JPH0718771B2 - Water leak detector - Google Patents

Description

The present invention relates to a water leak detection device.

In a machine that requires cooling water, such as a resistance welding machine, when water leaks into the machine due to some accident, it is detected and the operation of the automatic machine is stopped to stop the abnormal progress and stop the water. It is necessary to prevent the flooding of water. The present invention finds use in this field.

b Conventional Technology Even for machines that circulate and cool, most of the current machines have no flow rate detecting means or only a visual water flow detecting device is provided at the drain port.

c Problems to be solved by the invention If only a water flow detector, a flow meter, etc. are installed at the drain outlet, an abnormal signal may be generated due to fluctuations in the source pressure of the cooling water, or the amount of leakage may be greater than the amount of water supplied. There is a problem that a signal is not generated when there are few.

It is also possible to install a flowmeter etc. independently on the water supply side and detect water leakage from the difference between the indication on the drainage side flowmeter and the water supply side flowmeter. Since it is unavoidable, it is difficult to detect water leakage from the difference in the instructions.

An object of the present invention is to provide a water leak detection device that can directly detect water leaks.

d Means for Solving the Problems The above problems include a water supply side passage, a drainage side passage, a partition wall dividing the water supply side passage into an upstream side and a downstream side, and the drainage side passage into an upstream side and a downstream side. A partition wall, a through hole provided in each of the partition walls, a connection hole connecting the water supply side passage and the drainage side passage, a first diaphragm provided in an upstream portion of the water supply side passage, A second diaphragm provided at a downstream side portion of the water supply side passage, a third diaphragm provided at an upstream side portion of the drainage side passage, and a fourth diaphragm provided at a downstream side portion of the drainage side passage. And, through the both through holes and the connecting hole, connecting the first, second, third, and fourth diaphragms, forming an orifice between the both through holes, and the water supply by the orifice. Between and above the upstream and downstream sides of the side passage A pressure difference is generated between the upstream side and the downstream side of the drainage side passage, which corresponds to the pressure difference between the upstream side and the downstream side of the water supply side passage and the difference in pressure between the upstream side and the downstream side of the drainage side passage. The present invention has been made to solve the problem by a water leakage detection device including a spool that is displaced according to the present invention, and a displacement detection unit that detects the displacement of the spool.

e Action The cooling water or the like that has passed through the water supply side flow passage is sent to a resistance welding machine or the like that requires cooling water or the like, and the cooling water or the like that has passed through the resistance welding machine or the like flows into the drainage side flow passage. When there is no water leakage, the flow rate flowing through the water supply side flow path is equal to the flow rate flowing through the drainage side flow path.

The difference in pressure between the upstream side and the downstream side of the orifice of the water supply side passage changes depending on the flow rate of the water supply side passage. Further, the pressure difference between the upstream side and the downstream side of the orifice of the drainage side passage changes depending on the flow rate of the drainage side passage. The difference between these pressure differences is
Appearing as a force acting on the third and fourth diaphragms, and the spool connecting these diaphragms, the displacement of the spool corresponds to the difference between the flow rate of the water supply side passage and the flow rate of the drain side passage. Therefore, water leakage can be detected by measuring the displacement of the spool.

f Embodiment FIG. 1 is a sectional view of a preferred embodiment of the water leak detection device according to the present invention.

Screws 1a and 1b for connecting to the pipe are cut at the inlet and outlet of the water supply side channel 1, and screws 2a and 2b for connecting to the pipe are cut at the inlet and the outlet of the drainage side channel 2, respectively. , Connected to piping (not shown).

The water supply side flow passage 1 and the drainage side flow passage 2 are divided into upstream and downstream portions by partition walls 1c and 2c, respectively, and through holes 1d and 2d are formed in the partition walls 1c and 2c, and the through holes 1d and 2d are shared. The spool 3 of is penetrated. The spool 3 includes a first diaphragm 4 forming part of the inner wall of the upstream side of the water supply side flow path, a second diaphragm 5 forming part of the inner wall of the downstream side, and an inner wall of the downstream side of the drainage side flow path. Is held by a third diaphragm 6 forming a part, a fourth diaphragm 7 forming a part of the inner wall of the upstream part, and both ends thereof are formed by a first spring 8,
It is supported by the second spring 9.

Since the fluids flowing through the water supply side flow path and the drainage side flow path respectively flow through the orifices formed by the spool 3 and the through holes 1d and 2d, the pressures of the upstream parts of the water supply side flow path and the drainage side flow path, respectively. Is higher than the downstream pressure. Therefore, in the water supply side flow path and the drainage side flow path, a force acts to displace the spool upstream. The pressure difference between the upstream side and the downstream side of the orifice corresponds to the flow rate through the orifice.
These forces act on the spool 3 in opposite directions, and the spool 3 is displaced until the difference between the forces becomes equal to the difference in elastic force between the first spring 8 and the second spring 9. Spring
The elastic forces of 8 and 9 are adjusted by the first adjusting screw 8a and the second adjusting screw 9a. In this embodiment, the first working surface is the first diaphragm 4 and the second diaphragm 5,
The second working surface is the third diaphragm 6 and the fourth diaphragm 7.

In the displacement of the spool 3, in this embodiment, the light receiver 11 detects whether the light emitted from the light emitter 10 passes through a hole (not shown) provided in the spool 3. When there is water leakage, the force from the water supply side passage and the force from the drainage side passage are not equal, so the spool is displaced and the optical path is blocked. At this time, a water leakage signal is generated from a conventional electric circuit (not shown) based on the signal from the light receiver 11.

Since the water supply side and the drainage side are formed symmetrically, the water supply side and the drainage side can be connected in reverse.

g Effect of the invention Since the water leak detection device according to the present invention directly detects the difference between the water supply side flow rate and the drainage side flow rate, the water leakage can be reliably detected even if there is a flow rate fluctuation or electric gain fluctuation. be able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a preferred embodiment of a water leak detection device according to the present invention. 1 ... water supply side flow path, 2 ... drainage side flow path, 1a, 1b ... connection screw, 2a, 2b ... connection screw, 1c, 2c ... partition wall, 1d, 2d
...... Through hole, 3 ... Spool, 3a ... Hole, 4 ... First diaphragm, 5 ... Second diaphragm, 6 ... Third
Diaphragm, 7 ... fourth diaphragm, 8 ... first spring, 9 ... second spring, 8a ... first adjusting screw,
9a: second adjusting screw, 10: light emitter, 11: light receiver.

Claims (2)

[Claims] 1. A water supply side passage (1) and a drainage side passage (2)
And a partition (1 that divides the water supply side passage into an upstream side and a downstream side).
c), a partition wall (2c) dividing the drainage side passage into an upstream side and a downstream side, through holes (1d, 2d) respectively provided in the partition walls (1c, 2c), and the water supply side passageway (1) And a connection hole for connecting the drainage passage (2) and the water supply passage (1)
First diaphragm (4) provided in the upstream part of the
A second diaphragm (5) provided on the downstream side of the water supply side passage (1), and a third diaphragm (6) provided on the upstream side of the drainage side passage (2), The fourth diaphragm (7) provided in the downstream side portion of the drainage side passageway (2) and the first, second, third and fourth diaphragms that penetrate the both through holes and the connecting hole. (4,5,6,7)
And an orifice is formed between the both through holes (1d, 2d), the orifice between the upstream side and the downstream side of the water supply side passage (1) and the upstream side of the drainage side passage (2). Between the upstream side and the downstream side of the water supply side passage (1) and the pressure difference between the upstream side and the downstream side of the drainage side passage (1) A water leak detection device comprising: a spool (3) that operates and a displacement detection unit that detects displacement of the spool (3). 2. The water leak detection device according to claim 1, wherein the displacement detection means is an optical position detection means.