JPS6231236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature-sensitive control valve used in a heat medium circulation circuit of a solar heat collector, a cooling water circuit of a cooling tower, a circuit of a water heater, a liquid fuel supply circuit, etc. It is something.

Conventional configuration and its problems Depending on the temperature of the fluid itself such as heat medium or cooling water,
Temperature-sensitive valves that adjust the flow rate are widely used, but conventionally they have been constructed with a temperature-sensitive element that generates some kind of mechanical displacement depending on the temperature, and a valve body that moves in accordance with the displacement. Figure 1 shows a conventional example used in the hot water supply circuit of an instantaneous water heater (Utility Model Application No. 57-119244)
It is. Here, the pipe 101 has a hot water inlet 102.
A heat sensitive body 105 is supported in the passage on the hot water side, and a shaft 106 projects from the heat sensitive body 105 in a length that changes depending on the temperature. A valve body 107 is fixed to the shaft 106 and corresponds to a fixed valve seat 108 provided in the conduit 101, so that its opening area can be changed. Reference numeral 109 denotes a spring that always keeps the heat sensitive body 105 away from the fixed valve seat 108 and presses it toward the support body 110. These parts constitute a temperature-sensitive control valve 111. Figure 2 shows the circuit of an instantaneous water heater using the valve shown in Figure 1.
12 branches into a heating path 114 that passes through a heat exchanger 113 and a cold water path 115 that bypasses it, and later merges and is supplied to a faucet 117 from a hot water supply path 116 . Then, a temperature-sensitive control valve 111 is provided in the middle of the heating path 114,
A manual adjustment plug 118 is provided in the cold water channel 115.

In this conventional example, when the temperature of the hot water in the heating path 114 rises, the amount of protrusion of the shaft 106 increases, the opening area increases, and the flow rate increases, and when the temperature of the hot water falls, the flow rate decreases. Operate in the direction. Therefore, if the combustion input is constant, the temperature rise is approximately inversely proportional to the flow rate, so the temperature from the heating path 114 is controlled to be approximately constant. As a result, the bypass cold water channel 115
By adjusting the amount of cold water by operating the manual adjustment tap 118, any desired water temperature can be obtained.

In such a temperature-sensitive control valve, there is a delay in response until the heat is transferred to the wax, liquid, or gaseous expanding substance sealed in the temperature-sensitive element 105, and the valve cannot be properly designed unless the design points are selected carefully. There is a risk of causing an oscillation phenomenon in which the circuit closes and opens, and when used in a conventional hot water supply circuit, the temperature response is poor and the usability may be inconvenient. Further, since the temperature sensing element and the valve body are provided in the pipe, the size becomes large, which is inconvenient in terms of mounting.

Technical Problems of the Invention In view of the above points, the present invention aims to provide a compact temperature-sensitive control valve with quick thermal response.
This method utilizes the fact that a reversible shape memory material is formed into a coil shape and the gap between the wires of the coil changes depending on the temperature.

Technical Means of the Invention In order to achieve the above-mentioned object, the present invention provides a parallel-wound coil whose one end is fixed and is made of a reversible shape memory material, and a valve that uses a gap between wires of the parallel-wound coil as a regulating flow path. The temperature-sensitive control valve has a passage and an inner wall of the passage that contacts the outer diameter of the free end when the parallel-wound coil is contracted, and at least one of the valve passages is open in the radial direction of the parallel-wound coil. .

Effects of the Invention With the above configuration, the parallel-wound coil in the flow path receives the temperature directly and matches the fluid temperature very quickly, and since it is a shape memory material, it changes simultaneously to the dimensions when it was pre-memorized. . Since the gap between the parallel-wound coil wires serves as a valve passage, a change in dimensions simultaneously causes a change in the valve passage, thereby regulating the flow rate. In addition, when the parallel-wound coil is contracted, the outer diameter of the free end comes into close contact with the inner wall of the passage, thereby controlling the flow rate leaking from the gap between the free end and the passage wall. Are better. Furthermore, since the coil is parallel-wound, the gaps between the wires narrow evenly during contraction, which is effective in reducing water flow noise.

Description of Examples Next, the present invention will be described in detail based on Examples. FIG. 3 is a vertical sectional view showing the valve in an open state, and FIG. 4 is a vertical sectional view showing the valve in a closed state. here,
Reference numeral 1 denotes a valve housing having an L-shaped flow path, into which a parallel wound coil 4 whose one end 3 is supported by a stator 2 is inserted. This parallel wound coil 4 is made of a shape memory material and expands and contracts in the axial direction depending on the temperature. A valve passage 5 opening in the radial direction of the parallel-wound coil 4 corresponds to a gap 6 between the strands of the parallel-wound coil 4, and fluid flows through this gap 6. Further, the outer diameter of the free end 7 of the parallel wound coil 4 comes into close contact with the passage wall 8 of the housing 1 when contracted as shown in FIG.

Effects of the Embodiment In the above-described embodiment, the parallel-wound coil 4 is made of a reversible shape-memory material, and expands and contracts in the vicinity of the temperature at which it has been memorized in advance. Therefore, the gap 6 changes depending on the temperature of the passing fluid, and the flow rate control effect is achieved by changing the passage area without providing a separate valve body.
Furthermore, since the parallel wound coil 4 is exposed in the flow path, it has a wide contact area with the fluid, and has the effect of extremely quick response to temperature changes.

As is well known, when the length of a parallel-wound coil is contracted, the length also increases slightly in the outer diameter direction.

Therefore, in the embodiment described above, the gaps 6 between the coil wires come into close contact with each other and the passage wall 8 when contracted, so that controllability is excellent from a low flow rate region to a sealed state.

Effects of the Invention Since the present invention uses the gap between the wires of a parallel-wound coil made of a shape memory alloy with one end fixed to adjust the flow path, the response to temperature changes is quick and a separate valve body is not required. This has the effect of reducing the overall size.

For example, this temperature-sensitive control valve can be inserted into a solar heat collection circuit and opened when the temperature reaches a certain level, enabling high-temperature heat collection, or inserted into a cooling tower's cooling water circuit and opened when the temperature reaches a certain level. It is suitable for the purpose of preventing wasteful circulation of cooling water by keeping it closed until the temperature reaches 100 mL, or for stabilizing hot water temperature by fast response by inserting it into the hot water supply circuit as described in the conventional example. Further, the valve is suitable for inserting into a liquid fuel supply path to correct changes in combustion amount caused by changes in viscosity caused by changes in ambient temperature.

Furthermore, it is known that the water flow noise generated during the operation of restricting the flow rate can be reduced as the flow path becomes more segmented. This is effective in reducing noise compared to shaped coils that close sequentially starting from the larger diameter side.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional temperature-sensitive control valve, Fig. 2 is a water circuit diagram of an instantaneous water heater using the valve shown in Fig. 1, and Figs. 3 and 4 are one embodiment of the present invention. It is a sectional view showing an example. 3...One end, 4...Parallel wound coil, 5...Valve passage, 6...Gap between coil wires, 7...Free end, 8
...Aisle wall.

Claims (1)

[Claims] 1. A parallel-wound coil whose one end is fixed and made of a reversible shape memory material, a valve passage whose regulating flow path is the gap between the strands of the parallel-wound coil, and a free end outside when the parallel-wound coil is contracted. A temperature-sensitive control valve having a passage inner wall in contact with a diameter, and at least one of the valve passages opening in a radial direction of a parallel-wound coil.