JPH074999U - Automatic drain valve - Google Patents

Abstract

(57) [Summary] [Purpose] The spring pressure acting on the valve body can be adjusted. [Structure] A drain valve 1 comprises a valve body 2, a valve body 3 and a spring 4 for opening and closing the valve body 3. The valve body 2 has an inflow port 5 and an outflow port 6 at both ends, and forms a valve seat 11 therein. The valve body 3 has a pressure receiving surface 20 that is in close contact with the valve seat 11, and the pressure receiving surface 20 and the partition plate 13
A spring 4 for opening and closing the valve main body 2 is interposed between and. The partition plate 13 is screwed into a female screw portion 17 formed at the inflow port 5, and is screwed so as to be able to move back and forth within the range of the female screw portion 17. [Effect] When the partition plate 13 is loosened, the spring 4 is loosened and the spring constant is reduced. On the contrary, when the partition plate 13 is rotated in the tightening direction, the set length of the spring is increased and the spring constant is also increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic water drain valve that is attached to an end of a snow melting pipe or the like to automatically drain residual water in the snow melting pipe.

[0002]

[Prior art]

 As a drainage valve of this type, in Japanese Utility Model Laid-Open No. 3-48200, a valve body having a pressure receiving surface is provided in the valve body, and when water flows into the valve body, the water pressure causes the valve body to resist a spring. Residual water is automatically discharged by pushing the valve body back by a spring when the water pressure flowing into the valve body weakens and the water pressure drops, and the valve seat formed inside the valve body stops water. An automatic drain valve configured to do so has been proposed.

[0003]

[Problems to be solved by the device]

 A conventional automatic water drain valve opens and closes a valve body by the water pressure of water flowing into the valve body, and controls the valve body by a spring in the valve body. By the way, the spring pressure acting on the valve body is calculated by previously calculating the water pressure of the water flowing into the valve body, that is, the water pressure received by the valve body according to the diameter of the pipe connected to the drain valve and the ability of the pump supplying water. , The spring set to the spring pressure corresponding to that value is used. However, when constructing for snow removal, for example, an error will occur between the water pressure drained from the snow removal pipe connected to the drain valve and the water pressure at the time of design. If the pressure is weak and the spring pressure is stronger than the water pressure, the valve will not close and there is a risk of water leakage. Further, in the conventional example, the spring pressure acting on the valve element cannot be adjusted, so it is necessary to replace the spring with a spring corresponding to the water pressure. In addition, such an error between the water pressure drained from the snow-melting pipe and the spring pressure is not limited to the time of construction, but the snow-melting pipe or the pump may deteriorate due to deterioration of the snow-melting pipe or pump during use. When replaced, the water pressure discharged from the snow-melting pipe will of course change, and every time the snow-melting pipe or pump is replaced, a troublesome work such as replacing the spring with a water pressure is necessary.

The present invention is intended to solve such a problem, and provides an automatic drain valve capable of adjusting the spring pressure of the drain valve according to the water pressure of the water discharged from the pipe. To aim.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a valve body having a valve chamber inside and opening an inlet and an outlet at both ends, a valve seat formed in the valve chamber toward the inlet, A valve body having a pressure receiving surface facing the valve seat and capable of coming into contact with and separating from the valve seat, a partition plate having a water passage hole provided at the outflow port, and a space between the partition plate and the valve body. And a spring for urging the valve element in the opening direction, and the partition plate is screwed into the outflow port so that the partition plate can move forward and backward in the valve chamber.

[0006]

[Action]

 In the automatic water drain valve of the present invention, when the pump operates, water flows from the inlet into the valve chamber of the valve body, and when a predetermined value of water pressure is applied to the pressure receiving surface of the valve body, the valve body is resisted against the spring. When the valve moves to the valve seat side and the valve seat and the valve body come into close contact with each other, the valve body closes and water is stopped. After this, when the water pressure of the water flowing into the valve body decreases due to the stop of the pump, the valve body is pushed back by the spring, the valve seat and the valve body are separated, and the residual water in the valve body flows. Drained from the outlet. Then, when the partition plate screwed to the outflow port is rotated in the direction of loosening, the spring loosens, the spring constant becomes small, and the spring closes even if the water pressure is low. Conversely, if the partition plate is rotated in the tightening direction, the set length of the spring will increase and the spring constant will also increase, so it will not close unless the water pressure is high. In this way, the spring pressure acting on the valve body can be adjusted by moving the partition plate forward and backward to the valve chamber.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 3 show an embodiment of the present invention. A drain valve 1 is a cylindrical valve body 2 made of, for example, stainless steel or cast iron, and a valve body 3 built in the valve body 2. A spring 4 for opening and closing the valve body 3 is a main component. The valve body 2 has an inflow port 5 and an outflow port 6, both ends of which are opened, and an outer peripheral surface thereof is formed in a taper shape so as to gradually widen toward the outflow port 6 from the inflow port 5. A flat-sided hexagonal tool hook 7 for hooking a tool such as a wrench is provided to the side of the lower end of the outer peripheral surface so as to project laterally. In addition, an inner peripheral surface 8 that linearly penetrates is formed inside the valve body 1, and a valve chamber 9 is formed in a space surrounded by the inner peripheral surface 8. A step portion 10 is provided so as to project toward the axial center of the valve body 1 in the middle of the inner peripheral surface 8. The step portion 10 has an end portion on the inlet port 5 side from the step portion 10 to the inner peripheral surface. A tapered valve seat 11 is formed continuously with the surface 8. Further, a front plate 12 is screwed on the inner peripheral surface of the inflow port 5 of the valve body 2, while a partition plate 13 for supporting the spring 4 is screwed on the inner peripheral surface of the outflow port 6. A plurality of water passage holes 14 and 15 are formed in both the front plate 12 and the partition plate 13, and female screw portions 16 and 17 provided on the inner peripheral surfaces of the inflow port 5 and the outflow port 6 are provided on the outer peripheral surface thereof. The mating male screw parts 18 and 19 are formed.

The valve body 3 has a pressure receiving surface 20 formed in a flat plate shape with a gap in the circumferential direction between the valve body 3 and the inner peripheral surface 8, and the valve seat formed at the peripheral edge of the back surface of the pressure receiving surface 20. The taper surface 21 is formed in a conical shape corresponding to the reference numeral 11, and the shaft portion 22 protruding from the center of the back surface of the pressure receiving surface 20 is formed into a substantially T-shaped cross section. The valve body 3 has a shaft portion 22 inserted into a guide cylinder portion 23 protruding from the center of the partition plate 13, and a pressure receiving surface 20 and a cylinder portion 24 protruding from the center of the front plate 12. It is housed in the valve body 2 so as to be positioned between the valve seat 11 and the front plate 12 with a gap.

The spring 4 built in the valve body 1 is interposed between the partition plate 13 and the pressure receiving surface 20 of the valve body 3 so as to cover the guide cylinder 23 of the partition plate 13, and is disposed between the valve body 3 and the valve body 3. Is urged in the opening direction, that is, in the direction in which the valve seat 11 and the tapered surface 21 of the valve body 3 separate from each other. Further, the lower end portion of the spring 4 for urging the valve body 3 is supported by a partition plate 13 screwed to the outflow port 6, but the outflow port 6 screwed with the partition plate 13 is provided. As shown in FIG. 2, the female screw portion 17 is formed from the lower end portion of the valve body 1 shown in the figure to the step portion 10, and the thickness T of the partition plate 13 is different from the length L thereof. The partition plate 13 is formed so as to be thin and within the range of the length L of the female screw portion 17, and the partition plate 13 is screwed into the valve chamber 9 so as to be able to advance and retract. Therefore, if the partition plate 13 is rotated clockwise (direction of arrow A shown in FIG. 2) and tightened, the partition plate 13 moves to the back side as shown by the alternate long and short dash line in FIG. The partition plate 13 can be moved to the front side by turning it counterclockwise and loosening the partition plate 13.

The water drain valve 1 configured as described above is mainly used for snow removal, and the snow removal pipe 27 is screwed into the female screw portion 25 formed on the outer peripheral side of the inflow port 5 to flow the snow. A drain pipe 28 is screwed into the female screw portion 26 formed on the outer peripheral side of the outlet 6. Then, by the operation of a snow-melting pump (not shown), the snow-melting water flows from the snow-melting pipe 27 into the valve body 2, and the pressure-receiving surface 20 of the valve body 3 has a water pressure of, for example, 1.5 kg / cm ² . As shown by the alternate long and short dash line in FIG. 1, the valve body 3 moves into the valve body 2 against the spring 4, and the valve seat 11 and the tapered surface 21 of the valve body 3 come into close contact with each other. The valve body 3 closes. Therefore, water can be sprinkled from a snow-melting nozzle (not shown) connected to the snow-melting pipe 27. When the pressure of the snow-melting water flowing into the valve body 2 is lowered by stopping the snow-melting pump (not shown), the valve body 3 is pushed back by the spring 4, and as shown by the solid line in FIG. , The valve seat 11 and the tapered surface 21 of the valve body 3 are separated from each other, and the residual water in the snow melting pipe 27 leaves the valve chamber 9 through the gap between the pressure receiving surface 20 of the valve body 3 and the inner peripheral surface 8 of the valve body 2. The water is drained from the drainage pipe 28 to a side groove (not shown) through the water passage hole 15 of the partition plate 13 and the outflow port 6.

By the way, the valve body 3 is controlled so as to close against the spring 4 when a water pressure of a predetermined value is applied, and to be opened by the spring 4 below a predetermined value. It is set based on the inflow water pressure. However, if the spring pressure is stronger than the water pressure, or if it is used for a long period of time, these may be replaced due to a defective snow removal pipe 27, snow removal pump, or scale sticking. In the case of weakening, there is a risk that the valve body 3 will not be fully closed and water leakage will occur. Conversely, if the spring pressure is weak against water pressure, there is a risk that the valve body 3 will not open.

As described above, when there is an error between the snow-melting water flowing into the valve body 2 and the spring pressure of the spring 4 for controlling the opening and closing of the valve body 3, when the spring pressure is stronger than the water pressure, In the present invention, as shown by the alternate long and short dash line in FIG. 2, if the partition plate 13 supporting one end of the spring 4 is loosened, the spring 4 loosens and the spring constant becomes smaller. Even if is low, the valve seat 11 and the tapered surface 21 of the valve body 3 come into close contact with each other against the spring 4 and close. Thereby, it is possible to reliably stop the water and prevent water leakage. If the spring pressure set against the water pressure is weak, conversely tightening the partition plate 13 (as shown by the solid line to the alternate long and short dash line in FIG. 2) will increase the set length of the spring 4 and also the spring constant. Since the valve body 3 becomes large, the valve body 3 does not open, and the spring 4 can be instantly returned to stop the residual water by stopping the snow-melting pump (not shown).

As described above, in the present invention, the partition plate 13 supporting one end of the spring 4 is screwed into the valve chamber 9 so as to be able to move forward and backward, whereby the spring pressure acting on the valve body 3 is arbitrarily adjusted. In addition, the adjustment work can be easily done by simply rotating the partition plate 13 in any direction and moving the partition plate 13 back and forth. It is extremely easy to make adjustments without the hassle of doing so.

The present invention is not limited to the above-mentioned embodiment, and various modifications can be made. For example, although the valve body has a substantially straight tubular shape, it may be appropriately set depending on its shape or material such as a valve body bent in an L shape. In addition to the snow-melting pipe, it can be widely applied to domestic water supply.

[0016]

[Effect of device]

 According to the present invention, a valve body having a valve chamber inside and opening an inlet and an outlet at both ends, a valve seat formed in the valve chamber toward the inlet, and facing the valve seat. A valve body having a pressure receiving surface that can be brought into and out of contact with the lever seat, a partition plate having a water passage hole provided at the outflow port, and a valve plate interposed between the partition plate and the valve body. A spring for urging the valve element in the opening direction is provided, and the partition plate is screwed to the outlet so as to be movable back and forth in the valve chamber, so that the water pressure is adjusted according to the water pressure discharged from the pipe. An automatic drain valve that can adjust the spring pressure of the drain valve can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an adjusting operation of the valve body of the above.

FIG. 3 is an exploded perspective view of the same drain valve.

[Explanation of symbols]

 1 Drain valve 2 Valve body 3 Valve body 4 Spring 5 Inlet 6 Outlet 9 Valve chamber 11 Valve seat 13 Partition plate 15 Water hole

Claims (1)

[Scope of utility model registration request] 1. A valve body having a valve chamber inside and having an inflow port and an outflow port opened at both ends, a valve seat formed in the valve chamber toward the inflow port, and facing the valve seat. A valve body having a pressure receiving surface that can be brought into and out of contact with the valve seat, a partition plate having water passage holes provided at the outflow port, and the valve body interposed between the partition plate and the valve body. And a spring for urging the valve in the opening direction, and the partition plate is screwed into the outflow port and provided in the valve chamber so as to be movable back and forth.