CN2050581U - Screw arbor economical apparatus liquid subcooler for ammonia - Google Patents

Abstract

The utility model relates to a liquid subcooler for ammonia for a screw rod economizer. The system of the screw rod economizer is an energy-saving refrigeration system which is pushed out by international and national refrigeration industries the beginning of eighties. The utility model carries out a breakthrough improvement aiming at the defects that the refrigeration liquid of a traditional shell-and-pipe type heat exchanger in the system has low flow rate, and can only lie in a ' laminar flow ' state to realize low-efficiency heat exchange, and pushes out the vertical liquid subcooler with a spiral metal-pipe structure of the utility model, which is characterized in that the liquid subcooler is composed of the components of the metal pipe (2) with a small pipe diameter, a core body (6) for the subcooler, a casing body (7), etc. The high-efficiency heat exchange of the refrigeration liquid under the state of ' vigorous turbulent flow ' is realized. Thereby, the volume and the weight of the liquor subcooler are lightened, and at same time the loss of temperature difference is also reduced considerably.

Description

Screw arbor economical apparatus liquid subcooler for ammonia

The utility model relates to a kind of a kind of new liquid subcooler (heat exchanger) that is used for screw rod economizer refrigeration system.

" screw rod economizer system " is a kind of energy-conserving refrigeration system that the early eighties world, the development of domestic refrigeration industry are released; Compare with basic refrigeration system, it is characterized in that: addition the return-air compensating port (20) of screw host (14), liquid subcooler (17) and auxiliary throttle valve (16), obtaining bigger degree of supercooling so that enter the work refrigerating fluid of primary throttle valve (18), is energy-conservation effect thereby obtain raising system refrigerating efficiency.

Existing screw rod economizer system generally adopts shell-tube type liquid subcooler, the technical essential of this kind shell-tube type structure is: a kind of form is that refrigerating fluid enters from inlet (13), flows through one group of metal pipe and outer from being flowed out by liquid outlet (12) again after the auxiliary cooling liquid heat exchange of auxiliary throttle valve (16) with pipe; Another kind of form is that refrigerating fluid enters from inlet (9), and through dividing plate (10) guiding, interbank many slits that auxiliary cooling liquid is being flowed in the inside of flowing through after the realization heat exchange, flow out through liquid outlet (11) again.

The open defect of the shell-tube type liquid subcooler of above-mentioned two kinds of forms is: the refrigerating fluid circulation area is big, and flow velocity is low, has only usually below the 0.1m/S, and Reynolds number is very low; That is refrigerating fluid can only be under not high " laminar flow " state of the coefficient of heat transfer and carries out heat exchange.Therefore, want to obtain big heat exchange amount, certainly will can only strengthen heat transfer area, volume, the weight that promptly increases this device is that cost exchanges for.

The utility model has carried out breakthrough improvement at the above-mentioned significant deficiency of shell-tube type liquid subcooler just; The utility model has utilized: in (1), the screw rod economizer system, when refrigerating fluid is flowed through subcooler, make its temperature descend manyly, even when then falling because of the big slightly bigger pressure of association of resistance, also because of after all from two-phase section generation bubble also far away and unlikely; (2), to fall be exactly that refrigerating fluid enters one of necessary condition before the evaporimeter (primary throttle valve (18) promptly is to bear this function) to pressure originally, then fall in fact overall result such 2 points of having no effect because of resistance has increased precompression partly slightly greatly in the subcooler (17), released the screw rod economizer ammonia liquid subcooler of vertical helical tubular construction.

Of the present utility model being characterised in that: one by small-caliber metal tubes (2) (for different operating mode burden requirements, the utility model is respectively equipped with corresponding caliber) pre-coiled and be supported on subcooler core body (6) on the bearing support (3), be packaged in the outside and have in the housing (7) of inlet (1), liquid outlet (5), supply opening (4), return-air mouth (8); When the work refrigeration ammoniacal liquor that flows out from system's front device condenser (15) when inlet (1) enters subcooler core body (6), because metal tube (2) caliber is very little and the dish curl, cause the refrigeration ammoniacal liquor to obtain very high flow velocity rapidly, usually can reach 0.7～3m/S, Reynolds number can reach more than 50,000, the refrigeration of just working ammoniacal liquor enters into " vigorous turbulent flow " state at the subcooler in-core, with come from auxiliary throttle valve (16) stream and enter in the subcooler housing from supply opening (4) and fill the air after subcooler core body (6) auxiliary refrigeration ammoniacal liquor on every side carries out high efficient heat exchanging, work refrigeration ammoniacal liquor is promptly flowed out by liquid outlet (5), advances primary throttle valve (18) and evaporimeter (19); The auxiliary cooling ammoniacal liquor then flows out from return-air mouth (8), and the gas supplementing opening (20) that is back to screw host (14) is located.

The utility model is owing to realized the high efficient heat exchanging of " vigorous turbulent flow " state, so heat transfer area can significantly reduce, promptly subcooler can be done small and lightly.For example the utility model is compared with the shell-tube type structure: heat transfer area only needs the latter's 30%～40%; Metal consumption then only is the latter's 20%～30%; And temperature difference loss also only is the latter's 20%～33%.

An embodiment of the present utility model:

In the screw rod economizer system of standard condition cold 250,000 KCal/h, a supporting homemade shell-tube type liquid subcooler heat transfer area will reach 4M ², weight reaches 478kg; Use the utility model screw rod economizer ammonia liquid subcooler of a metal tube (2) internal diameter 14mm instead, its heat transfer area only needs 1.2M ², weight is 98.8kg only.In addition, especially it is worthy of note that low temperature differential loss of the present utility model loses, survey above-mentioned economizer system, heat transfer temperature loss of the present utility model only is about 1 ℃, and the shell-tube type liquid subcooler that Japan Kobe is produced, its heat transfer temperature loss is actual to be reached about 5 ℃.

In accompanying drawing 1, accompanying drawing 2, the accompanying drawing 3: (1) is inlet, (2) be metal tube, (3) be bearing support, (4) are supply openings, and (5) are liquid outlets, (6) be core body, (7) be housing, (8) are liquid return holes, and (9) are inlets, (10) be dividing plate, (11) be liquid outlet, (12) are liquid outlets, and (13) are inlets, (14) be screw rod dice   5) be condenser, (16) be auxiliary throttle valve, (17) are the liquid subcoolers, and (18) are primary throttle valves, (19) be evaporimeter, (20) are gas supplementing openings.

Claims (1)

1. A kind of screw rod economizer system ammonia liquid subcooler is characterized in that:

   (1), one by the little caliber pre-coiled of (different operating mode load, the corresponding difference of caliber) metal tube [2] and be supported on the subcooler core body [6] of bearing support [3];

   (2), an outside has inlet [1], liquid outlet [5], supply opening [4], the subcooler covering housing [7] of return-air mouth [8];

   (3), core body [6] is packaged in the housing [7].