JP4239261B2 - Temperature sensor mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is suitable for attaching a temperature sensing element such as a thermistor to a pipe that needs to detect temperature, such as a discharge pipe of a compressor that constitutes an air conditioner or a refrigerant pipe of a heat exchanger. The present invention relates to an element mounting structure.
[0002]
[Prior art]
FIG. 5 is a front view showing a mounting structure according to the first prior art. As shown in the figure, a discharge pipe 33 is connected to the compressor discharge pipe 31 via a pipe joint 32. A thermistor mounting pipe 34 is fixed to the curved portion of the discharge pipe 33 by brazing, for example. The thermistor 35 is inserted into the thermistor mounting pipe 34 and attached.
[0003]
In this mounting structure, the thermistor 35 needs to be removed for inspection, replacement, etc. during maintenance or failure of the air conditioner, so that the thermistor mounting pipe 34 and the thermistor 35 are easily attached and detached. The thermistor mounting spring 36 is interposed between the thermistor mounting pipe 34 and the thermistor 35 in order to prevent the thermistor 35 from coming off due to the vibration of the compressor or the like. Therefore, in the first prior art, the thermistor 35 can be reliably and accurately attached to the place where the temperature is desired to be detected, and the thermistor 35 can be easily attached and detached.
[0004]
However, the first prior art has a problem that the number of parts is large and the cost is high, and that a lot of work is required because brazing is required. Further, when changing the mounting position, it is necessary to reattach the thermistor mounting pipe 34 or a new thermistor mounting pipe, which is disadvantageous in terms of workability and economy.
[0005]
Therefore, from the viewpoint of cost reduction, the second conventional example shown in FIG. 6 is implemented. FIG. 6A is a front view of a mounting structure according to the second prior art, and FIG. 6B is a schematic sectional view of the mounting structure. In this mounting structure, only one mounting bracket 41 is used. The mounting bracket 41 is a so-called clip-shaped component, and has a thermistor insertion portion 41a and a piping insertion portion 41b, and is attached by contacting the thermistor 42 to the piping 43 using the elastic force of the mounting bracket 41 itself. It is. When attaching the thermistor 42, first, the thermistor 42 is inserted into the thermistor insertion part 41a of the mounting bracket 41, and then the pipe 43 is inserted into the pipe insertion part 41b, and the pipe 43 and the thermistor 42 are arranged in contact with each other. And attach.
[0006]
The second prior art has the advantage that only one component is required, so that the cost can be reduced as compared with the first prior art, and the mounting operation is easy and does not require much labor. In addition, the removal can be performed simply by expanding the mounting bracket 41 against the elastic force, so that the workability at the time of maintenance or failure is improved and the mounting position can be easily and inexpensively changed. it can.
[0007]
However, in the above mounting structure, if the mounting and removal are repeated many times, the elastic force of the mounting bracket 41 becomes weak, so that the thermistor 42 is separated from the pipe 43, the mounting position is shifted, and normal temperature detection is performed. There is a problem that it cannot be done.
[0008]
The present invention has been made to solve the above-described conventional drawbacks, and the purpose thereof is that the temperature sensing element may be separated from the pipe or displaced even if the temperature sensing element such as the thermistor is repeatedly attached and detached. It is an object of the present invention to provide a temperature sensing element mounting structure that enables normal temperature detection without the need to do so.
[0009]
[Means for Solving the Problems]
Accordingly, the temperature sensing element mounting structure according to claim 1 is a mounting structure in which the temperature sensing element 4 is attached to a pipe 3 such as a discharge pipe of a compressor, and a pair of sandwiching pieces 6 whose tip side is elastically pressure-bonded to the pipe 3. , 7 are connected to each other by a connecting portion 8 and the connecting portion 8 of the attaching device 5 has two cut-and-raised portions along the insertion direction 11 of the temperature sensitive element 4. 9 and 10, the two cut-and-raised portions 9 and 10 are cut inward so that the tip portions 9 a and 10 a face each other, and the temperature sensing element 4 has one cut-and-raised portion 9 facing outward. And is inserted until the tip 4a contacts the other cut-and-raised portion 10, and the cut-and-raised portion 9 on the rear side in the insertion direction functions as the spring, and the inserted temperature sensing element is connected to the pipe (3). Attach to the front side, Partially 10 is characterized in that functions as a stopper to position the insertion direction 11.
[0010]
In the temperature sensing element mounting structure according to claim 1, the fixture 5 is attached to the pipe 3 by elastically pressing the pair of sandwiching pieces 6, 7. The temperature sensing element 4 is connected to the pipe 3. 8 and is attached to the pipe 3 by being biased by a spring 9 provided in the fixture 5. That is, the force for fixing the fixture 5 to the pipe 3 and the force for pressing and fixing the temperature sensitive element 4 to the pipe 3 act separately. Therefore, even when the attachment and detachment of the attachment 5 for inspection / repair of the temperature sensing element 4 is repeated many times, even if the crimping force of the sandwiching pieces 6 and 7 is weakened, the biasing force of the spring 9 Since the temperature sensing element 4 can be pressed against the pipe 3, the temperature sensing element 4 is prevented from being separated from or displaced from the detection target portion, and normal temperature detection is always possible. Moreover, since it attaches only with the fixture 5, the change of an attachment position can also be performed easily. Further, the cut-and-raised portion 10 on the front side in the insertion direction functions as a stopper, and the temperature-sensitive element 4 is positioned on the front side in the insertion direction, so that the temperature-sensitive element 4 is not pushed in excessively during installation. It can be installed at any position. In addition, when attached to a vibrating pipe 3 such as a discharge pipe of a compressor, the provision of a stopper prevents the temperature sensitive element 4 from moving forward in the insertion direction and falling off. The temperature sensitive element 4 can be held at a proper mounting position. This allows normal temperature detection.
[0011]
Further, since the two cut-and-raised portions 9 and 10 are formed symmetrically, when attaching the fixture 5 to the pipe 3, it is possible to use either direction without worrying about the positional relationship between the cut-and-raised portions 9 and 10. However, it can be attached, improving workability. Also, if the biasing force of one cut-and-raised portion 9 as a spring becomes weak, it can be attached in the opposite direction, and the other cut-and-raised portion 10 used as a stopper can be used as a spring, so Since a force can be applied, an appropriate attachment state can be maintained over a long period of time without replacing the attachment 5.
[0012]
Further, in the temperature sensor mounting structure of claim 2 , pipe clamping portions (6a) and (7a) are formed on the front end side of the clamping pieces (6) and (7). Is formed so as to protrude in an approximately V shape and to protrude outward, and the inner surfaces (6b) and (7b) form a substantially V-shaped sandwiching surface.
[0013]
In the temperature sensing element mounting structure according to claim 2, since the pipe clamping piece has a V-shaped cross section, even one type of mounting tool can be adapted to pipes having different outer diameter dimensions, Dimensional accuracy is not required, and it has excellent versatility.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, a specific embodiment of the temperature sensing element mounting structure of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a part of the mounting structure according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view of the mounting structure.
[0015]
A discharge pipe 3 is connected to the compressor discharge pipe 1 via a pipe joint 2. The thermistor 4 which is a temperature sensitive element is attached to the discharge pipe 3 by an attachment 5. As shown in FIG. 3, the fixture 5 is formed of a metal so that the base ends of the pair of sandwiching pieces 6 and 7 are connected by a substantially flat connecting portion 8 and the cross section is substantially U-shaped. Or a material having a certain elasticity such as a synthetic resin.
[0016]
On the front end side of the sandwiching pieces 6 and 7, pipe sandwiching portions 6a and 7a are formed. The pipe clamping portions 6a and 7a are formed so that the cross section is substantially V-shaped and projecting outward, and the inner surfaces 6b and 7b are substantially V-shaped clamping surfaces. The sandwiching pieces 6 and 7 are formed so that the closest distance between the sandwiching surfaces 6 b and 7 b is smaller than the outer diameter of the discharge pipe 3 in a natural state (a state where the sandwiching pieces 6 and 7 are not attached to the discharge pipe 3). ing. Accordingly, when the sandwiching pieces 6 and 7 are separated from each other, a restoring force (elastic force) for returning to the original position is generated, so that the fixture 5 uses the elastic force to remove the outside of the discharge pipe 3. Attached to the surface (see FIG. 4). In addition, the front ends 6c and 7c of the sandwiching pieces 6 and 7 are bent outward so that the operator can easily grasp the sandwiching pieces 6 and 7 when they are separated from each other. On the other hand, the distance between the proximal ends of the sandwiching pieces 6 and 7 is formed to be approximately the same as the outer diameter of the thermistor 4. Then, as shown in FIG. 4, the thermistor 4 is inserted between the discharge pipe 3 and the connecting portion 8 from the insertion direction indicated by the arrow 11.
[0017]
On the other hand, two cut-and-raised portions 9 and 10 are formed in the connecting portion 8 along the longitudinal direction (insertion direction 11 of the thermistor 4). The two cut-and-raised portions 9 and 10 are cut and raised inward so that the tip portions 9a and 10a are close to each other and face each other. As shown in FIG. 1, the thermistor 4 is inserted until one cut-and-raised portion 9 is pushed outward, and the tip 4 a is in contact with the tip 10 a of the other cut-and-raised portion 10. Accordingly, the cut-and-raised portion 9 on the rear side in the insertion direction functions as a spring, and the thermistor 4 is attached by being biased toward the discharge pipe 3. On the other hand, the cut-and-raised portion 10 on the front side in the insertion direction functions as a stopper, and positions the front end portion 4a of the thermistor 4 on the front side in the insertion direction.
[0018]
As described above, according to the present embodiment, the attachment 5 is attached to the discharge pipe 3 by elastically pressing the pair of sandwich pieces 6 and 7, and the thermistor 4 is connected to the discharge pipe 3 and the connecting portion 8. And is urged and attached to the discharge pipe 3 by a spring (cut-raised portion 9) formed in the connecting portion 8. That is, the force for fixing the fixture 5 to the discharge pipe 3 and the force for pressing and fixing the thermistor 4 to the discharge pipe 3 act separately. Accordingly, even when the attachment and detachment of the attachment 5 for inspection / repair of the thermistor 4 is repeated many times, the thermistor 4 is urged by the urging force of the spring 9 even if the crimping force of the sandwiching pieces 6 and 7 is weakened. Since the thermistor 4 can be prevented from moving away from or deviating from the detection target part, normal temperature detection can always be performed. Further, since the inner surface of the sandwiching pieces 6 and 7 on the connecting portion 8 side is in contact with the thermistor 4, so-called lateral displacement can be prevented. Furthermore, since it attaches only with the fixture 5, the change of the attachment position of the thermistor 4 can also be performed easily.
[0019]
Further, since the spring 9 and the stopper 10 are formed by cutting and raising the connecting portion 8, the fixture 5 can be manufactured inexpensively and easily. Further, since the two cut-and-raised portions 9 and 10 are formed symmetrically, when attaching the fixture 5 to the discharge pipe 3, whichever of the raised-and-raised portions 9 and 10 is concerned, Since it can be attached in any orientation, workability is improved.
[0020]
The cut-and-raised portion 10 on the front side in the insertion direction functions as a stopper, and the thermistor 4 is positioned on the front side in the insertion direction. be able to. Even when the discharge pipe 3 vibrates, the provision of the stopper 10 prevents the thermistor 4 from moving forward in the insertion direction and falling off, and the thermistor 4 can be held at an appropriate mounting position. it can. This allows normal temperature detection.
[0021]
Furthermore, when the urging force of the spring 9 that is one cut-and-raised part is weakened, if the fixture 5 is attached in the opposite direction and the other cut-and-raised part 10 used as a stopper is used as a spring, Since a sufficient urging force can be applied, an appropriate attachment state can be maintained over a long period of time without replacing the attachment 5.
[0022]
When attaching the thermistor 4, the thermistor 4 may be first inserted into the attachment 5 and then attached to the discharge pipe 3. However, the thermistor 4 is locked to the attachment 5. Since the thermistor 4 may come off when being attached to the discharge pipe 3, the thermistor 4 is inserted after the attachment 5 is first attached to the discharge pipe 3 as in the present embodiment. However, it is easy to work.
[0023]
Further, the sandwiching surfaces 6b and 7b of the sandwiching pieces 6 and 7 may be formed in an arc shape along the outer periphery of the discharge pipe 3, but in order to accurately form the sandwiching surfaces 6b and 7b along the outer periphery of the discharge pipe 3. High dimensional accuracy is required. Moreover, a separate fixture must be manufactured for every different outer diameter, and versatility will be inferior. On the other hand, if it is V-shaped like this embodiment, even if it is one type of fixture, it can be adapted to pipes with different outer diameters, so high dimensional accuracy is not necessary and versatility. Also excellent.
[0024]
Furthermore, although the case where the present embodiment is applied to the discharge pipe 3 of the compressor has been described, it is needless to say that the present invention can be similarly applied to a pipe that requires temperature detection, such as a refrigerant pipe of a heat exchanger.
[0025]
【The invention's effect】
As described above, according to the temperature sensing element mounting structure of claim 1, the force for fixing the fixture to the pipe and the force for pressing and fixing the temperature sensing element to the pipe act separately. As a result, even when the attachment and detachment of the fixture is repeated, the temperature-sensitive element can be pressed against the pipe by the urging force of the spring even when the pressure-bonding force of the clamping piece is weakened. As a result, the temperature sensing element is prevented from moving away from or deviating from the detection target part, and normal temperature detection is always possible. In addition, the attachment position can be easily changed. Furthermore, by providing a stopper, the temperature sensing element can be attached to an appropriate position, and the temperature sensing element can be held at an appropriate position by preventing it from moving or falling off due to vibration of the piping. be able to. This allows normal temperature detection.
[0026]
Moreover, when attaching a fixture to piping, since it can attach in either direction, without worrying about the positional relationship of two cut-and-raised parts, workability | operativity improves. Furthermore, when the biasing force as a spring of one cut-and-raised part is weakened, a sufficient biasing force can be obtained by attaching the other cut-and-raised part used as a stopper as a spring. Since it can be made to act, an appropriate attachment state can be maintained over a long period of time without replacing the attachment.
[0027]
Further, according to the temperature sensing element mounting structure of claim 2, since the cross-section of the pipe clamping piece is V-shaped, even one type of fitting can be adapted to pipes having different outer diameters. Therefore, high dimensional accuracy is not required and versatility is excellent.
[Brief description of the drawings]
FIG. 1 is a front view showing a thermistor mounting structure according to an embodiment of the present invention with a part cut away.
FIG. 2 is a schematic cross-sectional view of the mounting structure.
FIG. 3 is a perspective view of a fixture used in the mounting structure.
FIG. 4 is a front view for explaining a method for attaching the thermistor.
FIG. 5 is a front view showing a first prior art.
6A and 6B show a second prior art, in which FIG. 6A is a front view thereof and FIG. 6B is a schematic cross-sectional view thereof.
[Explanation of symbols]
3 Discharge pipe 4 Thermistor 5 Mounting tool 6 Clamping piece 7 Clamping piece 8 Connecting part 9 Cut-and-raised part 9a Tip part 10 Cut-and-raised part 10a Tip part 11 Arrow (insertion direction)

Claims (2)

In the mounting structure for attaching the temperature sensing element (4) to the pipe (3) such as the discharge pipe of the compressor, each of the pair of sandwiching pieces (6) (7) whose tip side is elastically pressure-bonded to the pipe (3) It has the fixture (5) which connects a base end side with a connection part (8), and the insertion direction (11) of the said thermosensitive element (4) in the said connection part (8) of this attachment (5 ). The two cut-and-raised portions (9) and (10) are formed along the two, and the two cut-and-raised portions (9) and (10) are cut and raised inward so that the tips (9a) and (10a) face each other. The temperature sensing element (4) inserted between the pipe (3) and the connecting part (8) pushes one cut-and-raised part (9) outward and the tip (4a) is cut off the other. It is inserted until it comes into contact with the raised part (10), and the cut-and-raised part (9) on the rear side in the insertion direction functions as a spring. While mounting the the temperature sensing element is urged in the pipe (3), sensitive cut and raised portions of the inserting direction front side (10), characterized in that the functions as a stopper for positioning the insertion direction (11) Temperature element mounting structure. Pipe sandwiching portions (6a) and (7a) are formed at the front end side of the sandwiching pieces (6) and (7). The temperature-sensitive element mounting structure according to claim 1, wherein the inner surfaces (6b) and (7b) are substantially V-shaped clamping surfaces.

Images