JPS61256073A - Leakage water detecting non-return valve of water pipeline system - Google Patents

Abstract

PURPOSE:To detect water leakage in its early stage by providing a detecting portion for transmitting the rising state of a valve element of a non-return operating portion having a small capacity in a valve element having two non- return operating portions different in capacity for letting flow a forward flow. CONSTITUTION:The first non-return operating portion 2 having a large capacity for letting flow a forward flow comprises a valve seat 2a on a valve main body 1 and a valve element 2b seated thereon. The second non-return operating portion 3 having a small capacity for letting flow a forward flow comprises a valve seat 3a on a member 5 adapted to move up and down with the valve element 2b of the first non-return operating portion 2 and a valve element 3b seated thereon. A detecting portion 4 for detecting the rising state of the valve element 3b of the second non-return operating portion 3b includes an iron piece 9 fixed to the valve element 3b and a permanent magnet 10 disposed on the housing 7 side.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a check valve used in the construction of a detection device for early detection of water leaks occurring in water piping systems of buildings, particularly reinforcing steel buildings. .

Conventional technology: Water leakage in the water supply piping system of a building can be detected by reading the water meter at a long period of time, such as once every three months, and the amount of water consumed is abnormally high. The reality is that the amount of water lost due to water leakage reaches an enormous amount, and is only noticed when something is discovered or when the sound of water leakage becomes loud enough to be heard. The sound of water leakage is rarely audible, and the presence of water leakage is often detected by reading the water meter.

The presence or absence of water leakage can be known by detecting the state of the water meter, but there are legal restrictions on constructing a water leak detection device by entering the internal mechanism of the water meter. The presence or absence of water leakage can also be detected by optically detecting the state of the pointer of a water meter, and although such devices have been proposed in the past, they have not been put into practical use. This seems to be due to dirt and difficulty in inspection.

Furthermore, devices have been proposed in the past that detect the presence of water leakage by acoustically detecting minute water leakage sounds. Difficult and unfeasible in terms of cost and maintenance Problems to be solved by the invention: The present invention aims to develop a water leakage detection device that does not have the drawbacks of conventional water leakage detection devices by installing it on a piping system. This study will focus on the check valves that can be used.

The original function of a check valve is to allow a flow from the upstream side to the downstream side (forward flow), but to prevent a flow from the downstream side to the upstream side (reverse flow). If a valve body lift detection device is added to the valve, the check valve will have the function of a water leakage detection device in addition to its original function. Its function as a water leakage detection device is based on its ability to detect the presence of forward flow regardless of whether or not the water supply is in use.

Detection of the presence or absence of water leakage is automatically carried out using the measurement results taken over several days at appropriate times during the night when it is assumed that the water supply is not being used. In order to minimize the amount of water leakage, it is necessary to remove water as early as possible before the leakage hole becomes large (in other words,
Detection is important when the flow rate of forward flow due to water leakage is small), and the check valve must detect a small amount of forward flow.

The present invention takes the above-mentioned problems into consideration and makes it possible to prevent the presence of a small amount of water flow due to water leakage while utilizing a check valve.

Structure of the invention: The check valve according to the present invention has a first check acting part with a large capacity for forward flow and a second check action part having a small capacity for forward flow in a common valve body. The second check acting part is provided on the valve body such as the valve seat of the first check acting part, and the second check acting part is provided on the valve body of the first check acting part or a member that ascends and descends together with the valve. 0 action characterized by forming a valve seat and providing a detection part for transmitting the raised state of the valve body of the second check action part: The check valve is closed during the time when the water supply is not in use. The logic that there is a water leak only holds true when there is no water leakage, and when there is a water leakage, the backflow valve is constantly open, but the opening degree of the backflow valve due to the presence of water leakage is extremely small. Since check valves are required to have a capacity commensurate with the capacity of the piping (capacity to allow forward flow), the use of a simple check valve will result in some delay in discovering water leaks. This is because the forward flow that occurs in the early stages of water leakage is extremely small. Above 1st.
Of the second check acting parts, the first checking acting part takes care of the capacity for the piping, and the second checking acting part takes care of the detection of forward flow due to the presence of water leakage. to share the load. When the water supply is not in use, most of the forward flow caused by water leakage flows through the second non-returning part with low resistance and small capacity.

Although this non-return function part is unnecessary for the non-return function, it functions with high sensitivity in detecting water leakage.

A signal from the rising state detection section of the valve body of the second check acting section is sent to a control room and a control center that centrally controls a large number of buildings. In the management office and management center, we organize data while taking into account the unique circumstances of the building.
Know the occurrence of water leaks early and take appropriate measures.

Embodiment: FIG. 1 shows an example of a regurgitation valve according to the present invention, and FIG. 2 shows an enlarged view of the essential parts of the regurgitation valve shown in FIG. 1.

In the figure, (1) is the valve body, [21+31 is the first valve body. The second check acting part (4) is the detection part 0 As shown in Fig. 2, the first check acting part (21 is the valve body (
1) Consisting of an upper valve seat (2a) and a valve body (2b) seated on it, the second check acting part (3) and the valve body (2b) of the first check acting part (2) It consists of a valve seat (3a) on a member (5) that moves up and down and a valve body (3b) seated on it.

As pointed out earlier, the first check acting part (2) shares the capacity with respect to the piping, and the second checking acting part (3) takes care of the detection of forward flow due to the presence of water leakage. share the sides.

The valve body (3b) of the second check action part (3) is connected to the rod (6) fixed to the valve body (2b) of the first check action part (2) and the housing (4) of the detection part (4). 7) The rod (
8) Guided by.

The detection part (4) that detects the raised state of the valve body (3b) of the second check action part (3) detects an iron piece ( 9) and a permanent magnet (1G) provided on the side of the housing (7).

The flow rate Q of the forward flow passing through the first check acting part (2)
, the flow rate of the forward flow passing through the second check acting portion (3) is q, then the following can be said about the flow rate Qtq.

a) When the water supply is not used and there is no leakage, Q.
“O, q=O.

b) When the water supply is used, Q > q.

C) If there is no water service but there is a water leak, Q””O
+ q′= is the flow rate due to water leakage. This is because the weight of the valve body (2b) of the first check action section (2) is much greater than the weight of the valve body (3b) of the second check action section (3).

M2 check action part +31 Fi flow path area is sufficiently small,
Moreover, since most of the leakage water is allowed to flow through as described in C) above when the water supply is not in use, the presence of leakage water can be discovered at an early stage. 'Effects of the invention: As clarified from the above explanation, the invention is used to significantly reduce the loss of water resources due to water leakage, and is named a check valve. However, they are used in a completely different manner from conventionally used check valves.These check valves do not obstruct meter reading and are subject to legal restrictions, such as those that use water meters. Furthermore, unlike methods that detect water leakage using acoustic engineering, there is no large economic disadvantage due to the presence of noise or the number of units installed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing an example of a check valve according to the present invention;
FIG. 2 is an enlarged sectional view showing essential parts of the check valve shown in FIG. 1. Figure 2 7: How the detection unit 4 works

Claims (1)

[Claims] A first check acting section with a large capacity for forward flow and a second check acting section having a small capacity for forward flow are provided in a common valve body, and the valve of the first check acting section is provided. A seat is provided on the valve body, and a valve seat of the second check action part is formed on the valve body of the first check action part or a member that ascends and descends together with the valve body, 1. A check valve for detecting water leakage in a water piping system, characterized in that it is provided with a detection section for transmitting the raised state of the valve body of the section.