CN1995873A

CN1995873A - Two-stage direct-cooling type highly-efficient evaporator

Info

Publication number: CN1995873A
Application number: CN 200610135129
Authority: CN
Inventors: 董令玉; 董春栋
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-28
Filing date: 2006-12-28
Publication date: 2007-07-11

Abstract

The invention relates to a two-stage direct cooling evaporator with high efficiency, comprising mixing cylinder with former connecting plate and feeding tube at the back cover and evaporator jacket out of the assembling cylinder and constituting refrigerant channel with the assembling cylinder. The technological key point is that the refrigerant inlet port of said refrigerant channel is a hollow channel and the refrigerant outlet port is a screw channel, which comprises screw groove with opened section set on the inner wall of evaporator jacket or the outer wall of mixing cylinder and the outer wall of mixing cylinder or the inner wall of evaporator jacket in sealing. It can radically solve following problems of complicated manufacturing process and no reasonable using energy existing in prior technology. The invention with reasonable structure makes refrigerants vaporize by two times and it allocates refrigerating quantity according to need. It not only decreases manufacturing difficulty and producing cost but also is suitable for batch production. It can improve refrigerating effect obviously. Compared with conventional twisted evaporator, the refrigerating effect is improved by 5-7 times. Compared with fin and screw evaporator, finite exchanging energy of refrigerant is used more reasonably.

Description

Two-stage direct-cooling type highly-efficient evaporator

Technical field

The present invention relates to the evaporimeter that a kind of refrigeration plant is used, particularly a kind of have a combine two-stage direct-cooling type highly-efficient evaporator of structure of evaporation air chamber and helical duct.It is mainly used in the refrigeration plant that manufacturing can form ice cream or similar articles.

Background technology

Evaporimeter is the vitals that produces cold and carry out heat exchange in the refrigeration plant.The directly cooling evaporator that refrigeration plant is used for ice cream maker has multiple version, comparatively common have around tubular type, finned, the T type is spiral etc., existing report in pertinent literature.Disclose " a kind of refrigerating evaporator with spiral directly cooling formula structure " as Chinese patent CN2284938Y, its evaporimeter is two-layer tubular structure, and outer tube inner wall is formed a working medium passage by helicla flute.CN2359636Y discloses " refrigeration system high-efficiency evaporator ", wherein stirs cylinder barrel periphery encapsulation internal thread spiral sleeve pipe, working medium passage of the tooth top of outer tube thread and the stirring airtight composition of cylinder barrel periphery wall.CN2490513Y discloses " turning to the refrigerating evaporator of helical duct with section bar ", and its spiral between inner and outer sleeves twines a moulding material, forms a working medium passage by the gap between the spiral forming material.CN2503428Y discloses " direct-cooling type highly-efficient refrigerating evaporator ", and wherein the axially uniform U type groove that is interconnected of outer casing inner wall or mixing drum outer wall is formed a working medium passage.The common technique feature of above-mentioned patent all is all to be provided with an identical working medium passage of structure on the axial entire length of evaporimeter overcoat and between the inner cylinder tube, its operation principle be make compressed cold-producing medium along its passage evenly by the disposable evaporation of carrying out of strong diminuendo.Wherein around tubular evaparator because cold-producing medium absorbs the heat that cylinder barrel spreads out of by the copper pipe passage, and the heat exchange link is more, and the heat exchange area deficiency, so refrigerating speed slowly, inefficiency; And finned-tube evaporator need be welded on fin on the cylinder barrel outer wall, and cold-producing medium absorbs the heat that cylinder barrel spreads out of by operation in its helical duct, though its good heat-transfer, manufacturing process complexity, cost height, production efficiency is low.The spiral evaporimeter of T type, be to stir cylinder barrel periphery encapsulation internal thread spiral sleeve pipe, form the spirality coolant channel, though improved refrigeration to a certain extent, because of the making of working medium passage need be satisfied strict Sealing Technology requirement, so it can only keep assembly precision by machining, therefore, the length of working medium passage is long more, and processing is just difficult more, production cost is just high more, is not suitable for producing in batches.In sum, no matter existing evaporimeter adopts the working medium passage of which kind of geometry, cold-producing medium all is the disposable evaporation by strong diminuendo, and its corridor bulkhead all takies the certain freezing cylinder barrel surface area of undertaking the heat exchange function and the useful space of working medium passage, loses certain refrigerating capacity.Because the previous section of evaporimeter is connecting the outlet of manufactured goods, just be that the exit of manufactured goods needs bigger cold, so be subjected to structural limitations to fail sufficiently and reasonably to distribute effective refrigerating capacity, reduced refrigeration.Therefore, the important topic of the best heat exchange effect of how in the structure of determining, selecting its effective evaporating space just to become scientific and technical personnel to be considered.

Summary of the invention

The purpose of this invention is to provide a kind of two-stage direct-cooling type highly-efficient evaporator, it has fundamentally solved manufacturing process complexity, energy that prior art exists and has failed the problem rationally utilized, its structure distribution is reasonable, cold-producing medium is evaporated at twice, refrigerating capacity is distributed according to need, difficulty of processing and manufacturing cost have not only been reduced, be more suitable for producing in batches, and significantly improve refrigeration, improve 5～7 times than traditional around tubular evaparator, compare with fin-type and spiral evaporimeter, more reasonably utilize the limited commutative energy of cold-producing medium.

The object of the present invention is achieved like this: this device comprises the mixing drum and the outer evaporimeter overcoat that also constitutes coolant channel with it of assembled pot of the rear end cap that has preceding connecting plate and be equipped with feed pipe, its technical essential is: the refrigerant inlet end of described coolant channel is a cavity passage, the refrigerant outlet end is a helical duct, and this helical duct is the helicla flute and the mixing drum outer wall of opening or the evaporimeter outer casing inner wall is airtight forms by the cross section that is provided with on described evaporimeter outer casing inner wall or the mixing drum outer wall.

Described cavity passage axial length is less than or equal to 1/2nd of coolant channel axial length.

Because the refrigerant inlet end of the coolant channel of evaporimeter of the present invention is a cavity passage, it is an evaporation air chamber space that does not have helical duct, so the air chamber space can give compressed cold-producing medium with maximized evaporating space, most cold is concentrated the manufactured goods port of export that exchanges in evaporimeter, and this end be just need be bigger the cold part, therefore can obtain best heat exchange effect.The refrigerant outlet end is a helical duct, cold-producing medium carries out first order evaporation in big evaporating space after, just along this helical duct, carries out evenly being evaporated by the second level of strong diminuendo, and the state that has satisfied cold-producing medium changes necessary path of process and time.Because most cold is concentrated the manufactured goods port of export that exchanges in evaporimeter, temperature of charge in the freezing mixing drum of evaporation feed liquor mouth end will be that past more rear end is high more, so can make last a small amount of liquid refrigerant, under the quick heat-absorbing action of material that the temperature difference is bigger in the corresponding mixing drum in evaporimeter rear end, quicken all to change into gaseous state.The abundant evaporation of cold-producing medium, make compressor be difficult for taking place liquid hit phenomenon, so this apparatus structure distribution rationally, makes cold-producing medium divide double flash evaporation, with refrigerating capacity distribution according to need, fundamentally solved manufacturing process complexity, energy that prior art exists and failed the problem rationally utilized.It replaces helical duct with spatial channel, shortened the helical duct length that working medium is passed through greatly, difficulty of processing and manufacturing cost have not only been reduced, be more suitable for producing in batches, and significantly improve refrigeration, improve 5～7 times than traditional around tubular evaparator, compare, more reasonably utilize the limited commutative energy of cold-producing medium with fin-type and spiral evaporimeter.

Description of drawings

Below in conjunction with accompanying drawing the present invention is further described.

Fig. 1 is the schematic diagram of a kind of concrete structure of the present invention.

The specific embodiment

Describe concrete structure of the present invention in detail according to Fig. 1.This device comprises the mixing drum 3 and the outer parts such as evaporimeter overcoat 4 that also constitute coolant channel with it of assembled pot of the rear end cap 8 that has preceding connecting plate 1 and be equipped with feed pipe 7.Wherein refrigerant inlet 2 ends of coolant channel are a cavity passage, and this cavity passage is an evaporation air chamber space that does not have helical duct.For the state that satisfies cold-producing medium changes the necessary path of process, the cavity passage axial length can determine according to actual needs that its length should be selected for use and be less than or equal to 1/2nd of coolant channel axial length.Refrigerant outlet 6 ends (i.e. the feed pipe that is frozen material 7 ends of close mixing drum 3) are a helical duct, and this helical duct is helicla flute and mixing drum 3 outer walls or airtight the forming of evaporimeter overcoat 4 inwalls of opening by the cross section that is provided with on described evaporimeter overcoat 4 inwalls or mixing drum 3 outer walls.

The T type that circumferentially the is furnished with helicla flute of the outer wall of the inwall of evaporimeter overcoat 4 or mixing drum 3 in this example, and make T type spiral fluted top, airtight with the inwall of the outer wall of mixing drum 3 or evaporimeter overcoat 4, form helical duct.Be assembled in the two ends sealing-in end cap 5 of the evaporimeter overcoat 4 on the mixing drum 3, promptly evaporimeter overcoat 4 two ends are tightly connected with two annular end caps 5 respectively, and end cap 5 inwalls and mixing drum 3 be tightly connected, and prevent the cold-producing medium seepage.Like this, evaporimeter overcoat 4 closely cooperates with mixing drum 3, can make cold-producing medium follow formed enclosed cavity passage and helical duct is smooth and easy flows.

Mixing drum 3 is a hollow-core construction, and its inner chamber is to be frozen the place that material is implemented heat exchange and formed end article.The feed pipe 7 of mixing drum 3 is arranged on above the mixing drum rear end cap 8, and expects that with being frozen of equipment storage system is tightly connected.The discharge port end of mixing drum 3 and preceding connecting plate 1 are tightly connected, and preceding connecting plate 1 is connected with end article bleeder valve door sealing, and is connected with equipment.

Be the intrusion and the system's refrigerating capacity loss that prevent external heat, this device is whole to carry out heat insulation processing with hard polyurethane foam, to guarantee the refrigeration of equipment.

Claims

1, a kind of two-stage direct-cooling type highly-efficient evaporator, comprise connecting plate and the mixing drum of the rear end cap that is equipped with feed pipe and the evaporimeter overcoat that assembled pot also constitutes coolant channel outward with it before having, it is characterized in that: the refrigerant inlet end of described coolant channel is a cavity passage, the refrigerant outlet end is a helical duct, and this helical duct is the helicla flute and the mixing drum outer wall of opening or the evaporimeter outer casing inner wall is airtight forms by the cross section that is provided with on described evaporimeter outer casing inner wall or the mixing drum outer wall.

2, two-stage direct-cooling type highly-efficient evaporator according to claim 1 is characterized in that: described cavity passage axial length is less than or equal to 1/2nd of helical duct axial length.