JP2014098549A - Refrigerator manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a refrigerator capable of precisely detecting temperature of a cooler without increasing the number of manufacturing manhour.SOLUTION: In a method for manufacturing a refrigerator 1 comprising a cooler 20 in which fins 22 are fastened at predetermined intervals to plural stages of meandering refrigerant pipes 21 having U-shaped curved parts 21a, a temperature sensor 25 for detecting temperature of the cooler 20, a sensor holding part 51 holding the temperature sensor 25, engaged with the refrigerant pipe 21 and bringing the temperature sensor 25 into close contact with the refrigerant pipes 21, and a cover part 52 extending in an upward and downward direction, covering a lead wire 25a of the temperature sensor 25 and mounted to the curved parts 21a, a holding member 50 for coupling the sensor holding part 51 and the cover part 52 by a thin wire-like coupling part 55 is mounted to the cooler 20.

Description

  The present invention relates to a method for manufacturing a refrigerator provided with a temperature sensor that detects the temperature of a cooler.

  A conventional refrigerator is disclosed in Patent Document 1. In this refrigerator, a plurality of storage chambers are arranged vertically, and a cold air passage formed by a partition plate and a resin inner box is provided behind the storage chamber. A cooler is disposed in the upper part of the cold air passage. The cooler is formed by fixing fins at predetermined intervals on refrigerant pipes meandering in a plurality of stages, and is connected to a compressor operating a refrigeration cycle to be kept at a low temperature.

  A blower is disposed above the cooler in the cool air passage. Thereby, it is possible to prevent a decrease in reliability such as frost formation, moisture freezing, and increase in lubricating oil viscosity around the operating portion of the blower due to natural convection of cool air from the cooler. A defrost heater is arranged below the cooler in consideration of heat transfer efficiency such as radiation and conduction.

  Moreover, the temperature sensor hold | maintained by the holding member is provided in the upper part of a cooler. One surface of the holding member comes into contact with the fins arranged on the end surface of the cooler, and an elastic portion projects from the other surface. The holding portion is fixed by pressing the elastic portion against the curved portion of the refrigerant pipe curved in a U shape, and the temperature sensor is disposed in close contact with the fin.

  When the compressor is driven, the air flowing through the cold air passage and the cooler exchange heat to generate cold air. The cold air exchanged with the cooler is sent to each storage room, and each storage room is cooled.

  Further, since the cooling capacity is reduced due to clogging when the cooler is frosted, the defrosting operation of the cooler is performed at a predetermined time. When the defrosting operation is started, the compressor is stopped and the defrosting heater is driven. The cooler is heated from below by the radiant heat of the defrost heater, and the defrost heater is stopped when the temperature detected by the temperature sensor reaches a predetermined stop temperature (for example, 10 ° C.) for melting frost. Thereby, it becomes the temperature more than a stop temperature from the lower part to the upper part of a cooler, and a cooler is defrosted.

  According to the conventional refrigerator, the lead wire extending from the temperature sensor is swung by the cold air flowing through the cold air passage. For this reason, when the refrigerant pipe is arranged above and below the temperature sensor, the lead wire may contact the thin plate-like fin. In addition, when a partition plate that covers the front of the cooler is attached after the cooler is attached by welding in the manufacturing process, a lead wire may be sandwiched between the partition plate and the fin.

  In order to solve the above problem, Japanese Patent Application No. 2009-209932 describes a refrigerator in which a cover member that covers a lead wire is provided on a holding member that holds a temperature sensor of a cooler. FIG. 14 is a front view showing a cooler of the refrigerator.

  In the cooler 20, thin plate-like fins 22 are fixed to a refrigerant pipe 21 through which refrigerant flows at predetermined intervals. The refrigerant pipe 21 extends in the left-right direction, and is formed in a plurality of rows and a plurality of stages by meandering in the front-rear direction and the up-down direction via a curved portion 21a curved in a U shape at the left and right ends. A space portion 20 a is formed in the middle of the left end of the cooler 20 in the vertical direction, omitting the fins 22. An accumulator 23 for separating the gas and liquid is disposed above the cooler 20.

  A temperature sensor 25 that detects the temperature of the cooler 20 is attached by a holding member 50 disposed at the left end of the cooler 20. The holding member 50 is made of a resin molded product, and has a sensor holding part 51 and a cover part 52. The sensor holding part 51 is provided in the lower part of the holding member 50 and extends horizontally, and is formed in a U-shaped cross-section with the front surface covered and upper and lower wall surfaces.

  The sensor holding part 51 is provided with an engaging claw (not shown) on an arm part (not shown) protruding rearward. The engaging claws are formed on the front and back of the arm portion, the front engaging claws engage with the peripheral surface of the temperature sensor 25, and the rear engaging claws engage with the refrigerant pipe 21 of the space portion 20a. As a result, the temperature sensor 25 is in close contact with the refrigerant pipe 21.

  The cover portion 52 is formed in a U-shaped cross-section having a left and right wall surface that covers the front surface and continues to the upper and lower wall surfaces of the sensor holding portion 51, and extends vertically upward from the sensor holding portion 51. Therefore, the holding member 50 is formed in a substantially L shape in front view in which the front and side walls of the sensor holding part 51 and the cover part 52 are continuous.

  The cover portion 52 is provided with an extending portion (not shown) extending rearward from the right side wall. A thermal fuse 27 is attached to the extended portion. The thermal fuse 27 interrupts the defrost heater (not shown) when the cooler 20 becomes abnormally hot due to a failure of the temperature sensor 25 or the like. The extended portion is provided with a long hole (not shown) into which the curved portion 21a of the front refrigerant pipe 21 is fitted. As a result, the holding member 50 is positioned at a predetermined position with the hole portion of the cover portion 52 fitted into the curved portion 21 a and the engaging claw of the sensor holding portion 51 engaged with the refrigerant pipe 21.

  The lead wire 25 a extending from the temperature sensor 25 is locked to the inner surface side of the cover portion 52 and is guided above the cooler 20. Thereby, the swing of the lead wire 25a due to the circulation of cold air and the sandwiching of the lead wire 25a at the time of assembly can be prevented, and disconnection and insulation failure of the lead wire 25a can be prevented.

Japanese Patent Laying-Open No. 2005-55054 (pages 5-6, FIG. 2)

  However, according to the conventional refrigerator, the holding member 50 is integrally formed by the front surface and the side wall in which the sensor holding portion 51 and the cover portion 52 are continuous. For this reason, the rigidity of the connection part of the sensor holding | maintenance part 51 and the cover part 52 is high. Since the cooler 20 has the meandering refrigerant pipe 21, the refrigerant pipes 21 adjacent in the front-rear direction and the vertical direction may be separated from each other in the manufacturing process.

  At this time, the cover portion 52 to which the bending portion 21 a is fitted pulls the sensor holding portion 51 due to the separation of the refrigerant tube 21, and the engaging claw of the sensor holding portion 51 falls off from the refrigerant tube 21. As a result, there is a problem that the temperature sensor 25 is separated from the refrigerant pipe 21 and the temperature detected by the cooler 20 by the temperature sensor 25 becomes inaccurate. Thereby, the defrost period of the cooler 20 becomes long and the cooling efficiency of a refrigerator falls.

  On the other hand, if the sensor holding part 51 and the cover part 52 are formed by separate members and attached to the refrigerant pipe 21, separation between the refrigerant pipe 21 and the temperature sensor 25 can be prevented, but there is a problem that the number of manufacturing steps increases.

  An object of this invention is to provide the manufacturing method of the refrigerator which can detect the temperature of a cooler correctly, without increasing a manufacturing man-hour.

  In order to achieve the above object, the present invention provides a cooler having U-shaped curved portions and fins fixed to a refrigerant pipe meandering in a plurality of stages at predetermined intervals, and a temperature sensor for detecting the temperature of the cooler A sensor holding portion that holds the temperature sensor and is engaged with the refrigerant pipe to closely contact the temperature sensor with the refrigerant pipe, and extends in a vertical direction to cover the lead wire of the temperature sensor and the curved portion. In the manufacturing method of the refrigerator provided with the cover part attached, the holding member which connected the said sensor holding part and the said cover part with the thin-line-like connection part was attached to the said cooler, It is characterized by the above-mentioned.

  According to this configuration, the holding member in which the temperature sensor is held by the sensor holding portion and the lead wire of the temperature sensor is arranged in the cover portion is attached to the cooler. The sensor holding unit is engaged with the refrigerant pipe, and the temperature sensor is in close contact with the refrigerant pipe to detect the temperature of the cooler. The defrosting of the cooler is controlled by the temperature detected by the temperature sensor. The cover portion extends in the vertical direction from the sensor holding portion via a thin line-shaped connecting portion, and is attached to the refrigerant pipe. The lead wire is covered with a cover portion, and swinging of the lead wire due to the circulation of cold air is prevented. When the adjacent refrigerant pipes are separated in the front-rear direction or the vertical direction during the manufacturing process, the cover part pulls the sensor holding part via the connecting part. At this time, the connecting portion is deformed or broken, and the engagement state between the sensor holding portion and the refrigerant pipe is maintained.

  According to the present invention, in the refrigerator manufacturing method having the above-described configuration, a defrost heater that defrosts the cooler, and a temperature fuse that shuts off the defrost heater when the cooler becomes higher than a predetermined temperature. And the thermal fuse is held by the cover portion. According to this structure, the holding member holding the thermal fuse by the cover part is attached to the cooler. When the defrost heater is driven, the cooler is defrosted. When the cooler becomes abnormally hot, the defrost heater is interrupted by the temperature fuse held in the cover.

  Further, the present invention is the method for manufacturing a refrigerator having the above-described configuration, wherein the cover portion has an extending portion that extends in the front-rear direction on one wall surface, and the extending portion has a long hole shape that fits into the curved portion. It has a hole and an engaging part that engages with the refrigerant pipe. According to this configuration, the curved portion of the refrigerant tube is inserted into the hole provided in the extending portion, and the cover portion is fixed to the cooler by engaging the engaging portion with the refrigerant tube.

  Moreover, the present invention is characterized in that, in the method for manufacturing a refrigerator having the above-described configuration, the connecting portion is meandered. According to this configuration, when the adjacent refrigerant pipes are separated in the front-rear direction or the vertical direction, the connecting portion is easily deformed.

  Moreover, the present invention is characterized in that, in the refrigerator manufacturing method having the above-described configuration, the fins are provided close to an upper surface and a lower surface of the sensor holding portion. According to this configuration, when the sensor holding unit engaged with the refrigerant pipe rotates, the upper surface and the lower surface are in contact with the fin and the mounting position is held.

  According to the present invention, since the holding member in which the sensor holding portion that holds the temperature sensor and the cover portion that covers the lead wire are connected by the thin wire-like connecting portion is attached to the cooler, the sensor holding portion and the cover portion are integrated with each other. Can be attached to a cooler. Further, when the adjacent refrigerant pipes are separated in the front-rear direction or the vertical direction during the manufacturing process, the connecting part is deformed or broken, and the engagement state between the sensor holding part and the refrigerant pipe is maintained. Accordingly, it is possible to accurately detect the temperature of the cooler without increasing the number of manufacturing steps and preventing the temperature sensor from being separated from the refrigerant pipe.

Side surface sectional drawing which shows the refrigerator of embodiment of this invention The front view which shows the freezer compartment periphery of the refrigerator of embodiment of this invention The perspective view which shows the attachment state of the temperature sensor of the refrigerator of embodiment of this invention. The left view which shows the attachment state of the temperature sensor of the refrigerator of embodiment of this invention The perspective view which shows the holding member of the refrigerator of embodiment of this invention The front view which shows the holding member of the refrigerator of embodiment of this invention The rear view which shows the holding member of the refrigerator of embodiment of this invention The left view which shows the holding member of the refrigerator of embodiment of this invention AA sectional view of FIG. The perspective view which shows the principal part at the time of shaping | molding of the holding member of the refrigerator of embodiment of this invention The block diagram which shows the structure of the refrigerator of embodiment of this invention. The perspective view which shows the principal part at the time of shaping | molding of the other holding member of the refrigerator of embodiment of this invention. The perspective view which shows the principal part at the time of shaping | molding of the other holding member of the refrigerator of embodiment of this invention. Front view showing a conventional refrigerator cooler

  Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the same reference numerals are given to the same parts as those in the conventional example of FIG. FIG. 1 is a side sectional view showing a refrigerator according to an embodiment. The refrigerator 1 is provided with a refrigerator compartment 2 in which stored items are refrigerated and opened on the front by a door 2a. Below the refrigerating room 2, a freezing room 3 is stored via a heat insulating wall 6.

  Below the freezer compartment 3, a vegetable compartment 4 whose front is opened and closed by a door 4 a is arranged via a heat insulating wall 7. The vegetable room 4 refrigerates and stores vegetables at a temperature suitable for vegetables that are hotter than the refrigerator room 2. A machine room 5 provided with a compressor 17 for operating a refrigeration cycle is provided behind the vegetable room 4.

  Behind the refrigerator compartment 2 and the freezer compartment 3 are provided cold air passages 12 and 13 partitioned by back plates 12a and 13a, respectively. The cold air passages 12 and 13 communicate with each other through a damper 16 provided in the heat insulating wall 6. The cold air passage 12 is provided with a refrigerator compartment fan 14, and the cold air passage 13 is provided with a freezer compartment fan 15 and a cooler 20.

  The cooler 20 is connected to the compressor 17 and arranged on the low temperature side of the refrigeration cycle, and generates heat by exchanging heat with the air flowing through the cool air passage 13. Since the freezer compartment fan 15 is disposed above the cooler 20, it is possible to prevent a decrease in reliability such as frost formation, moisture freezing, and lubricating oil viscosity increase around the operating part due to natural convection of cool air from the cooler 20. .

  In the upper part of the back plate 12a of the refrigerator compartment 2, a cold air outlet 2b is opened. A cool air discharge port 3b is opened above the back plate 13a of the freezer compartment 3, and a return port 3c is opened below the back plate 13a so as to face the cooler 20 and return the cool air to the cool air passage 13. Since the freezer compartment fan 15 is arranged above the cooler 20 and the return port 3c faces the lower part of the cooler 20, the distance between the cooler 20 and the air for heat exchange is ensured to be long and the heat exchange efficiency is improved. be able to.

  FIG. 2 shows a front view around the freezer compartment 3. In the cooler 20, thin plate-like fins 22 are fixed to a refrigerant pipe 21 through which refrigerant flows at predetermined intervals. The refrigerant pipe 21 extends in the left-right direction, and is formed in a plurality of rows and a plurality of stages by meandering in the front-rear direction and the up-down direction via a curved portion 21a curved in a U shape at the left and right ends. In the present embodiment, the refrigerant pipes 21 are formed in meandering in two rows in the front and rear and eight steps in the upper and lower directions, and fins 22 are provided from the bottom to the seventh step.

  An accumulator 23 that is connected to the refrigerant pipe 21 and separates gas and liquid is provided at the upper part of the cooler 20. In addition, a temperature sensor 25 that detects the temperature of the cooler 20 is disposed in contact with the refrigerant pipe 21. A lower portion of the cool air passage 13 is widened in the left-right direction to form a cooler chamber 13b in which the cooler 20 is disposed.

  A defrost heater 31 made of a glass tube heater is disposed in the cold air passage 13 below the cooler 20 in consideration of heat transfer efficiency such as radiation and conduction. The cooler 20 is defrosted by energization of the defrost heater 31. A drain pan 32 for collecting defrost water is provided below the defrost heater 31. The defrost water is led to an evaporating dish (not shown) arranged in the machine room 5 (see FIG. 1) by a drain pipe 32a led out from the lower end of the drain pan 32. The defrost heater 31 is stopped based on the temperature detected by the temperature sensor 25.

  At the side of the cold air passage 13, there is provided a connecting passage 18 that connects the outlet 2 c that opens to the bottom of the refrigerator compartment 2 and the inlet 4 b that opens to the top of the vegetable compartment 4. A return port (not shown) that opens at the lower end of the cold air passage 13 is formed on the upper surface of the vegetable compartment 4.

  3 and 4 are a perspective view and a left side view showing the temperature sensor 25 attached. The temperature sensor 25 is attached to the cooler 20 by a holding member 50 disposed at the left end of the cooler 20. The holding member 50 may be disposed on the right end of the cooler 20. The holding member 50 is made of a resin molded product, and includes a sensor holding portion 51 disposed at a lower portion and a cover portion 52 extending vertically upward from the sensor holding portion 51.

  The temperature sensor 25 is held by the sensor holding part 51, and the temperature fuse 27 is held by the extending part 53 extending rearward of the cover part 52. The thermal fuse 27 is in close contact with the refrigerant pipe 21 and interrupts the defrost heater 31 (see FIG. 2) when the cooler 20 becomes abnormally hot due to a failure of the temperature sensor 25 or the like.

  A space portion 20a (see FIG. 2) in which the fins 22 are omitted is formed in the middle of the cooler 20 in the vertical direction, and the sensor holding portion 51 is attached to the refrigerant pipe 21 of the space portion 20a. For this reason, the fin 22 of the refrigerant | coolant pipe | tube 21 adjacent to the space part 20a is installed immediately above and directly under the sensor holding | maintenance part 51. FIG. Accordingly, the temperature sensor 25 is disposed so as to enter the cool air flow path for exchanging heat with the cooler 20. Therefore, it is possible to accurately determine whether or not the frost generated on the cold air flow path has been defrosted by the detection of the temperature sensor 25.

  5, 6, 7, and 8 are a perspective view, a front view, a rear view, and a left side view of the holding member 50. FIG. 9 is a cross-sectional view taken along the line AA in FIG. The holding member 50 is integrally formed by connecting the sensor holding part 51 and the cover part 52 by a thin line-like connecting part 55.

  When the holding member 50 is molded, as shown in FIG. 10, the sensor holding portion 51 is disposed on the lower extension of the cover portion 52 via the connecting portion 55. And the sensor holding | maintenance part 51 is extended and arranged with respect to the cover part 52 as shown in FIG. Thereby, shaping | molding of the holding member 50 can be performed easily.

  By forming the connecting portion 55 in a thin line shape, the rigidity is small, and the relative position between the sensor holding portion 51 and the cover portion 52 can be easily changed. At this time, if the width W in the left-right direction and the thickness t in the front-rear direction of the connecting portion 55 are smaller than 1 mm, the connecting portion 55 may break before the holding member 50 is attached due to transportation or the like. For this reason, the width W and the wall thickness t of the connection part 55 are formed in 1 mm-1.3 mm.

  The front surface of the sensor holding portion 51 is covered with a front plate 51e, and arm portions 51c extending rearward from the front plate 51e are arranged side by side. Engaging claws 51b are provided at the rear ends of both arms 51c. The upper arm portion 51c is provided with an engaging claw 51a in front of the engaging claw 51b. The engaging claw 51a engages with the peripheral surface of the cylindrical temperature sensor 25, and the temperature sensor 25 is sandwiched between the engaging claw 51a and the front plate 51e.

  The rear engaging claw 51b engages with the peripheral surface of the cylindrical refrigerant pipe 21 (see FIG. 3), and the refrigerant pipe 21 is sandwiched between the upper and lower engaging claws 51b. Thereby, the sensor holding part 51 is attached to the cooler 20. At this time, the engaging claw 51 b urges the refrigerant pipe 21 forward, and the temperature sensor 25 comes into close contact with the refrigerant pipe 21.

  Further, the fins 22 arranged above and below the space 20a (see FIG. 2) of the cooler 20 are provided close to the upper surface and the lower surface of the front surface portion 51e. Thereby, even if the sensor holding part 51 rotates with the refrigerant pipe 21 as an axis, the upper surface and the lower surface of the front face part 51e abut against the fins 22 and the attachment position of the sensor holding part 51 can be held.

  The front surface of the cover portion 52 is covered with the front plate 52e, and the side surface portion 52a extends rearward from the right end portion of the front plate 52e. A rib 52b formed in parallel with a predetermined distance from the front plate 52e protrudes from the side surface 52a. A plurality of support portions 52c extending substantially parallel to the side surface portion 52a are provided at the end portions of the front plate 52e and the ribs 52b.

  The lead wire 25a of the temperature sensor 25 is disposed in a space surrounded by the front plate 52e, the side surface portion 52a, and the support portion 52c, and the support portion 52c prevents the drop from the space. As a result, the swing of the lead wire 25a due to the cold air flowing through the cold air passage 13 is prevented. Therefore, disconnection of the lead wire 25a due to contact with the thin plate-like fins 22 can be prevented. Further, the upper surface of the cover portion 52 is disposed at substantially the same height as the fin 22 at the upper end of the cooler 20. Thereby, even if the lead wire 25a led out above the holding member 50 swings, the contact with the fin 22 is prevented.

  An extended portion 53 that extends rearward from the rib 52 b is provided on the side surface portion 52 a of the cover portion 52. The extending portion 53 is provided with front and rear ribs 53e and 53f extending vertically and projecting leftward. An elongated hole 53a is opened between the rib 52b and the rib 53e, and an engaging portion 53d protruding in the front-rear direction is formed at the tip of the ribs 53e and 53f. In addition, a protrusion 53g protruding rightward is formed above and below the hole 53a.

  The curved portion 21a (see FIG. 3) of the refrigerant pipe 21 in the front row is fitted into the hole portion 53a. The engaging portion 53d engages with the inner peripheral side of the curved portion 21a of the refrigerant pipe 21 adjacent to the front and rear. Further, the protruding portion 53 g contacts the fin 22. Thereby, the cover part 52 can be positioned and attached to the cooler 20.

  An engaging claw 53b is formed between the ribs 53e and 54f and at the tip of the rib 53e so as to protrude in a direction facing each other. The engaging claw 53 b engages with the peripheral surface of the cylindrical temperature fuse 27 to sandwich the temperature fuse 27. An engaging claw 53c is provided between the ribs 53e and 54f. The engaging claw 53c locks the lead wire 27a (see FIG. 4) of the thermal fuse 27. Thereby, the lead wire 27a is held between the engaging claw 53c and the rib 53f, and the lead wire 27a is guided above the extending portion 53.

  The lead wire 27a is covered with the side surface of the extended portion 53 and the rib 53f, and swinging due to the cold air flowing through the cold air passage 13 is prevented. Therefore, disconnection of the lead wire 27a due to contact with the thin plate-like fins 22 can be prevented. It is more preferable that the side surface of the extended portion 53 and the rib 53f are formed so as to extend to substantially the same height as the fin 22 at the upper end. Thereby, even if the lead wire 27a above the extending portion 53 swings, contact with the fin 22 is prevented.

  In the manufacturing process of the refrigerator 1, the holding member 50 to which the temperature sensor 25 and the temperature fuse 27 are attached is attached to the cooler 20. At this time, since the sensor holding portion 51 and the cover portion 52 are integrally formed by the connecting portion 55, the holding member 50 can be easily attached.

  Since the cooler 20 has the meandering refrigerant pipe 21, the refrigerant pipes 21 adjacent in the front-rear direction and the vertical direction may be separated from each other in the manufacturing process. The cover portion 52 to which the bending portion 21 a is fitted pulls the sensor holding portion 51 by the separation of the refrigerant pipe 21.

  At this time, the thin line-shaped connecting portion 55 is deformed, and the engagement claw 51b of the sensor holding portion 51 is prevented from dropping from the refrigerant pipe 21. Further, when the sensor holding part 51 is pulled strongly, the thin line-like connecting part 55 is broken. In this case as well, the engagement claw 51b is prevented from dropping from the refrigerant pipe 21. Therefore, the temperature sensor 25 does not leave the refrigerant pipe 21, and the temperature of the cooler 20 can be accurately detected and defrosted.

  FIG. 11 is a block diagram showing the configuration of the refrigerator 1. The refrigerator 1 has a control unit 40 that controls each unit. The compressor 17, the refrigerator fan 14, the freezer fan 15, the defrost heater 31, the temperature sensor 25, the temperature fuse 27, the room temperature sensor 41, the storage unit 42, and the timer 43 are connected to the control unit 40.

  The indoor temperature sensor 41 detects the indoor temperature of the freezer compartment 3, and the compressor 17 is driven based on the detection result. The storage unit 42 includes a RAM, a ROM, and the like, and stores an operation program of the refrigerator 1 and temporarily stores calculations by the control unit 40. The timer 43 measures the operating time of the refrigerator 1 and the operating time of the compressor 17.

  In the refrigerator 1 having the above-described configuration, the refrigeration cycle is operated by driving the compressor 17, the refrigerant flows through the refrigerant pipe 21, and the cooler 20 is maintained at a low temperature. The air flowing through the cold air passage 13 by driving the freezer compartment fan 15 exchanges heat with the cooler 20, and the cold air is discharged from the discharge port 3b to the freezer compartment 3. The cold air discharged from the discharge port 3b flows through the freezer compartment 3 and returns to the cooler 20 via the return port 3c. Thereby, the freezer compartment 3 is cooled.

  When the damper 16 is opened and the refrigerator compartment fan 14 is driven, the cold air flowing through the cold air passage 13 flows into the cold air passage 12. The cold air flowing through the cold air passage 12 is discharged from the discharge port 2b to the refrigerator compartment 2. The cold air discharged from the discharge port 2b flows through the refrigerator compartment 2 and flows out from the outlet 2c. The cold air that has flowed out of the outlet 2c flows through the connecting passage 18 and flows into the vegetable compartment 4 through the inlet 4b. The cold air flowing in from the inflow port 4b flows through the vegetable compartment 4 and returns to the cooler 20 through a return port (not shown). Thereby, the refrigerator compartment 2 and the vegetable compartment 4 are cooled.

  A defrosting operation is performed at a predetermined time in order to form frost on the cooler 20 that is cooled to a low temperature by driving the compressor 17. When the defrosting operation is started, the defrosting heater 31 is driven. When the temperature of the cooler 20 is detected by the temperature sensor 25 and the temperature detected by the temperature sensor 25 is sufficiently higher than the freezing point (for example, 10 ° C.), the defrost heater 31 is stopped. Thereby, the cooler 20 is defrosted.

  Further, when the cooler 20 becomes abnormally hot, higher than a predetermined temperature due to a failure of the temperature sensor 25 or the like, the defrost heater 31 is interrupted by the temperature fuse 27.

  According to the present embodiment, since the holding member 50 in which the sensor holding portion 51 that holds the temperature sensor 25 and the cover portion 52 that covers the lead wire 25a are connected by the thin wire-like connecting portion 55 is attached to the cooler 20, the sensor holding The part 51 and the cover part 52 can be integrally attached to the cooler 20. Further, when the adjacent refrigerant pipes 21 are separated in the front-rear direction or the vertical direction during the manufacturing process, the connecting part 55 is deformed or broken, and the engagement state between the sensor holding part 51 and the refrigerant pipe 21 is maintained. Therefore, the temperature of the cooler 20 can be accurately detected by preventing the temperature sensor 25 from moving away from the refrigerant pipe 21 without increasing the number of manufacturing steps.

  In addition, as shown in FIG. 12, FIG. 13, you may form the connection part 55 meandering. Thereby, the connection part 55 can deform | transform more easily and the engagement state of the sensor holding part 51 and the refrigerant | coolant pipe | tube 21 can be maintained more reliably.

  Further, since the temperature fuse 27 that interrupts the defrost heater 31 when the cooler 20 becomes higher than the predetermined temperature is held by the cover portion 52, the temperature sensor 25 and the temperature fuse 27 are simultaneously attached to the cooler 20. be able to.

  In addition, an extending portion 53 that extends in the front-rear direction on one wall surface of the cover portion 52 has a long hole-like hole portion 53 a that fits the curved portion 21 a and an engaging portion 53 d that engages the refrigerant pipe 21. Therefore, the cover part 52 can be easily positioned with respect to the cooler 20 and the positional deviation of the lead wire 25a can be prevented. Further, when the cover 52 holds the thermal fuse 27, the close contact state between the thermal fuse 27 and the refrigerant pipe 21 can be maintained.

  In addition, since the fins 22 are provided close to the upper and lower surfaces of the sensor holding unit 51, the upper and lower surfaces abut against the fins 22 even if the sensor holding unit 51 rotates about the refrigerant pipe 21 during the manufacturing process. Therefore, the engagement state between the sensor holding part 51 and the refrigerant pipe 21 can be more reliably maintained.

  In the present embodiment, the cover portion 52 may be formed to extend downward from the sensor holding portion 51. Further, although the end time of the defrosting operation is determined based on the temperature detected by the temperature sensor 25, the refrigeration cycle may be driven and controlled based on the temperature detected by the temperature sensor 25.

  According to this invention, it can utilize for the refrigerator provided with the temperature sensor which detects the temperature of a cooler.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerating room 3 Freezing room 3c Return port 4 Vegetable room 5 Machine room 12, 13 Cold air passage 13b Cooler room 14 Refrigerating room fan 15 Freezer room fan 16 Damper 17 Compressor 18 Connection passage 20 Cooler 20a Space part 21 Refrigerant Tube 21a Bending portion 22 Fin 23 Accumulator 25 Temperature sensor 25a Lead wire 27 Thermal fuse 27a Lead wire 31 Defrost heater 32 Drain pan 40 Control unit 41 Indoor temperature sensor 42 Storage unit 43 Timer 50 Holding member 51 Sensor holding unit 51a, 51b Engagement Claw 51c Arm 51e Front plate 52 Cover 52a Side 52b, 53e, 53f Rib 52c Support 52e Front plate 53 Extension 53a Hole 53b, 53c Engagement 53d Engagement 53g Protrusion 55 Connection

Claims (5)

  A cooler in which fins are fixed to a refrigerant pipe meandering in a plurality of stages and having a U-shaped curved portion, a temperature sensor for detecting the temperature of the cooler, and the refrigerant while holding the temperature sensor and the refrigerant Manufacture of a refrigerator comprising: a sensor holding portion that is attached to a pipe so that the temperature sensor is in close contact with the refrigerant pipe; and a cover portion that extends in a vertical direction to cover a lead wire of the temperature sensor and is attached to the curved portion. In the method, the manufacturing method of the refrigerator characterized by attaching the holding member which connected the said sensor holding | maintenance part and the said cover part by the thin-line-like connection part to the said cooler.   A defrost heater that defrosts the cooler; and a temperature fuse that shuts off the defrost heater when the cooler becomes higher than a predetermined temperature. The cover unit holds the temperature fuse. The manufacturing method of the refrigerator of Claim 1 characterized by the above-mentioned.   The cover portion has an extending portion that extends in the front-rear direction on one wall surface, and the extending portion engages with the refrigerant pipe and an elongated hole portion that engages with the curved portion. The manufacturing method of the refrigerator of Claim 1 or Claim 2 characterized by the above-mentioned.   The method for manufacturing a refrigerator according to any one of claims 1 to 3, wherein the connecting portion is formed by meandering.   The method for manufacturing a refrigerator according to any one of claims 1 to 4, wherein the fins are provided close to an upper surface and a lower surface of the sensor holding portion.