JPS6133570Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a temperature/humidity sensing device that forms the detection section of an electric temperature/hygrometer that simultaneously measures humidity and temperature at the same measurement location.

Dry/wet bulb type hygrometers, which have been widely used industrially, use a sensing method to indirectly determine humidity based on the difference in temperature indicated by dry and wet bulb thermometers. Since hygrometers are structurally equipped with a rod-shaped thermometer and an evaporative water container, (a) they require a large space for installation and reading, and (b) they are inconvenient to move, making them difficult to use in practice. (c) cannot be used in narrow horizontal spaces;
(d) It is troublesome to replenish evaporated water and replace the absorbent cloth; (e) it restricts use in environments where water is averse; and (f) remote measurement is not possible. Moreover, it has many drawbacks, such as the fact that the humidity cannot be read just by looking at it.

On the other hand, as an alternative sensing method, an electric hygrometer is known, which uses a moisture-absorbing object exposed to the measurement atmosphere as a humidity-sensing element and detects humidity by its capacitance. When using the sensing method, it is difficult to manufacture a large number of elements that have a constant capacitance under constant humidity, and as a result, the sensors are not compatible and the entire sensor must be replaced at the time of maintenance. The first thing is not to
There is a problem with this.

Conventionally, when measuring the amount of moisture in the air using the above-mentioned electric hygrometer, in parallel with measuring the humidity at the measurement location, the temperature at the measurement location is also measured. The amount of moisture was calculated based on the measured hygrometer and temperature values, but in this case, the position where the humidity sensing element was placed and the temperature measurement position were a little far apart, so the temperature in the measurement air area was In an environment where there is a distribution, there is a temperature difference between the temperature of the air in contact with the humidity sensing element and the measured temperature, causing the second problem that it is difficult to accurately measure the moisture content.

The present invention was devised to solve both of the above problems.In other words, the purpose of the present invention is to provide compatibility to the moisture-sensitive sensor part, and to provide a moisture-sensitive sensor in close proximity to the humidity-sensitive element of the sensor. An object of the present invention is to provide a temperature/humidity sensing device in which a sensor is arranged.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in FIGS. 1 to 6, the sensing device of the embodiment is a temperature sensing device assembled in a probe shape, and includes a support socket 1 and a ring part arranged on the axis of the probe. It is formed by a combination of a ring 2, a time constant output device 3, a ring packing 4, a humidity sensor unit 5, and a breathable cover 6, and the formation mode of each unit will be described below.

(a) Support socket 1 A cylindrical body forming the base of the probe, with a circumferential step 1a formed in the middle of its inner hole, and its base end becoming an externally threaded mounting screw 1b. ing.

A captire conductor 7 leading to an external measuring device (not shown) passes through the center of the base end, and the socket 1 is fixed to a partition wall 9 by a mounting nut 8.

(b) Ring packing 2 Fitted into the stepped portion 1a of the socket 1, and serves to seal the joint with the time constant output device 3.

(c) Time constant output device 3 Insulating cylindrical body 1 with partition wall 10a in the middle
The base half of a round bar-shaped electric temperature-sensing element 11 (measuring resistor) is fixed with a nut 12 into the core hole of a boss 10b which has a structural body 0 and protrudes from the center of the partition wall 10a. and the partition wall 10a
Three snap-type connector sockets 13 (of which only one is shown) are installed at three locations around the socket.

In addition, a threaded ring 14 having an external thread is fitted and fixed on the outer peripheral surface of the cylindrical body 10.
A printed board 15 is spread on the end surface of the cylindrical body 10 on the base side.

However, on the printed board 15, there is an oscillator 16.
In addition to mounting and forming electrical members such as and circuits thereof, the connector sockets 13 described above are electrically connected to the circuits.

A large number of lug terminals 17 are protruded from the outer surface of the printed board 15, and the oscillation output circuit of the printed board 15 and the output circuit of the temperature sensing element 11 are connected to the captire via each lug terminal 17. It is connected to the conductor 7.

In addition, a packing 4 is fitted to the inner peripheral edge of the open end surface of the cylindrical body 10.

(d) Ring packing 4 This packing 4 has the function of sealing the joint between the cylindrical body 10 and the sensor unit 5, and also has the same ring on the periphery facing the three connector sockets 13. Hole 4a through which socket 13 passes
is opened.

(e) Humidity sensor unit 5 This sensor unit 5 consists of a breathable cylinder container 18 which is sintered into a cylindrical shape, and a similar breathable protective cap 1 which covers the opening at the end of the container 18.
9, an insulating ring holder 20 fitted inside the half of the cap 19 of the container 18, and the holder 2.
0 and the cap 19, and an insulating ring 21 which is fitted inside the output device 3 of the same container 18 and assembled into an H-shaped cross section. It is formed of a circuit board 22, a partition plate 23, and a spacing cylinder 24, and three connector pins 2 are provided at three locations on the periphery of the circuit board 22 at positions facing the connector sockets 13.
5, 26, 27 (in Figure 3, only pin 25 is shown), each pin 25, 26, 27
The narrow diameter portion passes through the partition plate 23.

Note that the ring holder 20 and the circuit board 22 are fastened together with a coupling screw 28 to sandwich the circumferential portion of the cylinder container 18.

Furthermore, a pin hole communicating with the circuit board 22 passes through one location on the circumferential line of the ring holder 20, and a conductive pin 29 is embedded in the pin hole and is fastened with a snap. A short round rod-shaped conductive rubber seat 30 is press-fitted between the head of the pin 29 and the pin hole opening.

Further, a similar conductive rubber seat 31 is embedded in a position symmetrical to the rubber seat 30 of the presser ring 21, and a correction electrical resistor 32 is installed beside the partition plate 23 of the circuit board 22. At the same time as they are attached, the annular space between the circuit board 22 and the partition plate 23 is solidified with a molding material 33.

Here, the moisture sensing element 34 interposed between the ring holder 20 and the presser ring 21 will be explained.

A polymer film having a thickness of about 10 μm is used as a moisture absorbing material for this element 34, and a resin film of this thickness has appropriate moisture absorption properties.

Specifically, the circular resin film 35
A thickness of 100 Å is applied to the exposed part of the center inner circle on each side of the
Au film electrodes 36, 37 are deposited on the electrodes 36, 37, and at symmetrical locations of the electrodes 36, 37, for example, T-shaped terminal portions 36a, 37a, on which a thick Au film is deposited, protrude. is formed, and the element 34 is connected to each terminal portion 36.
a, 37a, each conductive rubber seat 31, 3
It is sandwiched in a state where it is in pressure contact with 0.

Next, on the circuit board 22, a time-determined element circuit (sixth
In other words, a parallel circuit of capacitance C and electric resistance R is formed, and between the connector pin 25 and the common connector pin 27, there are rubber seats 30, 3.
1. The capacitance C between the electrodes 36 and 37 is introduced through the conduction pin 29, the cap 19, the cylinder body 18, and the circuit board 22, and a resistor is connected between the connector pin 26 and the common connector pin 27. 32
A resistance R is introduced.

With such a circuit configuration, the oscillation circuit of the time constant output device 3 is connected to the oscillation circuit via the connector socket 13.
C and R as time-determining elements are electrically inserted.

(f) Air permeable cover 6 This cover is sintered in the shape of a pot, and has a mounting screw 6a cut on the inner edge of the opening, and this screw 6a is screwed into the threaded ring 14 of the output device 3.

Note that multiple types of equally shaped covers with different ventilation characteristics are prepared and attached to this cover 6, and when assembling the cover 6, the cover corresponding to the required sensitivity response can be selectively used. be done.

Finally, for the resistor 32 assembled in the humidity sensor unit 5, a resistor element having a different resistance value is used for each unit, that is, the resistance value of the resistor 32 of each unit 5 is is combined with the capacitance characteristic value of each humidity sensitive element 34 to select a resistance value that forms a circuit with a predetermined time constant in the oscillation circuit of the time constant output device 3.

Next, the operation of the sensing device according to the embodiment in which the above-mentioned members are coupled as shown in FIG. 2 will be explained.

Since the breathable cover 6, the cylinder container 18, and the cap 19 all have breathability through the pores created during sintering, the space in which the moisture-sensitive element 34 and the temperature-sensitive element 11 are housed is , the temperature and humidity of the outside air are the same, and therefore the film 35 of the humidity sensing element 34
absorbs moisture corresponding to the humidity of the outside air, and as a result, the time constant output device 3 outputs a vibration signal with a frequency that is correctly correlated to the humidity of the outside air.

Furthermore, an external measuring device (not shown) connected to the conductor 7 measures the frequency of the vibration signal;
Since the resistance value of the temperature sensing element 11 is measured, the sensed humidity value and temperature value can be correctly read by the measuring device.

By the way, if the sensing device of the embodiment is used for a long period of time, the moisture absorption performance of the film 35 of the humidity sensing element 34 will fluctuate or deteriorate, which will cause an error in the measured value. , cover 6
It is only necessary to remove the sensor unit 5, then pull out the sensor unit 5 and replace it with a new one.This operation is extremely simple, and since the cost of the sensor unit 5 is low, maintenance of the device does not require much cost.

Furthermore, the temperature value read by the above-mentioned measuring device can be widely used for purposes other than calculating the moisture content. Since the moisture sensitive element 34 is located in the same position, the correct temperature of the moisture sensitive element 34 is known and therefore the moisture content can be detected reliably.

By the way, the device of the embodiment can be fixedly attached to a wall surface as shown in FIG. 1, and can also be assembled into a hand-held probe as shown in FIG. 9. In this case, The tip of a long cylindrical grip 38 may be screwed onto the mounting screw 1a of the support socket 1, and then the conducting wire 7 may be passed through it.

As described above, according to the temperature/humidity sensing device according to the present invention, a unitized capacitive humidity sensing element and a humidity sensing element are provided in the breathable container formed near the tip of the device. The device consists of an electric temperature-sensing element placed close to the sensor, so if the humidity-sensing element deteriorates, all you have to do is replace the humidity sensor unit. This has the effect of increasing the reliability of the temperature/humidity sensing device, such as being able to accurately detect the temperature of the humidity element, and simplifying maintenance of the device.

[Brief explanation of drawings]

FIG. 1 is a front view of a temperature/humidity sensing device showing an embodiment of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is an exploded view of FIG. 2, and FIG. 3 is a partial enlarged view of the humidity sensing element, FIG. 5 is a plan view of the same element, FIG. 6 is a circuit diagram of the time-determining element circuit, and FIG. 7 is a diagram of the installation mode of the embodiment device. . 5...Sensor unit, 11...Temperature sensing element, 18...Cylinder container, 34...Moisture sensing element.

Claims (1)

[Scope of utility model registration request] The humidity sensor unit 5 is provided with a humidity sensor unit 5 and a time constant output device 3 which are removably joined with their opposing surfaces in contact with each other, and the humidity sensor unit 5 has a A container 18 to be formed, a moisture sensing element 34 which is an element housed in the container 18 and has a pair of coated electrodes 36 and 37 adhered to both surfaces of a polymer film 35, and both of the above. Film electrode 36,3
a correction electric resistor 32 that is combined with the capacitance characteristic values between 7 and 7 to form a circuit with a predetermined time constant;
A connector 25 for connecting the circuit to the time constant output device 3 is assembled into a unit, and the time constant output device 3 is connected to the humidity sensor unit 5 at a position where it is connected to the humidity sensor unit 5. , an electric temperature sensing element 11 whose tip is inserted through an opening formed on the opposite surface of the humidity sensor unit;
and a connector 13 which is detachably connected to the humidity sensor unit side connector 25 and is assembled into a unit.