JP2007032984A - Refrigeration equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a quiet refrigeration unit capable of attenuating a noise accompanied to vibration transmitted to an outside of a refrigerator, as to a technique for preventing the noise of a decompressing motor-driven expansion valve for a refrigerant. <P>SOLUTION: In this refrigeration unit constituted to decompress a carbon dioxide refrigerant compressed at two stages by a compressor in the motor-driven expansion valve after heat-radiated in a heat radiator, the motor-driven expansion valve is stepping motor type one for opening and closing a refrigerant passage by a driving valve, based on a pulse signal electrified in a coil, and vibration absorbing member(s) is (are) attached to both an inlet side pipe and an outlet side pipe, or one thereof for the refrigerant in the motor-driven expansion valve. A problem wherein the vibration is generated when the stepping motor runs idle is thereby solved when a driving valve is started from a completely closed condition thereof, by making the driving valve run idle with supply of pulse signals of more excessive number than the number of regular pulses closing the driving valve so as to allow an accurate control operation for the motor-driven expansion valve, when feeding an electric power source or when finishing a defrosting operation for an evaporator (cooler 29), although the motor-driven expansion valve is used sometimes as a decompression device to be stored in a cold gas duct, in the refrigeration unit circulated with carbon dioxide as the refrigerant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigeration apparatus using a carbon dioxide refrigerant, and more particularly to a technique for preventing noise of an electric expansion valve for decompressing refrigerant.

In a refrigeration apparatus that circulates carbon dioxide as a refrigerant in a refrigeration circuit including a compressor, a radiator, an expansion apparatus, and an evaporator (cooler), there is an apparatus that uses an electric expansion valve as the expansion apparatus (for example, Patent Document 1). reference). In this patent document 1, the evaporator (cooler) is housed in a duct, and the cold air cooled by the evaporator (cooler) is circulated in the warehouse by an internal fan to cool the interior. In this case, the electric expansion valve (driving valve) that constitutes the electric expansion valve and the stepping motor that is a driving device thereof are placed in the duct that houses the evaporator (cooler) in order to facilitate repair and inspection. It is stored. In a refrigerator equipped with such a refrigeration apparatus, the electric expansion valve is configured such that the sensor detects the temperature in the refrigerator or the temperature of the evaporator (cooler), and the stepping motor is detected by a pulse signal supplied by the control circuit device. This is a mechanism that is intermittently driven to open and close the electric expansion valve (drive valve).
JP 2004-85103 A

  In order to maintain the correct operation of the electric expansion valve, it is desirable that the electric expansion valve (drive valve) start from a predetermined position. The present invention sets the operation start position of the electric expansion valve when the power is turned on or when the defrosting operation of the evaporator (cooler) is started, and is supplied by the operation of the control circuit device based on the detection of the temperature detection sensor. In response to the pulse signal, the stepping motor operates from the predetermined position to open and close the electric expansion valve (drive valve). This is called initialization of the start position of the electric expansion valve. At this initialization, the time when the electric expansion valve starts the stepping operation is the fully open position or the fully closed position of the electric expansion valve (drive valve). However, in the present invention, in order to obtain a stable operation of the electric expansion valve (driving valve), the closed position (fully closed position) is set.

  Such initialization is performed by supplying a pulse signal in the direction in which the electric expansion valve (drive valve) is closed to the stepping motor when the power is turned on or when the defrosting operation of the evaporator (cooler) is started. The drive valve is completely closed. In this case, the time when the electric expansion valve (drive valve) closes differs for each electric expansion valve due to an error or the like due to the configuration or assembly of the electric expansion valve, so the time when the electric expansion valve (drive valve) is completely closed In order to stop the pulse supply, the number of supply pulses must be set for each electric expansion valve, which requires a rather troublesome method. Therefore, if an extra pulse signal is supplied beyond the normal number of pulses that the electric expansion valve (driving valve) closes so that the stepping motor rotates idly, any electric expansion valve can be driven by the electric expansion valve (driving). It is ensured that the valve is completely closed. One of the methods is to set the number of pulses enough for the electric expansion valve (drive valve) to change from the fully open state to the fully closed state, and to defrost the evaporator (cooler) when the power is turned on. At the start, the total number of pulses is once supplied to the stepping motor, and the electric expansion valve (drive valve) is closed. In this case, even if the electric expansion valve (driving valve) is operated from the fully open state, if the electric expansion valve (driving valve) is closed, an extra pulse signal is supplied so that the stepping motor rotates idly. The electric expansion valve (drive valve) can be completely closed.

  In this case, a rattling sound is generated when the stepping motor is idling, and this vibration is transmitted to the refrigerator main body. It is not preferable because it gives the impression that the refrigerator is out of order. The present invention supplies a pulse signal in the direction in which the electric expansion valve (drive valve) closes to the stepping motor when the power is turned on or when the defrosting operation of the evaporator (cooler) is started. The sound generated when the battery is completely closed is prevented from being transmitted to the refrigerator body so that it cannot be heard outside the refrigerator or is difficult to hear.

  In the refrigeration apparatus according to the first aspect of the invention, after the carbon dioxide refrigerant compressed by the compressor is radiated by the radiator, the refrigerant is evaporated by an evaporator (cooler) for cooling the inside of the refrigerator through an electric expansion valve. A refrigerant circuit that returns to the compression section of the compressor, and the electric expansion valve is configured such that the drive valve opens and closes the refrigerant passage and the drive valve is closed by a pulse signal energized to the coil. It is a stepping motor system that performs initialization by supplying an extra pulse signal than the normal number of pulses to be closed, and refrigerant pipes are respectively connected to the refrigerant inlet side and outlet side of the electric expansion valve, and the inlet side A vibration absorbing member is attached to both or one of the refrigerant pipe and the outlet-side refrigerant pipe.

  In the refrigeration apparatus of the second invention, after the carbon dioxide refrigerant compressed by the compressor is radiated by the radiator, it evaporates by an evaporator (cooler) for cooling the inside of the refrigerator through the electric expansion valve. A refrigerant circuit that returns to the compression section of the compressor, and the electric expansion valve is configured such that the drive valve opens and closes the refrigerant passage and the drive valve is closed by a pulse signal energized to the coil. It is a stepping motor system that performs initialization by supplying an extra pulse signal than the normal number of pulses to be closed, and refrigerant pipes are respectively connected to the refrigerant inlet side and outlet side of the electric expansion valve, and the inlet side A U-shaped or loop-shaped bent portion is formed in the middle or both of the refrigerant pipe and the outlet-side refrigerant pipe, and a vibration absorbing member is attached to the bent portion.

  The refrigeration apparatus according to a third aspect of the present invention is the refrigeration apparatus according to the first or second aspect of the present invention, wherein the vibration absorbing member is configured to connect both or one of the refrigerant pipe on the inlet side and the refrigerant pipe on the outlet side with a pair of sandwiching sides bonded to each other. It is characterized by comprising rubber material to be sandwiched.

  According to the first invention, the transmission of vibrations generated by the electric expansion valve is attenuated, and it is difficult to hear or difficult to hear outside the refrigerator, and a quiet refrigerator is obtained.

  According to the second aspect of the present invention, the U-shaped or loop-shaped flexures of the refrigerant inlet side and the outlet side refrigerant pipe of the electric expansion valve make it easy to attenuate the vibration transmitted through the refrigerant pipe flexibility. In combination with this action, transmission of vibrations generated by the electric expansion valve can be attenuated, so that it is difficult to hear or difficult to hear outside the refrigerator, resulting in a quiet refrigerator.

  In the third aspect of the invention, the vibration absorbing member is easily attached to the inlet side refrigerant pipe and the outlet side refrigerant pipe by adhering to each other, and balanced by sandwiching the refrigerant pipe on the inlet side and the refrigerant pipe on the outlet side. It can be attached and vibrations can be attenuated accurately, and an effect in addition to the effect of the first invention or the second invention can be achieved.

In the refrigeration apparatus of the present invention, after the carbon dioxide refrigerant compressed by the compressor is radiated by the radiator, it evaporates by an evaporator (cooler) for cooling the inside of the refrigerator through the electric expansion valve, constitute a refrigerant circuit for feeding back to the compression section of the compressor, the electric expansion valve, prior to opening and closing valve by the pulse signal energizing the coil of the refrigerant passage SL driven valve is closed the drive valve in a direction It is a stepping motor system that performs initialization by supplying an extra pulse signal than the normal number of pulses to be closed, and refrigerant pipes are respectively connected to the refrigerant inlet side and outlet side of the electric expansion valve, and the inlet side A vibration absorbing member is attached to both or one of the refrigerant pipe and the outlet-side refrigerant pipe. Examples of the invention are described below.

  Next, an embodiment of the present invention will be described. 1 is a front view of a refrigerator-freezer, FIG. 2 is an explanatory view of the refrigerator-freezer body viewed from the front, FIG. 3 is a longitudinal side view of the refrigerator-freezer, FIG. 4 is a circuit block diagram of the refrigerator, and FIG. FIG. 6 is a front view showing the connection between the electric expansion valve and the freezer compartment evaporator (cooler), FIG. 7 is a side view of FIG. 6, and FIG. 8 is the electric expansion valve and the refrigerator for the refrigerator compartment. FIG. 9 is a side view of FIG. 8, FIG. 10 is a cross-sectional view showing the configuration of the electric expansion valve, and FIG. 11 is the relationship of the coil phase of the stepping motor of the electric expansion valve. FIG. 12 is an operation explanatory view showing the relationship between the opening / closing operation of the drive valve of the electric expansion valve and the energization of the coil phase of FIG. 11, and FIG. 13 is a diagram showing the attachment of the vibration absorbing member to the loop portion of the refrigerant pipe. FIG. 14 is a perspective view in which the vibration absorbing member is attached to the U-shaped portion of the refrigerant pipe.

  1 to 3, reference numeral 1 denotes a refrigerator-freezer that is one of the cooling storages of the present invention, and the inside of a main body 2 having a front opening is partitioned to form a plurality of storage chambers. It can be opened and closed with. The refrigerator-freezer main body 2 has a heat insulating structure in which a foam heat insulating material 2C is filled between an outer box (outer wall plate) 2A and an inner box (inner wall plate) 2B. In the refrigerator-freezer main body 2, the refrigerator compartment 3 is provided in the upper part, the freezer compartment 5 and the ice making room 6 are provided side by side below, and the vegetable compartment 4 is arrange | positioned under it.

  A plurality of shelves 3 </ b> A are provided in the refrigerator compartment 3 so as to be placed on a shelf holder formed on the side wall of the refrigerator compartment 3. The front opening of the refrigerator compartment 3 is opened and closed by a revolving refrigerator door 10 that is rotated laterally by a hinge device on one side of the refrigerator refrigerator body 2. The front opening of the vegetable compartment 4 is closed by a pull-out door 11 that is drawn forward together with the vegetable container 15 supported so that it can be pulled out in the front-rear direction by a support device 18 by left and right rails 18A and rollers 18B provided in the vegetable compartment 4. Has been. The front opening of the freezer compartment 5 and the ice making chamber 6 is closed at one side of the freezer refrigerator body 2 by a pivotable door 12 that pivots laterally by a hinge device. The front opening of the chamber 6 may be configured to be closed by separate doors 12A and 12B (not shown). In this case, similarly to the vegetable compartment 4, the freezer compartment 5 is a drawer type in which a container supported so as to be able to be drawn out in the front-rear direction with respect to the left and right rails provided in the freezer compartment 5 is drawn out together with the door 12A. As with the vegetable compartment 4, the ice making chamber 6 is a drawer type in which an ice storage container, which will be described later, is supported with respect to the left and right rails provided in the ice making chamber 6 so that it can be pulled out in the front-rear direction. It may be configured.

  The refrigerator compartment 3 located in the upper part and the side-by-side freezing room 5 and ice making room 6 located in the lower part are partitioned by a heat insulating partition wall 17A, and the side-by-side freezing room 5 and ice making room 6 and below The vegetable compartment 4 is partitioned by a heat insulating partition wall 17B. 45 is a back wall member of the refrigerator compartment 3 disposed on the front side of the back wall of the refrigerator body 2, and is composed of a combination of a synthetic resin back plate and a heat insulating material such as styrene foam attached to the back side thereof. 3 is formed with a cold air passage (cold air duct) 43 in the vertical direction and cold air passages (cold air ducts) 43A and 43B on the left and right sides thereof.

  The freezing chamber 5 and the ice making chamber 6 are divided into a front opening ice making chamber 6 which is kept at the freezing temperature on the left side by a partition plate 47A, and a freezing chamber 5 which is kept at the freezing temperature on the right side. An automatic ice maker 7 is disposed at the top, and an ice storage container 8 having an upper surface opening is disposed below the automatic ice maker 7. The ice storage container 8 is supported by a rail 6A provided on the left and right side walls of the ice making chamber 6 so as to be drawn out in the front-rear direction. The automatic ice making machine 7 includes an ice tray 7B that is rotationally driven by an electric mechanism 7A, and the ice made in the ice tray 7B by the ice making process is reversed while twisting the ice tray 7B by the electric mechanism. It operates so that the ice is separated into the ice storage container 8 below.

  Reference numeral 9 denotes a water supply container (also referred to as a water storage container) for storing ice making water supplied to the automatic ice making machine 7, which has a rectangular shape whose depth is longer than the horizontal width, and is formed by partitioning the inside of the refrigerator compartment 3 with a partition wall 47B. It is arrange | positioned at the small chamber 46, it cools with the temperature in the refrigerator compartment 3, and it can take out ahead by opening the front door 10 of the refrigerator compartment 3. The specific low temperature chamber 13 is provided next to the small chamber 46 partitioned by the partition wall 47B.

  The ice making water is supplied from the water supply container 9 to the ice making tray 7B of the automatic ice making machine 7 through the water supply channel 51 by the natural drop method by opening the solenoid on-off valve device 51A for a predetermined time. The ice tray 7B is a synthetic resin in which 8 to 12 square ices are made by dividing into a plurality of ice making chambers such as four rows, two rows, six rows and two rows with the longitudinal direction as the row direction. It is made. The ice storage container 8 is made of a white, transparent, translucent or other color synthetic resin, and has a box shape with a top opening that is longer than the left and right widths.

  As shown in FIG. 3, a machine room 28 is formed at the bottom of the refrigerator-freezer main body 2. The machine room 28 includes an electric compressor 24 that compresses the refrigerant of the refrigeration apparatus according to the present invention, and the refrigerant of the refrigeration apparatus. A radiator 25A, a radiator 25B, a radiator 25C, and an evaporator tray 26 for evaporating defrost water (to be described later) by heat of the radiator 25B, which are a part of the radiator 25, are arranged. Yes. The electric compressor 24, the radiator 25 </ b> A including the radiator 25 </ b> B, and the radiator 25 </ b> C in the machine room 28 are heat-exchanged by the wind from the blower 81 to dissipate heat. Reference numerals 29 and 30 denote refrigerant evaporators (coolers) of the refrigeration apparatus provided for cooling the inside of the refrigerator. Reference numeral 31 denotes a first blower that circulates the cold air cooled by a first evaporator (cooler) 29 serving as a freezer cooler into the refrigerator, that is, to the freezer compartment 5 and the ice making chamber 6. Reference numeral 32 denotes a second blower that circulates the cold air cooled by the second evaporator (cooler) 30, which is a refrigerator for the refrigerator compartment, into the refrigerator, that is, the refrigerator compartment 3, the vegetable compartment 4, and the specific low temperature compartment 13. Reference numeral 33 denotes a defrosting glass tube heater of the first evaporator (cooler) 29, and reference numeral 34 denotes a defrosting glass tube heater of the second evaporator (cooler) 30. The defrosted water from the first evaporator (cooler) 29 and the second evaporator (cooler) 30 is led to the evaporating dish 26 through the drain pipe 23 and evaporated there.

  The refrigeration apparatus according to the present invention uses carbon dioxide refrigerant as the refrigerant. The compressor 24 is configured to compress the refrigerant in two stages by a first-stage compression unit 24A and a second-stage compression unit 24B, and is provided with a known rotor that is respectively rotated by an electric motor (motor) in a sealed container. Although it is a two-cylinder rotary compressor (referred to as a rotary compressor) and comprises a first-stage compression section 24A and a second-stage compression section 24B, other forms of compressing refrigerant in two stages may be used.

  FIG. 4 is a circuit block diagram of the refrigeration apparatus, and FIG. 5 is an explanatory diagram of the refrigerant flow path. In these figures, 25A to 25E constitute the refrigerant radiator 25, which is an air-cooled type, and the refrigerant pipe (tube) is spirally wound so that the radiator 25A has a cylindrical shape. This is a first-stage radiator called a loop capacitor. The radiator 25B is disposed so as to be immersed in the defrosted water led into the evaporating dish 26, and is a refrigerant pipe (tube) for evaporating the defrosted water. The radiator 25C has a configuration in which a refrigerant pipe (tube) 25C2 arranged in a meandering manner is mounted on a substantially flat radiator plate 25C1, and is horizontal to the bottom of the machine chamber 28 in the rear region of the evaporating dish 26. Arranged in a state. The radiator 25D is a fin-tube main radiator in which an aluminum foil plate (thin plate) 25D2 serving as a radiation fin is spirally wound around a refrigerant pipe (tube) 25D1 in a meandering shape. It arrange | positions in the horizontal state on the heat radiator 25C so that heat may be exchanged with the wind from the air blower 81 in the machine room 28. FIG. The radiator 25E is a refrigerant pipe attached to the surface of the outer casing (outer wall plate) 2A on the side of the foam heat insulating material 2C so that the outer box (outer wall plate) 2A of the refrigerator-freezer main body 2 serves as a radiator plate.

  The radiator 25E is a radiator that acts mainly for preventing the adhesion of the front opening of the refrigerator-freezer body 2 and prevents the outer box (outer wall) from being used as the outer box (outer wall plate) 2A. Plate) A refrigerant pipe attached to the surface of the foam insulation 2C side of 2A, a refrigerant pipe 25E1 for heating the front surface of the heat insulation partition wall 17A, a refrigerant pipe 25E2 for heating the front surface of the heat insulation partition wall 17B, and vegetables It is the structure arrange | positioned so that the front periphery of the refrigerator compartment 3, the freezer compartment 5, the ice-making room 6, and the vegetable compartment 4 may be heated including the refrigerant | coolant pipe 25E3 which heats the bottom part front surface of the chamber 4. FIG.

  Reference numeral 70 denotes a dehydrator that encloses a desiccant that removes moisture from the refrigerant. 71 and 72 are electric expansion valves, 73 and 74 are refrigerant introduction pipes that have passed through the dehydrator 70, and 75 and 76 are refrigerant pipes connected to the refrigerant introduction pipes 73 and 74, respectively. Electric expansion valves 71 and 72 are connected in the middle of 75 and 76, respectively. 77 is a check valve, and 78 is a muffler as a silencer. In FIG. 4, the arrow indicates the flow direction of the refrigerant, and the arrow in FIG. 5 also indicates the flow direction of the refrigerant.

  The compressor 24, the blower 31, the blower 32, and the blower 81 are operated (ON). The high-temperature and high-pressure refrigerant gas compressed by the first-stage compression unit 24A of the compressor 24 is radiated by the radiator 25A through the muffler 78, enters the second-stage compression unit 24B of the compressor 24, and is compressed there. The The high-temperature and high-pressure refrigerant gas compressed by the second-stage compression unit 24B evaporates the defrost water in the evaporating dish 26 in the radiator 25B. The refrigerant gas exiting the radiator 25B is cooled by the air from the blower 81 in the radiator 25D from the radiator 25C, and the refrigerant temperature is lowered to a temperature slightly higher than the ambient temperature of the refrigerator-freezer 1. This refrigerant further flows into the radiators 25F and 25E, and the front opening of the refrigerator-freezer main body 2 is heated, and acts to prevent dew from being applied to those portions.

The refrigerant leaving the radiator 25E is branched to the introduction pipe 73 and 74 through the Dehaidoreta 70, the circuit of the first refrigerant pipe 75 and the electric expansion valve 71, respectively, DOO second refrigerant pipe 76 collector Doshiki expansion Through the circuit of the valve 72, the pressure is reduced and the temperature decreases, and the refrigerant flows into the freezer compartment evaporator (cooler) 29 and the refrigerator compartment evaporator (cooler) 30, respectively. The liquid refrigerant that has flowed into the first evaporator (cooler) 29 and the second evaporator (cooler) 30 evaporates there and cools the surrounding air. The gas refrigerant evaporated in the first evaporator (cooler) 29 flows from the outlet pipe 79 through the check valve 77 to the suction side of the first stage compression unit 24A of the compressor 24 and is compressed. Further, the gas refrigerant evaporated in the second evaporator (cooler) 30 flows from the outlet pipe 80 through the check valve 77 to the suction side of the first stage compression unit 24A of the compressor 24 and is compressed. With such a refrigeration cycle, the first evaporator (cooler) 29 and the second evaporator (cooler) 30 are cooled, thereby cooling each chamber in the refrigerator-freezer main body 2 as described later.

  In the above refrigeration apparatus, the electric expansion valve 71 is driven by a driving valve 120 (described later) operated by a stepping motor 102 (described later) that performs forward and reverse rotations according to a control signal from a control circuit device (not shown). The valve opening is adjusted, and the stepping motor 102 is rotated forward or backward based on the data set in the control circuit device according to the outlet temperature of the evaporator (cooler) 29 or the temperature of the freezer compartment 5. The drive valve 120 is operated in reverse and the valve opening is adjusted, and control is performed so that proper refrigerant expansion is performed. In addition, the electric expansion valve 72 is configured such that a later-described driving valve 120 is operated and a valve opening degree thereof is adjusted by a later-described stepping motor 102 that performs forward and reverse operations according to a control signal. Based on the data set in the control circuit device (not shown) according to the outlet temperature of the (cooler) 30, the stepping motor 102 rotates forward or reversely to operate the drive valve 120 and adjust the valve opening degree. Then, control is performed so that proper refrigerant expansion is performed.

  The cooling operation of the refrigerator-freezer 1 will be described. In this refrigerator 1, the cooling operation is started by the temperature of the freezer compartment 5. When the temperature of the freezer compartment 5 rises to a predetermined upper limit set temperature, the control circuit device starts a cooling operation. At the start, the control circuit device detects the temperature of the refrigerator compartment 3, and when the temperature of the refrigerator compartment 3 exceeds a predetermined upper limit set temperature, cooling of the refrigerator compartment 3 precedes the cooling of the freezer compartment 5. If the temperature of the refrigerator compartment 3 does not exceed a predetermined upper limit set temperature, the freezer compartment 5 is cooled. Here, it is assumed that the temperature of the refrigerator compartment 3 exceeds a predetermined upper limit set temperature. Therefore, the control circuit device first cools the refrigerator compartment 3. The control circuit device operates (ON) the compressor 24, opens the electric expansion valve 72 to the opening at the time of cooling the previous refrigerator compartment, and operates (ON) the second blower 32. And if the refrigerator compartment 3 falls to predetermined | prescribed lower limit setting temperature, it will switch from cooling of the refrigerator compartment 3 to cooling of the freezer compartment 5. FIG. The control circuit device stores the value of the opening degree of the electric expansion valve 72 at this time, fully closes the electric expansion valve 72, stops (turns off) the second blower 32, and sets the electric expansion valve 71. The first blower 31 is operated (ON) by opening to the opening degree at the time of the previous freezer cooling. Thereby, the freezer compartment 5 is cooled. When the freezer compartment 5 is lowered to a predetermined lower limit set temperature, the freezing operation is terminated. The control circuit device stores the value of the opening degree of the electric expansion valve 71 at this time, fully closes the electric expansion valve 71, stops the first blower 31 (OFF), and stops the compressor 24 ( OFF).

  Next, the circulation of cold air will be described with reference to FIGS. Reference numeral 35 denotes a cold air duct in which the cold air cooled by the second evaporator (cooler) 30 is guided from the second blower 32 and is widely arranged along the upper wall of the refrigerator compartment 3, and the front end thereof is the refrigerator compartment 3. It communicates with a cold air outlet 36 formed on the upper surface of the front opening. The cold air blown out from the cold air outlet 36 forms a cold air curtain 37 that flows from the top to the bottom as indicated by the arrow in the front opening of the refrigerator compartment 3. The cold air cooled by the first evaporator (cooler) 29 and the cold air cooled by the second evaporator (cooler) 30 are circulated as indicated by arrows by the first blower 31 and the second blower 32, respectively, and each chamber is circulated. Cool to a predetermined temperature.

  Regarding the formation of a cold air circulation path in which the cold air cooled by the second evaporator (cooler) 30 is circulated to the refrigerator compartment 3 and the vegetable compartment 4 by the second blower 32, a cold air passage (cold air) is provided at the back of the refrigerator compartment 3. Duct) 43 is formed, and cold air passages (cold air ducts) 43A and 43B are formed on both the left and right sides, and the second evaporator (cooler) 30 is accommodated in the cold air supply passage (cold air duct) 43 and the cooler chamber. Is configured. The electric expansion valve 72 extends upward from the second evaporator (cooler) 30 and is attached with a screw in a state where it is covered with a rubber cover 90 in a recess on the back surface of the cold air supply passage (cold air duct) 43. ing.

  The cold air cooled by the second evaporator (cooler) 30 is circulated by the second blower 32 to the refrigerating chamber 3 and the specific low temperature chamber 13 which is a part thereof. In the path, a part of the cold air passing through the second blower 32 is blown out from the cold air outlet 36 through the cold air duct 35. The other part of the cool air that has passed through the second blower 32 passes through the left and right cool air passages 43A and 43B on the back side of the back plate 45 of the refrigerating chamber 3 and from the cold air outlet 39 formed in the back plate 45 of the refrigerating chamber 3. The cool air blown out to the refrigerating chamber 3 and further flows downward through the cool air passage 43B blows out from the cool air outlet 39A to the specific low temperature chamber 13. The cold air that has flowed into the refrigerator compartment 3 and the specific low temperature chamber 13 is sucked from the suction port 50 at the lower part of the refrigerator compartment 3, that is, the suction port 50 formed in the back wall of the small chamber 46 and the specific low temperature chamber 13. ) 43 flows into the cold air suction side below the second evaporator (cooler) 30 and circulates again by the second evaporator (cooler) 30.

  On the other hand, a part of the cold air flowing into the refrigerator compartment 3 is circulated to the vegetable compartment 4. 2 and 3, a part of the cold air flowing into the specific low temperature chamber 13 is sucked from the suction port 40 formed in the back wall of the specific low temperature chamber 13, and the cold air passage formed in the back wall of the refrigerator refrigerator body 2 ( Cold air duct) 41A flows out from the outlet 42A to the vegetable compartment 4. The cold air flowing into the vegetable room 4 flows through the vegetable room 4 and from the cold air inlet 42B formed in the back wall close to the ceiling wall of the vegetable room 4 through the cold air return passage (cold air return duct) 41B. It flows into the cold air suction side of the lower part of the second evaporator (cooler) 30 of the cold air duct) 43 and circulates again cooled by the second evaporator (cooler) 30.

  Regarding the formation of a cold air circulation path for circulating the cold air cooled by the first evaporator (cooler) 29 to the freezer compartment 5 by the first blower 31, a cold air passage (cold air duct) 48 is formed in the back surface of the freezer compartment 5. In this cold air supply passage (cold air duct) 48, a first evaporator (cooler) 29 is accommodated to constitute a cooler chamber. The electric expansion valve 71 extends upward from the first evaporator (cooler) 29 and is attached with a screw in a state where it is covered with a rubber cover 91 in a recess on the back of the cold air supply passage (cold air duct) 48. ing.

  The cold air cooled by the first evaporator (cooler) 29 is supplied from the cold air outlet 37A to the freezer compartment 5 by the first blower 31, supplied from the cold air outlet 37B to the ice making chamber 6, and sucked from the inlet 38, respectively. Rarely, it flows into the cold air suction side below the first evaporator (cooler) 29, and circulates again cooled by the first evaporator (cooler) 29.

  In the refrigerator 1, the first and second evaporators (coolers) 29 and 30 are defrosted simultaneously. When the accumulated operation time of the compressor 24 at the end of the cooling operation exceeds a predetermined value, the cooling storage 1 is in the defrosting mode. The defrosting glass tube heaters 33 and 34 are energized to generate heat, and the corresponding first and second evaporators (coolers) 29 and 30 are heated to melt the frost. The end of the defrosting is detected when the defrosting end detection temperature sensors provided in the first and second evaporators (coolers) 29 and 30 detect the defrosting end temperature (for example, 8 ° C.). The energization to one side of the defrosting glass tube heater corresponding to the evaporator (cooler) is stopped (OFF). For the remaining evaporators (coolers), when the defrosting end detection temperature sensor detects the defrosting end temperature (for example, 8 ° C.), energization of one of the remaining defrosting glass tube heaters is stopped ( OFF). Thus, when the defrosting of both evaporators (coolers) is completed, the refrigerator-freezer 1 returns to the normal mode. At this time, since the temperature of both the freezer compartment 5 and the refrigerator compartment 3 of the refrigerator / freezer 1 is normally increased, the cooling operation is started simultaneously with the end of the defrosting mode.

  In such a configuration, the temperature of each chamber is maintained at about 3-4 ° C. for the refrigerator compartment 3 and about 3-6 ° C. for the vegetable compartment 4, and about −18 ° C. to −20 ° C. for the ice making chamber 7 for the freezer compartment 5. It is. Moreover, the storage shelf provided inside the refrigerator compartment door 10 is 5-8 degreeC. The specific low-temperature chamber 13 is a chilled chamber of about 1 ° C. higher than 0 ° C., an ice greenhouse of about 0-1 ° C. lower than 0 ° C. and higher than the freezing temperature of food, It may be a partial freezing chamber at about −4 ° C. so that a thin ice layer is formed on the surface. As described above, the specific low temperature chamber 13 is for cooling and storing food in a specific temperature range, and requires stricter temperature control than other chambers.

  The electric expansion valves 71 and 72 have the same configuration, and one example thereof will be described below with reference to FIG. The electric expansion valves 71 and 72 include a drive valve 120 in a non-magnetic metal valve main body 100, and a stepping motor 102 that opens and closes the drive valve 120 above the valve main body 100. The stepping motor 102 is a general two-phase unipolar stepping motor and has 48 steps per rotation. The driving method is a 1-2 phase excitation method. It consists of a stator 103 and a rotor 110. A non-magnetic sealed case 101 is attached to the upper part of the valve body 100, and a stator 103 of a stepping motor 102 is attached to the outside of the case 101. A rotor 110 of the stepping motor 102 is attached to the inside of the case 101. Is arranged to be rotatable.

  The stator 103 is disposed so as to surround the case 101, and the stator 103 includes a magnetic material yoke 105 and upper and lower coils 107 </ b> A and 107 </ b> B wound around the yoke 105 via a bobbin. It is attached to the case 101 in a state where it is molded. The rotor 110 housed inside the case 101 is a magnetized cylindrical magnetic body (permanent magnet) 111 and a non-magnetic member fitted inside the magnetic body (permanent magnet) 111 and bonded with an adhesive. And a sleeve 112. A bush 113 serving as a bearing for the valve stem 114 is fixed upright on the inner side of the sleeve 112 at the upper portion of the valve body 100, and the valve stem 114 is rotatably inserted into the bush 113. The upper portion of the valve stem 114 passes through the sleeve 112 and is fixed to the sleeve 112 by a nut 116. The sleeve 112 and the bush 113 are connected by a screw coupling portion 115 in which a female screw on the inner surface of the sleeve 112 and a male screw on the outer surface of the bush 113 are engaged.

  The drive valve 120 forms a toilet seat 118 between an inlet passage 119 and an outlet passage 121 formed in the valve body 100, and the valve rod 114 reciprocates up and down corresponding to the toilet seat 118, so that the lower end portion of the valve rod 114 The valve portion 117 performs an opening / closing operation with respect to the toilet seat 118 so as to connect and shut off the inlet passage 119 and the outlet passage 121. The above configuration is the same as that of the electric expansion valves 71 and 72, and the same reference numerals are used for the respective parts.

  In such a configuration, with respect to the electric expansion valve 71, the inlet passage 119 is connected to the inlet side 75A of the refrigerant pipe 75 via the inlet pipe 122, and the outlet passage 121 is connected to the outlet of the refrigerant pipe 75 via the outlet pipe 123. Side 75B is connected. The inlet pipe 122 and the inlet side 75A of the refrigerant pipe 75 constitute the refrigerant inlet side pipe of the electric expansion valve 71, and the outlet pipe 123 and the outlet side 75B of the refrigerant pipe 75 constitute the refrigerant of the electric expansion valve 71. Configure the outlet pipe. As for the electric expansion valve 72, the inlet passage 119 is connected to the inlet side 76A of the refrigerant pipe 76 via the inlet pipe 122, and the outlet passage 121 is connected to the outlet side 76B of the refrigerant pipe 76 via the outlet pipe 123. Has been. The inlet pipe 122 and the inlet side 76A of the refrigerant pipe 76 constitute the refrigerant inlet side pipe of the electric expansion valve 72, and the outlet pipe 123 and the outlet side 76B of the refrigerant pipe 76 constitute the refrigerant of the electric expansion valve 72. Configure the outlet pipe.

  In such a configuration, the pulse signal is supplied from the control circuit device to the coils 107A and 107B of the stator 103, and the rotor 110 rotates stepwise. When a pulse signal in the forward rotation direction is supplied to the coils 107A and 107B of the stator 103, the rotor 110 rotates in the forward direction to close the drive valve 120, and a pulse signal in the reverse rotation direction is applied to the coils 107A and 107B of the stator 103. Is supplied, the rotor 110 rotates in the reverse direction to open the drive valve 120. Specifically, when a pulse signal in the forward rotation direction is supplied to the coils 107 </ b> A and 107 </ b> B of the stator 103, the rotor 110 rotates in the forward direction, and this rotation causes the rotor 110 to move to the bush 113 via the screw coupling portion 115. The valve stem 114 is lowered, and the valve portion 117 moves in a direction in which it abuts against the toilet seat 118. Further, when a pulse signal in the reverse rotation direction is supplied to the coils 107A and 107B of the stator 103, the rotor 110 rotates in the reverse direction, and the rotation causes the rotor 110 and the valve rod to the bush 113 via the screw coupling portion 115. 114 rises and the valve portion 117 moves away from the toilet seat 118.

  In the above, in both the electric expansion valves 71 and 72, the coils 107A and 107B are each configured to be divided into a plurality of phases and applied with a pulse, and the one shown in FIG. Two phases of φ3 are used, and the coil phase of the coil 107B is two phases of φ2 and φ4. As for the application of pulses to the coil phases φ1, φ2, φ3, and φ4 configured as described above, the pulses are applied at timings indicated by ON in the operation steps 1 to 8 in FIG.

  Specifically, the number of pulses supplied from the fully open to the fully open or the fully open to fully closed state of the drive valve 120 is, for example, 480 pulses, and a pulse is applied at each timing indicated by ON in each operation step. As a result, the rotor 110 performs a fine step operation. As shown in FIG. 12, when the pulse signal is applied in one direction so that the operation steps shift to 1, 2, 3, 4, 5, 6, 7, and 8, the operation mode in which the drive valve 120 is opened is shown. On the contrary, when the pulse signal is applied in the reverse direction so that the operation step shifts from 8 to 1, the drive valve 120 is closed. By such an operation, the flow rate of the refrigerant flowing into the first evaporator (cooler) 29 and the second evaporator (cooler) 30 is controlled.

  In the present invention, the drive valve 120 starts from a predetermined position in order to maintain the correct operation of the electric expansion valves 71 and 72. Specifically, when the power is turned on or when the defrosting operation of the evaporators (coolers) 29 and 30 is started, the operation start positions of the electric expansion valves 71 and 72 are set, and the above-described operation is performed based on the detection of the temperature detection sensor. The stepping motor is operated from the predetermined position by the pulse signal supplied by the operation of the control circuit device so that the drive valve 120 is opened and closed. This is referred to as initialization of the start positions of the electric expansion valves 71 and 72. At the time when the stepping motor 102 of the electric expansion valves 71 and 72 starts the stepping operation by this initialization, the fully open position of the drive valve 120 is set. However, in the present invention, in order to obtain a stable operation of the electric expansion valve (drive valve), the closed position (fully closed position) is set.

  Such initialization is performed by supplying a pulse signal in the direction in which the drive valve 120 closes to the stepping motor 102 when the power is turned on or when the defrosting operation of the evaporators (coolers) 29 and 30 is started. Completely closed. This stepping motor 102 is initialized (reference position setting) by a conventionally known method. That is, if an extra pulse signal is supplied more than the normal number of pulses that the drive valve 120 closes so that the stepping motor 102 rotates idly, any of the electric expansion valves 71 and 72 completely drives the drive valve 120. It is certain to be in a closed state. As one of the methods, if a sufficient number of pulses is set so that the drive valve 120 changes from the fully open state to the fully closed state, the defrosting operation of the evaporators (coolers) 29 and 30 starts when the power is turned on. Sometimes this total number of pulses is once supplied to the stepping motor 102 and the drive valve 120 is closed. In this case, if the driving valve 120 is fully opened and the driving valve is closed, an extra pulse signal is supplied from the normal number of pulses for closing the driving valve so that the stepping motor 102 is idled. The drive valve 120 can be in a completely closed state. That is, it can be initialized.

  As described above, when the electric expansion valves 71 and 72 are initialized, the rattling sound directly generated from the electric expansion valves 71 and 72 due to the idling of the stepping motor 102 is not a loud sound and is not a problem. However, due to the rattling vibration transmitted as vibration from the electric expansion valves 71 and 72 to the refrigerator-freezer main body 2 during this initialization, rattling noise is generated from the rattling portion of the refrigerator-freezer main body 2 and the contact portion of the two parts. For this reason, in the present invention, the electric expansion valves 71 and 72 are attached to the refrigerator-freezer main body 2 using rubber covers 90 and 91 made of vibration absorbing members such as butyl rubber as attachments. Thereby, it can prevent that a vibration is transmitted to the refrigerator-freezer main body 2 by these fixtures 90 and 91. FIG. The vibration absorbing member 130 is attached to a refrigerant pipe on the inlet side that is a portion connecting the electric expansion valves 71 and 72 and the refrigerator-freezer main body 2, and the only remaining electric expansion valves 71 and 72 and the refrigerator-freezer main body 2 are attached. The vibration absorbing member 130 is also attached to the refrigerant pipe on the outlet side that is a portion connecting the two. This specific configuration will be described below.

  As described above, the electric expansion valve 71 is attached to the recess on the back surface of the cold air supply passage (cold air duct) 48 with a screw while being covered with the cover 91 made of a vibration absorbing member such as butyl rubber. The rubber cover 91 provides a waterproof effect and attenuates the vibration of the electric expansion valve 71 transmitted to the cold air supply passage (cold air duct) 48 and the subsequent refrigerator-freezer main body 2. The electric expansion valve 72 is attached to the recess on the back surface of the cold air supply passage (cold air duct) 43 with a screw covered with a rubber cover 90 made of a vibration absorbing member such as butyl rubber. The rubber cover 90 provides a waterproof effect and attenuates the vibration of the electric expansion valve 72 transmitted to the cold air supply passage (cold air duct) 43 and the subsequent refrigerator-freezer body 2. For this reason, the rubber covers 90 and 91 attenuate the direct transmission of the sound generated when the stepping motor 102 is idle to the refrigerator-freezer main body 2 but the electric expansion valves 71 and 72. There is a concern that the refrigerant is transmitted to the outside of the refrigerator-freezer 1 through the inlet pipe and the outlet pipe of the refrigerant.

  Therefore, as shown in FIGS. 6 to 9, the vibration absorbing member that attenuates vibrations by flexibility and weight in the refrigerant pipe on the inlet side and the refrigerant pipe on the outlet side of the electric expansion valves 71 and 72. 130 is attached. In order to achieve a silencing effect, the vibration absorbing member 130 is attached to the refrigerant pipe 75A on the inlet side of the refrigerant pipe 75 on the refrigerant inlet side of the electric expansion valve 71, and the refrigerant pipe 75 on the outlet side of the electric expansion valve 71. The vibration absorbing member 130 is attached to the refrigerant pipe 75B on the outlet side. In order to make the noise reduction effective, a U-shaped bent portion 131 or a loop-shaped bent portion 132 is formed in the middle of the refrigerant pipe 75A on the inlet side and the refrigerant pipe 75B on the outlet side of the refrigerant pipe 75 to Transmission of vibration to the refrigerant inlet side and outlet side of the expansion valve 71 is attenuated. And the vibration absorption member 130 which absorbs a vibration with a softness | flexibility and weight is attached to this bending part 131 or 132. FIG. The vibration absorbing member 130 is made of a rubber material such as butyl rubber. As shown in FIGS. 13 and 14, the vibration absorbing member 130 is connected to each other with the other end 130B open at one end 130A and the adhesive 140 applied to the opposing surface. It is formed with a pair of sandwiching sides 130P and 130Q. By attaching the pair of holding sides 130P and 130Q in a state where the U-shaped bending portion 131 or the loop-like bending portion 132 is held between the pair of holding sides 130P and 130Q, the attachment is easy. It can be stably held by the bending portion 131 or 132 and the desired silencing effect can be achieved.

  Also, the refrigerant pipe 76A on the inlet side and the refrigerant pipe 76B on the outlet side of the electric expansion valve 72 vibrate similarly to the refrigerant pipe 75A on the refrigerant inlet side and the refrigerant pipe 75B on the outlet side of the electric expansion valve 71. The absorption member 130 is attached, and the refrigerant pipe 76A on the inlet side and the refrigerant pipe 76B on the outlet side are similar to the refrigerant pipe 75A on the inlet side and the refrigerant pipe 75B on the outlet side. A U-shaped bent portion 131 or a loop-shaped bent portion 132 is formed in the middle of the refrigerant pipe 76B so as to attenuate the transmission of vibrations to the refrigerant inlet side and outlet side of the electric expansion valve 72. ing. And the vibration absorption member 130 which absorbs a vibration with a softness | flexibility and weight is attached to this bending part 131 or 132. FIG. The vibration absorbing member 130 is made of a rubber material such as butyl rubber and has the same configuration as described above.

  In the present invention, as another embodiment, a humidification operation (a general cycle defrost operation) of the refrigerator compartment 3, the vegetable compartment 4, and the specific low temperature compartment 13 will be described with reference to FIGS. In this case, the glass tube heater 34 for defrosting which forcibly defrosts the second evaporator (cooler) 30 is not provided. In a state where the freezer compartment 5 or the first evaporator (cooler) 29 is not cooled to a predetermined lower limit temperature, the compressor 24 and the blower 31 are operated (ON), and in this state, the refrigerator compartment 3 or the refrigerator compartment is operated. When the second evaporator (cooler) 30 serving as the room cooler is lowered to a predetermined temperature by cooling, the electric expansion valve 72 is closed by the control circuit device, and the second evaporator (cooler) 30 is moved to. Blocks the refrigerant inflow. In the first embodiment, the blower 32 is stopped (OFF), but in the second embodiment, the blower 32 is operated (ON). Since the air in the refrigerator compartment 3, the vegetable compartment 4, and the specific low temperature compartment 13 circulates through the second evaporator (cooler) 30 by the operation (ON) of the blower 32, the temperature of these compartments increases. The frost adhering to the second evaporator (cooler) 30 gradually melts. Since this molten water circulates to the refrigerator compartment 3, the vegetable compartment 4, and the specific low temperature compartment 13 by the air blower 32, the humidification effect of these rooms is obtained. This is a humidification operation (general cycle defrost operation). By this humidification operation, the refrigerator compartment 3, the vegetable compartment 4, and the specific low temperature compartment 13 contain moderate humidity and moisturize the articles stored there.

  When performing this humidification operation, initialization of the electric expansion valve 71 may be performed when the power is turned on and when the defrosting operation of the evaporator (cooler) 29 is started, as in the first embodiment. Since the defrosting operation of the electric expansion valve 72 as in 1 is not performed, the initialization of the electric expansion valve 72 does not need to be performed at the start of the defrosting operation of the evaporator (cooler) 29, and is performed when the power is turned on. Just do it. Further, as in the first embodiment, the vibration absorbing member 130 that attenuates the vibration by the flexibility and the weight is provided in both or one of the refrigerant pipe on the refrigerant inlet side and the refrigerant pipe on the outlet side of the electric expansion valves 71 and 72. Can be attached.

  Although each said Example is a refrigerator-freezer which has the refrigerator compartment 3, the freezer compartment 5, the vegetable compartment 6, etc., this invention is applicable to the refrigerator of various forms, The form of a refrigerator is not restricted to this. The present invention is effective when applied to various refrigerators within the technical scope of the present invention. As is clear from the above, the technique of the present invention is an evaporator for cooling the inside of the refrigerator after the carbon dioxide refrigerant compressed by the compressor is radiated by the radiator and then depressurized by the electric expansion valve. A refrigerant circuit that evaporates in the (cooler) and returns to the compressor of the compressor, and the electric expansion valve is a stepping motor system in which the drive valve opens and closes the refrigerant passage by a pulse signal energized to the coil. In the refrigeration apparatus, a vibration absorbing member that attenuates vibration is attached to both or one of the refrigerant inlet side pipe and the outlet side pipe of the electric expansion valve. Thus, the present invention is effective when applied to a refrigerator provided with a refrigeration circuit using a carbon dioxide refrigerant.

It is a front view of the present invention refrigerator-freezer. Example 1 It is explanatory drawing which looked at the refrigerator-freezer main body of this invention from the front. Example 1 It is a vertical side view of this invention refrigerator-freezer. Example 1 1 is a circuit block diagram of a refrigeration apparatus according to the present invention. Example 1 It is explanatory drawing of the refrigerant | coolant flow path of the freezing apparatus which concerns on this invention. Example 1 The front view which shows the connection of the electric expansion valve which concerns on this invention, and the evaporator (cooler) for freezer (Example 1) FIG. 7 is a side view of FIG. 6. Example 1 It is a front view which shows the connection of the electric expansion valve which concerns on this invention, and the evaporator (cooler) for refrigerator compartment. Example 1 It is a side view of FIG. Example 1 It is sectional drawing which shows the structure of the electrically driven expansion valve which concerns on this invention. Example 1 It is explanatory drawing which shows the relationship of the coil phase of the stepping motor of the electrically driven expansion valve which concerns on this invention. Example 1 It is operation | movement explanatory drawing which shows the relationship between the opening / closing operation | movement of the drive valve of the electrically driven expansion valve which concerns on this invention, and energization of the coil phase of FIG. Example 1 It is the perspective view which attached the vibration absorption member which concerns on this invention to the loop-shaped part of the refrigerant | coolant pipe. Example 1 It is the perspective view which attached the vibration absorption member which concerns on this invention to the U-shaped part of the refrigerant | coolant pipe. Example 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigeration refrigerator 2 ... Refrigeration refrigerator main body 3 ... Refrigeration room 4 ... Vegetable room 5 ... Freezing room 6 ... Ice making room 7 ... Automatic ice making machine 9 ... Water supply container 24..Electric compressor 24A..First stage compression section 24B..Second stage compression section 25..Radiator 29..First evaporator (cooler)
30 ・ ・ Second evaporator (cooler)
31..First fan 32..Second fan 43..Cool air passage (cold air duct)
48 .. Cold air passage (cold air duct)
70 .. Dehydrator 71.. First electric expansion valve 72.. Second electric expansion valve 75... First refrigerant pipe 75 A .. First refrigerant pipe inlet side refrigerant pipe 75 B. Outlet side refrigerant pipe 76... Second refrigerant pipe 76 A... Second refrigerant pipe inlet side refrigerant pipe 76 B... Second refrigerant pipe outlet side refrigerant pipe 77 ... Check valve 90 ... Rubber cover 91 ... Rubber cover 100 ... Valve body 101 ... Sealing case 102 ... Stepping motor 103 ... Stator 110 ... Rotor 114 ... Valve rod 120 ... Drive valve 130 ... Vibration absorbing member 130P, 130Q ...・ ・ A pair of sandwiching sides 131 ・ ・ U-shaped bent portion 132 ・ ・ Loop-shaped bent portion

Claims (3)

  After the carbon dioxide refrigerant compressed by the compressor is dissipated by the radiator, it evaporates by an evaporator (cooler) for cooling the inside of the refrigerator through the electric expansion valve, and goes to the compression section of the compressor The electric expansion valve is configured to return, and the electric expansion valve further includes a normal pulse number in which the driving valve opens and closes the refrigerant passage and the driving valve closes in the direction in which the driving valve is closed by a pulse signal energized to the coil. It is a stepping motor system that supplies an extra pulse signal for initialization, and refrigerant pipes are connected to the refrigerant inlet side and outlet side of the electric expansion valve, respectively, and the inlet side refrigerant pipe and outlet side refrigerant A refrigeration apparatus comprising a vibration absorbing member attached to both or one of pipes.   After the carbon dioxide refrigerant compressed by the compressor is dissipated by the radiator, it evaporates by an evaporator (cooler) for cooling the inside of the refrigerator through the electric expansion valve, and goes to the compression section of the compressor The electric expansion valve is configured to return, and the electric expansion valve further includes a normal pulse number in which the driving valve opens and closes the refrigerant passage and the driving valve closes in the direction in which the driving valve is closed by a pulse signal energized to the coil. It is a stepping motor system that supplies an extra pulse signal for initialization, and refrigerant pipes are connected to the refrigerant inlet side and outlet side of the electric expansion valve, respectively, and the inlet side refrigerant pipe and outlet side refrigerant A refrigeration apparatus characterized in that a U-shaped or looped bent portion is formed in the middle of both or one of the pipes, and a vibration absorbing member is attached to the bent portion.   The said vibration absorption member is comprised with the rubber material which pinches | interposes both or one of the said inlet side refrigerant | coolant pipe and the said outlet side refrigerant | coolant pipe by a pair of clamping edge | sides mutually adhere | attached. 2. The refrigeration apparatus according to 2.

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