JPH034926Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a humidity detector that is installed in an air conditioner, a freezing room, etc., and generates a signal in response to changes in humidity.

(Prior Art) Generally, nylon ribbons have come to be widely used as the humidity sensing element of this type of humidity detector. This nylon ribbon has much better durability over time than conventional ribbons made of hair, etc., but the amount of expansion and contraction per unit is also very small. In other words, the amount of expansion and contraction of the nylon ribbon relative to the relative humidity is determined by adjusting the relative humidity (RH) from 20 to 80%.
Looking at the area, the elongation rate is at best 0.05 to 0.07% for a 1% change in relative humidity (RH). Therefore, if the length of the nylon ribbon is L, the elongation of the nylon ribbon for a 1% change in relative humidity (RH) is only L x 0.05 to 0.07% (mm). Therefore, in order to operate the signal generating switch by this amount of expansion and contraction, the length L of the nylon ribbon must be increased, and as a result, it is not possible to downsize the humidity detector.

Furthermore, in conventional humidity detectors of this type, there are those in which the humidity sensing elements are arranged in a V-shape, as well as in a straight line. When the switch is laid in a V-shape like this, the operating force is doubled compared to when it is laid in a straight line, so the reliability of the switch operation is increased. However, the amount of displacement is 1/2 of the total length of the moisture sensing element. That is, the amount of expansion and contraction corresponding to the length of each side of the V-shape is the amount of displacement. Therefore, in order to obtain a predetermined amount of displacement, the length of each side of the V-shape must be increased, which again makes it difficult to downsize the humidity detector.

For this reason, the inventors of the present invention previously proposed a humidity detector disclosed in Japanese Utility Model Publication No. 5639/1983. The humidity sensor proposed earlier has a humidity-sensitive nylon ribbon formed in a loop shape and double over its entire length.One end of the ribbon is hung on a fixing pin of the case, the other end is hung on a connecting pin, and the middle part is The ribbon is folded back around the outer periphery of at least one roller pin provided on the case at a distance from the fixed pin and the connecting pin, and the moisture-sensitive nylon ribbon is wrapped around the short side of the approximately L-shaped movable lever. In addition to attaching a connecting pin at the end, a switch operating body is attached to the tip of the long side of the movable lever, and a switch is provided that operates on and off as the switch operating body moves.

A movable lever is actuated by the expansion and contraction of the moisture-sensitive nylon ribbon, which displaces the switch operating body at the tip of the movable lever, and this displacement turns the switch on and off to output an electrical signal corresponding to humidity changes. However, by forming the moisture-sensitive nylon ribbon into a loop and making it double, the overall length and width can be reduced, making it possible to downsize.

(Problems to be Solved by the Invention) In the above-mentioned humidity detector, the movable lever is provided with an adjustment mechanism for adjusting the set humidity, that is, adjusting the operating point of the switch. That is, a support piece is provided in the middle of the long side of the movable lever,
When adjusting the operating point of the switch by screwing an adjustment screw whose tip touches the long side of the movable lever into this support piece, use the elastic force of the movable lever to adjust the operating point of the switch.
This is accomplished by bending the movable lever using an adjustment screw and changing the position of the switch operating body relative to the switch.

However, although it is possible to fine-tune the operating point with this configuration, since the adjustment is made by bending the movable lever, the relative humidity (RH) must be between 30 and 90.
It is unsuitable for adjusting the humidity setting over a wide range of 1.5% or for adjusting the length variation of the moisture-sensitive nylon ribbon. For example, once the movable lever is bent significantly, the movable lever may be permanently deformed and readjustment may become impossible. Furthermore, since the movable lever is pivotably attached to the case, when moving the adjustment screw forward or backward to bend the movable lever, a force is applied to rotate the movable lever.
Another problem is that accurate adjustment is difficult.

The purpose of this invention is to improve the humidity sensitivity, reduce the overall size, be able to respond to large changes in the set humidity, easily and accurately adjust a wide humidity range, and be easy to assemble. Our objective is to provide a humidity detector that can

[Structure of the idea]

(Means for Solving the Problems) The humidity detector of the present invention has a loop shape and is formed double over the entire length, one end of which is hung on the adjustment pin 13, and the other end is hung on the connecting pin 19. and a moisture-sensitive nylon ribbon 12 whose middle part is folded back around the outer periphery of at least one roller pin 15 provided in the case 11 while maintaining a distance from the adjustment pin 13 and the connecting pin 19; The moisture-sensitive nylon ribbon 1 has an adjustment mechanism 14 provided for the adjustment pin 13 at one end of the moisture-sensitive nylon ribbon 12, forming a substantially L shape, and a short side 17A of the moisture-sensitive nylon ribbon 1.
A movable lever 17 to which a connecting pin 19 at the other end of 2 is attached and a switch operating body 21 attached to the tip of the long side 17B, and a switch 24 that operates on and off as the switch operating body 21 moves. The adjustment mechanism 14 has an adjustment screw 14A rotatably passed through one end 11A of the case 11, and the adjustment pin 1 at the tip of the adjustment screw 14A.
3 is screwed together, a repulsion spring 14B is interposed between one end 11A of the case 11 and the holder 13A, and the adjustment pin 13 is inserted in the longitudinal direction of the moisture-sensitive nylon ribbon 12. It is supported so that it can be displaced along.

(Function) In the present invention, the movable lever 17 is actuated by the expansion and contraction of the moisture-sensitive nylon ribbon 12.
The switch operating body 21 at the tip of the ribbon 7 is displaced, and this displacement turns the switch 24 on and off to output an electrical signal corresponding to changes in humidity.The moisture-sensitive nylon ribbon 12 has an endless loop shape. Since the structure is double-layered as a whole, the total length is doubled, and compared to the conventional single-layer structure, twice the force can be obtained with the same dimensions.

In addition, when adjusting the set humidity, the adjustment mechanism 14
By turning the adjustment screw 14A and displacing the adjustment pin 13 at one end of the moisture-sensitive nylon ribbon 12 together with the holder 13A along the length direction of the moisture-sensitive nylon ribbon 12, it is possible to prevent large changes in the set humidity. I can respond accordingly. At this time, the moisture-sensitive nylon ribbon 12
The position change by the adjustment pin 13 at one end is in the longitudinal direction of the moisture-sensitive nylon ribbon 12, and a repulsion spring 14 is installed between the one end 11A of the case 11 and the holder 13A.
Since B is interposed, the holder 13A can be displaced without being affected by the backlash of the adjusting screw 14A, and its position relative to the case 11 can be accurately secured.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, 11 is a case, and this case 11
A moisture-sensitive nylon ribbon 12 formed double over the entire length in a loop shape is stretched inside the tube in a V-shape. That is, one end of this moisture-sensitive nylon ribbon 12 is hung on the adjustment pin 13, and the other end is hung on the connecting pin 19, and
The intermediate portion is hung on the outer periphery of a roller pin 15 provided in the case 11 at a distance from the adjustment pin 13 and the connecting pin 19, and is folded back in a V-shape around the outer periphery.

Reference numeral 14 denotes an adjustment mechanism, in which an adjustment screw 14A is rotatably passed through one end 11A of the case 11, and a holder 13A holding the adjustment pin 13 is screwed onto the tip of the adjustment screw 14A. Furthermore, a repulsion spring 14B is interposed between the one end 11A of the case 11 and the holder 13A, and the adjustment pin 13 is connected to the moisture-sensitive nylon ribbon 12.
It is supported so that it can be displaced along the length direction (horizontal direction in the drawing).

Reference numeral 17 denotes a movable lever that is approximately L-shaped. The L-shaped bent portion of the movable lever 17 is rotatably supported on the case 11 by a support pin 18, and a A connecting pin 19 is attached to the other end of the moisture-sensitive nylon ribbon 12, and a switch operating body, such as a magnet 21, is attached to the tip of the long side 17B.

Reference numeral 24 denotes a signal generation switch, for example a reed switch. This reed switch 24 is
Switch case 2 provided inside the case 11
3, and is turned on and off as the magnet 21 moves up and down in the drawing. and,
This operating signal is led out to the outside through a pair of terminals 25 that pass through the bottom of the switch case 23 and are connected to both ends of the reed switch 24.

Reference numerals 27 and 28 denote balance springs, and one spring 27 is stretched between the vicinity of the pivot portion of the movable lever 17 and the case 11, and applies an acting force to the movable lever 17 in the clockwise direction in the figure.
The other spring 28 is stretched between the vicinity of the tip of the movable lever 17 and the case 11, applies an acting force in the counterclockwise direction in the drawing, and also serves as a rest for the tip of the movable lever 17. And these springs 2
7 and 28 apply constant tension to the moisture-sensitive nylon ribbon 12 at all times, and reduce the operating force of the magnet 21 by the moisture-sensitive nylon ribbon 12.

As mentioned above, when using the reed switch 24 and opening and closing it, it is theoretically sufficient to satisfy the displacement amount of the magnet 21. In other words, in practice, the minimum amount of movement required to open and close the reed switch 24 is 0.8 to 1 mm, so if the length of the moisture-sensitive nylon ribbon 12 is 100 mm, the expansion and contraction per 1% relative humidity (RH) is 0.8 to 1 mm. The maximum amount is 100×0.07/100=0.07 mm based on the elongation rate. Therefore, considering the difference in humidity between opening and closing, that is, the differential (usually 1 to 2%), the movable lever 1
7 requires a magnification ratio of 10x.

Here, the enlargement ratio of the movable lever 17 is set to 10 times,
If the amount of expansion and contraction of the moisture-sensitive nylon ribbon 12 is 0.07 mm, the movement of the tip of the magnet 21 is 0.07 x 10 =
0.7mm, and the differential is 1÷
0.7=1.4%.

The balance springs 27 and 28 are designed to balance the moisture-sensitive nylon ribbon 12 so as to provide a certain tension to stabilize its operation, taking into account the weight of the movable lever 17 and the expansion ratio for obtaining the above displacement amount. Set. Of course, these force relations mean that the contraction force of the moisture-sensitive nylon ribbon 12 is 12F,
When the tensions of the springs 27 and 28 are 27F and 28F, the following formula (12F>27F-28F) must be satisfied.

Next, the operation will be explained. It is assumed that the state shown in the figure is an atmosphere with a certain humidity, for example, 60% relative humidity (RH), and the reed switch 24 is in the on state. When the ambient atmospheric humidity increases in this state, the moisture-sensitive nylon ribbon 12 absorbs moisture and stretches, so the movable lever 17 is rotated clockwise in the drawing around the support pin 18 by the force of the spring 27.
Therefore, the magnet 2 at the tip of the movable lever 17
1 moves upward in the figure, and the reed switch 24 is turned off. Next, when the atmospheric humidity decreases, the moisture-sensitive nylon ribbon 12 contracts. Therefore, the movable lever 17 rotates counterclockwise in the drawing against the spring 27 due to the contraction force of the moisture-sensitive nylon ribbon 12, and moves the magnet 21 downward in the drawing.
Therefore, the reed switch 24 is turned on again.

Here, the middle part of the moisture-sensitive nylon ribbon 12 is
Since it is folded back into a V-shape by the roller pin 15 whose position is fixed, the lengthwise dimension, that is, the dimension from the connecting pin 19 to the roller pin 15, is the length of the moisture-sensitive nylon ribbon 12 stretched in a straight line. Or, even if it is spanned in a V-shape, the operating force can be reduced to approximately 1/2 compared to one in which the V-shaped folded part is movable to obtain a large operating force.
Also, if you increase the folded part and fold it back in a W shape,
It is also possible to reduce the length dimension to 1/4.

Next, we will explain the case of setting the relative humidity (RH) to 40%. Since relative humidity (RH) of 40% is lower than relative humidity (RH) of 60%, the moisture-sensitive nylon ribbon 12 contracts. Therefore, if the above settings are maintained, the contraction of the nylon ribbon 12 will cause the movable lever 17 to rotate counterclockwise, and the magnet 21 will be positioned further downward. Therefore,
When the relative humidity (RH) is 40%, the reed switch 24 does not turn on or off even if a predetermined humidity change occurs. In order to compensate for this, the adjustment pin 13 of the adjustment mechanism 14 is rotated and the adjustment pin 13 is rotated together with the holding body 13A.
is displaced to the left in the figure, and the magnet 21 is positioned at a predetermined height. For this reason, the reed switch 24
operates on and off with the same humidity change as in the case of 60% relative humidity (RH) of 40%.

Next, we will explain how to set the relative humidity (RH) to 90%. In this case, the relative humidity (R.
H) If left set at 60%, relative humidity (R.
H) At 90%, the magnet 21 is located at the upper position in the figure, so rotate the adjustment pin 13 of the adjustment mechanism 14 to move the adjustment pin 13 to the right in the figure together with the holder 13A, and move the magnet 21 to the predetermined position in the figure. Position at height. With this setting, the device will turn on and off with almost the same humidity changes as in the case described above, at a relative humidity (RH) of 90%.

As described above, the switch 24 is turned on and off by the expansion and contraction of the moisture-sensitive nylon ribbon 12 to output an electrical signal corresponding to changes in humidity. During this operation, the moisture-sensitive nylon ribbon 12 forms an endless loop. Since the entire structure is double-layered, the total length is doubled, and compared to the conventional single-layer structure, twice the force can be obtained at the same size.

When adjusting the set humidity, adjustment mechanism 1
Rotate the adjustment screw 14A of No. 4 and adjust the adjustment pin 13 at one end of the moisture-sensitive nylon ribbon 12 together with the holder 13A.
By displacing the humidity along the length of the moisture-sensitive nylon ribbon 12, it is possible to cope with a large change in the set humidity. At this time, moisture-sensitive nylon ribbon 1
The position change by the adjusting pin 13 at one end of the moisture-sensitive nylon ribbon 12 is in the longitudinal direction of the moisture-sensitive nylon ribbon 12, and the repulsion spring 1 is placed between the one end 11A of the case 11 and the holder 13A.
4B, the holding body 13A can be displaced without being affected by the backlash of the adjusting screw 14A, and its position relative to the case 11 can be ensured accurately.

In addition, since the moisture-sensitive nylon ribbon 12 has an endless loop shape and is double layered, when setting the moisture-sensitive nylon ribbon 12, insert the adjustment pin 13 into one end, and insert the adjustment pin 13 into the other end. Connecting pin 1
By inserting the roller pin 9, both ends are hooked with pins, and the middle portion is hooked on the outer periphery of the roller pin 15, so that the roller pin 15 can be easily attached while being connected to the adjustment mechanism 14.

[Effect of idea]

According to the present invention, the moisture-sensitive nylon ribbon has an endless loop shape and is double-layered as a whole, so the overall length is doubled, and compared to the conventional single-layer ribbon, the moisture-sensitive nylon ribbon has the same dimensions. Get twice the power,
The overall length and width can be reduced, allowing for miniaturization.

In addition, when adjusting the set humidity, turn the adjustment screw of the adjustment mechanism and displace the adjustment pin at one end of the humidity-sensitive nylon ribbon along the length direction of the humidity-sensitive nylon ribbon together with the holder. It is possible to easily adjust the humidity over a wide range of humidity.In this case, the adjustment pin at one end of the moisture-sensitive nylon ribbon is used to change the position along the length of the moisture-sensitive nylon ribbon. Since a repulsion spring is interposed between one end and the holder, the holder can be displaced without being affected by the buckling of the adjustment screw, and its position relative to the case is also ensured accurately. can be adjusted with high precision.

Also, since the moisture-sensitive nylon ribbon is double layered in an endless loop, when setting this moisture-sensitive nylon ribbon, insert an adjustment pin into one end and a connecting pin into the other end. By inserting it, both ends are pinned, and the middle part is hooked around the outer periphery of the roller pin, so that it can be easily attached while being connected to the adjustment mechanism, and assembly can be easily performed.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of the humidity detector according to the present invention. 11... Case, 11A... One end of the case,
12... Moisture-sensitive nylon ribbon, 13... Adjustment pin, 13A... Holder, 14... Adjustment mechanism, 14
A... Adjustment screw, 14B... Repulsion screw, 15...
Roller pin, 17...Movable lever, 17A...Short side part, 17B...Long side part, 19...Connecting pin, 2
1...Switch operating body, 24...Switch.

Claims (1)

[Claims for Utility Model Registration] It has a loop shape and is double-formed over its entire length, one end of which is hung on an adjustment pin, the other end is hung on a connecting pin, and the middle part is connected to the adjustment pin and the other end. a moisture-sensitive nylon ribbon folded back around the outer periphery of at least one roller pin provided in the case at a distance from the connecting pin; an adjustment mechanism provided for the adjustment pin at one end of the moisture-sensitive nylon ribbon; It is approximately L-shaped, and the connecting pin at the other end of the moisture-sensitive nylon ribbon is attached to the short side of the lever, and a movable lever with a switch operating body attached to the tip of the long side, and a movable lever for moving the switch operating body. a switch that operates on and off in accordance with a repulsion spring is interposed between one end of the case and the holding body,
A humidity detector characterized in that the adjustment pin is supported so as to be movable along the length of the moisture-sensitive nylon ribbon.