JP4033167B2 - Freezer refrigerator - Google Patents

Description

  The present invention relates to a refrigerator-freezer having a freezer cooler and a refrigerator freezer, and having a switching valve for distributing condensed refrigerant to each cooler.

  FIG. 17 shows the structure of a conventional refrigerator-freezer equipped with refrigerators for freezer compartments and refrigerator compartments. In the figure, 1 is a compressor, 2 is a condenser, 3 is a three-way switching valve, 4a is a capillary for a refrigerator compartment, 4b is a capillary for a freezer compartment, 5a is a refrigerator for a refrigerator compartment, 5b is a cooler for a refrigerator compartment, 6 Is a check valve, 7a is a defrosting heater for the refrigerator compartment cooler, 7b is a defrosting heater for the freezer compartment cooler, 8a is a fan for the refrigerator compartment, 8b is a fan for the freezer compartment, 9 is a box, 10 is a dryer, and 11 is a refrigerator compartment. , 12 is a chilled room, 13 is a vegetable room, 14 is an ice maker, 15 is a freezer upper case, 16 is a freezer lower case, 17 is a freezer fan grill, and 18 is a refrigerator cold fan grill.

  Next, the operation of the conventional refrigerator-freezer will be described. The refrigerant is compressed by the compressor 1, enters the condenser 2, passes through the dryer 10, and reaches the three-way switching valve 3. Here, each thermistor (not shown) attached to the freezer compartment fan grill 17 and the refrigerator compartment fan grill 18 controls the three-way switching valve 3 of each flow path and sends it to the room coolers 5a and 5b. . The role of the conventional three-way switching valve 3 is simply the function of switching the flow path. Further, between the three-way switching valve 3 and each refrigerator compartment cooler 5a and freezer compartment cooler 5b, there are a first capillary tube 4a and a second capillary tube 4b which are throttle devices having different inner diameters. 5a, the freezer cooler 5b is set to a predetermined evaporation temperature.

  18 and 19 are refrigerant circuit diagrams of a refrigerator-freezer equipped with a conventional refrigerator for a freezer compartment and a refrigerator compartment. Here, the thing provided with the three-way switching valve as a switching valve is demonstrated. In FIG. 18, 1 is a compressor, 2 is a condenser, and 3 is a three-way switching valve, which is provided with a first outlet 3a connected to the freezer compartment capillary and a second outlet 3b connected to the refrigerator compartment capillary. 4a is a capillary for a refrigerator compartment, 4b is a capillary for a freezer compartment, 5a is a refrigerator for a refrigerator compartment, 5b is a cooler for a refrigerator compartment, 6 is a check valve, and an arrow indicates the flow direction of the refrigerant.

  Further, as shown in FIG. 19, the outlet of the refrigerator for cooler 5a may be connected to the inlet of the cooler for freezer 5b (in front of the capillary for freezer 4b). This is because the refrigerant returned to the compressor 1 is passed through the freezer cooler 5b and completely evaporated to prevent liquid back.

  In FIG. 18, the refrigerant discharged from the compressor 1 is condensed by the condenser 2 and supplied before the three-way switching valve 3. Regarding the operation of the compressor 1, its start and stop are determined by the F or R thermistor, and its start speed is determined by the outside air temperature, and the rotational speed is increased with the subsequent continuous operation time.

  The flow path switching is determined, and the refrigerant is supplied to the refrigerator for cooler 5a or the refrigerator for freezer 5b, and the interior is cooled by evaporating it. When the R thermistor reaches the closing point of the three-way switching valve 3, the three-way switching valve is controlled, the second outlet 3b is closed, the refrigerator fan is stopped, and the cooling of the refrigerator is stopped.

  FIG. 20 shows a control flowchart of the compressor, each thermistor, and the three-way switching valve at this time. In FIG. 20, first, the operation state of the compressor is confirmed in step S1, and if it is ON, the process proceeds to step S2. In step S2, the internal temperature is confirmed by the F thermistor to determine whether or not cooling is necessary. If it is OFF, in step S6, the internal temperature is confirmed by the F thermistor to determine whether or not cooling is necessary. If the F thermistor confirmation temperature is equal to or higher than T2 in step S6, the process proceeds to step S7, and COMP is turned on. If it is equal to or lower than T2, the process proceeds to step S8, and COMP is turned off. If the F thermistor confirmation temperature in step S2 is equal to or higher than T1 and cooling is required, the process proceeds to step S3. If the F thermistor confirmation temperature is equal to or lower than T1, the first outlet 3a of the three-way selector valve 3 is set in step S9. The second outlet 3b is closed and COMP is turned OFF in step S10. When the second outlet 3b side of the three-way switching valve 3 is controlled in step S3 and the flow path is opened so that the refrigerant flows into the freezer cooler 5b, cooling in the R thermistor is necessary in step S4. If cooling is necessary at T3 or higher, the process proceeds to step S5, and the second outlet 3b side of the three-way switching valve 3 is controlled in the same manner as in step S3, so that the freezer cooler 5b Control is performed to open the flow path so that the refrigerant flows through the pipe. As each channel is opened, each fan is operated to send cooled air. When cooling is unnecessary at T3 or less, the process proceeds to step S11, and the first outlet 3a side of the three-way switching valve 3 is closed.

  FIG. 21 is a time chart showing the time-series movement of each element when the outside air is 18 ° C. In FIG. 21, the starting rotation speed of each element is determined by the outside air thermistor, and the compressor 1 is controlled by the F thermistor. At that time, also in the three-way switching valve, the opening and closing of the flow path is determined by switching the valve by the signals of the F and R thermistors.

  FIG. 22 is a startup rotation speed table of each element (compressor 1, freezer compartment fan 8b, refrigerator compartment fan 8a) with respect to the outside air temperature of a conventional refrigerator-freezer. In the figure, N COMP is the compressor, NF FAN is the refrigerating room fan, and NR FAN is the revolving room fan starting speed.

  In the figure, N COMPrpm “40”, NR FANrpm “1000”, NF FANrpm “1000”, and NCOMrpm “50” and NR FANrpm “1100” when the outside air temperature is 15 ° C. to 20 ° C. ”, NF FANrpm“ 1150 ”, outside air temperature 20 ° C. to 25 ° C., N COMPrpm“ 55 ”, NR FANrpm“ 1200 ”, NF FANrpm“ 1200 ”, and outside air temperature 25 ° C. to 30 ° C. If N COMPrpm “60”, NR FANrpm “1200”, NF FANrpm “1250” and the outside air temperature is 30˜, NCOMrpm “65”, NR FANrpm “1300”, and NF FANrpm “1300”.

  However, in these refrigeration cycles, the opening degree of the three-way switching valve 3 is constant, that is, either fully open or fully closed, and the flow rate is controlled by the capillaries 4a and 4b connected thereafter.

  In the case of a conventional refrigerator-freezer, the refrigerant flow rate supplied to the cooler is determined by the compressor rotation speed and the capillary diameter, but the flow rate control means is only one capillary tube for each cooler.

  The valve control flow rate is fixed when the flow rate of refrigerant is large for high outside air and internal load fluctuations (door opening / closing, food load, etc.), so it can only be controlled within the compressor speed range. In some cases, the cooling capacity is insufficient due to gas shortage in the cooler.

  Also, at low loads, even if it is attempted to reduce the refrigerant flow rate in order to reduce power consumption, the valve control flow rate is fixed, so that it can be controlled only within the compressor speed range. In some cases, the refrigerant flowed more than the limit refrigerant flow rate and the cooling capacity was too large.

  And, if the optimal refrigerant flow rate is set at high load, the cooling capacity is too large at low load, and conversely, if the optimal refrigerant flow rate is set at low load, gas will be insufficient at high load. The conventional refrigeration cycle was designed in such a way as to be intermediate between the two, and the flow rate optimum value of both was not satisfied at the same time.

  As described above, in the refrigeration cycle of the conventional refrigerator-freezer, the refrigerant flow rate control can be performed only by the rotation speed of the compressor, and there is a problem of configuring a refrigeration cycle having an optimum flow rate with respect to a variable load.

The present invention has been made to solve the above-described problems, is inexpensive, and appropriately adjusts the amount of refrigerant supplied to each cooler over a wide range, thereby preventing fluctuations in high outside air and in-chamber load fluctuations. The purpose is to provide a refrigerator-freezer with a sufficient cooling capacity and reduced power consumption to the market.

The refrigerator-freezer according to the present invention is a refrigerator-freezer provided with a refrigerator for a refrigerator compartment and a refrigerator for a refrigerator compartment, and has one inlet channel and at least three outlet channels, and the at least three outlet channels are provided. The freezer compartment cooler and the refrigerating room cooler are connected to distribute the condensed refrigerant, and the freezer compartment cooler has two outlet channels whose opening degree can be controlled in a plurality of stages. A switching valve to be connected; and a temperature detecting means for detecting temperatures of the outlet and inlet of the freezer cooler, wherein a temperature difference between the outlet and the inlet of the refrigerator freezer is _tie , a first predetermined value When the value is a and the second predetermined value is b (a <b), the refrigeration is performed so that the temperature difference t _ie between the outlet and the inlet of the cooler for freezer is in the range of a ≦ t _ie <b. The flow rate of the refrigerant flowing through the room cooler is controlled.

The refrigerator-freezer according to the present invention is a refrigerator-freezer provided with a refrigerator for a refrigerator compartment and a refrigerator for a refrigerator compartment, and has one inlet channel and at least three outlet channels, and the at least three outlet channels are provided. The freezer compartment cooler and the refrigerating room cooler are connected to distribute the condensed refrigerant, and the freezer compartment cooler has two outlet channels whose opening degree can be controlled in a plurality of stages. A switching valve to be connected, where the temperature difference between the outlet and the inlet of the freezer cooler is _tie , the first predetermined value is a, and the second predetermined value is b (a <b). Since the flow rate of the refrigerant flowing through the freezer cooler is controlled so that the temperature difference t _ie between the outlet and the inlet of the cooler for the room falls within the range of a ≦ t _ie <b, the power consumption is low. Operation is possible, and the point where power consumption is smallest is shifted. It is possible to waste-free operation without a. Moreover, since the cooler inlet / outlet temperature difference can be kept within a certain range of values, a stable flow rate can be sent to the cooler, and the power consumption can be suppressed.

Further, the refrigerator-freezer according to the present invention is a refrigerator-freezer equipped with a refrigerator for a refrigerator compartment and a refrigerator for a refrigerator compartment, and is condensed with temperature detecting means for detecting temperatures at the outlet and inlet of the refrigerator for refrigerator compartment. The refrigerant is distributed to the freezer cooler and the refrigerator cooler, and has one inlet channel and at least three outlet channels, and two outlets of the at least three outlet channels A switching valve for connecting a flow path to the freezer cooler, and two outlet flow paths of the switching valve and the freezer cooler, and connected to the two outlet flow paths of the switching valve, respectively. A capillary having a different diameter and a capillary having different diameters, wherein the temperature difference between the outlet and the inlet of the cooler for freezer is _tie , the first predetermined value is a, and the second predetermined value is b (a <when set to b), the temperature difference t _i of the outlet and the inlet of the cooler for the freezing chamber Since There were so controlled by switching the outlet channel of the switching valve the flow rate of refrigerant flowing through the freezer compartment cooler as fall within the scope of a ≦ t _{ie <b,} with a small power-consuming state amount Operation is possible, and operation without waste is possible without deviating from the point where power consumption is minimized. Moreover, since the cooler inlet / outlet temperature difference can be kept within a certain range of values, a stable flow rate can be sent to the cooler, and the power consumption can be suppressed.

Further, refrigerator according to the present invention, includes a temperature detecting means for detecting the temperature of the outlet and the inlet of the freezing compartment cooler, the temperature difference between the outlet and the inlet of the cooler for the freezing chamber t _ie is t _ie <In the case of a, the opening degree of the outlet flow path which can be controlled in multiple stages of the switching valve is switched to a decrease in the opening degree, and in the case of b ≦ _tie , the opening degree of the switching valve is increased to the opening degree. Since the flow rate of the refrigerant flowing through the freezer cooler is controlled by switching, it is possible to operate without waste without deviating from the point where the power consumption is minimized.

Embodiment 1 FIG.
Hereinafter, a refrigerant circuit of a refrigeration cycle according to Embodiment 1 of the present invention will be described. 1 is a refrigerant circuit diagram of a refrigeration cycle according to Embodiment 1 of the present invention, FIG. 2 is a flow characteristic diagram of a three-way switching valve used in Embodiment 1, and FIG. 3 is three-way used in Embodiment 1. 4 is a longitudinal sectional view of the switching valve body, FIG. 4 is a plan view showing the valve seat of the three-way switching valve used in Embodiment 1, and FIG. 5 shows the relationship between the valve body and the surface in contact with the valve seat. Schematic shown. FIG. 6 is an enlarged cross-sectional view of a main part showing FIG. FIGS. 7A, 7B, 7C, and 7D are explanatory diagrams showing the contact position of the valve body corresponding to the operation step of the three-way switching valve, and FIG. 8 shows the opening for each operation step of the three-way switching valve. Degree table. FIG. 9 is a time chart for each operation step of the three-way switching valve. FIG. 10 is a flowchart showing control of the three-way switching valve according to Embodiment 1 of the present invention.

  In the figure, 1 is a compressor, 2 is a condenser, and 3 is a three-way switching valve whose opening degree can be controlled. The first outlet 3a whose outlet opening degree can be controlled is connected to the capillary 4a for the refrigerating room, and the other. The second outlet 3b is connected to the freezer capillary 4b. 5a is a refrigerator for a refrigerator compartment, 5b is a refrigerator for a freezer compartment, and 6 is a check valve.

  In the refrigerant circuit of the first embodiment, as indicated by an arrow, from the compressor 1 to the condenser 2, and through the three-way switching valve 3, one is from the first outlet 3a to the cold room capillary 4a, the cold room cooler. 5a and the other flows from the second outlet 3b to the compressor 1 through the freezer capillary 4b and the freezer cooler 5b.

  2 is a flow characteristic diagram of the three-way switching valve 3 used in Embodiment 1, wherein the vertical axis indicates a flow rate ratio when the fully opened flow rate is 100%, and the horizontal axis indicates the operation steps of the three-way switching valve 3. It is. As shown in FIG. 2A, the first outlet 3a of the three-way switching valve 3 has only two opening degrees of 0% or 100% depending on the number of pulses. Moreover, about the 2nd exit 3b of the three-way switching valve 3, the opening degree of the intermediate | middle is given in the range of a certain specific pulse number. The opening is determined according to the load, and is 70% in the first embodiment of the present invention. By using the three-way switching valve 3, the refrigerant flow rate flowing through the freezer compartment capillary 4b can be controlled in three ways: 100% flowing, 70% flowing, and 0% (not flowing).

  Further, the three-way switching valve 3 employs a method of rotating the valve body, and the flow rate can be controlled even when the refrigerant flow rate is relatively small such as a refrigerator.

  The details of the three-way switching valve will be described with reference to FIGS. In the figure, 3a is the first outlet of the three-way switching valve 3, 3b is the second outlet, and 3c is the inlet, both of which are provided in the valve seat 3d. 3e is an outlet side refrigerant pipe connected to the first outlet 3a and the second outlet 3b, 3f is an inlet side refrigerant pipe connected to the inlet 3c, 3g is a coil, and 3h is a resin rotor driven by this coil. The shaft 3i is fixed to the main body. 3j is a stopper rubber for restricting the rotation of the resin rotor 3i, 3k is a valve body, and a valve groove 3l is provided at a position on the circumference of the second outlet 3b provided in the valve seat 3d. As shown in FIGS. 5 and 6, the valve groove has a groove inlet width A reduced by a groove length L and a groove inlet depth B reduced by a groove length L along the circumferential direction of the groove. It is formed as follows.

  A valve groove 3l is located on the circumference of the second outlet 3b of the valve seat 3d by the valve body 3k configured in this way, and the valve groove 3l covers the second outlet 3b to block the flow path, It is possible to adjust the flow rate by controlling the opening.

  In FIG. 3, the opening degree of only one outlet can be controlled. However, the opening degree of both outlets can be controlled by stacking two valve bodies.

  The control signal is determined by various conditions such as the outside air temperature, each room thermistor, and the presence / absence of door opening / closing. For example, when the outside air temperature is high, when the load in the cabinet is large, or when the door is opened and closed frequently, the opening capacity of the three-way switching valve 3 is set to 100% to ensure the cooling capacity, and when the outside air temperature is low, When the internal load is small, the opening degree of the three-way switching valve 3 is set to 70% at the low load when the door is not opened and closed, thereby preventing overcooling and improving energy saving.

  The opening adjustment of the first outlet 3a and the second outlet 3b side of the three-way switching valve according to the first embodiment will be described with reference to FIGS. 7, 8, and 9. FIG. 7 (A), (B), (C), and (D) show a state in which the valve body 3k for each operation step is in contact with the valve seat 3d. As shown in FIGS. The number of pulses is (A), and in the valve open / close state, the first outlet 3a of the three-way switching valve is opened and the second outlet 3b is closed. In operation step b, the number of pulses is (B), and the valve open / close state is closed for both the first outlet 3a and the second outlet 3b of the three-way switching valve. In operation step c, the number of pulses is (C), and in the valve open / close state, the first outlet 3a of the three-way switching valve is closed and the second outlet 3b is 70% open. In operation step d, the number of pulses is (D), and in the valve open / close state, the first outlet 3a of the three-way switching valve is closed and the second outlet 3b is opened.

  Next, a control flowchart for adjusting the opening degree on the second outlet 3b side of the three-way switching valve shown in FIG. 10 will be described. Start and compressor operation in step S11? Judging. If the result is NO, the process proceeds to step S12. And defrosting in step S12? If YES, the process proceeds to step S13, and the opening degree of the first outlet 3a and the second outlet 3b of the three-way switching valve 3 is both fully opened. Also, defrosting in step S12? If the result of the determination is NO, the process proceeds to step S14, and both the opening degrees of the first outlet 3a and the second outlet 3b of the three-way switching valve 3 are fully closed by 0%.

  Also, is the compressor operating in step S11? If the result of the determination is YES, the process proceeds to step S15, and the outside air temperature Tout is measured by a thermistor attached outside the warehouse. Then, the result measured in step S16 is determined. If Tout ≦ 25 ° C., the process proceeds to step S17. If Tout ≦ 25 ° C., the process proceeds to step S18, and the second outlet 3b of the three-way switching valve 3 is opened. The degree is 100% fully open.

  In step S17, the number N of opening / closing of the freezer compartment door per fixed time τ1 is detected. Then, in step S19, 5 ≦ N is determined, and if NO, in step S20, the freezer temperature within a predetermined time τ2 is increased to Tfup. If the determination result is YES, in step S21, the opening degree of the second outlet 3b of the three-way switching valve 3 is set to 100% fully open.

  In step S20, the result of raising the freezer temperature within a predetermined time τ2 to Tfup is determined in step S22. If 2 ° C ≦ Tfup is not satisfied, the process proceeds to step S23, and the second outlet of the three-way switching valve 3 is determined. The opening degree of 3b is set to 70%. If the result of determination in step S22 is 2 ° C. ≦ Tfup, the routine proceeds to step S24, where the opening degree of the second outlet 3b of the three-way switching valve 3 is fully opened.

  Further, in the first embodiment, only 70% between 0% and 100% is provided, but a finer setting is possible. For example, as shown in FIG. It is also possible to set the opening or to have an opening that linearly changes from 0% to 100% in the same pulse range as shown in FIG. By doing in this way, the temperature control of the freezer compartment finer than before can be performed.

  Moreover, you may connect the 3b side of the three-way switching valve which can control an opening degree to the capillary 4a side for refrigerator compartments according to the form of a refrigerator. It is also possible to use a three-way switching valve that can control the opening degree on both sides.

  By installing such a three-way switching valve 3, it is possible to ensure the necessary cooling capacity without waste.

Embodiment 2. FIG.
FIG. 11 shows a refrigerant circuit diagram of the refrigerator-freezer according to the second embodiment. In FIG. 11, a four-way switching valve 19 (one inlet and three outlets) is provided after the condenser 2, the first outlet 19a is in the refrigerating room capillary 4a, and the second outlet 19b and the third outlet 19c are respectively The first freezer capillary 4b and the second freezer capillary 4c are connected. The other refrigerant circuit configuration is the same as that of the prior art.

  FIG. 12 is a flow characteristic diagram of the four-way switching valve 19 according to the second embodiment, and the four-way switching valve 19 provided in the refrigerant circuit has a function of only the flow path switching. The vertical axis is the flow rate ratio when the fully opened flow rate is 100%, and the horizontal axis is the operation step of the four-way switching valve 19.

  Moreover, the diameter of the capillary tube 4b for 1st freezer compartments and the capillary tube 4c for 2nd freezer compartments differ, for example, the diameter of the capillary tube 4b for 1st freezer compartments is more than the capillary tube 4c for 2nd freezer compartments. At this time, the flow rate of the refrigerant flowing through the freezer cooler 5b differs between the case where the refrigerant flows through the second freezer capillary 4b and the case where the refrigerant flows through the second freezer capillary 4c. The flow rate is greater than the flow rate in the second freezer capillary 4c. When the load is high, the refrigerant flows through the first freezer capillary 4b, and in conjunction with the internal fan and the compressor, sufficient cooling capacity is ensured. When the load is low, the refrigerant flows through the second freezer capillary 4c, The flow rate of the refrigerant flowing through the freezer cooler 5b can be reduced to reduce the input and improve energy saving.

  By configuring such a cycle, it is possible to control the flow rate to the freezer cooler in two stages for each load.

  Of course, similar to the three-way switching valve used in the first embodiment, the flow rate can be further controlled by providing each outlet with an opening in multiple stages or linearly with respect to the function and operation steps.

Embodiment 3 FIG.
In the third embodiment, the three-way switching valve 3 or the four-way switching valve 19 is controlled before and after defrosting. The configuration of the refrigeration cycle is the same as in the first and second embodiments.

  Usually, the defrosting control is such that the defroster thermistor attached to the freezer cooler 5b is heated by a defroster heater installed under the cooler 5b until a certain temperature is reached. Heating from outside. Here, it is possible to shorten the defrosting time by heating from the inside of the pipe. By opening the inlet / outlet of the three-way switching valve 3 or the four-way switching valve 19 in order to warm from the inside of the pipe, a relatively high temperature refrigerant flows from the compressor into the cooler 5, so that the three-way switching valve 3 or the four-way switching valve 19 The defrosting time is shorter than when the doorway is closed.

  If the defrosting time is shortened, the temperature change in the cabinet before and after the defrosting is reduced, the rise in the cabinet temperature during defrosting is suppressed, the impact on food in the cabinet is reduced, and the power consumption is also reduced. it can.

  In addition, after defrosting, each cooler immediately after defrosting is about + 15 ° C. due to heating by the heater, so in the control to alternately cool the refrigerator compartment or freezer compartment, the temperature of either room is It will go up to the next cooling timing.

In order to prevent this, the three-way switching valve 3 or the four-way switching valve 19 is controlled so that the refrigerant flows to both coolers for a certain period of time immediately after defrosting. In order to prevent overcooling, for example, it is possible to control the flow rate to the freezer compartment side cooler to some extent (about 70%) and to flow 100% to the refrigerator compartment side cooler.

  FIG. 13 shows time-series changes in the cooler temperature, the internal temperature (freezer compartment temperature), and the opening degree of the switching valve when the above control is performed. In the cooler temperature and freezer compartment temperature in the figure, the one-dot chain line indicates the case where the entrance / exit of the three-way switching valve 3 is closed, and the solid line indicates the case where the entrance / exit of the three-way switching valve 3 is open. Comparing the two lines, the solid line rises quickly at the start of defrosting, the defrosting completion time is shortened (A and B comparison), and the temperature rise C of the freezer compartment when defrosting is completed is also kept low. I understand that.

Embodiment 4 FIG.
FIG. 14 is a conceptual diagram illustrating the power consumption and the cooler inlet / outlet temperature difference with respect to the refrigerant flow rate flowing through the freezer cooler in the fourth embodiment. In the figure, the solid line indicates the power consumption, and the broken line indicates the cooler inlet / outlet temperature difference. From FIG. 14, it can be seen that there is a point at which the amount of power consumption is minimal for a certain refrigerant flow rate.

  In addition, since the temperature difference of the cooler inlet / outlet changes as shown in FIG. 14 with respect to the flow rate of refrigerant, the flow rate of refrigerant flowing to the cooler is adjusted by detecting this temperature difference and performing the three-way switching valve 3 control and the capillary switching. Therefore, it is possible to always operate with low power consumption.

  In the fourth embodiment, the temperature of a plurality of points in the refrigerant circuit is detected by a thermistor, and the opening degree of the three-way switching valve 3 or capillary switching is performed based on the temperature difference. The configuration of the refrigerant circuit is the same as that in the first and second embodiments.

  In the fourth embodiment, temperature detection thermistors are attached to the inlet and outlet of the cooler. The outlet can be replaced by a defrosting thermistor usually attached to the header.

FIG. 15 is a control flowchart according to the fourth embodiment. By performing this control, the temperature difference between the cooler inlet and outlet can be kept within a certain range, and a stable flow rate can be sent to the cooler, so that the power consumption can be suppressed.
In FIG. 15, after starting and determining whether or not the compressor is operating in step S21, the timer count is started in step S22. After starting the timer count, the process proceeds to step S23, where the timer is τ? Count until minute, and if YES, proceed to step S24 to detect the cooler inlet / outlet temperature difference t _ie , and if not a range other than a ≦ t _ie <b, if t _ie <a, step Proceeding to 25, control is performed by reducing the flow rate by switching the opening degree of the three-way switching valve 3 or switching to capillary. Further, in step S24, the cooler inlet / outlet temperature difference _tie is detected, and if b ≦ _tie , the process proceeds to step 26, and the control is performed by decreasing the flow rate by increasing the opening of the three-way switching valve 3 or switching to a thick capillary. .

Further, in step S24, the cooler inlet / outlet temperature difference t _ie is detected. If a ≦ t _ie <b, the counter is reset in step S27, the control is returned to the start, and this control is performed every τ minutes until the compressor stops. repeat. By performing such control, it is possible to operate without waste without deviating from the point where the power consumption is minimized.

A specific example of the time constant τ is preferably about 1 to 3 minutes, and the cooler inlet / outlet temperature difference _tie is preferably about a = 1 and b = 7.

Embodiment 5. FIG.
In the fifth embodiment, the outside air temperature, the inside temperature, and the cooler inlet / outlet temperature are detected by a thermistor, and the compressor rotation speed and the opening degree of the switching valve are controlled or the capillary is switched.

Although the control contents are the same as those of the fourth embodiment, the state of the cooler inlet / outlet temperature difference t _ie is more than a certain range (b ≦ t _ie ) continues at the time of start-up, high load, and after defrosting. There are cases. In such a case, the compressor rotational speed is changed (accelerated) from the outside air temperature and the inside temperature, and the opening degree of the switching valve is controlled or the capillary is switched.

  Conventionally, the cooling capacity is increased only by increasing the rotational speed of the compressor. However, according to the fifth embodiment, the opening degree of the switching valve 3 is controlled or increased before the rotational speed of the compressor is increased. Since the capillaries can be switched and the flow rate flowing through the cooler can be increased, the cooling capacity can be increased to some extent. This Embodiment 5 is smaller and more economical in terms of power consumption than in increasing the rotational speed of the compressor.

  Further, by further increasing the fan rotational speed, finer control is possible.

FIG. 16 is a time chart showing the time-series movement of each element of the fifth embodiment. In FIG. 16, for example, the rotation speed of the compressor is 3rd speed (50, 55, 60 rps), the opening degree of the switching valve is 3 stages (50, 75, 100%), and the rotation speed of the fan is 3rd speed (1200, 1250, 1300 rpm) is a time series change. By opening the switching valve opening before the compressor speed and fan speed increase, the flow rate of refrigerant flowing into the cooler can be controlled stepwise and more finely than before. Even at times, it does not give too much cooling capacity and realizes a lean operation.

It is a refrigerant circuit figure of the refrigerating cycle of the refrigerating refrigerator by Embodiment 1 of this invention. It is a flow characteristic figure of the three-way switching valve by Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the three-way switching valve main body by Embodiment 1 of this invention. It is a top view which shows the valve seat of the three-way switching valve by Embodiment 1 of this invention. It is the schematic which shows the relationship between the valve body by Embodiment 1 of this invention, and the surface which contacts a valve seat. It is a principal part expanded sectional view which shows FIG. 5 of this invention in a cross section. It is explanatory drawing which showed the contact surface position with the valve seat of the valve body corresponding to the operation | movement step of the three-way switching valve used in Embodiment 1 of this invention. It is a flowchart which shows control of the three-way switching valve by Embodiment 1 of this invention. It is an opening degree table | surface for every operation | movement step of the three-way switching valve by Embodiment 1 of this invention. It is a time chart for every operation | movement step of the three-way switching valve by Embodiment 1 of this invention. It is a refrigerant circuit figure of the refrigerating cycle of the freezer refrigerator by Embodiment 2 of this invention. It is the characteristic view which showed simply the flow characteristic of the change-over valve by Embodiment 2 of this invention. It is a time chart figure which shows the movement which shows the time-sequential change of the cooler temperature before and behind defrosting by this Embodiment 3, freezer compartment temperature, and the opening degree of a switching valve. It is a conceptual diagram showing the power consumption with respect to the refrigerant | coolant flow volume which flows into the cooler of this invention, and a cooler entrance / exit temperature difference. It is a flowchart which represents simply the control of Embodiment 4 of this invention. It is a time chart figure which shows the time-sequential movement of each element of Embodiment 5 of this invention. It is a schematic sectional drawing which shows the structure of the conventional refrigerator-freezer. It is a refrigerant circuit figure of the refrigerating cycle which connected the multiple cooler of the conventional freezer refrigerator in parallel. It is a refrigerant circuit figure of the refrigerating cycle which connected the multiple cooler of the conventional freezer refrigerator in series. It is a flowchart which shows control of the switching valve in the conventional refrigerator-freezer. It is a time chart figure which shows the time-sequential movement of each element of the conventional refrigerator. It is explanatory drawing which shows the starting rotation speed of each element of the conventional refrigerator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Condenser, 3 Three way switching valve, 3a 1st exit, 3b 2nd exit, 3c inlet, 3d valve seat, 3h resin rotor, 3j stopper rubber, 3k valve body, 3l valve groove, 3n valve body contact Surface, 4 capillaries, 5a refrigerator for refrigerator compartment, 5b cooler for refrigerator compartment, 6 check valve, 11 refrigerator compartment.

Claims (10)

In a refrigerator / freezer comprising a refrigerator for a refrigerator compartment and a refrigerator for a freezer compartment, the refrigerator has one inlet channel and at least three outlet channels, and the at least three outlet channels are connected to the refrigerator for freezer and the The refrigerant for condensing the condensed refrigerant connected to the refrigerator for the refrigerator compartment, comprising two switching passages for connecting the two outlet passages whose opening degree can be controlled in a plurality of stages to the refrigerator for the freezer compartment, When the temperature difference between the outlet and the inlet of the freezer cooler is _tie , the first predetermined value is a, and the second predetermined value is b (a <b), the outlet and the inlet of the freezer cooler The flow rate of the refrigerant flowing through the freezer compartment cooler is controlled so that the temperature difference t _ie falls within the range of a ≦ t _ie <b, which is a range that does not deviate from the point where the power consumption is reduced. A refrigerator-freezer. In a refrigerator / freezer comprising a refrigerator for a refrigerator and a refrigerator for a freezer compartment, temperature detecting means for detecting temperatures of an outlet and an inlet of the refrigerator for the freezer compartment, and a refrigerant for condensing the condensed refrigerant, Distributing to the refrigerator cooler and having one inlet channel and at least three outlet channels, and two outlet channels of the at least three outlet channels to the freezer cooler Connected between the switching valve to be connected, the two outlet flow paths of the switching valve and the freezer cooler, and the capillaries and capillaries having different diameters respectively connected to the two outlet flow paths of the switching valve The temperature difference between the outlet and the inlet of the cooler for freezer is t _ye , the first predetermined value is a, and the second predetermined value is b (a <b). point temperature difference t _ie outlet and inlet of the use cooler becomes smaller power consumption Characterized in that the flow rate of refrigerant flowing through the freezer compartment cooler as fall within the scope of a ≦ t _{ie <b} is Razure range not to be controlled by switching the outlet channel of the switching valve Freezer refrigerator. Comprising a temperature detecting means for detecting the temperature of the outlet and the inlet of the freezing compartment cooler, the temperature difference between the outlet and the inlet of the cooler for the freezing chamber t _ie of the switching valve in the case of t _{ie <a} The opening of the outlet channel that can be controlled in multiple stages is switched to a decrease in the opening, and when b ≦ _tie , the opening of the switching valve is switched to an increase in the opening so that the freezer cooler 2. The refrigerator-freezer according to claim 1, wherein a flow rate of the flowing refrigerant is controlled. Comprising a temperature detecting means for detecting the temperature of the outlet and the inlet of the freezing compartment cooler, the temperature difference between the outlet and the inlet of the cooler for the freezing chamber t _ie of the switching valve in the case of t _{ie <a} The flow rate of the refrigerant flowing through the freezer compartment cooler is controlled by switching the outlet flow channel to the capillary side and switching the outlet flow channel of the switching valve to the capillary side when b ≦ _tie. The refrigerator-freezer according to claim 2, wherein the refrigerator is a refrigerator. The refrigerator-freezer according to claim 1, wherein a = 1 and b = 7. In the case where a compressor capable of increasing the rotational speed is provided and b ≦ _tie continues, the opening degree of the switching valve is increased or switched before the rotational speed of the compressor is increased. 6. The refrigerator-freezer according to claim 1, wherein a valve is switched to a thick capillary side to increase a flow rate flowing through the cooler. Refrigerant flow rate flowing through the two coolers by adjusting a degree of opening of the changeover valve, comprising a switching valve for distributing and controlling the flow rate of refrigerant flowing through the freezer cooler and the refrigerator cooler in a plurality of stages. The refrigerator-freezer according to any one of claims 1 to 6, wherein the refrigerator is controlled. 8. The refrigerator-freezer according to claim 1, wherein an inlet passage and an outlet passage of the switching valve are opened when the freezer cooler is defrosted. 9. 9. The switching valve according to claim 1, wherein the switching valve is controlled so that a refrigerant flows through the two coolers simultaneously for a predetermined time after the defrosting of the freezer cooler. The refrigerator-freezer as described in. The compressor, the condenser, the switching valve, the refrigerator for the refrigerator compartment, and the refrigerator for the freezer compartment constitute a refrigerant circuit, and include a plurality of temperature detecting means for detecting temperatures at a plurality of points of the refrigerant circuit. The refrigerator-freezer according to any one of claims 1 to 9, wherein the opening degree of the switching valve is controlled or the outlet channel is switched based on a temperature difference of the temperature detecting means.

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