JPS5914661B2 - thermal response device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a thermal response device equipped with a valve mechanism and an electric contact mechanism used in refrigeration and refrigeration circuits.

(b) Conventional technology and problems In the refrigeration circuit, the hot water temperature on the surface of the evaporator or inside the refrigerator is usually detected, and when the hot water temperature falls below a predetermined level, the compressor operation circuit is completely switched off and the hot water temperature is detected. A valve provided upstream of the pressure reduction mechanism is closed to prevent refrigerant from flowing into the evaporator.

By the way, in the past, since the refrigerant was controlled by a solenoid valve, a switch for controlling the solenoid valve and a switch for controlling the compressor were required, resulting in a complicated configuration and high cost.

Therefore, a system was developed in which the valve mechanism and compressor control switch were controlled by a single thermally responsive member (bellows).
It is shown in Japanese Patent No.-42368.

That is, as shown in FIG. 8, there is a switch mechanism 53 that performs a snap operation by the operation of an actuation plate 52 that can adjust the load of a spring 51 in response to the expansion and contraction of a bellows 50, and an actuation pin 55 of a diaphragm valve 54. It consists of a valve actuation plate 56 having a diameter and an actuation rod 51 interposed between the actuation plate 52 and the actuation rod 51.

Therefore, as the bellows 50 expands and contracts, the switch mechanism 53 snaps due to the displacement of the actuating plate 52;
The diaphragm valve 54 rotates the valve actuating plate 56 by the actuating rod 51 to which the displacement of the actuating plate 52 is transmitted, and operates by pushing up the actuating bottle 55, so there is a time lag and the switch mechanism 53 and the diaphragm valve 54 are not synchronized. It was difficult to predict the operation.

Also, as shown in Figure 9, British patent No. There is one described in the specification of No. 1312718.

That is, in response to the expansion and contraction of the bellows 60, the spring 6
1; a second lever 64 disposed on the second lever 62 via a toggle spring 63; and a spring mechanism 65 operated by the operation of the second lever 64. , a third lever 67 that comes into contact with an adjusting screw 66 provided on the second lever 64, and a valve operating lever 68 that penetrates a fluid sealing diaphragm 69 that is operated by the third lever 61. .

Therefore, as the bellows 60 expands and contracts, the first lever 6
The switch mechanism 65 is activated by the rotation of the second lever 64 which snaps into action via the toggle spring 63 due to the displacement of the switch mechanism 65.
The rotation of the second lever 64 is transmitted to the third lever 67 via the adjustment screw 66, and the valve operating lever 68 is operated, so that the switch mechanism 65 is opened and closed and the valve operating lever 68 is operated. In order to achieve synchronization, it is necessary to provide all of the adjustment screws 66 on the second lever 64, resulting in a complicated structure and problems in operation due to the synchronization adjustment.

Further, the valve operating lever 68 is connected to the fluid sealing diaphragm 6.
9, there is a risk of fluid leaking to the outside, particularly in a closed fluid circuit such as a refrigeration circuit, there is a problem of refrigerant leakage n.

(c) Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional example, and provides a switch for opening and closing a compressor operation control switch in response to the expansion and contraction of a thermally responsive member (bellows), and a switch provided on the upstream side of a pressure reduction mechanism. Is it possible to synchronize the opening and closing operations of valves to prevent refrigerant leakage to the outside without the need for synchronization adjustment means? The objective is to provide a thermally responsive device that can

(d) Structure of the Invention In order to achieve the above-mentioned object, the present invention includes a bellows that expands and contracts in accordance with the sensing force in a heat-sensitive part, and a first actuating plate that abuts one end of the bellows and whose spring load can be adjusted. , a second actuation plate disposed on the first actuation plate via a toggle operation plate spring, and an electric contact mechanism and a valve mechanism respectively provided opposite to each other at the tip inverted position of the second actuation plate. The valve mechanism consists of a magnetic valve element that opens and closes in response to the contact and separation of a magnet provided at the tip of the second operating plate, and a valve case that houses the entire valve element. Covering the non-magnetic cap and force-ra consists of n1 said second
The electric contact mechanism and the valve mechanism are linked and operated synchronously by the toggle action of the actuating plate.

(e) Embodiment of the invention FIGS. 1 to 3 show an embodiment of a thermally responsive device. In FIG. It is connected.

The bellows 3 expands and contracts as the internal gas pressure increases and decreases, and the expansion and contraction action is performed by the first actuating plate 4.
It is designed to give rotational motion to.

That is, this first actuating plate 4 has side ends 4 a y 4 a
' is pivoted to the side plate 5°5' (third
(see figure), push the protrusion 4b with the bellows 3 gfl
Although it is designed to rotate counterclockwise in FIG. 1, a clockwise rotational force is normally applied by a tension spring 8 suspended between it and the adjustment plate 6 via a screw 7. Since the bellows 3 is contracted, it returns to its original state.

Reference numeral 9 denotes a screw for completely holding down the leaf spring 10 for preventing the screw 7 from rotating.

Further, the adjustment plate 6 is in pressure contact with the cam plate 11, and when the rotating shaft 12 is rotated and the cam plate 11 is rotated, the adjustment plate 6 is displaced and the tension of the tension spring 8 is adjusted. It looks like this.

13 is a second operating plate, which is rotatably supported on the side plates 5, 5' at side ends 13a, 13a';
A magnet 14 is fixed to the lower surface of the tip, and between the bottom of the V-shaped notch 13b and the tip of the first actuating plate 4,
A toggle operation plate spring 15 bent into a U-shape is attached (see FIG. 3).

In this case, as described above, the first actuating plate 4 and the second actuating plate 13
For example, when the first actuating plate 4 rotates counterclockwise in FIG.
moves clockwise and further bends, so when the first actuating plate 4 rotates to a certain angle, the second actuating plate 13 receives the elastic force of the leaf spring 15 and reverses clockwise.

In this state, when the first actuating plate 4 next rotates clockwise, the second actuating plate 13 returns counterclockwise due to the action of the temporary spring 150 similar to the above.

In other words, the first actuating plate 4, the second actuating plate 13, and the leaf spring 15 constitute the entire toggle mechanism in which the first actuating plate 4 is the human power part and the second actuating plate 13 is the output part.

16 is a screw for setting the stop position when the second actuating plate 13 rotates clockwise.

Reference numerals 17 to 19 are contacts constituting an electrical contact mechanism, and when the electrically insulating push-up rod 20 is raised, the movable contact 1
8 is switched to a fixed contact 177:l-etc. 19 (see FIG. 2).

This push-up bar 20 is pushed up by its tip when the second operating plate 13 is reversed clockwise in FIG. 1.

Reference numeral 21 denotes a piston made of a magnetic material, which moves the ball valve body 23, which is biased by the compression spring 22 by the rod 21a at the lower end, toward and away from the valve seat 24a of the valve case 24 by moving up and down. There is.

A compression spring 26 inscribed in a non-magnetic cap 25 placed over the top of the piston 21UJP case 24 normally biases the ball valve body 23 in the direction of separating it from the valve seat 24a7). When the magnet 14 at the tip of the second actuating plate 13 comes into contact with the cap 25, the attraction force of the magnet 14 rises against the force of the compression spring 26, and as a result, the ball valve body 2
3 to close the valve seat 24a.

The bridge, magnet 14, piston 21, compression spring 22, 26, ball valve body 23, valve case 24, etc.
It constitutes a valve mechanism.

2T is an inlet, and 28 is an outlet.

In the above, when the temperature in the heat sensitive part 1 rises, the internal gas pressure increases, so the bellows 3 expands and the first
The actuating plate 4 is pushed by the bellows 3 and rotates counterclockwise in FIG. 1, which causes the second actuating plate 13 to reverse clockwise and the magnet 14 to rise as shown in FIG. The ball valve body 23 opens the valve seat 24ak, and the movable contact 18 is pushed by the push-up rod 20 and comes into contact with the fixed contact 19.

When the temperature in the heat sensitive part 1 decreases, the internal gas pressure decreases and the bellows 3 contracts, and the first actuating plate 4 rotates clockwise in FIG. 1 due to the tensile force of the tension spring 8. As a result, the second actuating plate 13 returns counterclockwise, the magnet 14 comes into contact with the cap 25, the piston 21 is attracted and rises, the valve seat 24a closes, and the movable contact 18 suddenly contacts the fixed contact 17. Self-recovery and contact.

The relationship between the reversal and return operation of the second operating plate 130 and the expansion and contraction operation of the bellows 3 described above can be adjusted by the cam plate 11.

That is, if the cam plate 11 is rotated fully, the tension spring 8
If the tension of changes, for example, increases the tension, then
When the gas pressure in the bellows 3 is higher than before, that is, when the temperature in the heat sensitive part 1 is high, the toggle mechanism operates to open and close the valve mechanism and the electric contact mechanism.

Conversely, if the tension of the tension spring 8 is weakened, the opening and closing can be performed at low temperatures.

That is, the external pressure applied to the bellows 3 by the tension spring 8 changes, and the relationship between the gas pressure inside the bellows 3 and expansion/contraction is adjusted.

The adjustment screw 16 also adjusts the temperature at which the second actuating plate 13 returns counterclockwise when the temperature changes from high temperature to self, among the results of adjustment by the cam plate 11, and the temperature at which the lock valve mechanism is adjusted. This is for finely adjusting the temperature when the contact is closed (when the movable contact 18 switches from the fixed contact 19 to the fixed contact 11).

FIG. 4 is a diagram showing a refrigerant circuit for temperature control of a refrigeration system using the above-described thermal response device, and FIG. 5 is a diagram showing an electric circuit.

The thermally responsive device 34 of this embodiment is inserted between the condenser 31 and the restrictor 32 in the loop consisting of the compressor 30, condenser 31, aperture 32, and evaporator 33, and the valve of the thermally responsive device 34 in this case is The mechanism is to stop the compressor 30. This prevents the refrigerant from flowing due to the differential pressure between the evaporator 33 and the number of people.

That is, the heat sensitive section 1 of the thermal response device 34 is connected to the evaporator 3.
When the temperature rises rapidly to a predetermined value, the valve mechanism opens and the movable contact 18 contacts the fixed contact 19, causing the compressor 30 to operate and the evaporator 33 to cool down. Ru.

When the temperature drops to a predetermined value, the valve mechanism closes and the compressor 30 stops operating.

Figure 6 shows the opening and closing of the valve mechanism by temperature sensing and compressor 3.
FIG. 2 is a diagram showing ON and OFF characteristics of 0;

In this case, this characteristic can be tilted in the direction of the arrow by rotating the cam plate 11.

1. If you adjust the adjustment screw 16, the characteristic curve "Valve opening/ONJ
"The valve closing/0FFJO difference can be adjusted.

In the above embodiment, the ball valve body 23 of the valve mechanism opens the valve seat 24ak when the hot water temperature rises, but the valve mechanism is configured as shown in FIG. 7 showing another embodiment 4. It is also possible to close the valve mechanism by this.

The configuration shown in FIG. 1 will be explained below.

Note that the same reference numerals as in FIGS. 1 to 3 indicate the same members, and explanations thereof will be omitted.

Reference numeral 35 denotes a valve body made of a magnetic material, which opens and closes the inlet 2γ and the outlet 028 by moving up and down.

This valve body 35 is housed in the valve case 31 by a non-magnetic cap 36, and is normally held by a compression spring 38 against the valve seat 37a. However, when the magnet 14 at the tip of the second actuating plate 13 comes into contact with the cap 36, it receives the suction force of the magnet 14 and rises against the force of the compression spring 38, closing the valve. seat 37
ak is set to open.

(f) Effects of the invention (a) The electric contact mechanism and the valve mechanism are operated by the reversal operation of only the second actuating plate which performs toggle operation due to the displacement of the first actuating plate in response to the expansion and contraction of the bellows. It is possible to synchronize with a simple configuration without requiring any synchronization adjustment for the operation.

(b) Since the refrigerant circuit can be quickly disconnected when the compressor stops operating, refrigerant is prevented from flowing into the evaporator, resulting in energy savings.

(c) Since the valve is opened and closed by magnetic force, the entire valve chamber can be completely sealed from the outside by the valve case and the cap, and no external leakage of refrigerant occurs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a thermally responsive device according to an embodiment of the present invention, and FIG.
The figure is a partial cross-sectional side view of the same device, Figure 3 is a partial plan view of the same device with the bellows removed, Figure 4 is a refrigerant circuit diagram of a cooling device using the same device, and Figure 5 is the same cooling device. 6 is a characteristic diagram of the same cooling device, FIG. 7 is a sectional view of another embodiment, and FIGS. 8 and 9 are sectional views of a conventional example. 1... Heat sensitive part, 3... Bellows, 4.
...First operating plate, 6...Adjustment plate, 11.
...Cam plate, 13...Second operating plate, 14
...Magnet, 15...Plate spring for toggle operation, 17-19...Contact, 21...
...Piston, 23...Ball valve body, 24...
...Valve case.

Claims (1)

[Claims] 1. A bellows that expands and contracts in response to heat sensitivity at a heat-sensitive part, a first actuating plate that abuts one end of the bellows and whose spring load can be adjusted, and a toggle plate spring disposed on the first actuating plate. a second actuating plate, and an electric contact mechanism and a valve mechanism provided opposite to each other at the reversed position of the tip of the second actuating plate, the valve mechanism being provided at the tip of the second actuating plate. A thermally responsive device comprising: a magnetic valve body that opens and closes in response to the contact and separation of a magnet; and a non-magnetic cap that covers a valve case entirely inside the valve body.