TWI377329B - - Google Patents

Description

1377329 IX. Description of the Invention [Technical Field of the Invention] The present invention relates to a cooling storage tank having a plurality of evaporators and supplying a refrigerant to the evaporators by a single compressor, and a method of operating the same. [Prior Art]

As such a cooling storage, there is a case where, for example, a freezer compartment and a refrigerating compartment are formed in a heat insulating partition body, and an evaporator is disposed in each chamber, and one evaporator is used. A cooling storage in which a refrigerant is alternately supplied to a refrigerant to generate a cooling effect is disclosed in Patent Document 1 below. The refrigerating cycle of the refrigerator is a refrigerant that is compressed by a compressor, and is liquefied by a condenser, and is alternately supplied to the freezer evaporator and the refrigerating chamber for evaporation at the outlet side of the three-way valve via a capillary tube. In the case where both the freezing compartment and the refrigerating compartment are cooled to the lower limit set temperature, the compressor operation is stopped. When either one exceeds the upper and lower set temperatures, the compressor is restarted to supply the refrigerant to the evaporator in the chamber. Patent Document 1: Japanese Laid-Open Patent Publication No. 2003-214748. However, since the set temperature of the refrigerator compartment is usually 5 °C and the set temperature of the freezer compartment is about -20 °C, the heat of the two chambers is observed by the refrigeration cycle. The load has a considerable difference, and the freezing room temperature rises earlier in a state where the cooling operation of the freezing compartment is stopped. In particular, in a commercial refrigerator, the user is allowed to open and close the door frequently or when the ambient temperature is high, the rise in the freezing room temperature becomes faster. However, in this refrigerator, after the compressor is stopped, -5 - 1377329 prohibits the compressor from starting again until the high and low pressure difference between the suction side and the discharge side of the compressor disappears (when the pressure difference is large again) When the compressor is started, there will be an excessive load applied to the compressor). Therefore, when the door of the freezer compartment is frequently opened and closed during the forced stop time of the compressor, the temperature of the cooling compartment rises, which adversely affects the food inside. The present invention has been made in order to solve the above-mentioned problems, and an object of the invention is to provide a cooling storage for selectively supplying a refrigerant to a plurality of evaporators provided in a plurality of storage chambers having different heat loads by one compressor. The library is a cooling storage tank capable of preventing an increase in the temperature of a storage chamber having a large heat load and a method of operating the same. SUMMARY OF THE INVENTION As a means for achieving the above object, an operation method of the present invention includes a compressor, a condenser, a valve device, first and second evaporators, and a throttling flow to the respective evaporators The refrigerant throttling device selectively supplies the refrigerant liquefied by the compressor and liquefied by the condenser to the first and second evaporators by the valve device, and the first and second evaporators (2) The evaporator alternately cools the cooling storages of the first and second storage compartments having different heat loads, and when the compressor is operated to alternately cool the first and second storage compartments, the compressor operation is stopped. After cooling the storage chamber having a large heat load, the compressor is stopped. The structure of the cooling storage of the present invention using this operation method is as follows. A refrigeration cycle having a structure of the following (A1) to (A6), a structure of a -6- 1377329; a storage body having a mutual heat load and being produced by the first and second evaporators described below The first and second storage compartments for cooling the air conditioner: the first and second storage compartment temperature sensors for detecting the temperatures of the respective storage compartments; and

The refrigeration cycle control circuit is configured such that when the temperature of any of the first and second storage compartments detected by the storage compartment temperature detector is higher than the set temperature of each of the storage compartments set in advance, The compressor is operated, and the valve device for supplying the refrigerant to the evaporator of the storage chamber is operated, and when the condition of (B1) or (B2) described below is satisfied, the operation of the compressor is stopped (A1) to compress the refrigerant. The compressor (A2) is connected to the condenser side by a condenser that is cooled by the refrigerant compressed by the compressor, and the inlet (A3) is connected to the condenser side, and the two outlets are connected to the first and second refrigerant supply paths. The valve device (A4) that selectively communicates with the flow path switching operation of any one of the first and second refrigerant supply paths is provided in the first and second refrigerant supply paths, respectively. And a second evaporator, (A5) a throttling device for throttling the refrigerant flowing into the evaporators, and (A6) connecting the refrigerant outlet sides of the first and second evaporators in common, and connecting to the compression Cooling side of the refrigerant The refrigerant circulation path, 1377329 (B1), for the storage chamber having a small heat load in the first and second storage compartments, by first causing the storage compartment temperature to be lower than the set temperature of the storage compartment, and then performing the above-described valve The flow switching operation of the device continues the cooling operation of the other storage compartment, the storage compartment temperature is lower than the set temperature of the storage compartment, and (B2) the thermal load in the first and second storage compartments is large. In the storage compartment, by first causing the storage compartment temperature to be lower than the set temperature of the storage compartment, the flow switching operation of the valve device is performed, and the cooling operation of the other storage compartment is continued to make the storage compartment temperature low. At the set temperature of the storage chamber, the flow switching operation of the valve device is performed again, and the storage chamber having a large heat load is again cooled, and the storage chamber temperature is lower than the set temperature of the storage chamber. According to the present invention, when any of the first and second storage compartments stores the room temperature exceeding the set temperature, the compressor operates to supply the refrigerant to the evaporator of the storage compartment. The condition for stopping the operation of the compressor is as described above. In any state, the storage chamber having a large heat load must be finally cooled, and the storage temperature is cooled to the set temperature. Therefore, it is possible to prevent in advance: the compressor is stopped later. During this period, the storage temperature rises to an inappropriate area. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to Figs. 1 to 6 . In this embodiment, a case of a horizontal (table type) cooling storage suitable for business use is taken as an example. First, the overall structure will be described based on Fig. 1 . Reference numeral 10 denotes a storage body which is constituted by a horizontally long heat insulating box which is open at the front, and is supported by a four-legged foot 11 provided on the bottom surface by -8- 1377329. The inside of the storage unit body 10 is partitioned into left and right by the heat insulating partition wall 12 to be attached later, and the relatively narrow side on the left side is the freezer compartment 13F corresponding to the first storage compartment, and the wide side on the right side is equivalent to the second. The refrigerator compartment 13R of the storage compartment. Further, in the opening of the front side of the freezing compartment 13F and the refrigerating compartment 13R, an openable and slidable hot spot (not shown) is mounted.

A mechanical chamber 14 is provided on the left side portion of the storage container body 10 when viewed from the front. On the deep side of the upper portion of the machine room 14, an evaporator chamber 15 for the heat insulating freezing chamber 13F communicating with the freezing chamber 13F is formed, and a duct 15A and an evaporator fan 15B are provided, and a compressor is provided below it. The unit 16 can be placed in and out of the unit. Further, on the surface of the partition wall 12 on the side of the storage compartment 13R, the evaporator chamber 18 for the refrigerator compartment 13R is formed by the extension duct 17, and the evaporator fan 18A is provided here. The compressor unit 16 is provided with a compressor 20 that is driven by a motor (not shown) to compress the refrigerant, and a condenser 2 that is connected to the refrigerant discharge side of the compressor 20, and is available from the machine room 1. 4 is taken out and placed in the machine room 14, and a condenser fan 22 for air-cooling the condenser 21 is also mounted (only shown in Fig. 2). As shown in Fig. 2, the outlet side of the condenser 21 is connected to the inlet 24A of the three-way valve 24 as a valve device through a dryer. The three-way valve 24 has one inlet 24A and two outlets 24B and 24C, and the outlets 24B and 24C are connected to the first and second refrigerant supply paths 25F and 25R. The three-way valve 24 can be configured to select the inlet 24A. The flow path switching operation of one of the first and second refrigerant supply paths 25F and 25R is communicated with the common communication operation of the first and second refrigerant supply paths 25F and 25R in common with the 1377329 inlet 24A. The first refrigerant supply path 25F is provided with a capillary 26F corresponding to the freezer side of the throttle device, and an evaporator for the freezer compartment (the i-th evaporator) housed in the evaporator chamber 15 on the freezer compartment 3F side. ) 27F. Further, in the second refrigerant supply path 2 5R, a refrigerating chamber side capillary 26R as a throttle device and an evaporator for a refrigerating compartment (second evaporator) housed in the evaporator chamber 18 on the refrigerating chamber 13R side are provided. The 27R»two evaporators 27F, 27R are connected to the compressor 20 by the liquid separator 28F, the check valve 29, and the liquid separator 28R being sequentially overlapped and connected in common, and provided with the downstream side of the check valve 29 being branched. The refrigerant ring flow path 31 on the suction side. The circulation path of the refrigerant returning to the suction side from the discharge side of the compressor 20 is configured, and the conventional refrigeration cycle 40 for supplying the refrigerant to the two evaporators 27F and 27R by one compressor 20 can be borrowed. The supply of the liquid refrigerant to the other party is changed by the three-way valve 24. The compressor 20 and the three-way valve 24 are subjected to a refrigeration cycle control circuit 50 in which a CPU is incorporated. In the refrigeration cycle control circuit 50, the F sensor 5 1 F corresponding to the first storage compartment temperature sensor and the temperature of the air in the refrigerating compartment 13 3 R are supplied from the temperature of the air in the detection freezing compartment 13F. Corresponding to the signal of the R sensor 5 1 R of the second storage compartment temperature sensor, the detection temperature of the F sensor 5 1 F is higher than the upper limit measurement temperature (TF(ON)) of the freezer compartment 1 3 F, When the detected temperature of the R sensor 51R is higher than the upper limit set temperature (TR(ON)) of the refrigerating chamber 13R, the compressor 20 is started, the cooling operation is started, and the three-way-10-1377329 valve after the start of the cooling operation is started. The switching operation of 24 and the stopping operation of the compressor 20 are as follows. (Cooling start - FR interactive cooling)

When the compressor 20 is started by pressing the power source of the cooling storage, the three-way valve 24 performs a flow switching operation every predetermined period of time, and is alternately switched so that the inlet 24A communicates only with the state of the first refrigerant supply path 25F side ( Hereinafter, the state is "F side open state"), and the state in which the inlet 24A communicates with the second refrigerant supply path 25R side (hereinafter referred to as "R side open state") (step S1), and the refrigerating compartment is created. 1 3 R Freezer compartment 1 3 F Interactively cooled state (R chamber F room interactive cooling). Next, proceeding to step S2, comparing the temperature of the refrigerating compartment 13R with the preset refrigerating compartment lower limit temperature TR (OFF) based on the signal from the R sensor 51R, and further, in step S3, according to the F sensor 51F The signal compares the temperature of the freezer compartment 13F with the previously determined freezer compartment lower limit temperature TF (OFF). Since the temperature in the interior of each chamber has not reached the respective lower limit temperatures since the start of the cooling operation, the process returns to step S1' in step S1 to repeat: the three-way valve 24 alternately switches "F-side open state" at regular intervals. The FR is cooled and operated in parallel with the "R side open state". (F cooling only) When the cooling continues, when the internal temperature of the refrigerating chamber 13R is lower than the lower limit temperature TR (OFF) of the refrigerating compartment set in advance, the flow proceeds from step S2 to step S4, and the three-way valve 24 is switched to the r ρ side opening. State", only the freezer compartment - 11377329 13F is cooled. Then, the process proceeds to step S5' to judge whether or not the predetermined set temperature TR (ON) has not been reached based on the signal from 51R. Generally, after the FR cross-cooling is completed, the cold recording is sufficiently cooled, so the process proceeds to the next step S 6 'the detector of the root detector 51F, and the lower limit temperature of the freezer compartment set in the library in the freezer compartment 13F is determined. TF (OFF), the step lowering temperature TF (OFF) is repeated until the stepping result is repeated, and only the freezing compartment 13F is concentratedly cooled. In the middle of the cooling operation, if the cooling degree is increased, the process returns to step S1 in step S5, and the cooling of the refrigerating compartment Π R is again started again, and the temperature rise of the refrigerating compartment 1 3 R is suppressed. . By this "F cooling only", the freezer compartment 13F is brought to the freezer compartment lower limit temperature TF (OFF S6 moves to step S7, the compressor 20 is stopped, and the compressor 20 is prohibited from being stopped until the stop time T elapses. Starting (steps between the forced stop time T, the liquid refrigerant supplied to the device 2 7F evaporates, as shown in Fig. 4, the high and low pressure difference of the disappearance. (Restart of the compressor) When in step S 10, The compressor forcibly stops the time T to step S13, and according to the F sensor from the F sensor 51F, the R sensor refrigerating chamber upper limit chamber 13R will be received! From the F sense temperature is reached at the arrival of the freezing! S 4 ~S 6. The temperature t of the carrier chamber 1 3R starts to perform the FR line, so that it can be quickly and sufficiently cooled. When the compressor is forced to stop by the step S8), when the freezer chamber evaporates and the compressor 20 passes, then The movement number is relatively cold -12-1377329 The temperature of the freezing chamber 13F and the preset freezing chamber upper limit setting temperature TF (ON), and further, in step S14, the refrigerator compartment 13R is compared based on the signal from the R sensor 51R. Temperature and pre-set refrigerator compartment upper limit setting Temperature TF (ON). When the temperature of the freezing compartment 13F or the refrigerating compartment 13R becomes higher than each of the upper and lower set temperatures in any of the steps, the compressor 20 is started (steps S11, 12), and the process proceeds to step S4 or step S13, and the freezing compartment 13F or the refrigerating compartment is started again. 13R cooling.

As described above, in the present embodiment, the compressor 20 is started on the condition that the temperature exceeds the upper limit set temperature in either of the freezing compartment 13F or the refrigerating compartment 13R. After proceeding to step S13, after the cooling of the refrigerating compartment 13R is started again, when the temperature of the freezing compartment 13F rises, the flow returns to the FR cross-cooling (steps S14 to S1), and the cooling of the freezing compartment 13F is started again. When the FR is alternately cooled, when the refrigerating compartment 13R (the storage compartment having a small heat φ load) first reaches the refrigerating compartment lower limit set temperature TR (OFF) (step S2), the three-way valve 24 is switched to the "F-side open state". In the flow switching operation, "F cooling only" (step S4 • ) is executed, whereby when the temperature of the freezing compartment 13F is cooled to the freezer compartment lower limit setting • temperature TF (OFF), the compressor 20 is stopped (step S7). The above cooling operation is as shown in Fig. 5. Here, at time t1, the refrigerating compartment 13R reaches the lower limit set temperature TR (OFF) before the freezing compartment 13F. Conversely, in the case of FR interactive cooling, the freezer compartment 13F (the storage compartment with a large heat load) first reaches the lower limit set temperature of the freezer compartment TF ( -13- I377329)

In the case of OFF (step S3), the process proceeds to step S13, and the three-way valve 24 switches to the flow switching operation of the "R side open state j", thereby switching to the cooling of the refrigerating compartment 13R ("R chamber cooling"). As a result, when the temperature of the refrigerator compartment 13R is cooled to the refrigerator compartment lower limit set temperature TR (OFF) (step S15), it has been conventionally determined that the FR two chambers are cooled to stop the compressor 20, but in the present embodiment, the shift is performed again. When the "F room cooling" is performed (step S4), the temperature of the freezing compartment 13F is cooled to the freezing compartment lower limit setting temperature TF (OFF), and the compressor 20 is stopped (step S7). The cooling operation in this case is as shown in Fig. 6. Here, at time t2, the freezing compartment 13F reaches the lower limit set temperature TF (OFF) before the refrigerating compartment 13R. That is, in the present embodiment, the conditions for stopping the compressor 20 in the case of performing FR cross-cooling are as follows (b1) and (b2).

(bl) When the refrigerating compartment 13R is lower than the lower limit set temperature first, the flow switching operation of the three-way valve 24 is performed, and the cooling operation of the freezing compartment 13F is continued to be performed so that the temperature is lower than the freezing compartment lower limit set temperature TF (OFF) ) (Refer to Figure 5). (b2) When the temperature of the freezing compartment 13F is lower than the freezing compartment lower limit setting temperature TR (OFF), the flow switching operation of the three-way valve 24 is performed, and the temperature of the refrigerating compartment 13R is lower than the refrigerating compartment lower limit setting temperature TR At (OFF), the flow switching operation of the three-way valve 24 is performed again, and the cooling is returned to the freezing chamber 13F, and the temperature of the freezing chamber 13F is lower than the freezing chamber lower limit setting temperature TF (OFF) (see Fig. 6). Therefore, even if any one of the freezing compartment 13F and the refrigerating compartment 13R first reaches the lower limit set temperature, the freezing compartment 13F (the storage compartment 14-1377329 having a large heat load) must be finally cooled, and the temperature thereof is cooled to the lower limit set temperature. Therefore, it is possible to prevent in advance that the temperature of the freezing compartment 13F rises to an inappropriate area during the subsequent stop of the compressor 20 . Further, the present invention is not limited to the above description and the embodiments described with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the cooling storage compartment including the freezing compartment and the refrigerating compartment has been described as an example. However, the present invention is not limited thereto, and is also applicable to a refrigerating double compartment or a freezing compartment having a refrigerating compartment and a defrosting compartment, and having different storage temperatures. A two-chamber cooling storage, that is, a cooling storage having storage compartments having different heat loads, can be widely applied to a refrigerant supplied to an evaporator provided in each storage compartment by a common compressor. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an embodiment of the present invention. Fig. 2 is a configuration diagram of a refrigeration cycle. Figure 3 is a flow chart showing the cooling action. Fig. 4 is a graph showing the pressure equalization state after the compressor is stopped. Fig. 5 is a timing chart showing changes in temperature when the refrigerator compartment first reaches the lower limit set temperature. Fig. 6 is a timing chart showing changes in temperature when the freezing compartment first reaches the lower limit set temperature. [Description of main component symbols] -15- 1377329 1 〇: Storage unit body 20: Compressor 21: Condenser 24: Three-way valve (valve device) 25F, 25R: First and second refrigerant supply paths 26F, 26R: Capillary ( Throttle device 27F: evaporator for freezer (first evaporator)

2 7R: evaporator for refrigerator compartment (2nd evaporator) 3 1 : refrigerant circulation path 40 : refrigeration cycle 5 0 : refrigeration cycle control circuit 5 1 F : F sensor (1st storage compartment temperature sensor) 5 1 R : R sensor (2nd storage room temperature sensor)

-16-

Claims (1)

1377329 X. Patent Application No. 1. A method for operating a cooling storage tank, characterized by: a section comprising a compressor, a condenser, a valve device, a first device, and a refrigerant for throttling into each of the aforementioned evaporators The refrigerant that is compressed by the compressor and liquefied by the compressor is selectively supplied to the first heater by the valve device, and the first and second evaporators alternately cool the heat load 1 and the second In the cooling storage of each storage compartment, after the compressor is operated and the first storage compartment is alternately cooled, when the compressor operation is stopped, the heat load is largely cooled, and then the compressor is stopped until a predetermined time is passed. It is forbidden to restart the compressor until the stop time. 2. A cooling storage tank comprising: a refrigeration cycle having a junction storage body of A 1 to A6 having a heat load different from each other and generated by the first and second evaporators a first storage compartment cooled by cold air; first and second storage compartment temperature sensors, wherein the sensing detects temperatures of the respective storage compartments; and a refrigeration cycle control circuit by which the storage compartments are When the detected temperature of any of the first and second storage compartments is higher than the set temperature of each of the storage compartments, the pre-operation is performed, and the refrigerant supply to the evaporator of the storage compartment is used to operate, and when The second evaporation flow device conforming to the following (B1) or (B2), the second and second storage chamber compressors of the condensation second evaporation are strong for the temperature detection by the following and the second When the valve member of the compressor is set in advance, the operation of the compressor of the first -17-1377329 is stopped, and the compressor is restarted (A1) to compress the refrigerant until the predetermined compressor forcible stop time elapses. A2) by The condenser (A3) inlet to which the refrigerant compressed by the compressor is cooled is connected to the condenser side, and the two outlets are connected to the first and second refrigerant supply paths, so that the inlet side can be selectively communicated with The valve device (A4) of the flow path switching operation of any one of the first and second refrigerant supply paths is provided in the first and second evaporators of the first and second refrigerant supply paths, respectively (A5) a throttling device for restricting the flow of the refrigerant to the respective evaporators, and (A6) connecting the refrigerant outlet sides of the first and second evaporators in common, and connecting the refrigerant circulation path of the refrigerant suction side of the compressor (B1) In the storage compartment having a small heat load in the first and second storage compartments, the flow rate of the valve device is switched by first causing the storage compartment temperature to be lower than the set temperature of the storage compartment. The operation continues the cooling operation of the other storage compartment, the condition that the storage compartment temperature is lower than the set temperature of the storage compartment, and (B2) the storage compartment having a large thermal load in the first and second storage compartments. First make the storage room temperature low In the case of the set temperature of the storage chamber, the valve is again operated by performing the flow switching operation of the valve device and continuing the cooling operation of the other storage chamber to make the storage chamber temperature lower than the set temperature of the storage chamber. The flow switching operation of the device re-cools the storage chamber of -18-1377329 with a large heat load, so that the temperature of the storage chamber is lower than the set temperature of the storage chamber. 3. The cooling storage of claim 2, wherein the first and second storage compartments are a refrigerating compartment and a freezing compartment. 4. The cooling storage of claim 2, wherein the valve device is a three-way valve having one inlet and two outlets. 5. The cooling storage of claim 3, wherein the valve device is a three-way valve having one inlet and two outlets. 6. The cooling storage of claim 2, wherein the refrigeration cycle control circuit is any one of a first and a second storage compartment detected by the storage compartment temperature sensor When the storage compartment temperature is higher than a predetermined temperature of each of the storage compartments set in advance, the compressor is operated to operate the valve device for supplying the refrigerant to the evaporator of the storage compartment, and the storage compartment temperature is When the other storage chamber temperature detected by the sensor is higher than the set temperature of the storage chamber, the valve device is actuated to supply the refrigerant to the first and second evaporators alternately. -19- 1377329 VII. Designated representative map: (1) The designated representative figure in this case is the picture (2). (2) The symbol of the representative figure of this representative figure is a brief description: 20: Compressor 21: Condenser 22: Condenser fan 23: Mounting part 24: Three-way valve 24A: Inlet 24B, 24C: Outlet 3 1: Refrigerant ring flow path 25F ' 25R : First and second refrigerant supply paths 26F and 26R : Capillaries 27F and 27R : First and second evaporators 28F and 28R : Accumulator 29 : Stop valve 40 : Refrigeration cycle 50 : Refrigeration cycle control circuit (device 5 1 F : F sensor 5 1 R : R sensor 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: none