JP2003075031A - Sensor fixture and method for manufacturing sensor fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor fixture which raises detection accuracy of a temperature sensor and can be readily manufactured, and provide a method for manufacturing the sensor fixture. SOLUTION: The sensor fixture 1 is formed by giving a bending process to a plate material to bend it half and obtain a double structure, giving another bending process to the double structure to bend it further half and obtain a quadruple structure, and giving still another bending process to the quadruple structure to obtain a sensor holder 3 and a fixing portion 7. The fixing portion 7 has a double structure consisting of an inner piece 8 and an outer piece 9 with a gap 10 bending formed therebetween. The temperature sensor 11 is fit into the sensor holder 3, and in this state, a pipe 15 is fit into the inner piece 8 of the fixing portion 7. Thus, the temperature sensor 11 can be fixed to the side of the pipe 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor mounting tool effective for mounting a temperature sensor on a pipe for circulating a heat exchange medium of a heat exchanger such as an air conditioner and a method for manufacturing the sensor mounting tool.

[0002]

2. Description of the Related Art Generally, various temperature sensors are attached to a pipe for circulating a heat exchange medium of a heat exchanger such as an air conditioner, and a signal from the temperature sensor controls the operation of the air conditioner. ing.

In this case, the temperature sensor is indirectly attached to the straight or bent portion of the pipe of the heat exchanger while the pipe is brazed.

[0004]

However, the method of indirectly mounting by brazing requires a brazing work, and thus the mounting is troublesome. Moreover, since the pipe is indirectly contacted with the pipe, the pipe is influenced by the surrounding air, and a temperature detection error increases, which makes it difficult to accurately detect the temperature on the pipe side.

On the other hand, in order to solve the above problems,
A method of attaching a temperature sensor to a pipe of a heat exchanger using a fixture has been proposed, one example of which is disclosed in JP-A 2000-95.
No. 45 publication.

As shown in FIG. 5, this sensor mount 21 has a semi-circular arc-shaped semi-circular arc portion 22 at one end and an inner cut-and-raised portion 2.
3 is provided, a semi-arcuate pipe semi-circular arc mounting portion 24 that bends in the same direction as the semi-circular arc portion 22 is provided at the other end, and a bending piece 25 that bends outward is provided at the tip of the pipe semi-circular arc attachment portion It is a thing.

Then, the sensor mount 2 having such a configuration
In order to attach the temperature sensor 27 to the pipe 30 of the heat exchanger using No. 1, the temperature sensor 27 is fitted in the semi-circular arc portion 22 and the temperature between the inner surface of the semi-circular arc portion 22 and the inner cut and raised portion 23 is increased. The sensor 27 is held, and in this state, the pipe 30 is pushed between the temperature sensor 27 and the bending piece 25 to fit the pipe 30 to the inner surface side of the pipe semi-circular arc mounting portion 24.

In this way, the temperature sensor 27 can be attached to the pipe 30 of the heat exchanger via the sensor attachment 21, and the temperature sensor 27 and the pipe 30 of the heat exchanger can be brought into close contact with each other. It is a thing.

However, in the sensor mounting member 21 having the above-mentioned structure, the temperature sensor 27 can be mounted easily because the work such as brazing is unnecessary.
Since only part of the temperature sensor 27 is in contact with the pipe 30 of the heat exchanger, the part of the temperature sensor 37 that is not in contact with the pipe 30 is affected by the ambient air, which causes an error in temperature detection. It becomes large, and it becomes difficult to accurately detect the temperature on the pipe 30 side.

The present invention has been made in view of the above-mentioned conventional problems, is easy to install, is not affected by ambient air, has a very small temperature detection error, and has a small pipe side. An object of the present invention is to provide a sensor mounting tool that can accurately detect the temperature of the.

[0011]

In order to solve the above problems, the present invention employs the following means. The invention according to claim 1 is a sensor mounting tool for mounting a temperature sensor on a pipe through which a heat exchange medium of a heat exchanger is circulated, which holds the temperature sensor and contacts substantially the entire detection portion of the temperature sensor. And a mounting portion that is integrally formed with the sensor holding portion and is detachable from the pipe, and the mounting portion has a double structure having a gap. According to the sensor fitting of the present invention, the heat on the pipe side of the heat exchanger is transmitted to the temperature sensor via the mounting portion and the sensor holding portion, and the temperature on the pipe side is detected by the temperature sensor. Become. In this case, the heat on the pipe side transmitted from the mounting portion to the sensor holding portion is transmitted to almost the entire detection portion of the temperature sensor, and the temperature on the pipe side is detected. Furthermore, since the mounting portion has a double structure with a gap, the gap functions as a heat insulator, and heat from the pipe side is efficiently transferred from the mounting portion to the sensor holding portion side. Become.

The invention according to claim 2 is the sensor mounting tool according to claim 1, wherein the mounting portion has a double structure consisting of an inner piece and an outer piece, and a gap is formed between both pieces. It is characterized by According to the sensor fixture according to the present invention,
The gap between the inner piece and the outer piece of the mounting portion exerts a heat insulating function, and the heat of the pipe side is efficiently transmitted from the mounting portion to the sensor holding portion side.

The invention according to claim 3 is the sensor mounting tool according to claim 1 or 2, wherein the tip end portion of the sensor holding portion is closed. According to the sensor attachment of the present invention, the temperature sensor can be attached to the sensor holder simply by inserting the temperature sensor into the sensor holder, so that the temperature sensor can be easily attached to the sensor holder. Further, the mounting in this case may be fixed with a synthetic resin or the like.

The invention according to claim 4 is the sensor mounting tool according to claim 1, 2 or 3, wherein the temperature sensor is formed in a rod shape, and the sensor holding portion and the mounting portion are long. It is formed to have a width that holds a region in the depth direction, and the widths of the sensor holding portion and the mounting portion are substantially the same. According to the sensor fitting of the present invention, the heat on the pipe side is linearly transferred to the detection portion of the temperature sensor via the mounting portion and the sensor holding portion,
The temperature on the pipe side will be detected.

According to a fifth aspect of the present invention, a plate-shaped material is subjected to a bending process so as to be bent in half, and is double-formed, and a double-processed material is subjected to a bending process to be halved. A second step of bending and forming a quadruple, and a third step of forming a sensor holding portion for holding the temperature sensor by plastically deforming the quadruple formed material by press working and a detachable attachment portion for the pipe And a process. According to the method of manufacturing the sensor mounting member of the present invention, the sensor holding portion and the mounting portion are formed by performing the first step, the second step, and the third step on the plate-shaped material. Become.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a sensor attachment according to the present invention.
In FIG. 4, the sensor fixture 1 shown in this embodiment
Is applied when the temperature sensor 11 is attached to the pipe 15 through which the heat exchange medium of the heat exchanger such as an air conditioner is circulated, and the sensor holding portion 3 that holds the temperature sensor 11 and the pipe of the heat exchanger. The mounting part 7 is detachably mounted on the mounting part 15.

The sensor mount 1 is made of a material such as aluminum, copper, brass, and stainless steel, which is a thin plate having a substantially rectangular shape.
(See FIG. 1), the sensor holding portion 3 and the mounting portion 7 are integrally formed by bending the material 2.

Specifically, it is formed through the following three steps (1) to (3). (1) As shown in FIG. 1, a substantially rectangular thin plate made of a metal such as aluminum, copper, brass, and stainless is used as a material 2 and the center line of the material 2 is a fold line 2a as shown in FIG. As the first step, fold in half and form double. (2) A second step in which the double-formed material 2 is folded in half with the center line as the folding line 2b to form a four-fold structure, as shown in FIG. (3) The quadruple formed material 2 is plastically deformed by pressing to form a substantially cylindrical sensor holding portion 3 having a closed tip at a portion located on the folding line 2b side as shown in FIG. In addition, the portion that is continuous with the sensor holding portion 3 is substantially U-shaped.
A third step of forming the mounting portion 7 having a shape. Then, by going through such three steps, the sensor mounting tool 1 including the substantially cylindrical sensor holding portion 3 having a closed tip and the substantially U-shaped mounting portion 7 is formed. The end of the mounting portion 7 is appropriately cut for shaping.

In this case, the mounting portion 7 is formed in a double structure consisting of the inner piece 8 and the outer piece 9 located outside thereof.
Between the two pieces 8 and 9, a substantially U-shaped space 10 with a closed tip is formed.
Is formed.

The boundary between the sensor holding portion 3 and the mounting portion 7 is
It may be in a state of being bent, but may be integrally joined by brazing, caulking, screwing or the like.

A temperature sensor 11 is mounted inside the inner cylinder 4 of the sensor holder 3 of the sensor mount 1 constructed as described above, and a signal from the temperature sensor 11 controls the operation of the heat exchanger. It is like this.

The temperature sensor 11 is a round bar-shaped sensor body 1.
2 and a lead wire 13 connected to the sensor body 12. In this case, although not shown, the sensor body 12 is fitted into the inside of a protection cap made of metal such as aluminum, copper, brass, stainless steel, etc., which has a substantially cylindrical shape with a closed tip, if necessary. Is also good. When the protective cap is used, the sensor body 12 is inserted inside the protective cap, and then the opening of the protective cap is filled with a filler such as a synthetic resin adhesive. The opening of the protective cap is closed by this filler, the sensor body 12 and the protective cap are integrally joined, and the sensor body 12 can be prevented from coming out of the protective cap.

To mount the temperature sensor 11 on the sensor mount 1, the temperature sensor 11 is inserted into the inside of the sensor holding portion 3, and a filler is filled between the temperature sensor 11 and the sensor holding portion 3. Let it solidify. In this case, the outer diameter of the temperature sensor 11 and the inner diameter of the sensor holder 3 may be adjusted without using a filler so that the temperature sensor 11 is tightly fitted to the sensor holder 3. .

A straight part or a bent part of the pipe 15 for circulating the heat exchange medium of the heat exchanger is fitted inside the inner piece 8 of the mounting part 7. In this case, the mounting part 7
The radius of curvature of the bottom of the inner piece 8 of the
Is set to be substantially the same as the radius of curvature of the straight line portion or the curved line portion. As a result, the straight portion or the bent portion of the pipe 15 can be tightly fitted inside the inner piece 8 of the mounting portion 7, so that the mounting portion 7 can be prevented from coming off the pipe 15. The thickness of the inner piece 8 of the mounting portion 7 is equal to that of the pipe 1
It may be set thicker than the wall thickness of 5. As a result, the heat transfer coefficient from the pipe 15 to the sensor mount 1 can be increased.

Although not shown, the tips of the inner piece 8 and the outer piece 9 constituting the mounting portion 7 may be bent outward, and the inner surface of the bent portion may be formed into a tapered surface or a rounded surface. . With such a configuration, it is possible to prevent the pipe 15 from being scratched at the tip of the opening of the mounting portion 7 when the pipe 15 is inserted into the mounting portion 7.

Since the temperature sensor 11 is formed in a rod shape, the sensor holding portion 3 and the mounting portion 7 are formed with a width that holds the region of the temperature sensor 11 in the longitudinal direction,
The widths of the sensor holding portion 3 and the mounting portion 7 are formed to be substantially the same. As a result, the heat on the pipe 15 side can be linearly transferred to the detection part of the temperature sensor 11 via the mounting part 7 and the sensor holding part 3, so that the loss at the time of heat transfer can be made extremely small. Is.

Then, the temperature sensor 11 is held in the sensor holding portion 3 of the sensor mounting tool 1 constructed as described above, and in this state, the pipe 1 of the heat exchanger is placed inside the inner piece 8 of the mounting portion 7.
By fitting the straight part or the bent part of No. 5, the temperature sensor 11 is attached to the straight part or the bent part of the pipe 15 of the heat exchanger, whereby the temperature on the pipe 15 side of the heat exchanger can be detected. It will be possible.

In the sensor mount 1 according to the present embodiment configured as described above, the heat on the pipe 15 side of the heat exchanger is transferred to the temperature sensor 11 via the mount 7 and the sensor holder 3. Will be done. In this case, the temperature sensor 11 is almost entirely in contact with the inside of the sensor holding portion 3 and there is almost no portion in contact with air. Therefore, contact with air causes a temperature detection error. Therefore, the temperature on the pipe 15 side can be accurately detected.

Further, a space 10 is formed between the inner piece 8 and the outer piece 9 of the mounting portion 7, and an air layer in the space 10 can prevent heat of the inner piece 8 from escaping to the outside. Therefore, the temperature on the pipe 15 side can be detected more accurately.

Further, since the heat on the pipe 15 side is linearly transferred to the detecting portion of the temperature sensor 11 via the mounting portion 7 and the sensor holding portion 3 which are formed to have substantially the same width, The transmission loss can be made extremely small, and the temperature detection accuracy can be greatly improved.

Further, the sensor holding portion 3 and the mounting portion 7 are
Since one thin metal plate is used as the material 2 and is bent to be formed into a predetermined shape, their manufacture is facilitated.

Further, in order to attach the temperature sensor 11 to the straight portion or the bent portion of the pipe 15 of the heat exchanger, the temperature sensor 11 is held inside the sensor holding portion 3 and is placed inside the inner piece 8 of the attaching portion 7. Since it suffices to fit the straight portion or the bent portion of the pipe 15, it is not necessary to directly attach the temperature sensor 11 to the pipe 15 side by brazing or the like, and the attachment of the temperature sensor 11 becomes very simple.

[0033]

As described above, according to the present invention, the temperature sensor is held in the sensor holding portion, and in this state, the attachment portion is attached to the straight portion or the bent portion of the pipe of the heat exchanger, so that the temperature Since the sensor can be attached to the pipe of the heat exchanger, work such as brazing is not required to attach the temperature sensor, and the temperature sensor can be attached very easily. Further, the heat on the pipe side of the heat exchanger is transmitted to the temperature sensor via the mounting portion and the sensor holding portion, and the temperature on the pipe side is detected by the temperature sensor. In this case, the temperature sensor is almost entirely in contact with the sensor holder, and there is almost no part in contact with air. It can be greatly increased.
Furthermore, the mounting part has a double structure with a void, and the air layer in the void can prevent the heat of the mounting part from escaping to the outside, so the heat of the pipe side can be efficiently transmitted to the temperature sensor side. Therefore, the temperature detection accuracy of the temperature sensor can be further improved. Further, the heat on the pipe side can be linearly transferred to the detection part of the temperature sensor through the mounting part and the sensor holding part which are formed to have substantially the same width, so that the loss in heat transfer is extremely small. Therefore, the temperature on the pipe side can be detected with high accuracy. Furthermore, since the sensor holding portion and the mounting portion are formed into a predetermined shape by bending one sheet of material, they can be easily manufactured. Furthermore, since the sensor holding portion has a structure in which the tip is closed, the temperature sensor can be directly inserted into the sensor holding portion without using a protective cap. Easy to put on.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a material used for a sensor attachment and a method for manufacturing the sensor attachment according to the present invention.

FIG. 2 is an explanatory diagram showing a first step of the method for manufacturing the sensor fixture.

FIG. 3 is an explanatory diagram showing a second step of the method for manufacturing the sensor fixture.

FIG. 4 is a perspective view showing an embodiment of a sensor attachment. It is explanatory drawing which showed the 3rd process of the manufacturing method of a sensor attachment.

FIG. 5 is an explanatory view showing an example of a conventional sensor attachment.

[Explanation of symbols]

1 ... Sensor attachment 2 ... Material 3 ... Sensor holder 7 ... Mounting part 8 ... Inside piece 9 ... Outer piece 10 ... void 11 ... Temperature sensor 15 ... pipe

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sakae Mori             Saitama Prefecture Chichibu-gun Yokose-cho 2270 Yokoze             Ryo Materials Co., Ltd. Ceramics Factory Den             Child Device Development Center

Claims (5)

[Claims] 1. A sensor attachment for attaching a temperature sensor to a pipe for circulating a heat exchange medium of a heat exchanger, the sensor attachment holding the temperature sensor and contacting substantially the entire detection portion of the temperature sensor. And a mounting portion that is formed integrally with the sensor holding portion and is detachable from the pipe, and the mounting portion has a double structure having a gap. 2. The sensor mount according to claim 1, wherein:
The sensor mounting member, wherein the mounting portion has a double structure including an inner piece and an outer piece, and a gap is formed between the both pieces. 3. The sensor mount according to claim 1 or 2, wherein a tip end portion of the sensor holding portion is closed. 4. The sensor mount according to claim 1, 2 or 3, wherein the temperature sensor is formed in a rod shape, and the sensor holding portion and the mounting portion hold a region in the lengthwise direction of the temperature sensor. And a width of the sensor holding portion and that of the mounting portion are substantially the same. 5. A first step of bending a plate-shaped material to fold it in half to form a double shape, and a bending process to a double-formed material to fold it in half to form a quadruple shape. And a third step of forming a sensor holding portion for holding the temperature sensor by plastically deforming the quadruple formed material by press working and a detachable mounting portion for the pipe. A method for manufacturing a characteristic sensor fixture.