JPH0315672Y2 - - Google Patents

Description

[Detailed description of the invention] 1. Industrial application field The present invention relates to a check valve, and more specifically, it is used to prevent backflow of sewage by installing it at the inlet of a sewage basin leading to a main sewer pipe, for example. The present invention relates to a preferred and improved check valve.

2 Prior Art When introducing wastewater discharged from houses, stores, factories, buildings, etc. into the sewer system, as shown in Figure 1, these wastewaters 12 are transferred from the drain pipe 40 in the site SR of the house etc. to the public road PW underground. A widely used method is to temporarily store the water in a buried public sewage tank 41 and lead it to the main sewer pipe 43 via a branch pipe 42.

However, when the amount of rainfall per unit time becomes extremely large, such as during a typhoon, and exceeds the swallowing capacity of the sewerage system, rain sometimes flows from the main sewerage pipe 43 through the branch pipe 42, the public sewage basin 41, and the drain pipe 40. The sewage may then flow back into the SR of the above-mentioned residences and other facilities. This kind of situation is caused by
This is extremely inconvenient from a sanitary standpoint.

In order to prevent such a situation, it is possible to make the drain pipe 40 protrude slightly into the public sewage basin 41 and place a check valve on this protrusion to prevent the backflow of sewage, and this has been implemented in some cases. ing.

Examples of the above-mentioned check valve include a check valve as shown in FIG. 2 and FIG. 3, which is a sectional view taken along the line - in FIG. 2.

This check valve 21 includes a tubular valve body 22, a valve plate 29
and a hinge 32 for attaching the valve plate 29 to the valve body 22 in an openable and closable manner. The hinge 32 is the valve body 22
Hinge fitting 31 attached to the upper side of the outer periphery of the end of
and a hinge attachment portion 30 provided on the valve plate 29 by countersunk screws 33, respectively.

The end of the valve body 22 on the valve plate 29 side is connected to the shaft 3 of the hinge 32.
It is cut downward from 2a at an angle of about 30 degrees from a plane perpendicular to the axis, forming an inclined end face. An annular valve seat 23 is provided at this end of the valve body 22 from the inner peripheral surface toward the axis.
The valve plate 29 side end surface 23a is on the same plane as the above-mentioned inclined end surface of the valve body 22.

As shown by the arrow, the waste water 12 flows into the valve body 21, passes between the valve seat 23 and the valve plate 29, and enters the first valve body 21.
It is accommodated in the public sewage tank 41 shown in the figure.

When the amount of rainfall increases significantly and sewage 13 attempts to flow into the check valve 21 shown in FIG. 3 from the sewer main pipe 43 shown in FIG. 1, the pressure causes the valve plate 2 to
9 rotates about the shaft 32a of the hinge 32 as a fulcrum and seats on the valve seat 23 as shown by the dashed line in the figure, thereby closing the check valve 21 and preventing backflow of sewage.

However, the hinge 32 is made of metal and corrodes in sewage, and the valve plate 29 is made of metal.
Since the hinge 32 is rotatably attached to the valve body 22, the strength of the attachment portion is not strong, and the hinge 32 will eventually break and cannot withstand long-term use.

3. Purpose of the invention The purpose of the invention is to solve the problems of the conventional check valves as described above, and to provide a check valve with excellent durability that can be used for a long period of time.

4. Structure of the invention In other words, the invention consists of a valve body having a valve seat on its inner periphery, and a valve plate disposed within the valve body so as to be able to sit on and be removed from the valve seat, and the valve body has a valve seat on the inner circumference. It has a valve plate suspension hole provided through an upper wall portion on the downstream side of the valve seat, and a discharge passage provided in the lower wall portion on the downstream side, and the valve plate is connected to the valve plate. The present invention relates to a check valve having a neck portion that is engaged and held in a suspension hole, and configured to perform the seating and disengagement operations according to the fluid flow direction in this engaged state.

5 Example A preferred example of the present invention will be described below with reference to FIGS. 4 to 8.

FIG. 4 is a side view showing the check valve according to the present invention in a normal usage state, and FIG. 5 is a sectional view taken along the line - in FIG. 4.

The check valve 1 consists of a tubular valve body 2 and a valve plate 8.

The valve body 2 is provided with an annular valve seat 3 on its inner periphery, and on the downstream side of the valve seat 3, a rectangular valve plate suspension hole 10a is formed in the upper wall from the position of the end surface 3a of the valve seat 3 toward the rear.
is penetrated. There is a portion on the lower wall of the valve plate suspension hole 10a that is cut out over a range of approximately 90 degrees rearward from a position spaced apart from the end surface 3a of the valve seat 3 by the thickness of the valve plate body 9. This forms a drainage channel 4.

The valve plate 8 includes a disc-shaped main body 9, a neck 10 extending radially from the main body 9, and a locking piece 11 extending from the neck 10.

The neck 10 of the valve plate 8 is connected to the valve plate suspension hole 1 of the valve body 2.
0a with some play, the locking piece 11 locks onto the outer peripheral surface of the valve body 2 along the valve plate suspension hole 10a, and the valve plate 8 is suspended from the valve body 2.

The wastewater 12 that has flowed into the check valve 1 passes through the inside of the valve seat 3, the space between the valve seat 3 and the valve plate 8, and the drainage channel 4, as shown by the arrow in the figure, and then flows into the public sewage basin 41 ( 1st
(see figure).

When sewage flows backwards and attempts to flow into the check valve 1, as shown in FIG. 9a comes into contact with the end surface 3a of the valve seat 3, the check valve 1 is closed, and the backflow of the waste water 13 is prevented.

If a part of the outer periphery of the valve plate main body 9 is significantly separated from the inner periphery of the rear end of the valve main body 2 due to the pressure of the waste water 12, the movement of the valve plate 8 as described above due to the pressure of the waste water 13 is prevented, and the check valve 1 may become unable to close. In order to prevent such a situation, as shown in FIGS. 4 to 6, there is a
The valve plate main body 9 is stopped at the position of the stoppers 7 by protruding inwardly.

FIG. 7 shows an exploded view of each part constituting the check valve. Figures a and b show the valve body 2 and the stopper 7, where a is a plan view and b is a side view. Figure c is a side view of the valve plate 8.

As mentioned above, the valve body 2 includes the neck 1 of the valve plate 8.
A valve plate suspension hole 10a into which the valve plate 0 is inserted with play passes through the valve plate suspension hole 10a. The rear portion 10b of the valve plate suspension hole 10a of the valve body 2 is parallel to the axis so as to have sufficient mechanical strength to support the valve plate neck 10 against the pressure of the drainage water 12 (see FIG. 5). It has enough length in the direction.

The valve body 2 has a stopper fitting hole 7b which is tapered at a position approximately 60 degrees left and right from the rear upper part of the valve plate suspension hole 10a, and has a taper that matches this taper, and the head 7a. A stopper 7 with a mark is fitted into the stopper fitting hole 7b and fitted into the valve body 2.

Next, the procedure for assembling each element constituting the above-mentioned check valve will be explained with reference to FIG. 8.

First, as shown in FIG. 8a, the valve plate 8 is attached to the valve body 2.
At an angle to While rotating, as shown in FIG. After rotating the valve plate 8 so that the stopper 7 is inserted into the stopper insertion hole 7b as shown in FIG.
is fitted to form an integrated check valve 1.

With the above structure, the check valve of this example can reliably prevent backflow, and has a simple structure and can be constructed without using metal parts (for example, all parts are made of hard vinyl chloride). The valve plate suspension hole 10a shown in FIGS. 5, 6, and 8a has a sufficient length at the rear portion 10b. This makes it mechanically robust and can withstand long-term use.

The check valve according to the present invention can be used not only in public sewage basins as described above, but also in a wide range of fields such as factories, ships, and other devices and facilities that require prevention of fluid backflow. .

6 Effects of the invention As explained above, the check valve according to the invention has the following effects:
With the above-mentioned configuration, backflow can be reliably prevented, the structure is simple and robust, and there is no need to use metal parts, so there is no risk of corrosion and excellent durability. Therefore, when using the check valve according to the present invention, houses and other facilities can be used with peace of mind for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view for explaining the route of wastewater to the main sewer pipe. FIGS. 2 and 3 show the structure of a conventional check valve, with FIG. 2 being a side view and FIG. 3 being a cross-sectional view taken along the - line in FIG. Fourth
8 to 8 show an example of the check valve according to the present invention, in which FIG. 4 is a side view in normal use, FIG. 5 is a sectional view taken along the line - in FIG. Figure 6 is a sectional view showing the state of the check valve when preventing backflow;
Figure 7 shows each element constituting the check valve, a is a plan view of the valve body, b is a side view of the valve body, c is a side view of the valve plate, and Figure 8 shows the procedure for assembling the check valve. FIG. 1 is a perspective view showing the initial state during assembly, FIG. 1B is a perspective view showing the middle stage of assembly, and FIG. 3C is a side view showing the state after assembly. In addition, in the symbols shown in the drawings, 1, 21
... Check valve, 2, 22 ... Valve body, 3, 23 ...
Valve seat, 4... Drain channel, 7... Stopper, 8, 2
9... Valve plate, 9... Valve plate body, 10... Valve plate neck, 10a... Valve plate suspension hole, 11... Valve plate locking piece, 12... Drainage, 13... Backflow sewage, 40...
Drain pipe, 41...public sewage tank, 42...branch pipe,
43...The main sewer pipe.

Claims (1)

[Scope of utility model registration request] It consists of a valve body having a valve seat on its inner periphery, and a valve plate arranged within the valve body so that it can be seated on and removed from the valve seat, and the valve body has an upper wall portion on the downstream side of the valve seat. It has a valve plate suspension hole provided through the valve plate and a discharge passage provided in the lower wall portion on the downstream side, and the valve plate is engaged and held in the valve plate suspension hole. A check valve having a neck portion and configured to perform the seating and disengagement operations according to the direction of fluid flow in this engaged and held state.