JP2004020167A - Sensor mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor mounting structure mounting a sensor without damaging a sensor assembly and precisely positioning a sensor body in a targeted position. <P>SOLUTION: A bracket 10 for mounting the sensor assembly 20 is disposed with a sensor retainer part 12 supporting the sensor body 21 in the tip of a rod part 11 and a mounting pedestal part 13 grasping a harness 22 covered with a protection tube 23 is disposed in the rear end of the rod part 11. The sensor retainer part 12 is formed with a groove 121 for inserting the harness 22 connected to the sensor body 21. The mounting pedestal part 13 is halved, openably/closably formed, and formed with an insertion hole 131 for inserting the harness 22 covered with the protection tube 23 in its inside, and when the mounting pedestal part 13 is closed, the protection tube 23 is clamped by a lock claw 133. The bracket 10 is mounted on a unit case 5 so that the sensor body 21 is disposed near an evaporator 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sensor mounting structure for detecting a temperature at which heat is exchanged in a heat exchanger constituting a refrigeration cycle.
[0002]
[Prior art]
In general, when a refrigerant forms a refrigeration cycle through a condenser, an expansion / expansion valve, an evaporator, and a compressor, the temperature of air ejected into the room from the evaporator is detected by a temperature sensor. The control is performed by performing the ON / OFF operation of the magnet clutch serving as the protection device. Conventionally, the sensor is mounted so as to be inserted into the fin of the evaporator, but since heat exchange is hindered around the fin where the sensor is mounted, the sensor is mounted via a bracket to a unit case incorporating the evaporator. It has become.
[0003]
On the other hand, a harness as a lead wire is connected to the sensor, and the harness is covered by a protective tube. As shown in FIG. 6, a conventional mounting structure for mounting such a sensor on a unit case supports a sensor body 21 disposed at a tip of a harness 22 by projecting a part of the sensor body 21 at a tip of the harness 22. Bracket 30 is arranged. At the rear of the bracket 30, a mounting pedestal 33 to be inserted into a mounting hole 36 formed in the unit case 5 is arranged. After the sensor body 21 is inserted through the mounting hole 36 into the unit case 35, the mounting pedestal 33 is attached to the unit case 35. When inserted into the mounting hole 36 of the case 35, the protective tube 23 covering the harness 22 of the sensor main body 21 was mounted so as to be sandwiched between the unit case 35. As a result, the sensor body 21 can be disposed on the indoor side of the fin without interfering with the fin, thereby preventing the heat exchange action from being hindered.
[0004]
[Problems to be solved by the invention]
However, in the conventional sensor mounting structure, when mounting the mounting base 33 of the bracket 30 to the mounting hole 36 of the unit case 35, the mounting is performed while sandwiching the protection tube 23. Since this work is performed manually, there is a possibility that the mounting pedestal 33 may be forcibly mounted, which may cause damage to the protection tube 23 and eventually damage the harness 22, which may cause the temperature of the sensor body 21 to be detected. It has an adverse effect. Also, since the mounting base 33 and the unit case 35 are fixed by a key member for positioning the sensor main body 21 in the rotation direction, forcible mounting of the mounting base 33 also damages the key. There is a fear that the parts must be replaced.
[0005]
Moreover, mounting the mounting pedestal 33 with the mounting pedestal 33 sandwiched in the mounting hole 36 of the unit case 35 is because the position of the axis of the harness 22 is eccentric from the axis of the mounting pedestal 33 at the position of the mounting hole 36. When the bracket 30 is mounted on the unit case 35, the axis of the harness 22 is attached to be inclined with respect to the horizontal direction. That is, the sensor main body 21 is turned forward and cannot be arranged at an accurate position of the target evaporator, and it is difficult to detect the lowest cooled temperature.
[0006]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and by preventing the protective tube / harness from being damaged by grasping the protective tube covering the harness without difficulty and disposing the sensor at an accurate position, the target position is improved. It is an object of the present invention to provide a sensor mounting structure capable of accurately detecting a temperature in a sensor.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the sensor mounting structure according to the present invention is configured such that the sensor mounting member holds the sensor near the heat exchanger in the sensor mounting member and prevents the sensor from being displaced. And a displacement prevention means. A groove for holding the sensor is provided on the holding means, and a sensor mounting member serving as a displacement prevention means is provided on the case body by providing a lock claw for gripping the sensor on a base formed to be openable and closable. , The sensor is arranged near the heat exchanger.
[0008]
When mounting the sensor on the sensor mounting member, the tip of the sensor is inserted into the groove, and the rear part of the sensor is inserted and held in the pedestal. At this time, since the pedestal is formed so as to be openable and closable, the sensor is inserted in an open state and then closed, whereby the lock claw grips the sensor. In this state, the pedestal is fitted into the mounting hole by passing through the mounting hole of the case body from the tip of the sensor. Since the sensor itself is gripped by the lock claw, when the pedestal is fitted into the mounting hole, no pressure is generated on the sensor itself due to the fitting. Therefore, the sensor can be attached to a predetermined position without damaging the sensor. Moreover, the sensor is guided by the groove and held without displacement.
[0009]
According to the second aspect of the present invention, since the mounting hole is formed in a tapered shape having a small diameter toward the inside of the case, the pedestal of the sensor mounting member extends along the tapered surface of the mounting hole. As a result, the pedestal can be easily mounted in the mounting hole without forcibly fitting the pedestal.
[0010]
According to the third aspect of the present invention, since the axis of the groove and the pedestal are arranged on the same horizontal line, the sensor is arranged on the horizontal line, so that the sensor can be used as a detection portion of the sensor. Can be accurately arranged at a predetermined position, and a target temperature can be detected.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0012]
The sensor mounting structure of the embodiment describes the mounting structure of a sensor that detects the temperature of air ejected from an evaporator constituting a refrigeration cycle as an air conditioner of an automobile, but is not limited to this. For example, the present invention can be applied to a home air conditioner.
[0013]
As shown in FIG. 1, the sensor assembly 20 includes a detecting unit (hereinafter, referred to as a sensor main body) 21 for detecting a temperature, a harness 22 as a lead wire connected to the sensor main body 21, and a sensor for protecting the harness 22. And a protective tube 23 that covers the periphery of the harness 22. The sensor assembly 20 is mounted on a sensor mounting member (hereinafter, referred to as a bracket) 10 in a unit case 5 containing the evaporator 3. The unit case 5 is arranged in the front panel of the automobile, and the heat exchanged air is blown out from the evaporator 3 incorporated in the unit case 5 toward the indoor side. One mounting hole 6 for mounting the sensor assembly 20 is formed in the side surface of the unit case 5. The mounting hole 6 is formed in a tapered surface having a smaller diameter toward the inside of the unit case 5, and is formed in the unit case 5 so that an axis of the mounting hole 6 reaches one fin portion of the evaporator 5.
[0014]
The bracket 10 has a rod portion 11 formed in an elongated shape to support the sensor assembly 20, a sensor holding portion 12 disposed on a tip side of the rod portion 11, and a base portion side of the rod portion 11. And a mounting base 13 to be mounted on the case 5.
[0015]
The rod portion 11 is formed to have a length enough to hold the length of the harness 22 such that the sensor main body 21 of the sensor assembly 20 to be held can reach near one fin portion of the evaporator 3.
[0016]
As shown in FIGS. 2 and 3, the sensor holding portion 12 is arranged so as to rise from the tip of the rod portion 11, and has a groove 121 into which the harness 22 of the sensor assembly 20 can be inserted downward from the upper surface. . The width dimension of the groove 121 is larger than the harness 22 and smaller than the sensor main body 21 so that the harness 22 can be inserted. Further, as shown in FIG. 4, the groove 121 is closed by protrusions 122, 122 projecting from the sensor holding part 12 to the groove 121 side at the upper part, thereby preventing the sensor assembly 20 once inserted from coming off. ing.
[0017]
Therefore, by inserting the harness 22 into the groove 121 and then pulling the harness 22 toward the mounting pedestal 13, the sensor body 21 having a larger diameter than the groove 121 abuts on the groove 121 and can position and maintain the sensor body 121. It becomes.
[0018]
In the embodiment, as shown in FIGS. 2 and 3, the mounting base 13 has a tapered surface substantially the same as the tapered surface of the mounting hole 6 so that the mounting base 13 can be fitted into the mounting hole 6 formed in the unit case 5. And a rod portion 11 is connected to the lower portion. The mounting base 13 is formed of a resin material, and is integrally formed in two parts so as to be openable and closable by being connected at one end, and the protective tube 23 is inserted into the shaft core in a closed state. The insertion hole 131 has a larger diameter than the protection tube 23. Further, both ends of the mounting base 13 in the axial direction are formed in a flat shape, and a pair of hooks 132, 132 facing each other are arranged on the end surface on the rod 11 side so as to fit into the mounting hole 6 of the unit case 5. After the attachment, the hooks 132 can be engaged with the inner wall of the unit case 5 so that the bracket 10 is not detached from the unit case 5.
[0019]
Further, as shown in FIG. 3, a plurality of semi-circular disk-shaped lock claws 133 for gripping the protection tube 23 from both sides are arranged in the insertion hole 131 of the mounting base 13. The lock claw 133 is divided into two parts with the diameter surface of the semi-circular lock claw 133 facing the protection tube 23 so that the protection tube 23 can be gripped from both sides when the mounting base 13 is closed. Are formed alternately in the insertion holes 131. In the embodiment, two lock claws 133 are arranged in one of the two side divided insertion holes 131, and two lock claws 133 are arranged in the other side of the insertion hole 131. One piece is formed so as to be disposed between the first and second members 133.
[0020]
The mounting pedestal 13 is not limited to the above-described embodiment, and may be formed in, for example, three or more parts instead of two parts, and the lock claws 133 can grip the protection tube 23 from both sides. As long as the shape is not limited to a semi-circular shape, the shape may be a pin shape or the like, and the number is not limited.
[0021]
In the bracket 10 configured as described above, as shown in FIG. 5, the axis of the groove 121 of the sensor holding unit 12 and the axis of the insertion hole 131 of the mounting pedestal 13 match the bracket 10 to the unit case 5. The sensor assembly 20 mounted on the bracket 10 is located substantially on the same horizontal plane (indicated by a dashed line in FIG. 5). Will be done.
[0022]
Next, the operation of the sensor mounting structure configured as described above will be described.
[0023]
First, the sensor assembly 20 is attached to the bracket 10. The sensor body 21 is arranged in front of the holding member 12 of the bracket 10, and the tip of the harness 22 is inserted into the groove 121 of the holding member 12 of the bracket 10. After the insertion, the harness 22 is pulled toward the mounting pedestal 13 side, and the rear end of the sensor body 21 abuts on the sensor holding portion 12 of the bracket 10 so as to slightly bite, thereby positioning the sensor body 21 and Will be retained.
[0024]
On the other hand, the mounting base 13 formed in two parts is in an open state, and in this state, the harness 22 covered by the protection tube 23 of the sensor assembly 20 is inserted into the insertion hole 131 of the mounting base 13, The mounting base 13 is closed. By closing the mounting base 13, the lock claws 133 are gripped from both sides of the protective tube 23 so that the protective tube 23 is slightly bitten. As a result, the sensor assembly 20 is arranged in parallel with the rod portion 11 of the bracket 10 and is positioned and held by the bracket 10 to be fixed.
[0025]
In this state, the bracket 10 holding the sensor assembly 20 is mounted on the unit case 5. When the sensor main body 21 is mounted on the unit case 5, the sensor main body 21 is inserted into the mounting hole 6 of the unit case 5, and the sensor main body 21 enters the unit case 5 toward the vicinity of the fin of the evaporator 3. Then, the mounting base 13 is fitted along the tapered surface of the mounting hole 6. The engagement of the pair of hooks 132 of the mounting base 13 with the inner wall of the unit case 5 prevents the bracket 10 from being detached from the unit case 5 and completes the mounting.
[0026]
The mounting hole 6 formed in the unit case 5 is formed in advance so that the sensor main body 21 can reach a target mounting position of the evaporator 3 when the sensor assembly 20 is inserted. Since the sensor assembly 20 is mounted on the horizontal plane, when the sensor assembly 20 is inserted into the unit case 5, the sensor main body 21 is arranged at an intended regular position.
[0027]
The temperature of the cooling air blown to the indoor side through the evaporator 3 varies depending on each part of the evaporator 3, and the proper position where the sensor body 21 is attached is the cooling air blown to the indoor side by heat exchange. Is set to the lowest temperature part.
[0028]
When the sensor body mounted in this way detects a temperature lower than the set temperature when the refrigerant circulates in the refrigeration cycle, it turns off the compressor clutch (not shown) to increase the temperature in the cycle, and When a temperature higher than the detected temperature is detected, the above-described clutch is turned on to act to lower the temperature in the cycle.
[0029]
As described above, in the sensor mounting structure according to the embodiment, the bracket 10 holds the sensor holding portion 12 that holds the harness 22 of the sensor assembly 20 and the protection tube 23 that covers the harness 22 so that the sensor assembly 20 is displaced. Since the mounting base 13 having the locking claw 133 for preventing the sensor assembly is provided, the bracket 10 holding the sensor assembly 20 is mounted on the unit case 5 so that the sensor assembly 20 is not subjected to excessive force. The main body 21 can be arranged near the intended evaporator 3.
[0030]
At this time, since the sensor assembly 20 is gripped by the lock claws 133 arranged in the insertion holes 131 of the mounting pedestal 13, when the mounting pedestal 13 is fitted into the mounting hole 6, the sensor assembly 20 is No compression occurs on the 20 due to the fitting. Therefore, the sensor main body 21 can be attached to a predetermined position without damaging the sensor assembly 20.
[0031]
Further, since the mounting hole 6 formed in the unit case 5 is formed in a tapered shape having a small diameter toward the inside of the unit case 5, the mounting base 13 of the bracket 10 formed in substantially the same shape is required. It can be easily fitted into the mounting hole 6 easily. Therefore, when the sensor assembly 20 is inserted into the unit case 5, the sensor assembly 20 can be protected without being damaged.
[0032]
Further, by arranging the axes of the groove 121 of the sensor holding portion 12 of the bracket 10 and the insertion hole 131 of the mounting base 13 on the same horizontal line, the sensor assembly 20 is arranged on the horizontal line. In addition, the sensor main body 21 can be accurately arranged at a predetermined target position, and a target temperature can be detected.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a sensor mounting structure according to one embodiment of the present invention.
FIG. 2 is a perspective view showing a closed state of a mounting base in the bracket of FIG. 1;
FIG. 3 is a perspective view showing the upper body of the bracket of FIG. 1 with an open mounting base.
FIG. 4 is a side view of the bracket in FIG. 1;
FIG. 5 is a front view of the bracket in FIG. 1;
FIG. 6 is a partial sectional view showing a conventional sensor mounting structure.
[Explanation of symbols]
3 evaporator 5 unit case 6 mounting hole 10 bracket (sensor mounting member)
11 rod part 12 sensor holding part 121 groove (sensor holding means)
13 Mounting base 131 Insertion hole 133 Lock claw (position shift means)
20 Sensor assembly (sensor)
21 Sensor body 22 Harness 23 Protection tube

Claims (3)

A sensor mounting member is formed, comprising: holding means for holding the sensor in the vicinity of the heat exchanger; and misalignment preventing means for gripping the sensor and preventing misalignment of the sensor. A sensor mounting structure to be mounted on a case body containing an exchanger,
The holding means includes a groove for holding the sensor,
The displacement prevention means includes a lock claw that is disposed on a base formed to be openable and closable and grips the sensor,
A sensor mounting structure, wherein the sensor is arranged near the heat exchanger by inserting the pedestal into a mounting hole formed in the case body. 2. The sensor mounting structure according to claim 1, wherein the mounting hole is formed in a tapered shape having a smaller diameter toward the inside of the case body. 3. The sensor mounting structure according to claim 2, wherein the axes of the groove and the pedestal are arranged on the same horizontal line.

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