CN104266412B - The tubular evaparator of middle bleed - Google Patents

Abstract

The invention discloses a kind of tubular evaparator of middle bleed, a kind of heat transfer property that can improve evaporimeter is provided, improve the evaporimeter of refrigeration system runnability.Heat exchanger tube one end of first row is connected with separating tube, one end that the homonymy of the heat exchanger tube of adjacent row is corresponding connects respectively by the isocon closed, each isocon is connected with bleed bend pipe, every root bleed bend pipe is communicated with discharge respectively, connected by bleed straight tube between the discharge that homonymy is adjacent, the refrigerant outlet end of the heat exchanger tube of end row is directly or indirectly connected with return-air house steward; The discharge of least significant end is communicated with return-air house steward by air entraining pipe.The gas produced in this evaporator evaporation process is after each isocon is separated, draw from each bleed bend pipe, decrease the gas content flowed in heat exchanger tube below, the wetting flowing of high liquid in holding tube, add the wetability of heat exchange liquid in pipe, enhance the heat-transfer effect of evaporimeter, improve the runnability of refrigeration system.

Description

Tube evaporator with intermediate bleed air

technical field

The invention relates to the technical field of refrigeration, in particular to a tubular evaporator with intermediate bleed air.

Background technique

The evaporator, which is widely used in the refrigeration system to directly cool the air, is mostly in the form of a finned tube structure in order to enhance the heat transfer effect. As the refrigerant flows in the tube and continuously evaporates and boils, the gas ratio in the tube gradually increases, and the refrigerant The wetting ratio of the liquid to the inner surface of the heat exchange tube is gradually reduced, which will lead to serious dryness in the tube, 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 to provide a tube-type evaporator with intermediate bleed air which can improve the heat transfer performance of the evaporator and improve the operation performance of the refrigeration system.

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

A tube-type evaporator with intermediate bleed air, including multiple rows of heat exchange tubes, one end of the first row of the heat exchange tubes is connected to the liquid distribution tube, and the corresponding ends of the same side of the adjacent rows of the heat exchange tubes are respectively Connected by a closed shunt pipe, each of the shunt pipes is connected with an air-introduction elbow, and each of the air-introduction elbows is respectively connected with the air collection pipe, and the adjacent air collection pipes on the same side are connected through the air-induction straight pipe. The refrigerant outlet end of the last row of heat exchange tubes is directly or indirectly connected to the return air main pipe; the most end of the air collecting pipe communicates with the return air main pipe through the air induction pipe; the heat in the heat exchange tubes The evaporating and boiling refrigerant gas is separated by each branch pipe, then led out from each air induction elbow, and flows into the return air main pipe through the air collection pipe, the air induction straight pipe and the air induction pipe.

Corresponding to the refrigerant inlet end of each of the heat exchange tubes, a liquid baffle is respectively arranged.

The refrigerant outlet end corresponding to each of the heat exchange tubes is respectively inserted into the distribution tube tangentially.

One side of the liquid baffle is welded to the bottom of the refrigerant inlet end corresponding to each of the heat exchange tubes and the inner wall of the distribution tube along the length direction, and one side is inclined upward.

Each of the distribution pipes and gas collection pipes is arranged along the horizontal direction.

From the first row of heat exchange tubes to the last row of heat exchange tubes, the diameters of the air collecting pipes and the air-introducing straight pipes gradually increase from small to large.

Fins are installed on each of the heat exchange tubes.

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

1. In the tubular evaporator with the refrigerant entering from the bottom and exiting from the top of the present invention, adjacent rows of heat exchange tubes are connected by shunt pipes, and the gas generated during the evaporation process is separated by each shunt pipe and then drawn out from each air-introduction elbow. It reduces the gas content flowing into the heat exchange tube at the back, keeps the high liquid wetting flow in the tube, increases the wettability of the liquid in the heat exchange tube, strengthens the heat transfer effect of the evaporator, improves the operation performance of the refrigeration system, and is conducive to saving energy. protect environment.

2. The tubular evaporator with air entrainment in the middle of the present invention has a simple structure, convenient processing and assembly, and is safe and reliable.

Description of drawings

Fig. 1 shows the schematic diagram of the tubular evaporator of the intermediate bleed air of the present invention;

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

Fig. 3 shows the B direction view of Fig. 1;

Fig. 4 is a structural diagram of the fluid inlet of the second heat exchange tube.

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 air in the middle of the present invention is a structure in which an exhaust part is added to the structure of the existing tubular evaporator. It includes multiple rows of heat exchange tubes, one end of the heat exchange tubes in the first row is connected to the liquid distribution tube, and the corresponding ends of the same side of the heat exchange tubes in the adjacent row are respectively connected through closed shunt tubes, each of the The shunt pipes are respectively connected to the gas collecting pipes through the air-introducing elbows, and the adjacent air collecting pipes on the same side are connected through the air-inducing straight pipes, and the refrigerant outlet end of the last row of the heat exchange tubes is directly or indirectly connected to the return air. Main pipe connection; the most terminal air collecting pipe communicates with the return air main pipe through the air induction pipe. The refrigerant gas that absorbs heat, evaporates and boils in the heat exchange tubes is separated by each branch pipe, and then is led out from each air induction elbow, and flows into the return air main pipe through the air collection pipe, air induction straight pipe and air induction pipe.

Corresponding to the refrigerant inlet end of each of the heat exchange tubes, a liquid baffle is respectively arranged.

The refrigerant outlet end corresponding to each of the heat exchange tubes is respectively inserted into the distribution tube tangentially.

One side of the liquid baffle is welded to the bottom of the refrigerant inlet end corresponding to each of the heat exchange tubes and the inner wall of the distribution tube along the length direction, and one side is inclined upward.

Each of the distribution pipes and gas collection pipes is arranged along the horizontal direction.

From the first row of heat exchange tubes to the last row of heat exchange tubes, the diameters of the air collecting pipes and the air-introducing straight pipes gradually increase from small to large.

Fins are installed on each of the heat exchange tubes.

The following takes a tube evaporator with six rows of heat exchange tubes as an example to describe in detail.

The schematic diagram of the intermediate induction tube evaporator with six rows of heat exchange tubes is shown in Figure 1-Figure 4, including the first heat exchange tube 8-1, the second heat exchange tube 8-2, the third heat exchange tube 8- 3. The fourth heat exchange tube 8-4, the fifth heat exchange tube 8-5, the sixth heat exchange tube 8-6, one end of the first heat exchange tube 8-1 in the first row is connected to the liquid pipe 10, and the other The end on the same side as the second heat exchange tube 8-2 in the middle row is connected through the first branch pipe 2-1, wherein the first heat exchange tube 8-1 is used as the outlet end of the refrigerant along the first branch pipe 2-1. 1 is inserted tangentially, the end of the second heat exchange tube 8-2 located in the first branch pipe 2-1 as the refrigerant inlet end is connected with a first liquid baffle plate 12-5, and the second heat exchange tube 8-2 The other end of the tube 8-2 is connected to the end on the same side as the third heat exchange tube 8-3 through the second branch pipe 2-2, and the end of the second heat exchange tube 8-2 as the outlet of the refrigerant flows along the second branch flow. The pipe 2-2 is inserted tangentially, and the end of the third heat exchange pipe 8-3 located in the second branch pipe 2-2 as the refrigerant inlet is connected with a second liquid baffle plate 12-4. The other end of the third heat exchange tube 8-3 is connected to the end on the same side of the fourth heat exchange tube 8-4 through the third branch tube 2-3, wherein the third heat exchange tube 8-3 is used as the outlet end of the refrigerant It is inserted tangentially along the third branch pipe 2-3, the fourth heat exchange tube 8-4 is located in the third branch pipe, and one end of the refrigerant inlet port is connected to the third liquid baffle plate 12-3, and the fourth heat exchange tube 8-4 4 The other end is connected to the same side end of the fifth heat exchange tube through the fourth distribution tube 2-4, wherein the fourth heat exchange tube 8-4 is inserted into the fourth liquid distribution tube 2-4 along the tangential direction as one end of the outlet end of the refrigerant , one end of the fifth heat exchange tube 8-5 used as the refrigerant inlet port is connected to the fourth liquid baffle plate 12-2, and the other end of the fifth heat exchange tube 8-5 passes through the same side end of the sixth heat exchange tube 8-6 The fifth branch pipe 2-5 is connected, the fifth heat exchange tube 8-5 is inserted into the fifth branch pipe 2-5 along the tangential direction as one end of the refrigerant outlet end, and the sixth heat exchange pipe 8-6 is connected as one end of the refrigerant inlet port There is a fifth liquid baffle plate 12-1, and the other end of the sixth heat exchange tube 8-6 is connected to an end collector 11 to form a refrigerant flow channel. On one side of the evaporator: the first liquid distribution pipe 2-1 communicates with the first air collecting pipe 4-1 through the first air-introduction elbow 3-1, and the third liquid distribution pipe 2-3 passes through the third air-induction elbow 3-3 communicates with the third air collecting pipe 4-3, and the fifth liquid pipe 2-5 communicates with the fifth air collecting pipe 4-5 through the fifth bleed air elbow 3-5, and the first air collecting pipe 4-1 It communicates with the third air collecting pipe 4-3 through the first bleed air straight pipe 6-1, and communicates between the third air collecting pipe 4-3 and the fifth air collecting pipe 4-5 through the third air bleed straight pipe 6-3 , the fifth air collecting pipe 4-5 communicates with the return air main pipe 1 through the first air-leading pipe 7-1 as the air collecting pipe at the end of one side. On the other side of the evaporator: the second shunt pipe 2-2 communicates with the second air collecting pipe 4-2 through the second bleed pipe 3-2, and the fourth liquid pipe 2-4 passes through the fourth bleed pipe 3-4 communicates with the fourth air collecting pipe 4-4, and the fourth air collecting pipe 4-4 communicates with the return air main pipe 1 through the second air induction pipe 7-2 as the air collecting pipe at the end of the other side. The refrigerant outlet end of the sixth heat exchange tube 8-6 in the last row can be directly connected to the return air main pipe 1 through the terminal collecting pipe 5, or connected to the second air induction pipe 7-2 through the terminal collecting pipe 5, and through the Two bleed air pipes 7-2 are indirectly connected with the air return main pipe 1. On one side of the evaporator: the diameters of the first air collecting pipe 4-1, the third air collecting pipe 4-3 and the fifth air collecting pipe 4-5 increase successively, the first air bleed straight pipe 6-1, the third air bleed straight pipe The diameters of the pipe 6-3 and the first bleed pipe 7-1 increase sequentially. On the other side of the evaporator: the diameters of the second bleed pipe 4-2 and the fourth bleed pipe 4-4 increase sequentially, and the second bleed air directly The diameters of the pipe 6-2 and the second air-leading pipe 7-2 increase sequentially. In the first heat exchange tube 8-1, the second heat exchange tube 8-2, the third heat exchange tube 8-3, the fourth heat exchange tube 8-4, the fifth heat exchange tube 8-5, the sixth heat exchange tube Fins 9 are respectively installed on the tubes 8-6. The first liquid baffle 12-5 is welded to the bottom of the insertion end of the second heat exchange tube 8-2, and welded to the inner wall of the first shunt tube 2-1, the second liquid baffle 12-4 is welded to the third heat exchange tube 8 -3 The bottom of the insertion end is welded and welded to the inner wall of the second shunt pipe 2-2, the third liquid baffle plate 12-3 is welded to the bottom of the insertion end of the fourth heat exchange tube 8-4, and is welded to the third shunt pipe 2-2 The inner wall of 3 is welded, the fourth liquid baffle 12-2 is welded to the bottom of the insertion end of the fifth heat exchange tube 8-5, and is welded to the inner wall of the fourth shunt tube 2-4, the fifth liquid baffle 12-1 is welded to the fifth heat exchange tube 8-5 The bottom of the insertion end of the six heat exchange tubes 8-6 is welded and welded to the inner wall of the fifth shunt tube 2-5.

In the refrigeration system, the liquid distribution pipe 10 is connected with the outlet of the thermal expansion valve of the refrigeration system, and the air return main pipe 1 is connected with the intake pipe of the refrigeration compressor. The low-temperature and low-pressure refrigerant liquid after interception and depressurization enters the channel of the first heat exchange tube 8-1 through the liquid distribution pipe 10, absorbs heat and evaporates, and flows into the first branch pipe 2-1 tangentially. Rotating flow in 2-1, the gas and liquid of different densities are separated, the gas rises from the first bleed elbow 3-1 to the first gas collecting pipe 4-1, and the liquid flowing along the inner wall of the first branch pipe 2-1 passes through the The first liquid baffle plate 12-5 collects and flows into the channel of the second heat exchange tube 8-2, absorbs heat and evaporates, flows into the second branch pipe 2-2 tangentially, and rotates and flows in the second branch pipe 2-2, different The density of gas and liquid is separated, the gas rises from the second bleed pipe 3-2 to the second gas collecting pipe 4-2, and the liquid flowing along the inner wall of the second branch pipe 2-2 passes through the second liquid baffle 12-4 Converge and flow into the channel of the third heat exchange tube 8-3, absorb heat and evaporate, flow tangentially into the third branch pipe 2-3, and rotate and flow in the third branch pipe 2-3, the gas and liquid of different densities are separated, and the gas The liquid that rises from the third air-introducing elbow 3-3 to the third air collecting pipe 4-3, flows along the inner wall of the third branch pipe 2-3, and flows into the fourth heat exchange tube 8 through the third liquid baffle plate 12-3 In the channel of -4, heat is absorbed and evaporated, tangentially flows into the fourth branch pipe 2-4, rotates and flows in the third branch pipe 2-4, the gas and liquid of different densities are separated, and the gas rises from the fourth air induction elbow 3-4 flows to the fourth gas collecting pipe 4-4, and the liquid flowing along the inner wall of the fourth branch pipe 2-4 is collected by the fourth liquid baffle plate 12-2 and flows into the channel of the fifth heat exchange pipe 8-5 to absorb heat Evaporate, tangentially flow into the fifth branch pipe 2-5, rotate and flow in the fifth branch pipe 2-5, the gas and liquid of different densities are separated, and the gas rises and flows from the fifth air induction elbow 3-5 to the fifth gas collecting pipe 4-5, the liquid flowing along the inner wall of the fifth distribution pipe 2-5 is collected by the fifth liquid baffle plate 12-1 and flows into the channel of the sixth heat exchange pipe 8-6, and flows into the end air induction pipe 5 after absorbing heat and evaporating. The gas from the second shunt pipe 2-2 enters the second gas collecting pipe 4-2, enters the fourth gas collecting pipe 4-4 through the second bleed air straight pipe 6-2, and mixes with the gas from the fourth shunting pipe 2-4 After that, it enters the air return main pipe 1 through the second bleed air pipe 7-2. The gas from the first branch pipe 2-1 enters the first gas collecting pipe 4-1, passes through the first bleed air straight pipe 6-1 and enters the third gas collecting pipe 4-3, and the gas from the third branch pipe 2-3 Mixing, enter the fifth air collecting pipe 4-5 through the third bleed air straight pipe 6-3, after mixing with the gas from the fifth shunt pipe 2-5, enter the return air main pipe 1 through the first bleed air pipe 7-1. After the refrigerant in the sixth heat exchange tube 8-6 is completely vaporized, it enters the return air main pipe 1 through the end air collector 11 and the end air induction pipe 5, or, through the end air collection pipe 11 and the end air induction pipe 5 and the second air induction pipe 7- 2, and enter the return air main pipe 1 through the second bleed air pipe 7-2.

The low-temperature and low-pressure refrigerant liquid flows in the heat exchange tube, absorbs the heat of the air flowing outside the tube, and provides a cold source for the cold space.

The finned tube type evaporator with air in the middle of the present invention, absorbs heat and evaporates the boiling refrigerant gas in the heat exchange tube, and after being separated by each shunt tube, draws it out from each air intake elbow to reduce the gas flowing into the heat exchange tube bundle at the back content, keep the high liquid wetting flow in the tube, increase the wettability of the liquid in the heat exchange tube, strengthen the heat transfer effect of the evaporator, and improve the operating performance of the refrigeration system.

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 (7)

1. A tubular evaporator with air in the middle, comprising multiple rows of heat exchange tubes, characterized in that one end of the heat exchange tubes in the first row is connected to the liquid pipe, and the same ends of the heat exchange tubes in the adjacent rows One end corresponding to the side is respectively connected by a closed shunt pipe, and each shunt pipe is connected with an air-inducing elbow, and each of the air-introducing elbows is respectively connected with the air collecting pipe, and the adjacent air collecting pipe on the same side The refrigerant outlet ends of the heat exchange tubes in the last row are directly or indirectly connected to the return air main pipe; the most extreme air collecting pipe is connected with the return air main pipe through the air induction pipe; The refrigerant gas that absorbs heat, evaporates and boils in the heat exchange tubes is separated by each branch pipe, and then is drawn out from each air induction elbow, and flows into the return air main pipe through the air collection pipe, air induction straight pipe and air induction pipe. 2 . The tubular evaporator with intermediate bleed air according to claim 1 , wherein a liquid baffle is respectively provided at the refrigerant inlet end of each of the heat exchange tubes. 3 . 3 . The tube evaporator with intermediate bleed air according to claim 1 or 2 , wherein the refrigerant outlet end corresponding to each of the heat exchange tubes is respectively inserted into the distribution tube tangentially. 4 . 4. The tube-type evaporator with intermediate bleed air according to claim 2, wherein one side of the liquid baffle is respectively connected to the bottom of the refrigerant inlet end and the bottom of each of the heat exchange tubes along the length direction. The inner wall of the shunt pipe is welded, and one side is inclined upward. 5 . The tube evaporator with intermediate bleed air according to claim 3 , wherein each of the branch pipes and air collecting pipes is arranged along the horizontal direction. 6 . 6. The tubular evaporator with intermediate bleed air according to claim 3, characterized in that the diameters of the gas collectors and bleed air straight pipes between the first row of heat exchange tubes and the last row of heat exchange tubes are from small to large Gradually increase. 7 . The tube evaporator with intermediate bleed air according to claim 3 , wherein fins are installed on each of the heat exchange tubes.