JPS63170121A - Tempearture detecting device - Google Patents

Abstract

PURPOSE:To promote the protection of a temperature detecting part and the improvement of sealing performance and work efficiency, by inserting a temperature detector through an O ring to a mounting seat, which is mounted to a part where a temperature is detected, and fixing a fixing member to the mounting seat from the upper of the temperature detector. CONSTITUTION:When a temperature detector 1 is mounted, after an O ring 18 is mounted being fitted to the periphery of a cylindrical part 3b of a metal case 3, the temperature detector 1 is inserted into a mounting seat 10 till a flange part 3c is adapted to a stepped part 10d. In this way, the metal case 3, which provides a builtin temperature sensor 2, discloses a bottom part 3d in the inside of a refrigerant pipe 20. While the O ring 18, which is compressed between the periphery of the cylindrical part 3b of the metal case 3 and the bottom part of an O ring groove 10c in the mounting seat 10, is housed in the O ring groove 10c. And a fixing member 15, which screws its external threaded part 15c to an internal threaded part 10e of the mounting seat 10 holding the flange part 3c of the metal case 3 between a pressing surface 15b of the fixing member 15 and the stepped part 10d of the mounting seat 10, fixes the temperature detector 1 to the mounting seat 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature detection device, and particularly to a temperature detection device suitable for detecting the refrigerant temperature of a refrigeration cycle.

[Conventional technology]

Conventionally, as a temperature detection device as mentioned above, Japanese Patent Application Laid-Open No. 61-6
The one shown in FIG. 5 of Japanese Patent No. 6065 is known.

According to this, a temperature sensor configured so that the electrode wire of the temperature sensor exposed inside the object to be measured is drawn out by applying a glass seal to the mounting body is attached to a container containing the object to be measured. It is screwed into a cylindrical mounting seat that communicates with the inside of the container via an O-ring. but.

No consideration was given to the insulation and surface protection of the temperature sensor and electrode wires, the sealing performance of the O-ring was not reliable enough, and the mounting dimensions were large.

[Problem that the invention seeks to solve]

The above conventional technology does not take into account the insulation and surface protection of the temperature sensor and electrode wire, resulting in deterioration of the temperature sensor and corrosion of the electrode wire due to poor insulation, deformation and disconnection due to external force applied during handling, and intrusion of moisture, etc. There were other problems. In addition, the O-ring installed between the mounting body and the mounting seat to prevent leakage of the measured object to the outside of the container rotates as the mounting body is screwed in and is pressed against the seat surface, gradually deforming elastically. However, there was a problem in that sufficient sealing performance could not be obtained due to the occurrence of kinks.

Furthermore, when attempting to attach or detach the temperature sensor with the electrode wires connected to an external circuit, the electrode wires may be twisted and broken due to rotation of the mounting body. Also, work efficiency was extremely poor.

An object of the present invention is to provide a temperature detection device that ensures reliable insulation and protection of the temperature sensor and electrode wires, has high reliability in the sealing performance of the O-ring, has good installation workability, and has small installation dimensions. It is in.

[Means for solving problems]

The above purpose is to provide a temperature sensor in which a temperature sensor to which electrode wires are connected is enclosed and fixed via an insulator in a bottomed cylindrical metal case having a flange on the outer periphery, and a stepped part that engages with the flange. A mounting seat that is connected to the inside of a container that has a cylindrical shape formed on the inner periphery and stores the object to be measured; A fixing member to be attached is provided, a temperature sensor is inserted into the mounting seat, and the collar of the metal case is held between the stepped part of the mounting seat and the engaging part of the fixing member. This is achieved by sandwiching an O-ring between the inner peripheral surface of the mounting seat.

[Effect]

The connection part of the temperature sensor and electrode wire is securely insulated and fixed in the metal case via an insulator, which prevents moisture from entering from the outside and prevents poor insulation, deterioration of the temperature sensor, or damage to the electrode wire. Can prevent corrosion. Furthermore, since they are protected by a metal case, the temperature sensor and electrode wires will not be damaged by external forces applied during handling.

Furthermore, the O-ring is elastically deformed to be compressed between the outer circumferential surface of the metal case and the inner circumferential surface of the mounting seat, and the collar portion of the metal case is pressed between the engaging portion of the fixing member and the stepped portion of the mounting seat. Since it is clamped and fixed, the O-ring does not twist, and highly reliable sealing performance can be obtained.

Furthermore, since the temperature sensor can be attached to the mounting seat without directly rotating it, the temperature sensor can be attached and detached without twisting the electrode wire even when the electrode wire is connected to an external circuit.

〔Example〕

Hereinafter, one embodiment of the present invention will be described using a cross-sectional view of an attached state shown in FIG. 1 and a perspective view shown in FIG. 2.

The temperature sensor 1 includes a temperature sensor 2 made of, for example, a thermistor, and a cylindrical portion 3a made of a copper plate with good thermal conductivity.

) It is housed inside a metal case 3 formed into a bottomed cylindrical shape having a flange 3c approximately in the center of the ab, and is constructed by injection molding an insulating part 5. Here, before the temperature sensor 2 is housed in the metal case 3, an electrode wire 4 for extracting a detection signal to the outside is connected to the temperature sensor 2.

The connecting portion of the electrode wire 4 and the outer surface of the temperature sensor 2 are coated with an insulating coating 6, and the portion other than the connecting portion of the electrode wire 4 is covered with a covering tube 4a and led out to the outside of the metal case 3. There is.

On the other hand, reference numeral 10 designates a stepped cylindrical mounting seat which is attached to the refrigerant pipe 20 as a container by brazing or the like, into which the refrigerant pipe 20 of the refrigeration cycle flows, and exposes the temperature sensor 1 inside the refrigerant pipe 20. a through hole 10a for the metal case 3, a guide portion 10b that fits into the cylindrical portion 3b of the metal case 3, and an O-ring groove 1 for fixing the O-ring 18 between the outer periphery of the cylindrical portion 3b. Oc.

Step portion 1 that receives the collar portion 3c of the metal case 3 in the axial direction
0d and a female threaded portion 10e for screwing in the fixing member 15.
A cylindrical portion 10f having an inner periphery thereof is sequentially formed. Here, the fixing member 15 is for fixing the temperature sensor 1 to the mounting seat 10, and has a through hole 15a through which the electrode s4 of the temperature detection i1 is passed.

It includes a pressing surface 15b as an engaging part for pressing the flange 3c of the metal case 3, a male threaded part 15c screwed into the female threaded part 10e' of the mounting seat 10, and a spanner hook part 15d for hanging a spanner. There is. Further, the O-ring 18 is used to prevent the refrigerant in the refrigerant pipe from leaking to the outside, and is made of an elastic material such as rubber.

Next, a method for attaching the temperature detection device of this embodiment made of the above-mentioned components will be described.

First, the cylindrical part 3b below the collar part 3c of the metal case 3
After fitting the O-ring 18 to the outer periphery of the temperature sensor 1,
is inserted into the mounting seat 10 until the collar 3c contacts the step 10d. As a result, the bottom portion 3d of the metal case 3 in which the temperature sensor 2 is installed is exposed inside the refrigerant pipe 20 so as to directly exchange heat with the refrigerant, and the O-ring 18
is compressed between the outer periphery of the cylindrical portion 3b of the metal case 3 and the bottom of the O-ring groove 10c of the mounting seat 10, and is stored in the O-ring groove 10c in an elastically deformed state.

Thereafter, the male threaded portion 15e of the fixing member 15 is screwed into the female threaded portion 10e of the mounting seat 10, and the pressing surface 15 of the fixing member 15 is
By sandwiching the collar portion 3c of the metal case 3 between the stepped portion of the mounting seat 10 and the step portion]Od of the mounting seat 10, the temperature sensor 1 is fixed to the mounting seat 10 and the mounting is completed.

Next, other embodiments shown in FIGS. 3 and 4 will be described.

Note that the configuration of the temperature detector 1 itself is exactly the same as that in the previous embodiment, so a description thereof will be omitted.

First, the mounting seat 10 has a through hole 10a similar to the above-mentioned embodiment.
, a guide portion 10b, an O-ring groove 10c, a stepped portion 10d, and a cylindrical portion 10f having two holes 10g opening opposite to each other in the circumferential force direction in place of the female threaded portion 10a of the above-mentioned embodiment. The structure is as follows.

Further, unlike the above-mentioned fixing member 15, the fixing member 15' is made of a Daruma clip formed from a steel wire like a piano wire into a substantially U-shape. 'c.

Next, the mounting method of this embodiment will be described.

First, the temperature sensor 1 is attached to the outer periphery of the cylindrical part 3b below the collar part 3c of the metal case 3 using the same procedure as in the above-mentioned embodiment.
With the ring 18 fitted, the collar 3c is attached to the mounting seat 1.
Insert it into the mounting seat 10 until it abuts the stepped portion 10d.

Thereafter, the fixing member 15' is inserted through the hole Log provided in the mounting seat 1o, and the arcuate portion 15'c is fitted onto the outer periphery of the cylindrical portion 3a of the metal case 3, thereby completing the mounting of the temperature sensor 1. That is, the flange 3c of the metal case 3 is held between the fixing member 15' that is locked in the hole log of the mounting seat 10 and the stepped portion 10d of the transfer seat 10, so that the temperature sensor 1 is securely moved in the axial direction. Fixed. Further, even if an external force such as vibration is applied from the outside, the fixed member 15' will not fall off because its arcuate portion 15'c is fitted to the outer periphery of the cylindrical portion 3a of the metal case 3.

Here, when removing the temperature sensor 1, fixing part) material 15
The axial fixation to the metal case 3 can be released by pulling the bottom part 15'a of the metal case 3 outward and pulling out the fixing member 15'.

In this embodiment, a fixing member 15' is provided in the mounting seat 10 without using a screw connection as a locking means for the mounting seat 10 and the fixing member 15 as in the previous embodiment.
This has the effect that the installation work can be easily completed by simply inserting it into g.

Next, still another embodiment shown in FIGS. 5 to 7 will be described. Temperature detector 1 of this embodiment. This embodiment also has exactly the same configuration as the two embodiments described above.

The mounting seat 10 is substantially the same as that of the embodiment shown in FIG. ,
The cylindrical portion 10f has a tapered portion 10h at the upper part of the circumference.

Further, as shown in FIG. 7, the fixing member 15' includes a rectangular plate part 15'b having a through hole 151a through which the cylindrical part 3a of the metal case 3 is passed, and a rectangular plate part 15'b bent at a substantially right angle from the rectangular plate part 15'b. 2.P leg portions 15'c extending oppositely in the axial direction;
A locking portion 151d having an arcuate tip protruding outward from the tip of the leg portion 151o is formed by pressing a steel plate having spring properties.

Next, the mounting method of this embodiment will be described.

First, temperature sensor 1 is installed using exactly the same procedure as in the previous example.
The metal case 3 is inserted into the mounting seat 1o until the collar 3c contacts the step 10d of the mounting seat 1°.

Thereafter, the electrode wire 4 and the cylindrical part 3a of the metal case 3 are passed through the through hole 151a, and the fixing member 15' is inserted into the cylindrical part 10f of the mounting seat 10 from above. Along with this, the locking part 151d of the fixing member 15' is connected to the cylindrical part 10f.
The tapered portion 10h of the leg portion 15' is gradually pushed inward.
c was on the inside.

6, the locking portion 15'd comes into contact with the flange portion 3c in a substantially Z-shaped deformed state (0) as shown by the dashed line in the right cross section of FIG. Here, when the fixing member 15' is rotated and the locking part 151d is positioned opposite to the hole 10g provided in the mounting seat 10, the deflection given to the one leg part 15'c is released, and the locking part 15 'd protrudes into the hole 10g,
The installation of the temperature sensor 1 is completed when the state shown by the solid line (■) shown in the left cross section of FIG. 6 is reached. That is, the collar portion 3c of the metal case 3 is held between the locking portion 15'd of the fixing member 15' that is locked in the hole Log of the mounting seat 10 and the stepped portion 10d of the mounting member 10, and the temperature is detected. The device 1 is securely fixed in the axial direction.

Next, when removing the temperature sensor 1, rotate the fixing member 151 in the reverse order of the installation procedure to bring it into the ω state, and then pull out the fixing member 15'' upwards. can be easily unfixed.

In this embodiment, the temperature sensor 1 can be mounted without using a screw connection as in the embodiment shown in FIG. 1, and a space is required for inserting the fixing member 15' from the circumferential direction as shown in FIG. There is an effect that the fixing member 151 can be easily attached and detached from the axial direction, which is the same direction as the direction in which the temperature sensor 1 is inserted into the mounting seat 10.

〔Effect of the invention〕

According to the present invention, the following effects can be obtained.

(1) Since the connection part of the temperature sensor and electrode wire is sealed and fixed inside the metal case via an insulator, it is possible to prevent moisture from entering from the outside, preventing poor insulation, deterioration of the temperature sensor, or electrode wire. Corrosion can be prevented. Also,
Since they are protected by a metal case, the temperature sensor and electrode wires will not be damaged by external forces applied during handling.

Note that since the temperature sensor is exposed in the refrigerant, which is the object to be measured, through the metal case with good thermal conductivity, sufficient responsiveness and detection accuracy can be ensured.

(2) Since the temperature sensor can be mounted on the mounting seat without rotating, the O-ring can be compressed without twisting between the outer circumferential surface of the metal case of the temperature sensor and the inner circumferential surface of the mounting seat. Since it can be installed reliably, highly reliable sealing performance can be obtained.

(3) Since the temperature sensor can be attached to the mounting base without directly rotating it, the temperature sensor 1 can be attached and detached without twisting the electrode wire even when the electrode wire is connected to an external circuit. , the electrode wire will not break,
And work efficiency is greatly improved.

(4) Since the temperature sensor can be easily mounted on the mounting base without necessarily using a screw connection, the space required for mounting is small and the workability of mounting and dismounting is improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the installed state of a temperature detection device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the temperature detection device shown in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-mV in FIG. 3; FIG. 5 is a plan view showing the mounting state of the temperature detection device according to another embodiment; 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a perspective view of the fixing member in FIG. 6. DESCRIPTION OF SYMBOLS 1...Temperature detector, 2...Temperature sensor, 3...Metal case, 3a, 3b...Cylindrical part, 3c...Brim part, 3d...Bottom part, 4...Electrode wire , 5... insulation part,
6... Insulating coating, 10... Mounting seat, 10a
...Through hole, 10b...Guiding part, 10c...0 ring groove, 10d...Step part, 10e...Female thread part, 1
0f... Cylindrical part, tog... Hole, 10h... Tapered part, 15... Fixing member, 15a... Through hole, 1
5b...Press surface, 15c...Male thread part. 15d...Spanner hook part, 15'...Fixing member. ]5'a...bottom, 15'b...tip, 15'
C...Circular arc portion, 15'...Fixing member, 15'a...
・Through hole, 15"b... Rectangular plate part, 151C... Leg part, 151d... Locking part, 18... 0 ring, 20
...Refrigerant piping.

Claims (4)

[Claims] 1. The temperature sensor is directly exposed inside the container that houses the object to be measured, and an O-ring is arranged between the temperature sensor and the mounting seat that is integrally attached to the container to keep the object to be measured airtight. In the temperature detection device, the temperature sensor is constructed by enclosing and fixing a temperature sensor to which electrode wires are connected in a bottomed cylindrical metal case having a flange on a part of the outer periphery via an insulator. , the mounting seat is configured in a cylindrical shape having a through hole for passing the temperature sensor into the container, a stepped portion for axially receiving the collar of the metal case, and an O-ring groove for accommodating the O-ring. At the same time, a fixing member that can be detachably attached to the mounting seat is provided with the engaging portion facing the inner periphery of the mounting seat, a temperature sensor is inserted into the mounting seat, and the flange of the metal case is attached to the mounting seat. A temperature detection device characterized in that the O-ring is held between the stepped portion of the metal case and the engaging portion of the fixing member, and the O-ring is compressed and held between the outer peripheral surface of the metal case and the O-ring groove of the mounting surface. 2. 2. The temperature detection device according to claim 1, wherein the fixing member and the mounting seat are removably engaged with each other by screw connection. 3. A hole opening in the circumferential direction is provided in the mounting seat, a fixing member is inserted through the hole, and the collar of the metal case is inserted between the fixing member locked in the hole and the step of the mounting seat. The temperature detection device according to claim 1, wherein the temperature detection device is clamped in the axial direction. 4. A recess is provided in the inner peripheral surface of the mounting seat in the circumferential force direction, and a part of the fixing member inserted from the axial direction projects into the recess, so that the part of the fixing member locked in this recess and the mounting seat are 2. The temperature detection device according to claim 1, wherein the flange portion of the metal case is axially held between the step portion and the step portion.