JPS624623A - Refrigerating cycle device for vehicle - Google Patents

Abstract

PURPOSE:To allow a refrigerator to be independently operated regardless of the actuation of a switch for cooling by configurating a device in such a way that the device is provided with such items as a medium circuit for cooling having an evaporator, a control valve which controls the medium flow to the medium circuit, and a means of controlling the closing operation of the said valve, and the medium flow to the evaporator is suspended when the refrigerator is separately operated. CONSTITUTION:Refrigeration medium circuits 8 and 80 for cooling are arranged in parallel with a refrigeration medium circuit 16 for refrigeration. When both refrigerating and cooling are being operated simultaneously, the intermittent make and break action of solenoids 7 and 70 allows the medium to flow into evaporators 5 and 50 for cooling and into an evaporator 18 for refrigerating one after the other permitting the function of both cooling and refrigerating to be available simultaneously. On the other hand, when the refrigerating is being separately operated, the suspension of the medium flow to the evaporators 5 and 50 with the solenoids 7 and 70 closed and with the operation of a compressor intermitted, allows the refrigeration to be accomplished while the capacity of the compressor is set so as to correspond to the cooling capacity of a refrigerator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicular refrigeration cycle device that has both a cooling function and a refrigerator function.

[Prior art] A conventional refrigeration cycle device of this type is disclosed in, for example, Japanese Patent Application Laid-open No. 58
As proposed in Publication No. 11370, the refrigerant circuit for refrigeration (
(including a refrigeration pressure reducing device and a refrigeration evaporator),
By alternately flowing the refrigerant into the cooling evaporator and the refrigeration evaporator, an evaporation temperature as low as about -21° C., which allows ice to be made, is obtained in the refrigeration evaporator.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional device, when operating the refrigerator, it is necessary to first turn on the cooling switch to put the cooling device into an operating state, and then turn on the refrigerator switch.

Therefore, there is a problem in that even in the mid-season when there is little need to operate the air conditioner, such as in spring and autumn, if the function of a refrigerator is desired, the air conditioner must be operated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a refrigeration cycle device for a vehicle that can independently operate a refrigerator regardless of whether or not a cooling switch is turned on.

[Means for Solving the Problems] In order to achieve the object 1-, the present invention includes (a) a compressor driven by an al vehicle engine; (e) a cooling refrigerant circuit provided on the refrigerant suction side of the compressor in parallel with the cooling refrigerant circuit and having a refrigeration pressure reduction device and a refrigeration evaporator; (d) an electric control valve that controls the flow of refrigerant to the cooling refrigerant circuit; and (e) an electric control valve that turns on and off the electric control valve during simultaneous cooling and refrigerating operation when both the cooling switch and the refrigerator switch are turned on. a first control means for controlling the opening and closing of the compressor; a control means; (during independent cooling operation when only the cooling switch is turned on, the electric control valve is opened to allow refrigerant to flow to the cooling evaporator; on the other hand, during independent cooling operation when only the refrigerator switch is turned on); and a third control means for closing the electric control valve to cut off the flow of refrigerant to the cooling evaporator.

[Effect]

According to the above technical means, during simultaneous cooling/refrigeration operation in which the cooling switch and the refrigerator switch are turned on, the first control means intermittently controls opening and closing of the electric control valve, thereby controlling the cooling evaporator and the refrigeration evaporator. By circulating refrigerant alternately through the container, it is possible to achieve cooling and refrigeration effects at the same time.

On the other hand, when only the refrigerator switch is turned on and refrigeration independent operation is set, the third control means closes the electric control valve to cut off the flow of refrigerant to the cooling evaporator and stop the cooling action. By intermittent operation of the compressor by the control means 2, the compression function corresponding to the refrigerator cooling capacity can be set, and the refrigeration effect can be exerted.

〔Example〕

The present invention will be explained below based on an embodiment shown in the drawings.

Fig. 1 shows a refrigeration cycle when the present invention is implemented in conjunction with a twin cooler for a wagon. 1 is a compressor that compresses and discharges refrigerant, and the driving force of the vehicle running engine (not shown) is It is operated by receiving power via an electromagnetic clutch 11. 2 is a condenser that cools and condenses the high-temperature, high-pressure gas refrigerant discharged from the compressor 1, and 3 is a liquid receiver that receives the refrigerant condensed in the condenser 2 and draws out only liquid refrigerant. A is a front side cooling unit installed at the lower part of the instrument panel in the front part of the vehicle interior, 4 is a cooling pressure reducing device that decompresses and expands liquid refrigerant into a low-temperature, low-pressure mist, and 5 is a cooling evaporator. The pressure reducing device 4 is a temperature-activated expansion device that changes the amount of throttling in accordance with the signal pressure (pressure according to the refrigerant temperature at the evaporator outlet) from a temperature-sensitive cylinder 4a disposed on the outlet side of the cooling evaporator 5. It is composed of a valve and controls the flow rate of the refrigerant so that the degree of superheating of the refrigerant at the outlet of the cooling evaporator 5 is constant. The front cooling unit A blows air from inside the vehicle or outside the vehicle using a blower 6.
After the intake air is cooled by the evaporator 5, it is passed through a heater unit (not shown) to the head of the passenger in the front seat through upper air outlets (not shown) provided at the center and left and right sides of the front of the vehicle interior. It is designed to blow out towards the target. A solenoid valve 7 controls the flow of refrigerant in the cooling refrigerant circuit 8 having the pressure reducing device 4 and the evaporator 5. A temperature sensor 9 is a thermistor that detects the temperature of the cold air that has passed through the cooling evaporator 5. B is a rear side cooling unit installed under the floor behind the passenger seat in the vehicle interior, and cools the passengers in the rear seats of the vehicle interior.
Equipment similar to the front side (40°40a, 50.60,
70,80.90). The front and rear cooling refrigerant circuits 8 and 80 are connected in parallel to each other.

Reference numeral 100 denotes a cooling control device in which the detection signals of both temperature sensors 9 and 90 are inputted manually, and when the temperature of the cold air on the front side drops below the set temperature, the energization to the solenoid valve 7 is cut off in response to the signal from the temperature sensor 9. When the solenoid valve 7 is opened and the temperature of the rear cold air drops below the set temperature, the temperature sensor 9
The electromagnetic valve 70 is configured to receive a signal from the electromagnetic valve 70 and cut off current to the electromagnetic valve 70 to close the electromagnetic valve 70. In other words, the control device 100 independently controls the flow of refrigerant to the two cooling refrigerant circuits 8, 8o to prevent frost from forming on the evaporators 5, 5°. Further, when the control device 100 simultaneously cuts off the power to the two solenoid valves 7.70, the control device 100 activates the relay 11.
The compressor 1 is configured to be driven to an open state to cut off power to the electromagnetic clutch 11 and stop the compressor 1. In addition,
I4 is the ignition switch of a car engine, 15
is the vehicle's power battery. Reference numeral 16 denotes a refrigerant circuit for refrigeration, which is provided in parallel with the two refrigerant circuits 8 and 80 for cooling. In the middle of this circuit 16, constant pressure expansion valves 17 forming a decompression device for refrigeration are sequentially installed in the direction in which the refrigerant flows. , refrigeration evaporator 18. A check valve 19 is connected.

Constant pressure expansion valve 1 This is a type of expansion valve that opens when the pressure on the low pressure side is below a set value and can control the low pressure side to a constant pressure. In this example, R-12 is used as the refrigerant.
The set valve opening pressure of the constant pressure expansion valve 17 is 0.5 kglcra
G (evaporation temperature -21"C).

The above-described evaporator 18 for a refrigerator includes a freezing evaporator section 18a.
and a refrigerating evaporator section 18b, the former 18
a is installed in the freezer compartment 20, and the latter 18b is installed in the refrigerator compartment 21.
is installed inside. Inside this refrigerator compartment 2I, there is a blower 2.
2. A temperature sensor 23 made of a thermistor is installed. This temperature sensor 23 is provided in the refrigerator compartment 21 at a position where it is not directly hit by the blown air flow, and detects the temperature inside the refrigerator compartment 21 . C shows the whole refrigerator-freezer,
The specific structure of this refrigerator-freezer C is described in Japanese Patent Application Laid-open No. 58
It is the same as that described in JP-11370.

Reference numeral 200 denotes a refrigerator control device that controls the operation of the blower 22 and the electromagnetic clutch 11 based on the opening/closing signal of the refrigerator switch 24 and the detection signal of the temperature sensor 23.
The opening and closing of the electromagnetic valves 7 and 70 are controlled via the cooling control device 100.

FIG. 2 shows the entire electric circuit including the control devices 100 and 200. First, the cooling control device 100 will be explained. Reference numerals 101 and 102 are first and second comparators that determine whether or not the engine speed is above a set value;
A human power signal is applied from a frequency-voltage conversion circuit 103 that converts the pulse signal generated by the frequency-voltage conversion circuit 103 into a DC voltage. 104 is a third comparator that determines whether the temperature detected by the temperature sensor 9 of the front side cooling unit l-A is higher than or equal to the set value, and 105 is a third comparator that determines whether the detected temperature of the temperature sensor 9o of the rear side cooling unit B is higher than or equal to the set value. 106 to 111 are AND circuits, 112 is an OR circuit, and 113 to 116 are transistors. 117 is a solenoid valve of an idle up device that increases the idle speed of the automobile engine.

As described above, the relay 118 controls the electromagnetic clutch 11. 119 is a blower switch for the front side cooling unit; 120 is a blower switch for the rear side cooling unit B; in this example, this blower switch 11
Reference numeral 9,120 also serves as a cooling switch for stopping the operation of the cooling device. Reference numerals 121 and 122 are blower relays.

Next, the refrigerator control device 200 will be explained.
1 is a timer circuit, 202 is a comparator for determining whether the temperature detected by the temperature sensor 23 is higher than a set value, 203 is an AND circuit, 204 is a transistor, and 205 is a relay. The refrigerator switch 24 is configured to select three positions: a stop position (OFF>), a refrigerated position (cOOL), and a frozen position (ICE).

The timer circuit 201 sets the switch 24 to C00L.
When it is inserted into the position, "1" is output to the first input terminal 201a.
By inputting a level signal, TI ” 10
A pulse signal of T2=120 seconds is generated at the output terminal 201b, and when the switch 24 is turned to the ice position, a "1" level signal is input to the second input terminal 201C. A pulse signal of TI = 15 seconds and Tz = 60 seconds is generated at the output terminal 201b. Note that when the switch 24 is in the OFF position, the output of the timer circuit 201 is always at the "0" level.

Next, the operation of this embodiment in the above configuration will be explained. First, in summer, etc., when cooling both the front and rear parts of the vehicle interior, the blower switch 1, which also serves as the cooling switch, is used.
19.120 Hi w L.

Insert it in either position. As a result, relay 12
1 and 122, and the current supply circuit to the blowers 6 and 60 is closed, so that the blowers 6 and 60 operate at speeds corresponding to the closed positions of the switches 119 and 120, respectively.

At the time of starting cooling, the detected temperatures of temperature sensors 9 and 90 are sufficiently higher than the set temperature, so temperature sensors 9.
The resistance value of 90 is the set value T in comparator 104 and 105.
It is smaller than F2 and TR2. As a result, the outputs of comparators 104 and 105 go to "L" level, and AND circuits 109 and 110 and AND circuits 108 and 111, respectively.
join. On the other hand, the rotational speed of an automobile engine is normally determined by a set value Sl (for example, 650r, p, m) of the comparator 102, S
2 (for example, 950 r, p, n+), the output of the comparator 102 is 1 l l lB. Also, the comparator 101 detects that the engine speed is set at the set value R1.
(for example, 1650r, p, m), it outputs an "L" level output and operates the idle up solenoid valve 117, and when it is higher than the set value R2 (for example, 1800r, p, m), it outputs an "0" level output. Outputs the output and stops the idle up operation.

By turning on the blower switches 119 and 120 described above, "
0” level signal is inverted by the inverter and becomes “1” level.
Since it is added to the AND circuit 108, 109 as a level signal, the output of this AND circuit 108, 109 becomes "l".
level, the output of the OR circuit 112 becomes "1" level, the output of the AND circuit 107 also becomes "1", the transistor 114 turns on, energizes the relay 118, and closes the movable contact 118a to the fixed contact 118b. .

As a result, the electromagnetic clutch 11 is energized and the compressor 1 is operated.

Also, at this time, since the refrigerator switch 24 is in the off state, the output of the timer circuit 201 is at the "02 level".
Therefore, both the outputs of AND circuits 110 and 111 are “
1'' and the transistors 115 and 116 are turned on, so that the solenoid valve 7.70 is energized, and this solenoid valve 7.70 opens, allowing refrigerant to flow to the evaporators 5 and 50.

Therefore, the refrigerant discharged from the compressor 1 circulates through the pipes, and when the refrigerant evaporates in the cooling evaporators 5 and 50, it takes away the heat of vaporization from the blown air, and the air that has been taken away with the heat of vaporization and cooled is It is blown into the passenger compartment by the blower 6.60. At this time, the evaporation pressure in the evaporators 5, 50 is usually 2 to 3 kg/c+
J, and therefore the pressure acting on the compressor suction side end of the refrigeration refrigerant circuit 16 is also about the same, so the constant pressure expansion valve 17
remains closed, and no refrigerant flows into the refrigerant circuit 16 for refrigeration.

Then, as the cooling action progresses, the temperature sensor 9 or 90
If the detected temperature falls below the set temperature, the output of the comparator 104 or 105 becomes "0", and the solenoid valve 7 or
is closed to prevent frosting of evaporator 5 or 50.

When both of the temperatures detected by the temperature sensors 9 and 90 fall below the set temperature, both electromagnetic valves 7 and 70 close, and at the same time, power to the electromagnetic clutch 11 is cut off and the compressor 1 is stopped.

Next, when operating the refrigerator C at the same time as the cooling operation described above, the refrigerator switch 24 is placed in the refrigerating (cOOL) or freezing (ic e) position, but in both of these positions, the timer The circuit 201 is TI (!
:A pulse signal indicated by T2 is applied to the AND circuits 110 and 111 and the OR circuit 112 of the cooling control device 100. As a result, in the AND circuits 110 and 111, the timer circuit 20
Among the output signals of 1, the output is “0” only during TI,
Solenoid valve 7.70 is closed, and conversely, AND circuit 11 is closed during T2.
The output of 0.111 becomes "l" and the solenoid valve 7°70 is opened. Thereafter, the solenoid valve 7.70 closes for the above 18 hours and opens for T2 hours (this operation is repeated. Then, when the solenoid valve 7.70 closes, the flow of refrigerant to the cooling evaporator 5.50 stops, so the compressor The suction pressure of the refrigeration refrigerant circuit 1G rapidly decreases and reaches 0.5 kg/crlG in a short period of time, for example, 3 to 4 seconds.For this reason, the constant pressure expansion valve 17 of the refrigerant circuit 1G for refrigeration opens, and the refrigerant circuit 16 At this time, the constant pressure expansion valve 17 adjusts the low pressure side pressure to the set pressure (0.5 kg/c
rAG), the inside of the refrigeration evaporator 18 has an evaporation pressure of 0.5 kg/ailG and an evaporation temperature of -21° C., and ice making is also possible in the refrigeration evaporator section 18a.

Then, after the T7 time has elapsed, the solenoid valves 7 and 70 are energized, so that the solenoid valves 7 and 70 return to the open state. Then, when the electromagnetic valves 7 and 70 open, the refrigerant is again supplied to the cooling evaporator 5.50, and the internal pressure of the evaporator 5.50 and the compressor suction side pressure return to 2 to 3 kg/cd G. This pressure is the pressure inside the refrigerating evaporator 18 (0.5 kg/cjG)
However, since the check valve 19 is disposed downstream of the refrigerator evaporator 18, the refrigerant gas that has passed through the cooling evaporator 5.50 will flow back into the refrigerator evaporator 18. , the pressure inside this evaporator 18 is not suddenly increased. On the other hand, in the constant pressure expansion valve 17, the low pressure side pressure is set to 0.
．． When the temperature exceeds 5kg/cJG, it will automatically close and stop supplying refrigerant. Therefore, the evaporator 18 continues to make ice while the liquid refrigerant therein gradually evaporates.

This state continues for 12 hours. Thereafter, by repeatedly opening and closing the electromagnetic valves 7 and 70 according to the set times T+ and Tt, the cooling effect of the vehicle interior and the cooling effect of the refrigerator C can be obtained at the same time. The operation of the refrigerating blower 22 is automatically interrupted in response to a detection signal from the temperature sensor 23.

When the refrigerator switch 24 is turned on to the refrigeration (cOOL) position, the pulse output of the timer circuit 201 becomes <TI=10 seconds, Tz=12Q seconds as described above, while the refrigeration (i
ce), the pulse output of the timer circuit 201 is T+=15 seconds.

Tz=60 seconds. Therefore, in the latter case, the time for the refrigerant to flow into the refrigeration evaporator 18 (in other words, the closing time of the solenoid valves 7 and 70) is longer, and the cooling capacity of the refrigerator C is improved, so the ice making time is longer. becomes shorter.

Next, during the intermediate seasons such as spring and autumn, refrigerator C
When not operating the cooling operation, the refrigerator switch 24 is set to the refrigeration (cOOL) or freezing (ice) position, but the blower switches 119 and 120 for cooling are turned on.
remains off.

Here, even if the blower switches 119 and 120 are off, if the ignition switch 14 is turned on,
Power is always supplied to the cooling control device 100 as well.

Since the blower switch 119.degree. 120 is in the off state, the output of the AND circuit 110.degree. 111 is always "0" and the solenoid valve 7.70 always remains closed.

On the other hand, since the outputs of the AND circuits 108 and 109 are always "O", the output of the OR circuit 112 becomes "1" for only time T6 due to the pulse output of the timer circuit 201, and this
Electromagnetic clutch 11 is energized for 9 hours, and compressor 1 is operated.

That is, when the refrigerator is operating alone, the compressor 1 repeatedly operates intermittently in accordance with the pulse output of the timer circuit 201, such as operating for T6 hours and stopping for T2 hours. As a result, refrigerant is intermittently supplied to the refrigeration evaporator 18, and the refrigerator C is cooled. Compressor 1 is designed in advance to have a large capacity (capacity) that is sufficient to ensure cooling capacity in the vehicle interior, so if compressor 1 is operated continuously when the refrigerator is operating alone, the compression function will become excessive. Undesirable. On the contrary,
In this example, by intermittent operation of the compressor 1 as described above, the compression function power corresponding to the refrigerator cooling capacity can be set, and the compressor operation rate can be reduced, which is advantageous from the viewpoint of power saving of the automobile engine.

The present invention is not limited to the illustrated embodiments described above, but can be modified in various ways. Modifications thereof will be listed below.

(11 In the above embodiment, the ignition switch 14
Although the configuration is such that power is always supplied to the cooling control device 100 when the air conditioner is turned on, power is supplied to the cooling control device 100 via the ignition switch 14 and an independently operated manually operated cooling switch. At the same time, when the refrigeration control device 200 is activated, in conjunction with this activation,
The configuration may be such that power is supplied to the cooling control device 100 regardless of the cooling switch.

(2) In the above embodiment, the temperature sensor 23 in the refrigerator C
When the detected temperature falls below the set temperature, the operation of the blower 22 is stopped, but the output of the timer circuit 201 is set to "0".
'', and the operation of the compressor 1 may be stopped. In this case, the blower 22 may remain in operation, or the blower 22 and the compressor 1 may be stopped at the same time.

(3) The cooling control device 100 and the refrigeration control device 2°O can also be integrated by a control device using a microcomputer.

(4) The opening/closing control of the electromagnetic valves 7, 7o may be controlled by detecting the degree of cooling of the refrigeration evaporator 18, in addition to using the timer circuit 2°l.

(5) Two cooling units) It goes without saying that the present invention can be similarly applied to a system in which only one cooling unit is provided without providing A and B. In this case, the solenoid valve (
7, 70), it is not necessary to open or close the compressor l, and it is only necessary to intermittent operation of the compressor l.

(6) Not limited to the solenoid valves 7 and 7o, any valve (for example, a motor control valve) can be used as long as it can be electrically controlled.

〔Effect of the invention〕

As described above, according to the present invention, not only can cooling-only operation and cooling-refrigeration simultaneous operation be performed well as before, but also refrigeration-only operation can be performed well.

Furthermore, since the refrigerator can operate independently through intermittent operation of the compressor, the compressor function power does not become excessive compared to the refrigerator cooling capacity, and the compressor operating rate can be significantly reduced. It is possible to save power.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall configuration diagram including a refrigeration cycle and an electric circuit, and FIG. 2 is a specific wiring diagram of the electric circuit section. ■...Compressor, 4.40...Pressure reducing device for cooling, 5゜50...Evaporator for cooling, 7.70...Solenoid valve forming an electric control valve, 8.80...Cooling refrigerant circuit, 16...
・Refrigerant circuit for cooling, 17... Constant pressure expansion valve forming a pressure reducing device for refrigeration, 18... Evaporator for refrigeration, 24... Switch for refrigerator, 100... Control device for cooling, 200...
・Refrigerator control device, 119.120...Blower switch that also serves as a cooling switch.

Claims (1)

[Scope of Claims] (a) a compressor driven by a vehicle engine; (b) a compressor driven by a vehicle engine;
) a cooling refrigerant circuit provided on the refrigerant suction side of the compressor and having a cooling pressure reducing device and a cooling evaporator; (c) provided in parallel with the cooling refrigerant circuit on the refrigerant suction side of the compressor; (d) an electric control valve that controls the flow of refrigerant to the cooling refrigerant circuit; (e) both the cooling switch and the refrigerator switch are turned on; (f) a first control means for intermittently controlling the opening and closing of the electric control valve during simultaneous cooling and refrigeration operation; (g) during a cooling-only operation in which only a cooling switch is turned on, the electric control valve can be opened to allow refrigerant to flow to the cooling evaporator; and third control means that closes the electric control valve to cut off the flow of refrigerant to the cooling evaporator during refrigeration independent operation in which only the refrigerator switch is turned on.