JP2007112271A - Cold storage pack and cold storage type cooling unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the air-conditioning ability by enhancing the heat-exchange efficiency of a cold storage pack used in this cold storage type cooling unit with the air. <P>SOLUTION: The cold storage pack 31 stores the cold upon cooling a cold storage material encapsulated in a cartridge 32 by a cold storage cooling coil coupled with a refrigerating cycle, in which a number of projections 33 are formed on the surface of the cartridge 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cold storage pack and a cold storage type cooling unit applied to an air conditioner with a cold storage device for a vehicle.

DESCRIPTION OF RELATED ART Conventionally, the air conditioner with a cool storage apparatus provided with the refrigerating cycle (refrigerant circuit) with a cool storage apparatus is known as an air conditioner for truck cabins, for example. The air conditioner includes a cooling coil for storing cold energy for storing cold energy while the vehicle is running so that the cabin can be cooled with the engine stopped, for example, when the driver takes a nap.
The cooling coil for cold storage is installed in parallel with the air conditioning evaporator used for air conditioning in the cabin during traveling of the vehicle in which the engine is driven during the refrigeration cycle, and alternately supplies refrigerant from the compressor driven by the engine. Receiving and cooling the regenerator material.

  The cold storage cooling coil described above is installed, for example, in a cold storage type cooling unit attached to a window frame behind the cabin. The regenerator type cooling unit is a regenerator in which a regenerator cooling coil connected to a refrigeration cycle and a regenerator material such as water that is cooled and frozen by the regenerator cooling coil are sealed in a casing provided with a suction port and an outlet. A pack and a fan for sucking the air in the cabin into the casing and blowing out the cool air are provided. That is, the cool storage type cooling unit sucks air in the cabin from the suction port by the operation of the fan, and blows out this air into the cabin from the outlet as cold air cooled by the cold heat of the cool storage pack. Is made possible.

In such a regenerative cooling unit, in order to suppress the size of the unit itself and to ensure the cooling capacity and the cooling time, it is necessary to efficiently and effectively use the cold stored in the cold storage pack.
For this reason, in the cool storage type cooling device in which the cool storage evaporator is disposed in the case, and the cool storage pack is closely disposed on the tube surface of the evaporator, a plurality of rib members are provided inside the case for air guidance. It has been proposed. Since the rib members are arranged in a staggered manner in order to uniformly disperse the air flow that flows in from the suction port and travels toward the cool storage pack, it is assumed that the blown air can be efficiently cooled in the entire region of the cool storage pack. (For example, see Patent Document 1)
JP-A-8-216670 (see FIGS. 3 and 4)

By the way, as a countermeasure for environmental problems in recent years, idling operation at the time of parking is prohibited. For this reason, the cooling operation by the regenerative cooling unit is not only used in a time zone with a small heat load, such as a nap for about 2 to 3 hours at night or at dawn, but also during a break in the daytime when the heat load is large However, there is an increasing demand for using it for a relatively short time (about 30 minutes to 1 hour).
However, since the rib member described in Patent Document 1 described above is installed on the inner surface of the case, the rib member itself has a function of guiding the air flow, but the temperature of the rib member itself is not as low as that of the cold storage pack. Therefore, the rib member does not have a cooling function like a cold storage pack, and there is a problem that heat exchange efficiency under a large heat load cannot be ensured unless the size of the cold storage pack is changed.

Against this background, regenerative cooling is used to improve the efficiency of heat exchange between the regenerator pack and air without changing the size of the regenerator pack, and to blow out cool air that is comfortable even under high heat load conditions. It is desirable to increase the air conditioning (cooling) capacity of the unit.
The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a cold storage pack and a cold storage type cooling unit that can improve the heat exchange efficiency between the cold storage pack and the air and increase the air conditioning capability. Is to provide.

In order to solve the above problems, the present invention employs the following means.
The cold storage pack according to the present invention has a plurality of protrusions formed on the surface of the cartridge in the cold storage pack in which the cold storage material sealed in the cartridge is cooled by a cold storage cooling coil connected to the refrigeration cycle to store the cold heat. It is characterized by.

  According to such a cold storage pack, since a large number of protrusions are formed on the surface of the cartridge, the heat storage efficiency can be improved by increasing the surface area where the cold storage pack comes into contact with air.

  In the cold storage pack described above, it is preferable that the thickness of the protrusion is set to be thinner than the wall surface of the cartridge. This improves the heat exchange efficiency in the protrusion portion, so that the heat exchange efficiency of the entire cold storage pack is further increased. improves.

  A regenerative cooling unit according to the present invention is a regenerative cooling unit of an air conditioner with a regenerator, and includes a regenerative cooling coil connected in parallel with an air conditioning evaporator during a refrigeration cycle, and includes an air inlet and a cool air The cooling coil for cold storage, the cold storage pack according to claim 1, and a fan that sucks and blows air are provided in a casing provided with an air outlet. is there.

  According to such a cold storage type cooling unit, since the cold storage pack according to claim 1 or 2 is provided, the surface area where the cold storage pack comes into contact with air is increased by a large number of protrusions, and the heat exchange efficiency of the cold storage pack is improved. Unit. Further, if the protrusion is thin, the heat exchange efficiency in the protrusion portion is improved, so that the heat exchange efficiency of the entire cold storage pack is further improved.

  According to the present invention described above, since a large number of protrusions are formed on the surface of the cartridge to increase the surface area where the cold storage pack contacts the air, the heat exchange efficiency can be improved without changing the size of the cold storage pack. . Therefore, the regenerative cooling unit that employs this regenerative pack can blow out a comfortable cold air even in a use condition with a high heat load, and can obtain a remarkable effect that the cooling capacity is improved.

Hereinafter, one embodiment of a cool storage pack and a cool storage type cooling unit concerning the present invention is described based on a drawing.
The refrigerant circuit diagram shown in FIG. 8 is mainly applied to a vehicle air conditioner, and is adopted, for example, in an air conditioner with a cool storage device installed in a vehicle such as a truck. In FIG. 8, 1 is a compressor, 2 is a condenser, 3 is a receiver, 4 is an air conditioning evaporator, 5 is a temperature type expansion valve (hereinafter also referred to as “air conditioning expansion valve”), and 7 is provided. Is an air conditioning solenoid valve, 8 is a cooling coil for cold storage, 9 is a temperature type expansion valve (hereinafter also referred to as “cold storage expansion valve”), 11 is a cold storage electromagnetic valve, and 12 is a check valve. , 13 is a frost thermostat that operates by detecting the temperature of the air conditioning evaporator, and 14 is a control device for the entire apparatus.

In the air conditioner with a regenerator configured from the above-described elements, the air conditioning evaporator 4 and the regenerator cooling coil 8 arranged in parallel in the refrigerant circuit include the air conditioner solenoid valve 7 and the animal A cold solenoid valve 11 is provided. The control device 14 performs opening / closing control by alternately energizing the air conditioning electromagnetic valve 7 or the cold storage electromagnetic valve 11, and causes the refrigerant to flow alternately through the air conditioning evaporator 4 and the cold storage cooling coil 8. In this case, the operation time of the air conditioning evaporator 4 and the operation time of the cold storage cooling coil 8 are set to be a predetermined time ratio, for example, and the control device 14 controls the air conditioning electromagnetic valve 7 and the cold storage electromagnetic wave based on this time ratio. The opening and closing of the valve 11 is controlled.
As an example of the operation time described above, for example, the air conditioning operation time for flowing the refrigerant to the air conditioning evaporator 4 is 45 seconds, and the cold storage operation time for flowing the refrigerant to the cold storage cooling coil 8 is 20 seconds.

As shown in FIGS. 4 and 5, the regenerative cooling unit 20 including the regenerative cooling coil 8 is used, for example, for cooling a nap room installed in the cabin of a truck and provided behind the driver's seat. . In the illustrated example, in place of the window glass provided on the wall surface behind the cabin, a regenerative cooling unit 20 is installed upright in the vertical (vertical) direction.
The regenerator type cooling unit 20 includes a regenerator unit 30 and a fan 40 in a casing 23 provided with an air inlet 21 and a cold air outlet 22. The cold storage unit 30 seals the cold storage cooling coil 8 connected to the above-described refrigeration cycle (refrigerant circuit) for vehicle air conditioning and the cold storage material such as water cooled by the cold storage cooling coil 8 in a pack case. The cold storage pack 31 is provided, and the cooling coil 8 for cold storage and the internal case 50 for storing the cold storage pack 31 are provided. The cold storage unit 30 has a configuration in which both sides of a flat extruded tube 8 a constituting the cold storage cooling coil 8 are sandwiched by cold storage packs 31 from both sides. The regenerative cooling coil 8 has a configuration in which a pair of left and right headers are connected by a plurality of flat extruded tubes 8a, and each of the flat extruded tubes 8a is provided with a number of refrigerant flow paths (not shown).

The fan 40 has a function of sucking in air to be cooled from the cabin into the casing 23 and blowing out cool air cooled by heat exchange with the cold storage pack 31 when passing through the casing 23.
The casing 23 is divided into a front panel 23F exposed facing forward in the cabin, and a rear panel 23R attached to the window glass opening 16 of the panel member 15 forming the cabin rear wall surface.

The rear panel 23R is fixedly supported on the rear wall surface of the cabin with the periphery sandwiched by the wind dam 17 instead of the window glass. The rear panel 23R is fixedly supported by the cold storage unit 30 described above, and a front panel 23F is attached so as to cover the front surface of the cold storage unit 30. The front panel 23F is detachably fixed to the rear panel 23R using bolts or the like that penetrate the cold storage unit 30, and in this fixed state, a gap 24 in the front-rear direction is provided between the front panel 23F and the rear panel 23R. Is provided over the entire circumference.
That is, in the regenerator type cooling unit 20, the refrigerant supplied to the regenerator cooling coil 8 and the regenerator cooler coil 8 receiving the supply of refrigerant from the refrigerant circuit in the casing 23 provided with the suction port 21 and the outlet 22 absorbs heat. The cool storage pack 31 that is cooled and then housed in the inner case 50 and the fan 40 that forms the flow of air are provided.

On the front surface of the front panel 23F, a suction port 21 that penetrates a panel material such as resin to the back surface is disposed at the center of the lower portion. Similarly, a pair of left and right outlets 22 and 22 that penetrate the panel material to the back surface are provided in the upper portion. It is arranged near both left and right ends. The pair of left and right outlets 22, 22 are arranged symmetrically with respect to the suction port 21 at the center of the lower part.
Further, a fan 40 is installed in the upper part of each of the air outlets 22, 22, and the air in the cabin is sucked from the air inlet 21, and the cool air blown through the air passages and grooves described later is blown out. It blows out into the cabin from the outlets 22 and 22. The fan 40 is fixed to the upper part of the back surface of the front panel 23F.

The inner case 50 is a molded part such as a resin, and in particular, it is preferable to employ a material having high heat insulation performance to enhance heat insulation.
The inner case 50 forms an air flow path 60 between the front and rear surfaces of the cold storage pack 31 that sandwiches the flat extruded tube 8a, and has a suction opening 61 that communicates with the suction port 21 at the lower portion thereof. It is set as the structure which formed the blower opening (not shown) in the upper part so that it might each communicate with the blower outlet 22. FIG. The inner case 50 is fixedly supported to the rear panel 23R by bolts or the like not shown as a cold storage unit 30 integrated with the cold storage cooling coil 8 and the cold storage pack 31 housed inside.
By providing such an internal case 50, the heat insulation performance of the cold storage unit 30 is increased and intrusion heat is prevented, so that the cold storage pack 31 and the cold storage cooling coil 8 are not easily affected by intrusion heat from the outside. In addition, the code | symbol 51 in a figure is a drain pan for collecting and draining the dew condensation water (drain water) which falls below the cooling coil 8 for cool storage and the cool storage pack 31. FIG.

The cool storage pack 31 used in the above-described cool storage type cooling unit 20 is configured such that a cool storage material is sealed in a cartridge 32 of a resin molded product having a substantially hollow plate shape. As shown in FIGS. 1 and 2, the cold storage pack 31 has a large number of protrusions 33 formed on the surface 32 a of the cartridge 32. As shown in FIG. 3, the protrusion 32 is preferably set to be thinner than the wall surface forming the surface 32 a of the cartridge 31.
As described above, when a large number of protrusions 33 are provided on the cartridge 32 of the regenerator pack 31, the surface area in contact with the air flowing along the regenerator pack 31 increases, so that the regenerator pack 31 cools by cooling to air. Efficiency can be improved. Further, by setting the thickness of the projection 33 to be thin, the heat exchange efficiency for cooling by cooling to the air flowing around the projection portion is improved as the resin thickness is reduced.

  For example, as shown in FIG. 6, the above-described cold storage pack 31 is arranged such that the tip of the protrusion 33 contacts the inner surface of the inner case 50, and the air flow path 60 formed between the inner case 35 and the cold storage pack 31. A large number of protrusions 33 protrude in a staggered pattern. 6A shows a configuration example in which both sides of the flat extruded tube 8a are sandwiched between the cold storage packs 31 and stored in the inner case 50, and FIG. 6B shows the both sides of the flat extruded tube 8a in the cold storage pack. 2 shows a configuration example in which two sets sandwiched by 31 are prepared and stored in the inner case 50 in a state in which the protrusions 33 are in contact with each other.

For this reason, the air flowing through the air flow path 60 flows in contact with not only the surface 32a of the cold storage pack 31 but also the surfaces 33a of the numerous protrusions 33, and is thus cooled from both surfaces 31a and 33a. That is, since the ability to cool the air by increasing the surface area in contact with the air increases, a sufficient cooling ability can be obtained even in a situation where the heat load is high, such as during daytime parking, without increasing the size of the cold storage pack 31. The cooling capacity of the cooling unit 20 can be increased and a comfortable cold air can be blown out.
Moreover, as shown in FIG. 7, the protrusion 33 may be provided also in the surface 33b of the cold storage pack 31 which contacts the flat extrusion tube 8a, and if this structure is used, the contact area with air will further increase. The cooling capacity of the regenerative cooling unit 20 is further improved.

As described above, according to the present invention, a large number of protrusions 33 are formed on the surface 32a of the cartridge 32 to increase the surface area where the cold storage pack 31 comes into contact with air, so heat can be generated without changing the size of the cold storage pack 31. Exchange efficiency can be improved. Therefore, the cool storage type cooling unit 20 adopting the cool storage pack 31 can blow out comfortable cool air even in a use condition with a high heat load, and the cooling capacity is improved.
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

It is a front view which shows one Embodiment of the cool storage pack which concerns on this invention. It is a side view of the cool storage pack shown in FIG. It is AA sectional drawing of FIG. It is a side view which shows the example of a state in which the cool storage type cooling unit which concerns on this invention was installed in the cabin. FIG. 5 is a front view of FIG. 4. It is sectional drawing which shows the structural example of a cool storage unit, (a) is the structural example which pinched | interposed the flat extrusion tube with the cold storage pack, and accommodated in the inner case, (b) is the flat extrusion tube and cold storage pack of (a). It is the structural example accommodated in the inner case combining two. It is sectional drawing which shows the structural example of the cold storage unit using the cold storage pack which provided the protrusion on both sides, (a) is the structural example which pinched | interposed the flat extrusion tube with the cold storage pack, and accommodated in the inner case, (b) It is the structural example which combined two flat extrusion tubes and cold storage packs of (a), and accommodated in the inner case. It is a refrigerant circuit diagram of the air conditioner with a cool storage device applied to the vehicle air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Capacitor 4 Evaporator for air conditioning 5,9 Expansion valve 7 Air conditioning solenoid valve 8 Cooling coil for cool storage 8a Flat extrusion tube 11 Cool storage solenoid valve 14 Controller 20 Cool storage type cooling unit 21 Suction port 22 Outlet 23 Casing 23F Front panel 23R Rear panel 30 Cold storage unit 31 Cold storage pack 32 Cartridge 32a Surface 33 Projection 33a Surface 40 Fan 50 Inner case 60 Air flow path

Claims (3)

In the cold storage pack for storing the cold energy by cooling the cold storage material sealed in the cartridge by the cooling coil for cold storage connected to the refrigeration cycle,
A cold storage pack, wherein a plurality of protrusions are formed on the surface of the cartridge.   The cold storage pack according to claim 1, wherein a thickness of the protrusion is set to be thinner than a wall surface of the cartridge. A regenerative cooling unit for an air conditioner with a regenerator,
The cooling coil for cold storage provided in the casing provided with the cooling coil for cold storage connected in parallel with the evaporator for air-conditioning in the refrigerating cycle, and provided with the inlet of air, and the blower outlet of cold air, The claim 1 or 2 A regenerative cooling unit, and a fan that sucks and blows air.

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