JP2012087947A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator that can optimize cycle efficiency by controlling a flow rate of a refrigerant by means of a valve.SOLUTION: The cross section of an inner diameter of an R capillary tube 13 in a refrigerating cycle 50 is equal to or larger than an opening area at the maximum opening of an R outlet 32R of a three-way valve 11.

Description

  Embodiments of the present invention relate to refrigerators.

  Conventionally, the flow rate of the refrigerant flowing in the refrigeration cycle used in the refrigerator is adjusted by the inner diameters of the solenoid valve and the capillary tube. Although the optimum diameter of this capillary tube theoretically changes due to fluctuations in the heat load on the refrigerator, etc., the inside diameter of the capillary tube cannot be made variable, so that the inside diameter of the capillary tube can be optimized for low cycle operation. Is designed. The cycle efficiency is optimized by connecting a solenoid valve to the capillary tube and adjusting the opening degree of the valve outlet of the solenoid valve.

JP 2005-2145045 A

  However, if the cross-sectional area of the inner diameter of the capillary tube is smaller than the opening area of the maximum opening of the solenoid valve, even if the valve outlet of the solenoid valve is at the maximum opening during high load operation, the capillary tube Since the cross-sectional area of the inner diameter is smaller than the opening area of the maximum opening, there is a problem that it is not possible to completely adjust the refrigerant flow rate optimally for the throttle of the refrigerant flow rate.

  In view of the above problems, an object of the present invention is to provide a refrigerator capable of optimizing cycle efficiency by adjusting the refrigerant flow rate by a valve member.

  An embodiment of the present invention includes a compressor, a condenser, a valve member capable of adjusting a flow rate of refrigerant flowing from the condenser according to an opening degree of a valve outlet, a capillary tube connected to the valve outlet of the valve member, and the capillary An evaporator connected to the tube, and a cross-sectional area of the inner diameter of the capillary tube is equal to or larger than the opening area of the maximum opening of the valve outlet of the valve member, It is the refrigerator characterized by this.

It is a longitudinal cross-sectional view of the refrigerator of Example 1 of this invention. It is a figure of the refrigerating cycle of a refrigerator. It is the perspective view seen from the back of a machine room. It is explanatory drawing of a three-way valve. It is a block diagram of a refrigerator. It is a figure of the refrigerating cycle of the refrigerator of Example 2.

  Hereinafter, the refrigerator of embodiment of this invention is demonstrated based on drawing.

  Hereinafter, the refrigerator 1 of Example 1 of this invention is demonstrated based on FIGS.

(1) Structure of refrigerator 1 The structure of the refrigerator 1 is demonstrated based on FIG.

  As shown in FIG. 1, the cabinet 100 of the refrigerator 1 has a storage space formed inside a heat insulation box, and is insulated from a freezer compartment 201, an ice making room 202, and a small freezer compartment by a horizontal heat insulation partition wall. The storage room is divided into a plurality of storage rooms such as a freezing compartment (hereinafter referred to as “F compartment”) 2, a refrigerated compartment 301, and a refrigerated compartment (hereinafter referred to as “R compartment”) 3. The small freezer compartment is arranged beside the ice making chamber 202.

  A hinge-type door 301a is arranged on the front surface of the refrigerator compartment 301, and drawer-type doors 302a, 201a, 202a are arranged in the vegetable room 302, the freezer room 201, the ice making room 202, and the small freezer room, respectively. .

  In addition, a control board incorporating the control unit 102 is disposed on the back surface of the cabinet 100, and a plurality of switches, a display unit, and an outside air temperature sensor for operating the control unit 102 are disposed on the front surface of the door 301a of the refrigerator compartment 301. An operation panel 104 having 105 is provided.

  At the rear of the cabinet 100, a refrigeration evaporator (hereinafter referred to as “F EVA”) 4 that is a refrigeration evaporator for cooling the F section 2, and a refrigeration blower fan for circulating the cold air in the F section 2 (Hereinafter referred to as “F fan”) 6, a refrigeration evaporator (hereinafter referred to as “R EVA”) 5, which is a refrigeration evaporator for cooling the R section 3, and cold air in the R section 3. Refrigeration blow fans (hereinafter referred to as “R fans”) 7 are provided. Each storage room is cooled and held at a predetermined set temperature by F-evapor 4, R-eve 5, F-fan 6 and R-fan 7, respectively. It is cooled by the refrigerant supplied from a compressor (compressor) 9 installed in the machine room 8.

  An R sensor 106 for detecting the internal temperature of the R compartment 3 is arranged on the back surface of the refrigerator compartment 301, and an F sensor 108 for detecting the internal temperature of the F compartment 2 is arranged on the back surface of the refrigerator compartment 201. Yes.

(2) Configuration of Refrigeration Cycle 50 Next, the configuration of the refrigeration cycle 50 of the refrigerator 1 will be described with reference to FIG.

  As shown in FIG. 2, the refrigeration cycle 50 includes a compressor 9 that discharges high-temperature and high-pressure refrigerant gas, a condenser (condenser) 10 that receives the refrigerant gas discharged from the compressor 9 and liquefies heat, and an outlet of the condenser 10. Refrigeration capillary tube (a refrigeration decompression device, hereinafter referred to as “F”) as a throttling means for the three-way valve 11, F EVA 4, R EVA 5, F EVA 4 and R EVA 5 that are provided on the side and switches the refrigerant flow path. A refrigeration capillary tube (hereinafter referred to as “R capillary tube”) 13, and a check valve 14.

  The three-way valve 11, which is one of the valve members, functions as an expansion valve that is provided on the outlet side of the condenser 10 and that can control the flow rate of the refrigerant together with the switching of the refrigerant flow path to the F-eva 4 and the R-eva. The compressor 9, the condenser 10 and the three-way valve 11 are connected in series, and the F capillary tube 12, the F EVA 4 and the check valve 14 are connected in series to the freezing side outlet (hereinafter referred to as “F outlet”) of the three-way valve 11. The R capillary tube 13 and the R EVA 5 are connected in series to the refrigeration side outlet (hereinafter referred to as “R outlet”) of the three-way valve 11. The pipe connected to the outlet side of the check valve 14 and the pipe connected to the outlet side of the R EVA 5 merge and are connected to the compressor 9 as a suction pipe (suction pipe) 15. Therefore, the low temperature side F EVA 4 connected from the F outlet of the three-way valve 11 via the F capillary tube 12, and the high temperature side R EVA 5 connected from the R outlet of the three way valve 11 via the R capillary tube 13. Are connected in parallel. The F capillary tube 12 and the R capillary tube 13 are embedded in a heat insulating material (urethane) constituting the cabinet 100 in a state of being soldered so as to constitute a suction pipe 15 and a counterflow heat exchanger.

  The F EVA 4 is provided with an F EVA sensor 110 that detects its temperature, and the R EVA 5 is provided with an R EVA sensor 112 that detects its temperature.

(3) Structure of the machine room 8 Next, the structure of the machine room 8 is demonstrated based on FIG.

  As shown in FIG. 3, the compressor 9 installed in the machine room 8 is attached to the right side of the comp base 16 provided over the width direction of the cabinet 100 via an elastic member. On the left side of the compressor base 16, a radiating fan (hereinafter referred to as “C fan”) 18, a condenser 10, and an evaporating dish 19 for evaporating defrost water are installed. The C fan 18 is attached to the fan casing 20 and is arranged so that the axial flow is in the front-rear direction of the machine room 8. As shown in FIG. 4, an air inlet 21 for outside air is opened in the compressor base 16 in front of the lower end of the fan casing 20 along the width of the fan casing 20. The capacitor 10 is disposed behind the C fan 18 with its lower end facing the C fan 18. The capacitor 10 is erected along a recess 22 formed on the back surface of the cabinet 100 and extending upward from the machine room 8.

(4) Structure of the three-way valve 11 Next, the three-way valve 11 of the refrigeration cycle 50 will be described with reference to FIG.

  As shown in FIG. 4, the three-way valve 11 has a valve seat 32 provided at the bottom of the valve case 31 and a valve body 33 disposed on the upper portion of the valve seat 32.

  The valve seat 32 is formed with an R outlet 32R through which the refrigerant flows to the R EVA 5 side, an F outlet 32F from which the refrigerant flows to the F EVA 4 side, and an inlet 34 through which the refrigerant flows from the condenser 10.

  The valve body 33 is disposed at the upper part of the valve seat 32 so as to cover the R outlet 32R and the F outlet 32F formed in the valve seat 32, and is rotated so that the angle can be controlled by a pulsed stepping motor (not shown). The In the valve body 33, an R groove 33R and an F groove 33F are formed on the lower surface of the thick step portion 33b with different distances from the rotation shaft 33a and shifted positions in the circumferential direction.

  The valve element 33 is rotated by a predetermined angle in a predetermined direction (clockwise direction indicated by an arrow K in FIG. 5 in this embodiment) by the stepping motor, so that the R groove 33R and the R outlet 32R or the F groove 33F. The F outlet 32F overlaps and communicates with each other in the upper and lower directions, and neither the F outlet 33R nor the R outlet 33F overlaps with the F outlet 32R or R outlet 32F, and the F outlet 32R or F outlet 32F is closed by the valve body 33.

  When the R groove 33R and the R outlet 32R communicate with each other, the refrigerant flowing into the valve case 31 from the inlet 34 enters the R groove 33R from the open end of the thick step portion 33b and flows out from the R outlet 32R. Then, it is introduced into the R capillary tube 13 and the R evaporator 5.

  When the F groove 33F and the F outlet 32F communicate with each other, the refrigerant flowing into the valve case 31 from the inlet 34 enters the F groove 33F from the open edge of the thick step portion 33b and flows out from the F outlet 32F. Then, it is introduced into the F capillary tube 12 and the F EVA 4.

  When the F outlet 32F and the R outlet 32R are closed by the thick step portion 33b of the valve body 33, the supply of the refrigerant to the F EVA 4 and the R EVA 5 is blocked.

  Further, the R groove 33R is formed so that the cross-sectional area gradually increases from the front end to the rear end in the rotational direction, and the R groove 33R is controlled by controlling the rotation angle of the valve body 33 by a stepping motor. And the area where the R outlet 32R overlaps can be changed. Thereby, the flow rate of the refrigerant supplied to the R evaporator 5 by adjusting the opening degree of the R outlet 32R can be adjusted from fully closed to fully opened.

  Also, the F groove 33F is formed so that the cross-sectional area gradually increases from the front end to the rear end in the rotational direction, similarly to the R groove 33R, and the rotation angle of the valve element 33 is controlled by the stepping motor. By doing so, it is possible to adjust the opening of the F outlet 32F and adjust the flow rate of the refrigerant supplied to the F EVA 4 from fully closed to fully open.

  Further, when the opening area of the maximum opening of the R outlet 32F of the three-way valve 11 is compared with the sectional area of the inner diameter of the R capillary tube 13, the sectional area of the inner diameter of the R capillary tube 13 is the maximum of the R outlet 32R. The opening area is larger than or equal to the opening area. When comparing the opening area of the F opening 32F with the maximum opening and the sectional area of the inner diameter of the F capillary tube 12, the sectional area of the inner diameter of the F capillary tube 12 is the opening area of the F opening 32F with the maximum opening. Larger than or the same. Further, when the inner diameter of the R capillary tube 13 and the inner diameter of the F capillary tube 12 are compared, the inner diameter of the R capillary tube 13 is formed larger than the inner diameter of the F capillary tube 12.

  The three-way valve 11 is not limited to the valve member that operates by the stepping motor as described above, but may be an electromagnetic valve that electromagnetically controls the opening degree of the two valve outlets.

(5) Electrical configuration of refrigerator 1 Next, the electrical configuration of the refrigerator 1 will be described based on the block diagram of FIG.

  As shown in FIG. 5, the control unit 102 provided on the control board is configured by a microcomputer, and is connected to the motor of the compressor 9, the R fan 7, the F fan 6, and the C fan 18. Further, the operation panel 104 provided on the door 301a of the refrigerator compartment 301, the outside air temperature sensor 105 provided on the operation panel 104, the stepping motor of the three-way valve 11, the R sensor 106, the F sensor 108, the R EVA sensor 112, and the F EVA sensor 110. Is also connected.

(6) Cooling mode In the refrigerator 1 having the above configuration, the control unit 102 steps the three-way valve 11 based on the internal temperature detected by the R sensor 106 and the F sensor 108 provided in the F section 2 and the R section 3. A refrigeration cooling mode (hereinafter referred to as “R mode”) that cools the R section 3 by causing the refrigerant to flow only through the R evaporator 5 by controlling the opening degree of the F outlet 32R and the R outlet 32F by rotating the motor. And the freezing cooling mode (henceforth "F mode") which cools F division 2 by flowing a refrigerant only to F EVA 4 is performed.

  When the control unit 102 executes the F mode, for example, when food is put in the freezer compartment 201 and the inside temperature detected by the F sensor 108 is equal to or higher than a predetermined temperature, the F mode is executed. . Moreover, food is put in the refrigerator compartment 301, and the R mode is executed when the internal temperature detected by the R sensor 106 is equal to or higher than a predetermined temperature. The control unit 102 executes the R mode or the F mode depending on the detected temperatures of the R and F sensors 112 and 110.

  When the control unit 102 flows the refrigerant with the R outlet 32R having the maximum opening degree in the R mode, the sectional area of the inner diameter of the R capillary tube 13 is equal to or larger than the opening area of the maximum opening degree of the R outlet 32R. Therefore, the refrigerant flow rate can be made to depend only on the opening degree of the R outlet 32R without the refrigerant flow rate being limited by the R capillary tube 13, and the cycle efficiency of the refrigeration cycle 50 can be optimized by adjusting the three-way valve 11. Can only be done.

  Further, when the control unit 102 flows the refrigerant with the F outlet 32F having the maximum opening degree in the F mode, the sectional area of the inner diameter of the F capillary tube 12 is the same as the opening area of the F opening 32F, or Since it is more than that, the refrigerant flow rate can be adjusted only by the opening degree of the F outlet 32F without being limited by the F capillary tube 12.

  Therefore, the control unit 102 controls the opening degree of the two valve outlets 32R and 32F of the three-way valve 11 in real time according to the internal temperature detected by the R sensor 106, the F sensor 108, the R EVA sensor 112, and the F EVA sensor 110. , Cycle efficiency can be adjusted in real time and optimization can be performed.

(7) Effect Since the cross-sectional area of the inner diameter of the R capillary tube 13 is equal to or larger than the opening area of the maximum opening of the R outlet 32R in the refrigerator 1 having the above configuration, the F outlet 32F Since the opening area of the maximum opening is equal to or larger than the cross-sectional area of the inner diameter of the F capillary tube 12, the cycle efficiency of the refrigeration cycle 50 can be improved by adjusting the opening of the R outlet 32R and the F outlet 32F. Optimization can be performed.

  Further, by adjusting in real time the temperature fluctuation of the refrigerator 1 by the internal temperature detected by the R sensor 106, F sensor 108, R EVA sensor 112, and F EVA sensor 110, the cycle efficiency can be optimized in real time. it can.

  Further, since the inner diameter of the R capillary tube 13 is larger than the inner diameter of the F capillary tube 12, a larger refrigerant flow rate than that of the F EVA can be flowed to the R EVA 5.

  The refrigerator 1 of Example 2 of this invention is demonstrated based on FIG.

  In the first embodiment, the refrigeration cycle 50 provided with the two evaporators of the F evaporator 4 and the R evaporator 5 has been described. However, in the present embodiment, one evaporator (hereinafter simply referred to as “eva”) 52 is provided. Is the case.

  As shown in FIG. 6, the refrigeration cycle 50 of the present embodiment includes a compressor 9, a condenser 10, an electromagnetic valve 54, a capillary tube 56, and an evaporator 52, which are one of valve members that are refrigerant flow rate adjustment devices, and a compressor. The refrigerant circulates in 9.

  In this case, the cross-sectional area of the inner diameter of the capillary tube 56 is designed to be the same as or larger than the opening area of the maximum opening of the valve outlet of the electromagnetic valve 54.

  Therefore, when the evaporator 52 is cooled, even if the valve outlet of the electromagnetic valve 54 is set to the maximum opening degree and the refrigerant flows, the cycle efficiency is optimized only by the electromagnetic valve 54 without being restricted by the capillary tube 56. be able to.

Example of change

  In the refrigerator of the embodiment according to claim 1, since the cross-sectional area of the inner diameter of the capillary tube is equal to or larger than the opening area of the maximum opening of the valve outlet of the valve member, the valve outlet of the valve member Thus, the refrigerant flow rate can be adjusted only by the opening degree, and the cycle efficiency of the refrigeration cycle can be optimized.

  In the refrigerator of the embodiment according to claim 2, since the cross-sectional areas of the inner diameters of the two capillary tubes are equal to or larger than the opening area of the maximum opening of each valve outlet in the three-way valve, the three-way The refrigerant flow rate can be adjusted only by controlling the valve, and the cycle efficiency of the refrigeration cycle can be achieved.

  In the refrigerator according to the embodiment of the third aspect, since the inner diameter of the refrigeration capillary tube is equal to or larger than the inner diameter of the refrigeration capillary tube, a larger refrigerant flow rate can flow to the refrigeration evaporator than the refrigeration evaporator.

  Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1 ... Refrigerator, 2 ... F compartment, 3 ... R compartment, 4 ... F EVA, 5 ... R EVA, 6 ... F fan, 7 ... R fan, 8. .. Machine room, 9 ... Compressor, 11 ... 3-way valve, 12 ... F capillary tube, 13 ... R capillary tube, 32R ... R outlet, 32F ... F outlet, 50 ..Refrigeration cycle

Claims (3)

A compressor,
A capacitor,
A valve member capable of adjusting the flow rate of refrigerant flowing from the condenser according to the opening degree of the valve outlet;
A capillary tube connected to the valve outlet of the valve member;
An evaporator connected to the capillary tube;
Having a refrigeration cycle comprising
The cross-sectional area of the inner diameter of the capillary tube is equal to or larger than the opening area of the maximum opening of the valve outlet of the valve member,
A refrigerator characterized by that. A refrigeration evaporator for cooling the refrigeration compartment of the main body of the refrigerator is connected to the refrigeration capillary tube,
A freezing evaporator for cooling the freezing compartment of the main body is connected to the freezing capillary tube,
The valve member is a three-way valve, the refrigeration capillary tube is connected to a first valve outlet of the three-way valve, and the refrigeration capillary tube is connected to a second valve outlet of the three-way valve;
The cross-sectional area of the inner diameter of the capillary tube for refrigeration and the cross-sectional area of the inner diameter of the capillary tube for refrigeration are equal to or larger than the opening area of each maximum opening of each valve outlet of the three-way valve,
The refrigerator according to claim 1. An inner diameter of the refrigeration capillary tube is formed larger than an inner diameter of the refrigeration capillary tube.
The refrigerator of Claim 2 characterized by the above-mentioned.

Images