JPH063273Y2 - Automatic drain valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an automatic drain valve which is attached to an end of a pipe to automatically discharge residual water and the like.

(Prior Art) Conventionally, as shown in Japanese Utility Model Laid-Open No. 63-27528, an on-off valve is provided at the end of a snow-melting pipe equipped with a water spray nozzle, and by opening this on-off valve. ,
The residual water in the pipe is drained to the outside to prevent the pipe from being damaged due to freezing in severe cold.

As an opening / closing valve mainly for such drainage,
According to Japanese Patent Laid-Open No. 82649, a bottomed cylindrical valve element supported by a coil spring is provided inside a valve body provided in a water discharge pipe and a discharge side pipe, and water flows into the valve body from the discharge pipe side. Then, due to the water pressure of the water, the valve body is brought into close contact with the valve seat in the valve body against the biasing force of the coil spring to stop water, and at the time when the water supply from the discharge side piping side is stopped, An automatic drainage valve for anti-freezing of fire trucks has been proposed in which a valve body is separated from a valve seat by a coil spring to drain residual water. Further, Japanese Utility Model Laid-Open No. 165227/53 opens and closes an outlet in a valve body. There has been proposed an automatic drainage device in which an opening / closing plate is rotatably supported so as to be rotatable, and a coil spring that constantly urges the opening to open the outlet is interposed between the outlet and the opening / closing plate.

(Problems to be solved by the invention) In the former automatic drainage valve for freeze prevention, the valve body is merely supported by the coil spring in a floating manner, and there is no special means for guiding the valve body itself. Therefore, when water pressure is applied to the valve body and the valve body moves to the valve seat side, the valve body is likely to be in an unstable state such as tilted, and there is a risk that the valve body will not stick to the valve seat and cause water leakage. is there. Further, in the latter automatic drainage device, one end of the opening / closing plate is pivotally supported by the support shaft and rotates like a pendulum around the support shaft, so that the opening / closing plate draws an arc locus and is stable on the valve seat side. Although it is movable, the opening / closing plate is pivotally supported in the valve body.Therefore, when assembling this opening / closing plate, the support shaft must be pivotally supported on the opening / closing plate from the outside of the valve body while holding the opening / closing plate in the valve body. In addition, the opening and closing plate, which cannot be seen directly, needs to be pivotally supported from the outside of the valve body, which is a very troublesome work, resulting in poor assembly workability.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and provide an automatic drain valve capable of stably moving to the valve seat side without rattling of the valve element, and moreover, the valve element can be easily assembled. And

(Means for Solving the Problems) The present invention has a valve body having an inflow port and an outflow port at both ends and forming a valve seat toward the inflow port, and a valve provided in the valve body. A body, a partition wall formed at the outflow port, a communication hole provided in a peripheral portion of the partition wall, and a coil spring provided in the valve body and biasing the valve body so as to separate from the valve seat. A pressure receiving portion that is formed to have a smaller diameter than the inner peripheral surface of the inflow water passage that extends from the inflow port to the valve seat, and that can be in close contact with the valve seat facing the valve seat; A valve rod protruding from the central portion of the back surface, a through hole for slidably guiding the valve rod in the axial direction is formed in the partition wall, and the valve spring is provided with the coil spring in the through hole. And a retaining member is provided on the tip side of the valve rod.

(Operation) When water flows into the valve body from the inlet and water pressure is applied to the pressure receiving portion of the valve body, the valve body moves against the coil spring. At this time, the shaft rod of the valve element slides axially along the through hole of the partition wall, the valve element moves stably to the valve seat side, and finally comes into close contact with the valve seat to stop water. Then, when water supply to the valve body is stopped and the water pressure applied to the pressure receiving portion gradually weakens, the valve body is pushed back along the through hole in the direction away from the valve seat by the biasing force of the coil spring, and the pressure receiving portion When the water pressure applied to the valve is unpressurized, the retaining member on the tip side of the valve rod abuts and is held against the partition wall, and the residual water in the valve body is discharged to the outside from the outflow port through the communication hole of the partition wall. It

(Embodiment) Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a tubular valve body, and this valve body 1 has a tubular valve body one side portion 3 made of a stainless steel material having an inflow port 2 at one end thereof, and a tubular valve body made of a stainless steel material at the other end thereof. Side 4
One end of the valve body is screwed, and a tapered valve seat 5 is formed on one end side of the other side portion 4 of the valve body.
A partition wall 7 having a communication hole 6 that communicates the inside and the outside is formed at the other end of the partition wall 7. An inflow water channel 8 from the inflow port 2 to the valve seat 5 is formed, and an outflow water channel 10 from the valve seat 5 to the discharge port 9 is formed. 11 is the valve seat 5
Is a valve body made of a stainless material, which is provided on the side of the inflow port 2 so as to face the valve. The valve body 11 has a substantially frustoconical shape, and the portion abutting on the valve seat 5 is slid. In addition, a flat pressure receiving portion 12 is formed on the inlet 2 side. The valve rod 13 is provided on the side of the outflow channel 10 of the valve body 11.
The valve rod 13 has a tip 14 side which is inserted into a through hole 15 formed at the center of the partition wall 7, and a grooved nut 16 which is a retaining member is screwed to the tip 14. At the same time, the split pin 17 is inserted to prevent it from coming off. Reference numeral 18 is a coil spring made of a stainless material interposed between the valve body 11 and the partition wall 7.
Both ends 18A and 18B are connected to the valve body 11 and the partition wall 7,
1 is urged to move away from the valve seat 5.

Next, the operation of the above configuration will be described.

When water pressure of, for example, 1.5 kg / cm to 2.0 kg / cm is applied from the side of the pipe 19 connected to the inflow port 2 side by the operation of a pump (not shown), the water pressure is applied to the pressure receiving portion 12, and therefore the valve body 11 As shown by the alternate long and short dash line, the coil spring 18 abuts against the valve seat 5 to stop the water. Further, when the water pressure on the pipe 19 side decreases with the stop of the pump or the like, the total pressure applied to the pressure receiving portion 12 is inferior to the elastic force of the coil spring 18, and therefore the valve body 11 is separated from the valve seat 5, so that the inside of the pipe 19 The residual water is discharged to the outside from the outflow port 9 through the inflow water channel 8 and the outflow water channel 10.
This water is drained to a gutter (not shown).

As described above, in the above embodiment, the valve seat 5 is attached to the valve body 1.
And the valve body 11 is provided on the side of the inflow water passage 8 of the valve seat 5, and the coil spring 18 is connected to the valve body 11 so as to separate the valve body 11 from the valve seat 5. , When the water pressure exceeds a certain value, the valve body 11 automatically abuts the valve seat 5 to stop water, and when the water pressure falls below a certain value, the coil spring
The valve body 11 is automatically separated from the valve seat 5 by the valve 18, and the valve body 1 communicates with the outside through the discharge port 9. For this reason the pipe
The residual water in 19 is discharged to the outside, so that it is possible to prevent the pipe 19 from being damaged due to freezing in severe cold, etc., without any human intervention.

Further, in the above-described embodiment, the coil spring 18 is externally mounted on the valve rod 13 projecting from the back surface of the pressure receiving portion 12, and the valve rod 13 is inserted into the through hole 15 provided in the partition wall 7 to form a valve body. The valve rod 13 of 11 is guided by the through hole 15 provided in the partition wall 7,
When water pressure is applied to the valve body 11, the valve body 11 moves stably to the valve seat 5 side without rattling, and the valve body 11 surely comes into close contact with the valve seat 5, so that there is no risk of water leakage. Further, the valve body 11 is assembled to the valve body 1 in a state where the valve body 1 side portion 3 is detached from the valve body other side portion 4 and the coil spring 18 is externally mounted on the valve rod 13 to partition the valve rod 13. It can be assembled very simply by inserting it into the through hole 15 of the wall 7 and tightening the grooved nut 16 at the tip of the valve rod 13.

Moreover, since the pressure receiving portion 12 of the valve body 11 is formed toward the inflow port 2, the higher the water pressure is, the larger the total pressure in the pressure receiving portion 12 is. It responds promptly to and has excellent responsiveness.

The present invention is not limited to the above-described embodiment, and for example, packing may be provided on the valve seat so that the valve body abuts on this packing. Further, although the inflow water channel and the outflow water channel are shown in a straight line in the above embodiment, the outflow water channel may be arranged in an L shape with respect to the inflow water channel. Although explained, it can also be used for pipes connected to wells.

(Effect of the Invention) The present invention has a valve body having an inflow port and an outflow port at both ends and forming a valve seat toward the inflow port therein, a valve body provided in the valve body, and A partition wall formed in the outlet, a communication hole provided in a peripheral portion of the partition wall, and a coil spring provided in the valve body and biasing the valve body away from the valve seat, The valve body is formed to have a diameter smaller than that of the inner peripheral surface of the inflow water passage extending from the inflow port to the valve seat, and the pressure receiving portion can be closely attached to the valve seat so as to face the valve seat. The partition wall is formed with a through hole for guiding the valve rod slidably in the axial direction, and the valve rod for covering the coil spring is inserted into the through hole. By providing a retaining member on the tip side of the valve rod, the valve body can be stably moved to the valve seat side without rattling. Also, it is possible to provide an automatic water drain valve that can easily assemble the valve body.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view, FIG. 2 is a front view, and FIG. 3 is a side view. 1 ... Valve main body 2 ... Inflow port 3 ... Outflow port 5 ... Valve seat 6 ... Communication hole 7 ... Partition wall 8 ... Inflow channel 10 ... Outflow channel 11 ... Valve element 12 ... Pressure receiving section 13 ... Valve 15 ... Through hole 16 ... Grooved nut (prevention member) 18 ... Coil spring

Claims (1)

[Scope of utility model registration request] 1. A valve main body having an inflow port and an outflow port at both ends and forming a valve seat toward the inflow port, a valve body provided in the valve main body, and a valve body formed in the outflow port. And a partition wall
The partition wall is provided with a communication hole and a coil spring which is provided in the valve body and biases the valve body so as to separate the valve body from the valve seat. The pressure receiving portion is formed to have a smaller diameter than the inner peripheral surface of the inflow water passage leading to and comes into close contact with the valve seat facing the valve seat, and a valve rod protruding from the center of the back surface of the pressure receiving portion. The partition wall has a through hole that guides the valve rod so that the valve rod can slide in the axial direction, and the valve rod that covers the coil spring is inserted into the through hole to prevent the valve rod from slipping off at the tip end side. An automatic water drain valve characterized by having a member.