JPS61256166A - Controller for operation of refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an operation control device for a refrigeration system, and more particularly, it is non-freezing resistant and requires storage at the lowest possible temperature. The present invention also relates to a device that can appropriately cool and preserve so-called partially frozen stored items.

(Prior Art) In general, stored materials that are to be cooled in marine container refrigeration equipment, etc. are roughly divided into frozen stored materials and refrigerated stored materials. On the other hand, the latter type of refrigerated products must be avoided from freezing cold air because freezing can cause protein deterioration or so-called surface chilblain development.

Therefore, conventionally, as an operation control device for a refrigeration equipment, as disclosed in Japanese Patent Publication No. 52-40063, for example,
There are two types of operation modes, one of which is to set the pressure *a to 0N-O so that the evaporator intake air temperature converges to the desired set internal temperature.
The refrigeration operation mode is set to FF control, and the other is set to the refrigeration operation mode where the capacity of the refrigeration system is controlled so that the temperature of the air blown from the evaporator converges to the set internal temperature, and the set internal temperature reaches a predetermined refrigeration-freezing operation switching temperature. There is a known system in which refrigeration operation is selected when the temperature exceeds the temperature, while freezing operation is selected when the temperature is below the refrigeration-freezing operation switching temperature.

(Problems to be Solved by the Invention) In addition to the above-mentioned frozen and refrigerated products, there are
In between these are stored items that need to be frozen, but should not be stored at too low of a temperature. In other words, while refrigerated storage results in a loss of freshness or spoilage, proteins tend to denature when frozen at relatively low temperatures, so so-called partial freezing requires freezing at relatively high temperatures. It is a stored item.

However, in the above-mentioned conventional system, the operation modes are limited to two types: freezing operation and refrigerating operation, so although frozen and refrigerated items can be cooled and preserved well, partially frozen items cannot be stored properly. However, there is a problem that it cannot be stored properly under cooling. In other words, when partially frozen stored items are cooled and stored in the refrigerated operation mode, the intake air temperature, that is, the temperature of the stored items (item temperature), is equal to the set internal temperature in order to converge the outlet air temperature to the set internal temperature. This will lead to a decrease in freshness and spoilage of stored items.

On the other hand, when stored in a refrigerator mode,
Suction air fArIK while controlling the compressor 0N-OFF
In order to converge to the set internal temperature, the compressor is turned on.
At ll m, the refrigerating capacity increases relative to the load, and the temperature of the blown air drops significantly below the set temperature inside the refrigerator.This blown cold air causes protein deterioration, and the operating time of the compressor is shortened. , the frequency of starting and stopping increases.

Therefore, the present applicant first applied for patent application No. 58-228992.
In this issue, in addition to the above-mentioned refrigeration and freezing operation modes, a separate partial freezing operation mode is provided in which partially frozen stored items can be cooled and preserved for a long period of time, thereby improving the storage performance for partially frozen stored items. At the same time, they are proposing a system that reduces the number of times the compressor starts and stops, thereby improving its reliability.

In other words, the configuration of the above proposal is such that the evaporator blows air a! a blowout air temperature detection means for detecting the air temperature, a suction air temperature detection means for detecting the suction air temperature of the evaporator, a chamber temperature setting means for setting a desired chamber temperature, and a signal from the discharge air temperature detection means. Based on the setting of 1 degree of blowing air inside the warehouse 11
refrigeration operation control means for controlling the capacity of the cold 21 II device so that it converges to m, and partial refrigeration operation control for controlling the capacity of the refrigeration device so that the suction air temperature converges to the set internal temperature based on the signal from the suction air temperature detection means. means, refrigeration operation control means for controlling the compressor ON-OFF so that the intake air temperature converges to the set internal temperature based on the signal of the suction air 1m detection means, and a set internal humidity by the internal temperature setting means. Switch the specified refrigeration/partial freezing operation! ff1a and the predetermined partial freezing-freezing operation switching temperature, and if the set internal temperature exceeds the predetermined refrigerating/partial freezing operation switching temperature, the refrigeration operation control means is set to predetermined partial freezing at a temperature below the predetermined refrigeration/partial freezing operation switching temperature. - an operation mode switching means that operates a partial freezing operation &1J1 means when the temperature is above the freezing operation switching temperature, and an operation mode switching means that operates the freezing operation control means when the temperature is below the predetermined partial freezing and freezing operation switching temperature; The storage is carried out in a partial freezing operation mode that controls the capacity of the cooling device based on the suction air temperature, and when partially frozen stored items are stored under cooling, the temperature of the product is kept at approximately the same temperature inside the warehouse by cooling storage based on the suction air temperature. In addition to convergently controlling the temperature to maintain its freshness,
By controlling the capacity of the refrigeration equipment and adjusting the refrigeration capacity to the load, we can reduce the drop in the temperature of the blown air and prevent protein deterioration due to the cold blown air, while at the same time reducing the tendency of the compressor to start and stop. This is what I did.

By the way, when the operation mode is set to 3 seconds of freezing, partial freezing, and refrigeration as suggested above, if the stored items are cooled to around the setting 1 interior temperature in the freezing operation mode, the temperature distribution inside the refrigerator will be less uniform. In situations where there is no strict requirement for cooling, it is desirable to always drive the evaporator fan at a low rotation speed to reduce the amount of cold air circulated, thereby saving energy accordingly. On the other hand, during the partial freezing and refrigeration operation modes, the cold air circulation is different during pulldown (at the start of operation) and when the temperature inside the refrigerator is stable. In a situation where there is no point in trying to make the distribution even, we can reduce the amount of cold air circulated, thereby saving energy and increasing the actual cooling capacity of the refrigeration system to quickly lower the temperature inside the refrigerator. Furthermore, when the temperature inside the refrigerator is stable, it is strictly required to warm the stored material through the blow pipe, so it is desirable to increase the amount of cold air circulation to make the temperature distribution inside the refrigerator more uniform. For this reason, it is possible to increase or decrease the rotation speed of the evaporator fan, and to increase or decrease the rotation speed, for example, when the temperature inside the refrigerator falls to a predetermined value near the target temperature due to pull-down operation. Conceivable.

However, as mentioned above, Fan I! [When switching to increase or decrease 1, immediately after switching to the side where the air volume increases, the input to the drive motor of the evaporator fan increases, and the wall air speed into the refrigerator increases. The cooling load suddenly increases due to an increase in the amount of heat entering the system. Therefore, in the above idea, J! When lfl is increased, the cooling capacity of the refrigeration system increases slightly, but the suction air temperature suddenly rises due to the increase in the cooling load, so the suction air temperature is not centered around the set internal temperature. As a result, the rotation speed of the evaporator fan frequently increases or decreases, which adversely affects electrical components such as motors and relays, and it takes time for the internal temperature to converge to the set temperature, causing Good cold storage properties for partially frozen stored products will be impaired.

The present invention has been made in view of the above, and its purpose is to additionally set a partial freezing operation mode in addition to the refrigerating operation and freezing operation, and to set a partial freezing operation mode in addition to the refrigerating operation and freezing operation mode, as proposed above. By making it possible to increase or decrease the fan RMM, and by setting the air volume increase/decrease at a predetermined temperature higher than the upper limit of the internal temperature setting range, partially frozen stored items can be cooled well in the partially frozen operation mode. In addition, during refrigeration and partial freezing operation modes, the evaporator fan rotates at low speed during pull-down to save energy, and when the temperature inside the refrigerator is stable, the effect of increased cooling load due to switching to the increasing side of fan I@lit is reduced. The purpose of the present invention is to further improve cooling storage performance for refrigerated and partially frozen stored items by converging the suction air temperature to a target value in a shorter time while reducing the temperature.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention, as shown in FIG. s) and an evaporator fan (5) of the evaporator (5).
a), a suction air temperature detection means (11) for detecting the suction air temperature (tR), an internal temperature setting means (15) for setting the internal temperature m degree, and the above-mentioned outlet air temperature detection means (10).
refrigeration operation control means (27) that controls the capacity of the refrigeration system (A) so that the outlet air temperature rtl (ts) converges to the set internal temperature (tSp) based on the signal; and the suction air temperature detection means (11). ) Based on the signal of the suction air temperature (t
A partial refrigeration operation control means (28) that controls the capacity of the refrigeration system (A) so that R) converges to the set internal temperature (tSp), and a suction air temperature * based on the signal from the suction air temperature detection means (11). (tR) is set in the warehouse 2! ! r! 1(t s
The compressor (1) is turned on so that it converges to
III control t6 refrigeration operation control means (29),! :, Set internal temperature (tSp) by the internal temperature setting means (15)
) is compared with the predetermined refrigeration/partial freezing operation switching temperature (tcρ) and the predetermined partial freezing/freezing operation switching temperature (t P F ), and the set refrigerator temperature (tSp) is determined to be the predetermined refrigeration/partial freezing operation switching temperature (t (p) When the temperature is higher than the predetermined refrigerating/partial freezing operation switching temperature (t c p ) and above the predetermined partial freezing/freezing operation switching temperature (tPF), the partial freezing operation control means (28) is activated. ), the predetermined partial freezing-refrigeration operation switching temperature (tP
An operation mode switching means (30) is provided which operates the refrigeration operation control means (29) when the temperature is less than F).

Furthermore, in response to the output of the operation mode switching means (30), the evaporator fan (5a) is rotated at a low speed in the freezing operation mode, while the intake air temperature (t R) is changed in the refrigeration operation mode and the partial freezing operation mode. When the tilt switching temperature (ti), which is higher than the upper limit of the internal temperature setting range, is exceeded, the evaporator fan (5a) is rotated at low speed, and the suction air temperature (tR) is lowered to below the air volume switching temperature (tiL). An air volume control means (31) for rotating the evaporator fan (5a) at high speed is provided.

(Function) As described above, in the present invention, the operation mode switching means (30)
When the partial refrigeration operation control means (28) is activated by selection of
Since the intake air temperature, that is, the product temperature, converges to the set internal temperature, the freshness of partially frozen stored items is well maintained, and
By controlling the capacity of the refrigeration system I (A), the cooling capacity corresponds to the load, so the drop in the temperature of the blown air is reduced, preventing protein deterioration due to the blown cold air, and at the same time reducing the frequency of the compressor starting and stopping. Maro is reduced.

In addition, in the refrigeration mode in which uniformity of temperature distribution in the refrigerator is not so strictly required, the evaporator fan (5a) is driven at low rotation speed by the air volume control means (31), so that the stored items are kept at almost the set temperature in the refrigerator. Energy savings can be achieved while cooling.

In addition, during refrigeration and partial freezing operation modes that strictly require uniform temperature distribution inside the refrigerator, the evaporator fan (
The rotational speed of 5a) is switched from high to low by the air volume control means (31) at the Ji amount switching temperature (to), and the intake air temperature becomes J
When the iL volume switching temperature (tiL) is exceeded, the engine is driven at a low rotation speed, which saves energy, and when the intake air temperature (tR) is below the air volume switching temperature (tiL), the refrigerator is driven at a high rotation speed. A uniform internal temperature distribution is ensured.Here, when the evaporator fan (5a) is switched from low rotation to high rotation, that is, at the ff1ffl switching temperature (switching port), the intake air temperature (t R) is Since the high temperature value exceeds the upper limit of the internal temperature setting range, I!
The increase in incoming heat due to the increase in lff1 is suppressed to a small level, and the cooling capacity of the refrigeration system (A) is sufficient, so that the temperature inside the refrigerator does not increase.

As a result, the suction air m degrees smoothly reaches the set internal temperature (tSp) without causing hunting when changing the rotation speed of the evaporator fan (5a) and without adversely affecting the durability of electrical components. Good convergence will be achieved in a short period of time. Moreover, since the air volume switching unit 1!11: (tl-IL) is higher than the upper limit of the internal temperature setting range, all refrigerated items, including refrigerated items at low storage temperatures, and partially frozen storage The rotational speed of the evaporator fan (5a) is switched between low and high speeds to ensure uniform temperature distribution within the refrigerator.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings from FIG. 2 onwards.

FIG. 2 shows an embodiment in which the present invention is applied to a marine container refrigeration system (A). In the figure, (1) is a compressor, (2
) is a water-cooled condenser, (3) is operated when cooling water is not circulating in the water-cooled condenser (2), and three blower fans (3a)...
・An air-cooled condenser having a Refrigerant piping (6)
... are connected to allow refrigerant circulation to form a closed circuit (7), and two evaporator fans (5a).

While rotating (5a), the refrigerant is sequentially transferred to the air-cooled condenser (3), water-cooled condenser (2), and expansion valve (4) by the compressor (1).
By circulating the gas refrigerant through the evaporator (5) and the compressor (1), the heat amount of the gas refrigerant is released outside the refrigerator in the water-cooled or air-cooled condenser (2>, (3)).
In the evaporator (5), the liquid refrigerant absorbs the amount of heat inside the refrigerator to cool the inside of the refrigerator.

(8) also transfers the hot gas refrigerant from the compressor (1) to the water-cooled and air-cooled condensers (2), (3) and the expansion valve (4).
a proportional control valve that bypasses and supplies the evaporator (5), (
9) is an external pressure equalizing pipe of the expansion valve (4), which is connected to the switching solenoid valve (
2082), and when operating the refrigeration VT unit (A) at full capacity, the switching solenoid valve (2082) is turned OFF and the first
While guiding the refrigerant pressure at the outlet of the evaporator (5) to the expansion valve (4) via the pressure equalization pipe (91), when operating the refrigeration system (A) under capacity control, the switching solenoid valve <2082> is turned ON. 2 Hot gas bypass pipe (
81) to the expansion valve (4).
I'm trying to narrow down the opening.

Furthermore, (10) is the temperature of the air blown from the evaporator (5) ((S
), the outlet air temperature sensor as a means for detecting the temperature (11) of the intake air of the evaporator (5) (
A suction air temperature sensor as a suction air temperature detection means for detecting tR), wherein both sensors (10), <11
) and the proportional control valve (8) are connected to the controller (above) for controlling the operation of the refrigeration system (A) so as to be able to send and receive signals.

The internal configuration of the controller (above) is shown in FIG. In the same figure, (MC) is a compressor motor, (
MFl) is a variable rotation speed type evaporator fan motor such as a pole change type, and (MFz) is a blower fan motor for the air-cooled condenser (3).

(10C) operates the compressor motor (MC) at the same time as the blower fan motor (MF2) of the air-cooled condenser (3).
), the compressor relay has a normally open contact (1QC-+) that allows energization, (2081) is the refrigerant pipe (6) in Figure 2
This is a solenoid valve that is interposed in the closed circuit (7) to allow or block the flow of refrigerant in the closed circuit (7). Furthermore, (88FL) is a low-speed side evaporator fan relay (88FH1), (88FH2), and (88FH) having normally open contacts (88FL-+) that rotate the two evaporator fan motors (MF+) at low speed.
3) are normally open contacts (88) that turn on simultaneously to rotate the two evaporator fan motors (MF+) at high speed.
FH1-+ ), (88F8.2-+ ), (88FH
3 high-speed side evaporator fan relays with
(TM) is the above low speed side evaporator fan relay (88FL)
A normally open contact (TM) that delays the ON operation of the
-1) with a delay timer having an evaporator fan (5
When switching the rotation speed from the high speed side to the low speed side in a), it prevents abnormal current such as reverse current caused by inertia from occurring in the evaporator fan motor (MF+), and prevents reverse torque, burnout, etc. This is to prevent it from happening. In addition, (THl) is a defrost completion temperature sensor that detects the completion of defrost operation based on the ambient temperature of the evaporator (5), and (15) is, for example, +
Inside the refrigerator within the temperature setting range of 13℃~--20℃
! A temperature setting device as an internal temperature setting means for setting X(tSp), the defrost completion temperature sensor (TH
+) and temperature setting device (15) are input to the controller (described above). And, inside the controller 1-roller (above), the blowing air temperature sensor (10) is installed.
, suction air temperature sensor (11) and m position setting device (15)
) is provided with a CPU (22>) which receives each signal from the A/D converter (20) and an I10 board (21).The CPU (22) operates based on the flowchart in FIG. At the same time, the proportional control valve (8
), compressor relay (10C), 'R solenoid valve 2081).

(2082>Normal Hini Evaporator) 7-inch relay (88FL),
(88FH1), (88FH2), (88F)-1'3
) and timer (TM) respectively for opening control and 0N.
-OFF control.

In the figure, (14) is a high/low pressure switch that detects the discharge pressure and suction pressure of the compressor (1), and (60W) is a water switch that opens when circulating cooling water to the water-cooled condenser (3). This is a pressure switch that stops the blower fan motor (MF2) of the air-cooled condenser (3) when it is opened.In addition, in Figures 2 and 3, (31) is a pressure switch equipped with a heat exchanger. Accumulation receiver, (Tr > is transformer, (S) is run/stop switch, (32) is manual defrost switch, (34) is hydraulic protection pressure switch, (35) is lamp switch, (36) is hydraulic reset Switch, (37) is compressor protection thermostat, (38) is overcurrent relay, (39)
- (45) are manual switching switches, all of which are interlocked, and (39).

(45) is for voltage switching, (40) is a transformer (Tr) °
(41) is the auxiliary relay (X+) for switching the wiring connection.

(x2), (43) and (44) are for compressor motor (MO
) is for use. Also auxiliary relay (X+).

(x2) are the supply voltage switching contacts (x1-+) to the blower fan motor (MF2) of the air-cooled condenser 3), respectively;
(X2-+). (46) is a supply voltage switching transformer, (47) is a ROM, and (48) is a RAM.

Next, the operation of the controller (above) will be explained based on the flowchart in FIG.
(Sr) indicates the step number).

First, turn on the power at (SA), then turn on the power at (SB).
In warm r! 1 Based on the signal from the setting device (15), the set internal temperature (tSp) is set to the predetermined partial freezing-refrigeration operation switching temperature (
tPF) (e.g. -8°C), and if it is less than YES, it is determined that the refrigeration operation mode is selected, and at (Sc), the suction air temperature surface sensor (1
After selecting 1), the suction air m at (So)
The refrigeration operation according to the signal from the temperature sensor (11) is started based on the flowchart of FIG.

On the other hand, if the set internal temperature (tSp) is equal to or higher than the predetermined partial freezing/freezing operation switching temperature (tPF) at (Ss), then the set internal temperature (tSp) is set at (SB).
p) is compared with a predetermined refrigerating/partial freezing operation switching temperature (tCP) (for example, -3°C), and if YES is below the switching temperature (tCP), it is determined that the partial freezing operation mode is selected. , (SF), the intake air temperature sensor (
11), the partial refrigeration operation according to the signal of the suction air temperature sensor (11) is selected in (Sc).
The process starts based on the flowchart in the figure, and if the above-mentioned predetermined refrigeration/partial freezing operation switching temperature (t c p ) is exceeded, it is determined that it is time to select the refrigeration operation mode, and the blown air is switched off at (SH). After selecting the hybrid sensor (10), in (SI), select the discharge air temperature sensor (
10) Start the refrigeration operation in response to the signal.

Next, the refrigeration operation mode will be explained based on the flowchart in FIG. 5 and the schematic diagram in FIG.
), the low-speed side evaporator fan relay (88FL) is turned ON, and the three high-speed side evaporator fan relays (88FL) are turned ON.
FH1), (88FH2), (88FH3) to 0FFl
After driving the evaporator fan (5a) at a low rotation speed to obtain a low filtration, the suction air fil (tR) is compared with the set internal temperature (tSpi) in (Sob), and the set internal temperature ( If the answer is NO below t sp ), it will remain on standby;
), the proportional control valve (8) is controlled to close and the solenoid valve (2082) is controlled to be OFF in (SB2). After that, the mra valve (2081) is opened at N (So s ), and after waiting for the low pressure side of the high/low pressure switch (14) to close at (SB4), the compressor relay (I O.C.
) is turned ON to start operating the compressor (1), and performs full capacity operation at a low air volume. Then, at (Sos), the suction air temperature (tF?) is set to the chamber temperature (tS
Compare the size with p), and if No, the temperature exceeds the set internal temperature (t3p), full capacity operation will continue under low air volume, while if YES, the internal temperature falls below the set internal temperature (tap). In order to stop the operation (Soy), the N solenoid valve (20
81) and start pump down operation, (SO8)
Smell r: After waiting for the low pressure side of the high/low pressure switch (14) to open (SC9), the compressor relay (10
C) is turned OFF to stop the operation of the compressor (1). Then, at (Solo), the suction air temperature (t
R) is the restart start humidity (te3) of the compressor (1) (ta
33tsp+Δt 13>t5p, Δt 13 is a differential, for example, 3°C), and if No is lower than the restart start temperature (tox), the compressor (1)
While maintaining the stopped state, the restart starting temperature (te3>
If the answer is YES, return to (Sot) and resume full capacity operation. Therefore, by repeating ON-OFFIIIm of the compressor relay (10C) based on the above flowchart, the intake air ma (tR) converges to the set chamber temperature (tSp) based on the signal of the intake air temperature sensor (11). The refrigeration operation control means (two) are configured to perform ON-OFF control of the compressor (1).

Next, the partial refrigeration operation will be explained with reference to the flowchart of FIG. 6 and the schematic diagram of FIG. 8. First, (Sc+)
, the suction air mIt (tR) is converted to the capacity control operation switching temperature (t2) (t2 is, for example, the set chamber temperature tsp
differential upper limit (tz+
Compare the size with Δt2 and Δt2 (for example, 0.5°C), and if YES is greater than or equal to the upper limit (t3), it is determined that full capacity operation of the refrigeration system (A>) is required, and ( S.G.
After closing the proportional control valve (8) and turning off the solenoid valve (2OS2) in 2) to perform full capacity operation, the solenoid valve (2081) is opened in (Sc3), and the high and low pressure is adjusted in Ic (SG4). Pressure switch (14
Wait for the low pressure side of ) to close, then turn on the compressor relay (<100) at (Scs)
) to start operation, and to control the air volume (SC).
, 6), the intake air temperature (t R) is IN! Crush switching temperature (tHL) (tHL is the above temperature setting device (
15), which is higher than the upper limit of the internal temperature setting range (+13°C), for example, set to +15°C), and if tR>tHL is YES, l1lffi should be controlled to decrease ( Scy ), the low-speed side evaporator fan relay (88FL) is turned ON, and the three high-speed side evaporator fan relays (88FH1) are turned ON.

By controlling (88FH2) and (88FH3) to turn off, the evaporator fan motor (MF+) is driven to rotate at low speed and returns to the above (Scs>), and from then on, the suction air temperature (t R) changes to the air volume switching temperature (to The above-mentioned air volume reduction control is maintained until No less than (Se e ) r
t R≦t HL 17) N Ok: Then, considering the hunting of the intake air temperature, it is judged that it is necessary to increase the air volume at an early stage, and the synthetic leather increases the air volume. (SC8
), turn the low speed side evaporator fan relay (88FL) to O.
FF control and 3 high speed side evaporator fan relays (8
8FH1).

By controlling (88FH2) and (88FH3) ON fl, the evaporator fan motor (MF+) is driven to rotate at high speed, and full capacity operation is performed under a high air volume. and,
In (SC9), the intake air 11m (tR) is compared in magnitude with the full capacity-capacity control operation switching temperature (t2), and N exceeds the switching temperature (t2).

In the case of YES, the full capacity operation of the refrigeration system (A) is continued under high air volume, while if the temperature falls below the switching temperature (jz)
In this case, it is determined that it is necessary to control the refrigeration system (A>) under high air volume, and the process proceeds to (SG11).On the other hand, in the above (Sc+), the suction air temperature (t R) is equal to or less than the total capacity -
If No, the capacity control operation switching temperature (t2) is less than the differential range cell upper limit value (t3), compare the intake air temperature (t R) with the full capacity-capacity control operation switching temperature <t2) at (SGlO). However, in the case of No, which exceeds the switching temperature (t2), it is determined that full capacity operation of the refrigeration system (A) is necessary, and returns to (Se2), while the temperature is lower than the switching temperature (t2). If YES, it is determined that capacity control operation of the refrigeration system <A> is necessary (SG3'),
Proceed to (SGn) via (SG4'), (SG5') and (SGs').

Solenoid valve (2082
) is controlled to ON to reduce the flow rate of liquid refrigerant to the evaporator (5), and at (Sc+z), the proportional control valve is activated based on the set internal temperature (tSp) and the intake air temperature (tR). (8) Proportional value (P), integral value (
After calculating the differential value (D) and (SCl
In 2), the opening of the proportional control valve (8) is controlled based on each of these (P), (1), and (D) to perform capacity control operation of the refrigeration system (A) under a high air volume. After that, (S01
In step 4), the suction air temperature (tR) is compared in magnitude with the capacity control-stop switching temperature (t4) (-set chamber temperature tsp), and if the temperature falls below the switching temperature (t4), the operation should be stopped (,
After controlling the ft11 valve (2081) and the proportional control valve <8) to close at (Sc+s) and controlling the N magnetic valve (2082> to turn OFF), at (SCl2), the low pressure side of the high/low pressure switch (14) is closed. Attending the opening operation (SCl2)
At this point, the compressor relay (10C) is turned off to stop the operation of the compressor (1).

Subsequently, the intake air temperature (tR) at (Sc, ts)
The differential upper limit value of the capacity control-stop switching temperature (t4) (14+Δt43j5, Δt4 is, for example, 1 to 2
℃), and if NO is less than the upper limit value (tS), the compression III (1) operation stop control is continued, while if YES is more than the differential upper limit value (tS), the high Jl In order to perform capacity control operation of the refrigeration system W (A) under the
1) Open and control the solenoid valve (2O32) to ON, and at the same time, at (Sc, ?a), turn on the proportional control valve (8) based on the proportional value (P), integral value (■), and differential value (D). The opening is controlled, and (SG2+) is used to control the high and low pressure switch (
14), wait for the low pressure side to close (SG22), turn on the compressor relay (10G), and turn on the refrigeration system (SG22).
Resume A) at 11 M till.

Next, in (SG23), the suction air temperature (tR) is compared in magnitude with the differential upper limit value (tS) of the full capacity-capacity control operation switching temperature (t2), and if NO is less than the upper limit value (tS), While continuing capacity control of the refrigeration system (A), if YES is greater than the upper limit value (tS), it is determined that full capacity operation of the compressor (1) is necessary, and (S
c24), the solenoid valve (2082) is turned off and the proportional control valve (8) is controlled to close, thereby turning on the refrigeration system (A).
Full capacity operation will begin. And in order to control rumors (
Sc, s), the suction air temperature (tR) is compared with the wind turbine switching temperature (tHL), and if tR>tHL (YES), the low speed side evaporator fan relay ( 88FL), and three actual speed side evaporator fan relays (88FH1'),
(88Fl-above), (88FH3) to 0FFII
From J Osurukotoni, drive the evaporator fan (5a) to rotate at low speed, return to the above (SG25), and adjust the intake air temperature (t
The air volume reduction control described above is maintained until R) reaches NO, which is less than the ff1ffi switching temperature (toL), and full capacity operation under a low air volume is continued. And in the above (SG25) t
When R≦tHL (No), it is judged that the air volume needs to be increased and the low speed side evaporator fan relay (88FL) is turned off in order to increase the Ji amount (SG27).
and three high-speed side evaporator fan relays (88F
By controlling ON H1), (88FH2), and (88FH3), the evaporator fan (5a) is rotated at high speed to perform full *m operation under high Jlffi. and,
After that, in (SG28), the suction air temperature (t・) is compared with the full capacity-capacity i control operation switching hot injection (jz),
If NO exceeds the switching temperature (t2), full capacity operation of the refrigeration system (A) continues under the above-mentioned high air volume, while if YES below the switching temperature (t2), (SG+
+) and start the capacity control operation of the refrigeration system ft(A) under the air volume of ai%i. Therefore, by controlling the opening of the proportional control valve (8) according to the suction air temperature (tR) based on the flowchart 1- in FIG.
A partial refrigeration operation control means (28) is configured to control the capacity of the refrigeration system (A>) so that R) converges to the set internal temperature (t5p).In addition, (SG23) becomes YES. (SG
25) is a more special case.

Although the refrigeration operation is not shown, in the flowchart of FIG.
The blown air mr! ! J(tS), and thereby the proportional control valve (8) is positioned according to the outlet air temperature d(tS) to adjust the outlet air temperature (tS).
) to converge to the set internal temperature (tSp).
Refrigeration operation control means (which controls the capacity of f(A))
27).

In addition, in (SE) of the flowchart in FIG.
When NO exceeds (t c p ), the refrigeration operation mode is selected at (S+) and the refrigeration operation control means (27
), while operating Y below the switching temperature (t c p ) and above the predetermined partial freezing-refrigeration operation switching temperature (tpp).
In the case of ES, the partial freezing operation mode is selected in (Sc) and the partial freezing operation control means (28) is activated;
Further, if the set internal temperature (tSp) is lower than the predetermined partial freezing-freezing operation switching temperature (tPF) (YES in (S[3)), the freezing operation mode is selected in (So) and the freezing operation control means ( 29) constitutes an operation mode switching means (30). Also, the fifth
(SDo) in the refrigeration operation mode in the figure and (Scs) to (Scs), (SG) in the partial refrigeration operation mode in Fig.
25) to (SG27) receive the output of the operation mode switching means (30) to rotate the evaporator fan (5a) at low speed in the freezing operation mode, while changing the intake air temperature ( Ill amount switching temperature (t 1-IL) (t 1-IL-15
℃), rotate the evaporator fan (5a) at low speed,
The intake air temperature (tR) is the above III amount switching temperature (tHL).
) The air volume control means (31) is configured to rotate the evaporator fan (5a) at high speed under the following conditions.

In addition, in the capacity control of the cooling 2 device (A) when the partial refrigeration operation mode is selected, P of the proportional control valve <8),
1. The ttfltjt control (Sc+3) according to the D value is
Limiting the upper limit of the supply voltage to the proportional control valve (8) to 50% of the refrigeration operation mode selection, or changing the differential operation value (D) of the supply voltage to the proportional control valve (8) to a slightly larger value. This prevents the convergence to the set internal temperature (tSp) from becoming too slow due to an increase in the amount of hot gas bypass.

Therefore, in the above embodiment, the operation mode of the refrigeration system (A) is set to three modes: a refrigerating operation mode, a freezing operation mode, and a partial freezing operation mode, depending on the set internal temperature (tSp).
mode, and in this partial refrigeration mode, capacity control of the refrigeration system (A>) is performed based on the suction air temperature (tR), and as shown in FIG.
) exceeds the full capacity-capacity control switching temperature (tz), the refrigeration system ff(A) is operated at full capacity, and the suction air temperature (tR) shifts to the set internal temperature (tap). On the other hand, below the switching temperature rf1 (tz), the capacity of the refrigeration system (A) is reduced by the proportional control valve as the intake air temperature (tR> decreases toward the set internal temperature (t3p)). (8) Opening control and switching solenoid valve (2082
> is gradually reduced by ON control, and the suction air temperature (t
R) gradually moves toward the set internal temperature a (tSp), and when the set internal temperature (tSp) is reached, the compressor (1) stops, and then the intake air temperature (t R) naturally rises. When the differential upper limit value (tS) of the capacity ffi control-stop switching temperature (t4) is reached, the compression 1m (1) is restarted and the suction air temperature (t R) repeats the movement toward the set internal temperature (tSp).

At this time, the capacity control of the freezer (A) is performed based on the suction air temperature (tR), which is almost equal to the product temperature, so the product temperature can be well converged to the set internal temperature (tSp). Therefore, the freshness of frozen stored items can be well maintained for a long period of time.However, since the cooling capacity corresponds well to the load by controlling the capacity of the refrigeration device (A), the blown air m
It is possible to prevent a significant drop in a (t R) below the product temperature, suppress deterioration of protein in the partially frozen stored product, and improve the cooling storage performance of the partially frozen stored product. Furthermore, the reliability can be improved by reducing the frequency of on/off of compression tII(1).

In addition, in the refrigeration operation mode, the evaporator fan (5a) is operated in the J! Since it is always driven at a low rotation speed by the Im control means (31), energy can be saved accordingly.

Roughly speaking, in each operation mode of refrigeration and partial freezing, if the intake air temperature (tR) of the intake air temperature sensor (11) exceeds the air volume switching temperature (tit,), the internal temperature compensation is originally equalized. The evaporator fan (5a
) is driven at low rotation speed by the air volume control means (31), it is possible to increase the substantial cooling capacity of the refrigeration system (A) and save energy. Also, suction air '4
When 411K (t R) is below the air volume switching temperature (toL), the evaporator fan (5a) Since the 1ita1 control means (31)r is driven at high rotation speed, good cooling preservation performance of each stored item in the refrigeration and 9-part freezing is ensured. Here, the switching change from low rotation to high rotation of the evaporator fan (5a) is performed by switching IIm 'a11' when the decrease in the intake air temperature (t R) is at a high temperature value.
[(t HL ) is reached, so the increase in heat entering the refrigerator due to the increase in air volume is small, and there is sufficient cooling capacity in the refrigeration system (A), which causes an increase in the intake air temperature. Never.

As a result, the suction air of 4 m smoothly converges to the set internal temperature (tSp) in a short time without hunting. Therefore, it is possible to eliminate the adverse effects caused by hunting on electrical components such as relays, and to further improve the cooling storage performance of refrigerated items and 113-minute frozen items. Moreover, since the air volume switching temperature (ti) is set to a higher value (+15℃) than the upper limit (+13℃) of the internal temperature setting range (+13℃ to -20℃), The set internal temperature (tSp) for refrigerated items is within the range specified above (upper limit of +13°C).
), it is also possible to ensure good cooling storage performance for the refrigerated items.

In the above embodiment, when the partial refrigeration operation mode is selected, the compressor (1) is controlled ON-OFF while hot gas bypass is performed based on the change in the opening degree of the proportional control valve (8), and the suction air temperature ( tR) to converge to the set internal temperature (tSp);
As shown in the figure, it is of course possible to set the capacity control/stop switching humidity (t4) slightly lower than the set internal temperature (tSp) and operate the compressor (1) continuously. .

In this case, although the power consumption increases slightly due to continuous operation of the compressor (1), the frequency of starting and stopping the compressor (1) decreases over time, which is effective in improving its reliability. Moreover, the suction air m degrees (tR) and the Suita air temperature (tS
), the temperature difference (tS - tR) between the temperature and the temperature difference (tS - tR) becomes smaller, so it is possible to suppress the deterioration of freshness, putrefaction, or protein deterioration of partially frozen stored products due to the cold air blowing out, and improve the storage performance of partially frozen stored products. can be further improved.

(Effects of the Invention) As explained above, according to the refrigeration equipment operation control device according to the present invention, in addition to the refrigeration operation mode and the freezing operation mode, the refrigeration equipment capacity control based on the evaporator intake air temperature can be performed. Since we have added three partial freezing operation modes, it is possible to maintain the freshness of partially frozen stored items during cooling storage, and at the same time prevent protein deterioration, and also reduce the frequency of compressor startup/stopping. It is possible to reduce food intake. Moreover, during freezing operation, the evaporator fan is always driven at low rotation speeds to save energy, and during refrigeration and partial freezing operations, the evaporator fan is turned on at the ffl amount switching temperature, which is higher than the upper limit of the internal temperature setting range. The rotation speed is switched high and low, and when the air volume switching temperature is exceeded, the evaporator fan is driven at low speed to further save energy, and when the air volume is below the air volume switching temperature, the evaporator fan is driven at high speed to improve the internal temperature distribution. In addition, when the evaporator fan is switched from low rotation to high rotation drive at the above air volume switching temperature, the increase in intake air temperature is effectively suppressed and hunting is prevented, so that the intake air temperature convergence to the set internal temperature can be ensured well. Therefore, it is possible to greatly contribute to improving the cooling storage performance of refrigerated stored items and partially frozen stored items, and it is also possible to effectively improve the reliability of the compressor and electrical components.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. Figures 2 to 11 show embodiments of the present invention, and Figure 2 is a marine container cold 2! ll equipment refrigerant piping system diagram, Part 3
Figure 4 is an electric circuit diagram, Figure 4 is a flowchart diagram showing the basic operation of the controller, Figures 5 and 6 are flowcharts 1 to 7, and Figures 7 and 6, respectively, showing details of the refrigeration operation mode and partial refrigeration operation mode. FIG. 8 is a schematic diagram showing each operation mode of refrigeration operation and partial refrigeration operation, respectively.
FIG. 9 is an explanatory diagram of the operation, FIG. 10 is a diagram corresponding to FIG. 8 showing a modification of the partial refrigerating operation mode, and FIG. 11 is an explanatory diagram of the operation in the partial refrigerating operation mode of FIG. 10. (A>...refrigeration equipment, (1)...compressor, (5)...
... Evaporator, (5a) ... Evaporator fan, (8) ...
・Proportional control valve, (10)...Blowout air! 11 sensors,
11)...Suction air temperature sensor, (above)...Controller, (MF+)...Evaporator fan motor, (
88FL)...Low speed side evaporator fan relay, (88F
H1), (88F) - above)... High-speed side evaporator fan relay, (15)... Leak setting device, (27)... Refrigeration operation control means, <28)... Partial freezing operation Control means (2)... Refrigeration operation control means, (30)... Operation mode switching means, (31)... Air volume control means. Figure 2: Mouth

Claims (1)

[Claims] (1) Blowing air temperature detection means (
10), suction air temperature detection means (11) for detecting the suction air temperature (t_R) by the evaporator fan (5a) of the evaporator (5), and chamber temperature setting means (11) for setting the chamber temperature.
15) and the signal from the above-mentioned outlet air temperature detection means (10), the outlet air temperature (t_S) is set to the set internal temperature (t_S).
Based on the signals from the refrigeration operation control means (27), which controls the capacity of the refrigeration system (A) so that the capacity converges to _P), and the above-mentioned suction air temperature detection means (11), the suction air temperature (t_R) is adjusted to the set temperature (t_S_P). ) to converge on the refrigeration equipment (A).
and a compressor (1) so that the suction air temperature (t_R) converges to the set internal temperature (t_S_P) based on the signal from the suction air temperature detection means (11). A refrigeration operation control means (29) for ON-OFF control, and a set refrigerator temperature (t_S_P) by the refrigerator temperature setting means (15) to a predetermined refrigerating/partial freezing operation switching temperature (t_C_P) and a predetermined partial freezing/freezing operation. Compared with the switching temperature (t_P_F), the set internal temperature (t
_S_P) is the predetermined refrigerating partial freezing operation switching temperature (t_C
_P), the above-mentioned refrigeration operation control means (2
7) at the predetermined refrigeration-partial freezing operation switching temperature (t_C_P
), the predetermined partial freezing-refrigeration operation switching temperature (t_P_F
) or above, the partial refrigeration operation control means (28) is operated, and when the temperature is lower than the predetermined partial refrigeration-freezing operation switching temperature (t_P_F), the refrigeration operation control means (29) is operated. , receives the output of the operation mode switching means (30), and rotates the evaporator fan (5a) at a low speed in the freezing operation mode, while in the refrigerating operation mode and the partial freezing operation mode,
When the suction air temperature (t_R) exceeds the air volume switching temperature (t_H_L), which is higher than the upper limit of the internal temperature setting range, the evaporator fan (5a) is rotated at low speed and the suction air temperature (t
air volume control means (31) that rotates the evaporator fan (5a) at high speed when the air flow rate (R) is below the air volume switching temperature (t_H_L);
) An operation control device for a refrigeration system.