CN104214997B - The tubular evaparator of two ends shunting bleed - Google Patents

Abstract

The invention discloses a tube-type evaporator with split air flow at both ends, and provides an evaporator capable of improving the heat transfer performance of the evaporator and improving the performance of a refrigeration system. One end of the refrigerant inlet of the uppermost row of heat exchange tubes is connected to the liquid distribution pipe, and one end of each row of heat exchange tubes used as the refrigerant inlet is connected to a liquid elbow; one end of the refrigerant outlet of the bottom row of heat exchange tubes is connected to the The second return pipe is connected, and the other end of each row of heat exchange tubes is connected with a shunt pipe as the outlet of the refrigerant; the shunt pipes corresponding to the same side of the adjacent row are connected with the liquid elbow to form a connected refrigerant flow channel; the shunt on one side The tube is connected to the first air return pipe through the left air induction elbow, and the shunt pipe on the other side is connected to the second air return pipe through the right air induction elbow. The two ends of the heat exchange tubes of each process of the evaporator are respectively connected with a shunt tube, a liquid elbow and an air induction elbow, which can increase the liquid wetting ratio in the tube, improve the heat transfer performance of the evaporator, and improve the performance of the refrigeration system .

Description

Tubular evaporator with split air at both ends

technical field

The invention relates to the technical field of refrigeration, in particular to a tube-type evaporator with two ends splitting and leading air.

Background technique

The air cooler for cooling the air in the refrigeration system often adopts a finned tube evaporator in which the refrigerant flows in and out from the top and the bottom goes out. The refrigerant flows in the tube and boils, and the ratio of the gas in the tube gradually increases. The wetting ratio of the evaporator gradually decreases, which will lead to dryness in the tube, which will seriously affect the heat transfer performance of the evaporator and cause the performance of the refrigeration system to decline.

Contents of the invention

The object of the present invention is to aim at the technical defects existing in the prior art, and provide a tube type evaporator which can improve the heat transfer performance of the evaporator and improve the performance of the refrigeration system.

The technical scheme adopted for realizing the purpose of the present invention is:

A tube-type evaporator with split air flow at both ends, including multiple rows of heat exchange tubes, one end of the refrigerant inlet of the uppermost row of the heat exchange tubes is connected to the liquid distribution tube, and the rest of the heat exchange tubes in each row are used as One end of the refrigerant inlet is respectively connected to a liquid elbow; one end of the refrigerant outlet of the bottom row of heat exchange tubes is connected to the second return air pipe, and one end of the other heat exchange tubes in each row is used as a refrigerant outlet. A closed shunt pipe is connected; the shunt pipes corresponding to the same side of adjacent rows are connected with the liquid elbow to form a connected refrigerant flow channel; the shunt pipes on one side pass through the left air induction elbow and The first air return pipe is connected, and the shunt pipe on the other side is respectively connected with the second air return pipe through the right air induction elbow.

The left air-inducing elbow and the right air-inducing elbow are respectively connected to the upper part of the shunt pipe.

The liquid elbow is connected to the lower end of the branch pipe.

Each of the branch pipes is perpendicular to the corresponding heat exchange pipe.

Fins are respectively installed on each of the heat exchange tubes.

Compared with prior art, the beneficial effect of the present invention is:

1. In the evaporator of the present invention, the two ends of the heat exchange tubes of each process are respectively connected with a shunt pipe, a liquid elbow, and an air-introduced elbow. With the evaporation and boiling of the refrigerant flow process, the refrigerant is transferred into the shunt pipe. The gas and liquid are separated, and the gas is led out from both ends of the heat exchange tubes of each process in time through the air-introduced elbow, which can increase the liquid wetting ratio in the tube, improve the heat transfer performance of the evaporator, improve the performance of the refrigeration system, and save energy. energy, protect the environment.

2. The finned tube evaporator of the present invention with air-introduction at both ends is simple in structure, convenient in processing and assembly, safe and reliable, energy-saving and environment-friendly.

Description of drawings

Fig. 1 shows the schematic diagram of the tubular evaporator with both ends of the present invention split flow air;

Fig. 2 is the A direction view of Fig. 1;

FIG. 3 is a view taken along direction B of FIG. 1 .

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The tubular evaporator with both ends splitting and air-introduction of the present invention is a structure in which an exhaust part is added to the structure of the existing tubular evaporator. Including multiple rows of heat exchange tubes, one end of the refrigerant inlet of the heat exchange tube in the uppermost row is connected to the liquid distribution pipe, and one end of each row of the heat exchange tubes used as the refrigerant inlet is respectively connected to a liquid elbow; the last One end of the refrigerant outlet of the heat exchange tubes in the lower row is connected to the second air return pipe, and one end of the remaining heat exchange tubes in each row as the refrigerant outlet is respectively connected to a closed shunt pipe; The corresponding branch pipe is connected with the liquid elbow to form a connected refrigerant flow channel; the branch pipe on one side is respectively connected to the first air return pipe through the left air induction elbow, and the branch pipe on the other side The pipes are respectively connected with the second air return pipe through the right air induction elbow.

Wherein, the left air induction elbow and the right air induction elbow are respectively connected to the upper part of the shunt pipe, and the liquid elbow is connected to the lower end of the shunt pipe. Each of the branch pipes is perpendicular to the corresponding heat exchange pipe.

In the following, a tube-fin evaporator with 8 rows of heat exchange tube bundles will be taken as a specific embodiment to describe in detail.

The schematic diagram of the tubular evaporator with 8 rows of heat exchange tube bundles and air-introduction at both ends of the present invention is shown in Figures 1-3, including a first heat exchange tube 2-1, a second heat exchange tube 2-2, a second heat exchange tube 2-2, Three heat exchange tubes 2-3, fourth heat exchange tubes 2-4, fifth heat exchange tubes 2-5, sixth heat exchange tubes 2-6, seventh heat exchange tubes 2-7 and eighth heat exchange tubes 2 -8, the first heat exchange tube 2-2 is the uppermost heat exchange tube, one end of the refrigerant inlet is connected to the liquid distribution pipe 3, one end of the refrigerant outlet is connected to the first distribution pipe 5-1, and the second heat exchange tube 2-2 One end of the refrigerant inlet is connected to the first liquid elbow 8-1, one end of the second heat exchange tube 2-2 the refrigerant outlet is connected to the second branch pipe 5-2, and the third heat exchange tube 2-3 One end of the refrigerant inlet is connected to the second liquid elbow 8-2, one end of the refrigerant outlet of the third heat exchange tube 2-3 is connected to the third branch pipe 5-3, and the fourth heat exchange tube 2-4 is the refrigerant inlet One end of the refrigerant outlet is connected to the third liquid elbow 8-3, one end of the refrigerant outlet of the fourth heat exchange tube is connected to the fourth branch pipe 5-4, and one end of the refrigerant inlet of the fifth heat exchange tube 2-5 is connected to the fourth liquid The elbow 8-4 is connected, one end of the refrigerant outlet of the fifth heat exchange tube 2-5 is connected with the fifth branch pipe 5-5, one end of the refrigerant inlet of the sixth heat exchange tube 2-6 is connected with the fifth liquid elbow 8 -5 connection, one end of the refrigerant outlet of the sixth heat exchange tube 2-6 is connected with the sixth branch pipe 5-6, one end of the refrigerant inlet of the seventh heat exchange tube 2-7 is connected with the sixth liquid elbow 8-6 , one end of the refrigerant outlet of the seventh heat exchange tube 2-7 is connected with the seventh branch pipe 5-7, one end of the refrigerant inlet of the eighth heat exchange tube 2-8 is connected with the seventh liquid elbow 8-7, and the eighth One end of the refrigerant outlet of the heat exchange tube as the bottom row of the heat exchange tube is connected to the second air return pipe 4 . The first branch pipe 5-1 on the same side of the evaporator is connected to the first liquid elbow 8-1, the third branch pipe 5-3 is connected to the third liquid elbow 8-3, and the fifth branch pipe 5-5 is connected to the third liquid elbow 8-3. The fifth liquid elbow 8-5 is connected, and the seventh branch pipe 5-7 is connected with the seventh liquid elbow 8-7. On the other side of the evaporator, the second branch pipe 5-2 is connected to the second liquid elbow 8-2, the fourth branch pipe 5-4 is connected to the fourth liquid elbow 8-4, and the sixth branch pipe 5- 6 is connected to the sixth liquid elbow 8-6, so that the first heat exchange tube 2-1, the second heat exchange tube 2-2, the third heat exchange tube 2-3, the fourth heat exchange tube 2-4, The fifth heat exchange tube 2-5, the sixth heat exchange tube 2-6, the seventh heat exchange tube 2-7 and the eighth heat exchange tube 2-8 are connected to form a refrigerant flow channel. Evaporator side: the first shunt pipe 5-1 is connected to the first air return pipe 1 through the first left air inlet elbow 6-1, and the third shunt pipe 5-3 is connected through the second left air inlet elbow 6- 2 is connected to the first air return pipe 1, the fifth shunt pipe 5-5 is connected to the first air return pipe 1 through the third left bleed air elbow 6-3, and the seventh shunt pipe 5-7 is bleed through the fourth left air Elbow 6-4 is connected with first air return pipe 1. On the other side of the evaporator: the second shunt pipe 5-2 is connected to the second air return pipe 4 through the first right bleed air elbow 7-1, and the fourth shunt pipe 5-4 passes through the second right bleed air bend The pipe 7-2 is connected to the second air return pipe 4, and the sixth shunt pipe 5-6 is connected to the second air return pipe 4 through the third right bleed air elbow 7-3.

Fins 9 are respectively installed on each of the heat exchange tubes.

In the refrigeration system, the liquid distribution pipe 3 is connected with the outlet of the thermal expansion valve of the refrigeration system, and the first air return pipe 1 and the second air return pipe 4 are connected with the intake pipe of the refrigeration compressor. The low-temperature and low-pressure refrigerant liquid after interception and decompression enters the channel of the first heat exchange tube 2-1 through the liquid distribution pipe 3, and the gas and liquid mixed fluid after absorbing heat and evaporating enters the space of the first distribution pipe 5-1 , the gases and liquids of different densities are separated, the gas flows from the inner channel of the first left bleed air elbow 6-1 of the first shunt pipe 5-1 to the first return air pipe 1, and the liquid flows from the bottom of the first shunt pipe 5-1 The first liquid elbow 8-1 enters the channel of the second heat exchange tube 2-2, and the gas and liquid mixed fluid after absorbing heat and evaporation enters the space of the second branch pipe 5-2, and the gas and liquid of different densities are separated, The gas flows from the passage in the first right bleed air elbow 7-1 connected to the second shunt pipe 5-2 to the second air return pipe 4, and the liquid flows from the second liquid elbow 8 at the bottom of the second shunt pipe 5-2. -2 enters the channel of the third heat exchange tube 2-3, the gas and liquid mixed fluid after absorbing heat and evaporation enters the space of the third branch pipe 5-3, the gas and liquid of different densities are separated, and the gas flows from the third branch pipe The passage in the second left side bleed air elbow 6-2 connected to 5-3 flows to the first air return pipe 1, and the liquid enters the fourth air exchange pipe 8-3 from the third liquid elbow 8-3 at the bottom of the third shunt pipe 5-3. In the channel of the heat pipe 2-4, the mixed fluid of gas and liquid after absorbing heat and evaporation enters the space of the fourth branch pipe 5-4, and the gas and liquid of different densities are separated, and the gas is connected from the fourth branch pipe 5-4. The channel in the second right side bleed air elbow 7-2 flows to the second air return pipe 4, and the liquid enters the fifth heat exchange tube 2-5 from the fourth liquid elbow 8-4 at the bottom of the fourth shunt pipe 5-4. In the passage, the gas and liquid mixed fluid after endothermic evaporation enters the space of the fifth branch pipe 5-5, and the gas and liquid of different densities are separated, and the gas is introduced from the third left side connected to the fifth branch pipe 5-5 The channel in the elbow 6-3 flows to the first air return pipe 1, and the liquid enters the channel of the sixth heat exchange tube 2-6 from the fifth liquid elbow 8-5 at the bottom of the fifth branch pipe 5-5, absorbing heat and evaporating The final gas and liquid mixed fluid enters the space of the sixth shunt pipe 5-6, and the gas and liquid of different densities are separated, and the gas flows from the third right bleed air elbow 7-3 connected to the sixth shunt pipe 5-6. The channel flows to the second air return pipe 4, and the liquid enters the channel of the seventh heat exchange tube 2-7 from the sixth liquid elbow 8-6 at the bottom of the sixth branch pipe 5-6, and the gas and liquid mixed after absorbing heat and evaporating The fluid enters the space of the seventh shunt pipe 5-7, and the gas and liquid of different densities are separated, and the gas flows from the channel in the fourth left bleed elbow 6-4 connected to the seventh shunt pipe 5-7 to the first round. Air pipe 1, the liquid enters the channel of the eighth heat exchange pipe 2-8 from the seventh liquid elbow 8-7 at the bottom of the seventh shunt pipe 5-7, and the gas absorbed and evaporated flows to the second air return pipe 4, the first The gas in the air return pipe 1 and the second air return pipe 4 returns to the compressor, and the low-temperature and low-pressure refrigerant liquid flows in the heat exchange pipe, absorbing the heat of the air flowing outside the pipe, and providing a cold source for the cold space.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (3)

1. A tube-type evaporator with split flow and air-introduction at both ends, comprising multiple rows of heat exchange tubes, characterized in that one end of the refrigerant inlet of the heat exchange tubes in the uppermost row is connected to the liquid pipe, and the rest of each row One end of the heat exchange tubes used as the refrigerant inlet is respectively connected to a liquid elbow; one end of the refrigerant outlet of the bottom row of the heat exchange tubes is connected to the second return air pipe, and the other ends of each row of the heat exchange tubes are used as One end of the refrigerant outlet is respectively connected with a closed branch pipe; the branch pipes corresponding to the same side of the adjacent row are connected with the liquid elbow to form a connected refrigerant flow channel; the branch pipes on one side pass through the left side respectively. The side bleed air elbow is connected to the first air return pipe, and the shunt pipe on the other side is connected to the second air return pipe through the right bleed air elbow respectively; the left bleed air elbow and the right bleed air Elbows are respectively connected to the upper parts of the distribution pipes; the liquid elbows are connected to the lower ends of the distribution pipes. 2 . The tubular evaporator with two-end split flow and air-introduction according to claim 1 , wherein each of the split tubes is perpendicular to the corresponding heat exchange tube. 3 . 3 . The tubular evaporator with split air flow at both ends according to claim 2 , wherein fins are installed on each of the heat exchange tubes. 4 .