JPS5841460Y2 - All-air temperature detection device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an all-air type temperature sensing device.

When detecting temperature in an explosive atmosphere, the temperature detection device must have an explosion-proof structure.

Conventional all-air type temperature detection devices have electrical contacts housed in an explosion-proof housing, so they cannot be considered completely all-air type, and they also have the disadvantage that the explosion-proof housing becomes larger and the overall cost increases. there were.

The object of the present invention is to provide a complete all-air type temperature sensing device without electrical contacts.

FIG. 1 shows an embodiment of the present invention.

As shown in the figure, the all-air type temperature detection device of this embodiment has a temperature sensing section 1 which contains a liquid and is installed in the part where the temperature is to be detected.
A, a bellows part 1B that expands and contracts due to the expansion and contraction of liquid in response to temperature changes, and a conduit part 1C that communicates the two, and a volumetric temperature sensor 1 that converts temperature changes into long displacements. have

A fine adjustment mechanism 2 for finely adjusting the setting position is provided on one side of the bellows portion 1B.

This fine adjustment mechanism 2 includes a nut part 2A supported by a fixed body 3, and a fine adjustment screw part 2B which is screwed onto this nut part 2A and whose tip is in contact with one surface of a bellows part 1B.
It is composed of:

A protrusion 4 is protruded from the center of the other surface of the bellows portion 1B, and the tip of the protrusion 4 is brought into contact with one surface of the deflection lever 5A.

One end of this deflection lever 5A is pivotally supported by the fixed body 6, and the other end is free.

One end of a spring 7 is brought into contact with the opposite surface of the deflection lever 5A, and presses the lever 5A in the opposite direction to the direction in which it is pressed by the bellows portion 1B.

Therefore, the deflection lever 5A is in a neutral state when the pressures acting on both sides are balanced, and the bellows portion IB11!
As the pressure of l changes, either side will be displaced to the other side.

The other end of the spring 7 is supported by a fixed body 8.

A protrusion 5B is protruded from the other end surface of the deflection lever 5A facing the bellows part 1B side, and this protrusion 5B comes into contact with the middle part of the deflection snap action piece 5C to cause the snap action to be applied to the snap action piece 5C. It is designed to let you do so.

One end of the snap action piece 5C is supported by the fixed body 9, and the other end is left free, and a flapper 5D made of a sealing member such as rubber is attached to the other free end.

The deflection lever 5A, the protrusion 5B, the pressure deflection snap action piece 5C, and the flapper 5D constitute the deflection body 5.

The flapper 5D is designed to take two positions, upward and downward, in accordance with the snap action of the snap action piece 5C.

On the flapper 5D side, there is provided a temperature/air display 10 that is controlled by the flapper 5D and displays pressure.

This temperature/air display body 10 has two sets of pipes 11 and 11.
The flow paths 12.12' have two sets of flow paths 12.12' formed by the inlet ports 12A and 12A' to which air is supplied at a predetermined pressure, and the first and second outlet ports 12A and 12A'. Part 1
2B, 12C, 12B'.

120', and constricted parts 12D and 12D' are formed between these inlet parts and the two outlet parts, respectively.

The cross-sectional area of the throttle parts 12D and 12D' is the same as that of the second outlet part 1.
It is set below the cross-sectional area of 2 C and 12 C'.

The second outlet portions 12C and 12C' are provided facing each other with the flapper 5D in between.

The flapper 5D has a second outlet section 12 below the set pressure.
C' is closed, and when the pressure exceeds the set pressure, the second outlet section 12C
It is designed to block the

Next, the operation of such an all-air type temperature detection device will be explained with reference to FIG. 1 and FIGS. 2A, B, and C.

As the temperature gradually increases from 0 as shown in Figure 2A,
This rise in temperature is detected by the temperature sensing portion IA of the volumetric temperature sensor 1, and the built-in liquid expands, causing the bellows portion 1B to expand accordingly.

The bellows part 1B is temporarily fixed at the top in the drawing, so
The deflection lever 5 of the deflection body 5 expands downward and moves through the protrusion 4.
This will gradually push down A.

When the temperature is lower than the set temperature T, the second outlet 12C' of one flow path 12' is closed by the flapper 5D,
The second outlet portion 12C of the other channel 12 is open.

Therefore, in the flow path 12', air is ejected only from the first outlet part 12B', in the flow path 12, most of the air is ejected from the second outlet part 12C, and from the first outlet part 12B. Almost no gushing.

In other words, when the temperature is lower than the set temperature T, the air signal from the first outlet section 12B is O as shown in FIG. 2B, and the air signal from the first outlet section 12B' is O as shown in FIG. Figure 2C
It is 1 as shown in .

As the temperature rises, the deflection lever 5A is pushed down, and when the temperature reaches or exceeds the set temperature T, the deflection snap action piece 5C is reversed and the flapper 5D is moved to the second outlet section 12C.
', and changes to a state where the second outlet portion 12C is closed.

In this state, in the flow path 12', most of the air is blown out from the second outlet part 120', and very little air is blown out from the first outlet part 12B', and in the flow path 12, most of the air is blown out from the second outlet part 120'. Air is blown out only from part 12B.

In other words, when the temperature is higher than the set temperature T, the air signal from the first outlet section 12B is 1 as shown in FIG. 2B,
The air signal from the first outlet 12B' is O as shown in FIG. 2C.

When the temperature exceeds the set temperature T, the air signal 1 from the first outlet section 12B controls the temperature to return it to the set temperature T, and the temperature drops as shown in FIG. 2A.

When the temperature falls below the set temperature T, the deflection lever 5A rises, the deflection snap action piece 5C reverses, and the pressure flapper 5D again closes the second outlet section 12C' and opens the second outlet section 12C. The first outlet section 12B'
With the empty air signal 1, the air signal from the first outlet portion 12B returns to O.

The same operation is repeated below. The temperature detection device described above has been described with reference to an example in which digital temperature detection is performed based on the set temperature T. Next, an example in which temperature detection is performed in an analog manner will be described with reference to FIG.

In FIG. 3, the same parts as in FIG. 1 are given the same reference numerals, and their explanation will be omitted.

In the all-air type temperature detection device of this embodiment, the flapper 5D is directly attached to the deflection lever 5A of the deflection body 5, and the deflection snap action piece is omitted.

In this way, the position of the flapper 5D changes in an analog manner as the volume changes, in other words, the temperature changes.

In addition, in the temperature air display body 10, the member 13 has a
The flow path 14 has an inlet portion 14A through which air is supplied at a predetermined pressure, and first and second outlet portions 14B and 14C, and has an inlet portion 14A and a first and second outlet portion 14B and 14C, and has an inlet portion 14A and a first outlet portion 14B and a second outlet portion 14C. A constriction portion 14D is formed in the diaphragm.

In such a temperature detection device, the distance between the second outlet section 14C and the flapper 5D changes in an analog manner as the temperature changes, so the amount of air ejected from the second outlet section 14C changes in an analog manner.

Therefore, the pressure of the air signal from the first outlet section 14B changes in an analog manner as the temperature changes, as shown in FIG. , the pressure of the air signal becomes constant.

The amount of cooling water is determined by using the analog variation range of the air signal.
Analog control of air volume, etc. can be performed.

The all-air type temperature detection device as described above can be used as an oil temperature detection device such as a lubricating oil supply device that atomizes and supplies lubricating oil into the air that is the driving source of an air pressure actuated device such as an air cylinder. can be used.

As explained above, the all-air type temperature detection device according to the present invention outputs the temperature as an air signal using the temperature/air display, so it does not have parts such as electrical contacts that generate sparks, and is completely explosion-proof. can be used.

In addition, the configuration for explosion-proof construction is very simple.
It can be provided at low cost.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the schematic configuration of the all-air type temperature detection device according to the present invention, Fig. 2 A-C is an explanatory diagram of the operation of Fig. 1, and Fig. 3 is the all-air type temperature detection device according to the present invention. FIG. 4 is a sectional view showing a schematic configuration of another embodiment of the apparatus, and FIG. 4 is a temperature/air signal pressure characteristic diagram of the apparatus shown in FIG. 3. 1... Volume type temperature detector, 1A... Temperature sensing part, 1C... Bellows part, 5... Deflector, 5A...・・Deflection lever, 5C・・・・・
Deflection snap action piece, 5D... flapper, 7... spring, 10... temperature/air indicator, 12.12'... channel, 12A, 1
2'...Entrance, 12B, 12B'...
- First exit part, 12C, 12C'... Second exit part.

Claims (3)

[Scope of utility model registration request] (1) A volumetric temperature sensor that outputs the temperature change to be detected as a volume change, a displacement lever on one side that operates according to the displacement of the temperature sensor, and a flapper that interlocks with the displacement lever. The temperature/air flow path includes a flow path having an inlet portion to which air is supplied, and first and second outlet portions provided beyond the inlet portion, and outputs an air signal from the first outlet portion in accordance with the detected temperature. An all-air type temperature detection device characterized by comprising a display body. (2) The flapper is attached to the tip of the snap-action piece, and the snap-action piece is linked to the operation of the displacement lever, and the temperature/air indicator has an inlet section and a first and second outlet section. two sets of flow passages, each having a second outlet, the second outlet portions of the two flow passages being disposed on either side of the pressure excursion member, whereby the pressure excursion member lowers the second outlet portions below a set temperature; One of the second outlet portions is closed and the other is opened, and when the temperature exceeds a set temperature, one of the second outlet portions is opened and the other is closed. Air type temperature detection device. (3) the flapper is directly supported by the deflection lever, the temperature/air indicator includes a pair of channels having an inlet and first and second outlets; The all-air type temperature sensing device according to claim 1, which is opposed to the second outlet portion so as to approach and move away from it in an analog manner according to pressure changes.