JPS6056645A - Refrigerator for car - Google Patents

Abstract

PURPOSE:To permit preservation of coldness even on parking by installing a cooling plate covering the inside of a refrigerator case onto a heat accumulator installed inside the refrigerator case, so that heat conduction is permitted. CONSTITUTION:The case 4 of a refrigerator 1 is molded by the heat-insulating resin and equipped with a freely opened cover 4a. A heat accumulator 5 is made of the metal having a high thermal conductivity and equipped with an evaporator 7 inside. A cooling plate 6 for covering the inside of the case 4 of the refrigerator 1 is joined onto the heat accumulator 5 so that heat conduction is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle refrigerator that can keep the interior cool even when the refrigerator is parked.

[Prior art]

Conventional vehicular refrigerators have generally been proposed that utilize cold air from an air conditioner or that use an auxiliary evaporator connected to the refrigerating/recycling system of the air conditioner.

However, these devices can only cool the inside of the refrigerator while the air conditioner powered by the vehicle's engine is running, so if the vehicle is parked in the hot summer sun, There is a problem where the temperature inside the refrigerator rises in a short time after parking.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a refrigerator for a vehicle that can keep the inside of the refrigerator cool at a low temperature for a long period of time even when the vehicle is parked under the scorching sun.

〔Example〕

The present invention will be described below with reference to illustrated embodiments. FIG. 1 partially shows the interior of an automobile, and according to the present invention, a vehicle refrigerator 1 is installed in a space in front of a transmission lever 2, and a bracket (not shown) extends from directly below an instrument panel 3 to the back. It is attached to the vehicle body. A case 4 of the refrigerator 1 is made of a heat insulating resin, and a lid 4a is opened and closed to take in and out objects to be cooled, such as canned juice. Inside the case 4, a regenerator 5 and a cooling plate 6 are attached as described later.

As shown in Figs. 2, 3, and 4, the regenerator 5 is made of a metal with good thermal conductivity, such as aluminum, which is cold-cast into a flat shape, and has water as a regenerator inside. When the evaporator 7 is sealed, an evaporator 7 is installed. This evaporator 7 is made of, for example, an aluminum pipe with an outer diameter of 12.711 Il processed into a meandering shape as shown in FIG.

After storing the evaporator 7 in the regenerator 5, an aluminum top cover 5b is fixed to the upper end 11 part 5a of the regenerator 5 with screws 30.31 as shown in FIG.
The joint with A and the through hole of the 1'-1 side of the evaporator 7 and the exit I side pipe are sealed with a silicone seal (1).The cooling plate 6 is made of aluminum 2 etc. As shown in Fig. 3, metal with good thermal conductivity is pressed into a U-shape so that when the cooling plate 6 is stored inside the case, it covers the top and both sides of the inside of the case 4. This cooling plate 6 is fixed to the regenerator 5 by spot welding at several places so that it can conduct heat.Regenerator 51; As shown in FIG. Case 4 where the mounting plates 5c and 5d are shown in FIG.
It is fixed by screwing it to the upper end 4b of. The upper end 4b of the case has an inlet side 7a and an outlet side 7 of the evaporator 7.
A recess (not shown) is provided in the portion where b is disposed, and the upper end portion 4b of the case is fixed to the main body of the case 4 with screws. Further, a lid 4a is connected to the upper end portion 4b of the case via a hinge 40, and has a structure that is largely open upward.

FIG. 5 shows a refrigeration cycle, and 15 is a compressor for compressing and discharging refrigerant, and is operated by receiving driving force from a vehicle engine (not shown) via an electromagnetic clutch L5a. 16 is the height discharged from this compressor 15! A condenser 17 condenses high-pressure refrigerant; a receiver 17 receives the refrigerant condensed in the condenser 16 and discharges only liquid refrigerant; 18 is a first pressure reducing device that decompresses and expands the liquid refrigerant into a low-temperature, low-pressure mist, and 19 is an evaporator for cooling the vehicle. Here, the first pressure reducing device 18 is composed of a temperature-operated automatic expansion valve that can vary the amount of throttle depending on the pressure signal from the sensing cylinder 18a disposed on the outlet side piping of the cooling evaporator 19. The degree of superheat of the refrigerant at the outlet of the evaporator 19 is kept constant.

The cooling evaporator 19 is integrated with a heating heater unit disposed in the vehicle interior, for example, in the central lower part of the Φ-ilt device panel. Then, air from inside the vehicle interior or outside the vehicle interior is sucked in by the cooling fan 20, and after the intake cavity is cooled by the evaporator 19, it is blown out to the occupants from the air outlets provided at the center and left and right sides of the vehicle interior 1111 surface. It has become. These compressor 15, condensing z: (16, liquid receiver 17, expansion valve 1
8. Evaporation 'a: + No. 19 J refrigerant pipe 21 is connected in sequence to form a closed circuit to form a refrigeration cycle.

22 is a thermistor that senses the temperature of the cold air that has passed through the cooling evaporator 19, and is connected to the control circuit 23. The control circuit 23 detects that the temperature of the cold air detected by the thermistor 23 is too low and that frost forms on the surface of the cooling evaporator 19 (=1 <
When there is a danger, the power supply from the power supply 24 to the electromagnetic port 15a is stopped.

Reference numeral 25 denotes a refrigerant pipe for refrigeration installed to bypass the expansion valve 18 and the evaporator 19 for cooling.
, check valves 9 are sequentially arranged. That is, a constant pressure expansion valve 8 and a check valve 9 are connected to the evaporator 70 side pipe 7a and outlet side pipe 7b, respectively, shown in FIG.

The constant pressure expansion valve 7 is a type of expansion valve that opens when the pressure on the low pressure side becomes less than a set value and can control the low pressure side to a constant pressure. In this embodiment, R-12 is used as the refrigerant, and the constant pressure expansion valve The set pressure of No. 8 is selected to be 0.5 km/ct G (evaporation temperature -20°C).

26 is a control valve for blocking or reducing the flow of refrigerant to the expansion valve 18 and the cooling evaporator 19, and by restricting the flow of refrigerant to the expansion valve 18,
5 is provided to allow the flow of refrigerant into the interior. Any suitable control valve 26 can be used, but in this embodiment, it can be moved to two positions, an open position and a closed position.
Equipped with a magnetic opening/closing valve. 28 is an electromagnetic on-off valve 26
It is a control circuit that controls the timer circuit and has a built-in timer circuit.
- Send a signal to close the on-off valve 26 at regular intervals. 27 is a cooler switch f-1 that starts and stops the operation of the air conditioner by intermittent energization of the electromagnetic clutch 15a;
The L cold storage switch 1o is a switch for starting, stopping, and controlling the operation of the refrigerator by intermittent energization of the opening/closing valve 126. Control circuit 2: (cold)1. When the X switch 10 is turned on and the on-off valve 2G is closed, the thermistor 2
Relationship 4 (<This is a circuit that energizes the electromagnetic clutch 15a.

Next, the operation of the above configuration will be explained. -1. When it is desired to cool the interior of the vehicle during the summer, etc., the couch switch 27 is turned on to energize the electromagnetic clutch 15g1, thereby transmitting the rotational force of the engine to the compressor 15. This allows the compressor 15
is activated, the refrigerant discharged from the compressor 15 circulates in the pipe 21, and when the refrigerant evaporates in the cooling evaporator 19, it absorbs the heat of vaporization from the air, and the air that has been cooled by the heat of vaporization is removed. The air is blown into the vehicle interior by the cooling fan 20. At this time, the evaporation pressure in the evaporator 19 is 2 to 3 kg/ca, and the evaporation pressure is 2 to 3 kg/ca.

Since the pressure is approximately the same as the pressure flowing to the compressor side end of the refrigerant pipe 25 for refrigeration, the constant pressure expansion valve 8 remains closed and there is no flow of refrigerant within the refrigerant pipe 25.

Next, when the refrigerator is to be operated in this cooling operation state, the refrigerator switch 10 is turned on. Control circuit 2
In response to the timer signal No. 8, the on-off valve 26 is first energized for a first set time, for example, 15 seconds. When the on-off valve 26 is energized and closed, the flow of refrigerant to the cooling evaporator 19 is stopped, and the suction pressure of the compressor 15 drops rapidly.
Reach 0.5 kg/ctAG in 3-4 seconds. Therefore, the constant pressure expansion valve 8 of the refrigerant circuit 25 for refrigeration opens and the refrigerant begins to flow through the refrigerant circuit 25. At this time, as described above, the constant pressure expansion valve 8 sets the low pressure side pressure to the set pressure (0,5
kg/ca G), the inside of the refrigerating evaporator 7 is 0.5 kg/cn! G, the temperature reaches 20°C, and the water in the regenerator 5 is made into ice. Then, when the set time (15 seconds) has elapsed, the control circuit 28 stops energizing the on-off valve 2G.\, so the on-off valve 26 returns to the open position. When the on-off valve 26 opens, the refrigerant is again supplied to the cooling evaporator 19, and the pressure inside the evaporator 19 and the pressure on the suction side of the compressor return to 2 to 3 kg/cmG. This pressure is the pressure inside the refrigerating evaporator 7 (0,5
kg/caG), but since the check valve 9 is installed downstream of the refrigerator evaporator 7, the refrigerant gas that has passed through the cooling evaporator 19 will not flow back into the refrigerator evaporator 7. Therefore, the pressure inside the evaporator 7 is not suddenly increased. On the other hand, the constant pressure expansion valve 8 automatically closes when the low-pressure side pressure becomes higher than the submerged pressure of 0.5 kg/cffl G, thereby stopping the supply of refrigerant. Thereafter, the evaporator 7 continues to make ice while the liquid refrigerant therein gradually evaporates. This state continues for a second set time (for example, 60 seconds) determined by the control circuit 28. Thereafter, the on-off valve 2 is operated according to the set time by the timer signal from the control circuit 28.
The opening and closing of 6 is repeated.

Although the refrigerant does not flow to the cooling side evaporator 19 for 15 seconds while the refrigerant flows to the refrigerator evaporator 7, the blowout temperature does not rise suddenly due to the heat capacity of the evaporator 19 (the electromagnetic clutch 15a The fluctuation is smaller than when the air temperature of the air-conditioning evaporator 19 is controlled by intermittent operation of Can make ice.

Here, according to this example, W? Since the cooler 5 and the cooling plate 6 are made of a metal with good thermal conductivity (aluminum in this example) and are bonded to each other by spot welding or the like to allow heat conduction, the surface temperature of the regenerator 5 frozen inside as described above also decreases to O. ``Less than CC,
The surface temperature of the cooling plate 6 also becomes 0° C. or lower due to heat conduction. Therefore, the inside of the refrigerator is surrounded and cooled from four sides: the surface of the regenerator 5, the top surface of the cooling plate 6, and both sides, so the temperature distribution inside the refrigerator is more uniform than when there is no cooling plate 6. , the cooling effect of lowering the internal temperature is greatly improved. Moreover, since the cooling plate 6 is provided, heat that enters from outside the refrigerator 1 is absorbed by the cooling plate 6, thereby increasing the cold insulation effect inside the refrigerator 1. In this way, the cooling plate 6 is
It has the function of cooling the inside and the function of absorbing heat entering from the outside.

The present invention is not limited to the one embodiment described above, but can be implemented in a wide variety of ways, and modified examples of the present invention will be listed below.

(1) The installation position of the refrigerator 1 is not limited to the front of the converter 3 & machine lever 2, but can be installed anywhere where the refrigerant piping can be heated from the vehicle cooling system. It may be placed in the trunk room of No. 11 or the like.

(2) In addition to the tires, the on-off valve 26 may also be controlled by detecting the degree of cooling of the evaporator 7 (by increasing the length of time when the on-off valve 26 is closed, or by continuously closing the on-off valve 26). Manual quenching switch
7chi is the set number).

(3) In the above-mentioned cooling, the refrigerant is cooling + 1111 evaporation 2
The check valve 9 is used as a valve mechanism for closing the refrigerant pipe 25 of the refrigerator so that the refrigerant that has passed through the evaporator 19 when flowing to the refrigerator evaporator 7 does not flow back to the refrigerator evaporator 7. Instead of the solenoid valve, use an electromagnetic valve to open and close the solenoid valve 26.
The solenoid valve may be closed when the on-off valve 2G is opened in synchronization with the above.

(4) The opening/closing valve 26 was described as being able to completely block the flow of refrigerant to the expansion valve 18 when in the closed position. Good too. However, the flow rate at this time must be such that the suction pressure of the compressor can be kept at 0.5 kg/0111 G or less.

(5) The mounting position of the on-off valve 26 is not limited to the illustrated position, and may be installed at any position on the cooling refrigerant pipe that is parallel to the refrigerant pipe 25 for refrigeration.

(6) In the above-mentioned embodiment, the frost prevention control of the cooling side cycle was performed by intermittent control of the electromagnetic clutch 15a by the thermistor 22, but the frost prevention control of the cycle is not limited to this example. On the downstream side of the evaporator 19, there is a confluence of the refrigerant pipes 25 for refrigeration.
An evaporation pressure adjustment device is disposed in the second stream, and the evaporation pressure of the cooling evaporator 19 is controlled by this evaporation pressure adjustment device, thereby achieving cycle floss! - Preventive control may be performed.

(7) The regenerator 5 may be made of stainless steel or the like instead of aluminum UNO, and the evaporator 7 may also be made of a flat tube instead of a nine tube. In addition, as a cold storage material, there are many kinds of materials that can be used, such as one in which the freezing point is lowered by mixing appropriate Moon 1'-1 with water, and one that utilizes sol, gel, and phase change.

(8) Three-dimensional network 3 of metal fibers formed of stainless steel or the like as shown in figure ff16 around the evaporator 7 in the regenerator 4
2 may be inserted to shorten the ice making time.

(9) In place of the constant pressure expansion valve 8 in the refrigeration cycle shown in FIG. It may be closed when opened. Further, in this case, the solenoid valve and the on-off valve 26 can be replaced with one three-way switching solenoid valve.

(10) The control circuits 23 and 28 can also be integrated by a control device using a microcomputer.

(11) The surface on which the cooling plate 6 is provided is not limited to the above example, and may be provided so as to cover the front and bottom surfaces of the inside of the refrigerator 1.

〔Effect of the invention〕

As described above, in the present invention, the refrigeration cycle of the vehicle cooling system is used to cool the cold storage material of the cold storage device, so the cold storage can be completed in a relatively short time by using the capacity of the cooling system. Therefore, even if the vehicle is subsequently parked in the hot sun, the interior of the refrigerator can be kept cool at a low temperature of, for example, about 10° C. until evening, which is very effective.

In addition, since the cooling plate that covers the inside of the refrigerator is connected to the regenerator, the inside of the refrigerator is cooled not only by the regenerator but also by the cooling plate, and the cooling plate absorbs heat that enters from outside the refrigerator. , excellent cold insulation effect can be obtained.

[Brief explanation of the drawing]

The drawings all show embodiments of the invention, and Fig. 1 is a partial perspective view of the interior of a heavy vehicle compartment equipped with the refrigerator of the invention;
Fig. 2 is a front view of the regenerator, Fig. 3 is a perspective view of the regenerator and cooling plate, Fig. 4 is a sectional view of the refrigerator of the present invention, Fig. 5 is a refrigeration cycle diagram including the refrigerator of the present invention, and Fig. 6 7 is a sectional view of a main part showing another embodiment of the regenerator, and FIG. 7 is a side view of the regenerator and the cooling plate. 1...Refrigerator, 4...Refrigerator case, 5...Neck cooling 2: (, 6...Cooling plate. Patent attorney Okabe) Figure 1 Figure 4 b Figure 5 Figure 6 Figure 7 Procedural amendment 1 Display of the case 1982 Patent Application No. 165705 2 Name of the invention Vehicle refrigerator 3 Person making the amendment Relationship to the case Patent applicant Aikatsu Tori 1-1 Showa-cho, Biriya City (426) Nippon Denso Co., Ltd. Representative To + 1J Kengo 4th generation Masato 〒448 1-1 Showa-cho, Aichishoori-shi, 5-5 Column for detailed description of the invention of the invention in the subject specification of the amendment and drawings. 6 , ?ili Correct contents (1) "Use..." on page 3, line 7 of the specification.
First, insert the following sentence between and "Regenerator 5". "The upper ends 5c and 5d of the regenerator 5 are bent and formed as shown in FIG. 3, and holes 5e for screws are bored." (2) In r5a of page 3, line 9 of the same book, ” and “In Figure 7...”, 1111 people will write “Figure 2 and”. (3) Delete "Regenerator 5 is...fixed" from page 3, line 19 of the same book to page 4, line 3 of the same book. (4) Figures 2, 3 and 7 of the drawings will be corrected as shown in the attached sheet.

Claims (1)

[Claims] Cold storage is carried out using a refrigerator case with an insulated structure, a door that can be opened and closed on this 7fi storage case, and a refrigeration system installed in the refrigerator case. A two-purpose refrigerator comprising: a regenerator for cooling materials; and a cooling plate that is attached to the regenerator in a heat conductive manner and provided inside the refrigerator case so as to cover the inner surface of the refrigerator case. .