JPS6179085A - Freezing preventing valve - Google Patents

Abstract

PURPOSE:To prevent fluid from being stagnated when temperature of liquid falls to the specified temperature at which fluid will start freezing by shaping a coiled spring, which impacts a valve body against a valve seat, out of bidirectionary-type from memorizing alloy. CONSTITUTION:A coiled spring 18 is shaped out of bidirectionary from memorizing alloy which memorizes a form that will be shrinked or expanded at the specified temperature. A valve body 19 is made to impact against a valve seat 13 by the resilient force of said coiled spring 18. When ambient temperature is reduced below the specified temperature, at the approximate value of which fluid will be freezed, the coiled spring 18 which is made of bidirectionary-type form memorizing alloy will be shrinked or expanded into a form which the alloy has memorized at low temperature. The coiled spring then have the valve body automatically impact against or separated from the valve seat, whereby preventing fluid inside piping of being stagnated.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is applicable to water pipes and water heater piping, as well as pumps and This relates to an antifreeze valve for preventing damage to processing facilities, and is configured to automatically shut off or open a flow path at a temperature at which the fluid freezes.

(Prior art) As a conventional method for preventing damage to water pipes due to freezing, first, wrap Styrofoam, heat insulation tape, etc. around water pipes to reduce the temperature drop of water in the pipes and prevent water from freezing. There are ways to prevent water pipe damage. In addition, we installed two main valves in the water pipe, shut off the main valve on the primary side, and
There is a way to release all the water in the piping by opening the main/<lube on the next side.

Furthermore, there is a way to prevent water from freezing by opening the water valve and letting a small amount of water flow continuously so that the water does not stagnate.

In addition, as a method for preventing freezing and damage to water heater piping, there is a method of keeping the water heater warm by using a heater.

Another method is to provide a low-temperature release valve that detects changes in volume due to freezing of water in pipes using pressure and releases fluid.

(Problems to be Solved by the Invention) The conventional damage prevention method described above, in which water pipes are wrapped with polystyrene foam, heat insulating tape, etc., lacks certainty in preventing damage because the water in the water pipes freezes when the temperature drops sharply. . In addition, the method of operating two main valves and the method of continuing to flow water have a problem in that the time and effort required to operate the valves is complicated. Furthermore, the method of keeping the water heater warm with a heater requires electric heating of about 200 W, which is not economical, and the equipment is also expensive. The method of providing a low-temperature release valve has the problem that the sensing device is complicated and expensive.

An object of the present invention is to provide an antifreeze valve that automatically opens and closes the valve when the liquid temperature drops to a set temperature at which the fluid starts to freeze, thereby preventing fluid from stagnation or discharging the fluid from piping. I hold back what I do.

(Means for Solving the Problem) In order to achieve this object, the present invention provides a valve that blocks a flow path by abutting a valve body against a valve seat with the elasticity of a coil spring, the coil spring being heated to a set temperature. The valve body is made of a two-way shape memory alloy that is memorized in a shape that contracts or expands at the temperature, and the valve body is separated from or brought into contact with the valve seat by contraction or expansion of the coil/spring at the set temperature, and the flow The gist is that the system is configured to connect or block the path.

(Function) When the temperature drops to near the temperature at which the fluid freezes, the coil spring made of two-way shape memory alloy deforms into the memorized contraction or expansion shape with this temperature as the set temperature, and the valve seat The valve is opened and closed by abutting or separating the valve body.

Therefore, the fluid in the piping does not stagnate, or
The fluid in the pipe is released, and damage caused by freezing of the fluid in the pipe can be prevented. When the temperature rises, the coil spring returns to its original shape and functions as a valve.

(Description of Examples) Examples of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing an example in which the antifreeze valve of the present invention is applied to a globe valve, and FIG. 2 is a diagram showing a water sprinkling piping installation that is an example of the use of the antifreeze W valve shown in FIG. 1. FIG.

In the watering piping equipment shown in Fig. 2, a water conduit 3 is connected to the water main l via a main valve 2, and the tip of this water conduit 3 is branched into a plurality of branches, each with one at the tip of each school. A water pipe 6 provided with a large number of water sprinkling holes 5 is connected via an AfM valve 4 . When watering, the main valve 2 is opened and each of the primary control valves 4 is appropriately opened to adjust the amount of water discharged from the watering holes 5. In addition, when water is not sprinkled, the main valve 2 and the control valve 4 are
are both blocked. Therefore, when the temperature drops and the water in the pipes freezes, the water conduit pipe 3 whose both ends are shut off by the main valve 2 and the control valve 4 is likely to be damaged. As a method to prevent this damage, open the main valve 2 and open the 31-section valve 4 slightly to allow a small amount of water to constantly flow out from the water sprinkling hole 5.
Either prevent the water in the water pipe 3 from stagnating and freezing, or shut off the main valve 2 and open only the control valve 4 to drain the water in the water pipe 3. No.

Therefore, in order to save the trouble of operating the main valve 2 and g1 saving valve power saving 4 as described above, it would be beneficial to have a freeze prevention 1F valve that automatically opens or closes the valve when the liquid temperature drops to a predetermined temperature. be. The present invention provides such an antifreeze valve, and its structure will be explained below with reference to FIG. 1.

10 is a globe valve, and instead of the Am valve 4, the high pressure JR path is connected to the water conduit 3, and the low pressure flow path is connected to the water conduit 6&. Then, a leak hole 12 is bored in the partition wall 11 that separates the high pressure flow path and the low pressure flow path, and this leak hole 12
A valve seat 13 is formed on the high-pressure flow path side, and a plug hole 15 is formed in the valve body 14 of the globe valve 10 at a position facing the valve seat 13. This plug hole 15 is provided with a screw 16, into which a screw plug 17 is screwed. A coil spring 18 is disposed on this screw-in plug 17, and a valve body 13 that abuts against a valve seat 13 is disposed at the tip of the coil spring 18. The threaded plug 17 is provided with a driver groove 20 that adjusts the elasticity of the coil spring 18. Further, the coil spring 18 is formed of a two-way shape memory alloy so that the set temperature is near 0 degrees, where water freezes, and the low temperature memory shape is a contracted shape and the high temperature memory shape is an expanded shape. .

Here, to briefly explain about bidirectional shape memory alloys, "Nikkei Mechanical J, 1.
09-11? As described in the page, the shape of high-temperature austenite and the shape of low-temperature martensite are memorized, and the shape of high-temperature austenite and low-temperature martensite are repeatedly operated by temperature changes due to heating and cooling. It is a shape memory alloy with a two-way shape memory effect.

Next, the operation of the antifreeze valve of the present invention will be explained. At room temperature of 0 degrees or higher, the coil spring 18 has a high-temperature austenite shape, and the elasticity of the coil spring 18 causes the valve body 1 to
9 is abutted against the valve seat 13, and the leak hole 12 is closed. For this reason, normal opening/closing control of the control valve 4 is performed by operating the globe valve 10, and when the globe valve IO is shut off, the fluid is stagnant. Here, when the temperature decreases and the liquid temperature reaches the martensitic transformation start temperature of the coil spring 18, the coil spring 18 begins to contract its length, the temperature further decreases, and the set temperature of the martensitic transformation end temperature is reached. When it reaches , it stops shrinking and transforms into the memorized shape at a low temperature. For this purpose, the valve body 19 is connected to the valve seat 13.
The leak hole 12 connects the high pressure flow path and the low pressure flow path, and the fluid that has been blocked by the globe valve IO flows out through the leak hole 12 to the low pressure flow path. As a result, even when the globe valve 1o is in the shut-off state, the water in the water pipe 3 flows, and the water pipe 3 can be prevented from being damaged due to freezing. Then, when the liquid temperature rises due to the rise in temperature, the coil spring 18 begins to stretch at the austenite transformation start temperature and deforms into a high temperature shape again, the valve body 19 abuts against the valve seat 13 and the leak hole 12 is closed. Functions as a normal globe valve lO. Therefore, the leak hole 12 is automatically controlled to open or close depending on the liquid temperature. Note that the elasticity of the coil spring 18 can be adjusted by appropriately adjusting the screw-in depth of the screw-in plug 17 depending on the water pressure.

FIG. 3 is a diagram showing another embodiment of the antifreeze valve of the present invention. It is installed in the water conduit 3 shown in Fig. 2 to drain water from the water conduit 3 at a set temperature.

The short connecting pipe 23 with the connecting screw 22 carved in it is styled 2.
1, a drainage hole 24 with a valve seat 25 formed on the inner wall side is bored in the body 21, and a plug hole 26 is further formed in the wall opposite to the valve seat 25. A screw 27 is formed in this plug hole 26, and the screw-in plug 2
8 are screwed together. A coil spring 29 is disposed in this screw-in plug 28, and a valve body 30 that abuts against the valve seat 25 is disposed at the tip of the coil spring 29. The coil spring 29 is made of a two-way shape memory alloy so that the set temperature is near 0 degrees, where water freezes, and the low temperature memory shape is a contracted shape and the high temperature memory shape is an expanded shape. .

Thus, at room temperature, the valve body 3 is placed on the valve seat 25 of the drain hole 24.
0 collide with each other due to the elasticity of the coil spring 28, and the drain hole 24
is occluded. Then, when the temperature decreases and reaches the martensitic transformation start temperature of the coil spring 28, the coil spring 29 contracts its length and transforms into a low temperature memorized shape, separating the valve body 30 from the valve seat 25. Drain hole 24 is opened. For this purpose, the fluid flows out from the water pipe 3 to which the short connection pipe 23 is connected through the drain hole 24.
It is possible to prevent the water in the water pipe 3 from freezing and damaging the water pipe 3. Then, when the liquid temperature rises, the coil spring 29 begins to expand at the austenite transformation starting temperature.
The valve body 30 is deformed into a high temperature memorized shape, and the valve body 30 abuts against the valve seat 25, and the drain hole 24 is closed.

FIG. 4 is a diagram showing still another embodiment of the antifreeze valve of the present invention. The high-pressure flow path is connected to the main valve 2 in Fig. 2, with the high-pressure flow path facing the main valve 2 and the low-pressure flow path facing the water conduit 3, so that the main valve 2 side is automatically shut off at low temperatures, and the flow is conducted. The water pipe 3 is designed to drain water.

A main valve seat 33 is formed on the low-pressure flow path side of the communication hole of the partition wall 32 of the valve 31, and a plug hole 35 is bored at a position of the valve body 34 facing the main valve seat 33. 36
is engraved, and a screw-in plug 37 is screwed into the hole.

Further, a valve seat plug 39 having a leak hole 38 communicating with the outside is screwed into this threaded plug 37. A small valve seat 40 is provided on the flow path side of this valve seat plug 39. Further, a main valve element 41 is provided facing the main valve seat 33 and positioned on the screw-in plug 37, and a small valve element 42 facing oppositely to the main valve element 41 is integrated with the main valve element 41. The main valve body 41 is formed facing the seat 40. The main valve body 41 is connected to the main valve seat 33 by a first coil spring 43.
When the coil spring is separated, the small valve body 42 is biased in the direction of contraction of the coil spring so as to abut against the small valve seat 40.

The first coil spring 43 is formed of a two-way shape memory alloy so that the frozen temperature of the fluid is set as a set temperature, and the memory shape at a low temperature is an expanded shape and the memory shape at a high temperature is a contracted shape. In addition, 44.45 is an O-ring, and 4B is a guide sleeve.

Therefore, in normal times when the temperature is above the liquid temperature or the freezing temperature,
The 19th coil spring 43 is in a contracted shape, and the partition wall 32
The flow hole is open and the flow path is in communication. Then, when the temperature decreases and reaches the martensitic transformation start temperature, which is between liquid and freezing temperatures, the first coil spring 43 expands its length and deforms into a low temperature memorized shape, and the main valve body 4
1 abuts against the main valve seat 33 of the partition wall 32 to block the flow path. At the same time, the small valve body 42 is separated from the small valve seat 40, the leak hole 38 communicates with the outside of the valve 31, and the fluid on the low pressure flow path side of the valve 31 is discharged through the leak hole 38. Note that by providing the guide sleeve 46, the main valve body 4
The main valve body 41 can be quickly seated on the valve body 33 by the reaction force of the discharge of the wave body received when the small valve body 42 opens. Therefore, when the temperature is low, the high-pressure flow path side can be automatically shut off, and the water can be drained from the low-pressure flow path side.

FIG. 5 is a diagram showing another embodiment in which the antifreeze valve shown in FIG. 4 is further improved. Components that are the same as those in FIG. 4 are given the same reference numerals and redundant explanations will be omitted.

A second leak hole 50 is formed in the partition wall 32 of the valve 31, and a second small valve seat 51 is provided on the high pressure flow path side of the second leak hole 50.
is formed. A second plug hole 5 in which a screw 52 is carved in a position opposite to this second small valve seat 51 in the valve body 34
3 is bored, and a second threaded plug 54 is screwed into this second plug hole 53. Further, a second coil spring 55 is disposed on the second screw plug 54, and a second small valve body 5 is attached to the tip of the second coil spring 55.
6 are arranged. This second coil spring 55 has a set temperature that is slightly lower than the set temperature of the first coil spring 43, and is of a two-way type so that the low temperature memory shape is an expanded shape and the high temperature memory shape is a contracted shape. Made of shape memory alloy. Reference numeral 57 denotes a guide pin consisting of a plurality of rod-shaped bodies provided in place of the guide sleeve 46 in FIG. 4, and serves to guide the movement of the main valve body 41.

Thus, when the main valve element 41 is seated, the pressure difference becomes large between the high-pressure flow path and the low-pressure flow path of the partition wall 32, making it difficult to seat the main valve element 41. After the main valve body 41 is seated, the second leak hole 5 is opened by stretching the second coil spring 55.
0 to completely close the partition wall 32.

In addition, in the above embodiment, the coil spring 18.29
．． First coil/henne 43 and second coil spring 55
has shown a structure in which the valve bodies 19, 30, the main valve body 41, and the second small valve body 56 are moved individually, but the structure is not limited to this, and the operation time and the Of course, the amount of elongation, elasticity, etc. may be supplemented as appropriate. In addition, the set temperature of the coil spring is
As in the above embodiment, the temperature is not limited to around 0 degrees, but may be set appropriately depending on the freezing temperature of the liquid to be handled.

(Effects of the Invention) As explained above, the antifreeze and valve according to the present invention are made of a two-way shape memory alloy in which a coil spring is memorized into a shape that contracts or expands at a set temperature, and the elasticity of the coil spring Since the valve body is aligned with the valve seat,
When the temperature drops below the set temperature near the temperature at which the fluid freezes, the coil spring made of two-way shape memory alloy automatically contracts or expands to the shape memorized at low temperature. The valve body is brought into contact with or separated from the valve seat to open and close the valve, and the fluid in the piping does not stagnate, or the fluid in the piping is released to prevent damage due to freezing of the fluid in the piping. If this can be prevented and the temperature rises, the coil spring will return to its original shape memorized at high temperature.
Although it functions as a normal valve and has a simple structure, it has excellent effects such as not requiring manual operation.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment in which the anti-freezing valve of the present invention is applied to a globe valve, and FIG. 2 is a diagram showing an example of the use of watering piping equipment, which is an example of the use of the anti-freezing valve shown in FIG. 1. FIG. 3 is a diagram showing another embodiment of the antifreeze valve of the present invention, and FIG. 4 is a diagram showing another embodiment of the antifreeze valve of the present invention. It is a figure showing still another example of the antifreeze valve of the present invention,
FIG. 5 is a diagram showing another embodiment in which the antifreeze valve shown in FIG. 4 is further improved. 12, 38: Leak hole, 13, 25: Valve seat, 1
8.29: Coil spring, 1], 30: Valve body, 24:
Drain hole, 32: Partition wall, 33: Main valve seat, 40: Small valve seat,
'41: Main valve body, 42: Small valve body, 43: First coil spring. Figure 1 Figure 2 Figure 3 Figure F8 Figure 4 Figure 5

Claims (1)

[Claims] 1. A two-way valve that blocks a flow path by abutting a valve body against a valve seat with the elasticity of a coil spring, the coil spring being memorized in a shape that contracts or expands at a set temperature. It is characterized in that it is made of a shape memory alloy, and configured such that the valve body is separated from or brought into contact with the valve seat by contraction or expansion of the coil spring at the set temperature, thereby communicating or blocking the flow path. Antifreeze valve. 2. A main valve seat is formed on the low-pressure flow path side of the partition wall provided inside the flow path, and a main valve body is arranged so as to face this main valve seat and abut against each other by the expansion of a coil spring, and this main valve A small valve body facing in the opposite direction is integrally formed with the body, and a leak hole in which a small valve seat with which the small valve body abuts is formed is bored to communicate with the outside of the flow path, and the coil spring is made of a two-way shape memory alloy that is memorized into a shape that expands at a set temperature, and the expansion of the coil spring at the set temperature causes the main valve body to abut against the main valve seat, thereby blocking the flow path. With,
An antifreeze valve characterized in that the small valve body is separated from the small valve seat so that the low pressure flow path side leaks from the leak hole to the outside of the flow path.