JP2007002988A - Control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control valve for stabilizing the property of a cylinder/piston unit so that gas spring holding force or general action during operation, which strongly depend on a temperature, do not depend on the temperature. <P>SOLUTION: During the contraction of the cylinder/piston unit 1, compressed gas in a lead-in gas storage chamber 6 moves to a lead-out gas storage chamber 5 through a gas flow path 11 of a piston circumferential portion, a piston ring groove 8 and an annular gas flow path 12 in a piston in the routes of arrowmarks b1, b2, b3. During elongation of the unit, the compressed gas in the lead-out gas storage chamber 5 moves into the lead-in gas storage chamber 6 through the annular gas flow path 12 and a valve seat flow path 19 in the routes of arrowmarks a1, a2, a3. When exceeding a predetermined temperature, a valve seat 13 is opened, and otherwise, the valve seat 13 is shut off. Even when a ball valve 14 is pushed out of the valve seat 13 with the forcible operation of extension during shut-off, stress on a bimetal disc 15 is absorbed by a spiral spring 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control valve used for a piston / cylinder unit or the like.

  2. Description of the Related Art Conventionally, for example, a piston / cylinder unit having a gas spring structure is known as a device that is disposed in an opening / closing portion of a rear flap (also referred to as a tailgate) of an automobile to buffer a sudden opening / closing operation of the rear flap. .

As an example, for example, in a gas spring configuration in which a cylinder is filled with compressed gas, a bimetal disk is used as a temperature-dependent elastic body, and changes in the holding force of the gas spring due to changes in ambient temperature are absorbed. There has been proposed a structure in which the holding force of the spring is maintained within a certain range. (For example, refer to Patent Document 1.)
In this technology, the piston rod is configured as a hollow cylindrical body rather than a solid rod, and the internal cavity of the piston rod of this cylindrical body is used as a gas chamber for temperature compensation. It opens and closes the gas passage of the temperature compensation gas chamber.

In addition, in order to switch depending on the temperature, a plate-shaped bimetal formed into a U shape has been proposed. (For example, see Patent Document 2.)
In this technique, when the piston portion incorporating the bimetal moves upward in the cylinder, the flow path when the gas in the upper chamber moves to the lower chamber is stopped by the packing on the outer peripheral side. Concentrate on the control valve. When the ambient temperature is high and the gas temperature is high, both gas pressures are high and the holding force of the piston rod is sufficiently maintained.

However, although the cylinder volume does not change as the ambient temperature decreases, the gas pressure decreases due to the temperature dependence of the gas volume, and the force required to operate the cylinder changes. In order to cope with this, the pressing force in the direction of closing the control valve is changed by the displacement of the bimetal plate due to the temperature, thereby keeping the force necessary for the operation of the cylinder constant.
Japanese Unexamined Patent Publication No. 09-126262 ([Summary], FIG. 1, FIG. 2, FIG. 3) JP 11-270612 A ([Summary], FIG. 3)

  However, although it can be said that the technology of Patent Document 1 is relatively easy to control corresponding to the ambient temperature, the piston rod is enlarged because the inside of the piston rod is hollow and used as a temperature compensating gas chamber. . That is, there is a problem that the entire piston / cylinder unit is enlarged. In addition, the structure in the vicinity of the valve is also complicated, and there is a problem that high technology and labor are required for the assembly.

  In the technique of Patent Document 2, the structure of the bimetal plate is simple. However, since the bimetal plate is continuously displaced by temperature change, it is necessary to check the posture and position at the set temperature in the management of the set temperature. Yes, and management of setting accuracy is not easy. Furthermore, since the setting characteristics change when an external stress more than necessary acts on the bimetal itself, there is a possibility that the characteristics change due to an abnormally high temperature and an aggressive operation.

  An object of the present invention is to provide a control valve that stabilizes the characteristics of a cylinder / piston unit so that the holding force of a gas spring that strongly depends on temperature or the gentle operation during operation does not depend on temperature.

  The control valve of the present invention is a control valve for a cylinder / piston unit that is provided in the piston in a sealed space that is divided into at least two parts by a cylinder and a piston and filled with compressed gas, respectively, and that depends on the direction of movement of the piston. A switching temperature is set, and depending on the switching temperature of the ambient temperature, a thermally actuated body that switches the operation of pressing or releasing the valve against the valve seat, and attaching the thermally actuated body in the direction of pressing the valve. And an urging member for urging.

  The control valve is, for example, a ball valve, the thermal responder is a ring-type bimetal that reverses the direction of warping at the set switching temperature, and the biasing member is an inner diameter side of the ring-type bimetal. The ring-type bimetal can be configured to operate with its outer diameter side as the free end of the reversal operation.

  Further, for example, the control valve is a ball valve, the thermal responder is a ring-type bimetal that reverses the warping direction at the set switching temperature, and the biasing member is the ring-type bimetal. It is a disc spring arranged so as to press the inner diameter side, and the ring-type bimetal may be configured to operate with the outer diameter side as a free end of the reversing operation.

  Further, for example, the control valve is a leaf valve, the thermal responder is a ring-type bimetal that reverses the direction of warping at the set switching temperature, and the biasing member is the ring-type bimetal. It is a coil spring arranged so as to press the inner diameter side, and the ring-type bimetal may be configured to operate with the outer diameter side as a free end of the reversing operation.

  The control valve may be, for example, a ball valve, and the thermally responsive body may include a ring-shaped outer edge portion and an inner disk portion integrally connected to the ring-shaped outer edge portion. A creep-type plate bimetal, wherein the biasing member is a coil spring arranged to press the ring-shaped outer edge portion of the plate bimetal, and the plate bimetal is the ring-shaped outer edge of the inner circular plate portion. You may comprise so that it may operate | move as a free end of a reversal | inversion operation | movement of the circumference part on the opposite side of the circumference part integrally connected with the part.

  According to the present invention, a bimetal and a compression spring are used in combination as a control valve for solving the temperature dependence of the gas in the cylinder. As a result, it is possible to limit the stress acting on the bimetal by absorbing the stress due to the pressure applied to the valve by the compression spring, and therefore it is possible to provide a stable control valve without any change in the characteristics of the bimetal. Become.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1 (a) and 1 (b) are diagrams showing the configuration and operating state of the control valve of the cylinder / piston unit in the first embodiment, and FIG. 1 (c) shows a ring used for this control valve. It is a figure which shows the shape of a type | mold bimetal.

Since FIG. 1 (b) has the same configuration as FIG. 1 (a), only the components necessary for explanation of the operation are given the same numbers as in FIG. 1 (a).
As shown in FIGS. 1 (a) and 1 (b), the cylinder / piston unit 1 includes a cylinder 2, a piston portion 3, and a piston rod 4. The piston rod 3 has a piston portion 3 fixed to an end portion that is drawn into the cylinder 2.

  The interior of the cylinder 2 is divided by the piston portion 3 into at least two working chambers, a drawing gas chamber 5 and a pushing gas chamber 6. These two working chambers are filled with a predetermined compressed gas.

Further, the piston rod 4 is in frictional contact with the packing 7 at the insertion portion to the cylinder 2, whereby the extraction gas chamber 5 is hermetically closed from the outside.
A piston ring groove 8 is formed around the piston portion 3. A piston ring 9 is fitted in the piston ring groove 8. The piston ring 9 is movable in the axial direction in the piston ring groove 8 and is in frictional contact with the inner wall of the cylinder 2.

A gas flow path 11 is formed in the piston portion 3 along the axial direction in a part of the week surface located between the piston ring groove 8 and the pushed-in gas chamber 6.
Furthermore, the piston portion 3 is formed with a gas flow path 12 formed of an annular cavity that is closed on the side of the pushing-in gas chamber 6 and opened to the entire surface of the extraction gas chamber 5. The gas flow path 12 is in part in communication with the piston ring groove 8 and the valve seat 13.

  A ball valve 14 is detachably attached to the valve seat 13. On the opposite side of the valve seat 13 with respect to the ball valve 14, a ring-type bimetal disc 15 is arranged with its outer diameter side corresponding.

  As shown in FIG. 1 (c), the bimetal disk 15 is a donut shape with a hole 16 in the center, has an outer diameter and an inner diameter of a substantially perfect circle, and performs a snap operation that reverses the warping direction at a set temperature. It is a disk.

  As shown in FIG. 1 (a), between the piston part 3 and the crushing caulking part 4-1 at the extreme end part of the piston rod 4 that is pushed into the gas chamber 6 by pushing from the piston part 3, A cylindrical positioning / holding member 17 having an overhanging flange formed vertically is fitted.

  The bimetal disc 15 is fitted through the hole 16 in contact with the flange on the piston portion 3 side of the positioning holding member 17. Further, a helical spring 18 is externally fitted to the positioning holding member 17, and is interposed between the flange on the pushing gas chamber 6 side of the positioning holding member 17 and the bimetal disk 15.

  Thereby, the inner diameter side of the bimetal disc 15, that is, the peripheral portion of the hole 16 is always pressed against the flange on the piston portion 3 side of the positioning holding member 17 by the helical spring 18, that is, toward the piston portion 3 side.

  1 (a) and 1 (b), it is disposed between the crushing caulking portion 4-1 of the piston rod 4 and the bottom surface at the left end portion outside the figure of the pushing gas chamber 6 of the cylinder 2. The spiral push spring is not shown.

  In this example, the operating temperature at which the bimetal disk 15 reverses the warping direction is set to 0 ° C., for example. FIG. 1 (a) shows a state where the set temperature exceeds 0 ° C., which is the set temperature. That is, in the piston part 3, the control valve which consists of the bimetal disc 15, the ball valve 14, and the valve seat 13 is an open state.

  In this state, when the piston rod 4 is pulled out from the cylinder 2 as shown by an arrow a, the piston ring 9 is relatively pushed into the piston ring groove 8 as shown by a solid line in the figure. Move to the side. Therefore, the gas flow path 11 between the piston ring groove 8 and the pushing gas chamber 6 is closed.

  However, since the control valve is open, the gas in the extraction gas chamber 5 which is adiabatically compressed by the extraction of the piston rod 4 and the pressure is increased flows into the annular gas flow path 12 as indicated by the arrow a1, It flows into the flow path 19 of the valve seat 13 as shown by the arrow a2, and passes through the gap of the opened control valve and flows into the pushing gas chamber 6 as shown by the arrow a3.

  In this state configuration, when the ambient temperature is sufficiently high, the gas pressure inside the cylinder 2 is kept sufficiently high, and the cylinder / piston unit 1 is held even when the control valve is open, or the piston rod 4 is loose. The drawer state can be maintained.

  On the other hand, when the cylinder / piston unit 1 is forcibly operated in this state, that is, when the piston rod 4 is forcibly moved in the pulling direction, the ball valve 14 pushed by the gas pressure pushes out the bimetal disc 15. However, since the external stress is absorbed by the contraction of the spiral spring 18 in the direction in which the bimetal disk 15 is pushed out, it is possible to avoid the influence that causes the characteristic change.

  When the piston rod 4 is pushed into the cylinder 2 as indicated by an arrow b, the ball valve 14 moves relatively toward the valve seat 13 due to inertia and closes the flow path of the valve seat 13. However, at the same time, the piston ring 9 moves relatively toward the extraction gas chamber 5 in the piston ring groove 8 as indicated by a broken line in the figure. Therefore, the gas flow path 11 between the piston ring groove 8 and the pushing gas chamber 6 is opened.

  The gas in the pushed gas chamber 6 that has been adiabatically compressed by the pushing of the piston rod 4 and increased in pressure flows into the gas flow path 11 as indicated by the arrow b1 and passes through the piston ring groove 8 as indicated by the arrow b2. The gas flows into the annular gas flow path 12, and further flows into the extraction gas chamber 5 as indicated by an arrow b3. This gradually eliminates the gas pressure imbalance between the two working chambers.

  FIG.1 (b) has shown the state below 0 degreeC which is preset temperature. That is, in the piston portion 3, the control valve including the bimetal disk 15, the ball valve 14, and the valve seat 13 is in a closed state.

  In this state, when the piston rod 4 is pulled out from the cylinder 2 as shown by an arrow a, the piston ring 9 is also relatively pushed into the piston ring groove 8 as shown by a solid line in the figure. Move to container 6 side. Therefore, the gas flow path 11 between the piston ring groove 8 and the pushing gas chamber 6 is closed.

  In this case, since the control valve is also closed, the gas in the extraction gas chamber 5 is adiabatically compressed by the extraction of the piston rod 4. The gas pressure in the extraction gas chamber 5 is not so high because the ambient temperature is low. Therefore, the gas pressure is moderated by adiabatic compression, and the cylinder / piston unit 1 can be held or the piston rod 4 can be kept in a moderately drawn state.

  However, when the gas pressure in the extraction gas chamber 5 exceeds a predetermined limit, the gas that has become a high pressure in the extraction gas chamber 5 flows according to the flow paths indicated by arrows a1, a2, and a3 in FIG. Is pushed up from the valve seat 13 and flows into the pushed-in gas chamber 6.

  Further, when the piston rod 4 is pushed into the cylinder 2 as indicated by the arrow b, the state is the same as described with reference to FIG. However, as described above, the pushing gas chamber 6 is provided between the crushing caulking portion 4-1 of the piston rod 4 and the bottom surface of the pushing gas chamber 6 of the cylinder 2 at the left end portion outside the figure. Since a spiral push spring (not shown) is provided, a sudden operation is avoided regardless of the ambient temperature, that is, regardless of the gas pressure in the two working chambers.

  Generally, snap-type bimetal discs can easily change the set temperature, and the reversing operation at the set temperature is accurate. Therefore, if the snap-type bimetal disc is used as a control valve, the set temperature can be easily managed. .

  Further, in this example, since the snap-type bimetal disk and the compression spring are combined, the operation as the control valve becomes clear, and it is possible to prevent a change in the bimetal characteristics due to an excessive operation.

  FIGS. 2A and 2B are views showing the configuration and operating state of the control valve of the cylinder / piston unit in the second embodiment. In FIGS. 2 (a) and 2 (b), parts different in configuration from FIG. 1 (a) are given new numbers, and parts having the same configuration as FIG. The same numbers as those in FIG. 1 (a) are given, and the other parts are not given numbers.

  As shown in FIGS. 2A and 2B, in this example, two disc springs 21 are externally fitted to the positioning holding member 17 in place of the spiral spring 18 so that the pushing gas capacity of the positioning holding member 17 is increased. It is interposed between the flange on the chamber 6 side and the bimetal disc 15.

The operation and action of the control valve composed of the two disc springs 21, the bimetal disc 15, the ball valve 14, and the valve seat 14 are the same as those in FIGS. 1 (a) and 1 (b).
In this example, an example in which two disc springs are combined with a bimetal disc instead of a spiral spring is shown, but the disc spring is not limited to two, for example, one may be used, or three or more are used. You may do it.

  3 (a) and 3 (b) are diagrams showing the configuration and operating state of the control valve of the cylinder / piston unit in the third embodiment, and FIG. 3 (c) shows the leaf used in this control valve. It is a figure which shows the shape of a valve.

  In FIGS. 3 (a) and 3 (b), parts different in configuration from FIG. 1 (a) are given new numbers, and parts having the same configuration as FIG. The same numbers as those in FIG. 1 (a) are given, and the other parts are not given numbers.

  As shown in FIGS. 3A and 3B, in this example, one leaf valve 22 shown in FIG. 3C is used instead of the ball valve 14 shown in FIG. As shown in FIG. 3C, the leaf valve 22 is a leaf spring having a donut shape having a hole 23 in the center and a substantially perfect circle with an outer diameter and an inner diameter.

In this example, the accommodating portion of the ball valve 14 in FIG. 1 (a) forms a valve seat 24 as shown in FIG. 3 (a). Also in this case, the valve body is controlled by the bimetal disc 15.
FIG. 3A shows a state in which the temperature exceeds a predetermined temperature, and the bimetal disk 15 opens the leaf body of the leaf valve 22. The leaf valve 22 itself is in a position to close the valve body, but is not in a state of controlling the gas movement in the extending operation of the cylinder / piston unit 1, that is, the pulling-out operation of the piston rod 4.

  That is, the gas in the extraction gas chamber 5 compressed by the extraction of the piston rod 4 pushes the valve body of the leaf valve 22 and pushes it out to the gas chamber 6 side. The gas flows into the gas chamber 6 side through the gap formed between the two.

  At this time, even if excessive gas movement occurs and the gas pressure of the gas flow pushes the outer peripheral portion of the leaf valve 22 and pushes it largely toward the gas chamber 6, the bimetal disk 15 and the compression spring ( Here, a spiral spring 18 is shown) can absorb the stress and protect the leaf valve 22.

FIG. 3B shows a state in which the control valve operates as a predetermined temperature or lower. The bimetal disk 15 and the compression spring (spiral spring 18) press the leaf valve 22 from behind.
In this case as well, even when a high gas pressure is applied from the extraction gas chamber 5 during the forced operation, the compression spring absorbs the stress and protects the bimetal disk 15 and the leaf valve 22.

  As described above, in each of the first to third embodiments, the snap-type bimetal disk 15 is used as the thermally actuated body. However, the present invention is not limited to this, and the combination with the compression spring is displaced according to the temperature change. It may be combined with a creep-type bimetal disc as a thermal actuator. This will be described below as a fourth embodiment.

  FIGS. 4 (a) and 4 (b) are diagrams showing the configuration and operating state of the control valve of the cylinder / piston unit in the fourth embodiment. FIG. 4 (c) shows the creep used for this control valve. It is a figure which shows the shape of a type | mold bimetal.

  In FIGS. 4 (a) and 4 (b), parts having the same configuration as those in FIG. 1 (a) are given new numbers, and the configuration is almost the same as that in FIG. Are assigned the same numbers as in FIG. 1 (a), and the other parts are omitted.

  As shown in FIGS. 4 (a) and 4 (b), in this example, a ball valve 14 is used as a valve of the gas flow section when the cylinder / piston unit is extended, and a compression spring and a thermal response as a valve presser are used. The body uses a large-diameter spiral spring 25 and a creep-type bimetal disk 26 instead of the spiral spring 18 and the bimetal disk 15 shown in FIG.

  As shown in FIG. 4 (c), the creep-type bimetal disk 26 includes a ring-shaped outer edge portion 27 and an inner disk portion having a connecting portion 28 that is integral with the ring-shaped outer edge portion 27 at a part of the circumferential portion. 29 is a plate bimetal.

  The inner disk portion 29 has a substantially donut shape with a large-diameter hole 31 in the center. Two small-diameter holes 32 provided on the circumference including the connecting portion 28 between the inner disk portion 29 and the ring-shaped outer edge portion 27 separate the ring-shaped outer edge portion 27 and the inner disk portion 29 from each other. It is a hole cut out in order to balance the whole with the gap 33 of the part.

The large-diameter spiral spring 25 is arranged so as to press the ring-shaped outer edge portion 27 of the creep type bimetal disk 26.
The creeping bimetal disc 26 in which the ring-shaped outer edge 27 is pressed by the large-diameter spiral spring 25 and the ring-shaped outer edge 27 is fixed to the piston seat in this manner is formed on the ring-shaped outer edge 27 of the inner disk portion 29. The circumferential portion 34 opposite to the integrally connected circumferential portion (connecting portion 28) operates as a free end of the reversing operation.

  FIG. 4A shows a state where the temperature exceeds a predetermined temperature, and the free end of the reverse operation of the creep type bimetal disk 26 (the circumferential portion 34 on the opposite side of the connecting portion 28) opens the ball valve 14. Therefore, the ball valve 14 is not in a state of controlling the gas movement in the extending operation of the cylinder / piston unit 1, that is, the pulling-out operation of the piston rod 4.

  FIG. 4 (b) shows a state in which it operates as a control valve below a predetermined temperature. A creep-type bimetal disk 26 whose ring-shaped outer edge portion 27 is fixed by a large-diameter helical spring 25 is rotated by a reversing operation of a free end (a circumferential portion 34 opposite to the connecting portion 28), and the ball valve 14 is moved from behind to the valve seat 13. Is pressed.

  As described above, even when the creep type bimetal disk and the compression spring are combined, if the excessive operation occurs, the compression spring behind the creep type bimetal disk absorbs the stress applied to the creep type bimetal disk by the excessive operation. Thus, it is possible to protect the creep type bimetal disk from excessive operation and to prevent the characteristic change of the creep type bimetal disk.

  In addition, the creep type bimetal disc does not necessarily have the accuracy of the set temperature. However, if the gas pressure gradually changes due to the change of the ambient temperature like a gas spring, the operability is changed. It is an effective member as a thermal actuator combined with a compression spring.

  In the first to fourth embodiments described above, maintaining the holding force when the cylinder / piston unit composed of the gas spring is extended, temperature compensation for the gradual operation, and valve for the gas flow path during the forced extension operation We've talked about holding-bimetal protection.

  In the fifth embodiment, contrary to the above, maintenance of the holding force when the cylinder / piston unit is contracted, temperature compensation for gradual operation, and protection of the valve presser bimetal of the gas flow path during forced contraction operation. The configuration will be described.

FIGS. 5 (a) and 5 (b) are diagrams showing the configuration and operating state of the control valve of the cylinder / piston unit in the fifth embodiment corresponding to the reverse operation.
As shown in FIG. 5 (a), in this example, the piston 3 is attached to the piston rod 4 in the direction opposite to that in FIG. 1, and accordingly, the bimetal disk 15 held by the positioning holding member 17 and The spiral spring 18 is also attached in the opposite direction to that of FIG.

  FIG. 5 (a) shows a state in which a predetermined temperature is exceeded, and the control valve including the valve seat 13, the ball valve 14, the bimetal disk 15 and the spiral spring 18 is in an open state. FIG. 5 (b) shows a state in which the control valve is closed because the temperature is lower than the predetermined temperature. Even when a load is applied to the valve body (ball valve 14) by the forcible operation in this state, the spiral spring 18 behind can absorb the stress before the bimetal disk 15 is structurally affected.

  As described above, in the operation of the piston of the gas spring, in the case of holding or controlling the gentle pushing operation by reverse pushing, it is possible to cope with the reverse structure shown in FIGS.

(a), (b) is a figure which shows the structure and operation state of the control valve of the cylinder / piston unit in 1st Embodiment, (c) is a figure which shows the shape of the ring type bimetal used for this control valve. is there. (a), (b) is a figure which shows the structure and operating state of the control valve of the cylinder and piston unit in 2nd Embodiment. (a), (b) is a figure which shows the structure and operation state of the control valve of the cylinder / piston unit in 3rd Embodiment, (c) is a figure which shows the shape of the leaf valve used for this control valve . (a), (b) is a figure which shows the structure and operation state of the control valve of the cylinder / piston unit in 4th Embodiment, (c) is a figure which shows the shape of the creep type bimetal used for this control valve. is there. (a), (b) is a figure which shows the structure and operating state of the control valve of the cylinder and piston unit in 5th Embodiment corresponding to reverse operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder / Piston unit 2 Cylinder 3 Piston part 4 Piston rod 4-1 Crushing caulking part 5 Draw-out gas capacity chamber 6 Push-in gas capacity chamber 7 Packing 8 Piston ring groove 9 Piston ring 11 Gas flow path 12 Gas flow path 13 Valve seat 14 Ball valve 15 Bimetal disc 16 Hole 17 Positioning holding member 18 Helical spring 19 Valve seat flow path 21 Belleville spring 22 Leaf valve 23 Hole 24 Valve seat 25 Large-diameter spiral spring 26 Creep type bimetal 27 Ring-shaped outer edge 28 Connecting portion 29 Inner circle Plate part 31 Large-diameter hole 32 Small-diameter hole 33 Gap 34 Circumferential part opposite to connecting part

Claims (5)

A cylinder / piston unit control valve that is provided in the piston in a sealed space that is divided into at least two parts by a cylinder and a piston and filled with compressed gas, respectively, and that depends on the direction of movement of the piston;
A thermally actuated body that is set with a switching temperature and switches the operation of pressing or releasing the valve against the valve seat depending on the switching temperature of the ambient temperature;
An urging member that urges the thermally responsive body in a direction of pressing the valve;
A control valve characterized by comprising: The valve is a ball valve;
The thermoresponsive body is a ring-type bimetal that reverses the direction of warping at the set switching temperature,
The biasing member is a coil spring arranged to press the inner diameter side of the ring-type bimetal,
The control valve according to claim 1, wherein the ring-type bimetal operates with its outer diameter side as a free end of the reversal operation. The valve is a ball valve;
The thermoresponsive body is a ring-type bimetal that reverses the direction of warping at the set switching temperature,
The biasing member is a disc spring arranged to press the inner diameter side of the ring-type bimetal,
2. The control valve according to claim 1, wherein the ring-type bimetal operates with its outer diameter side as a free end of the reversing operation. The valve is a leaf valve;
The thermoresponsive body is a ring-type bimetal that reverses the direction of warping at the set switching temperature,
The biasing member is a coil spring arranged to press the inner diameter side of the ring-type bimetal,
2. The control valve according to claim 1, wherein the ring-type bimetal operates with its outer diameter side as a free end of the reversing operation. The valve is a ball valve;
The thermally responsive body is a creep-type plate bimetal composed of a ring-shaped outer edge portion and an inner disk portion having a connecting portion integrated with the ring-shaped outer edge portion at a part of the circumferential portion,
The biasing member is a coil spring disposed so as to press the ring-shaped outer edge of the plate bimetal.
2. The control according to claim 1, wherein the plate bimetal operates using a circumferential portion opposite to a circumferential portion integrally connected to the ring-shaped outer edge portion of the inner disc portion as a free end of the reversing operation. valve.