JPH0332841Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention uses a wax thermoelement that operates so that the plunger is linearly pushed out when the temperature rises, and drives the rotation mechanism in response to temperature changes. This invention relates to improvements made to thermomotors.

[Prior Art] When controlling equipment in response to temperature changes, it is often necessary to drive a rotary operating section. Means for meeting such demands are usually implemented by combining a number of mechanisms such as an electric motor, a thermostat, and a rotating mechanism.

The thermomotor was developed in order to be able to drive a rotating mechanism in response to temperature changes without using an electric motor and with a simplified mechanism, instead of using a complicated mechanism and an electric motor to drive a rotating mechanism in response to temperature changes. A thermostat whose output shaft rotates in response to temperature changes by combining a thermostat with a mechanism that converts the movement of the drive unit in response to temperature changes into rotational movement. It is. This thermomotor uses a wax thermoelement in its thermostat, which can make the operation due to temperature changes extremely strong, and the operation is a linear movement that pushes out the plunger. It is composed of a combination of mechanisms that convert it into rotational motion, but the previous one, as described in Japanese Utility Model Application Publication No. 16387-1987, was created by increasing the temperature of wax sealed in a case-shaped body. In a wax thermoelement in which the plunger is pushed out by the pressure of thermal expansion, the plunger is provided with a spiral groove on its outer circumferential surface, and the guide tube that guides the plunger in and out has a tip in the spiral groove. By providing a pin that fits on both sides, when the plunger is pushed out by the pressure of the wax inside the body, rotational action is given to the plunger by the engagement of this spiral groove and the pin. The rotational movement of the plunger itself is utilized for the driving part of the rotation mechanism.

[Problem that the invention attempts to solve] The wax thermoelement plunger is
It is used to convert the pressure of wax sealed in the body into linear motion, and the length of expansion and contraction, which is the amount of movement in and out, depends on the thickness (diameter) of the plunger. There is a restriction that it is not possible to increase the diameter because it can only be obtained for a short time. For this reason, if a spiral groove is to be provided on the outer circumferential surface of the plunger in order to convert the linear motion of the plunger into rotational motion, the diameter must be increased by at least twice the depth of the spiral groove. Correspondingly, in order to obtain the necessary stretchable length, it is necessary to increase the amount of wax sealed in the body, making it difficult to miniaturize the body.

Further, since the plunger is pushed out by the pressure caused by the thermal expansion of the wax, it is held in close contact with the sealing member to prevent the wax from leaking out. Therefore, when the linear motion of the plunger is combined with the rotational motion in order to convert the linear motion of the plunger into rotational motion, the resistance in the rotational direction generated on the surface of the plunger that is in close contact with the sealing member is further added. Therefore, there is a problem that the loss of force increases and the sealing function of the sealing member is impaired.

The present invention was devised to solve these problems that occur in conventional means, and the plunger is made small in diameter to allow for a large amount of expansion and contraction while converting the linear motion of the plunger into rotational motion. This action of converting the linear motion of the plunger into rotational motion eliminates loss of force due to frictional resistance between the plunger and the seal member, and improves the sealing function of the seal member. The purpose is to provide a new means to enable this to be carried out without any damage.

[Means for Solving the Problems] In the present invention, as a means for achieving this object, a wax thermoelement that operates so that the plunger is pushed out by temperature rise is provided, and the plunger of the wax thermoelement is moved in the axial direction. It is assembled to the machine frame so that it can move in a straight line and move in and out freely, and the tip of the plunger is placed over the outer periphery of the guide cylinder of the wax thermoelement like a cap, and is displaced in the axial direction of the guide cylinder by rotation. Abut against the inside of the ceiling of the rotating body that is screwed together so that
A spring receiver is disposed at a position facing the rotating body at a predetermined distance and is rotatably supported on the machine frame by a rotating shaft aligned with the axis of the rotating body, and the spring receiver and the rotating body A return spring made of a torsion coil spring that transmits the torsional moment is provided between the
The present invention proposes a thermomotor in which the rotating body and a spring receiver are linked in the rotational direction by the return spring, and the rotating shaft of the spring receiver is used as the rotational power extraction shaft.

[Example] Next, embodiments will be described in detail with reference to the drawings.

Fig. 1 is a vertically sectional front view of a thermomotor A in which the present invention can be implemented. The rotating shaft to be taken out, c, indicates a load conductively connected to the rotating shaft S.

The wax thermoelement a has a case-shaped body 10 filled with wax 11,
A diaphragm 14 is placed over the opening of the body 10 to enclose the wax 11 within the body 10,
The proximal end 12a of the guide cylinder 12 is joined from above the diaphragm 14 and connected to the opening of the body 10, and the inner cavity of the proximal end 12a of the guide cylinder 12 is filled with fluid 15 with good fluidity. and guide cylinder part 1
A rubber piston 16 and a Teflon plate 17 are slidably inserted into the body part 12b of 2, and on the outside thereof,
Next, a plunger 13 is fitted into the body part 12b of the guide cylinder part 12 so as to be able to move in and out in a straight line along the axial direction. By fitting the provided diameter-expanding fitting portion into the assembly portion 40 provided on the machine frame b in a watertight manner and fixing it with the set screw 41,
The plunger 13 is assembled to the machine frame b so that it can freely move in and out. A male thread w is carved on the outer circumferential surface of the body 12b of the guide tube 12, and a rotating body 2 formed in a cylindrical shape on the outer circumference of the body 12b of the guide tube 12 is attached to the male screw w. but,
They are rotatably fitted and screwed together by meshing the female thread y provided on the inner peripheral surface with the male thread w provided on the outer peripheral surface of the body 12b of the guide cylinder section 12. The male thread w provided on the outer circumferential surface of the body portion 12b of the guide tube portion 12 is formed into a cylindrical shape separate from the guide tube portion 12, as shown in FIG. It may be installed by integrally fitting through a keyway.

The machine frame b consists of a lower machine frame 4 that includes the assembly section 40 and an upper machine frame 5 that is detachably assembled to the lower machine frame 4. A guide path 42 is integrally formed to guide fluid to come into contact with the outer periphery of the body 10, which becomes the temperature sensing portion of the attached wax thermoelement a. Also,
The upper machine frame 5 has a body part 1 of the guide cylinder part 12 of the wax thermoelement a assembled to the lower machine frame 4.
2b and the rotating body 2 screwed onto its outer periphery are formed into a cylinder shape with a bottom that covers the rotary body 2b, and is connected to the upper opening of the lower machine frame 4 with the open side facing down,
They are integrally connected.

In the upper part of the inner cavity of the upper machine frame 5, there is a disk-shaped spring receiver 6 formed to have approximately the same diameter as the cylindrical rotating body 2 described above, and a rotating shaft S integrally provided on the upper surface side of the disk-shaped spring receiver 6. is rotatably supported by a bearing 50 provided on the upper wall of the upper machine frame 5, so that it is disposed above the rotating body 2 so that its axis of rotation is aligned with that of the rotating body 2. , and the distal end side of the rotating shaft S thereof passes through the aforementioned bearing 50 and protrudes to the outside, and the protruding portion serves as an extraction shaft from which rotational power is extracted.

7 is a return spring that pushes the rotor 2 and plunger 3 in the opposite direction to the extrusion direction by the pressure of the wax 11 when the pressure of the wax decreases and returns to the previous position, and is formed as a torsion coil spring. It is provided between the spring receiver 6 and the rotating body 2 to connect them in the rotational direction, and both ends thereof are connected to the spring receiver 6 and the rotating body 2 by connecting pins 70, 70. They are linked together so that they rotate together.
When the return spring 7 made of this torsion coil spring is bent due to a torsional moment received at one end, it has a strong spring property to restore the torsional moment to the other end, but it does not move in the axial direction. The spring pressure in the direction of compression is extremely weak.

The load c connected to the rotating shaft S is a butterfly valve, a part of which is shown in the drawing, and the lower end side of its rotating shaft 80 is fitted into the protruding end of the rotating shaft S. Therefore, it is configured to rotate together with the rotation axis S. Then, the other end of the return spring 82, one end of which is connected to the machine frame on the equipment side, is connected to the arm 81 protruding from the lower end of the rotating shaft 80, and the extrusion pressure of the plunger 13 of the wax thermoelement a disappears. When this occurs, the return spring 82 allows the return rotation.

[Operation] The thermomotor according to the present invention configured as described above operates as follows.

The temperature of the fluid in contact with the outer surface of the body 10, which is the temperature sensing part of the wax thermoelement a, is lower than the set temperature.
When the pressure of
→The rotating body 2 is rotated by the rotational moment transmitted in this order to the torsion coil spring 7, and the rotating body 2 is lowered to a position where the inner surface of the ceiling wall abuts the tip of the plunger 13 (FIG. 2).

Next, body 10 of wax thermoelement a
When the temperature of the fluid in contact with the outer surface of the plunger 13 rises to exceed the set temperature and the plunger 13 is pushed out by moving in a straight line along the axial direction due to the pressure of the wax 11, the rotating body 2 is pushed by its operation. It rotates while being raised, thereby applying a torsional moment to the lower end side of the return spring 7 made of a torsion coil spring, and using that moment to rotate the spring receiver 6,
The rotating shaft S is rotated, and the load c is rotated.

Next, during the operation in which the plunger 13 is being pushed out due to this temperature rise, if the rotating shaft S becomes locked due to trouble on the load side, the rotating body 2 is pushed out by the pushing operation of the plunger 13.
The rotational operation causes the return spring 7, which is a torsion coil spring, to twist and flex, and the extrusion pressure of the wax thermoelement a is released by the deflection of the return spring 7, which is a torsion coil spring.

Further, by selecting the return spring 7 made of a torsion coil spring, the rotating body 2 can receive a strong torsional moment but hardly receive an axial pressure, thereby converting the linear motion of the plunger 13 into a rotational motion. This prevents stress from being applied to the threaded portions (male thread w and female thread y).

[Effect of the invention] As explained above, in the thermomotor according to the invention, the plunger 13 of the wax thermoelement a is moved in a straight line along the axial direction to perform the in/out operation. in,
By converting linear motion into rotational motion by moving the rotating body 2 screwed onto the outer periphery of the guide tube 12, the plunger 13 can be made smaller in diameter, making it easier to downsize the plunger 13. To reduce loss of force and prevent deterioration of sealing function of a sealing member by reducing frictional resistance to only resistance to linear motion. Moreover, since the rotational motion converted from the linear motion of the plunger 13 is transmitted to the rotational power extraction shaft via the return spring 7 formed as a torsion coil spring, a large load is placed on the rotational power extraction shaft. The return spring 7 now releases the pressure that would have pushed out the plunger 13 when the take-out shaft was previously locked, effectively preventing damage to the threaded portion that converts linear motion into rotational motion. Become.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a thermomotor according to the present invention, and FIG. 2 is a longitudinal sectional front view of main parts of another embodiment. Explanation of drawing symbols, A...thermo motor, a...
...Wax thermoelement, b...Machine frame, c...
...Load, S...Rotating shaft, w...Male thread, y...Female thread, 10...Body, 11...Waxes, 1
2... Guide cylinder part, 12a... Base end part, 12b...
... Body, 13 ... Plunger, 14 ... Diaphragm, 15 ... Fluid, 16 ... Rubber piston, 17 ... Teflon plate, 2 ... Rotating body, 3 ...
Spring, 4... Lower machine frame, 40... Assembly part, 41...
... Set screw, 42 ... Taxiway, 5 ... Upper machine frame,
50... Bearing, 6... Spring receiver, 7... Return spring, 70... Linking pin, 8... Rotating shaft, 81...
Arm, 82...Return spring.

Claims (1)

[Scope of utility model registration request] A wax thermoelement a, which operates so that the plunger 13 is pushed out by rising temperature, is assembled to the machine frame b so that the plunger 13 moves linearly in the axial direction and can freely move in and out. is placed on the outer periphery of the guide cylinder part 12 of the wax thermoelement a in a cap shape, and is screwed together so that it is displaced in the axial direction of the guide cylinder part 12 by rotation. , a spring receiver 6 is arranged at a position facing the rotating body 2 at a predetermined distance, and the rotating body 2 is
The machine frame b can be rotated freely by the rotation axis S that is aligned with the axis center line of
A return spring 7 made of a torsion coil spring that transmits a torsion moment is provided between the spring receiver 6 and the rotating body 2, and the return spring 7 rotates the rotating body 2 and the spring receiver 6. A thermomotor that is connected in the same direction as the rotary shaft S of the spring receiver 6 as a shaft for extracting rotational power.