JPH0136268Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a thermostat used for temperature control of refrigerators, air conditioners, etc.

[Technical background of the invention] The structure of a thermostat used to control the temperature of conventional refrigerators, air conditioners, etc. is as follows.
As shown in FIGS. 1 and 2, a power element 2 for sensing the temperature of the temperature sensing part is provided at the left end of the main body 1 in the figure, and a cam arm is connected to the cam arm via a hinge pin 3 supported by the main body 1 near the power element 2. 4 and a rotating base of a bellows lever 6 as a contact operating lever are rotatably supported, and a bellows lever insulator 5 is fixed to this bellows lever 6 by caulking.
A range screw 7 is engaged with the right end of the cam arm 4, and a range spring 8 (tension spring) is stretched between the range screw 7 and the cam arm 4. energize counterclockwise around hinge pin 3,
The left end of the bellows lever 6 (as shown in the figure) is pressed against the bellows extension point 9 of the power element 2, and the cam arm 4 is biased to the right about the hinge pin 3, and the dial shaft 10 for adjusting the set temperature is mounted on the top surface of the main body 1 (as shown in the figure). This cam arm 4 is attached to the outer peripheral surface of the cam 11 which is integrated by caulking and rotates together with the dial shaft 10.
Press the top edge of the

Furthermore, a mounting plate 14 is fixed to the lower part of the main body 1,
A plate-shaped switch spring 15 is attached to this mounting plate 14.
The proximal end of the contact plate 16 is fixed, and a contact piece 17 is provided on the top surface of the distal end of the switch spring 15 to contact the bottom surface of the bellows lever insulator 5, and an actuating piece 18 is provided on the bottom surface of the switch spring 15. An inner toggle 19 and an inner toggle spring 20 engaged therewith are fitted into the elongated holes of the contact plate 16, and the actuating piece 18 is engaged with the inner toggle 19, and the lower side of the inner toggle 19 A screw 21 serving as a rotational fulcrum for the inner toggle 19 is disposed at the inner toggle 19, a movable contact 22 is provided at the tip of the contact plate 16, and a fixed contact 23 is disposed above the contact 22 to face it.

To explain the operating principle of this conventional thermostat, there is a power element 2 that senses the temperature of the temperature sensing part.
consists of a capillary copper tube 26, a diaphragm fitting 27, a diaphragm plate 28, a diaphragm 29, and the bellows extension point 9, and gas is sealed inside. As the temperature of the temperature sensing part rises and falls, the sealed gas expands and contracts, the diaphragm 29 expands and contracts, and the bellows extension point 9 moves. For example, when the temperature of the temperature sensor increases, the sealed gas expands, causing the diaphragm 29 to expand, transmitting the movement of the bellows extension point 9 to the bellows lever 6, which rotates around the hinge pin 3, and connecting the range screw 7 and cam arm 4. Overcoming the tensile force of the range spring 8 (tension spring) between them, the switch spring 15 is pushed through the bellows lever insulator 5 which is swaged with the bellows lever 6, and the inner toggle 19 is pushed down, and the inner toggle spring 20 and When the engaging portion is reversed to the lower side of the contact plate 16, the contact 22 comes into contact with the contact 23, and the switch is turned on. Furthermore, when the temperature of the temperature sensing part decreases, the gas sealed inside the power element 2 contracts.
The diaphragm 29 contracts and the tensile force of the range spring 8 prevails, so the tensile force causes the bellows lever 6 and the bellows lever insulator 5 to
is pulled up, the return force of the switch spring 15 lifts the inner toggle 19, and the engagement portion with the inner toggle spring 20 is reversed to the upper side of the contact plate 16, whereby the contact 22 is separated from the contact 23 and the switch is turned off.

When you want to change the set temperature, rotate the dial shaft 10 and press the cam 1 which is crimped.
1, the cam arm 4 is moved around the hinge pin 3, and the tensile force of the range spring 8 is changed. In other words, when the cam 11 is rotated and the cam arm 4 is moved to the left in FIG.
Since the tensile force of the range spring 8 increases, the contacts 22 and 23 come into contact when the pressure of the gas enclosed within the power element 2 is high (the temperature of the temperature sensing part increases). Moreover, if the cam 11 is turned in the opposite direction and the cam arm 4 is moved to the right in FIG. ) when contact 2
2 and 23 touch.

[Problems with background technology]

In refrigerators, air conditioners, etc. that use this conventional thermostat, if you want to temporarily cool down the inside of the refrigerator, room, etc., turn the dial and rotate the cam 11 with the dial shaft 10. , I achieved my goal by changing the tensile force of the range spring 8, but I often forget to return the dial to the appropriate temperature control state even when rapid cooling is no longer necessary. There is a risk of this happening, and it goes against the spirit of energy conservation.

[Purpose of invention]

The present invention was developed in view of the above-mentioned disadvantages, and only for one cycle in which rapid cooling is desired, the contact operating lever is forcibly operated using an external operating body separate from the dial shaft for adjusting the set temperature, and after the purpose is achieved, The purpose of this is to automatically release the forced operation of the contact actuating lever and operate in the original appropriate temperature cycle from the next cycle, to prevent the risk of excessive cooling, freezing, etc.

[Structure of the idea]

(Means for Solving the Problems) The present invention operates the cam arm 4 using the pressing force of the power element 2 that senses the temperature of the temperature sensing part and the cam 11 rotated by the dial shaft 10 for adjusting the set temperature. Range spring 8 adjusted through
In a mechanical thermostat that applies tensile forces of A reset lever 36 that is forcibly operated by the operating body 32 to forcibly operate the contact operating lever 6 against the range spring 8;
A reset lever spring is provided for providing a quick action to the reset lever 36 and maintaining the forced operating state of the reset lever 36 until the force relationship between these forces is reversed by a force acting against the power element 2 and the range spring 8. 44, which is stretched between the cam arm 4 and the reset lever 36, and presses the contact operating lever 6 via the reset lever 36 in a direction to cancel the increase in the tensile force of the range spring 8 caused by the rotation of the cam 11. Competition Spring 5
This is a thermostat consisting of 3.

(Function) In the present invention, by forcibly operating the external operating body 32, the contact actuating lever 6 is pushed through the reset lever 36 having a quick action by the reset lever spring 44, and the contact actuating lever 6 is forcibly turned on. When the temperature of the temperature sensor falls to the set temperature, as the pressing force of the power element 2 decreases, the tensile force of the range spring 8 overcomes the pressing force of the power element 2 and the reset lever spring 44, and the switch is automatically turned off. By returning to the normal thermo state, the first freeze function of refrigerators, air conditioners, etc. is achieved. Furthermore, when the tensile force of the range spring 8 is increased by rotating the cam 11 for adjusting the set temperature, the pressing force of the reset lever 36 against the contact operating lever 6 is also increased by the compensating spring 53. This cancels out the increase in the tensile force of the range spring 8, and as a result, the return temperature remains constant even if the set temperature is changed.

[Example of idea]

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in FIGS. 3 to 6.

In addition to the conventional structure shown in FIGS. 1 and 2, this embodiment forcibly brings the contacts 22 and 23 into contact with each other, cools the temperature rapidly, and then In order to add a mechanism for returning to normal temperature control by the cam 11, parts similar to those shown in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted.

That is, as shown in FIG. 3, a push rod 32 as an external operating body separate from the dial shaft 10 is fitted into the inner hole 31 of the dial shaft 10 for adjusting the set temperature so as to be movable forward and backward. The lower part 33 of the push rod 32 is curved to the right in the drawing, and has a small diameter operating portion 34 at its tip. In addition, a center portion of a reset lever 36 is rotatably supported on the main body 1 via a hinge pin 35 on the other side of the small-diameter operating portion 34 . This reset lever 3
6 is provided with legs 37 and 38 on both sides, and the small-diameter operating portion 34 of the push rod 32 is engaged with the leg 37 on the left side in the drawing, and the tip of this left leg 37 is used as a contact operating lever. The bellows lever 6 is made to face the upper surface of the bellows lever 6 so as to be able to freely approach and separate.

In addition, a support plate 41 fixed to the right end of the main body 1 as shown in the figure
The adjustment screw 42 is screwed together, and the tip 43 of the adjustment screw 42 and the right leg 3 of the reset lever 36 are connected to each other.
A reset lever spring 44 (compression spring) is interposed between the reset lever 36 and the reset lever 36, and the reset lever spring 44 moves the reset lever 36 either clockwise or counterclockwise around the hinge pin 35. Press.

To explain the operation of the embodiment shown in FIGS. 3 and 4, in the case shown in FIG.
This is a normal setting temperature adjustment state, and the sealed gas pressure in the power element 2 causes the contacts 22 and 23 to open and close in the same way as shown in Figures 1 and 2, automatically turning the switch on and off. let

In addition, in the case shown in Figure 4, contact 2 is used for rapid cooling.
2 and 23 are forcibly brought into contact and the switch is forcibly turned on. To turn the switch on, the push rod 32 is pushed in, the reset lever 36 is rotated counterclockwise around the hinge pin 35, and the switch is forcibly turned on. The bellows lever 6 is pushed down by the leg 37 on the left side of the reset lever 36 in the figure, bringing the contacts 22 and 23 into contact, and the reset lever 36 in this state is turned into the reset lever spring which has been reversed upward by the above rotation of the reset lever 36. 44.

The force relationship at this time is that the power element 2 pushes the bellows lever 6 clockwise, and the reset lever spring 44 pushes the reset lever 36, compared to the force of the range spring 8 pulling the bellows lever 6 counterclockwise. The resultant force of the force that presses the bellows lever 6 clockwise through the bellows lever 6 is greater. Therefore, forced contact between the contacts 22 and 23 can be maintained.

Furthermore, due to the contact between these contacts 22 and 23, the compressor of the refrigerator, air conditioner, etc. operates continuously, and as the temperature inside the refrigerator and the room decreases, the gas pressure inside the power element 2 decreases, so that the range spring 8 The force that pulls the bellows lever 6 counterclockwise is relatively stronger, and the bellows lever 6 rotates counterclockwise around the hinge pin 3. At this time, the bellows lever 6 rotates the reset lever 36 clockwise, flips the spring 44 downward, and the forced-on state of the switch is automatically released. This forced-on release temperature (return temperature) of the switch can be freely set using the adjusting screw 42.

However, since this thermostat has a mechanism that allows the set temperature to be changed by rotating the cam 11, in other words, when the cam 11 is rotated, the cam arm 4 moves and the tensile force of the range spring 8 changes. , the switch forced-on release temperature (return temperature) may also change. Therefore, in order to solve this problem, it is necessary to cancel the change in the tensile force of the range spring 8, which increases or decreases by rotating the cam 11, when the switch is forced on. 51 and the engaging part 52 on the upper surface of the reset lever 36
A competition spring 53 is stretched between the two. When the tensile force of, for example, the range spring 8 increases due to movement of the cam arm 4, the spring 53 pulls the reset lever 36 more strongly in the counterclockwise direction around the hinge pin 35 by the increased amount, and returns the reset lever 36 to the left side. By increasing the pressing force of the leg portion 37 against the bellows lever 6, the increase in the tensile force of the range spring 8 can be canceled out. By this, cam 1
No matter what position 1 is in, it can be lowered to a certain return temperature.

For example, if the cam 11 is as shown in FIG.
The recovery temperature (c) is the same both when set to WARM (a) and when set to COLD (b) as shown in FIG. In the figure, reference numeral 54 indicates a forced-on point of the switch, and reference numeral 55 indicates a return point at which the forced-on switch is automatically released and rapid cooling is stopped.

[Effect of idea]

According to the present invention, in a mechanical thermostat in which the pressing force of a power element that senses the temperature of the temperature sensing part and the tensile force of a range spring act in opposite directions on the contact operating lever, the contact operating lever A reset lever that is forcibly operated by an external operating body separate from the dial shaft for adjusting the set temperature and forcibly operates the contact operating lever against the range spring; and a reset lever that is provided for the reset lever. The present invention is characterized by comprising a reset lever spring that provides a quick action to the reset lever and maintains the forced operating state of the reset lever together with a power element by a force that resists the range spring until the relationship between these forces is reversed. With this configuration, the reset lever, which is forcibly operated by an external operating body and held in that state by the reset lever spring, presses the contact operating lever to maintain the switch forced on, rapidly cooling high temperature objects. In addition, by reversing the force relationship of the range spring to the power element and reset lever spring, the forced on switch is automatically released, and the normal cam-based temperature control is automatically restored, allowing complete freezing. It is possible to prevent wasteful use of energy and electricity, and to respond to user requests.

Furthermore, a compensating spring is installed between the cam arm and the reset lever that presses the contact operating lever via the reset lever in a direction that cancels out the increase in tensile force of the range spring caused by rotation of the cam. By rotating the temperature adjustment cam, even if the cam arm moves and the tensile force of the range spring increases, the compensating spring can cancel out the increase in the tensile force of the range spring. Even if the set temperature is changed, the return temperature can be kept constant.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional thermostat.
Fig. 2 is a sectional view showing the switch in the automatic on state, Fig. 3 is a sectional view showing an embodiment of the thermostat of the present invention, Fig. 4 is a sectional view showing the switch in the forced on state, and Fig. 5 is a sectional view showing the thermostat in the automatic on state. FIG. 6 is a graph showing the operation of the thermostat of the present invention when the set temperature is WARM and COLD, respectively. 2...Power element, 4...Cam arm,
6... Bellows lever as a contact actuation lever,
8... Range spring, 10... Dial shaft, 11... Cam, 22, 23... Contact, 32
...Push rod as an external operating body, 36...
...Reset lever, 44...Reset lever spring, 53...Competitive spring.

Claims (1)

[Claim for Utility Model Registration] The pressing force of a power element that senses the temperature of the temperature sensing part, and the tensile force of a range spring adjusted via a cam arm by a cam rotated by a dial shaft for adjusting the set temperature. In a mechanical thermostat that acts on a contact operating lever in mutually opposite directions, the thermostat is forcibly operated by an external operating body that is provided on the contact operating lever and is separate from the dial shaft for adjusting the set temperature. A reset lever that forcibly operates the contact actuating lever against the range spring, and a reset lever provided for this reset lever that provides a quick action to the reset lever and controls the forced operation state of the reset lever with a power element that resists the range spring. a reset lever spring that maintains these force relationships until they are reversed by the force of A thermostat characterized by comprising a compensating spring that presses a contact operating lever via a lever.