JP2000154511A - Valve for drain of snow thawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve for drain of a snow thawing device capable of closing the valve at the same time when water is fed into a pipe for thawing snow by a pump, opening the valve at the same time when the pump is stopped, and realizing automatic opening and closing of the valve and having high reliability without causing a trouble. SOLUTION: A valve for drain of a snow thawing device consists of a combination of cylindrical valve main body 1 in which a male screw connected with a pipe for water distribution of the snow thawing device protrudes at one end, a cylindrical discharge port 2 screw-fitted in the other end, and a spherical valve element 3. A idle motion chamber 10 in which the valve element 3 rolls freely so as not to escape is provided in the valve main body 1, and a valve seat 15 which the valve element 3 is driven is formed so as to expand by thawing snow water pressure from the pipe P at one end of a drain passage 13 of the discharge port 2 in the combination of the valve main body 1 and the discharge port 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain valve attached to the end of a pipe of a snow removal device.

[0002]

2. Description of the Related Art There are two types of snow removal systems using water in roads, gardens, etc., in which there is a method of spraying water simultaneously from nozzles arranged on the road surface or the like, and a method of circulating warm heat through piping buried under the road surface. In any case, it is necessary to remove the water (drain) in the piping in order to prevent breakage due to freezing when the operation is stopped, etc., so a drain valve is connected to the end or halfway of the piping. You.

[0003] A check valve in which a valve body is urged to open by a coil spring is used as a conventional drain valve of this type. According to this, the valve body closes against the elasticity of the coil spring by the pressure of the water sent when the operation of the snow removal device is started, and the snow removal device is activated, and when the operation is stopped, As the water pressure decreases, the valve body opens due to the elasticity of the coil spring, and the drain is discharged.

[0004]

According to the above-mentioned conventional drain valve, the coil spring is rusted, and dust or water residue is caught on the coil spring by use of poor quality water. Malfunctions occur, which hinders the normal operation of the snow removal device and the drain discharge.

[0005] Further, since the valve is closed by water pressure, the water is not immediately stopped by the momentum of the water sent by the pump after the start of operation, but the power relationship between the coil spring and the water pressure is not increased. Therefore, since the valve is gradually closed in proportion to the water pressure, the water for snow removal is wastedly discharged during that time. Conversely, even if the operation is stopped, draining the drain takes time because the valve is gradually opened, and in the severely cold region, it causes freezing during that time. Therefore, it is desirable that the drain be removed as soon as possible at the same time as the operation is stopped.

Further, there has been a problem that the coil spring rusts, and dust or water residue from incomplete filtration, particularly when lake water is used, is caught, thereby causing problems in opening and closing the valve. In addition, there has been a problem that the elasticity of the coil spring changes with time, and the coil spring does not function properly at the time of snow removal.

The present invention has been made in view of the above-described circumstances,
The valve closes as soon as water is pumped into the snow removal pipe, and the valve opens when the pump stops, so that it opens and closes automatically and has a reliable and trouble-free drain valve for the snow removal system. The purpose was to provide.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cylindrical valve body having a male screw protruding at one end connected to a water distribution pipe of a snow removal device, and a screw at the other end. The valve body comprises a combination of a cylindrical discharge port to be attached and a spherical valve body. In the combination of the valve body and the discharge port, a floating chamber is provided in the valve body so that the valve body can freely roll so that it cannot escape. At one end of the drainage passage, the valve seat into which the valve body runs was formed in an expanded shape by the water pressure of snow removal from the pipe to constitute a drain valve of the snow removal device.

According to the above configuration, when the snow removal device is in an operation stop state, the valve body sinks to the bottom of the idle chamber. Due to the momentum, the valve body runs up to the valve seat and immediately closes the drain passage, so that the snow removal device is activated. Also,
When the operation is stopped, the water pressure in the floating chamber drops, the valve body immediately falls from the valve seat, and the drain passage is opened, so that the residual water (drain) of the snow removal device is discharged.

The inner diameter of the male screw of the valve body is formed to be smaller than the inner diameter of the floating chamber by a step, and a screwdriver is sandwiched between the valve body and the discharge port on opposing side surfaces of the outer periphery of each end. The provision of the notch simplifies the structure and facilitates assembly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the material of a valve body 1, a discharge port 2, and a valve body 3 is not particularly limited, such as metal and plastic. In the case of a large scale, it is desirable that the valve body 3 is made of metal such as steel which is heavy enough to be released from the valve seat 15 against the water pressure of the drain.

Further, the valve body 1 and the discharge port 2 are not limited to cylindrical shapes, and in particular, the outer peripheral surface may be a polygon such as an octagon.

[0013]

As described above, according to the drain valve of the snow removal apparatus of the present invention, it is necessary to remove the drain in order to close the snow removal apparatus at the same time as the start of the operation and open it at the same time as the stop. In addition, since there is no trouble in opening and closing the valve, troubles due to freezing of the drain can be conveniently prevented beforehand, and since the structure is simple without using a spring, it is suitable for inexpensive provision. Of course, there is no problem that the valve body is clogged with dirt or water scum, and the maintenance and management become easy.

[0014]

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

The drawings show one embodiment, in which a drain valve V of a snow removal device is made of a steel valve body 1.
, A discharge port 2 and a spherical valve element 3.

The valve body 1 has a cylindrical shape connected to a pipe P at the end of the snow removal device, and has a male screw 5 connected to the pipe P with a small diameter at one end and a discharge port 2 screwed at the other end. A female screw 7 is formed. In the inside, the inside diameter of the male screw 5 is made smaller than that of the valve body 3 by providing an inclined step 9 near the male screw 5. The space between the discharge port 2 and the step 9 is a floating chamber 10 in which the valve element 3 freely rolls.

The outlet 2 has a cylindrical shape with a smaller diameter than the valve body 1 and has an external thread 11 formed at one end thereof on the outer periphery for screwing to the valve body 1. Further, the discharge passage 13 as the inside of the cylinder is formed smaller than the valve body 3 and the idle chamber 1
The valve seat 15 is provided there by forming the opening to 0 obliquely enlarged.

FIG. 1 shows a state of use, in which a drain 1
The drain valve P is attached by penetrating and fixing the valve body 1 to the side wall 19 of 7, and the discharge port 2 projects into the drain groove 17. When the snow removal device is stopped, the valve element 3 has fallen into the floating chamber 10 as shown by the solid line in FIG.

When the snow removal device is operated, the pipe P
Due to the force of the water pushed out from the nozzle, the valve body 3 seals the valve seat 15 toward the discharge port 2 so that water is blown out from the nozzle of the snow removal device, and the water is used to remove snow. When the operation is stopped, the force pressed by the water is lost, so that the valve body 3 falls down into the idle chamber, the drain passage 13 is opened, and the water remaining in the snow melting device is discharged to the drain groove 17.

Since the valve body 1 and the discharge port 2 are assembled by screwing, notches 21 and 22 for hooking a screwdriver are provided on both sides facing each other. Further, since the discharge port 2 protrudes from the side wall 19, if a trouble such as clogging of dust occurs, the notch 2 is formed.
The discharge port 2 can be easily removed and processed by using the discharge ports 2 and 22.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a drain valve of a snow removal device according to the present invention in use.

FIG. 2 is an exploded perspective view of the drain valve.

[Explanation of symbols]

 V Drain valve for snow removal equipment P Piping 1 Valve body 2 Outlet 3 Valve body 5 Male screw 9 Step 10 Idling chamber 13 Drainage passage 15 Valve seat 21, 22 Notch

Claims (2)

[Claims] 1. A combination of a cylindrical valve body having a male screw protruding at one end connected to a water distribution pipe of a snow removal device, a cylindrical discharge port screwed to the other end, and a spherical valve body. In the combination of the valve body and the discharge port, a floating chamber is provided in the valve body in which the valve body freely rolls so that it cannot escape. A drain valve for a snow removal device, characterized in that a valve seat into which the rush runs is formed in an expanded shape. 2. A cutting device in which the inner diameter of the male screw of the valve body is formed smaller than the inner diameter of the floating chamber by a step, and a screwdriver is inserted between the valve body and the discharge port on opposing side surfaces of the outer periphery of each end. 2. The drain valve according to claim 1, further comprising a notch.