JPH0338523Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a piping constant flow rate in which a fixed flow path is provided as a bypass in a straight flow path, and both flow paths can be switched with a switching valve or a switching cock. Regarding equipment.

(Conventional technology) Currently, in order to distribute the appropriate flow rate to each load,
Piping constant flow devices are used in piping systems for air conditioning, sanitary, etc.

As examples of valves with a piping constant flow function, the straight type balancer valve (valve with an automatic throttling mechanism) shown in Figure 4 and the built-in strainer type balancer valve shown in Figure 5 are listed in the catalog "Balancer Valve" (Miyoshi 84-3-A) published by Valve Co., Ltd.

In FIG. 4, A is an inlet of cold water or hot water (hereinafter simply referred to as water), and B is an outlet thereof. 101
1 is a ball, 102 is a rubber orifice, and 103 is a needle. If water flows from inlet A to outlet B,
When the pressure difference between the front and rear of the rubber orifice 102 is small, the orifice diameter d does not change much, but when the pressure difference becomes large, the rubber orifice 102 moves to the outlet B.
It deflects to the side and reduces the orifice diameter d to keep the flow rate constant. The needle 103 streamlines and rectifies the fluid flow, thereby suppressing noise.

In FIG. 5, A is the inlet of water, and B is the outlet thereof. 101' is a valve body, 102 is a rubber orifice,
103 is a needle, 104 is a strainer, 10
5 is a valve seat, and 106 is a valve box.

When the valve body 101' separates from the valve seat 105, the water
Enter the valve box 106 from the inlet A, and the strainer 1
04 into the strainer 104, and the rubber orifice 102 and needle 103 are operated in the same way as a straight type balancer valve.
Water is supplied from outlet B to a predetermined location at a constant flow rate.
At this time, limescale, dirt, etc. are said to be caught by the strainer 104.

(Problem to be solved by the invention) In the straight type balancer valve, a constant flow rate inside the piping is ensured by an automatic throttling mechanism that utilizes the elastic deformation of the rubber orifice 102. If dirt gets caught between the rubber orifice 102 and the needle 103, normal operation will not occur.

In addition, in the case of a balancer valve with a built-in strainer, the dust inside the piping is captured by the strainer 104 during water flow, so the operation of the rubber orifice 102 is not likely to be obstructed. However, there was a problem in that cleaning the strainer 104 required a great deal of effort.

However, the amount of waste generated inside the piping system is at its maximum when the piping installation work is completed and water starts flowing during the test run of the equipment. Occurrence is not a big problem.

(Means for solving the problem) The present invention was made in view of the above circumstances, and uses a straight channel for water flow during test runs, and an automatic throttling mechanism for water flow during normal operation. The structure of the present invention is as follows.

A metering flow path is provided as a bypass in the straight flow path, a valve is arranged that can selectively open and switch between the straight flow path and the metering flow path, and an annular stopper whose upstream side surface forms a tapered surface is provided in the metering flow path. A piping constant flow device is provided with a rubber orifice close to the upstream side of the annular stopper, and is equipped with an automatic throttling mechanism in which a needle having a radial support is fixed such that its tip faces the through hole of the rubber orifice. be.

(Function) The piping constant flow device according to the present invention is constructed as described above and operates as follows.

Water flow during the test run is carried out by opening the straight flow path with a valve that can be selectively opened to open the straight flow path and the quantitative flow path. The waste generated within the piping system is flushed with water through the straight flow path and discharged to the outside without flowing into the metering flow path. Water flow during normal operation is
The valve is opened to the metering flow path through an automatic throttling mechanism. Therefore, when the pressure on the upstream side of the rubber orifice exceeds a predetermined value, the rubber orifice is deflected toward the tapered surface of the annular stopper in response to the increase in pressure, and the diameter of the rubber orifice is reduced, and the rubber orifice is bent downstream, that is, straight. To suppress an increase in the flow rate to the flow path and keep the flow rate constant despite an increase in pressure on the upstream side.

Note that the needle has a rectifying effect.

(Example) A first example of a piping constant flow device according to the present invention will be described based on FIGS. 1 and 2.

Reference numeral 1 designates a straight flow path, and 2 represents a quantitative flow path.The quantitative flow path 2 is provided as a bypass for the straight flow path 1. A three-way switching valve 3 is provided at the branch point as a valve capable of selectively switching open the straight flow path 1 and the quantitative flow path 2. This three-way switching valve 3 can be replaced with a three-way switching valve, and a gate valve may be provided in each of the straight flow path 1 and the quantitative flow path 2 on the downstream side of the branch point.

An annular stopper 2c for locking an automatic throttle mechanism 4, which will be described later, is provided in the quantitative flow path 2. The annular surface on the upstream side of the annular stopper 2c forms a tapered surface 2c'' toward the through hole 2c'. 4 is an automatic throttle mechanism inserted and fixed in the quantitative flow path 2, and the tip of the cylindrical body 4a An annular rubber orifice 4b on the inner peripheral surface of the part
The outer peripheral surface of the needle 4c is fixed, and a radial support provided at the base of the needle 4c, whose tip end faces the through hole of the rubber orifice 4b in a loosely inserted state, is fixed to the inner peripheral surface of the base end. Such an automatic diaphragm mechanism 4 has a cylindrical body 4
The tip of a is brought into contact with the base of the tapered surface 2c'' of the annular stopper, and a gap is left between the through hole of the rubber orifice 4b and the through hole 2c' of the annular stopper to allow for the bending of the rubber orifice 4b. The outer peripheral surface of the body 4a is fitted into the inner peripheral surface of the quantitative flow path 2.5
is a retaining ring that locks the rear end surface of the cylindrical body 4a.
Reference numeral 6 denotes a plug, which is closed after the automatic throttling mechanism 4 is installed into the quantitative flow path 2 through the through hole 2d provided at the end on the inlet 2a side of the quantitative flow path 2.

Next, the effect will be explained.

After the piping installation work for air conditioning, sanitary, etc. is completed,
Water flow during a test run of the device is carried out by opening the three-way switching valve 3 to the straight channel 1, as shown in FIG. Therefore, the generated waste inside the pipe is washed away by water in the straight flow path 1 and removed by a temporary strainer provided in the main pipe.

Next, water flow during normal operation is performed by opening the three-way switching valve 3 to the quantitative flow path 2, as shown in FIG. The flow rate of water flowing through the quantitative flow path 2 is adjusted by an automatic throttle mechanism 4. That is, when water flows from the inlet 2a to the outlet 2b of the metering flow path, when the pressure difference between the upstream and downstream sides of the rubber orifice 4b is small, the diameter of the rubber orifice does not change, but when the pressure difference becomes large, the diameter of the rubber orifice does not change. , rubber orifice 4b
reduces the gap between the annular stopper and the through hole 2c' and bends toward the through hole 2c' side, and the rubber orifice 4b
Reduce the diameter of the flow rate to suppress the increase in flow rate and keep the flow rate constant. At this time, the needle 4c performs a rectifying action.

A second embodiment will be described based on FIG.

1 is a straight channel, 2 is a metering channel, 2a is a metering channel inlet, 2b is a metering channel outlet, 2c is an annular stopper provided in the metering channel, 2c' is a through hole of the annular stopper, 2c'' is an annular A tapered surface formed on the upstream side surface of the stopper, 3 is a three-way switching valve. 4' is an automatic throttle mechanism, whose outer peripheral edge is brought into contact with the base of the tapered surface 2c'' of the annular stopper, and the outer peripheral surface is controlled to flow at a constant rate. A rubber orifice 4'b is fitted onto the inner circumferential surface of the channel 2 and fixed elastically, and the end surfaces of the plurality of radial columns are brought into contact with the inner circumferential surface of the quantitative flow channel 2, and the tips are attached to the rubber orifice 4'. The nozzle 4'c faces the through hole b and is positioned by both retaining rings 5 and 7.

Therefore, it has the same effect as the first embodiment.

(Effects of the invention) As can be understood from the above explanation, according to the piping constant flow device of the present invention, when there is a lot of waste generated in the pipe during the test run of the device, water can be passed through the straight flow path. Dust is flushed out along with the water, and then water can be passed through a constant flow path during normal operation, so a constant flow rate is supplied to each load, such as air conditioning and sanitary equipment, without dust getting caught in the automatic throttling mechanism. can.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of the first embodiment of the piping constant flow device according to the present invention, and FIG.
FIG. 2 shows water passing through the straight channel, FIG. 2 shows water passing through the quantitative flow channel, FIG. 3 is a sectional view of the second embodiment showing water passing through the quantitative flow channel, and FIG. and FIG. 5 are sectional views of a valve equipped with a conventional automatic throttling mechanism, respectively. 1: Straight channel, 2: Metering channel, 2a: Inlet, 2b: Outlet, 2c: Annular stopper, 2c': Through hole, 2c'': Tapered surface, 2d: Through hole, 3: Three-way switching valve, 4, 4': Automatic diaphragm mechanism, 4a: Cylindrical body, 4
b, 4'b: Rubber orifice, 4c, 4'c: Needle, 5, 7: Retaining ring, 6: Plug.

Claims (1)

[Scope of utility model registration request] A metering flow path is provided as a bypass in the straight flow path, a valve is arranged that can selectively open and switch between the straight flow path and the metering flow path, and an annular stopper whose upstream side surface forms a tapered surface is provided in the metering flow path. A rubber orifice is provided close to the upstream side of the annular stopper, and an automatic throttling mechanism is provided in which a needle having a radial support is fixed such that its tip faces the through hole of the rubber orifice. Piping constant flow device.