CN1530596A

CN1530596A - Opening showcases

Info

Publication number: CN1530596A
Application number: CNA2004100084959A
Authority: CN
Inventors: 岩崎正道; 哉; 中山和哉
Original assignee: Fuji Electric Retail Systems Co Ltd
Current assignee: Fuji Electric Retail Systems Co Ltd
Priority date: 2003-03-13
Filing date: 2004-03-12
Publication date: 2004-09-22
Anticipated expiration: 2024-03-12
Also published as: JP2004278864A; CN1263988C

Abstract

An air flow blow out opening 7 forming air curtain 9 at an open surface of a goods storage chamber is divided into three flow passages of a center main flow passage 15, a front and a rear accessory flow passage 16, 17. Flow speed of air flow blown out of the accessory flow passages 16, 17 is made higher than that out of the main flow passage 15. Reverse swirl toward an accessory flow 20 from a main flow 19 is generated by putting the min flow 19 blown out of the main flow passage 15 between accessory flows 20 of higher flow speed blown out of the accessory flow passages 16, 17 to control development of swirl entraining outer air into the air curtain 9.

Description

Open-type display case

Technical field

The present invention relates to the cold air circulating open-type display case, be specifically related to be formed at the gas curtain of the open surface of wareroom.

Background technology

Such as, the multiple field open-type display case of cold air circulating has been described, if further represent the structure that it is general, then as shown in Figure 3 in patent documentation 1.In Fig. 3, the inside of the showcase main body 1 of opening is divided to be separated with to constitute the wareroom 2 that commodity take out the open-front of face in front, around it, in the illustrated case, is provided with inside and outside two-layer circulating ventilation road 3 and 4.In the bottom space of the showcase main body 1 of passing through this circulating ventilation road 3 and 4, be provided with Air Blast fan 5, ventilation road, inboard 3 is provided with cooler 6.In the blow-off outlet 7 of the air-flow of the open-topped circulating ventilation path 3,4 in the front of wareroom 2, be assembled with the rectification part 8 of honeycomb.

In such open-type display case, if make Air Blast fan 5 runnings, then air-flow is on circulating ventilation road 3, circulate along the direction of arrow in 4, from corresponding blow-off outlet 7, the air-flow that blows out by rectification part 8 forms inside and outside two-layer gas curtain 9 and 10 on the open surface of wareroom 2, wareroom 2 and outer air bound are opened extremely.In the case, the air communication subcooler 6 of circulation in ventilation road, inboard 4 and cooling off forms cold air, realizes circulation, simultaneously, the commodity 12 on the commodity shelf 11 of the inside that is arranged at wareroom 2 according to multilayer is cooled off.On the other hand, the outside gas curtain 10 that is formed by uncooled air (non-cold air) has the effect of the inboard gas curtain 9 that protection forms by cold air.Generally, the flow velocity of inboard gas curtain 9 is greater than outside gas curtain 10.

Patent documentation 1

Te Kaiping 11-325698 document

But the gas curtain that is formed by injection stream promptly blocks producing eddy current in the layer generally in the different boundary layer in abutting connection with air of flow velocity, can't avoid the moving mutually of air at the place, gas curtain both sides that this eddy current produces.Equally in above-mentioned open-type display case, as shown in Figure 4, block small-scale eddy current row 13 growths that the unstability of layer causes, they converge mutually, and form extensive eddy current 13a.By extensive eddy current 13a, be involved in outer gas in the outside gas curtain 10, inboard gas curtain 9 be involved in adjacency outside gas curtain 10 non-cold air and realize circulation.The gas curtain that is entangled in of the non-cold air at cold air gas curtain place is bigger under 1 layer the situation of open-type display case.Thus, open-type display case is compared with built-in (reachin) showcase etc., has to increase required refrigerating capacity.

Summary of the invention

Problem of the present invention is that in open-type display case being involved in of the outer gas that the inhibition gas curtain causes reduces required refrigerating capacity.

In order to solve above-mentioned problem, the present invention relates to a kind of open-type display case, in this open-type display case body interior, divide and be separated with the wareroom that commodity taking-up face opens wide, around this wareroom, be provided with the circulating ventilation road, by the air-flow that in this circulating ventilation road, circulates, in the open surface of above-mentioned wareroom, form gas curtain, it is characterized in that, the blow-off outlet that forms the air-flow of above-mentioned gas curtain is divided into three streams that two secondary flow roads by the primary flow path of centre and its both sides form, and the flow velocity of the air-flow that blows out from above-mentioned secondary flow road is greater than above-mentioned primary flow path.

Form near the less eddy current of air-flow generation blow-off outlet of gas curtain, and along with away from blow-off outlet since with the speed difference of adjacency air, the air of gas curtain both sides be involved in make the eddy current growth.So, in the both sides of the air-flow that blows out from primary flow path (main flow), with flow velocity greater than main flow, formation thus, produces from the reverse eddy current of main flow towards secondary flow from the air-flow (secondary flow) on secondary flow road, consequently, suppress the expansion of the eddy current of main flow, reduce being involved in of outer gas in gas curtain.

In aspect the of the present invention the 1st, the flow velocity on above-mentioned secondary flow road can be more than the twice of above-mentioned primary flow path.

In aspect the of the present invention the 1st and the 2nd, can in above-mentioned primary flow path, be assembled with rectification part.In addition, can in above-mentioned primary flow path and secondary flow road, be assembled with the rectification metal net.

In the present invention the 1st～4 either side, the flow of the air-flow that blows out from above-mentioned secondary flow road is better greater than above-mentioned primary flow path.Particularly, the flow on above-mentioned secondary flow road is suitably for the twice of above-mentioned primary flow path.

Description of drawings

Fig. 1 is the longitudinal sectional view of the air-flow blowing outlet of the open-type display case of expression embodiments of the present invention;

Fig. 2 is the figure of stream condition of the gas curtain of presentation graphs 1;

Fig. 3 is the longitudinal sectional view of the structure of the existing open-type display case of expression;

Fig. 4 is the figure of stream condition of the gas curtain of presentation graphs 3.

Label declaration: 3 circulating ventilation roads; 7 blow-off outlets; 8 rectification parts; 9 gas curtains; 13 eddy current; 14 demarcation strips; 15 primary flow path; 16 secondary flow roads; 17 secondary flow roads; 18 wind direction guides; 19 main flows; 20 secondary floies; 21 reverse vortexes; 22 rectification metal nets.

Concrete form of implementation

Fig. 1 is the longitudinal sectional view of inboard (cold air) blow-off outlet of the two-layer gas curtain of the multi-layered type open-type display case of expression embodiments of the present invention, and the right side of Fig. 1 is the inboard, chamber, and the left side is the outside.In addition, adopt same label with the corresponding part of conventional example.In Fig. 1, the blow-off outlet 7 that the internal face of the front and back that are parallel to each other is relative by the two piece demarcation strips 14 parallel with the front and back inwall of blow-off outlet 7, is divided into by the primary flow path 15 of centre and two

secondary flow roads

16 and 17 three streams that constitute of both sides before and after it.In primary flow path 15, be assembled with the rectification part 8 of honeycomb.In addition, in primary flow path 15 and

secondary flow road

16,17, be assembled with rectification metal net 21.On the top ends of demarcation strip 14, wind direction guide 18 is the ㄑ oxbow, crosses wind direction guide 18 along the air communication that the direction of arrow circulates in circulating cold air ventilation road 3, and flow proportional is according to the rules distributed to each stream 15～17.

In such blow-off outlet structure, the gas curtain 9 that the air-flow that blows out from blow-off outlet 7 forms is made of main flow 19 and secondary flow 20, and this main flow 19 blows out from primary flow path 15, and this secondary flow 20 is in the both sides, front and back, blows out from

secondary flow road

16,17 according to the mode parallel with main flow 19.Here, the flow velocity of secondary flow 20 is greater than main flow 19, such as, be 2～4 times of the latter.That is the main flow 19 of Gao Su secondary flow 20 clamping low speed.In addition, about flow, the specific discharge of secondary flow 20 is substantially than main flow 19 big twices.Such assignment of traffic is adjusted flow path resistance and realization easily by assembling wind direction guide 18, rectification metal net 22.

The state of the air-flow of the gas curtain 9 of Fig. 2 presentation graphs 1.In Fig. 2,, form the small-scale eddy current row 13 that the unstability of blocking layer causes blocking in the layer of the both sides of main flow 19.These eddy current row 13 can form towards the downstream, and in the both sides of main flow 19, have secondary flow 20 at a high speed, produce from the reverse eddy current 21 of main flow 19 towards secondary flow 20.Consequently, suppress the expansion of the small-scale eddy current row 13 of main flow 19, the diffusion that reduces extensive eddy current 13a mixes being involved in to the outer gas of gas curtain 9 of causing.

Fig. 1 represents inboard cold air gas curtain 9, and still, the gas curtain of the outside (non-cold air) also constitutes according to identical mode.In the case, the flow velocity of outside gas curtain on the whole can be greater than inboard gas curtain.In addition, only there is the individual layer gas curtain of cold air gas curtain also to constitute according to identical mode.In addition, in the illustrated embodiment, provide the example of the multi-layered type open-type display case of front openings, still, the present invention also can be used for the open-type display case of other form, such as, the flat pattern open-type display case of end face opening.

As above-mentioned, according to the present invention, gas curtain is made of main flow and secondary flow, and this secondary flow is according to the flow velocity greater than main flow, and the both sides of this main flow of clamping thus, can suppress to be involved in the expansion of the eddy current that outer gas is arranged, and reduce the required refrigerating capacity of open-type display case significantly.Confirm according to the result of the test of in the physical device of existing structure, carrying out, according to than existing 40% the refrigerating capacity that lack, realize with at present identical chamber in mean temperature, the present reduction of maximum temperature ratio is nearly 1 ℃ in the chamber.

Claims

1. open-type display case, in this showcase main body, divide and be separated with the wareroom that commodity taking-up face opens wide, around this wareroom, be provided with the circulating ventilation road, by the air-flow that in this circulating ventilation road, circulates, in the open surface of described wareroom, form gas curtain, it is characterized in that

The blow-off outlet that forms the air-flow of described gas curtain is divided into three streams that two secondary flow roads by the primary flow path of centre and its both sides form, and the flow velocity of the air-flow that blows out from described secondary flow road is greater than described primary flow path.

2. open-type display case according to claim 1 is characterized in that, the flow velocity on described secondary flow road is more than the twice of described primary flow path.

3. open-type display case according to claim 2 is characterized in that, is assembled with rectification part in described primary flow path.

4. open-type display case according to claim 3 is characterized in that, is assembled with the rectification metal net in described primary flow path and secondary flow road.

5. according to each described open-type display case in the claim 1～4, it is characterized in that the flow of the air-flow that blows out from described secondary flow road is greater than described primary flow path.

6. open-type display case according to claim 5 is characterized in that, the flow on described secondary flow road is about the twice of described primary flow path.