CN101424471A

CN101424471A - Cooling plant

Info

Publication number: CN101424471A
Application number: CNA200810175145XA
Authority: CN
Inventors: G·布莱沃; S·布莱沃
Original assignee: Bravo SpA
Current assignee: Bravo SpA
Priority date: 2007-10-31
Filing date: 2008-10-30
Publication date: 2009-05-06
Anticipated expiration: 2028-10-30
Also published as: ITMI20072106A1; EP2055212A1; CN101424471B

Abstract

Cooling plant with a vertical showcase comprising a box-shaped body (10) inside which, in a display portion (14), there is a varying number of grids or shelves (12) for the housing of products to be maintained at a controlled temperature. A cooling group (13) comprises a compressor (17) suitable for compressing the cooling gas, an air condenser (21) and at least one fan (20) suitable for subtracting heat from the compressed gas and supplying said gas, through a cooling circuit, to an evaporation group (15) which expands said gas cooling it and subtracting heat from the products housed in said display portion.

Description

Cooling device

Technical field

The present invention relates to a kind of cooling device.More specifically, the present invention relates to a kind of cooling device that is used for vertical showcase, this cooling device is optimized, thereby has high cooling and defrosting performance.

Background technology

So-called " vertical showcase " cooling device adopts the cabinet of being made by four full glass walls to constitute usually; One in four walls is made of one or more door usually, and this door is preferably made by glass.In this cabinet, there be the glass screen work or the shelf of variable number.

Cooling or freezing group usually (but unessential) are positioned at the bottom of showcase, partly separate or isolate with the glass display.

The cooling group has piston compressor usually, and this compressor produces sizable noise, and realizes the expansion of gas by means of capillary, and this has brought a lot of shortcomings thereupon.The whole service time of expanding for compressor by gas capillaceous all is constant, this is known, this door at showcase is opened and closed when taking out product continuously or is inappropriate after the defrosting stage, in the above-mentioned time, temperature rises, thereby refrigeration work consumption must be increased, so that the temperature in the showcase is got back to the value that is suitable for preserving product as early as possible.

In the cooling device of known type, the aerial condenser with fan of fixed speed is fitted together with compressor bank.

This scheme is proved to be same instability, and it is outdoor to consider that this showcase can be exposed on, and therefore can be subjected to possible climate change, and therefore, fixing ventilation can produce condensate more or less, can cause cooling performance unusual, difference simultaneously.These devices also comprise evaporator bank, and this evaporator bank must be carried out low-temp radiating, and can be positioned in bottom or top in the showcase, perhaps are separated to be used for each shelf-screen work.

The cooling device of vertical showcase is divided into so-called static cooling device and ventilation cooling device usually.

The element that static cooling device is defined as low-temp radiating is not to be dipped in the forced ventilation stream but situation about spreading by common cross-ventilation.Static cooling device has the evaporimeter that is positioned at each screen work layer below of various very thin (for example about 10-15mm) usually.

As time goes by, from below the screen work that flows down of humid air can be coated by ice and can lose their cooling effect.Therefore, showcase must weekly or be cleared very continually under user's judgement and cooling device is de-energized, thereby melt the ice, and when finishing defrosting, showcase inside must be cleaned and is dry, and cooling device is energized, and must wait for reaching storage temperature up to, put into the product that will display then, to be used for sale.

The ventilation cooling device has the evaporimeter that is arranged in showcase top or bottom.The ventilation cooling device uses the air stream that is produced by fan, and this fan sucks air from vaporizer side, makes air pass through the aluminium fin that very intensive series of thin is also passed through in the copper pipe loop.

In this stage, air has lost its humidity, is further cooled, and is blown into then in the internal environment of showcase, to reduce its temperature.

Air in the showcase is inhaled in the evaporimeter simultaneously, produces continuous cooling circuit.

Because the ice that during humid air passes through, forms, the evaporimeter of these types is also blocked, therefore, these evaporimeters also need defrosting, the electromic thermostat that this defrosting drives by means of the time usually, this electromic thermostat cut off cooling device and start the lip-deep resistance that is applied to a series of fins.

Can in same cooling device, adopt the frost melting element of the gas of heat, to replace resistance as evaporimeter.

In this case, needn't in showcase, take out product, but because inhomogeneous to the heating of the evaporimeter on the resistance component, need some times to melt all ice, and owing to only adopt the gas of heat, the temperature in the showcase rises thereupon, and product can go bad.

The purpose of this invention is to provide a kind of cooling device that can overcome above-mentioned defective, this device will be used for the highly efficient cooling device of showcase and combine with supper-fast defrosting system equally efficiently, be used to clean the ice coating that forms on evaporimeter in its normal cooling period.

Therefore, purpose of the present invention is with relevant according to the cooling device of claims 1.

Description of drawings

From below with reference to the exemplary and non restrictive description of accompanying drawing to embodiment, will become more obvious according to the feature and advantage of cooling device of the present invention, wherein:

Fig. 1 is the stereogram that is used for the cooling device of vertical showcase;

Fig. 2 shows the cooling circuit of the cooling device of Fig. 1 during cooling stage;

Fig. 3 shows the cooling circuit of gas of the cooling device band heat of Fig. 1 during the defrosting stage;

Fig. 4 a and 4b show the amplification details that evaporator bank according to the present invention is seen from the top and seen from the side.

The specific embodiment

With reference to above-mentioned accompanying drawing, cooling device of the present invention comprises cabinet or box-shaped body 10, and this main body adopts preferred four walls being made by glass fully to constitute; One in described four walls is made of one or more door 11 usually, and this door is also preferably made by glass.The screen work of variable number or shelf are usually located in this cabinet, are used to hold the product that will be maintained at controlled temperature; These shelves are preferably made by glass.

Cooling or freezing group 13 usually (but not being essential) are positioned at the bottom of showcase, and this cooling or freezing group 13 are displayed part 14 with glass to be separated and isolate, and evaporator bank 15 is usually located at the top of showcase or cabinet.

The cooling group is applicable to the temperature and pressure that improves refrigerating gas, and makes this refrigerating gas liquefaction then and draw heat from this refrigerating gas.This gas is suitably offered evaporator bank, wherein, the pressure differential by means of existing in the liquid suction side is injected into evaporimeter, in this evaporimeter, expand and become gaseous state, thereby the product of storing in the cooling device on various shelves absorbs heat.Then, gas is sent back to the cooling group, is used for new circulation.

Evaporator bank and cooling group are cooling circuit by means of two loops that separate and are interconnected by the defrosting loop that thermoregulator drives.

Described cooling group comprises for example blade-carrying revolution type compressor 17, and this compressor has high cooling efficiency and noise is lower.

Described compressor 17 is sent to refrigerating gas from its outlet conduit 171 evaporation and condensate tank(trap) 18 and makes it to enter condenser 21 subsequently, and in this condenser, under the effect of the fan 20 of two motors drivings, gas is converted to liquid state from gaseous state.

In the exit of condenser 21, there is a temperature sensor 22, this temperature sensor is applicable to the temperature of indication gas and sends signal to the speed regulator 19 of fan; According to predefined temperature, adjuster increases or reduces the speed of the fan 20 that motor drives, and contributes thereby the temperature of the liquefied gas that will leave condenser 21 is remained constant.

Adopt this mode, if the outer environment temperature of showcase is a bit high, the fan 20 that motor drives will also rotate sooner, remain constant with the temperature of the condensed gas that will leave condenser 21, thereby keep the performance of cooling device.Behind this condenser, liquid receiver 23, filter 24 and fluid passage indicator 25 are arranged in this loop.

Evaporator bank comprises by being used for the pipe 34 from the gas of cooling group, two fan 40 (purposes that are used for example, only show one) and the loop formed of exhaust outlet 42, described pipe 34 is arranged in the defrosting unit 37 that is arranged in housing 41, described two fans 40 are applicable to that the low temperature in the showroom that makes showcase 14 scatters, described exhaust outlet 42 is used for discharging condensate and condensate is sent to condensate feeder 18, and described condensate is a liquid of collecting the flash-pot group.

This evaporator bank also comprises a pair of defrosting

resistance

33 and 39, the closed pore warming plate 38 above evaporator bank 15, and this closed pore warming plate 38 is used for stoping in evaporator bank and originally forms ice and frost on one's body.

Cooling circuit comprises heat exchanger 26 and thermostatic valve 31 (for example MOP fills thermostatic valve), and by this thermostatic valve, gas is sent to evaporator bank 15 in suitable temperature.

Injecting gas when MOP fills thermostatic valve 31 and is limited in compressor 17 by starting, thus make the compressor can excess load, avoid occurring the problem of starting aspect.

Assemble described thermostatic valve 31 and replace traditional capillary diffuser, be opened with after taking out product and after defrosting at door, the inlet temperature of this thermostatic valve 31 and the air in evaporimeter 37 improves or reduces the temperature in gas expansion, the fast quick-recovery showcase relatively automatically.

Liquefied gas in evaporimeter 37 expands to remove heat and to turn back to gaseous state, and this gas leaves evaporimeter, enters into interchanger 26, turns back to compressor 17 through check valve 27 and by inlet duct 172, is used for new circulation.

The defrosting loop comprises magnetic valve 28, and this magnetic valve makes the gas of heat be sent to evaporator bank from compressor 17 by means of feeding pipe 29.

In this defrosting loop, before the refrigerating gas of heat is cooled in described condenser 21, from described compressor, remove this hot refrigerating gas, and by means of the described feeding pipe 29 by valve 28 controls that suitably driven, the refrigerating gas that this is hot is sent to described evaporator bank.

Described feeding pipe is separated in its end, so that described gas enters into evaporimeter 37, this evaporimeter 37 is himself being divided into two inlet 35-36, so that loop 34 is better presented, thus more efficient and defrosting and be melted in the ice that forms on the fin of evaporimeter 37 apace.This defrosting also obtains the support of

resistance

33 and 39,

resistance

33 and 39 and valve 28 start by thermoregulator together.

This defrosting adopt thermoregulator 45 simultaneously in two ways (adjustment of about 3 minutes (it can be modified) and by means of other adjustment of detector 32) control, this detector 32 interacts with thermoregulator 45, if leaving the gas of evaporimeter 37 reached before expeced time+2 ° ,+3 ° (this also can be modified), then can stop defrosting again.

In this defrosting stage, fan 20 is advantageously stopped, and in condenser 21, gas pressure increases, and this condenser 21 forces gas can only pass through feeding pipe 29 as " shut off valve "; This has been avoided further increase electric check valve.

The part of leaving evaporimeter 37 is cooled but the gas of the heat of be not condensed (not being liquefied) turns back to compressor 17, and in this compressor 17, gas is reheated and is pumped out to again in the feeding pipe 29, thereby proceeds the defrosting circulation.On described thermoregulator 45, be provided with defrosting cycle-index and duration.

In the alternative embodiment shown in Fig. 4 a and the 4b, adopt the single pipeline 46 of the upstream in the whole loop that is arranged in evaporimeter 37 to realize the gas of heat is injected into evaporimeter 37.

By means of plate 30, a resistance 39 in the resistance is held on the bottom of a series of fins that press against evaporimeter 37, and this plate 30 is processed to specific shape and tilts, to promote the discharging of condensed water.

When plate 30 was placed on the resistance 39, plate 30 was heated, and stoped the water freezing that drops on the plate 30, thereby promoted water to flow into exhaust outlet 42.

The housing of being made by aluminium sheet 41 covers whole evaporator bank 37 and makes this housing can further collect water, ice or the frost of loss, and water, ice or frost are directed to exhaust outlet 42.

Second resistance 33 is positioned and is crushed on the inner surface of housing 41, thereby is convenient to be formed on the thawing of the ice on the matrix.

Flow out exhaust outlet 42 by the resulting water of defrosting and enter in the discharge pipe 43, this discharge pipe 43 is downloaded to water transport in the feeder 18.By means of the pipeline of the gas of the heat that makes water by leaving compressor 17, water advantageously is evaporated from this groove, makes the temperature of the gas in this pipeline descend before entering condenser 21.

Another resistance 44 is positioned in the pipeline 43, and this another resistance 44 is applicable to and stops water to freeze the hole of blocking pipeline 43 again.

Therefore, even door is in partly once in a while open, She Ji cooling device can not endanger the product that is displayed yet like this.

When temperature reached, during compressor 17 quit work, check valve 27 guaranteed that the gas of a large amount of heat can not turn back to evaporimeter 37, makes glass condensate and mist can not occur.

Claims

1. cooling device that is used for vertical showcase, this cooling device comprises: box-shaped body (10), in described box-shaped body (10), in display part (14), have the screen work or the shelf (12) of variable number, be used to hold the product that will be maintained at controlled temperature

Cooling group (13), comprise compressor (17), aerial condenser (21) and at least one fan (20), described compressor is suitable for compressing refrigerating gas, described cooling group is suitable for reducing heat and by cooling circuit described gas is supplied to evaporator bank (15) from compressed gas, described evaporator bank makes described gas expand, make it to cool off and reduce heat from the product that is accommodated in described display part

It is characterized in that described cooling device comprises:

The defrosting loop, in this defrosting loop, before the refrigerating gas of heat is cooled in described condenser (21), remove the refrigerating gas of described heat from described compressor, and the refrigerating gas of described heat is sent to described evaporator bank by means of feeding pipe (29) and the valve (28) that suitably driven.

2. cooling device according to claim 1, wherein, described cooling circuit comprises heat exchanger (26) and thermostatic valve (31), by this thermostatic valve, described gas is transmitted under the temperature that is applicable to described evaporator bank (15).

3. cooling device according to claim 1, wherein, described feeding pipe (29) is separated in its end, make described gas at two inlets (35,36) locate to enter in the evaporimeter, so that the loop is better presented, thus more efficient and carry out defrosting apace and the ice that forms on the fin of evaporimeter (37) is melted.

4. cooling device according to claim 1, wherein, described evaporator bank comprises two resistance (33,39), these two resistance and valve (28) are started by thermoregulator (45) with time ground.

5. cooling device according to claim 1, wherein, described defrosting loop comprises the dual control of carrying out time and temperature by means of thermoregulator (45), wherein, detector (32) interacts with thermoregulator (45), if and effluent air before expeced time, reach+2 ° ,+3 ° temperature, then stop described defrosting.

6. cooling device according to claim 1, wherein, described evaporator bank is coated with closed pore warming plate (38) on the top, and this closed pore warming plate (38) prevention originally forms ice and frost on one's body in described evaporator bank.

7. cooling device according to claim 4, wherein, by means of the plate that shapes and tilt (30), the resistance (39) in the described resistance is held on the bottom of a series of fins that are pressed against described evaporimeter, to promote the discharging of described condensed water.

8. cooling device according to claim 4, wherein, the housing of being made by aluminium sheet (41) covers whole evaporator bank and is manufactured into water, ice or the frost that further collection is run off, and described water, ice or frost are directed to exhaust outlet (42).

9. cooling device according to claim 8, wherein, described second resistance (33) is positioned and is crushed on the inner surface of described housing (41), thereby is convenient to be formed on the thawing of the ice on the matrix.