CN2704016Y

CN2704016Y - Vaporizor for refrigerator

Info

Publication number: CN2704016Y
Application number: CN 200420027605
Authority: CN
Inventors: 余建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-21
Filing date: 2004-05-21
Publication date: 2005-06-08
Anticipated expiration: 2014-05-21

Abstract

The utility model provides a vaporizer for a refrigerator. The upper part of the housing of the vaporizer is provided with at least a nozzle, and a tube bundle of the compact type heat-transfer tube is arranged inside the housing of the vaporizer. Spray space is arranged on the upper part of the tube bundle of the compact type heat-transfer tube inside the housing of the vaporizer, and the bottom of the housing is provided with an air return pipe opening. The high pressure liquid is directly sprayed into the vaporizer and is throttled and atomized by means of the pressure of the high pressure liquid after condensing through the nozzle arranged on the upper part of the housing of the vaporizer. The vaporizer is provided with two narrow passages of air and liquid through the tube bundle of the compact type heat-transfer tube inside the housing, and the falling-film boiling evaporation with strong disturbance and high efficiency is realized. The utility model effectively solves the allocation problem of the low pressure liquid without pouring a large number of refrigerant, the influence of the hydrostatic column is eliminated, the drag loss of the refrigerant side is decreased, and the heat transmission temperature difference is reduced. So the efficiency of the vaporizer is improved remarkably.

Description

The refrigeration plant evaporimeter

Technical field

The utility model relates to a kind of vaporising device that is used for steam compressing air conditioner and refrigeration handpiece Water Chilling Units.

Background technology

At present, the general employing of vaporising device in air-conditioning and the refrigeration handpiece Water Chilling Units is dry type or flooded evaporator.Wherein, flooded evaporator must add a large amount of cold-producing mediums, and consequent hydrostatic column has not only weakened its heat transfer efficiency, has also increased difficulty for simultaneously system oil return, makes set structure complicated; Dry evaporator is then because the refrigerant side long flow path, and drag losses is big, and liquid distribute irregular, particularly in the baffling switching process of multitube journey, two of gas-liquid be separated more feasible liquid thereafter distribute seriously irregular, so its efficient is also low than full-liquid type.

Summary of the invention

Refrigerant charge at flooded evaporator is big, its hydrostatic column to evaporation heat transfer unfavorable and system oil return cold-producing medium difficult and dry evaporator distribute irregular, many deficiencies such as the big efficient of drag losses is low.The utility model provides a kind of refrigeration plant evaporimeter, the little and distributed uniform of refrigerant charge that this evaporimeter is used, thermal efficiency height.

The utility model for the technical scheme that solves its technical problem and adopt is: this refrigeration plant evaporimeter, evaporator shell top is provided with at least one nozzle, be provided with the heat-transfer pipe tube bank in the evaporator shell, heat-transfer pipe tube bank top is provided with the required space of spraying in evaporator shell, and housing bottom is provided with the return-air mouth of pipe.

Heat-transfer pipe in the evaporator shell restrains that centre-to-centre spacing can claim the compact mode to arrange less than 1.25 times of externals diameter of pipe between its adjacent two pipes.

Operation principle of the present utility model is: high pressure liquid refrigerant need not special throttle device but realizes the throttling step-down by the pressure of self by nozzle.Specifically: at the set nozzle in evaporator shell top, utilize after the condensation pressure of highly pressurised liquid self directly to spray into it in evaporimeter by nozzle and make its atomizing, meanwhile highly pressurised liquid is finished its throttling step-down process (substitute conventional evaporator before expansion valve).Low pressure liquid after throttling and the atomizing drop to equably in the housing that the tube bank of compact heat-transfer pipe is gone up and from top to down at it uniform liquid film of each layer formation, thereby realize falling film evaporation.The souring that when flowing through the interbank slype of compact by the gas after the explosive evaporation again in this process the liquid film on each layer pipe face is being produced has strengthened the disturbance of liquid film on each pipe face, makes its film coefficient of heat transfer be able to further raising.

The beneficial effects of the utility model are: directly spray into it in evaporimeter and make its atomizing by the nozzle of pressure through being located at evaporator shell top of highly pressurised liquid after the condensation self, and spraying also impels highly pressurised liquid to realize the throttling step-down; This evaporimeter also by the heat-transfer pipe tube bank of compact arrangement in the housing, is made the gas-liquid two-phase slype, has realized the efficient falling liquid film explosive evaporation of strong disturbance.Therefore under the prerequisite that need not fill a large amount of cold-producing mediums, solve the low pressure liquid assignment problem effectively, eliminated the influence of hydrostatic column, reduced the drag losses of refrigerant side, realized falling liquid film explosive evaporation efficiently, improved the efficient of evaporimeter significantly.

Description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is a structural representation of the present utility model;

The specific embodiment

Embodiment: referring to Fig. 1, a kind of refrigeration plant evaporimeter, evaporator shell top are provided with at least one nozzle 2, are provided with heat-transfer pipe tube bank 4 in the evaporator shell 3, heat-transfer pipe is restrained 4 tops and is provided with the required space 6 of spraying in evaporator shell 3, and housing bottom is provided with the return-air mouth of pipe 5.

Centre-to-centre spacing is less than 1.25 times of externals diameter of pipe between heat-transfer pipe tube bank 4 its adjacent two pipes in the evaporator shell 3.

Operation principle of the present utility model and process are: what the refrigeration plant that the utility model provides adopted on the whole with evaporimeter is the shell-tube type structure, its end socket bobbin carriage and pipe and housing be connected all same flooded evaporator, its difference is to have set up one or more nozzles on the top of evaporimeter.The highly pressurised liquid that connects the self-desiccation filter is directly delivered to the nozzle 2 of being located at evaporator shell top behind flow control valve 1.This flow control valve 1 adopts high-precision electrical adjustment valve, and its control principle is identical with the electric expansion valve that uses now, and just the difference because of the valve body structure does not possess throttling function.The highly pressurised liquid of delivering to nozzle sprays into evaporimeter and produces atomizing by the pressure of self, has also finished throttling step-down process simultaneously.Be provided with the required space of spraying on evaporator shell 3 tops.The quantity of nozzle can be determined according to shell length and desired spray shapes, with the uniformity that guarantees that liquid distributes.Liquid after the throttling atomizing intersperses among the upper space of evaporimeter equably, landing accumulates on the upper strata pipe face of compact heat-transfer pipe tube bank 4 in the housing and forms uniform liquid film equably under the double action of himself gravity and compressor air suction pressure, has begun the falling film evaporation process thus.Because of liquid gathers the restriction that is subjected to thickness of liquid film on the pipe face of upper strata, excess liquid will together with the gas behind the ebullition, gasification on the pipe face of upper strata successively downwards drippage flow and on lower floor's pipe face, successively form uniform liquid film, until all " evaporate to dryness ".In this process, narrow and small because of the gap between compact heat-transfer pipe tube bank pipe again, gas after the explosive evaporation is when the slype of flowing pipe interfascicular, can produce certain souring to the liquid film on each layer pipe face, thereby strengthened the disturbance of liquid film on each pipe face, made its film coefficient of heat transfer be able to further raising.At last, the gas that has gasified is being carried isolated lubricating oil secretly and is being got back to compressor through the return-air mouth of pipe 5 of being located at housing bottom, thereby finishes whole explosive evaporation processes.

Claims

1. refrigeration plant evaporimeter, it is characterized in that: evaporator shell top is provided with at least one nozzle (2), be provided with heat-transfer pipe tube bank (4) in the evaporator shell (3), heat-transfer pipe tube bank (4) top is provided with the required space (6) of spraying in evaporator shell (3), and housing bottom is provided with the return-air mouth of pipe (5).

2. refrigeration plant evaporimeter according to claim 1 is characterized in that: centre-to-centre spacing is less than 1.25 times of externals diameter of pipe between heat-transfer pipe tube bank (4) its adjacent two pipes in the evaporator shell (3).