CN105352345B - Microchannel heat exchanger and air conditioner thereof - Google Patents

Abstract

The invention discloses a micro-channel heat exchanger and an air conditioner thereof, wherein the micro-channel heat exchanger comprises a first liquid collecting pipe and a second liquid collecting pipe which are arranged side by side, and a plurality of flat pipes extending from the first liquid collecting pipe to the second liquid collecting pipe, at least one water spraying channel and a plurality of refrigerant channels are arranged in each flat pipe, each flat pipe is provided with a water spraying hole which is communicated with the water spraying channel and is arranged towards the adjacent flat pipe, the plurality of refrigerant channels are communicated with the first liquid collecting pipe and the second liquid collecting pipe, the first liquid collecting pipe or the second liquid collecting pipe is provided with a refrigerant inlet and a refrigerant outlet, a water cavity communicated with the water spraying channels of the flat pipes and a refrigerant cavity arranged at intervals with the water cavity are arranged in the second liquid collecting pipe, and the second liquid collecting pipe is provided with a water inlet communicated with the water cavity. According to the technical scheme, combined heat dissipation combining air cooling and water cooling is realized, and the heat exchange efficiency of the heat exchanger is improved.

Description

Microchannel heat exchanger and its air conditioner

technical field

The invention relates to the technical field of air conditioning, in particular to a microchannel heat exchanger and an air conditioner thereof.

Background technique

The microchannel heat exchanger is mainly composed of two cylindrical liquid collectors, flat tubes, fins, reinforcing plates and fixing blocks. The flat tube is installed between the left and right liquid collection pipes, and the left and right liquid collection pipes communicate with the microchannels through the microchannels inside the flat pipes to form a closed space. The fins are fixed between the flat pipes and the flat pipes. It becomes N cooling units with the microchannel, which is responsible for transferring the heat of the fluid inside the microchannel to the air.

The microchannel heat exchanger installed in the existing air conditioner has a single heat dissipation method. If the temperature is high in summer, the air conditioner will frequently trip protection in a high temperature environment, which is likely to cause customer complaints. In addition, due to the close pitch of the fins, the air passage resistance is large, so the wind speed on the windward side of the heat exchanger is greater than that on the leeward side. However, the unit heat transfer coefficient of the windward side and the leeward side of the heat exchanger is the same as the heat transfer area, and the wind speed on the leeward side is low, and the unit heat dissipated in this area is smaller than that of the windward side, which makes the temperature of the leeward side of the existing microchannel heat exchanger High, while the windward side has good heat dissipation and low temperature, which affects the heat dissipation efficiency of the heat exchanger.

Contents of the invention

The main purpose of the present invention is to provide a micro-channel heat exchanger and an air conditioner thereof, aiming at realizing water-cooled and air-cooled compound heat dissipation and improving the heat exchange efficiency of the heat exchanger.

In order to achieve the above object, the present invention proposes a microchannel heat exchanger, comprising a first liquid collector and a second liquid collector arranged side by side, and a pipe extending from the first liquid collector to the second liquid collector. A plurality of flat tubes, at least one water spray channel and a plurality of refrigerant channels are arranged inside each flat tube, and each flat tube is provided with a water spray hole that communicates with the water spray channel and is arranged toward the adjacent flat tube. A plurality of refrigerant passages communicate with the first liquid collection pipe and the second liquid collection pipe, the first liquid collection pipe or the second liquid collection pipe is provided with a refrigerant inlet and a refrigerant outlet, and the second liquid collection pipe is provided with There are water chambers communicating with the water spray channels of the plurality of flat tubes, and a refrigerant chamber spaced apart from the water chambers, and the second liquid collecting pipe is provided with a water inlet communicating with the water chambers.

Preferably, the water spray channel and the plurality of refrigerant channels on the same flat tube are sequentially arranged in at least one row along the direction from the windward side to the leeward side.

Preferably, the water spray holes are arranged obliquely toward the wind outlet side from the inside of the water spray channel.

Preferably, the thickness of each flat tube is set to gradually decrease from the windward side to the leeward side; in each flat tube, the cross-sectional area of the plurality of refrigerant passages increases from the windward side to the leeward side. In the direction of the side, set the settings in descending order.

Preferably, the first liquid collection pipe and the second liquid collection pipe are arranged vertically, the plurality of flat pipes are arranged horizontally, the water spray holes are arranged at the bottom of each flat pipe, and each The bottom surface of the flat tubes is arranged horizontally, and the top surface of each flat tube is arranged inclined downward in the direction from the windward side to the leeward side.

Preferably, at one end of each flat tube connected to the first liquid collection pipe, one end of the plurality of refrigerant passages protrudes from the end of the water spray passage, so as to be connected with the first liquid collection pipe. The first refrigerant channel socket of the pipe is plugged in; one end of each flat tube connected to the second liquid collection pipe is provided with a gap, and the gap is located between the other end of the plurality of refrigerant channels and the water spray channel. Between the other ends of the plurality of refrigerant passages, the other end of the plurality of refrigerant passages is plugged into the second refrigerant passage socket provided in the second liquid collection pipe, and the other end of the water spray passage is connected to the second liquid collection pipe. The spray pipe jack of the pipe is plugged in.

Preferably, the first liquid collection pipe and the second liquid collection pipe are arranged vertically, the plurality of flat pipes are arranged to extend laterally, a first separator is arranged in the first liquid collection pipe, and the The first partition divides the refrigerant chamber of the first liquid collecting pipe up and down into a plurality of first compartments, and a second partition is arranged in the second liquid collecting pipe, and the second partition divides the second The refrigerant cavity of the liquid collecting pipe is divided up and down into a plurality of second compartments, and the first partition and the second partition are staggered vertically.

Preferably, the first liquid collection pipe and the second liquid collection pipe are arranged vertically, the plurality of flat pipes are arranged to extend laterally, a first separator is arranged in the first liquid collection pipe, and the The first partition divides the refrigerant chamber of the first liquid collecting pipe up and down into a plurality of first compartments, and a second partition is arranged in the second liquid collecting pipe, and the second partition divides the second The refrigerant cavity of the liquid collecting pipe is divided up and down into a plurality of second compartments, and the first partition and the second partition are staggered vertically.

Preferably, the plurality of flat tubes, the first liquid collecting pipe, the second liquid collecting pipe and the finned pipes are all made of aluminum material.

The present invention also proposes an air conditioner, including a microchannel heat exchanger, a temperature sensor, a solenoid valve and a controller:

The microchannel heat exchanger includes a first header and a second header arranged side by side, and a plurality of flat tubes extending from the first header to the second header, each flat tube At least one water spray passage and a plurality of refrigerant passages are arranged inside, each flat tube is provided with a water spray hole which communicates with the water spray passage and is arranged towards the adjacent flat pipe, and the plurality of refrigerant passages are connected with the first The liquid collection pipe is connected with the second liquid collection pipe, and the first liquid collection pipe or the second liquid collection pipe is provided with a refrigerant inlet and a refrigerant outlet, and the second liquid collection pipe is provided with the plurality of flat pipes. A water cavity connected to the water spray channel, and a refrigerant cavity spaced apart from the water cavity, and the second liquid collecting pipe is provided with a water inlet connected to the water cavity;

The temperature sensor is arranged adjacent to the refrigerant outlet to detect the temperature of the refrigerant at the refrigerant outlet of the microchannel heat exchanger;

The solenoid valve is arranged on the pipeline between the water inlet and the water source;

The controller is electrically connected with the solenoid valve and the temperature sensor, and is used to control the conduction of the solenoid valve when the refrigerant temperature at the refrigerant outlet of the micro-channel heat exchanger is higher than a safe temperature.

The technical scheme of the present invention is provided with a water cavity on the second liquid collecting pipe, and a water spray channel connected with the water cavity is set on the flat tube, and the water spray hole of the water spray channel can spray water to the adjacent flat tubes. Water spray cooling, combined with air-cooling heat dissipation, realizes the combined heat dissipation of air-cooling and water-cooling, improves the heat exchange efficiency of the heat exchanger, and can effectively prevent the frequent shutdown of the air conditioner in high-temperature environments.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is the structural representation of an embodiment of the microchannel heat exchanger provided by the present invention;

Fig. 2 is a schematic cross-sectional view of the microchannel heat exchanger shown in Fig. 1;

Fig. 3 is a top view schematic diagram of the microchannel heat exchanger shown in Fig. 1;

Fig. 4 is the schematic side view of the first header of the microchannel heat exchanger shown in Fig. 1;

Fig. 5 is the three-dimensional schematic view of the first header of the microchannel heat exchanger shown in Fig. 1;

Fig. 6 is the schematic cross-sectional view of the first header of the microchannel heat exchanger shown in Fig. 1;

Fig. 7 is a schematic side view of the second header of the microchannel heat exchanger shown in Fig. 1;

Fig. 8 is the three-dimensional schematic view of the second header of the microchannel heat exchanger shown in Fig. 1;

Fig. 9 is a schematic cross-sectional view of the second header of the microchannel heat exchanger shown in Fig. 1;

Figure 10 is a schematic diagram of the combination of flat tubes and fins of the microchannel heat exchanger shown in Figure 1;

Fig. 11 is the three-dimensional schematic view of the flat tube of the microchannel heat exchanger shown in Fig. 1;

Fig. 12 is the front schematic view of the flat tube of the microchannel heat exchanger shown in Fig. 1;

Fig. 13 is a schematic diagram of the three-dimensional structure of the liquid collecting pipe end cover of the microchannel heat exchanger shown in Fig. 1;

Fig. 14 is a schematic diagram of the three-dimensional structure of the water pipe end cover of the microchannel heat exchanger shown in Fig. 1;

Fig. 15 is a schematic frame diagram of the control part of an embodiment of the air conditioner of the present invention.

Explanation of reference numbers:

label name label name 100 microchannel heat exchanger 130 flat tube 110 first header 130a blowhole 111 The first refrigerant channel socket 131 sprinkler channel 112 first partition 132 Refrigerant channel 113 first compartment 133 gap 120 Second header 140 fins 120a water cavity 151 Reinforcing plate 120b Refrigerant cavity 152 Fixed block 121a Refrigerant input pipe 161 Collector end cap 121b Refrigerant output pipe 1611 header extension 121c water inlet 162 Water pipe end cap 122a Spray channel connection hole 1621 water pipe extension 122b The second refrigerant channel jack 101 Temperature Sensor 123 second partition 102 The electromagnetic valve 124 second compartment 103 controller

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, the descriptions involving "first", "second" and so on in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The invention provides a microchannel heat exchanger.

Fig. 1 is a schematic structural view of an embodiment of the microchannel heat exchanger provided by the present invention; Fig. 2 is a schematic cross-sectional view of the microchannel heat exchanger shown in Fig. 1; Fig. 3 is a top view of the microchannel heat exchanger shown in Fig. 1 Schematic diagram; Figure 4 is a schematic side view of the first header of the microchannel heat exchanger shown in Figure 1; Figure 5 is a perspective view of the first header of the microchannel heat exchanger shown in Figure 1; Figure 6 is The schematic cross-sectional view of the first header of the microchannel heat exchanger shown in Figure 1; Figure 7 is a schematic side view of the second header of the microchannel heat exchanger shown in Figure 1; Figure 8 is shown in Figure 1 The three-dimensional schematic view of the second header of the microchannel heat exchanger; Figure 9 is a schematic cross-sectional view of the second header of the microchannel heat exchanger shown in Figure 1; Figure 10 is the microchannel heat exchanger shown in Figure 1 Figure 11 is a perspective view of the flat tube of the microchannel heat exchanger shown in Figure 1; Figure 12 is a front schematic view of the flat tube of the microchannel heat exchanger shown in Figure 1; Figure 13 It is a schematic diagram of the three-dimensional structure of the liquid collecting pipe end cover of the microchannel heat exchanger shown in FIG. 1; FIG. 14 is a schematic diagram of the three-dimensional structure of the water pipe end cover of the microchannel heat exchanger shown in FIG.

Please refer to Fig. 1 to Fig. 3, and Fig. 9 to Fig. 10, the microchannel heat exchanger 100 comprises a first liquid collecting pipe 110, a second liquid collecting pipe 120 and a flat tube 130, and the flat pipe 130 is arranged on the first liquid collecting pipe Between the pipe 110 and the second liquid collecting pipe 120, there are a water spray channel 131, a refrigerant channel 132, and a water spray hole 130a communicating with the water spray channel 131 and facing outward. Both ends of the refrigerant channel 132 are respectively connected to the first liquid collecting pipe 110 and the second liquid collecting pipe 120, and the first liquid collecting pipe 110 or the second liquid collecting pipe 120 is provided with a refrigerant inlet and a refrigerant outlet, and the second liquid collecting pipe 120 A water chamber 120a communicating with the water spray channel 131 of the flat tube 130 and a refrigerant chamber 120b spaced apart from the water chamber are provided inside. The second liquid collecting pipe 120 is provided with a water inlet 121c communicating with the water chamber 120a. In an embodiment of the present invention, the microchannel heat exchange 100 includes a first liquid collection pipe 110 and a second liquid collection pipe 120 arranged side by side, and a pipe extending from the first liquid collection pipe 110 to the second liquid collection pipe 120 A plurality of flat tubes 130, each flat tube 130 is provided with at least one water spray channel 131 and a plurality of refrigerant channels 132, each flat tube 130 is provided with the water spray channel 131, and is directed toward the adjacent flat tube 130 The water spray holes 130a are provided, the plurality of refrigerant passages 132 communicate with the first liquid collection pipe 110 and the second liquid collection pipe 120, and the first liquid collection pipe 110 or the second liquid collection pipe 120 is provided with A refrigerant inlet (the refrigerant inlet is connected to the refrigerant input pipe 121 a ) and a refrigerant outlet (the refrigerant outlet is connected to the refrigerant output pipe 121 b ).

The technical scheme of the present invention is provided with a water chamber 120a on the second liquid collecting pipe 120, and a water spray channel 131 communicated with the water chamber 120a is provided on the flat tube 130, and the water spray hole 130a of the water spray channel 131 can pass through to Water is sprayed from the outside to cool down the adjacent flat tubes 130 (especially the adjacent flat tubes 130 facing the water spray hole 130a), combined with air cooling and heat dissipation, the combined heat dissipation of air cooling and water cooling is realized, and the heat transfer is improved. The heat exchange efficiency of the air conditioner can effectively prevent the frequent shutdown of the air conditioner in a high temperature environment.

Usually, in order to increase the heat dissipation area of the microchannel heat exchanger, please refer to Fig. 10, fins 140 are arranged between two adjacent flat tubes 130, it can be seen that the plurality of fins 140 are arranged in parallel and at intervals. The side air flows through the gaps between the fins 140 to exchange heat with the fins 140 .

It should be noted that: in the present invention, the positions of the first liquid collecting pipe 110 and the second liquid collecting pipe 120 can be interchanged, and correspondingly, the first liquid collecting pipe 110 can be provided with a The water spray channel 131 of the plurality of flat tubes 130 is connected to the water chamber 120a and the refrigerant chamber 120b spaced apart from the water chamber 120a, the first liquid collecting pipe 110 is provided with a water chamber 120a connected water inlet.

In the present invention, the refrigerant inlet and refrigerant outlet can be set at the first liquid header 110 according to the performance requirements or structural design requirements of the microchannel heat exchanger, or the refrigerant inlet and refrigerant outlet can be set at The second liquid collecting pipe 120 , or, the refrigerant inlet and the refrigerant outlet are respectively opened in the first liquid collecting pipe 110 and the second liquid collecting pipe 120 .

The following structure is specific to the drawings, introducing the connection mode between the flat tube 130 and the first liquid collecting pipe 110 and the second liquid collecting pipe 120:

Please refer to FIG. 1 and FIG. 4 to FIG. 5 , where the first liquid collecting pipe 110 and the plurality of flat tubes 130 are connected with a plurality of first refrigerant channel insertion holes 111 . Referring to FIG. 1 and FIG. 7 to FIG. 8 , a plurality of water spray channel insertion holes 122a and a plurality of second refrigerant channel insertion holes 122b are disposed at the junction of the second liquid collecting pipe 120 and the plurality of flat tubes 130 .

Please refer to FIG. 1 and FIG. 4 to FIG. 9. In this embodiment, at one end of each flat tube 130 connected to the first liquid collecting pipe 120, one end of the plurality of refrigerant passages 132 protrudes from the One end of the water spray channel 131 is configured to be inserted into the first refrigerant channel socket 111 provided in the first liquid collecting pipe 120 . One end of each flat tube 130 connected to the second liquid collecting pipe 120 is provided with a notch 133 , and the notch 133 is located between the other end of the plurality of refrigerant channels 132 and the other end of the water spray channel 131 , the other end of the plurality of refrigerant channels 132 is plugged into the second refrigerant channel socket 122b provided in the second liquid collecting pipe 120, and the other end of the water spraying channel 131 is connected to the second liquid collecting pipe 120 of the water spray channel jack 122a plug. The plurality of flat tubes 130 and the first liquid collecting pipe 110 , the second liquid collecting pipe 120 and between the fins 140 and the corresponding flat tubes 130 are also fixed by brazing.

And further, in order to enhance the connection strength between the plurality of flat tubes 130 and the first liquid collecting pipe 110 and the second liquid collecting pipe 120, please refer to FIG. A reinforcement plate 151 , the two ends of the reinforcement plate 151 are respectively connected with the first liquid collection pipe 110 and the second liquid collection pipe 120 . Both ends of the reinforcing plate 151 are fixedly connected to the first liquid collecting pipe 110 and the second liquid collecting pipe 120 by brazing. The structural strength of the heat exchanger can be enhanced by arranging the solid reinforcing plate 151 to support and protect the flat tube 130 and the first liquid collecting pipe 110 and the second liquid collecting pipe 120 .

Please refer to FIG. 1 , the microchannel heat exchanger further includes a plurality of fixing blocks 152 , and the fixing blocks 152 are respectively connected to the first liquid collecting pipe 110 and the second liquid collecting pipe 120 . Preferably, four fixing blocks 152 are used, which are respectively fixed at the ends of the first liquid collecting pipe 110 and the second liquid collecting pipe 120 . The technical solution of the present invention provides four fixing blocks 152 to facilitate the installation and fixing of the microchannel heat exchanger. In other embodiments, the quantity, installation position and structural form of the fixing blocks 152 can be designed according to specific conditions.

The basic structure of the first liquid collecting pipe 110 and the second liquid collecting pipe 120 will be introduced below in conjunction with the specific drawings:

Please refer to Fig. 1 to Fig. 3, and Fig. 6 and Fig. 9, the first liquid collecting pipe 110 and the second liquid collecting pipe 120 are in the shape of a tube (usually a circular tube), and the two ends of the first liquid collecting pipe 110 Liquid collecting pipe end caps 161 are provided respectively, and both ends of the second water collecting pipe 120 are provided with the liquid collecting pipe end caps 161 and water pipe end caps 162 . The liquid collecting pipe end cover 161 has a liquid collecting pipe extension 1611 that can extend into the refrigerant cavity 120b of the corresponding first liquid collecting pipe 110 or the second liquid collecting pipe 120 and cooperate with it. The water pipe end cover 162 has a The water pipe extension 1621 protrudes into the water cavity 120a of the second liquid collecting pipe 120 and cooperates with it. In the embodiment of the present invention, by setting the above-mentioned extension structure, it is convenient to increase the contact surface between the end cover and the first liquid collecting pipe 110 and the second liquid collecting pipe 120, increase the welding area, make the sealing effect better, improve product safety, and prevent Excessive pressure causes micro-leakage at the weld.

In this embodiment, the first liquid collecting pipe 110 and the second liquid collecting pipe 120 are arranged vertically, the plurality of flat pipes 130 are arranged horizontally, and the first liquid collecting pipe 110 is arranged inside There is a first partition 112, and the first partition 112 divides the refrigerant cavity (not labeled) of the first liquid collecting pipe 110 into a plurality of first compartments 113 up and down, and the inside of the second liquid collecting pipe 120 A second partition 123 is provided, and the second partition 123 divides the refrigerant chamber 120b of the second liquid collecting pipe 120 up and down into a plurality of second compartments 124, and the first partition 112 and the first The two partitions 123 are staggered vertically so that the refrigerant forms a detour circuit in the refrigerant channel 132 to improve heat exchange efficiency.

Further, the refrigerant inlet and the refrigerant outlet are arranged on the second liquid collecting pipe 120, wherein the refrigerant inlet is arranged on the upper end of the second liquid collecting pipe 120, and is connected with the uppermost second liquid collecting pipe 120. The partition chambers 124 communicate with each other, and the refrigerant outlet is disposed at the lower end of the second liquid collecting pipe 120 and communicates with the lowermost second partition chamber 124 . The technical solution of the present invention sets the refrigerant inlet in the uppermost second partition chamber 124 of the second liquid collecting pipe 120 so that the refrigerant can be quickly and evenly divided into each refrigerant channel 132 after entering the second partition chamber 124 through the refrigerant inlet. Most of the refrigerant in the lowermost second compartment 124 has become liquid. Under the action of gravity, the refrigerant outlet is designed at the bottom of the refrigerant chamber, which is conducive to the rapid discharge of liquid refrigerant and reduces some refrigerant flow resistance.

The basic structure of the flat tube 130 is introduced below in conjunction with the specific drawings:

Please refer to Fig. 1 to Fig. 3, and Fig. 10 to Fig. 13, in this embodiment, the plurality of flat tubes 130, the first liquid collecting pipe 110, the second liquid collecting pipe 120 and the fins 140 are all made of aluminum material . The use of aluminum materials can reduce costs in terms of guarantees, because aluminum materials have good ductility, low melting point, and simple casting, so they can be mass-produced.

In this embodiment, the water spray channel 131 and the plurality of refrigerant channels 132 located on the same flat tube 130 are sequentially arranged in at least one row along the direction from the windward side to the leeward side (and specifically, in this embodiment, , the water spray channel 131 and the multiple refrigerant channels 132 on the same flat tube 130 are arranged in a row), the water spray channel 131 is close to the windward side, and the multiple refrigerant channels 132 are close to the wind outlet side.

In this embodiment, the thickness of each flat tube 130 is gradually reduced from the windward side to the leeward side, that is, the flat tubes 130 are wedge-shaped. In each of the flat tubes 130 , the cross-sectional areas of the plurality of refrigerant channels 132 are arranged in descending order from the windward side to the leeward side. The cross-sectional shape of the refrigerant channel 132 is circular (see FIG. 6 ) or polygonal or other shapes. When the cross-sectional shape of the refrigerant passage 132 is circular, in each flat tube 130, the cross-sectional area of the plurality of refrigerant passages 132 is expressed as a pipe diameter, and the pipe diameter of the plurality of refrigerant passages 132 is From the windward side to the leeward side, set them in descending order.

Because of the resistance of the fins 140 to the wind speed and the exchange and absorption between the cooling airflow and the heat of the fins 140, the windward side of the micro-channel radiator will have a higher wind speed than the leeward side, a larger relative temperature difference, and a better heat dissipation effect. Well, and the change is roughly linear. Therefore, the technical solution of the present invention sets the cross-sectional area (for example, aperture) of the plurality of refrigerant passages 132 on the flat tube 130 to gradually decrease from the windward side to the windward side, preferably linearly, so that this advantage can be fully utilized. The wind speed of the windward side of the microchannel heat exchanger is higher than that of the leeward side, and the relative temperature difference is large, which improves the heat exchange efficiency and makes the temperature of the windward side and the leeward side of the heat exchanger relatively balanced. In other embodiments, the cross-sectional area (eg aperture) of the refrigerant channel 132 may also decrease non-linearly according to the law of heat transfer.

Preferably, the water spray hole 130 a is arranged obliquely from the inside of the water spray channel 131 to the air outlet side, that is, inclined to the refrigerant channel 132 of the adjacent flat tube 130 .

The technical solution of the present invention is to set the water spray hole 130a from the inside of the water spray channel 131 to the outside, inclined to the direction of the air outlet, that is, to be inclined to the refrigerant channel 132 of the adjacent flat tube 130, so that the water spray channel 131 can spray The discharged water can be sprayed at an optimal angle, so that the sprayed water can cover the largest area of the flat tube 130, so as to facilitate water cooling and heat dissipation at high temperature, and improve the utilization efficiency of water. In other embodiments, the inclination angle of the water spray hole 130a is not limited, it is specifically determined according to the water pressure, the width of the adjacent flat tubes 130, and the distance between the two adjacent flat tubes 130, so as to ensure the best The optimum spraying angle is based on the maximum area that can cover the adjacent flat tubes 130 .

In this embodiment, the first liquid collecting pipe 110 and the second liquid collecting pipe 120 are arranged vertically, the plurality of flat pipes 130 are arranged horizontally, and the water spray holes 130a are arranged in each The bottom of the flat tube 130, the outlet of the water spray hole 130a can spray water downwards, the bottom surface of each flat tube 130 is horizontally arranged, and the top surface of each flat tube 130 is in the direction from the windward side to the leeward side. Tilt setting.

The technical scheme of the present invention sets the bottom surface horizontal and the top surface inclined to the bottom surface so that the water sprayed from the water spray channel 131 can flow down along the top surface and flow through the larger area of the top surface of the flat tube 130 as much as possible to further enhance heat dissipation. Effect.

The present invention also proposes an air conditioner, and Fig. 15 is a schematic frame diagram of the control part of an embodiment of the air conditioner of the present invention

Please refer to Fig. 15, the air conditioner includes a microchannel heat exchanger 100 (see Fig. 1 for details), a temperature sensor 101, a solenoid valve 102 and a controller 103, the specific structure of the microchannel heat exchanger 100 refers to the above-mentioned embodiment, because The air conditioner adopts all the technical solutions of the above-mentioned embodiments, so at least it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not repeat them here. Wherein, the temperature sensor 101 is arranged adjacent to the refrigerant outlet to detect the temperature of the refrigerant at the refrigerant outlet of the micro-channel heat exchanger 100 . The solenoid valve 102 is arranged on the pipeline between the water inlet and the water source, and the controller 103 is electrically connected with the solenoid valve 102 and the temperature sensor 101, and is used in the microchannel heat exchanger When the refrigerant temperature at the refrigerant outlet of 100 is higher than the safe temperature, the solenoid valve 102 is controlled to conduct. Wherein the water source has a certain pressure water source, such as tap water, or the indoor unit condenser combined with a water storage tank and a micro-water pump can also be realized, and the water consumption is small, and the safe temperature is set according to specific conditions.

For example, the safe temperature is 40 °, when the temperature sensed by the temperature sensor 101 is greater than 40 ° and lasts for 1 minute (in other embodiments, other safe temperature values set according to actual conditions can also be used), the solenoid valve 102 is controlled by the controller 103 to be energized and opened, otherwise (the induced temperature is lower than 40° C. for 1 minute), the solenoid valve 102 is de-energized and closed. In addition, the control circuit board can add a fast cooling program. When fast cooling is required, the user presses the fast cooling button, the solenoid valve and the compressor work at the same time, and the solenoid valve is set to work for 2 minutes. After the power is turned off, the compressor is still running normally, which can realize Fast cooling.

The technical solution of the present invention can implement intelligent temperature control protection by setting a solenoid valve 102, a controller 103 and a temperature sensor 101 adjacent to the outlet of the refrigerant, enhance the composite heat dissipation function of the air conditioner, improve heat dissipation efficiency, and effectively Ensure that the air conditioner can still work normally in high temperature environment without frequent shutdown.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of micro-channel heat exchanger, it is characterised in that including the first collector tube and the second collector tube and multiple be arranged on institute The flat tube between the first collector tube and second collector tube is stated, the inside of each flat tube sets at least one water spray passage and multiple Refrigerant passage, each flat tube is communicated with the water spray passage and the hole for water spraying set towards neighbouring flat tube, and the refrigerant leads to Road is connected with first collector tube and the second collector tube, first collector tube or the second collector tube provided with refrigerant inlet and Be provided with refrigerant exit, second collector tube water cavity that is connected with the water spray passage of the flat tube and with the water The spaced refrigerant chamber of chamber, second collector tube is communicated with the water inlet of the water cavity.

2. micro-channel heat exchanger as claimed in claim 1, it is characterised in that first collector tube and the second liquid collecting tube side-by-side Set, multiple flat tubes extend from first collector tube to the second collector tube, and the outlet of the hole for water spraying is downward.

3. micro-channel heat exchanger as claimed in claim 2, it is characterised in that water spray passage on same flat tube and multiple Refrigerant passage, along windward side to the direction of leeward side, is arranged into an at least row successively.

4. micro-channel heat exchanger as claimed in claim 3, it is characterised in that the hole for water spraying from the water spray passage to Outside, it is obliquely installed to air side direction.

5. micro-channel heat exchanger as claimed in claim 3, it is characterised in that the thickness of each flat tube is from windward side to leeward On the direction of side, in being gradually reduced setting；In each flat tube, the cross-sectional area of the multiple refrigerant passage, from windward side To on the direction of leeward side, setting of successively decreasing successively.

6. the micro-channel heat exchanger as described in claim 1-5 any one, it is characterised in that first collector tube and described Second collector tube is in vertically arranged, and the flat tube is in setting is extended laterally, and the hole for water spraying is located at the bottom of the flat tube, described The bottom surface of flat tube is horizontally disposed with, and the top surface of the flat tube is on from windward side to the direction of leeward side, in tilting down setting.

7. micro-channel heat exchanger as claimed in claim 1, it is characterised in that be connected in the flat tube with first collector tube Place the refrigerant passage residing for part relative to it is described water spray passage residing for part it is outstanding set, with located at institute State the first refrigerant passage jack grafting of the first collector tube；The other end of the multiple refrigerant passage is with being located at second liquid collecting Second refrigerant passage jack grafting of pipe, the water pipeline jack of the other end of the water spray passage and second collector tube is inserted Connect.

8. micro-channel heat exchanger as claimed in claim 1, it is characterised in that first collector tube and second collector tube In vertically arranged, the flat tube is provided with the first dividing plate, first dividing plate in extending laterally in setting, first collector tube To be divided into above and below the refrigerant chamber of first collector tube in multiple first compartments, second collector tube be provided with second every Plate, the second partition will be divided into multiple second compartments, first dividing plate above and below the refrigerant chamber of second collector tube Mutually stagger in above-below direction with the second partition.

9. micro-channel heat exchanger as claimed in claim 8, it is characterised in that the refrigerant inlet and the refrigerant exit are located at On second collector tube, wherein, the refrigerant inlet is arranged on the upper end of second collector tube, and with the second of the top Compartment is connected, and the refrigerant exit is arranged on the lower end of second collector tube, and is connected with the second compartment of bottom.

10. a kind of air conditioner, it is characterised in that including the micro-channel heat exchanger described in claim 1-9 any one, the sky Device is adjusted also to include temperature sensor, magnetic valve and controller：

The temperature sensor is set adjacent to the refrigerant exit, at the refrigerant exit to detect the micro-channel heat exchanger Refrigerant temperature；

The magnetic valve is on the pipeline between the water inlet and water source；

The controller is electrically connected with the magnetic valve and the temperature sensor, in the micro-channel heat exchanger When refrigerant temperature at refrigerant exit is more than safe temperature, the solenoid valve conduction is controlled.