of them, so there is a problem that such work is troublesome and requires a lot of man-hours.

Incidentally, there is a trap described in Japanese Utility Model Publication No. 50-27932 that blocks odor from sewerage, etc., when the residual water in the floor trap evaporates and disappears. This is constructed so that the drain flowing down the trap flows into an inner cylinder with an inclined bottom and flows out from a discharge port provided on the side of the inner cylinder, and the discharge port is equipped with a blocking plate that closes due to its own weight. It is something that This blocking plate is configured to open when a drain exists.

Therefore, even when the residual water in the trap disappears due to evaporation, etc., the blocking plate remains closed, so it is possible to block the odor from the sewerage system, etc.

However, in the case of this prior art, it is unavoidable that a certain amount of air flows between the blocking plate and the discharge port. In particular, there is a risk that water scale or the like may adhere to the periphery of the discharge port, which may increase the gap.

The present invention solves the problems of conventional drain funnels, and uses a double water seal structure to completely prevent gas flow due to the drop in the liquid level within the funnel body and the loss of liquid seal action. To provide a drain funnel in which a water seal on the outlet side remains even if the water seal on the inlet side is broken.

[Means for solving problems]

The drain funnel of the present invention includes a funnel main body 2 having a drain inflow part 1 at the upper part, and a funnel main body 2 which is erected upward from the center of the bottom of the main body 2, and whose upper end opening is located below the inflow part 1. An overflow discharge tube 3 that forms a first liquid reservoir between the funnel body 2 and a bowl-shaped tube that covers the discharge tube 3 is inserted into the first liquid reservoir, and an A liquid seal cap 5 having a liquid passage portion 4 and a second liquid reservoir provided between the liquid seal cap 5 having the liquid passage portion 4 and the upper end opening, which is provided at a position below the upper end opening in the discharge tube 3 and is always closed by the elastic force of a spring. to form the ejection tube 3
At the same time, when the drain in the liquid reservoir reaches a predetermined depth, the discharge cylinder 3 is opened against the elastic force of the spring, and only a part of the drain in the second liquid reservoir is opened. It is equipped with a drain discharge valve 17 for discharging water.

The drain funnel of the present invention having such a structure always has a double water seal structure. That is, the first liquid reservoir and the liquid seal cap 5 constitute a first liquid seal. At the same time, a second liquid seal part is formed by the second liquid reservoir part and the drain discharge valve 17.

Therefore, even if the first liquid seal part is torn due to evaporation or the like, the second liquid seal part exists, so that the liquid flow can be completely blocked.

Further, even if the liquid in the second liquid reservoir evaporates, the spring action of the discharge valve can completely close the gap and prevent gas flow.

[Examples and effects]

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a sectional view showing an example of the drain funnel of the present invention, which includes a funnel main body 2 having a drain inlet 1 at the upper part, an overflow discharge tube 3, a liquid seal cap 5, and a drain funnel connected to the overflow discharge tube 3. The configuration of the discharge pipe 6 and the like is similar to the conventional one shown in FIG. 3 described above. A first liquid reservoir is formed between the outer periphery of the overflow discharge tube 3 and the funnel body 2, and the liquid reservoir and the liquid seal cap 5 constitute a first liquid seal 21.

A drain container 7 is provided within the overflow discharge cylinder 3. The drain container 7 has a cylindrical body 8 having an outer diameter that is approximately equal to or slightly smaller than the inner diameter of the overflow discharge tube 3, and is provided at the top of the cylindrical body 8 and has a diameter that is smaller than the inner diameter of the overflow discharge tube 3. It has a support plate 10 with a large outer diameter and a drain inlet 9. Furthermore, the drain container 7 has an annular valve seat 1 formed around the periphery of the opening at the bottom thereof.
1. A disk-shaped valve body 12 having an outer diameter that comes into contact with the valve seat 11, a valve stem 13 extending upward from the center of the valve body 12, a stopper 14 provided at the top of the valve stem 13, and a support plate. A valve shaft holder 15 that passes through the center of the valve shaft 10 so as to be vertically movable by means of a screw connection and slidably holds the upper part of the valve shaft 13;
That is, in order to bias the valve body 12 in the direction in which it comes into pressure contact with the valve seat 11, a drain discharge valve 17 is provided which is constituted by a compression spring 16 stretched between the bottom of the valve stem holder 15 and the stopper 14. . By rotating the valve stem holder 15, the biasing force of the compression spring 16 can be adjusted. Further, in order to ensure a more reliable airtight seal, it is preferable to form an elastic sealing surface made of rubber or the like on at least one of the surfaces where the valve seat 11 and the valve body 12 come into contact.

The cylindrical body 8 constituting the peripheral wall portion of the drain container 7 can use the inner wall of the overflow discharge cylinder 3 as it is, or can be formed integrally with it.

FIG. 2 is a sectional view showing another example of the drain funnel of the present invention. The only difference from the example shown in FIG. 1 is the structure of the drain discharge valve 17, and the rest is the same as that in FIG.

The drain container 7 provided in the overflow discharge cylinder 3 has a cylindrical body 8, a support plate 10 provided at the top of the cylindrical body 8 and having a drain inlet 9, and further includes a support plate 10 provided at the top of the cylindrical body 8 and a drain inlet 9. An annular valve seat 11 formed around the periphery of the opening, a disc-shaped valve body 12 having an outer diameter that contacts the valve seat 11, and a valve body 12 provided at the bottom of the cylindrical body 8, with one end of the valve body 12 a support shaft 18 rotatably supported;
In order to bias the valve body 12 upward about the support shaft 18, that is, in a direction in which it comes into pressure contact with the valve seat 11,
The drain discharge valve 17 includes a coil spring 19, a part of which is wound around a support shaft 18, and a coil spring 19 whose distal end extends to the lower surface of the valve body 12. Valve body 1
The magnitude of the biasing force 2 can be changed by changing the tension of the coil spring 19. In the case of FIG. 2 as well, the cylindrical body 8 can utilize the overflow discharge tube 3 or can be made integrally therewith. This drain container 7 constitutes a second liquid reservoir, and a second liquid seal part 22 is formed therein when the drain discharge valve 17 is in a closed state.

Next, the function of the drain funnel shown in FIGS. 1 and 2 will be explained.

Drain discharged from the device etc. flows into the funnel main body 2 from the drain inflow section 1. When the liquid level in the funnel body 2 rises, the drain flows through the liquid passage portion 4 into the liquid seal cap 5 as shown by the arrow. When the liquid level in the liquid seal cap 5 rises and exceeds the top of the overflow discharge cylinder 3, the excess drain flows down into the drain container 7 through the drain inlet 9 as shown by the arrow.

When the liquid level in the drain container 7 rises above a certain value due to the drain flowing down, the force pushing the valve body 12 downward due to the weight of the drain flowing in is converted into an upward biasing force by the compression spring 16 or the coil spring 19. The valve element 12 separates from the valve seat 11 as shown by the dotted line and opens. As a result, the drain in the drain container 7 is discharged to the discharge port 20 side of the overflow discharge cylinder 3.

When the drain in the drain container 7 is discharged by the drain discharge valve 17 in this way, the liquid level decreases and the biasing force of the compression spring 16 or the coil spring 19 applied to the valve body 12 increases the weight of the drain. When the force becomes larger than the downward pushing force, the valve body 12 is again pressed against the valve seat 11 and closed. At this time, an amount of drain water is held above the valve body 12 in an amount corresponding to the elastic force of the coil spring 19 or the compression spring 16. Thereafter, such an operation is repeated every time the liquid level in the drain container 7 rises.
Note that the maximum flow rate of this drain discharge valve 17 needs to be set larger than the maximum flow rate flowing into the drain funnel.

[Effect of the invention] Since the drain funnel of the present invention has the above structure, it is assumed that the liquid inside the funnel body evaporates and the liquid level decreases, causing the liquid sealing effect of the first liquid sealing part to disappear. Also, since the second liquid seal portion is present, complete gas flow can be prevented for a longer period of time.

Furthermore, when even the liquid in the second liquid seal part disappears, the drain discharge valve 17 is pressed against its valve seat by the elastic force of the spring, so that the flow of gas can be effectively blocked.

The drain funnel of the present invention is particularly effective when used in places such as nuclear power plants where it is necessary to reliably prevent gas flow inside and outside the facility via the drain funnel for safety reasons. Demonstrate.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing specific examples of the drain funnel of the present invention, and FIG. 3 is a cross-sectional view of a conventional drain funnel. 1...Drain inflow part, 2...Funnel body,
3...Overflow discharge cylinder, 4...Liquid passage part, 5...
... Liquid seal cap, 6 ... Discharge pipe, 7 ... Drain container, 8 ... Cylindrical body, 9 ... Drain inlet, 10
... Support plate, 11 ... Valve seat, 12 ... Valve body, 13
... Valve shaft, 14 ... Stopper, 15 ... Valve shaft holder, 16 ... Compression spring, 17 ... Drain discharge valve, 18 ... Support shaft, 19 ... Coil spring,
20...Emission port.

Claims (1)

[Scope of utility model registration request] A funnel main body 2 has a drain inflow part 1 at the upper part, and a funnel main body 2 is provided between the funnel main body 2 and the funnel main body 2, which is erected upward from the center of the bottom of the main body 2, and whose upper end opening is located below the inflow part 1. an overflow discharge tube 3 forming one liquid reservoir;
A liquid-sealing cap 5 whose bowl-shaped cylindrical part is inserted into the first liquid reservoir part and has a liquid passage part 4 at its lower part, and a liquid-sealing cap 5 provided at a position below the upper end opening in the discharge cylinder 3. is constantly closed by the elastic force of the spring to form a second liquid reservoir between the upper end opening and the flow of the discharge tube 3, and the drain of the liquid reservoir is kept at a predetermined depth. and a drain discharge valve 17 which releases only a part of the drain from the second liquid reservoir by opening the discharge cylinder 3 against the elastic force of the spring.