JP2019220417A - Mounting structure of temperature-sensitive member - Google Patents

Abstract

To provide a mounting structure of a temperature-sensitive member that suppresses variation in the detection temperature due to the contact condition of the temperature-sensitive member.SOLUTION: In a mounting structure of a temperature-sensitive member (5) according to the present disclosure for mounting the temperature-sensitive member (5) on a curved surface of an object to be detected, the temperature-sensitive member (5) includes a heat receiving portion (12a) and a heat transfer portion (30) having three or more projections (31A, 31B, 31C) protruding from the heat receiving portion (12a). Three protrusions (31A, 31B, 31C) of the three or more protrusions (31A, 31B, 31C) of the heat transfer portion (30) are located at the vertices of a triangle.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a mounting structure for a temperature-sensitive member.

  As a conventional structure for mounting a temperature-sensitive member, there is a structure in which a temperature-sensitive member having a planar contact surface is mounted on a planar upper surface of a compressor (see Patent Document 1).

JP 2001-263237 A

  When attaching a temperature-sensitive member having such a planar contact surface to a curved surface, the contact state between the temperature-sensitive member and the curved surface may not be stable. For this reason, there is a problem that the temperature detected by the temperature-sensitive member varies due to an unstable contact state between the temperature-sensitive member and the curved surface.

  The present disclosure proposes a mounting structure of a temperature-sensitive member that suppresses a variation in a detected temperature due to a contact state between the temperature-sensitive member and a curved surface.

The mounting structure of the temperature-sensitive member of the present disclosure,
A mounting structure of a temperature-sensitive member for mounting the temperature-sensitive member on a curved surface of an object to be detected,
The temperature-sensitive member is
Heat receiving part,
A heat transfer section having three or more protrusions provided to protrude from the heat receiving section;
Three of the three or more protrusions of the heat transfer section are located at the vertices of a triangle.

  According to the present disclosure, since three protrusions of the heat transfer portion are located at the vertices of the triangle, the temperature-sensitive member contacts the curved surface at at least three points. For this reason, the contact state of the temperature-sensitive member with the curved surface of the detected object is stabilized, and the variation in the detected temperature of the temperature-sensitive member due to the contact state of the temperature-sensitive member with the curved surface can be suppressed.

The mounting structure of the temperature-sensitive member of one embodiment,
The heat transfer section is characterized by comprising the three protrusions located at the vertices of the triangle.

  According to the above embodiment, since the three projections are located at the vertices of the triangle, the same three projections can always come into contact with the curved surface of the detection target, and when the temperature sensing member is attached to the curved surface of the detection target, Can be uniquely determined. For this reason, the contact state of the temperature-sensitive member to the curved surface is stabilized, and the contact area between the heat transfer section and the curved surface can be stabilized. Variation can be suppressed.

The mounting structure of the temperature-sensitive member of one embodiment,
The temperature-sensitive member includes a heat responsive body housed in a main body having the heat receiving unit,
The at least one protrusion is located at a position overlapping the heat responsive body when the heat receiving portion is viewed in a plan view.

  According to the above-described embodiment, since at least one protrusion of the heat transfer section is located at a position overlapping the heat responsive body, heat from the curved surface of the detected object can be easily transmitted to the heat responsive body via the protrusion.

The mounting structure of the temperature-sensitive member of one embodiment,
The projection has a spherical tip surface.

  According to the above embodiment, since the projection has a spherical tip surface and can always make point contact with the curved surface of the detected object, the contact state of the heat transfer section with the curved surface of the detected object is stabilized, Variations in the detected temperature at the temperature-sensitive member due to the contact state of the temperature-sensitive member with the curved surface of the detection object can be suppressed.

It is a typical perspective view showing the attachment state at the time of attaching the temperature sensing member concerning this indication to the side of a compressor. 1 is a perspective view of a temperature-sensitive member according to a first embodiment of the present disclosure. FIG. 3 is a plan view of the temperature-sensitive member according to the first embodiment. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. It is sectional drawing similar to FIG. 4 which shows the operation state of a temperature sensing member. It is a top view of a temperature sensing member concerning a 2nd embodiment of this indication. FIG. 7 is a sectional view taken along line VII-VII in FIG. 6. It is a top view of a temperature sensing member concerning a 3rd embodiment of this indication.

  Hereinafter, a mounting structure of a temperature-sensitive member according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, the same components are denoted by the same reference numerals.

[First Embodiment]
FIG. 1 is a schematic perspective view illustrating an attached state when the temperature-sensitive member according to the present disclosure is attached to a side surface of a compressor.

  Referring to FIG. 1, a compressor (object to be detected) 1 includes a casing 2 and an accumulator 3 arranged outside the casing 2. Inside the casing 2, a compression mechanism (not shown) and a motor (not shown) for driving the compression mechanism are provided. The accumulator 3 and the compression mechanism are fluidly connected via a suction pipe 4.

  The casing 2 has a cylindrical side surface 2a. An overload relay (temperature-sensitive member) 5 is attached to the side surface 2 a of the casing 2. Specifically, the overload relay 5 has a casing 2 so that a heat transfer section 30 (shown in FIG. 2) described later is pressed against a side surface 2 a of the casing 2 of the compressor 1 by a mounting member 6 such as a retainer. Attached to the side surface 2a. It is preferable that the mounting position of the overload relay 5 be near the compression mechanism, which is a heat source.

  FIG. 2 is a perspective view of the overload relay 5. FIG. 3 is a plan view of the overload relay 5.

  The overload relay 5 is used to protect the compressor 1 from overheating. The overload relay 5 is provided in a relay circuit (not shown) of a drive circuit (not shown) of a motor (not shown) for driving a compression mechanism (not shown) of the compressor 1.

  Referring to FIG. 2, the overload relay 5 of the present embodiment includes a main body 10 and two terminal boards 20A and 20B attached to the main body 10. The two terminal boards 20A and 20B are connected to the relay circuit that switches between a cut-off state in which the current flow of the drive circuit is cut off and an energized state in which the current flow of the drive circuit is allowed.

  The main body 10 of the overload relay 5 includes a case 11 and a cover 12 fitted to the case 11.

  The case 11 is a bottomed cylindrical member made of resin. Specifically, it has a disk-shaped bottom surface 11a and side surfaces 11b standing upright from the peripheral edge of the bottom surface 11a. As described above, the terminal plates 20A and 20B are attached to the bottom surface 11a of the case 11.

  The cover 12 is a bottomed cylindrical member made of aluminum. Specifically, the cover 12 includes a disc-shaped heat receiving portion 12a, and a tubular portion 12b that stands upright from the peripheral edge of the heat receiving portion 12a. The material of the cover 12 is not limited to aluminum, but preferably has good thermal conductivity. The cover 12 is fixed to the case 11 so as to cover the case 11. That is, the cylindrical portion 12 b of the cover 12 has an inner diameter larger than the outer diameter of the side surface 11 b of the case 11.

  The heat receiving portion 12a of the cover 12 is provided with a heat transfer portion 30 for transmitting heat from the side surface 2a (shown in FIG. 1) of the casing 2 of the compressor 1 to which the overload relay 5 is attached, to the heat receiving portion 12a. ing. The heat transfer section 30 is formed integrally with the heat receiving section 12a. That is, the heat transfer section 30 is made of aluminum. The heat transfer section 30 of the present embodiment has three protrusions 31A, 31B, 31C protruding from the heat receiving section 12a.

FIG. 3 is a plan view of the overload relay 5. FIG. 4 is a sectional view taken along the line IV-IV in FIG.

  Referring to FIG. 3, the three protrusions 31A, 31B, 31C of the heat transfer unit 30 of the present embodiment are arranged at the vertices of a triangle on the heat receiving unit 12a. Specifically, the three projections 31A, 31B, 31C of the heat transfer section 30 are arranged at the vertices of an equilateral triangle (see the two-dot chain line in FIG. 3) centered on the central axis C of the heat receiving section 12a. In other words, the three protrusions 31A, 31B, 31C of the heat transfer unit 30 are arranged at positions equidistant from the central axis C of the heat receiving unit 12a and at equal angular intervals of 120 degrees around the central axis C. 3 and 4, the protrusions 31A, 31B, and 31C of the present embodiment are hemispherical and have a spherical tip surface 31a. The distal end surfaces 31a of the protrusions 31A, 31B, 31C of the heat transfer section 30 of the present embodiment abut on the side surface 2a of the casing 2 of the compressor 1 in a state where the overload relay 5 shown in FIG.

  Referring to FIG. 4, the overload relay 5 includes a bimetal (thermally responsive body) 40 that deforms when a predetermined temperature is reached, a support member 41 that supports the bimetal 40, and a shaft formed by deformation of the bimetal 40 inside the main body 10. It includes a drive pin 42 that moves in the direction, and a switch mechanism 50 that is opened and closed by deformation of the bimetal 40. The overload relay 5 is in a cut-off state in which a current flow of a drive circuit (not shown) of a motor (not shown) for driving a compression mechanism (not shown) of the compressor 1 is cut off by the deformation of the bimetal 40. And an energized state in which the current flow of the drive circuit of the motor is permitted.

  The bimetal 40 of the present embodiment is a disk-shaped member whose central portion is convexly curved, and is composed of two metal plates having different coefficients of thermal expansion. The bimetal 40 is arranged between the cover 12 and the support member 41. Specifically, the bimetal 40 is disposed on the support member 41 so as to face the heat receiving portion 12a. The bimetal 40 has a convex shape on the heat receiving portion 12a side of the cover 12 in a state before the deformation. That is, the heat receiving portion 12a of the cover 12 is closest to the bimetal 40 at the center where the central axis C passes before the bimetal 40 is deformed.

  Referring to FIG. 3, the three projections 31A, 31B, 31C of the heat transfer section 30 of the cover 12 are arranged at positions overlapping the bimetal 40 in plan view.

  Referring to FIG. 4, the support member 41 of the present embodiment is an annular member made of resin. The support member 41 is sandwiched between the case 11 and the cover 12. The support member 41 has a concave portion 41a for accommodating the bimetal 40, and an insertion hole 41b through which the drive pin 42 can be inserted.

  The drive pin 42 is a cylindrical member made of ceramic. The drive pin 42 is disposed between the bimetal 40 and the movable contact spring 54. When the bimetal 40 is deformed, the drive pin 42 moves in the axial direction toward the movable contact spring 54 and presses the movable contact spring 54.

  The switch mechanism 50 of the present embodiment includes a fixed contact 51, a fixed contact plate 52 for supporting the fixed contact 51, a movable contact 53, and a movable contact spring 54 for urging the movable contact 53 toward the fixed contact 51. And When the movable contact 53 and the fixed contact 51 are opened, the current flow of a drive circuit (not shown) of a motor (not shown) for driving a compression mechanism (not shown) of the compressor 1 is cut off. State. Further, when the movable contact 53 and the fixed contact 51 are closed, the motor is brought into an energized state in which the current flow of the drive circuit of the motor is allowed. That is, when the movable contact 53 and the fixed contact 51 open and close, the cutoff state and the energized state are switched.

  The fixed contact 51 is made of a metal material having high electric conductivity such as brass, and is attached to the fixed contact plate 52. The fixed contact 51 is electrically connected to the terminal plate 20A (shown in FIG. 3).

  The fixed contact plate 52 is a plate-like member made of a metal material having high electric conductivity such as brass. The fixed contact plate 52 has a guide hole 52a opened in the axial direction so that the drive pin 42 can be inserted therethrough. The fixed contact plate 52 is disposed in a space formed by the case 11 and the support member 41. Fixed contact plate 52 is fixed to case 11 and terminal plate 20A (shown in FIG. 3) by rivets (not shown) made of brass. That is, the fixed contact plate 52 is supported by the rivet. The fixed contact plate 52 and the rivet electrically connect the fixed contact 51 and the terminal plate 20A.

  The movable contact 53 is made of a metal material having high electrical conductivity such as brass, and is attached to the movable contact spring 54 so as to face the fixed contact 51. The movable contact 53 is electrically connected to the terminal plate 20B.

  The movable contact spring 54 is made of a metal material having high electrical conductivity such as brass, and is a member having a U-shaped cross section in the cross section shown in FIG. The movable contact spring 54 is a leaf spring and urges the movable contact 53 toward the fixed contact 51. The movable contact spring 54 is fixed to the case 11 and the terminal plate 20B by rivets 55 made of brass. The movable contact spring 54 and the rivet 55 electrically connect the movable contact 53 and the terminal plate 20B.

(motion)
Hereinafter, the operation of the overload relay 5 will be described with reference to FIGS. FIG. 5 is a sectional view similar to FIG. 4 of the overload relay 5 in the operating state.

  Heat from the compressor 1 (shown in FIG. 1) is transmitted to the bimetal 40 by heat conduction through the heat transfer section 30 provided on the cover 12 and the heat receiving section 12a. Therefore, the temperature of the bimetal 40 indicates the temperature of the portion of the compressor 1 where the overload relay 5 is attached. Since the heat transfer section 30 and the heat receiving section 12a are made of aluminum, heat from the compressor 1 can be efficiently transmitted to the bimetal 40.

  When the temperature of the bimetal 40 is lower than the predetermined temperature, the bimetal 40 is convex toward the heat receiving portion 12a of the cover 12, as shown in FIG. Therefore, the movable contact spring 54 of the switch mechanism 50 urges the movable contact 53 toward the fixed contact 51, so that the contact state between the movable contact 53 and the fixed contact 51 is maintained, and the energized state is maintained.

  When the temperature of the compressor 1 rises, the heat from the compressor 1 is transmitted to the bimetal 40 by heat conduction through the heat transfer unit 30 provided on the cover 12 and the heat receiving unit 12a as described above. You. When the temperature of the bimetal 40 rises due to the heat from the compressor 1 and the temperature of the bimetal 40 reaches a predetermined temperature, the bimetal 40 is deformed so as to project toward the drive pin 42 as shown in FIG. Then, the drive pin 42 is moved toward the movable contact spring 54. The drive pin 42 moved toward the movable contact spring 54 presses the movable contact spring 54, and curves the movable contact spring 54 against the urging force so that the movable contact 53 is separated from the fixed contact 51. Thereby, the contact state between the movable contact 53 and the fixed contact 51 is released, and the state is switched from the energized state to the cutoff state.

  According to the present disclosure, since the three protrusions 31A, 31B, and 31C that configure the heat transfer unit 30 are located at the vertices of the triangle, the overload relay 5 always has three points on the cylindrical side surface 2a of the casing 2. Contact. In other words, the mounting posture of the overload relay 5 with respect to the side surface 2a of the casing 2 of the compressor 1 can be uniquely determined by the three projections 31A, 31B, 31C of the heat transfer unit 30. For this reason, the contact state of the protrusions 31A, 31B, 31C of the overload relay 5 with the cylindrical side surface 2a is stable, and the contact area between the protrusions 31A, 31B, 31C and the cylindrical surface 2a of the casing 2 is stable. Is stable. Thereby, it is possible to suppress the variation in the detected temperature at the overload relay 5 due to the contact state of the overload relay 5 with the casing 2 of the compressor 1.

  Further, since the three protrusions 31A, 31B, 31C of the heat transfer section 30 are located at positions overlapping the bimetal 40, heat from the compressor 1 is efficiently transmitted to the bimetal 40 by heat conduction via the protrusions 31A, 31B, 31C. it can.

  Since the projections 31A, 31B, 31C have the spherical tip surface 31a, they can always make point contact with the side surface 2a on the cylindrical surface of the casing 2. Therefore, the contact area between the protrusions 31A, 31B, 31C of the heat transfer section 30 and the side surface 2a of the casing 2 is stabilized, so that the variation in the detected temperature of the overload relay 5 can be suppressed.

  The point contact includes not only an ideal point contact in design but also a contact that can be regarded as an actual point contact.

  In the second embodiment and the third embodiment described below, the same or similar elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Furthermore, in the second embodiment and the third embodiment, the same operation and effect as those of the first embodiment are exerted, except for points specifically mentioned.

[Second embodiment]
FIG. 6 is a plan view of the overload relay 105 according to the present embodiment. FIG. 7 is a sectional view taken along the line VII-VII of FIG. The mounting structure of the temperature-sensitive member according to the present embodiment has the same configuration as that of the first embodiment except for the shape of the bimetal (thermoresponsive body), and FIGS. 1 and 2 are used.

  Referring to FIG. 6 and FIG. 7, the bimetal 140 according to the present embodiment has a band shape, and is convex toward the heat receiving portion 12 a side of the cover 12.

  As shown in FIG. 6, when the heat receiving portion 12a is viewed in a plan view, the protrusion 31A of the three protrusions 31A, 31B, and 31C of the heat transfer portion 30 of the present embodiment is arranged at a position overlapping the bimetal 140. I have.

  The mounting structure of the temperature-sensitive member according to the present embodiment has the same operation and effect as the first embodiment.

[Third embodiment]
FIG. 8 is a plan view of the overload relay 205 according to the present embodiment. The mounting structure of the temperature-sensitive member according to the present embodiment has the same configuration as that of the first embodiment except for the number and positions of the protrusions constituting the heat transfer section, and FIG.

  Referring to FIG. 8, the heat transfer section 230 of the present embodiment has four protrusions 31A, 31B, 31C, 31D protruding from the heat receiving section 12a. Arbitrary three projections among the four projections 31A, 31B, 31C, 31D of the heat transfer section 230 of the present embodiment are arranged at the vertices of a triangle. Specifically, the three protrusions 31A, 31B, and 31C of the heat transfer unit 230 form a triangle, and the three protrusions 31A, 31B, and 31D of the heat transfer unit 230 form a triangle. The three protrusions 31B, 31C, 31D of the heat transfer part 230 form a triangle, and the three protrusions 31A, 31C, 31D of the heat transfer part 230 form a triangle.

  The mounting structure of the temperature-sensitive member according to the present embodiment has the same operation and effect as the first embodiment.

  While the embodiments have been described, it will be understood that various changes in form and detail are possible without departing from the spirit and scope of the claims.

  For example, in the first to third embodiments, the heat responsive body is a bimetal, but may be another mechanism such as a shape memory alloy.

  The detection target to which the temperature sensing member is attached is not limited to the compressor, and may be, for example, a pipe.

1. Compressor (detected object)
2 ... casing 2a ... side surface 3 ... accumulator 4 ... suction pipe 5 ... overload relay (temperature sensing member)
Reference Signs List 6 mounting member 10 main body 11 case 11a bottom surface 11b side surface 12 cover 12a heat receiving portion 12b cylindrical portion 20A, 20B terminal plate 30 heat transfer portion 31A, 31B, 31C protrusion 31a distal end surface 40 … Bimetal (thermally responsive body)
41: Supporting member 41a: Recess 41b: Insertion hole 42: Drive pin 50: Switch mechanism 51: Fixed contact 52: Fixed contact plate 53: Movable contact 54: Movable contact spring 55: Rivet 105: Overload relay (temperature sensing member)
140 ... bimetal (thermally responsive body)
205 ... Overload relay (temperature-sensitive member)
230: heat transfer section

Claims (4)

A mounting structure of the temperature-sensitive member (5, 105, 205) for mounting the temperature-sensitive member (5, 105, 205) to the curved surface (2a) of the detection target (1),
The temperature-sensitive member (5, 105, 205)
A heat receiving section (12a);
A heat transfer section (30, 230) having three or more projections (31A, 31B, 31C, 31D) provided to protrude from the heat receiving section (12a);
Three of the protrusions (31A, 31B, 31C, 31D) of the three or more protrusions (31A, 31B, 31C, 31D) of the heat transfer portion (30, 230) are located at the vertices of a triangle. Characteristic mounting structure of the temperature-sensitive member (5, 105, 205). A mounting structure for the temperature-sensitive member (5, 105) according to claim 1,
The structure for mounting a temperature-sensitive member (5, 105), wherein the heat transfer section (30) includes three protrusions (31A, 31B, 31C) located at vertices of the triangle. A mounting structure for the temperature-sensitive member (5, 105, 205) according to claim 1 or 2,
The temperature-sensitive member (5) includes a heat-responsive body (40, 140) housed in a main body (10) having the heat-receiving portion (12a),
The at least one protrusion is located at a position overlapping the heat responsive body (40, 140) when the heat receiving portion (12a) is viewed in a plan view, wherein the temperature sensing member (5, 105, 205) is provided. Mounting structure. A mounting structure for the temperature-sensitive member (5, 105, 205) according to any one of claims 1 to 3,
The mounting structure for a temperature-sensitive member (5, 105, 205), wherein the protrusions (31A, 31B, 31C, 31D) have a spherical tip surface (31a).

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