JP3013068B2 - Temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor for measuring a temperature by bringing a contact surface of a thermocouple exposed from a casing into contact with a surface of an object to be measured. It relates to something that can be easily replaced when done.

[0002]

2. Description of the Related Art A conventional temperature sensor is disclosed, for example, in Japanese Utility Model Laid-Open Publication No. 3-83829. This is a thermocouple consisting of a contact surface pressed against an object to be measured and a thermocouple wire extended from both ends of the contact surface, and a heat insulating member in which the contact surface is located on the upper surface and the thermocouple wire is located on the side surface. The thermocouple and the signal processing circuit are connected by soldering the extension end of the thermocouple wire to the signal processing circuit, and the contact surface of the thermocouple is exposed to The processing circuit is housed in a case.

[0003]

The temperature sensor of this type has a structure in which the temperature is measured by directly contacting the contact surface with the surface of the object to be measured, so that the thermocouple is easily damaged. In the case of the above, when the damaged thermocouple is replaced, the thermocouple wire and the signal processing circuit must be re-soldered, so that there is a problem that it takes time and effort.

Accordingly, it is an object of the present invention to provide a temperature sensor that can easily replace a thermocouple.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is a contact surface pressed against an object to be measured and a thermoelectric element extended from both ends of the contact surface. A thermocouple consisting of a thermocouple consisting of a pair of wires, and a heat measuring unit comprising a heat insulating member in which the contact surface is located on the upper surface and the thermocouple wire is located on the side, and the temperature measuring unit is exposed by exposing the contact surface. accommodating to Ke - Sing and,該Ke - a thermocouple junction coupled to the signal processing circuit and the signal processing circuit contained within the single, sintered wire them together brought presses the thermocouple contacts said thermocouple wire And the temperature measuring unit is
And a screw member fixed to the shing.

[0006]

The operation of the above technical means is as follows.
The thermocouple contact of the signal processing circuit is pressed into contact with the thermocouple wire with a screw member , and the thermocouple wire is connected to the signal processing circuit. -Can be attached to and detached from the shingle, making it easy to replace damaged thermocouples.

[0007]

An embodiment showing a specific example of the present invention will be described (see FIG. 1). In this embodiment, a temperature sensor according to the present invention is combined with a vibration sensor.

A vibration transmitting plate 2 having a female thread is screw-coupled to a vibration detecting needle 1 having a small external thread formed on the lower portion, and the upper surface of the vibration transmitting plate 2 is in contact with the lower surface of the large diameter portion.
An upper electrode plate 3, a piezoelectric element 4, a lower electrode plate 5, and a weight 6 are sequentially inserted below the vibration transmission plate 2, are brought into contact with each other by a nut 7, and are fixed to the vibration detection needle 1. The vibration detecting needle 1 and the vibration transmitting plate 2 are formed of stainless steel, the upper and lower electrode plates 3 and 5 are formed of phosphor bronze, and the weight 6 is formed of zirconia ceramic. The vibration detecting needle 1, the vibration transmitting plate 2, the upper electrode plate 3, the piezoelectric element 4, the electrode plate 5, and the weight 6 form a vibration detecting unit of a vibration sensor.

The vibration detecting unit has an upper wall provided with a cut in the upper surface of the vibration transmitting plate 2 and a lower surface of the weight 6 on the side facing the front, and a fork extending downward further from the end on the side facing the upper wall. The upper surface of the vibration transmission plate 2 is brought into contact with the lower surface of the upper wall of the switch metal 9 by being sandwiched and held by the switch metal 9 composed of ing. The switch fitting 9 has two side walls extending downward from the upper wall, and the side wall and the upper wall are held by the inner wall of the casing 10 so that the vibration detecting unit can be mounted on the casing. 1
0 is attached.

The casing 10 is formed of two casing members, one on the side facing the paper and the other on the front side, and the taper screw 1 is formed.
1, 12 are connected. The switch fitting 9 is made of stainless steel, and the casing 10 is made of PEEK. Conductors (not shown) from the upper and lower electrode plates 3 and 5 are connected to terminals 14 and 15 of the signal processing circuit 13.

The thermocouple wires 16a and 16b, which are composed of long thin plates of chromel and alumel, are bent inward at the upper ends thereof, and extend downward in the shape of a disk having holes in the center of the upper and lower portions of the bent portion. A contact plate 17 having two legs and a disk-shaped protection plate 18 having a hole in the center are fixed by welding. A thermocouple is formed from the thermocouple wires 16a and 16b, the contact plate 17 and the protection plate 18.

The hollow cylindrical heat insulating tube 19 located inside the thermocouple comprises an upper small-diameter portion, a lower large-diameter portion, and a long middle diameter portion therebetween, with the upper end and the lower end remaining in the middle diameter portion. Thus, two windows 20a and 20b having the same width as the diameter of the hollow portion and communicating with each other through the hollow portion are formed on both sides, and both windows 20a and 20b are formed.
The upper left portion of b is cut vertically, and the lower left portions of both windows 20a and 20b are cut inward upward.

In the thermocouple, the protection plate 18 has a slight gap 21 between the lower surface thereof and the upper surface of the heat insulating tube 19, and the thermocouple wires 16a and 16b are formed inside the window from outside the small diameter portion of the heat insulating tube 19 and into the window. It is wound into the large-diameter hole from the outside of the large-diameter portion through the lower surface, and is fixed by the ring 22 pressed into the large-diameter hole. The portions of the thermocouple wires 16a and 16b located in the windows are elastically deformed portions 23a and 23b which are bent inward in advance, respectively.
When the contact plate 17 is pressed down,
It can be elastically deformed further inward as long as it does not come into contact with the inner vibration detection needle 1.

Outside the small diameter portion and the medium diameter portion of the heat insulating tube 19, a protective tube 2 having an inner diameter slightly larger than the outer diameter of the middle diameter portion.
4 has been inserted. The protection tube 24 is fitted to a projection 25 indicated by a dotted line formed at the lower end of the side surface of the middle diameter portion of the heat insulating tube 19 to prevent the protection tube 24 from being pulled out. The thermocouple, the heat insulating tube 19, the ring 22, and the protective tube 24 form a temperature measuring unit of a temperature sensor. Protection and contact plate 17 and the protective plate 18 tube 2 4
Is formed of stainless steel, the heat insulating tube 19 is formed of PEEK, and the ring 22 is formed of bakelite.
The thermocouple wires 16 a and 16 b are insulated from the portion facing the lower end of the foot of the contact plate 17 to the portion facing the upper part of the large diameter portion of the heat insulating tube 19.

A temperature measuring unit is passed through the vibration detecting needle 1 and inserted through an upper end opening of the casing 10. The thermocouple wires 16a and 16b located outside the large diameter portion of the heat insulating pipe 19 are connected to thermocouple contacts 28 and 29 connected to the terminals 26 and 27 of the signal processing circuit 13, respectively. Taper
Upper and lower cuts are provided around the screw holes of the casing 10 corresponding to the screws 11 and 12, respectively.
The inner portions 30, 31 of the respective splits are inwardly deformed by the screwing of the first and the second. As a result, the thermocouple wires 16a, 16b and the thermocouple contacts 28, 29 are firmly pressed against each other, and the temperature measuring unit 1
Fixed to 0. Te - Pa - screws 11 and 12 constitute a screw member, the Te - Pa - by loosening the screws 11 and 12, the temperature measuring unit Ke - can be pulled out from the single 10.

When measuring the operating state of an object to be measured,
Holding the casing 10 by hand, the tip of the vibration detecting needle 1 is pressed against the surface of the object to be measured, and is pushed down to the upper surface of the contact plate 17 of the thermocouple against the elastic force of the spring portion of the switch fitting 9. Thereby, the contact plate 17 of the thermocouple is also pressed against the object to be measured. Further, the elastic deformation portions 23a and 23b of the thermocouple wires 16a and 16b are deformed inward, and the tip of the vibration detecting needle 1 and the upper surface of the contact plate 17 are pushed to the upper surface of the protection tube 24.

The mechanical vibration of the object to be measured is detected by the vibration detecting needle 1.
Through the vibration transmitting plate 2 and acts on the piezoelectric element 4 as pressure fluctuation. In response, a voltage change occurs in the piezoelectric element 4. The voltage fluctuation is sent from the electrode plates 3 and 5 to the terminals 14 and 15 of the signal processing circuit 13 via the conductors, amplified and detected by the signal processing circuit 13 and calculated into an average value, a peak value, and the like. Are displayed on a display unit (not shown). On the other hand, the temperature signal of the object to be measured is detected by the thermocouple wires 16a and 16b via the contact plate 17, and the thermocouple contacts 28 and
The signal is sent to the terminals 26 and 27 of the signal processing circuit 13 via the line 29, amplified and displayed on the display unit.

[0018]

The present invention has the following specific effects. As described above, according to the present invention, the temperature measuring unit can be easily removed from the casing by releasing the pressure contact between the thermocouple wire and the thermocouple contact pressed by the screw member . Exchange of pairs becomes easy.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vibration sensor with a temperature sensor in which a temperature sensor according to an embodiment of the present invention is combined with a vibration sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Casing 11, 12 Tapered screw 13 Signal processing circuit 16a, 16b Thermocouple wire 17 Contact plate 19 Insulated tube 26, 27 Terminal 28, 29 Thermocouple contact

Claims (1)

(57) [Claims] 1. A thermocouple comprising a contact surface pressed against an object to be measured and thermocouple wires extended from both ends of the contact surface; and the contact surface is located on an upper surface and the thermocouple wire is located on a side surface. A temperature measuring unit comprising a heat insulating member located therein, and a case for exposing the contact surface and accommodating the temperature measuring unit therein.
A signal processing circuit housed in the casing, a thermocouple contact connected to the signal processing circuit, and a thermocouple contact pressed against the thermocouple wire to connect the two and to measure the temperature. Screw for fixing the unit to the casing
And a material .