JP2019158596A - Temperature detection sensor and temperature measurement device - Google Patents

Abstract

To achieve a novel temperature detection sensor.SOLUTION: A temperature detection sensor 10 has: a temperature detection element; a holding member; and a case. The temperature detection element 11 has: an element main body part 110; a plurality of lead wiring 111 nd 112 that are connected to the element main body; and an encapsulation part 113 that is made of a thermal conductivity encapsulation material encapsulating the element main body part. The holding member 12 is low in thermal conductivity, and is configured to hold the temperature detection element 11. The case 13 is configured to hold the temperature detection element inside the case via the holding member, and has an encapsulation part-purpose opening: and an opening for drawing of the lead wiring. The holding member is fixedly provided with the holding member fitted to an interior side of the case 13 so that the lead wiring of the held temperature detection element is drawn from the opening for drawing of the lead wiring and at least one part of the encapsulation part 113 is exposed from the holding member 12 on an encapsulation part-purpose opening side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a temperature detection sensor and a temperature measurement device.

  Temperature measurement is indispensable in various industrial fields, and various types of “temperature detection sensors” that are sensors for temperature measurement have been known. Patent Document 1 discloses a device that can be installed in a liquid such as water or a solution or in an atmosphere of corrosive gas.

  An object of the present invention is to realize a novel temperature detection sensor.

  The temperature detection sensor according to the present invention is a temperature detection sensor having a temperature detection element, a holding member, and a case. The temperature detection element includes an element main body and a plurality of lead wires connected to the element main body. A sealing portion made of a heat conductive sealing material that seals the element main body, the holding member has low thermal conductivity, holds the temperature detection element, and the case includes the holding member. The temperature detection element is held inside the case via an opening, and has an opening for the sealing portion and an opening for drawing out the lead wire, and the holding member holds the lead of the temperature detection element held The wire is pulled out from the opening for drawing, and is fitted and fixed inside the case so that at least a part of the sealing portion is exposed from the holding member to the opening side for the sealing portion. Is provided.

  According to the present invention, a novel temperature detection sensor can be realized.

It is a figure for demonstrating one example of embodiment of a temperature detection sensor. It is a figure for demonstrating the pressure to the holding member 12 of a temperature detection sensor. It is a figure explaining four examples of the cross-sectional shape of the case of a temperature detection sensor. It is a figure for demonstrating another example of embodiment of a temperature detection sensor. It is a figure for demonstrating the other example of embodiment of a temperature detection sensor. It is a figure for demonstrating the other example of the attachment to the flow-path part of the temperature detection sensor shown to Fig.5 (a). It is a figure for demonstrating the further another example of embodiment of a temperature detection sensor. It is a figure for demonstrating another example of embodiment of a temperature detection sensor. It is a figure for demonstrating the specific example of a temperature detection sensor. It is a figure which shows notionally 1 example of implementation of a temperature measuring apparatus.

Hereinafter, embodiments will be described.
FIG. 1 is an example of an embodiment of the temperature detection sensor of the present invention.
As illustrated, the temperature detection sensor 10 includes a temperature detection element 11, a holding member 12, and a case 13.
The temperature detection element 11 includes an element main body 110, two lead wires 111 and 112, and a sealing portion 113.
The lead wires 111 and 112 are connected to the element main body 110. In this embodiment, there are two lead wires, but the present invention is not limited to this and may have three or more lead wires. The lead wire can also be coated.
As the element main body 110, various known thermal sensors such as a thermocouple and thermistor can be used, and there is no particular limitation as long as “electric characteristics change according to temperature change”. be able to.

The sealing portion 113 is a portion where the element main body 110 is sealed with a “sealing material”.
The sealing portion 113 is for directly touching a detection target (gas such as liquid or vapor) that is a target of temperature detection and transferring heat of the detection target to the element main body 110. Therefore, the sealing material forming the sealing portion 113 needs to be a “heat conductive material”.
When the size of the sealing portion 113 is increased, the heat transfer time from the detection target body to the element main body becomes longer. In addition, when the thermal conductivity of the sealing material is low, the heat transfer efficiency from the detection object to the element body 110 becomes low.
In order to realize a “responsive sensor” as the temperature detection sensor, it is preferable to use a sealing material having as high a thermal conductivity as possible and to form the sealing portion 113 with a small size. By reducing the size of the sealing portion 113 and bringing the detected body in contact with the sealing portion 113 close to the element main body 110, the heat transfer time to the element main body 110 by the sealing portion 113 can be shortened. If the thickness of the sealing material between the surface of the sealing portion and the element main body becomes too thin, the mechanical strength of the sealing portion 113 is weakened, so that “necessary mechanical strength as a temperature detection sensor” is ensured. In addition, the size of the sealing material and the sealing portion 113 is set.

The holding member 12 is a low heat transfer material and holds the temperature detection element 11.
The case 13 holds the temperature detection element 11 inside the case via the holding member 12.
The case 13 has an opening for a sealing portion and “an opening for drawing out the lead wires 111 and 112”.
The temperature detection element 11 is held by the holding member 12 as shown in the figure. That is, the held lead wires 111 and 112 of the temperature detecting element 11 are drawn out from the “drawing opening (upper opening in the drawing)” of the case 13, and at least a part of the sealing portion 113 is “sealed”. It is exposed from the opening side for the stop (opening in the lower part of the figure).

The holding member 12 that holds the temperature detecting element 11 as described above is fixedly provided inside the case 13.
The holding member 12 may be fixed to the case 13 by, for example, fixing it to the inner peripheral portion of the case 13 with an adhesive or the like. However, the holding member 12 is not limited to this, and the holding member is configured by an “elastic body” and is compressed in the case. 13 may be inserted into the inside of the case 13, pressed against the inside of the case 13 by the elastic force of the holding member 12, and fixed by the frictional force.

In the embodiment shown in FIG. 1, a holding member 12 made of an elastic body is assumed. The holding member 12 is pressed against the inner peripheral surface of the case 13 by its elastic force, and is fixed to the case 13 by a frictional force. It is supposed to be retained.
When the temperature detection sensor as shown in FIG. 1 is put into use, the sealing portion 113 is located on the side of the detected object (not shown, but below the holding member 12 in FIG. 1) from the holding member 12. And the surface of the holding member 12 exposing the sealing portion 113 is exposed to the object to be detected. In this case, if the object to be detected has “a certain degree of pressure”, it acts as an external pressure on the surface of the holding member 12 exposing the sealing portion 113.

  FIG. 2 shows this state. When the pressure of the object to be detected (indicated by an arrow directed to the lower surface of the holding member 12) acts on the holding member 12 as shown in the figure, the surface exposing the sealing portion 113 is formed as a concave surface as shown in the figure. The holding member 12 is elastically deformed, and an upward pressure in the figure acts on the holding member 12. The pressure acts to compress the holding member 12, and the elastic force (indicated by an arrow) acting on the inner wall of the case 13 of the holding member 12 also increases.

  Assuming that the “opening of the lead wires 111 and 112 on the side where the lead wires 111 and 112 are drawn out has a diameter larger than that of the opening on the sealing portion 113” of the case 13, it is retained when the pressure of the detection target is strong. A case where the member 12 is pushed out of the case 13 can be considered.

  In the embodiment of FIG. 1, in view of this point, the diameter of the opening on the side where the lead wires 111 and 112 are pulled out is smaller than the opening on the sealing portion 113 side of the case 13. The holding member 12 is prevented from coming out of the case 13 even when the pressure due to is applied. With the configuration of the present invention, durability can be improved.

  The configuration for preventing the holding member from coming out of the case is not limited to the configuration shown in FIG. 1, and various configurations are possible. FIG. 3 shows four examples of such a configuration. Of course, it is not limited to these structures.

In order to avoid complication, the holding member and the temperature detecting element are given the same reference numerals as in FIG. In these examples, the holding member 12 that holds the temperature detecting element 11 is assumed to be an “elastic body”.
In the case 13A of the temperature detection sensor 10A shown in FIG. 3A, the opening diameter on the sealing portion 113 side is increased by the step 13A1 formed in the vicinity of the opening on the sealing portion side of the temperature detection element 11.
The inner peripheral surface 13B1 of the case 13B of the temperature detection sensor 10B shown in FIG. 3B has a “taper” that narrows from the sealing portion 113 side toward the lead wire drawing side.
In the case 13C of the temperature detection sensor 10C shown in FIG. 3C, a concave groove 13C1 having a large inner diameter is formed between the opening on the sealing portion 113 side and the opening on the lead wire drawing side.
The inner peripheral surface 13D1 of the case 13D of the temperature detection sensor 10D shown in FIG. 3D has an inner diameter that changes in a wave shape from the opening on the sealing portion 113 side to the opening on the lead wire drawing side.
In both examples shown in FIGS. 1 and 3, the inner peripheral surface of the case has “a cross-sectional shape that prevents the holding member 12 from being displaced at least toward the lead wire opening”.
In the example shown in FIGS. 1 and 3A, the cases 13 and 13A have a cross-sectional shape in which the opening diameter of the lead wire drawing opening is smaller than the opening diameter of the opening for the sealing portion.

  In the example shown in FIGS. 1, 3A, and 3C, the cross-sectional shape of the inner peripheral surfaces of the cases 13, 13A, and 13C has “one or more steps”. There may be two or more steps.

As described above, the sealing portion 113 is “thermally conductive” and the holding member 12 is “low thermal conductive”. However, as described above, the sealing portion 113 is preferably highly thermal conductive.
Further, the holding member 12 has as low heat conductivity and high heat insulation as possible in order to avoid “the heat of the object to be detected escapes through the holding member” and the temperature of the holding member itself increasing. It is also preferable that the heat capacity is small.

Examples of the “sealing material having high thermal conductivity” preferably used for the sealing portion 113 include “ceramic, crystal, glass, etc.”, but are not limited thereto.
Moreover, as a material of the holding member 12, various rubber | gum (generally heat insulation is high) can be used. In this case, by using “foamed rubber” as the holding member, the heat insulation can be more effectively improved.
The object to be detected may be a liquid or a gas, but it is not limited to “neutral” but may be “acidic” or “alkaline” and contains various drugs. Sometimes. Therefore, it is preferable that the sealing portion and “the portion of the holding member and the case that come into contact with the detection target” are chemical resistant.
The ceramic, crystal, and glass exemplified above as the sealing material have high chemical resistance.

As the material of the holding member, for example, fluororubber and fluororesin have high chemical resistance, and various types of rubber are used depending on the type of the detection object such as “specimen” and “reagent contained in the detection object”. The material can be appropriately selected.
The case can be made of various metals and plastics, but if the case material does not have "chemical resistance", the part exposed to the object to be detected should be "chemically treated". it can. When the temperature of the object to be detected is high, all of the sealing material, the holding member, and the case are made of a heat resistant material.

In the temperature detection sensor described in the above embodiment, since the sealing portion 113 of the temperature detection element 11 is in direct contact with the detection target, the periphery of the sealing portion 113 is a “holding member made of a highly heat-insulating material”. By covering, heat conduction to parts other than the temperature detection element 11 can be suppressed, and it becomes possible to improve the responsiveness of temperature detection.
Further, by forming the portion that may come into contact with the object to be detected with a “chemically resistant material”, corrosion due to the specimen or reagent can be effectively prevented or reduced, and the temperature detection sensor can be extended in life.
Furthermore, the inner peripheral surface of the case has a cross-sectional shape that prevents the holding member from displacing at least toward the opening for drawing out the lead wire. Even when an external force such as water pressure or the like is applied, the holding member can be prevented from coming out to the lead wire opening side.
Further, by configuring the holding member with an elastic body, the holding member is compressed when the pressure from the detected body is applied to the holding member or the sealing portion as shown in FIG. It is possible to prevent the detected object from leaking to the outside.

FIG. 4 is a diagram for explaining another embodiment of the temperature detection sensor. In order to avoid complication, the same reference numerals as those in FIG.
In the temperature detection sensor 10E shown in FIG. 4A, the outer periphery of the case 13E is a cylindrical surface. Incidentally, the outer peripheral shape of the case in the temperature detection sensors 10 to 10E shown in FIGS. 1 to 3 may be a cylindrical surface, but is not limited thereto, and may be a columnar surface shape.
In the temperature detection sensor 10E shown in FIG. 4A, a groove 13E1 is formed circumferentially on the cylindrical outer peripheral surface of the case 13E, and an O-ring OL is fitted in the groove 13E1.
FIG. 4B illustrates an example in which the temperature detection sensor 10E illustrated in FIG. 4A is used in a temperature measurement device.
In the drawing, a portion denoted by reference numeral 200 is a flow path constituting portion constituting the “flow path of the detection target”, and a cylinder in which the temperature detection sensor 10E is fitted to the tube wall of the portion denoted by reference numeral 201 forming a part thereof. A hole is formed, and a temperature detection sensor 10E is fitted and fixed to this portion as shown in the figure. At this time, since the O-ring OL fitted “just” in the groove 13E1 closes the gap between the temperature detection sensor 13E and the flow path tube wall, the gas or liquid to be detected flowing in the flow path 203 leaks to the outside of the flow path. It can be prevented from coming out. That is, when the temperature detection sensor is incorporated into the flow path, the gap between the temperature detection sensor and the flow path can be closed without using an adhesive or the like.

  As shown in FIG. 4B, the O-ring OL is compressed and pressed against the fitting hole of the flow path by the elastic force to close the gap between them.

  In FIG. 5, another embodiment of a temperature detection sensor and the state which incorporated this in the flow path are shown in explanatory drawing. As shown in FIG. 5A, the temperature detection sensor 10F according to this embodiment has a screw portion 13F1 formed on the cylindrical peripheral surface of the case 13F, and the screw portion 13F1 is formed as shown in FIG. In addition, it is fixed to the flow path by screwing with a screw groove formed in “a hole wall formed in a portion indicated by reference numeral 201” of the flow path component 200.

Further, the end of the case 13F on the “lead wire drawing side” is formed in a flange, and the lower surface of the flange is in close contact with the outer wall surface of the flow path component.
When the temperature detection sensor 10F and the flow path component 200 are fixed by “screwing” as in this embodiment, a fixing means such as an adhesive is not required for fixing both of them.

However, since a “gap” is generated in the screwed portion by the screw, there is a possibility that the liquid or gaseous detected object may leak from there, so a seal tape is wound around the screwed portion or a gasket is provided, etc. The gap should be sealed.
When the temperature detection sensor is attached to the flow path component using a screw structure, an O-ring OL is provided between the flange portion of the temperature detection sensor 13F and the flow path component as shown in FIG. The inside and outside of the road may be sealed.

In the embodiment shown in FIGS. 4 to 6, the outer peripheral surface of the case of the temperature detection sensor is “cylindrical”, and this cylindrical outer peripheral surface has a “sensor mounting structure”.
The sensor mounting structure is a structure in which a temperature detection sensor is mounted on a flow path component.
In the temperature detection sensor 10E shown in FIG. 4, a groove 13E1 formed in a circular shape on the cylindrical outer peripheral surface of the case 13E and an O-ring OL fitted in the groove 13E1 are “sensor mounting structure”. .
In the temperature detection sensor 10F shown in FIG. 5, the screw part 13F1 formed on the outer periphery of the case 13F forms a “sensor mounting structure”. In the example shown in FIG. 6, the screw part 13F1 and the O-ring OL have a sensor mounting structure. There is no.
Note that the flow path component 200 in FIGS. 4 to 6 is composed of portions denoted by reference numerals 201 and 202.

FIG. 7 shows another embodiment of the temperature detection sensor.
In this embodiment, the temperature detection sensor 10G has the same configuration as the temperature detection sensor 10 shown in FIG. 1, and the same reference numerals as those in FIG. 1 are used for those that are not likely to be confused. . The temperature detection sensor 10 </ b> G has electrodes 11 </ b> A and 11 </ b> B to which lead wires 111 and 112 of temperature detection elements are connected, and these electrodes 11 </ b> A and 11 </ b> B are fixed to the holding member 12.
With such a configuration, disconnection of the lead wires 111 and 112 can be effectively prevented.

FIG. 8 is a diagram showing another embodiment of the temperature detection sensor. In order to avoid confusion, the same reference numerals as in FIG. 1 are used for those that are not likely to be confused.
In the temperature detection sensor 10H, a sealing portion 113A for sealing the element main body 110 of the temperature detection element is integrally provided on the tablet TB. In the temperature detection sensor shown in FIGS. 1 to 7, only a part of the sealing portion 113 is exposed from the holding member 12. However, in the configuration of FIG. 8, the entire sealing portion 113 </ b> A is exposed to detect the object to be detected. Since the contact area between the two increases, the responsiveness of temperature detection can be further improved.

Specific examples are given below.
Please refer to FIG. FIG. 9A is a diagram for explaining a specific example of the temperature detection sensor. The temperature detection sensor shown in the figure embodies the temperature detection sensor 10E described above with reference to FIG.
As the temperature detection element 11, an element body portion of a commercially available thermistor was used as a sealing portion 113 by “sealing in a substantially spherical shape with glass as a sealing material”. The diameter A of the sealing portion 113 shown in FIG.
The holding member 12 was formed using fluorine rubber having high heat insulating properties.
The case 13E was configured using “polypropylene” which is a low thermal conductive resin.
The height 13C in the vertical direction of the case 13E shown in FIG. 9A is 6 mm.
In the drawing of the case 13E, the diameter of the upper “narrower opening (circular shape)” is 2 mm, and the diameter of the lower “wider opening (circular shape)” is 3 mm.
As shown in the figure, the holding member 12 holding the temperature detecting element 11 was inserted into the case 13E in a compressed state, and fixedly provided in the case 13E by friction caused by the elastic force.
As described above with reference to FIG. 4B, the temperature detection sensor 10E configured in this way was fitted into the tube wall indicated by reference numeral 201 of the flow path component 200 and fixed by the O-ring OL.

The flow path component 200 is formed by forming a flow path having a circular cross section with polypropylene having high heat insulating properties. The inner diameter of the flow path is 1.5 mm.
“Water whose temperature was adjusted to 40 ° C.” was circulated through this channel. The external environmental temperature is 22 degrees. Distribution was continuous.

  When the temperature of the hot water was measured by the temperature detection sensor 10E, the detected temperature rapidly rose from the ambient temperature: 22 ° C and approached the liquid temperature: 40 ° C, and reached 39 ° C in about 6 seconds. Temperature: equal to 40 ° C.

  The temperature detection sensor 10E described above with a specific example has extremely high responsiveness to the temperature of the detected object. In the measurement described above, “water whose temperature is adjusted to 40 ° C.” that is the detection target is continuously circulated. However, the detection target may be intermittently distributed at one time. If, for example, the time for flowing is 100 seconds or more, accurate temperature measurement can be performed “within the circulation time during which the circulation continues”.

Further, as described above, the temperature detection sensor of the present invention can be configured extremely small.
FIG. 10 is a conceptual explanatory diagram showing one embodiment of the temperature measuring device of the present invention.
In the figure, reference numeral 10 denotes a temperature detection sensor, reference numeral 20 denotes a control calculation unit, reference numeral 30 denotes a power source, reference numeral 40 denotes a display, reference numeral 50 denotes a liquid storage unit, reference numeral 60 denotes a flow path, and reference numeral 70 denotes an on-off valve.

In this temperature measuring device, the liquid detection object stored in the liquid storage unit 50 is intermittently circulated through the flow path 60, and the liquid temperature is detected by the temperature detection sensor 10 provided in the flow path 60, and control is performed. The liquid temperature of the detection object obtained by the arithmetic processing by the arithmetic unit 60 is displayed on the display 40.
As shown in the figure, the control calculation unit 20 controls the temperature detection sensor 10 and also controls the open / close valve 70 to control the intermittent flow of the detected object.
As the temperature detection sensor, the temperature detection sensor of the present invention is used. For example, any of the temperature detection sensors 10 to 10G described above can be used.

As described above, according to the present invention, the following temperature detection sensor and temperature measurement device can be realized.
[1]
A temperature detection sensor having a temperature detection element, a holding member, and a case, wherein the temperature detection element (11) includes an element main body (110) and a plurality of lead wires (111, 112) connected to the element main body. ) And a sealing portion (113) made of a heat conductive sealing material for sealing the element main body, and the holding member (12) has low thermal conductivity, and the temperature detecting element (11) The case (13-13F) holds the temperature detection element inside the case via the holding member, and has an opening for the sealing portion and an opening for drawing out the lead wire. In the holding member (12), the lead wire of the held temperature detecting element is drawn out from the opening for drawing, and at least a part of the sealing portion (113) is used for the sealing portion. Exposed from the holding member to the opening side Sea urchin, wherein provided each other fit inwardly fixedly case, the temperature sensor (FIGS. 1-8).

[2]
It is a temperature detection sensor as described in [1], Comprising: The said sealing part (113) is high thermal conductivity, The said holding member (12) is a temperature detection sensor which is heat insulation.

[3]
The temperature detection sensor according to [1] or [2], wherein at least a portion of the sealing portion (113) and the holding member (12) and the case (13 to 13F) on the sealing portion side Temperature detection sensor that is chemical resistant.

[4]
The temperature detection sensor according to any one of [1] to [3], wherein the holding member (12) is an elastic body and is provided in the case in a contracted state.

[5]
The temperature detection sensor according to any one of [1] to [4], wherein the inner peripheral surface of the case is a cross-section that prevents the holding member from being displaced at least toward the drawing opening. A temperature detection sensor having a shape.

[6]
[5] The temperature detection sensor according to [5], wherein the case has the cross-sectional shape in which an opening diameter of the drawing opening is smaller than an opening diameter of the opening for the sealing portion (FIG. 1, FIG. 3 (a), FIG. 3 (b), etc.).

[7]
[6] The temperature detection sensor according to [6], wherein a cross-sectional shape of an inner peripheral surface of the case has one or more steps (FIGS. 1, 3A, 3C, and 4). etc).

[8]
The temperature detection sensor according to any one of [1] to [7], wherein the outer peripheral surface of the case has a cylindrical shape, and the sensor has a sensor mounting structure on the cylindrical outer peripheral surface (see FIG. 4 to 6 etc.).

[9]
The temperature detection sensor according to any one of [1] to [8], comprising electrodes (11A, 11B) to which a plurality of lead wires of the temperature detection element are connected, and the electrodes being the holding member And a temperature detection sensor (FIG. 7) fixed to at least one of the cases.

[10]
A temperature measuring device using the temperature detection sensor according to any one of [1] to [9] (FIG. 10).

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above, and the invention described in the claims unless otherwise specified in the above description. Various modifications and changes are possible within the scope of the above.
For example, although the case where a liquid is used as the detection object has been described above, as described above, the detection object is not limited to a liquid but may be a gas. As the liquid specimen, various liquid chemicals, biological "specimens (urine and blood)" and the like are possible.
In the above description, the temperature of the fluid flowing intermittently has been described. Of course, the temperature detection sensor of the present invention is also used for temperature measurement when the liquid or gas that is the detection target flows continuously. Can be used. Needless to say, the object to be detected can be used for measurement not only when it is flowing, but also when it is stationary.

  The effects described in the embodiments of the present invention are merely a list of suitable effects resulting from the invention, and the effects of the present invention are not limited to those described in the embodiments.

10 Temperature detection sensor
11 Temperature detection element
110 Element body
113 Sealing part
111, 112 Lead wire
12 Holding member
13 cases

JP-A-9-243468

Claims (10)

A temperature detection sensor having a temperature detection element, a holding member, and a case,
The temperature detection element has an element body, a plurality of lead wires connected to the element body, and a sealing portion made of a heat conductive sealing material that seals the element body.
The holding member has low thermal conductivity and holds the temperature detecting element,
The case holds the temperature detection element inside the case via the holding member, and has an opening for the sealing portion and an opening for drawing out the lead wire,
In the holding member, the lead wire of the held temperature detection element is pulled out from the opening for drawing, and at least a part of the sealing portion is exposed from the holding member to the opening side for the sealing portion. A temperature detection sensor that fits inside the case and is fixedly provided. The temperature detection sensor according to claim 1,
The temperature detecting sensor, wherein the sealing portion has high thermal conductivity and the holding member is heat insulating. The temperature detection sensor according to claim 1 or 2,
A temperature detection sensor in which at least the sealing portion side portion of the sealing portion and the holding member and the case is chemical resistant. The temperature detection sensor according to any one of claims 1 to 3,
The temperature detection sensor, wherein the holding member is an elastic body and is provided in the case in a contracted state. The temperature detection sensor according to any one of claims 1 to 4,
The temperature detection sensor, wherein the inner peripheral surface of the case has a cross-sectional shape that prevents the holding member from being displaced at least toward the side of the drawer opening. The temperature detection sensor according to claim 5,
The temperature detection sensor, wherein the case has the cross-sectional shape in which an opening diameter of the opening for drawing is smaller than an opening diameter of the opening for sealing portion. The temperature detection sensor according to claim 6,
The temperature detection sensor in which the cross-sectional shape of the inner peripheral surface of the case has one or more steps. The temperature detection sensor according to any one of claims 1 to 7,
A temperature detection sensor in which an outer peripheral surface of the case is cylindrical, and a sensor mounting structure is provided on the cylindrical outer peripheral surface. The temperature detection sensor according to any one of claims 1 to 8,
A temperature detection sensor having an electrode to which a plurality of lead wires of the temperature detection element are connected, and the electrode is fixed to at least one of the holding member and the case.   A temperature measuring device using the temperature detection sensor according to claim 1.

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