JP2021188780A - Pipe temperature detection device - Google Patents

Abstract

To provide a pipe temperature detection device that can be easily and quickly attached to a pipe and allows a temperature detector to be sufficiently precisely positioned to the outer peripheral surface of the pipe as specified.SOLUTION: Between the outer peripheral surface of a part of a temperature detector 4 contained in a housing 14 of a clip attachment 6 and the inner peripheral surface of the housing 14 of the clip attachment 6, a resin filling layer 24 is disposed. The resin filling layer 24 fixes the part of the temperature detector 4 to the housing 14 of the clip attachment 6.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe temperature detecting device for detecting the surface temperature of a pipe arranged in an air conditioner or the like and to which hot water, cold water, a refrigerant or the like is allowed to flow.

The following Patent Documents 1 to 3 disclose a pipe temperature detecting device for detecting the surface temperature of a pipe arranged in an air conditioner or the like and in which hot water, cold water, a refrigerant or the like is allowed to flow. Such a pipe temperature detecting device includes a temperature detector and a mounting clip member, which are individually configured. A typical example of a temperature detector includes a thermistor element, a pair of lead wires and a case member connected to the thermistor element, and the thermistor element and the tip of the pair of lead wires are housed in the case member. There is. The case member is made of an appropriate material such as a thin copper plate, and its outer peripheral surface has a cylindrical shape. The mounting clip member 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 detector and a fitting part fitted to a pipe for detecting the surface temperature. Includes. In the piping temperature detector disclosed in Patent Document 1 below, the accommodating portion of the mounting clip member has an arc shape extending beyond 180 degrees in the cross section, and the fitting portion of the mounting clip member has an arc shape extending over 180 degrees in the cross section. It has a first portion of the arc shape extending from one end edge of the storage portion and a second portion of the arc shape extending from the other end 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 storage portion 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 detector, and the inside of the first portion and the second portion of the fitted portion of the mounting clip member. The radius of curvature of the peripheral surface is the same as the radius of curvature of the outer peripheral surface of the pipe.

When using the piping temperature detector, first store a part of the temperature detector, more specifically, a part of the case member in the longitudinal direction in the storage part of the mounting clip member, and then the mounting clip member is fitted. The portion is fitted to the outer peripheral surface of the pipe. When the fitted portion of the mounting clip member is fitted to the outer peripheral surface of the pipe, the pipe is positioned between the first portion and the second portion of the fitted portion while being elastically displaced. The fitted portion is elastically fitted on the outer peripheral surface of the.

Microfilm of No. 60-154353 Microfilm of Jitsugyo Hei 1-1969 Japanese Unexamined Patent Publication No. 10-132431

Therefore, in the conventional pipe temperature detection device as described above, a part of the temperature detector is housed in the storage part of the mounting clip member as required, and then the fitted part of the mounting clip member is placed on the outer periphery of the pipe. Since it is necessary to fit on the surface, mounting to the pipe is complicated, and the temperature detector is not fixed to the mounting clip member, the temperature detector is mounted on the outer peripheral surface of the pipe as required. There is a problem that it is not always easy to position.

The present invention has been made in view of the above facts, and its main technical problem is that it can be easily and quickly mounted on the pipe and a temperature detector is provided on the outer peripheral surface of the pipe as required. It is to provide a new and improved pipe temperature detection device that can be positioned with sufficient precision.

As a result of diligent research and experiments, the present inventors have filled a resin 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 detector housed in the storage portion of the mounting clip member. A part of the temperature detector is fixed to the storage part of the mounting clip member by the filling resin layer, and the first part of the fitting part of the mounting clip member extends over an angle range of 150 to 190 degrees in the circumferential direction. The second portion of the fitted portion of the mounting clip member extends over an angle range of 40 to 60 degrees, with the tip edge of the first portion and the tip edge of the second portion. It has been found that the above-mentioned main technical problem can be achieved by forming a form in which a gap exists over an angle range of 60 to 80 degrees.

That is, according to the present invention, as a pipe temperature detecting device that achieves the above-mentioned main technical problem,
A temperature detector containing a thermistor element and a pair of lead wires connected to the thermistor element, a storage portion accommodating a part of the temperature detector, and a cylindrical pipe for detecting the surface temperature. In a piping temperature detection device including a mounting clip member including a fitting portion,
The accommodating portion of the mounting clip member has an arc shape extending beyond 180 degrees in the cross section, and the fitted portion of the mounting clip member extends from one end edge in the circumferential direction of the accommodating portion in the cross section. It has a first portion of the existing arc shape and a second portion of the arc shape 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 angle range of 150 to 190 degrees, and the second portion of the fitted portion of the mounting clip member extends. It extends over an angle range of 40 to 60 degrees, and between the tip edge of the first portion and the tip edge of the second portion over an angle range of 60 to 80 degrees. There is a gap,
A filled resin layer is disposed between the outer peripheral surface of a part of the temperature detector housed in the storage portion of the mounting clip member and the inner peripheral surface of the storage portion of the mounting clip member. The part of the temperature detector is fixed to the storage portion of the mounting clip member by the filling resin layer.
A piping temperature detection device characterized by this 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 the mounting clip member It is larger than the radius of curvature of the inner peripheral surface of the storage portion. It is preferable that the tip edge of the first portion and the tip edge of the second portion of the fitted portion of the mounting clip member are each provided with a guide portion extending outward in the radial direction. Is. The storage portion of the mounting clip member is formed with a protruding piece formed by projecting a part of the wall defining the storage portion inward in the radial direction, and also the fitting of the mounting clip member. It is desirable that the portion is formed with a protruding piece in which a part of the wall defining the fitted portion is projected inward in the radial direction. The filling resin is an epoxy resin or a silicone resin, and it is convenient that the mounting clip member is made of a thin metal plate. In a preferred embodiment, the temperature detector comprises a synthetic resin coat that surrounds the thermistor element and the tips of the pair of leads, and a portion of the coat is housed in the storage of the mounting clip member. ing.

In the piping temperature detection device of the present invention, a filled resin layer is arranged 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 detector housed in the storage portion of the mounting clip member. Since a part of the temperature detector is fixed in the storage portion of the mounting clip member by the filling resin layer, the fitting portion of the mounting clip member is simply fitted to the outer peripheral surface of the piping to form the pipe. The temperature detector can be easily and quickly mounted on the outer peripheral surface of the pipe, and the temperature detector can be positioned with sufficient precision as required. In addition, the first portion of the fitted portion of the mounting clip member extends over an angle range of 150 to 190 degrees in the circumferential direction, and the second portion of the fitted portion of the mounting clip member extends from 40 degrees to 40 degrees. A form that extends over an angle range of 60 degrees and has a gap over an angle range of 60 to 80 degrees between the tip edge of the first part and the tip edge of the second part. Therefore, when the fitted portion of the mounting clip member is fitted to the outer peripheral surface of the pipe whose surface temperature should be detected, the filling resin layer is peeled off from the inner peripheral surface of the storage portion of the mounting clip member. Is effectively prevented.

The slope view which shows the preferable embodiment of the pipe temperature detection apparatus configured according to this invention. FIG. 3 is a cross-sectional view of the pipe temperature detection device shown in FIG. The slope view which shows the temperature detector in the pipe temperature detection apparatus shown in FIG. The slope view which shows the mounting clip member in the pipe temperature detection apparatus shown in FIG. The side view of the mounting clip member shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the pipe temperature detector shown in FIG. 1 is attached to the pipe.

Hereinafter, preferred embodiments of the piping temperature detection device configured according to the present invention will be described in detail with reference to the accompanying drawings.

Explaining with reference to FIGS. 1 and 2, the piping temperature detecting device configured according to the present invention, which is entirely indicated by No. 2, includes a temperature detector 4 and a mounting clip member 6.

As understood by reference to FIG. 3 with FIGS. 1 and 2, the temperature detector 4 in the illustrated embodiment includes a thermistor element 8 and a pair of lead wires 10a and 10b. The tips of the pair of lead wires 10a and 10b are stripped of the insulating coating and are connected to the thermistor element 8. As a temperature detector, the thermistor element and the tip of a pair of leader wires connected to the thermistor element are sealed with glass, and the pair of leader wires are connected to the pair of lead wires. Thermistor) type can also be conveniently used. In the illustrated embodiment, the tips of the pair of lead wires 10a and 10b together with the thermista element 8 have an epoxy resin having excellent heat resistance and insulating properties and a relatively large thermal conductivity, particularly low viscosity and low elastic modulus. It is surrounded by a synthetic resin coat 12, which is preferably a flexible epoxy resin or a 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 is housed in a cylindrical case member (not shown) with a closed front end face formed from a thin metal plate such as a copper thin plate, or the thermistor element 8 and a pair of leads are housed in the case member. The coat 12 can also be surrounded by the case member by filling the case member with the synthetic resin constituting the coat after introducing the tip portions of the wires 10a and 10b.

Continuing the description with reference to FIGS. 4 and 5 together with FIGS. 1 and 2, the mounting clip member 6 in the illustrated embodiment is integrally formed of an appropriate metal thin plate such as a stainless steel thin plate, and is a storage unit. It has 14 and a fitted portion 16. The storage portion 14 has an arc shape extending over an angle range α, that is, in the cross section, that is, in FIG. 2, beyond the angle range of 180 degrees, in other words, 180 degrees or more, preferably 240 degrees to 260 degrees. be. The fitted portion 16 has a first portion 16a having an arc shape extending from one end edge of the storage portion 14 and a second portion having an arc shape extending from the other end edge of the storage portion 14 in the cross section, that is, in FIG. Has 16b and. 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 angle range β of 150 to 190 degrees. Extending, the second portion 16b extends over an angular range γ of 40 to 60 degrees, and between the tip edge of the first portion 16a and the tip edge of the second portion 16b. It is important that there is a gap over the angle range δ, which is 60 to 80 degrees. Further, as will be understood by referring to FIG. 5, the first portion 16a of the fitted portion 16 is located on the downstream side portion (distance from the storage portion 14) when viewed in a direction away from the storage portion 14. In the portion), the width is gradually reduced toward the direction away from the storage portion 14, in other words, in the downstream side portion in the direction away from the storage portion 14, both edges are toward the direction away from the storage portion 14. It is convenient that it is gradually inclined inward in the width direction. Both the radius of curvature R1 of the inner peripheral surface of the first portion 16a of the fitted portion 16 and the radius of curvature R2 of the inner peripheral surface of the second portion 16b are the radius of curvature R4 of the outer peripheral surface of the pipe 26 for which the surface temperature should be detected. It is preferably substantially the same as (FIG. 6) (R1 = R2 = R4). The radius of curvature R3 of the inner peripheral surface of the accommodating portion 14 is slightly smaller than the radius of curvature R1, R2 and R4, but is preferably slightly larger than the curvature range R5 of the outer peripheral surface of the coat 12 of the temperature detector 4. R1 = R2> R3> R5).

The mounting clip member 6 in the illustrated embodiment further comprises a guide portion 18a extending radially outward from the tip edge of the first portion 16a of the fitting portion 16 and a second portion 16b of the fitting portion 16. It includes a guide portion 18b extending radially outward from the tip portion. As is clearly understood by referring to FIGS. 2 and 4, the storage portion 14 has a projecting piece 20 (FIG. 4) in which a part of the wall defining the storage portion 14 is projected inward in the radial direction. Is formed, and similarly, it is desirable that the fitted portion 16 is formed with a protruding piece 22 in which a part of the wall defining the fitted portion 16 is projected inward in the radial direction. The projecting piece 20 is formed by forming a gate-shaped or inverted channel-shaped slit in the wall defining the storage portion 14 and projecting a portion defined by the slit inward in the radial direction. Similarly, the projecting piece 22 is formed by forming a gate-shaped or inverted channel-shaped slit in the wall defining the fitted portion 16 and projecting the portion defined by the slit inward in the radial direction. There is.

As shown in FIGS. 1 and 2, a part of the temperature detector 4 described above, in the illustrated embodiment, the front half of the coat 12 is preferably concentrically positioned in the storage portion 14 of the mounting clip member 6. A synthetic resin is filled and cured between the inner peripheral surface of the storage portion 14 and the outer peripheral surface of the coat 12, and thus the filled resin layer 24 is arranged. Then, a part of the temperature detector 4, more specifically, the outer peripheral surface of the front half portion of the coat 12 is fixed to the inner peripheral surface of the storage portion 14 of the mounting clip member 6 by the filling resin layer 24. The projecting piece 20 formed in the storage portion 14 of the mounting clip member 6 is surrounded by the filling resin layer 24, which promotes the adhesion between the storage portion 14 and the filling resin layer 24. The synthetic resin constituting the packed resin layer 24 is excellent in heat resistance, has a relatively large thermal conductivity, and has good bondability with the coat 12 of the temperature detector 4, and is particularly low in epoxy resin. It is preferably a flexible epoxy resin or a silicone resin having a viscosity and a low elasticity. As clearly illustrated in FIG. 2, the surface 24a exposed without being surrounded by the storage portion 14 of the mounting clip member 6 in the filling resin layer 24 has a radius of curvature R4 of the outer peripheral surface of the pipe 26 for which the surface temperature should be detected. It is convenient to have a concave curved surface having the same radius of curvature R6 in practice (R4 = R6). Such a concave curved surface 24a is formed by using a regulation 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 melted state. Can be done.

FIG. 6 illustrates a state in which the pipe temperature detecting device 2 as described above is attached to the outer peripheral surface of the pipe 26 for which the surface temperature should be detected. When the temperature detection device 2 is mounted on the pipe 26, the fitted portion 16 of the mounting clip member 6 is attached to the outer peripheral surface of the pipe 26, and more specifically, the tip edge and the second edge of the first portion 16a of the fitted portion 16. The gap between the tip edge of the portion 16b is positioned against the outer peripheral surface of the pipe 26, and the fitted portion 16 is forced toward the pipe 26 to fit the fitted portion 16 on the outer peripheral surface of the pipe 26. .. At this time, the fitted portion 16 is guided to the pipe 26 by the guide portions 18a and 18b. When the fitted portion 16 is fitted on the outer peripheral surface of the pipe 26, the circumferential extension length of the first portion 16a is longer than the circumferential extension length of the second portion 16b. And again, the first portion 16a is mainly due to the fact that the width of the first portion 16a is gradually reduced toward the direction away from the storage portion 14 on the downstream side when viewed in the direction away from the storage portion 14. 16a, particularly the downstream side in the direction away from the storage portion 14, is more elastically displaced or deformed than the upstream side. The protruding piece 22 formed in the fitted portion 16 locally bites into the outer peripheral surface of the pipe 26, whereby the mounting clip member 6 is sufficiently firmly mounted on the outer peripheral surface of the pipe 26.

As described above, when the mounting clip member 6 is mounted on the outer peripheral surface of the pipe 26, the first portion 16a of the fitted portion 16, particularly the downstream portion in the direction away from the storage portion 14, is elastically. It is displaced or deformed, whereby the elastic displacement or deformation of the accommodating portion 14 of the mounting clip member 6 is suppressed as much as possible, and the filled resin layer 24 can be peeled off from the inner peripheral surface of the accommodating 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 substantially the same (and also, the first (When the widths of the first portion 16a and the second portion 16b are not particularly changed), when the fitted portion 16 is fitted on the outer peripheral surface of the pipe 26, the first portion 16a and the first portion 16a of the fitted portion 16 are fitted. Both of the second portion 16b and the second portion 16b are elastically displaced or deformed substantially uniformly, and the storage portion 14 of the mounting clip member 6 is also elastically displaced or deformed accordingly, and as a result, the storage portion 14 of the storage portion 14 is displaced or deformed. The filled resin layer 24 tends to be peeled off from the inner peripheral surface. Further, in the illustrated embodiment, since the protruding piece 20 formed in the storage portion 14 is surrounded by the filling resin layer 24, the filling resin layer 24 is separated from the inner peripheral surface of the storage portion 14. Is more reliably prevented.

As is clearly understood by referring to FIG. 6, when the mounting clip member 6 is mounted on the outer peripheral surface of the pipe 26, the radius of curvature of the concave curved surface 24a of the filling 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 thermista element 6 of the pipe detector 4, and good temperature measurement sensitivity is obtained. can get.

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

Claims (10)

A temperature detector containing a thermistor element and a pair of lead wires connected to the thermistor element, a storage portion accommodating a part of the temperature detector, and a cylindrical pipe for detecting the surface temperature. In a piping temperature detection device including a mounting clip member including a fitting portion,
The accommodating portion of the mounting clip member has an arc shape extending beyond 180 degrees in the cross section, and the fitted portion of the mounting clip member extends from one end edge in the circumferential direction of the accommodating portion in the cross section. It has a first portion of the existing arc shape and a second portion of the arc shape 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 angle range of 150 to 190 degrees, and the second portion of the fitted portion of the mounting cup member extends. It extends over an angle range of 40 to 60 degrees, and between the tip edge of the first portion and the tip edge of the second portion over an angle range of 60 to 80 degrees. There is a gap,
A filled resin layer is disposed between the outer peripheral surface of a part of the temperature detector housed in the storage portion of the mounting clip member and the inner peripheral surface of the storage portion of the mounting clip member. The part of the temperature detector is fixed to the storage portion of the mounting clip member by the filling resin layer.
A piping temperature detector characterized by this. A claim that the width of the downstream side portion of the first portion of the fitted portion of the mounting clip when viewed from the storage portion is gradually reduced in the direction away from the storage portion. Item 1. The piping temperature detecting device according to item 1. The surface of the filled resin layer exposed without being surrounded by the accommodating portion of the mounting 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, claim 1 or 2. The piping 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 storage of the mounting clip member. The pipe temperature detecting device according to any one of claims 1 to 3, which is larger than the radius of curvature of the inner peripheral surface of the portion. Claimed, the tip edge of the first portion and the tip edge of the second portion of the fitted portion of the mounting clip member are each provided with a guide portion extending outward in the radial direction. The pipe temperature detecting device according to any one of 1 to 4. According to any one of claims 1 to 5, a projecting piece is formed in the accommodating portion of the mounting clip member so that a part of the wall defining the accommodating portion is projected inward in the radial direction. The described piping temperature detector. Any of claims 1 to 6, wherein a protruding piece is formed in the fitted portion of the mounting clip member so that a part of the wall defining the fitted portion is projected inward in the radial direction. The piping temperature detector described in Crab. The piping temperature detecting device according to any one of claims 1 to 7, wherein the filling resin is an epoxy resin or a silicone resin. The piping temperature detecting device according to any one of claims 1 to 8, wherein the mounting clip member is made of a thin metal plate. The temperature detector comprises a synthetic resin coating that surrounds the thermistor element and the tips of the pair of lead wires, and a part of the coating is housed in the storage portion of the mounting clip member. The pipe temperature detector according to any one of 1 to 9.

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