JPS62110220A - Temperature regulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature controller that controls the temperature of electric refrigerators, freezers, showcases, etc. More specifically, even if the temperature control dial is rotated, the temperature changes. This relates to a constant temperature return type temperature regulator in which the ON temperature is constant.

Prior Art As a prior art, there is an example as shown in Japanese Utility Model Application Laid-Open No. 54-45979. 1 as shown in Figure 4
is a bellows that causes pressure changes depending on temperature. Reference numeral 2 denotes a lever that comes into contact with the bellows 1 and is rotatable, and is equipped with a switch 3 that is opened and closed by the rotation of the lever 2. The lever 2 is biased by a first spring 4 in a direction opposite to the output of the bellows 1. Furthermore, it is rotatably attached to the container frame 5, one end engages with the stopper 6 of the container frame 6, and
There is an arm 8 which is connected to the lever 2 via an adjustable screw 7. Also, one end is interlocked with a cam 9 rotatably attached to the container frame 5, and the other end is connected to a second spring 1.
0 is attached to the cam arm 11, and the second
The spring 10 is configured to be secured to the arm 8 described above.

Here, when the temperature rises and bellows 1 expands, lever 2
rotates counterclockwise, resisting the bias of the first spring 4 and turning on the switch 3.

Since the force of the second spring 10 that is bent does not move the arm 8 beyond the position at the stopper θ of the container frame 6, it is necessary to adjust the screw 7 so that it does not come into contact with the lever 2 in the ON position. , regardless of the position of the cam 9, the ON temperature is the first
Since it is controlled only by the spring 4, it remains constant.

Conversely, when the temperature drops, the bellows 1 contracts, the lever 2 rotates clockwise, and the switch 3 is turned off. At this time, the lever 2 must come into contact with the screw 7 before reaching the OFF position, and the switch 3 must be turned OFF via the arm 8 against the bias of the second spring 1o.

The cam bottom surface 12 is displaced depending on the rotational position of the cam arm 11 contact surface, and the cam arm 11 is displaced together with the cam 9. Therefore, when the dial is turned to rotate the cam 9, the cam arm 11 is also displaced in conjunction with the second spring 10. The tension also changes. Therefore, the spring force applied to the lever 2 also changes, making it possible to adjust the OFF temperature.

Problems to be Solved by the Invention In the prior art, the adjustment of the OFF temperature is
Since this was done by changing the tension of the spring 1o, it was easy to make adjustments, but on the other hand, the second spring 10 and the cam 9
In addition, the interlocking cam arm 11° between the second spring 10 and the lever 2 requires the lever 2 and three shaft rotating parts, which makes it difficult to assemble. Since the second spring is also a coil spring, there is a possibility that the assembly man-hours will increase.

Means for Solving the Problems The present invention includes a pressure-responsive element filled with a gas that causes a pressure change due to a temperature change in a control section, a lever that is in contact with the pressure-responsive element and is rotatable about one end as an axis; A temperature regulator having a switch that opens and closes with rotation of the lever, a first spring fixed to the lever and biased in a direction opposite to the output of the pressure responsive element, and a second spring fixed at one end to the lever. It is rotatably attached to the container frame, one end abuts a cam attached to the container frame, and has an arm that is linked to the displacement of the cam and has an externally adjustable adjustment screw screwed into the center part. The tip of the adjustment screw and the second spring are in contact with each other, and the contact position of the adjustment screw and the second spring can be freely adjusted;
When the cam is rotated, the arm position changes and the position where the arm joins with the second spring fixed to the lever via the adjustment screw changes, and the spring force to the OFF position changes, resulting in a change in the OFF temperature. The configuration is such that the changes occur.

Function To explain the function of the present invention, the gas pressure within the pressure-responsive element changes as the temperature changes, and as the temperature rises, the pressure increases and the pressure-responsive element tends to expand. The lever in contact with the lever rotates around the shaft and turns on the switch by resisting the spring force of the first spring. If the adjustment screw is adjusted so that the arm interlocked with the second spring via the adjustment screw is separated at the ON position, the second spring will not be involved at the ON position. Conversely, when the temperature decreases, the pressure decreases, the pressure-responsive element contracts, and the lever attempts to turn the switch to 0FFL. Here, in the position before turning off, the second spring fixed to the lever contacts the arm via the adjustment screw. Here, the position of the arm is displaced in conjunction with the displacement due to the rotation of the cam, so the second spring comes into contact with the arm via the adjustment screw due to the rotation of the cam, and the lever is turned OFF against the force of the second spring. The force of the stopper rotating to the desired position changes.

As a result, a constant temperature return type temperature regulator is constructed in which only the OFF temperature changes by the rotation of the cam.

Example An embodiment of the present invention will be described using FIGS. 1 and 2.

21 is a pressure-responsive element (hereinafter referred to as a diaphragm) in which gas is sealed, and 22 is a temperature sensing capillary 22 of the control section. The diaphragm 21 is fixed by solder or the like to a housing 24 having a U-shaped notch 23 at one end. Furthermore, the diaphragm 21 is connected to a V-shaped wall provided on two parallel side wall end surfaces of the container frame 26 via a spacer 26.
It comes into contact with the lever 2 whose fulcrum is positioned at the letter-shaped notch 26'. Here, the lever 27 consists of two vertically bent legs 28, a protrusion 29 that abuts the spacer 26, a fulcrum 30 that engages with the V-shaped notch 26' of the container frame 26, and a central portion A second spring 31 formed in an L-shape is fixed to the reversing switch 32, and a switch rod 50 made of an insulator for opening and closing the reversing switch 32 is snapped in. Further, a first spring 33 is fixed to the vertical leg 28 of the lever 27. The other end of the first spring 33 is in contact with the cut-and-raised portion 34 of the bottom wall of the container frame 26, and biases the lever 27 with a force in the opposite direction to the output of the diaphragm 21. In addition, a plate spring 3 is attached to the bottom wall of the container frame 26.
There is a rotatable cam 36 which is stopped at 5, and a cam surface 37 of the cam 36 is displaced in the axial direction. One end is in contact with this cam surface 37, and the other end is attached to the side wall of the container frame 26 with a pin 38.
There is an arm 41 in the center of which is screwed an adjustment screw 4o that is freely screwed into the hole 39 provided in the bottom wall of the container frame. It is held by a stopper 42 provided on the side wall of. Here, the tip of the adjustment screw 4o is connected to the lever 2.
It is arranged at a position where it can come into contact with one end of the second spring 31 fixed to the spring 7 .

The container frame 26 consists of two side walls and a bottom wall, and has the V-shaped notch 26' at one end of the side wall and four projections 43, by which the nozzle 24 is fixed.

Furthermore, there are two cutouts 44 at each end of the side wall. The switch part includes a case 46 made of an insulator and a reversing switch 3.
2 and a differential screw 46 that can vary the operating distance of the reversing switch 32, and the differential screw 46 is connected to the case 45.
It is screwed on. Furthermore, it is composed of two terminals 47 which are caulked to the case 46 and contacts 48 which are connected to these terminals 47. Here, two recesses 49 are formed on each side of the case 46, and are joined by the cutout portions 44 of the container frame 25.

Next, to explain the operation, the capillary 22 transmits the temperature change of the control section, and when the temperature rises, the internal pressure of the sealed gas increases, and the diaphragm 21 tries to expand, and conversely, when it falls, the diaphragm 21 tries to contract. First, consider the case where the temperature rises and the switch is turned on.

The diaphragm 21 tries to expand and tries to rotate the lever 27 about the fulcrum via the spacer 24. In response to this, the first spring 33, which is fixed to the vertical foot 28 of the lever 27 and whose other end is engaged with the cut-and-raised part 34 on the bottom wall of the container frame 26, is deflected and exerts a spring force. Occur. The lever 27 rotates due to the balance of the above two forces,
Reverse switch 3 via switch rod 60 at set temperature
Turn on 2.

Here, the set temperature can be determined by changing the operating distance of the reversing switch 32 using the differential screw 46 and by varying the spring force of the first spring 33.

Further, if the second spring 31 fixed to the lever 27 and the arm 41 are prevented from coming into contact with each other by adjusting the adjustment screw 40 in the ON position, the second spring 31 will not be affected by the ON temperature.

Next, consider the state when it is OFF. As the internal pressure decreases, the diaphragm 21 begins to contract, and the lever 27 rotates in the opposite direction from 08:00. When the adjustment screw 40 is adjusted so that the arm 41 contacts the second spring 31 fixed to the lever 27 before the reversing switch 32 is turned off, the lever 27 resists the spring force of the second spring 31 and adjusts the temperature. Turn it off. Here, when the cam 36 interlocked with the temperature power saving dial is rotated, the cam surface 37 is displaced in the axial direction, so the arm 4 in contact with the cam surface 37 is displaced in the axial direction.
1 causes a position change, and the second spring 31 and arm 41
Since the contact position of the second spring 31 changes and the spring force of the second spring 31 at the OFF position changes, only the OFF temperature can be adjusted.

Here, the contact position of the second spring 31 must be made within a minute distance between the ON and OFF strokes of the reversing switch 32, or in the present invention, the contact position of the second spring 31 must be
The contact position of the second spring 31 was set at a location away from the fulcrum of the lever 27, and the movement of the second spring 31 was expanded to about three times the movement of the reversing switch 32, to approximately 0.9 HIl. Since the displacement of the cam surface 37 is also small, the ratio of the distance from the fulcrum of the arm 41 at the adjustment screw 404 to the distance at the contact portion 1 of the cam surface 37 is set to 1:6, and the cam surface 37
The structure is such that the displacement is reduced and transmitted.

Therefore, as shown in Figure 3, the return temperature is constant.

The contact opening temperature has a characteristic that changes depending on the setting position of the dial.

Effects of the Invention As described above, there is a pressure-responsive element filled with gas that causes a pressure change due to temperature changes in the control section, a lever that is in contact with the pressure-responsive element and is rotatable around one end, and the rotation of the lever. In a temperature controller that has a reversing switch that opens and closes,
A first spring fixed to the lever and biased in a direction opposite to the output of the pressure-responsive element, a second spring fixed at one end to the lever, and a cam attached to the container frame are brought into contact with each other to cause displacement of the cam. It has an arm with an externally adjustable adjustment screw screwed into the center thereof, and is arranged at a position where the tip of the adjustment screw can come into contact with the second spring, and where the adjustment screw and the second spring can come into contact with each other. Since the contact position can be freely adjusted, the temperature on the return side depends only on the first spring and remains constant regardless of the dial, and the contact opening temperature is controlled via the shear adjust screw by the displacement of the cam linked to the rotation of the dial. Since the contact position between the arm and the second spring changes between the contact return and release of the reversing switch, the spring force of the second spring changes depending on the contact position and is transmitted to the lever and adjusted.

For this reason, the only necessary parts are the arm and adjustment screw, and the second spring is fixed to the lever, so the number of parts is small and assembly is easy, making it possible to create a low-cost temperature controller that is not practical. Very useful.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a temperature regulator according to an embodiment of the present invention;
The figure is an exploded perspective view of the temperature regulator, FIG. 3 is a temperature characteristic diagram of a constant temperature return type temperature regulator, and FIG. 4 is a sectional view of a conventional temperature regulator. 21... Pressure response element, 27... Lever, 26... Instrument frame, 31... Two cylinders with two tin rings, 32... Switch, 33... ...1st sprink, 36...cam, 4o...adjustment screw, 41...arm.

Claims (1)

[Claims] a pressure-responsive element filled with gas that causes a pressure change due to a temperature change in the control section; a lever that contacts the pressure-responsive element and is rotatable around one end; and a switch that opens and closes by rotation of the lever; a first spring fixed to the lever and biased in a direction opposite to the output of the pressure responsive element; a second spring fixed at one end to the lever; and a second spring rotatably attached to the container frame, one end of which is attached to the container frame. The arm is arranged in a position where the tip of the adjustment screw can come into contact with the second spring, and has an externally adjustable adjustment screw screwed into the center of the arm. A temperature regulator characterized in that the position of contact between the adjustment screw and the second spring can be freely adjusted.