JP2001041346A - Flow rate adjusting valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To try to not only shorten working time, and enhance efficiency, try to but also simplify working processes, and surely prevent the occurrence of mistakes in connection by electrically and technically connecting a wire made out of a shape memory alloy with a lead wire with no soldering used. SOLUTION: A valve body opening/closing a flow path communicated with an inflow port, is provided for one opening side of a cylindrical main body. The valve body is provided with a wire 7 made out of a shape memory alloy to be expanded/contracted in response to temperature so that the valve body is driven to either one of opening or closing direction, and with a terminal plate 60 wherein both the end parts of the wire 7 twisted around the valve body, are fixed to a portion other than the valve body. A cylindrical wire lead line fixing part 65 is provided, which is squeezed so as to be fixed to the terminal plate 60 together with the wire 7 made out of s shape memory alloy and the lead wire 63.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve, and more particularly, to a terminal connecting structure of a flow control valve.

[0002]

2. Description of the Related Art As shown in FIG. 11, a main body 2 of a flow control valve 1 is formed of a resin or the like into a hollow cylindrical shape, and slits 22 for inserting both ends 7a, 7a of a wire 7 into two places on the outer surface of a lower end. The terminal locking portion 12 provided with a projection is provided. Each terminal locking portion 12 has a role as a wire fixing portion 11 and a role as an electrode terminal for making an electrical connection to the outside. An adjusting internal screw 13b for screwing the base 3 is formed on the inner peripheral surface of the main body 2.

A base 3 having an inflow port 4 is screwed into an opening at the lower end of the main body 2. The base 3 is provided for finely adjusting the opening degree of the valve body 6, and is provided on an outer peripheral surface of the cylindrical portion 3 a with an adjusting external screw 13 screwed with the adjusting internal screw 13 b of the main body 2.
The screw 13b, 13a constitutes an adjusting means 13 for adjusting the position of the main body 2 and the base 3 in the direction of expansion and contraction of the wire 7. A hollow cylindrical inflow portion 62 having an inflow passage 5a is provided on the lower surface of the column portion 3a of the base 3 so as to protrude in the axial direction S of the base 3, and the upper end of the inflow passage 5a is located on the upper surface side of the cylinder portion 3a. The inflow port 4 is connected to a valve hole 16 that is opened at the lower end of the inflow portion 62, and is connected to a tube through which pressure flows. And the groove 80
The position of the valve element 6 with respect to the valve seat 17 can be adjusted by inserting a tool such as a screwdriver into the base and rotating the base 3.

A hollow cylindrical portion 3b projects upward from the outer periphery of the valve seat 17 of the base 3, and a return spring guide portion 14 for guiding the return spring 8 is formed on the outer peripheral surface thereof. A valve body guide surface 23 for guiding the sliding portion 6b of the valve body 6 is formed.

The return spring 8 is composed of a compression coil spring used to extend the wire 7 and urge the valve body 6 in the opening direction. The return spring 8 is provided on the outer peripheral surface of the hollow cylindrical portion 3 b of the base 3. The valve is inserted between the cylindrical portion 3a of the base 3 and the head 6a of the valve body 6 in a state of being inserted between the valve body 6 and the inner peripheral surface of the main body 2. The valve body 6 is caused to return upwardly against the force by which the body 6 is moved downward.

The valve body 6 is made of a non-conductive material and comprises a thin disk-shaped head 6a and a columnar sliding portion 6b, and an O-ring mounting portion 19 provided on the lower end surface of the sliding portion 6b. An O-ring 18 a constituting a sealing member 18 for sealing around the valve seat 17 when the valve is closed is attached to the outer peripheral surface, and a valve shaft 15 is protrudingly provided on the lower surface side of the O-ring mounting portion 19. On the outer surface of the sliding portion 6b of the valve body 6, a plurality of (for example, four) outflow passages 5b are provided for quickly releasing air that has flowed out of the valve hole 16 to the outside.

A concave groove-shaped wire guide portion 24 is formed on the upper surface of the head 6a of the valve body 6, and the groove portions 10a at both ends are formed.
Thus, a wire detachment preventing means 10 for preventing the wire 7 turned to the valve body 6 from coming off the valve body 6 is constituted. Each groove 10a is composed of a pair of guide walls 10b and a guide pin 9a constituting the projection 9, and the guide pin 9a is disposed at a position facing each of the two terminal locking portions 12 of the main body 2. The wire 7 is a shape memory alloy that expands and contracts according to the temperature in order to drive the valve body 6 in the closing direction.
It is made of a linear binary alloy such as an i-Ni alloy or the like, and a handle portion 25 to be hooked on the terminal locking portion 12 is fixed to both ends 7a.

Next, an example of an operation state of the flow control valve 1 will be described. The wire 7 made of a shape memory alloy is elastically soft in a low temperature state where power is not supplied, and is balanced with the spring force of the return spring 8 in a state where the wire 7 is slightly extended from the length before assembly by the spring force of the return spring 8. As shown in FIG. 11, the valve body 6 is stationary with the valve body 6 fully opened, and the air flowing in from the inflow port 4 of the base 3 flows from the inflow path 5 a to the outer peripheral surface of the valve body 6 through the valve hole 16. The gas is exhausted to the atmosphere through the formed outflow channel 5b. In general, PWM control (pulse width control) is performed as control of an apparatus using a shape memory alloy.

Here, when a power supply and a control circuit are connected to the terminal locking portion 12 and a current having a certain duty ratio is supplied, the temperature of the wire 7 is increased by self-heating of the resistance of the wire 7 made of shape memory alloy. Rises to wire 7
Enters a steady state at a certain temperature higher than the low temperature. Since the shape memory alloy wire 7 is stored in a shape memory so as to shrink at a high temperature, the shape recovery force at a high temperature is much larger than the force required to elongate the wire 7 at a low temperature. The body 6 moves downward by overcoming the force of the return spring 8 from the rest position at a low temperature, and stops at a position where both forces are balanced (a position where the opening degree of the valve body 6 becomes smaller). That is, as the temperature of the wire 7 increases, the valve 6
Is pulled toward the base 3 against the spring force of the return spring 8, the distance between the valve shaft 15 of the valve body 6 and the valve seat 17 of the base 3 is reduced, and the opening degree is gradually reduced. When the wire 7 contracts by a certain length and reaches a temperature at which heat generation of the wire 7 and heat radiation to the outside are balanced, the contraction stops, and the opening degree at that time is maintained. In order to further reduce the opening of the valve 6, the duty ratio of the energizing current may be changed so that the on-time of the energizing current pulse is longer and the off-time is shorter. The amount increases,
The temperature of the wire 7 increases, and the amount of shrinkage of the wire 7 can be increased.

On the other hand, when the energization is stopped, the self-heating of the wire 7 disappears, the temperature of the wire 7 is cooled by the surrounding air, the amount of contraction decreases, and the opening of the valve body 6 increases, and finally, The state returns to the state shown in FIG. 11, and the flow control valve 1 is always kept open. As described above, by changing the duty ratio of the PWM control for energizing the wire 7 made of a shape memory alloy, the amount of heat generated by the wire 7 can be changed to continuously control the opening of the valve 6. By appropriately setting the adjustment at the time of assembly and the duty ratio of the PWM control to be energized, the flow control valve 1 can be used as an open / close valve that only opens and closes. In addition, by disposing the wire 7 outside the flow path 5, the distance between the valve body 6 and the base 3 can be shortened, so that the total length of the flow control valve 1 can be shortened.

[0011]

However, conventionally, as a means for fixing the wire 7 made of a shape memory alloy to the main body 2, as shown in FIG.
, And a washer 61 is mounted thereon so as to sandwich the wire 7, and the three parts consisting of the washer 61, the wire 7, and the terminal plate 60 are crushed and fixed by rivets 62 to form a terminal portion 69, and further formed in this manner. Terminal part 6
9, a lead wire (not shown) was soldered, and finally the terminal portion 69 and the main body 2 were fixed by screws. In such a conventional method, many parts are required to fix the wire 7 made of a shape memory alloy, and the work process is complicated and takes a lot of time. In addition, there is a danger that the shape memory alloy wire 7 will be overloaded when soldering the terminal portion 69 and the lead wire, and the shape memory may be lost. There is also a problem that the lead wire may be cut off, and the lead wire may come off due to a soldering mistake. In addition, the number of fixing errors of the shape memory alloy wire 7 (the error of the shape memory alloy wire 7 being largely displaced from the center of the terminal plate 60) increases, and in such a case, when the wire 7 is attached to the main body 2, In addition, the wire 7 made of a shape memory alloy is fixed while being deviated from the axial driving direction A of the valve 6 (FIG. 12). Therefore, when the valve element 6 is energized and the valve element 6 is moved, no force is applied in parallel with the axial drive direction a of the valve element 6, so that the sliding resistance of the valve element 6 adversely affects the flow rate adjustment. is there. Further, depending on how to assemble, there is also a problem that the wire 7 made of a shape memory alloy comes into contact with the main body 2 and the wire 7 radiates heat to reduce the displacement of the valve body 6 and adversely affect the flow rate adjustment. .

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to connect a wire made of a shape memory alloy and a lead wire to a terminal board by a conventional soldering method. Electrical and mechanical connection without the need for mounting, shortening the working time and improving efficiency, reducing the number of parts, simplifying the working process, and It is an object of the present invention to provide a flow control valve which can surely prevent a connection error in which a wire made of a memory alloy is fixed with a large deviation from the center of a terminal plate and can smoothly control a flow.

[0013]

According to the present invention, there is provided a base 3 having an inflow port 4 housed at one opening side of a substantially cylindrical main body 2, and a base 2 having a main body 2 provided with an inlet 4. A valve body 6 that is housed at the other opening side and opens and closes a flow path communicating with the inflow port 4, and a shape that expands and contracts according to temperature in order to drive the valve body 6 in either the opening direction or the closing direction. A memory alloy wire 7 and a return spring 8 for extending the wire 7 to urge the valve body 6 in either the opening direction or the closing direction, and the wire 7 is disposed outside the flow path A flow control valve in which both ends 7a of the wire 7 turned to the valve body 6 are electrically and mechanically connected to a terminal plate 60 fixed to a portion other than the valve body 6; A cylindrical wire 60 fixed by caulking together with the wire 7 made of a shape memory alloy and the lead wire 63 is provided. And characterized by comprising providing a chromatography leads fixed portion 65, in such a configuration,
By caulking the cylindrical wire / lead wire fixing portion 65, the wire 7 and the lead wire 63 can be electrically and mechanically connected to the terminal plate 60 easily and in a short time. No soldering work is required, and the adverse effects of soldering (such as losing the shape memory of the wire 7 made of shape memory alloy, or using the lead wire 63 from the root of the solder during use after assembly)
There is no possibility that the lead wire 63 will come off due to soldering mistakes, and stable work can be ensured. Further, the cylindrical wire / lead wire fixing portion 65 makes it possible to form a shape memory alloy. The connection error that the wire 7 is largely shifted and fixed from the center of the terminal plate 60 can be reliably prevented, the sliding resistance of the valve body 6 can be minimized, and the flow rate can be smoothly adjusted.

The terminal plate 60 is provided with a lead wire coating portion 6.
Lead wire covering portion fixing portion 66 for caulking and fixing 3b
In this case, when the lead wire covering portion fixing portion 66 is crimped, stress can be prevented from being applied to the wire portion 63a and the wire 7 made of the shape memory alloy from the lead wire.

It is preferable that the wire / lead wire fixing portion 65 and the lead wire covering portion fixing portion 66 can be simultaneously caulked and fixed. In this case, stress is not applied to the wire 7 made of a shape memory alloy. Meanwhile, the working process can be shortened.

It is preferable that the terminal plate 60 is fixed to the main body 2 by heat sealing. In this case, the terminal plate 60 can be easily and securely fixed to the main body 2, and furthermore, another terminal such as a screw is used. No parts are needed.

Preferably, the main body 2 is provided with terminal plate positioning means for regulating the position of the terminal plate 60 in the rotational direction m and the axial direction n.
Can be alleviated to the terminal fixing pins 64 and the like that fix the pins.

A wire protection groove 6 provided in the main body 2
It is preferable that the wire 7 is housed in the wire 7. In this case, the wire 7 made of a shape memory alloy can be sufficiently protected against an impact from an external force.

The wire 7 is preferably fixed to the wire / lead fixing portion 65 at a position where it does not come into contact with the main body 2. In this case, when the terminal plate 60 is attached to the main body 2, the wire 7 is made of a shape memory alloy. The wire 7 can be prevented from touching the main body 2 and dissipating heat to the main body 2.

It is preferable that the terminal plate 60 is attached to the main body 2 so that the wire / lead wire fixing portion 65 and the lead wire coating portion fixing portion 66 face the main body 2 side. With the lead wire fixing portion 65 and the lead wire coating portion fixing portion 66 facing inward, the terminal plate 6
It does not protrude beyond 0.

It is preferable that the terminal plate 60 and the main body 2 are connected to each other via a reinforcing member 68. In this case, even when an external impact (for example, a drop impact) is applied, the reinforcing member 68 is used. The terminal plate 60 can be less likely to be stressed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

As shown in FIG. 11, the flow control valve according to the present embodiment comprises a base 3 having an inflow port 4 housed on one opening side of a substantially cylindrical main body 2 and another opening of the main body 2. A valve body 6 housed on the side and opening and closing a flow path communicating with the inflow port 4, and a shape memory alloy made of a shape memory alloy that expands and contracts according to temperature to drive the valve body 6 in either the opening direction or the closing direction. Wire 7
And a return spring 8 that expands the wire 7 and urges the valve body 6 in either the opening direction or the closing direction, and the wire 7 is disposed outside the flow path, Both ends 7 a of the wire 7 turned to the valve body 6 are electrically and mechanically connected to a terminal plate 60 fixed to a portion other than the valve body 6. The structures such as the base 3, the valve element 6, and the return spring 8 are the same as those in the related art (FIGS. 11 to 13), and the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

The main body 2 of the flow control valve is formed of a non-conductive material such as a resin into a hollow cylindrical shape. On the outer peripheral surface of the lower end portion of the main body 2 (on the side of the inflow port 4 in the assembled state), 180
Two terminal fixing pins 64 (FIG. 2) are protrudingly provided at positions apart from each other, and each terminal fixing pin 64 has a terminal plate 60 for fixing both ends 7a of the wire 7 made of a shape memory alloy. Installed.

The terminal plate 60 is formed by caulking and fixing the wire 7 made of a shape memory alloy so that both ends 7 of the wire 7 are fixed.
a, and has a role as an electrode terminal for making an electrical connection to the outside via the lead wire 63. The terminal plate 60 is shown in FIG.
As shown in FIG. 5, the terminal plate 60 includes a wire / lead wire fixing portion 65 formed of a cylindrical metal tube that can be fixed by caulking together with the wire 7 made of a shape memory alloy and the lead wire 63. Here, terminal plates 60 are arranged at both ends 7a of the tubular wire / lead wire fixing portion 65, respectively.
0, the end of the wire 7 made of a shape memory alloy is inserted into the inside of the wire / lead fixing portion 65 from above, and the lead wire 63 is inserted into the inside of the wire / lead fixing portion 65 from above the other terminal plate 60. End portion (here, the stranded wire portion 63
a) is inserted.

Thus, the end of the wire 7 made of shape memory alloy is inserted from one end of the cylindrical wire / lead wire fixing portion 65 provided on the terminal plate 60, and the wire portion 63a is inserted from the other end of the lead wire. Then, by caulking the wire / lead wire fixing portion 65, the wire 7 and the lead wire 63 can be electrically and mechanically connected to the terminal plate 60. In other words, by caulking the wire / lead wire fixing portion 65 in the direction of arrow F1 in FIG. 1, the wire portion 63a and the wire 7 made of a shape memory alloy can be connected and made conductive by the lead wire. Work is unnecessary,
The working time can be reduced and the efficiency can be improved.

Further, by a method of caulking and fixing the wire / lead wire fixing portion 65 provided integrally with the terminal plate 60,
The wire 2 made of shape memory alloy and the lead wire 63 are connected to the main body 2.
Can be reliably and easily connected to the wire, so that many parts are not required for fixing the wire 7 made of a shape memory alloy as in the related art, the number of parts can be reduced, and the work process can be simplified. Work time can be greatly reduced. Further, by omitting the conventional soldering, the wire 7 and the lead wire 63 can be connected and conducted without applying a thermal load to the wire 7 made of the shape memory alloy, and therefore, the adverse effect of the soldering, that is, There is no risk of losing the shape memory of the wire 7 made of a shape memory alloy or of the lead wire 63 being cut off from the root of the solder during use after assembling. Stable work can be secured.

Further, the terminal plate 60, the lead wire 63 and the wire 7 made of a shape memory alloy can be arranged in parallel with each other by the cylindrical wire / lead wire fixing portion 65. Since the lead wire fixing portion 65 is fixed by caulking, it is possible to reliably prevent a connection error in which the wire 7 made of a shape memory alloy is fixed with a large deviation from the center of the terminal plate 60. Therefore, when the terminal plate 60 is attached to the main body 2, there is no fear that the wire 7 made of the shape memory alloy is fixed while being shifted from the axial driving direction A of the valve body 6.
When the valve body 6 is moved by energization, a force is applied in parallel with the axial drive direction A of the valve body 6. Thereby, the sliding resistance of the valve body 6 can be minimized, and there is an advantage that the flow rate can be smoothly adjusted.

FIGS. 3 and 4 show a case in which the lead wire covering portion 63b is caulked and fixed to a lead wire covering portion fixing portion 66 different from the wire / lead wire fixing portion 65. FIG. Other configurations are the same as those in FIG. 2 and only different points will be described. In this example, a cylindrical lead wire coating fixing portion 66 is provided coaxially with the wire / lead fixing portion 65 at an end opposite to the one end where the wire / lead fixing portion 65 is provided on the terminal plate 60. It is. Then, the lead wire covering portion 63b is inserted into the lead wire covering portion fixing portion 66, and the wire portion 63a from the lead wire is inserted into the wire / lead wire fixing portion 65.
By caulking in the F2 direction, connection work can be performed at the same time. Thus, when the lead wire covering portion fixing portion 66 is crimped, stress is not applied to the wire portion 63a and the wire 7 made of a shape memory alloy from the lead wire, so that the wire 7 made of a shape memory alloy and the lead wire 63 are protected. Meanwhile, the wire 7 and the lead wire 63 can be coupled and conducted with high reliability. Further, since a force can be simultaneously applied to the wire / lead wire fixing portion 65 and the lead wire coating portion fixing portion 66 to caulk both at the same time, the work can be performed while applying no stress to the wire 7 as described above. The number of steps can be reduced, and productivity can be improved.

FIG. 5 shows a case where the terminal plate 60 is fixed to the main body 2 by heat sealing. Other configurations are the same as those of the embodiment of FIG. 4, and only different points will be described. In this example, when fixing the terminal plate 60 to which the wire portion 63a, the lead wire covering portion 63b, and the wire 7 made of a shape memory alloy are fixed to the main body 2, the terminal fixing pins 64 are connected to the terminal plate 60.
The terminal plate 60 can be easily and reliably fixed to the main body 2 by heat sealing in accordance with the fixing groove. Therefore, separate parts such as screws are not required, and the fixing operation is simple, and the productivity is improved.

FIG. 6 shows a case where the main body 2 is provided with terminal plate positioning means for regulating the position of the terminal plate 60. Other configurations are the same as those of the embodiment of FIG. 5, and only different points will be described. The terminal plate positioning means of the present embodiment rotates the terminal plate 60 when fixing the terminal plate 60 to which the wire portion 63a, the lead wire covering portion 63b, and the wire 7 made of a shape memory alloy are fixed to the main body 2. And a pair of rotation holding plates 96 and a pair of axial holding plates 95 for preventing displacement in the axial direction n. Here, the pair of rotation holding plates 96 are opposed to each other in a direction orthogonal to the axial direction n of the terminal plate 60.
The terminal plate 60 is prevented from rotating by being in surface contact with the sides, and the pair of axial holding plates 95 sandwich the lead wire covering portion 63b from both sides to hold the terminal plate 60 only in the axial direction n. This can prevent the terminal plate 60 from being displaced from the main body 2 in the rotational direction m and the axial direction n, respectively. Is reduced, and stable characteristics of the flow control valve can be obtained.

FIG. 7 shows a case where a wire protection groove 67 for accommodating the wire 7 is provided in the main body 2. Other configurations are the same as those of the embodiment of FIG. 6, and only different points will be described. The wire protection groove 67 is desirably provided over the entire length of the main body 2. In this example, when fixing the terminal plate 60 to which the wire portion 63a, the lead wire covering portion 63b, and the wire 7 made of shape memory alloy are fixed to the main body 2, the protruding portions are protruded from both sides of the main body 2 shown in FIG. By storing the wire 7 made of a shape memory alloy in the provided wire protection groove 67, the wire 7 made of a shape memory alloy can be protected against an impact from an external force, and the characteristics of a stable flow control valve can be obtained. And a wire 7 made of a shape memory alloy.
Is changed by heat, so that it can be hardly affected by external heat such as air convection, and the characteristics of the shape memory alloy wire 7 can be more optimally maintained.

FIG. 8 shows a state where the wire 7 made of a shape memory alloy is not in contact with the main body 2 and the wire / lead wire fixing portion 65
Shows the case where it is fixed to. Other configurations are the same as those of the embodiment of FIG. 4, and only different points will be described. In this example, when fixing the terminal plate 60 to which the lead stranded wire portion 63a, the lead wire covering portion 63b and the shape memory alloy wire 7 are fixed to the main body 2, the shape memory alloy wire 7 is connected to the lead wire. The wire / lead wire fixing portion 65 is fixed by caulking over the wire portion 63a. As a result, when the terminal plate 60 is attached to the main body 2, the wire 7 made of shape memory alloy comes to a position sufficiently distant from the main body 2. Can be prevented from being radiated to the valve body 6.
Can be prevented from decreasing, and the flow rate adjustment can be prevented from being adversely affected.

FIG. 9 shows a case where the terminal plate 60 is attached to the main body 2 with the wire / lead wire fixing portion 65 and the lead wire coating fixing portion 66 facing the main body 2. Other configurations are the same as the embodiment of FIG.
Only the differences are described. In this example, the stranded wire 6
When fixing the terminal plate 60 to which the 3a, the lead wire covering portion 63b, and the wire 7 made of a shape memory alloy are fixed to the main body 2,
The wire / lead wire fixing portion 65 and the lead wire covering portion fixing portion 66 are fixed toward the inside of the main body 2 (center side of the main body 2). As a result, the wire / lead wire fixing portion 65 and the lead wire covering portion fixing portion 66 are turned inward and the terminal plate 60
As a result, the external appearance is improved and the structure can be reduced in size. Further, since the wire / lead wire fixing portion 65 and the lead wire covering portion fixing portion 66 are fixed inside the main body 2, the wire / lead wire fixing portion 65 and the lead wire covering portion fixing portion 66 can be protected from external impact. And a structure resistant to external impacts (for example, drop impacts).

FIG. 10 shows a case where the terminal plate 60 and the main body 2 are connected to each other via a reinforcing member 68. Other configurations are the same as those of the embodiment of FIG. 2, and only different points will be described. In this example, when fixing the terminal plate 60 to which the lead stranded wire portion 63a, the lead wire covering portion 63b, and the wire 7 made of shape memory alloy are fixed to the main body 2, the terminal plate 6 of the main body 2 is fixed.
A reinforcing member 68 is provided at a portion to which 0 is attached. The reinforcing member 68 has a cylindrical shape that surrounds the base 3, so that stress is not easily applied to the terminal plate 60 in the event of an external impact (for example, a drop impact), and a stable flow rate adjustment is possible. The characteristics of the valve can be obtained.

[0036]

As described above, according to the first aspect of the present invention, the base having the inflow port accommodated in one opening side of the substantially cylindrical main body, and the base accommodated in the other opening side of the main body. And a valve made of a shape memory alloy that expands and contracts according to temperature in order to drive the valve in either the opening direction or the closing direction. A return spring that extends to urge the valve body in either the opening direction or the closing direction, wherein the wire is disposed outside the flow path, and both ends of the wire turned to the valve body are the valve body. A flow control valve electrically and mechanically connected to a terminal plate fixed to a portion other than the above, wherein a cylindrical wire fixed to the terminal plate together with a shape memory alloy wire and a lead wire.・ Since a lead wire fixing part is provided, a cylindrical wire / lead wire By caulking the tough, a wire and a lead wire easily and in a short time with respect to the terminal plate,
Electrical and mechanical connection can be made, and conventional soldering work is not required, so that working time can be reduced and efficiency can be improved. Also, many parts are not required to fix the shape memory alloy wire, the number of parts can be reduced, the work process can be simplified, the work time can be greatly reduced, and no soldering is performed So
No heat load is applied to the shape memory alloy wire, and there is no adverse effect (such as loss of shape memory of the shape memory alloy wire or breakage of the lead wire from the root of the solder during use after assembly). In addition, a stable work can be ensured without a problem such as a lead wire coming off due to a soldering error. Furthermore, by the tubular wire and lead wire fixing part,
Since the terminal plate, the lead wire, and the wire made of the shape memory alloy can be arranged in parallel to each other, it is possible to reliably prevent a connection error in which the wire made of the shape memory alloy is fixed with being largely displaced from the center of the terminal plate. Therefore, when the terminal plate is attached to the main body, there is no fear that the wire made of the shape memory alloy is fixed by being shifted from the axial driving direction of the valve body. A force is applied in parallel with the driving direction. Thus, the sliding resistance of the valve body can be minimized, and the flow rate can be smoothly adjusted.

According to a second aspect of the present invention, in addition to the effect of the first aspect, the terminal plate includes a lead wire covering portion fixing portion for caulking and fixing the lead wire covering portion.
When caulking the lead wire fixing part, it is possible to prevent stress from being applied to the wire part and the shape memory alloy wire from the lead wire, so that the wire and the lead wire are protected while protecting the shape memory alloy wire and the lead wire. Can be coupled and conducted with high reliability.

According to the third aspect of the present invention, in addition to the effect of the second aspect, since the wire / lead wire fixing portion and the lead wire coating portion fixing portion can be simultaneously caulked and fixed, the shape memory alloy is provided. The work process can be shortened while preventing stress from being applied to the product wire, and productivity can be improved.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect, the terminal plate is fixed to the main body by heat sealing, so that the terminal plate can be easily and reliably fixed to the main body. In addition, no separate parts such as screws are required, the fixing work is simple, and the productivity is improved.

According to a fifth aspect of the present invention, in addition to the effects of the first or fourth aspect, a terminal plate positioning means for regulating the position of the terminal plate in the rotational direction and the axial direction is provided on the main body. Because of the provision, the stress on the terminal fixing pins 64 and the like fixing the terminal plate can be reduced, and stable characteristics of the flow control valve can be obtained.

According to a sixth aspect of the present invention, in addition to the effect of the first aspect, since the wire is housed in the wire protection groove provided in the main body, the shape memory alloy made of a shape memory alloy against an impact from an external force. The wire can be adequately protected and stable flow control valve characteristics can be obtained.In addition, the shape memory alloy wire changes due to heat, so it is affected by external heat such as air convection. Can be difficult,
The characteristics of the shape memory alloy wire can be further optimized.

According to the seventh aspect of the present invention, in addition to the effect of the second aspect, since the wire is fixed to the wire / lead wire fixing portion at a position not in contact with the main body, the terminal plate is attached to the main body. Sometimes, the wire made of shape memory alloy can be placed at a position far enough away from the main body, and it can be prevented that the wire made of shape memory alloy touches the main body and is radiated to the main body. Can be prevented from being reduced, and the flow rate adjustment is not adversely affected.

According to an eighth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the wire / lead wire fixing portion and the lead wire covering portion fixing portion are directed toward the main body. Since the terminal plate is attached to the main body, the wire / lead wire fixing portion and the lead wire coating fixing portion are directed inward and do not protrude outside the terminal plate, so that the appearance is improved and In addition, the structure can be reduced in size, and the wire / lead wire fixing portion and the lead wire coating fixing portion can be protected from external impact.

According to the ninth aspect of the present invention, in addition to the effect of the first aspect, since the terminal plate and the main body are connected to each other via the reinforcing member, an external impact (for example, a drop impact) is prevented. Even when it is applied, it is possible to make it difficult for stress to be applied to the terminal plate by the reinforcing member, and to obtain stable characteristics of the flow control valve.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a state where the terminal board is attached to a main body.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a sectional view of still another embodiment.

FIG. 5 is a perspective view of still another embodiment.

FIG. 6 is a perspective view of still another embodiment.

FIG. 7 is a perspective view of still another embodiment.

FIG. 8 is a sectional view of still another embodiment.

FIG. 9 is a perspective view of still another embodiment.

FIG. 10 is a perspective view of still another embodiment.

FIG. 11 is a conventional sectional view.

FIG. 12 is a conventional perspective view.

FIG. 13 is an exploded perspective view of the related art.

[Explanation of symbols]

 2 Body 3 Base 4 Inlet 6 Valve 6 Wire 8 Return spring 60 Terminal plate 63 Lead wire 63a Lead twisted wire portion 63b Lead wire coating portion 65 Wire / lead wire fixing portion 66 Lead wire coating fixing portion 67 Wire protection Groove 68 Reinforcement member

Continued on the front page (72) Inventor Takahiro Kurihara 1048 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. Inventor Tomohiro Kami 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. DD13 EE10 FC05

Claims (9)

[Claims] 1. A base having an inflow port accommodated in one opening side of a substantially cylindrical main body, and a valve element accommodated in the other opening side of the main body and opening and closing a flow path communicating with the inflow port. A wire made of a shape memory alloy that expands and contracts according to temperature in order to drive the valve body in one of the opening direction and the closing direction, and the other in either the opening direction or the closing direction by expanding the wire And a return spring biasing the wire, the wire is disposed outside the flow path, and both ends of the wire turned to the valve body are electrically and mechanically connected to a terminal plate fixed to a portion other than the valve body. A flow control valve connected to the terminal plate, wherein the terminal plate is provided with a tubular wire / lead wire fixing portion which is fixed by caulking together with a shape memory alloy wire and a lead wire. Control valve. 2. The flow control valve according to claim 1, wherein the terminal plate includes a lead wire covering portion fixing portion for caulking and fixing the lead wire covering portion. 3. The flow control valve according to claim 2, wherein the wire / lead wire fixing portion and the lead wire coating portion fixing portion can be simultaneously caulked and fixed. 4. The flow control valve according to claim 1, wherein the terminal plate is fixed to the main body by heat sealing. 5. The flow control valve according to claim 1, wherein the main body is provided with terminal plate positioning means for regulating the position of the terminal plate in the rotation direction and the axial direction. 6. The flow control valve according to claim 1, wherein a wire is housed in a wire protection groove provided in the main body. 7. The flow control valve according to claim 2, wherein the wire is fixed to the wire / lead wire fixing portion at a position not in contact with the main body. 8. The terminal according to claim 1, wherein the terminal plate is attached to the main body such that the wire / lead wire fixing portion and the lead wire coating portion fixing portion face the main body. A flow control valve according to any of the above. 9. The flow control valve according to claim 1, wherein the terminal plate and the main body are connected to each other via a reinforcing member.