JP7423421B2 - Piping temperature detection device - Google Patents

Description

The present invention relates to a pipe temperature detection device for detecting the surface temperature of a pipe disposed in an air conditioner or the like and through which hot water, cold water, refrigerant, or the like flows.

Patent Documents 1 to 3 listed below disclose piping temperature detection devices for detecting the surface temperature of piping installed in an air conditioner or the like and through which hot water, cold water, refrigerant, or the like flows. Such a pipe temperature detection device includes a temperature detector and a mounting clip member, each of which is constructed separately. A typical example of a temperature sensor includes a thermistor element, a pair of lead wires connected to the thermistor element, and a case member, and the ends of the thermistor element and the pair of lead wires are housed in the case member. There is. The case member is made of a suitable material such as a thin copper plate, and has a cylindrical outer peripheral surface. The attachment clip member, which is made of a thin metal plate such as a stainless steel plate, has a storage part for storing a part of the case member of the temperature sensor, and a fitting part to be fitted into the pipe whose surface temperature is to be detected. Contains. In the piping temperature sensor disclosed in Patent Document 1 below, the storage portion of the mounting clip member has an arc shape extending over 180 degrees in the cross section, and the fitted portion of the mounting clip member has a circular arc shape extending over 180 degrees in the cross section. It has an arc-shaped first portion extending from one edge of the storage portion and a second arc-shaped portion extending from the other edge of the storage portion. The circumferential extension lengths of the first portion and the second portion constituting the fitted portion are substantially the same. The radius of curvature of the inner peripheral surface of the housing part of the mounting clip member is the same as the radius of curvature of the outer peripheral surface of the case member of the temperature sensor, and The radius of curvature of the circumferential surface is the same as the radius of curvature of the outer circumferential surface of the pipe.

When using the piping temperature detection device, first store a part of the temperature sensor, more specifically, a part of the case member in the longitudinal direction, in the storage part of the mounting clip member, and then insert the mounting clip member into the housing. The part is fitted onto the outer peripheral surface of the pipe. When fitting the fitting part of the mounting clip member onto the outer peripheral surface of the pipe, the first part and the second part of the fitting part are elastically displaced and the pipe is positioned between them. The fitting part is elastically fitted onto the outer circumferential surface of.

Microfilm of Utility Application No. 60-154353 Microfilm of Jitsugan No. 1-1969 Japanese Patent Application Publication No. 10-132431

Therefore, in the conventional pipe temperature detection device as described above, a part of the temperature sensor is stored as required in the storage part of the mounting clip member, and then the fitted part of the mounting clip member is inserted around the outer periphery of the pipe. It is necessary to fit the temperature sensor onto the outer surface of the pipe, making it complicated to attach it to the pipe, and because the temperature sensor is not fixed to the mounting clip member, it is difficult to attach the temperature sensor to the outer circumferential surface of the pipe as required. The problem is that positioning is not always easy.

The present invention has been made in view of the above facts, and its main technical problem is to be able to easily and quickly attach a temperature sensor to the outer circumferential surface of the pipe, and to attach a temperature sensor to the outer circumferential surface of the pipe as required. It is an object of the present invention to provide a new and improved pipe temperature sensing device that can be positioned with sufficient precision.

As a result of intensive research and experiments, the present inventors filled the space between the inner peripheral surface of the storage part of the mounting clip member and the outer peripheral surface of a part of the temperature sensor stored in the storage part of the mounting clip member. A part of the temperature sensor is fixed to the housing portion of the mounting clip member by the filled resin layer, and the first portion of the fitted portion of the mounting clip member extends over an angular range of 150 degrees to 190 degrees in the circumferential direction. The second portion of the fitted portion of the attachment clip member extends over an angular range of 40 degrees to 60 degrees, and the distal edge of the first portion and the distal edge of the second portion It has been found that the above main technical problem can be achieved by creating a configuration in which a gap exists over an angular range of 60 degrees to 80 degrees.

That is, according to the present invention, as a pipe temperature detection device that achieves the above-mentioned main technical problem,
A temperature sensor including a thermistor element and a pair of lead wires connected to the thermistor element, a storage part that accommodates a part of the temperature sensor, and a cover that is fitted into a cylindrical pipe whose surface temperature is to be detected. A pipe temperature detection device comprising a mounting clip member including a fitting part,
The storage portion of the mounting clip member has an arc shape extending over 180 degrees in the cross section, and the fitted portion of the mounting clip member extends from one circumferential edge of the storage portion in the cross section. a circular arc-shaped first portion extending from the other end edge in the circumferential direction of the storage portion;
The first portion of the fitted portion of the mounting clip member extends circumferentially over an angular range of 150 degrees to 190 degrees, and the second portion of the fitted portion of the mounting clip member extends extending over an angular range of 40 degrees to 60 degrees, and extending over an angular range of 60 degrees to 80 degrees between the leading edge of the first portion and the leading edge of the second portion. There is a gap,
A filling resin layer is disposed between the outer peripheral surface of the part of the temperature sensor stored in the storage part of the mounting clip member and the inner peripheral surface of the storage part of the mounting clip member. , the part of the temperature sensor is fixed to the housing part of the attachment clip member by the filled resin layer;
A piping temperature detection device is provided.

Preferably, the radius of curvature of the inner peripheral surface of the first portion and the second portion of the fitted portion of the mounting clip member is the same as the radius of curvature of the outer peripheral surface of the pipe, and is larger than the radius of curvature of the inner circumferential surface of the storage portion. It is preferable that a guide portion extending radially outward is attached to a distal end edge of the first portion and a distal end edge of the second portion of the fitted portion of the attachment clip member, respectively. It is. The storage portion of the mounting clip member is formed with a protruding piece that protrudes radially inward from a part of the wall defining the storage portion, and the fitting portion of the mounting clip member is formed with a projecting piece that projects radially inward. Preferably, the portion is formed with a protruding piece that causes a part of the wall defining the fitted portion to protrude radially inward. Advantageously, the filling resin is an epoxy resin or a silicone resin and the mounting clip member is formed from sheet metal. In a preferred embodiment, the temperature sensor includes a synthetic resin coat surrounding the thermistor element and the tips of the pair of lead wires, and a portion of the coat is housed in the housing portion of the mounting clip member. ing.

In the piping temperature detection device of the present invention, a filled resin layer is disposed between the inner peripheral surface of the storage portion of the mounting clip member and the outer peripheral surface of a part of the temperature sensor stored in the storage portion of the mounting clip member. Since a part of the temperature sensor is fixed in the storage part of the mounting clip member by the filled resin layer, the piping can be removed by simply fitting the fitted part of the mounting clip member onto the outer circumferential surface of the pipe. The temperature sensor can be easily and quickly attached to the pipe, and the temperature sensor can be positioned with sufficient precision as required with respect to the outer peripheral surface of the pipe. Additionally, the first portion of the fitted portion of the attachment clip member extends circumferentially over an angular range of 150 degrees to 190 degrees, and the second portion of the fitted portion of the attachment clip member extends circumferentially over an angular range of 40 degrees to 190 degrees. It extends over an angular range of 60 degrees, and a gap exists between the leading edge of the first part and the leading edge of the second part over an angular range of 60 degrees to 80 degrees. Therefore, when the fitted portion of the mounting clip member is fitted onto the outer peripheral surface of the piping whose surface temperature is to be detected, the filled resin layer may be peeled off from the inner peripheral surface of the housing portion of the mounting clip member. is effectively prevented.

FIG. 1 is a perspective view showing a preferred embodiment of a pipe temperature detection device configured according to the present invention. FIG. 2 is a sectional view of the pipe temperature detection device shown in FIG. 1. FIG. 2 is a perspective view showing a temperature detector in the pipe temperature detection device shown in FIG. 1. FIG. FIG. 2 is a perspective view showing a mounting clip member in the pipe temperature detection device shown in FIG. 1; FIG. 2 is a side view of the attachment clip member shown in FIG. 1; FIG. 2 is a sectional view showing a state in which the pipe temperature sensor shown in FIG. 1 is attached to a pipe.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a pipe temperature detection device constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, a pipe temperature sensing device constructed in accordance with the present invention, generally designated by the numeral 2, includes a temperature sensor 4 and a mounting clip member 6. As shown in FIGS.

As can be seen by referring to FIG. 3 in conjunction with FIGS. 1 and 2, temperature sensor 4 in the illustrated embodiment includes a thermistor element 8 and a pair of leads 10a and 10b. The ends of the pair of lead wires 10a and 10b have their insulation coatings peeled off and are connected to the thermistor element 8. A temperature detector is a GRC (glass sealed redial lead chip) in which the thermistor element and the tips of a pair of lead wires connected to the thermistor element are sealed with glass, and the pair of lead wires are connected to the pair of lead wires. (thermistor) type can also be used advantageously. In the illustrated embodiment, the thermistor element 8 and the tips of the pair of lead wires 10a and 10b are made of an epoxy resin that is excellent in heat resistance and insulation and has relatively high thermal conductivity, especially low viscosity and low elastic modulus. It is surrounded by a synthetic resin coat 12, which is conveniently a flexible epoxy or silicone resin. The pair of lead wires 10a and 10b extend beyond the rear end surface of the coat 12, and the extending ends of the pair of lead wires 10a and 10b are connected to a temperature detection circuit (not shown). If desired, the coat 12 may be housed in a cylindrical case member (not shown) with a closed front end formed from a thin metal plate such as a thin copper plate, or the thermistor element 8 and a pair of leads may be placed within the case member. The coat 12 can also be surrounded by a case member by filling the case member with a synthetic resin constituting the coat after introducing the tips of the wires 10a and 10b.

Continuing the description with reference to FIGS. 4 and 5 in conjunction with FIGS. 1 and 2, the attachment clip member 6 in the illustrated embodiment is integrally formed from a suitable sheet metal, such as a sheet of stainless steel, and includes a housing. 14 and a fitted portion 16. The storage portion 14 has an arcuate shape extending over an angular range α of 180 degrees or more, preferably 240 to 260 degrees, in a cross section, that is, in FIG. be. In the cross section, that is, in FIG. 2, the fitted portion 16 includes a first arc-shaped portion 16a extending from one edge of the storage portion 14 and a second arc-shaped portion extending from the other edge of the storage portion 14. 16b. The circumferential extension lengths of the first portion 16a and the second portion 16b constituting the fitted portion 16 are not the same, and the first portion 16a extends over an angular range β of 150 degrees to 190 degrees. The second portion 16b extends over an angular range γ of 40 degrees to 60 degrees, and there is a distal edge between the distal edge of the first portion 16a and the distal edge of the second portion 16b. It is important that the gap exists over an angular range δ which is between 60 degrees and 80 degrees. Furthermore, as can be understood by referring to FIG. In other words, in the downstream side in the direction away from the storage section 14, both side edges are gradually reduced in the direction away from the storage section 14. Advantageously, it slopes gradually inward in the width direction. The radius of curvature R1 of the inner circumferential surface of the first portion 16a of the fitted portion 16 and the radius of curvature R2 of the inner circumferential surface of the second portion 16b are both the radius of curvature R4 of the outer circumferential surface of the pipe 26 whose surface temperature is to be detected. (FIG. 6) is preferred (R1=R2=R4). It is desirable that the radius of curvature R3 of the inner circumferential surface of the storage portion 14 is somewhat smaller than the curvature radii R1, R2, and R4, but somewhat larger than the curvature range R5 of the outer circumferential surface of the coat 12 of the temperature sensor 4 ( R1=R2>R3>R5).

The attachment clip member 6 in the illustrated embodiment further includes a guide portion 18a extending radially outward from the distal end edge of the first portion 16a of the fitted portion 16, and a guide portion 18a extending radially outward from the distal end edge of the first portion 16a of the fitted portion 16. It includes a guide portion 18b extending radially outward from the tip. As can be clearly understood by referring to FIGS. 2 and 4, the storage section 14 has a protruding piece 20 (FIG. 4) that projects a part of the wall defining the storage section 14 inward in the radial direction. Similarly, it is desirable that the fitted portion 16 is formed with a protruding piece 22 that causes a part of the wall defining the fitted portion 16 to protrude inward in the radial direction. The protruding piece 20 is formed by forming a gate-shaped or inverted channel-shaped slit in the wall defining the storage portion 14, and causing the portion defined by the slit to protrude radially inward. Similarly, the protruding piece 22 is formed by forming a gate-shaped or inverted channel-shaped slit in the wall defining the fitted portion 16, and causing the portion defined by the slit to protrude inward in the radial direction. There is.

As shown in FIGS. 1 and 2, a portion of the temperature sensor 4 described above, in the illustrated embodiment the front half of the coat 12, is preferably positioned concentrically within the recess 14 of the attachment clip member 6. Then, a synthetic resin is filled between the inner circumferential surface of the storage portion 14 and the outer circumferential surface of the coat 12 and hardened, thus providing a filled resin layer 24. Then, a part of the temperature sensor 4, more specifically, the outer peripheral surface of the front half of the coat 12, is fixed to the inner peripheral surface of the storage portion 14 of the mounting clip member 6 by the filled resin layer 24. The protruding piece 20 formed in the housing portion 14 of the attachment clip member 6 is surrounded by the filled resin layer 24, thereby promoting the adhesion between the housing portion 14 and the filled resin layer 24. The synthetic resin constituting the filled resin layer 24 is an epoxy resin, especially a low A flexible epoxy resin or silicone resin having low viscosity and low elastic modulus is preferred. As clearly illustrated in FIG. 2, the exposed surface 24a of the mounting clip member 6 in the filled resin layer 24 without being surrounded by the storage portion 14 has a radius of curvature R4 of the outer peripheral surface of the pipe 26 whose surface temperature is to be detected. Advantageously, it is a concave curved surface with a radius of curvature R6 which is practically the same as (R4=R6). Such a concave curved surface 24a can be formed by using a regulating frame member (not shown) having an inner peripheral surface corresponding to the outer peripheral surface of the pipe 26 when filling the synthetic resin in a softened or molten state. Can be done.

FIG. 6 illustrates a state in which the above-described pipe temperature detection device 2 is attached to the outer peripheral surface of the pipe 26 whose surface temperature is to be detected. When attaching the temperature detection device 2 to the piping 26, the fitted portion 16 of the attachment clip member 6 is attached to the outer peripheral surface of the piping 26, and more specifically, the tip edge of the first portion 16a of the fitted portion 16 and the second The gap between the tip edge of the portion 16b is positioned opposite to the outer circumferential surface of the pipe 26, and the fitted portion 16 is forced toward the pipe 26, so that the fitted portion 16 is fitted onto the outer circumferential surface of the pipe 26. . At this time, the fitted portion 16 is guided with respect to the pipe 26 by the guide portions 18a and 18b. When the fitted portion 16 is fitted onto the outer circumferential surface of the pipe 26, this is due to the fact that the circumferential extension length of the first portion 16a is longer than the circumferential extension length of the second portion 16b. Furthermore, the width of the first portion 16a is gradually reduced in the direction away from the storage portion 14 at the downstream side when viewed in the direction away from the storage portion 14. The portion 16a, particularly the downstream portion in the direction away from the storage portion 14, is more elastically displaced or deformed than the upstream portion. The protruding piece 22 formed on the fitted portion 16 partially bites into the outer circumferential surface of the pipe 26, so that the mounting clip member 6 is sufficiently firmly attached to the outer circumferential surface of the pipe 26.

As described above, when attaching the attachment clip member 6 to the outer circumferential surface of the pipe 26, the first portion 16a of the fitted portion 16, especially the downstream portion in the direction away from the storage portion 14, is elastically As a result, the elastic displacement or deformation of the storage portion 14 of the mounting clip member 6 is suppressed as much as possible, and the filled resin layer 24 may be peeled off from the inner circumferential surface of the storage portion 14. is prevented. According to the experience of the present inventors, when the circumferential extension length of the first portion 16a of the fitted portion 16 and the circumferential extension length of the second portion 16b are set to be approximately the same (and (in the case where the widths of the first part 16a and the second part 16b are not particularly changed), when fitting the fitted part 16 onto the outer peripheral surface of the pipe 26, the first part 16a and the second part 16b of the fitted part 16 are Both the second portion 16b and the second portion 16b are elastically displaced or deformed almost equally, and accordingly, the storage portion 14 of the mounting clip member 6 is also elastically displaced or deformed. There is a tendency for the filled resin layer 24 to peel off from the inner peripheral surface. Furthermore, in the illustrated embodiment, since the protruding piece 20 formed in the storage section 14 is surrounded by the filled resin layer 24, the filled resin layer 24 may be detached from the inner peripheral surface of the storage section 14. is more reliably prevented.

As clearly understood by referring to FIG. 6, when the attachment clip member 6 is attached to the outer peripheral surface of the pipe 26, the radius of curvature of the concave curved surface 24a of the filled resin layer 24 disposed in the storage portion 14 Since R6 is substantially the same as the radius of curvature R4 of the outer peripheral surface of the pipe 26, the concave curved surface 24a of the filled resin layer 24 effectively conducts heat to the thermistor element 6 of the pipe detector 4, resulting in good temperature detection sensitivity. can get.

2: Temperature detection device 4: Temperature detector 6: Mounting clip member 8: Thermistor element 10a: Lead wire 10b: Lead wire 12: Coat 14: Storage portion 16: Fitted portion 16a: First portion of fitted portion 16b : Second part of fitted part 18a: Guide part 18b: Guide part 20: Projecting piece 22: Projecting piece 24: Filled resin layer 26: Piping

Claims (10)

A temperature sensor including a thermistor element and a pair of lead wires connected to the thermistor element, a storage part that houses a part of the temperature sensor, and a cover that is fitted into a cylindrical pipe whose surface temperature is to be detected. A pipe temperature detection device comprising a mounting clip member including a fitting part,
The storage portion of the attachment clip member has an arcuate shape extending over 180 degrees in a cross section, and the fitted portion of the attachment clip member extends from one circumferential edge of the storage portion in the cross section. a circular arc-shaped first portion extending from the other end edge in the circumferential direction of the storage portion;
The first portion of the fitted portion of the mounting clip member extends circumferentially over an angular range of 150 degrees to 190 degrees, and the second portion of the fitted portion of the mounting cup member extends extending over an angular range of 40 degrees to 60 degrees, and extending over an angular range of 60 degrees to 80 degrees between the leading edge of the first portion and the leading edge of the second portion. There is a gap,
A filling resin layer is disposed between the outer peripheral surface of the part of the temperature sensor stored in the storage part of the mounting clip member and the inner peripheral surface of the storage part of the mounting clip member. , the part of the temperature sensor is fixed to the housing part of the attachment clip member by the filled resin layer;
A piping temperature detection device characterized by: A downstream portion of the first portion of the fitted portion of the mounting clip when viewed in a direction away from the storage portion has a width that gradually decreases in a direction away from the storage portion. The piping temperature detection device according to item 1. The surface of the filling resin layer that is exposed without being surrounded by the storage portion of the attachment clip member is a concave curved surface having the same radius of curvature as the radius of curvature of the outer peripheral surface of the pipe. 2. The pipe temperature detection device according to 2. The radius of curvature of the inner peripheral surface of the first portion and the second portion of the fitted portion of the mounting clip member is the same as the radius of curvature of the outer peripheral surface of the pipe, and The piping temperature detection device according to any one of claims 1 to 3, wherein the radius of curvature is larger than the radius of curvature of the inner circumferential surface of the pipe. A guide portion extending radially outward is attached to a distal end edge of the first portion and a distal end edge of the second portion of the fitted portion of the attachment clip member, respectively. 5. The piping temperature detection device according to any one of 1 to 4. Any one of claims 1 to 5, wherein the storage portion of the mounting clip member is formed with a protruding piece that causes a part of a wall defining the storage portion to protrude radially inward. The pipe temperature detection device described. Any one of claims 1 to 6, wherein the fitted portion of the mounting clip member is formed with a protruding piece that causes a part of a wall defining the fitted portion to protrude radially inward. Piping temperature detection device described in . The piping temperature detection device according to any one of claims 1 to 7, wherein the filling resin is an epoxy resin or a silicone resin. 9. A pipe temperature sensing device according to claim 1, wherein the mounting clip member is formed from a thin metal plate. 2. The temperature sensor includes a synthetic resin coat surrounding the thermistor element and the tips of the pair of lead wires, and a portion of the coat is housed in the housing of the mounting clip member. 9. The piping temperature detection device according to any one of 9 to 9.