JPS6052345B2 - High and low pressure water automatic switching valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic high-low pressure water switching valve that can supplementally supply low-pressure water to an intermittent high-pressure water water supply pipeline when the high-pressure water is stopped intermittently.

"Conventional Technology J Conventional high-pressure water supply equipment for descaling rolled slabs supplies high-pressure water intermittently, and after passing the rolled slab, the high-pressure water supply is abruptly stopped, creating a vacuum section due to inertia. , high-pressure water flows back to the vacuum section side, and the backflow creates air pockets in the high-pressure water transmission pipe side, making it difficult to cope with high-speed intermittent supply of high-pressure water (for example, intermittent high-pressure water supply to a high-speed moving rolling slab), and water hammer due to backflow. It was difficult to prevent this phenomenon and the air pocket phenomenon (Japanese Patent Publication No. 39-29418).

"Problems to be Solved by the Invention" The present invention automatically supplies low-pressure water into the high-pressure water conduit when the high-pressure water is stopped in the intermittent high-pressure water supply operation, and replenishes the vacuum part caused by inertia with the low-pressure water. The purpose of this system is to smoothly provide intermittent high-pressure water supply by preventing backflow and preventing air pockets caused by backflow.

Means for Solving Problem 1 The present invention has a high-pressure water inlet at one end of the valve case, a low-pressure water supply port at the other end, and a short cylindrical hollow valve inside the valve case. The bodies are slidably fitted together, a water passage hole is opened in the middle of the side surface of the valve body, and a water passage is formed inside the valve body by opening the end surface of the other end of the valve body. A high-pressure water introduction sealed chamber is formed inside the valve box between the end surface of the one end of the valve body and the inlet, and when the valve body slides toward the one end, the water passes through. A water inlet that matches the hole is opened in the sealed chamber, and a tapered valve for high pressure water check is aligned with the taper valve seat formed in the water inlet, and when the introduction of high pressure water into the sealed chamber is stopped, the taper valve The specified invention consists of a high/low pressure water automatic switching valve consisting of a seat and a taper valve, which is opened by low pressure water.

When the high-pressure water supply valve 28 opens and high-pressure water is sent to the high-pressure water supply pipe 31, the high-pressure water in the pipe 31 flows from the high-pressure water inlet 2 to the high-pressure water introduction sealed chamber 7. The high-pressure water check taper valve 10 is pressed against the taper valve seat 9 to close the high-pressure water backflow to the low-pressure water pipe 30 can be prevented.

Then, when the supply valve 28 is closed and the supply of high-pressure water is stopped, the low-pressure water presses the low-pressure sliding piston 11 and the inner surface of the one end side of the valve body 4, and the valve is moved to the imaginary line position in FIG. Slide the body 4 to connect the water passage hole 5 of the valve body 4 to the water supply port. 8
Accordingly, the low-pressure water can press the taper valve 10 to open it and send the low-pressure water to the high-pressure water supply pipe 31 through the sealed chamber 7 and the inlet 2. Also, the water pressure of the low-pressure water is adjusted appropriately by the control valve 12! Can be adjusted.

1 Embodiment To explain an embodiment of the present invention shown in the drawings, a bento box 1
A high-pressure water inlet 2 in the longitudinal direction is opened at one end in the longitudinal direction, a low-pressure water supply port 3 in a direction orthogonal to the longitudinal direction is opened at the other end, and a short cylinder is installed inside the valve box 1. A shaped hollow valve body 4 is slidably fitted, a water passage hole 5 is opened in the middle of the side surface of the valve body 4, and the end surface of the other end of the valve body 4 is opened. A water passage 6 is formed inside the 4.

As shown in FIG. 1, the valve body 1 is provided with a low-pressure sliding piston 11 on the other end side of its outer peripheral surface.
is slidably fitted into the cylindrical portion 1'' formed in the middle of the valve case 1. In this way, the low pressure water receiving surface of the valve body 4 is preferably formed to be larger than the high pressure water receiving surface. .And valve body 1
A high-pressure water introduction sealed chamber 7 is formed inside the valve box 1 between the end face of the one end and the inlet 2, and the water flows when the valve body 4 slides toward the one end. A taper valve 10 for high-pressure water check in the shape of a short hollow cylinder, with a water inlet 8 aligned with the hole 5 opening upward into the sealed chamber 7, and an upper end opened at a taper valve seat 9 formed in the water inlet 8. A high-pressure water introduction hole 13 is provided at the lower end of the side surface of the taper valve 10 to communicate the inside of the taper valve 10 with the sealed chamber 7, and the low-pressure water supply port 3 is connected to the low-pressure water supply port 3. A supply amount regulating valve 12 is provided. In the figure, reference numeral 14 indicates a fitting for mounting the control valve 12, reference numeral 15 indicates a cover of the control valve 12, reference numeral 16 indicates an air vent hole in the cylindrical portion 1'', and reference numeral 17 indicates an elevation of the check tapered valve 10. A guide, 18, a spring for pressing the taper valve 10 onto the taper valve seat 9, 19, a sealing lid for the sealed chamber 7, 20, an airtight gasket, 21, an O-ring, 22
23 is a high-pressure flange for mounting the above-mentioned inlet 2, 24 is a high-pressure water pump, and 25 is the main suction pipe of the pump 24, which supplies low-pressure water of approximately 3 to 4 kg/d. be done. 26 is the main piping for high pressure water (approximately 180 kg/Clt), 27 is the descaling nozzle header, 28 is the high pressure water supply valve (automatic opening/closing valve such as a solenoid valve) of the nozzle header 27, 29 is the high pressure water piping, 30 is low pressure water piping, 31
There is a high pressure water pipeline.

Since the present invention is constructed as described above, high pressure water (approximately 150
~180kg/Ai) When stopping intermittently, low pressure water (approximately 2~180kg/Ai)
To automatically and reliably prevent the generation of vacuum and backflow by automatically replenishing a high-pressure water water supply pipe 31 with 3k9/Ai), and to prevent the generation of air pockets and perform smooth intermittent high-pressure water supply. Furthermore, in the second aspect of the invention, the supply amount of the low-pressure water can be adjusted very easily.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the automatic high-low pressure water switching valve of the present invention;
FIG. 2 is an explanatory diagram showing an embodiment. 1... Valve box, 2... High pressure water inlet, 3
...Low pressure water supply port, 4 ... Short cylindrical hollow valve body, 5 ... Water hole, 6 ... Water flow channel,
7...High-pressure water introduction sealed room, 8...Water inlet,
9...Tapered valve seat, 10...Tapered valve for high pressure water check, 11...Piston for low pressure sliding, 12...Low pressure water supply amount adjustment valve .

Claims (1)

[Claims] 1. A high-pressure water inlet 2 is opened at one end of the valve case 1, a low-pressure water supply port 3 is opened at the other end, and a short cylindrical hollow valve body 4 is installed inside the valve case 1. are slidably fitted together, a water passage hole 5 is opened in the middle of the side surface of the valve body 4, and a water passage hole 5 is opened in the side surface of the other end of the valve body 4 to allow water to pass through the inside of the valve body 4. A water channel 6 is formed, and the valve body 4
A high-pressure water introduction sealed chamber 7 is formed inside the valve box 1 between the end face of the one end and the introduction port 2, and when the valve body 4 slides toward the one end, the water passage hole is closed. A water inlet 8 corresponding to 5 is opened in the sealed chamber 7, and a tapered valve 10 for high pressure water check is aligned with the taper valve seat 9 formed in the water inlet 8, thereby introducing high pressure water into the sealed chamber 7. This automatic high/low pressure water switching valve has a structure in which the taper valve seat 9 and the taper valve 10 are opened by low pressure water when the valve is stopped. 2. The short cylindrical hollow valve body 4 is provided with a low pressure sliding piston 11 on the other end side of its outer peripheral surface, and the low pressure water receiving surface of the valve body 4 is connected to the high pressure water receiving surface on the one end side of the valve body 4. The automatic high/low pressure water switching valve according to claim 1, which is formed larger than the surface thereof. 3 A high-pressure water inlet 2 is opened at one end of the valve case 1, a low-pressure water supply port 3 is opened at the other end, and a short cylindrical hollow valve body 4 is slidably fitted inside the valve case 1. a water passage hole 5 is opened in the middle of the side surface of the valve body 4, and a water passage 6 is formed inside the valve body 4 by opening the end surface on the other end side of the valve body 4; Same valve body 4
A high-pressure water introduction sealed chamber 7 is formed inside the valve box 1 between the end face of the one end and the introduction port 2, and when the valve body 4 slides toward the one end, the water passage hole is closed. A water inlet 8 corresponding to 5 is opened in the sealed chamber 7, and a tapered valve 10 for high pressure water check is aligned with the taper valve seat 9 formed in the water inlet 8, thereby introducing high pressure water into the sealed chamber 7. The automatic high-low pressure water switching valve has the taper valve seat 9 and the taper valve 10 opened by low-pressure water when stopped, and a low-pressure water supply amount adjustment valve 12 on the low-pressure water supply side.