JPS6134059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator-freezer for automobiles, which is capable of cooling canned drinking water and making ice in combination with or independently of a cooling cycle.

In recent years, so-called wagons have been used for a variety of purposes as leisure vehicles. Furthermore, since there are 6 to 8 people on board, it is often necessary to cool drinks, towels, etc. while driving, and ice is often required in camps.

The present invention has been devised to meet the above-mentioned needs, and provides a refrigerator-freezer for automobiles that can effectively perform a refrigeration function for refrigerating canned drinking water, etc., and a freezing function for making ice, within a single box body. The purpose is to

According to a preferred embodiment of the present invention, a fan of an air blower, a fan drive motor, and a fan casing are installed in the box body, and a constant pressure expansion valve, a pressure switch, an evaporator, a check valve, etc. are provided in the ventilation path for cooling. A mechanism is installed to convert the air blown from the fan into cold air by passing it between the fans attached to the evaporator for refrigeration, and then blows the air onto the object to be cooled, such as a cola can, to cool it.

Furthermore, the freezer operates at the same time as the refrigerator, and the inside of the tube of the evaporator for freezing is, for example, 0.5Kg/cm ² (-
By lowering the pressure to a low pressure (equivalent to 21℃), the water in the ice tray placed on the tube of the evaporator for freezing can be converted into ice.

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a refrigeration cycle when the present invention is implemented in combination with a twin cooler for a wagon. A compressor 100 is driven by an automobile engine (not shown) via an electromagnetic clutch 101, and The refrigerant is liquefied by the condenser 102, passes through the receiver 103, and then flows into the front cooling unit 1.
A circuit including a solenoid valve 104a, an expansion valve 104b, and an evaporator 104c of 04, and a rear cooling unit 1
05 solenoid valve 105a, expansion valve 105b, and evaporator 105c, and a circuit having a constant pressure expansion valve 106 for freezing and refrigeration, a pressure switch 107, an evaporator for freezing and refrigeration 108, and a check valve 109, After passing through any of these three circuits, it returns to the compressor 100. The front side cooling unit 104 is installed at the lower part of the instrument panel at the front of the passenger compartment of the wagon car together with the above-mentioned equipment and a blower 104d.
In addition to the above-mentioned equipment, a blower 105d and the like are installed in the vehicle interior under the floor behind the passenger seat.

The evaporator 108 for freezing and refrigeration includes a evaporator section 108a for freezing and an evaporator section 108 for refrigeration, as described later.
The former 108a is the freezer compartment 1.
The latter 108b is installed in the refrigerator compartment 111.
is installed inside. Inside this refrigerator compartment 111,
Blower 112, temperature sensor 1 consisting of a thermistor
13 are installed. The temperature sensor 113 is provided in the chamber 111 at a position where it is not directly hit by the blown air flow (in the example shown in FIG. 4, it is provided in a notch in the box 1).

A control device 115 maintains the inside of the refrigerator compartment 111 at a predetermined temperature (for example, 5° C.) by intermittently controlling the operation of the blower 112 according to the temperature detected by the temperature sensor 113. The controller 115 also activates its built-in timer circuit and controls the pressure switch 107.
It also functions to open and close the solenoid valves 104a and 105a by intermittent operation. That is, in FIG. 2, the vertical axis shows the pressure P in the evaporator 108 for freezing and refrigerating, and the horizontal axis shows the time t. To explain this FIG.
The switch 107 closes when the set pressure P reaches the set pressure, for example, 1.5 kg/cm ² or higher, and the pressure switch 107 remains open until the pressure P rises to the set pressure.
Solenoid valves 104a, 105 via control device 115
energized, both solenoid valves 104a, 105a
By opening the front and rear two cooling units 10
4, Flow the refrigerant to the circuit on the 105 side. At this time, the evaporation pressure in the cooling unit 104, 105 side circuit is maintained at a pressure of 2 kg/cm ² or more by the action of the temperature-operated expansion valves 104b, 105b, while the constant pressure expansion valve 106 in the freezing and refrigeration circuit is set to open. For example, pressure
Since it is set at 0.5Kg/cm ² (corresponding to the refrigerant evaporation temperature -21°C), the valve is closed and no refrigerant flows into the refrigeration circuit. Then, if the pressure P of the refrigeration/freezer side circuit rises to the above-mentioned 1.5 kg/cm ² or more, or if the opening time of the solenoid valves 104a and 105a continues for more than a set time (for example, 1 minute), the control device 115 Then, the energization of the solenoid valves 104a, 105a is cut off, and the solenoid valves 104a, 105a are closed. As a result, the pressure P in the freezer/refrigerator side circuit rapidly decreases, the constant pressure expansion valve 106 opens, and the refrigerant flows into the freezer/refrigerator side circuit. In this state, the solenoid valve 104 is connected again by the control device 115 after the set time (for example, 15 seconds) has passed.
a, 105a is energized, and this solenoid valve 104a,
105a opens. In this way, by opening and closing the solenoid valves 104a and 105a by the control device 115, the refrigerant flows alternately into the cooling unit side circuit and the freezing/refrigerating circuit, thereby controlling the cooling effect in the vehicle interior by the cooling units 104 and 105 and the evaporator 108. Chamber 1 by
The refrigeration function in the chamber 10 and the refrigeration function in the chamber 111 are performed.

3 and 4 illustrate the specific structure of the refrigerator-freezer according to the present invention, and the box 1 of the refrigerator-freezer according to the present invention has double resin members 23a and 23b made of polyethylene, polyprolene, or the like. It has a so-called double wall structure. Furthermore, a heat insulating material 22 such as hard polyurethane is injected between the double walls to improve heat insulation properties. A door 2, which similarly has a double wall structure and a heat insulating material such as hard polyurethane, is connected to the box 1 by a hinge 3, which can be opened and closed, and the hinge 3 is fixed with screws 24. Also, a magnet 25a is attached to the peripheral edge of the door 2.
A rubber member 25 containing a built-in rubber member 25 is fixed in a U-shape, and this rubber member 25 is reliably attracted and fixed by magnetic force to an iron plate 26 fixed to the open end surface of the box body 1. The bottom of the box 1 is formed into a stepped shape, and a grid 1 for air intake is provided on the step 1a.
1 is fixed, and furthermore, the stepped portions 1b,
A cold air passage 27 through which air sucked from the grid 11 flows is formed between 1c. The evaporator storage case 15 has a double wall structure made of polyethylene or polypropylene as shown in FIG.
It is designed to be inserted into the grooves 1d and 1e of. This case 15 is formed into a substantially U-shape,
An opening 15a for a freezer compartment 110 is formed in the front of this case 15, and is opened and closed by a freezer door 16. The freezer door 16 is connected to the case 15 with a hinge 32 and fixed with screws 33.
Further, a magnet 28 is fixed to the freezer door 16, and is magnetically fixed to an iron plate 30 attached to the case 15 with screws 29. Note that the upper front of the case 15 is the refrigeration evaporator section 10.
A lattice 31 is formed extending to the front of 8b, allowing air from the blower 112 to pass therethrough.

The evaporator 108 housed in the case 15 has a structure as shown in FIG.
a freezing evaporator section 108a that cools the refrigerator compartment 1;
The refrigerating evaporator section 108b that communicates with the refrigerant evaporator section 108b is composed of a series of meandering main tubes, and a refrigerant inlet pipe 108c and a refrigerant outlet pipe 108d are connected to both ends of the main tube. Also,
A corrugated fin 8 is provided in the refrigeration evaporator section 108b so as to efficiently cool the air from the blower 112. The freezing chamber 110 makes it possible to make ice from the ice tray 13 placed on the main tube, the water in the ice making lid 17, etc. by keeping the refrigerant passing through the main tube at a low pressure of ^about 0.5 kg/cm 2 . A pressure switch 107 connected to the refrigerant inlet pipe 108c of the evaporator 108, a constant pressure expansion valve 106, and a check valve 109 connected to the refrigerant outlet pipe 108d.
etc. are all housed inside the box body 1. The refrigerant pipes 18 and 19 each protrude outside the box 1 and are connected to the refrigeration cycle shown in FIG. Check valve 109
is structured to prevent the refrigerant from flowing backward when the refrigerant pressure in the refrigerant pipe 19 on the suction side exceeds 0.5 kg/cm ² set by the constant pressure expansion valve 106. Fan casing 11 of blower 112
2a is integrally molded on the upper and lower surfaces of the box body 1 using a resin member 23b. The bell mouth portion 112b on the suction side has a shape as shown in FIGS. 7a and 7b, and is fixed to the inner resin member 23b of the box body 1 with screws 112c. This bell mouth part 11
2b is provided with a plurality of boss portions 112h, to which the bracket of the motor 112d is fixed with screws 112e. Fan 112f of blower 112
is fixed to the shaft 112g of the motor 112d. The inlet opening on the lower surface of the fan casing 112a communicates with the cold air passage 27 to suck in air as shown by the arrow in FIG. 4, and the outlet opens into the air passage ( It is connected to the corrugate fin (8 parts).

The box body 1 is equipped with a hinge 1d integrally molded with resin, and by being able to open and close at the position of this hinge 1d, it is possible to assemble the blower 112, evaporator 108, etc. into the box body 1. It is designed to make it easier. It is also possible to integrally mold the hinge 3 of the door 2 with resin, in which case the box body 1
and door 2 can be integrally molded.

Moreover, the box body 1 can be placed at an appropriate position in the vehicle interior, for example, at the 8th position.
As shown in the figure, the instrument panel 34 at the front of the wagon compartment
It is preferable to install it at a lower position or at a lower position of the seat 35.

Next, the operation of the refrigerator-freezer with the above configuration will be explained. The refrigerant from the refrigerant pipe 18 first passes through the constant pressure expansion valve 106, and by the action of this valve 106, the refrigerant is reduced in pressure to below the set pressure of 0.5 Kg/cm ² , the evaporation temperature of the refrigerant becomes -21°C, and the refrigerant is used for freezing. Evaporator section 10
8a performs the ice making action. Then, the refrigerant that has passed through the refrigeration evaporator section 108a is transferred to the refrigeration evaporator section 1.
At 08b, the blown air is cooled through the corrugated fins 8. This blown air, that is, the cold air, is transmitted from the refrigerator compartment 111→grid 11→cold air passage 27→blower fan casing 112a→refrigeration evaporator section 108b→
It circulates through the path of the refrigerator compartment 111. In addition, the grid 11
By locating it at the end of the refrigerator compartment 111 (the right end in FIG. 4), cold air is spread throughout the refrigerator compartment 111. Therefore, the canned drinking water 10 and the like in the refrigerator compartment 111 are well cooled by the forcedly circulated cold air. The cooling temperature in the refrigerator compartment 111 is determined by the temperature sensor 1.
The temperature is controlled to a set temperature by intermittent operation of the blower 112 according to the detection signal of the blower 112.

Note that the present invention is not limited to the above-mentioned embodiment and can be modified in various ways, and the arrangement of the blower 112, evaporator 108, etc. within the box 1 is not limited to that shown in the drawings, and can be implemented in various ways. It goes without saying that it can be done.

Furthermore, the refrigeration cycle for freezing and refrigeration and its control method are not limited to those described above, and can be modified in various ways. For example, the cycle for freezing and refrigeration may be configured independently from the cycle for cooling.

As described above, according to the present invention, a good refrigeration effect can be achieved by forcibly circulating cold air to the refrigerator compartment using a blower through the cold air passage formed at the bottom of the refrigerator compartment, etc. By providing a freezing evaporator section in an independently formed freezing chamber, it becomes possible to make ice, and an extremely useful effect can be obtained in practice.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a refrigeration cycle diagram, Fig. 2 is an explanatory diagram of operation, Fig. 3 is a perspective view of a refrigerator-freezer, and Fig. 4 is A of Fig. 3.
-A cross-sectional view, FIG. 5 is a perspective view of the main part of FIG. 3,
Figure 6 is a perspective view of the evaporator, Figure 7a is a top view of the blower fan casing, and Figure 7b is B of Figure 7a.
-B sectional view and FIG. 8 are schematic side views of the wagon. 1...Box body, 2...Door, 27...Cold air passage,
108a... Refrigeration evaporator section, 108b... Refrigeration evaporator section, 110... Freezer compartment, 111... Refrigerator compartment, 112... Air blower.

Claims (1)

[Claims] 1. A box having a door that can be opened and closed, a refrigerating compartment formed within the box, a freezing compartment formed independently of the refrigerating compartment within the box, and a refrigerating evaporator for cooling the refrigerating compartment. a refrigeration evaporator section that cools the freezing compartment; a blower that is installed on the air inlet side of the refrigeration evaporator section and forcibly circulates cold air to the refrigeration compartment through the refrigeration evaporator section; A refrigerator-freezer for an automobile, comprising a cold air passageway formed below the refrigerator compartment, both evaporator sections, and the blower, and through which the cold air flows.