Microchannel evaporator adapted to flow and control method thereof

Abstract

The application belongs to the field of refrigeration technology and equipment, and particularly relates to a micro-channel evaporator matched with flow and a control method thereof. The micro-channel evaporator matched with flow comprises an inlet inner distribution device, a micro-channel flat tube row, an outlet header, an outlet pipe and an inlet pipe. The two ends of the micro-channel flat tube row are connected with the inlet inner distribution device and the outlet header respectively. The gas-liquid two-phase working medium enters from the inlet pipe, is uniformly distributed through the inner distribution device, flows into the micro-channel flat tube row for evaporation, and finally flows out through the outlet header and the outlet pipe. The rotating part in the application rotates around the central rotating shaft. When a distribution pipe of the rotating part coincides with the through hole of the distribution cavity, the refrigerant enters the corresponding distribution pipe and enters the corresponding distribution cavity area to realize distribution. When the distribution pipe coinciding with the through hole of the distribution cavity is switched, the size and the number of the opening of the distribution pipe and the size of the distribution cavity are changed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of refrigeration technology and equipment, and particularly relates to a micro-channel evaporator matched with flow and a control method thereof. BACKGROUND

[0002] At the inlet of the evaporator, the working medium is in a gas-liquid two-phase state, the flow pattern and flow state are complex and unstable, and it is difficult to achieve flow matching, which can cause the outlet of some evaporator branches to be overheated and some branches to carry liquid, and it is difficult to exert the maximum potential of the heat exchanger. Therefore, how to match the working medium is a major technical problem in the application of the evaporator.

[0003] The micro-channel heat exchanger is a heat exchanger with a channel equivalent diameter of 10-1000 μm, and is a high-efficiency heat exchanger. The flat tube of the heat exchanger has a plurality of fine flow channels, and the two ends of the flat tube are connected with circular header pipes to collect and distribute the refrigerant.

[0004] In order to ensure the uniform distribution of two-phase refrigerant in the header pipe of the micro-channel heat exchanger to each branch and achieve the uniform distribution of the refrigerant in the header pipe, a distribution pipe is usually inserted into the header pipe. Small holes are opened on the wall of the distribution pipe, and a partition plate is inserted outside the distribution pipe. The partition plate divides the space between the header pipe and the distribution pipe into a small chamber. Two-phase refrigerant first flows into the distribution pipe, accelerates in the distribution pipe, enters the header pipe chamber through the small holes on the pipe wall, and enters the flat tube inserted thereon.

[0005] In actual use, the heat exchanger needs to operate under different conditions and different flow rates. The size of the existing micro-channel heat exchanger chamber and distribution pipe is fixed, and cannot meet the optimal distribution under different refrigerant flow rates. SUMMARY

[0006] The present application provides a micro-channel evaporator matched with flow and a control method thereof. The micro-channel heat exchanger header distribution structure can change the size of the chamber and the distribution pipe under different flow rates, and is used to solve the matching problem of the size of the chamber and the distribution pipe of the micro-channel heat exchanger with different flow rates, and can be applied to the micro-channel evaporator with horizontally placed header pipes.

[0007] The technical scheme for solving the above problems is as follows: a micro-channel evaporator matched with flow, which is characterized in that:

[0008] The micro-channel evaporator comprises an inlet inner distribution device, a micro-channel flat tube row, an outlet header pipe, an outlet pipe and an inlet pipe. The two ends of the micro-channel flat tube row are connected with the inlet inner distribution device and the outlet header pipe, respectively. The gas-liquid two-phase working medium enters from the inlet pipe, is evenly distributed by the inner distribution device, flows into the micro-channel flat tube row for evaporation, and finally flows out through the outlet header pipe and the outlet pipe.

[0009] The inlet inner flow dividing device comprises a distribution cavity and a rotating component;

[0010] The distribution cavity is divided into two regions, a cylindrical space and a semi-cylindrical space, which are in communication with each other, and the inner radius of the semi-cylindrical space is less than or equal to the inner radius of the cylindrical space;

[0011] One end of the cylindrical space is connected with the inlet pipe; the inner part of the cylindrical space is divided into two parts by a radial partition plate close to the inlet pipe, one part connected with the inlet pipe is the inlet pipe connecting region, and the other part is the distribution region; a fan-shaped through hole is formed on the radial partition plate close to the semi-cylindrical region, and a recessed channel is formed on the radial partition plate; a plurality of partition plates are embedded in the semi-cylindrical space, and the partition plates divide the semi-cylindrical space into multiple regions, and each region is provided with a plurality of flat pipe insertion ports;

[0012] The rotating component comprises a central rotating shaft, a plurality of radial partition plates, a plurality of axial partition plates, a bottom cylindrical platform structure, and a top cylindrical platform structure;

[0013] The central rotating shaft passes through the centers of the bottom cylindrical platform structure and the top cylindrical platform structure, and a plurality of axial partition plates are radially arranged around the axis of the central rotating shaft; the included angles of adjacent two axial partition plates are different; a plurality of radial partition plates are arranged between the bottom cylindrical platform structure and the top cylindrical platform structure, and pass through the axial partition plates to divide the space between adjacent two axial partition plates into multiple sections; a distribution pipe is arranged between adjacent two axial partition plates, passes through the radial partition plate, is sealed at the end close to the top cylindrical platform structure, and passes through the bottom cylindrical platform structure at the other end; the inner diameter of the distribution pipe is positively correlated with the included angle of adjacent two axial partition plates; a plurality of through holes are formed on the distribution pipe, and the number of the through holes is positively correlated with the diameter of the distribution pipe;

[0014] The radius of the bottom platform structure and the top platform structure is equal to the radius of the distribution cavity; the bottom of the bottom cylindrical platform structure has a protrusion which is in close contact with the channel on the radial partition plate, so that the rotating component can rotate relative to the radial partition plate;

[0015] When the rotating component rotates in the cylindrical space with the central rotating shaft as the axis, the distribution pipe rotates with the rotating component; when a certain distribution pipe of the rotating component coincides with the through hole of the distribution cavity, the refrigerant enters the corresponding distribution pipe and enters the corresponding distribution cavity region, thereby realizing distribution; when the distribution pipe coinciding with the through hole of the distribution cavity is switched, the size of the distribution pipe, the number of the through holes, and the size of the distribution cavity can be changed.

[0016] Further, the number of the axial partition plates is three, the included angles between adjacent two axial partition plates are different, and the cavity is divided into three first, second and third regions with different sizes.

[0017] Further, the sealing flange, the electric control element are further included; the cylindrical space is connected with the sealing flange through sealing bolts at one end of the inlet pipe, and the sealing effect can be achieved; the central rotating shaft passes through the sealing flange and is connected with the electric control element; the top end surface of the top cylindrical table structure is in contact with the sealing flange.

[0018] Further, the radius of the radial partition plate is equal to the internal radius of the distribution cavity; the number of the radial partition plates is the same as the number of the partition plates, and the positions of the two are corresponding.

[0019] Further, the first through hole, the second through hole and the third through hole with increasing size are arranged at the central positions of the first region, the second region and the third region of the radial partition plate; the first distribution pipe, the second distribution pipe and the third distribution pipe are respectively arranged in the first region, the second region and the third region; the outer diameters of the first distribution pipe, the second distribution pipe and the third distribution pipe are respectively embedded in the through holes of the first through hole, the second through hole and the third through hole.

[0020] Further, the fins are arranged between the two adjacent micro-channel flat pipe rows to enhance the heat dissipation effect.

[0021] Further, the included angles between the two adjacent axial partition plates are different; the included angle between the two adjacent axial partition plates corresponding to the first region is 60°, the included angle between the two adjacent axial partition plates corresponding to the second region is 120°, and the included angle between the two adjacent axial partition plates corresponding to the third region is 180°.

[0022] Further, the cross-sectional flow area size and the number of openings of the first distribution pipe, the second distribution pipe and the third distribution pipe are positively correlated with the cross-sectional flow area size of the corresponding chamber; the relationship between the internal radial cross-sectional area S1 of the distribution pipe and the internal radial cross-sectional area S2 of the corresponding chamber region is S1 = 0.1-0.6S2.

[0023] Further, the central rotating shaft and the sealing flange are connected through the bearing.

[0024] In addition, the application further provides a control method of the micro-channel evaporator matched with the flow, which is based on the non-uniformity of the outlet temperature of the micro-channel flat pipe row, and realizes the switching of the position of the rotating part 13 through the electric control element. The principle is that, along the flow direction of the distribution pipe of the refrigerant inlet internal flow dividing device 1, the refrigerant temperature at the outlet of the micro-channel flat pipe row in the front part of the flow direction is significantly lower than that in the rear part, which indicates that the volume of the distribution pipe and the distribution cavity is too large and should be adjusted smaller, and vice versa.

[0025] The specific control method is as follows:

[0026] Step 1) the positions where the fan-shaped through holes 125 combine with the first distribution pipe 15, the second distribution pipe 16 and the third distribution pipe 17 are respectively position one, position two and position three; temperature measuring points are arranged on the outer wall of the flat tube row of the outlet header 3 at the insertion side, and the temperature measuring points are opposite to the space where the first partition plate 124 divides the semi-cylindrical area 122, and the temperature measuring points are respectively t1, t2, …t n .

[0027] Step 2) when the measuring points are even, (t n -t1+t n-1 -t2…+t n / 2 -t n / 2-1 ) / n 2 >△t, the position of the rotating part has not reached the maximum, the electric control element 14 controls the rotating part to increase one, (t n -t1+t n-1 -t2…+t n / 2 -t n / 2-1 ) / n 2 <-△t, the position of the rotating part has not reached the maximum, the electric control element 14 controls the rotating part to decrease one, otherwise the position is unchanged; when the measuring points are odd, (t n -t1+t n-1 -t2…+t n / 2+1 -t n / 2-1 ) / (n 2 -1)>△t', the position of the rotating part has not reached the maximum, the electric control element controls the rotating part to increase one, (t n -t1+t n-1 -t2…+t n / 2+1 -t n / 2-1 ) / (n 2 -1)<-△t', the position of the rotating part has not reached the maximum, the electric control element 14 controls the rotating part to decrease one, otherwise the position is unchanged.

[0028] △t and △t' represent two different temperature difference values greater than zero, which are taken according to actual conditions.

[0029] Advantages of the present application:

[0030] The rotating part of the present application rotates around the central rotating shaft in the cylindrical space, and the distribution pipe rotates with the rotating part; when a certain distribution pipe of the rotating part coincides with the through hole of the distribution cavity, the refrigerant enters the corresponding distribution pipe and enters the corresponding distribution cavity area, thereby realizing distribution; when the distribution pipe coinciding with the through hole of the distribution cavity is switched, the size of the distribution pipe and the number of openings and the size of the distribution cavity can be changed. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the whole inlet with internal shunt micro-channel heat exchanger;

[0032] Figure 2 is Figure 1 is a whole view of the internal shunt device at the inlet;

[0033] Figure 3 is an exploded view of the internal shunt device at the inlet;

[0034] Figure 4 is a left view, a front view and a right view of the distribution cavity;

[0035] Figure 5 is a structural diagram of the rotating part without being installed in the distribution pipe;

[0036] Figure 6 is a structural diagram of the rotating part;

[0037] Figure 7 is Figure 6 a front view;

[0038] Figure 8 is Figure 7 a right view;

[0039] Figure 9 is a control method logic diagram of the micro-channel evaporator adapted to the flow;

[0040] Figure 10 is a temperature measurement point arrangement diagram of the control method of the micro-channel evaporator adapted to the flow.

[0041] Shown in the figure: internal shunt device 1 at the inlet, micro-channel flat tube row 2, outlet header 3, fin 4, outlet pipe 5, inlet pipe 6, logic control unit 7, sealing flange 11, distribution cavity 12, rotating part 13, electric control element 14, first distribution pipe 15, second distribution pipe 16, third distribution pipe 17, sealing bolt 111, cylindrical space 121, semi-cylindrical space 122, first radial partition 123, partition 124, fan-shaped through hole 125, inlet pipe connection area 126, distribution area 127, groove 128, central rotating shaft 131, radial partition 132, axial partition 133, bottom cylindrical platform structure 134, top cylindrical platform structure 135, protrusion 138, first through hole 1321, second through hole 1322, third through hole 1323, first area 1331, second area 1332, third area 1333. DETAILED DESCRIPTION

[0042] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0043] Referring to Figure 1 A micro-channel evaporator matched with flow rate includes an inlet inner distribution device 1, a micro-channel flat tube array 2, an outlet header 3, an outlet pipe 5, and an inlet pipe 6. The micro-channel flat tube array 2 is connected with the inlet inner distribution device 1 and the outlet header 3 at two ends respectively. The gas-liquid two-phase working medium enters from the inlet pipe 6, is uniformly distributed by the inner distribution device, flows into the micro-channel flat tube array 2 for evaporation, and finally flows out through the outlet header 3 and the outlet pipe 5.

[0044] Referring to Figure 3 The inlet inner distribution device 1 includes a distribution cavity 12 and a rotating component 13.

[0045] Specifically, referring to Figures 2-4 The distribution cavity 12 is divided into two regions, a cylindrical space 121 and a semi-cylindrical space 122, which are in communication with each other. The size of the cavity communicating with the semi-cylindrical space 122 inside the cylindrical space 121 can be changed. In order to make the size of the cavity more subject to the cylindrical space 121, the internal radius of the semi-cylindrical space 121 is less than or equal to the internal radius of the cylindrical space 121. The cylindrical space 121 has a through hole at one side end, into which the inlet pipe 6 is inserted. The cylindrical space 121 is divided into two parts by a first radial partition plate 123 close to the inlet pipe 6. The part connected with the inlet pipe 6 is an inlet pipe connection region 126, and the other part is a distribution region 127. The first radial partition plate 123 has a fan-shaped through hole 125 close to the semi-cylindrical region. The first radial partition plate 123 has a recessed groove 128, so that it can engage with the rotating component 13, and the rotating component can rotate relative to the partition plate. The semi-cylindrical space 122 is a header insertion end, in which a plurality of partition plates 124 are embedded. The partition plates 124 divide the semi-cylindrical space 122 into multiple regions, and each region is provided with a plurality of flat tube insertion ports. Preferably, 4-10 flat tube insertion ports are arranged between each partition plate.

[0046] Specifically, referring to Figures 5-8The rotating part 13 comprises a central rotating shaft 131, a plurality of second radial partitions 132, a plurality of axial partitions 133, a bottom cylindrical platform structure 134, and a top cylindrical platform structure 135. The central rotating shaft 131 passes through the centers of the bottom cylindrical platform structure 134 and the top cylindrical platform structure 135, and is provided with a plurality of axial partitions 133 radially outwardly with the axis of the central rotating shaft 131 as the center. The included angles of any two adjacent axial partitions 133 are different. A plurality of second radial partitions 132 are arranged at intervals between the bottom cylindrical platform structure 134 and the top cylindrical platform structure 135, and pass through the axial partitions 133, thereby dividing the space between any two adjacent axial partitions 133 into multiple sections. A distribution pipe is arranged between any two adjacent axial partitions 133. The distribution pipe passes through the second radial partitions 132, is sealed at the end close to the top cylindrical platform structure 135, and passes through the bottom cylindrical platform structure 134 at the other end. The inner diameter of the distribution pipe is positively correlated with the included angles of any two adjacent axial partitions 133. A plurality of through holes are formed in the distribution pipe, and the number of the through holes is positively correlated with the diameter of the distribution pipe.

[0047] The radii of the bottom cylindrical platform structure 134 and the top cylindrical platform structure 135 are equal to the radius of the distribution cavity 12. The bottom of the bottom cylindrical platform structure 134 is provided with a protrusion 138, which is in close contact with the groove 128 of the first radial partition 123, so that the rotating part 13 can rotate relative to the first radial partition 123. When the rotating part 13 rotates in the cylindrical space 121 with the central rotating shaft 131 as the axis, the distribution pipe rotates together with the rotating part 13. When a certain distribution pipe of the rotating part 13 coincides with the through hole of the distribution cavity 12, the refrigerant enters the corresponding distribution pipe and the corresponding area of the distribution cavity 12, thereby realizing distribution. When the distribution pipe coinciding with the through hole of the distribution cavity 12 is switched, the size of the distribution pipe, the number of the through holes, and the size of the distribution cavity 12 can be changed.

[0048] The part of the central rotating shaft 131 extending out of the sealing flange 11 is combined with the electric control element 14. The electric control element 14 is controlled by the logic control unit 7. The temperature sensor transmits temperature information to the logic control unit 7. The logic control unit 7 controls the rotation of the central rotating shaft, thereby realizing the switching of the position of the rotating part 13.

[0049] As a preferred embodiment of the present application, referring to Figures 5-8 The number of the axial partitions 133 is three. The included angles of any two adjacent axial partitions 133 are different, thereby dividing the cavity into three first areas 1331, second areas 1332, and third areas 1333 with different sizes.

[0050] As a preferred embodiment of the present application, referring to Figures 2-3It also includes sealing flange 11, electric control element 14; cylindrical space 121 is connected with sealing flange 11 through sealing bolt 111 at one end relative to inlet pipe 6, which can play a sealing effect; center rotating shaft 131 passes through sealing flange 11 and is connected with electric control element 14, which can control the rotation of the center rotating shaft. The top end surface of the top cylindrical platform structure 135 is in contact with the sealing flange 11. When the convex 138 of the top cylindrical platform structure 135 on the bottom platform structure 134 is in close contact with the groove 128 of the partition plate 123, the top end surface of the top cylindrical platform structure 135 is flush with the top end surface of the side of the chamber 12 in contact with the sealing flange 11.

[0051] As a preferred embodiment of the present application, see Figures 3-5 , the second radial partition plate 132 has a radius equal to the internal radius of the distribution cavity 12; the number of the second radial partition plate 132 is the same as that of the partition plate 124, and the positions of the two correspond to each other.

[0052] As a preferred embodiment of the present application, see Figure 5 , the second radial partition plate 132 has a first through hole 1321, a second through hole 1322 and a third through hole 1323 with increasing sizes at the center positions of the first region 1331, the second region 1332 and the third region 1333; the first region 1331, the second region 1332 and the third region 1333 correspond to the first distribution pipe 15, the second distribution pipe 16 and the third distribution pipe 17 respectively; the outer diameters of the first distribution pipe 15, the second distribution pipe 16 and the third distribution pipe 17 are respectively embedded in the through holes of the first through hole 1321, the second through hole 1322 and the third through hole 1323.

[0053] As a preferred embodiment of the present application, see Figure 1 , fins 4 are arranged between the two adjacent micro-channel flat tubes 2.

[0054] As a preferred embodiment of the present application, see Figures 5-7 , the included angles between the two adjacent axial partition plates 133 are different, in order to ensure the difference in size of the three region cavities divided by the axial partition plates 133, the included angle between the two adjacent axial partition plates 133 corresponding to the first region 1331 is set to 60°, the included angle between the two adjacent axial partition plates 133 corresponding to the second region 1332 is set to 120°, and the included angle between the two adjacent axial partition plates 133 corresponding to the third region 1333 is set to 180°.

[0055] As a preferred embodiment of the present application, the cross-sectional flow area size and the number of openings of the first distribution pipe 15, the second distribution pipe 16, and the third distribution pipe 17 should be positively correlated with the size of the cross-sectional flow area of the corresponding first region 1331, the second region 1332, and the third region 1333. The relationship between the radial cross-sectional area S1 inside the distribution pipe and the radial cross-sectional area S2 inside the corresponding chamber region is S1 = 0.1-0.6S2.

[0056] As a preferred embodiment of the present application, the central rotating shaft 131 is connected to the sealing flange 11 through a bearing.

[0057] In addition, the present application also proposes a control method for the above-mentioned micro-channel evaporator with flow adaptation. The control method is based on the non-uniformity of the outlet temperature of the micro-channel flat tube row 2. The electric control element 14 is controlled by the logic control unit 7. The temperature sensor transmits temperature information to the logic control unit 7. The logic control unit 7 controls the rotation of the rotating center shaft to switch the position of the rotating part 13. The principle is that along the flow direction of the distribution pipe of the refrigerant inlet inner flow distribution device 1, the refrigerant temperature at the outlet of the micro-channel flat tube row 2 in the front part of the flow direction is significantly lower than that in the rear part, which indicates that the distribution pipe and the distribution cavity volume are too large and should be adjusted smaller, and vice versa.

[0058] Referring to Figure 9 , Figure 10 , the specific control method is:

[0059] Step 1) Set the positions of the fan-shaped through holes 125 combined with the first distribution pipe 15, the second distribution pipe 16, and the third distribution pipe 17 as position one, position two, and position three, respectively. Temperature measuring points are arranged on the outer wall of the flat tube row insertion side of the outlet header 3, opposite to the space divided by the first partition plate 124 in the semi-cylindrical region 122, along the end of the outlet header 3 from the outlet pipe position direction, and each temperature measuring point is marked as t1, t2, … t n .

[0060] Step 2) When the number of measuring points is even, (t n -t1+t n-1 -t2…+t n / 2 -t n / 2-1 ) / n 2 >△t, the position of the rotating part has not reached the maximum, the electric control element 14 controls the position of the rotating part to increase by one, (t n -t1+t n-1 -t2…+t n / 2 -t n / 2-1 ) / n 2When the position of the rotating part is not the minimum, the electric control element 14 controls the rotating part to rotate one position less, otherwise the position is unchanged; when the measuring points are odd, (t n -t1+t n-1 -t2…+t n / 2+1 -t n / 2-1 ) / (n 2 -1)<-△t' when the position of the rotating part is not the maximum, the electric control element controls the rotating part position to add one, (t n -t1+t n-1 -t2…+t n / 2+1 -t n / 2-1 ) / (n 2 -1)<-△t' when the position of the rotating part is not the minimum, the electric control element 14 controls the rotating part to rotate one position less, otherwise the position is unchanged.

[0061] △t, △t' represent two different temperature difference values greater than zero, which are taken according to actual conditions.

[0062] The above only describes the embodiments of the present application, and does not limit the protection scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related system fields, are also included in the protection scope of the present application.

Claims

1. A micro-channel evaporator adapted to flow, characterized in that: It comprises an inlet inner distribution device (1), a micro-channel flat tube row (2), an outlet header (3), an outlet pipe (5), an inlet pipe (6); the micro-channel flat tube row (2) is connected with the inlet inner distribution device (1) and the outlet header (3) at both ends respectively, the gas-liquid two-phase working medium enters from the inlet pipe (6), is distributed uniformly by the inner distribution device, then flows into the micro-channel flat tube row (2) for evaporation, and finally flows out from the outlet pipe (5) through the outlet header (3); The inlet inner distribution device (1) comprises a distribution cavity (12) and a rotating part (13); The distribution cavity (12) is internally divided into two regions, which are a cylindrical space (121) and a semi-cylindrical space (122), and the two regions are in communication with each other, and the inner radius of the semi-cylindrical space (122) is less than or equal to the inner radius of the cylindrical space (121); The cylindrical space (121) is connected with the inlet pipe (6) at one end; the inside of the cylindrical space (121) is divided into two parts by a first radial partition plate (123) close to the inlet pipe (6), and the part connected with the inlet pipe (6) is an inlet pipe connecting region (126), and the other part is a distribution region (127); a fan-shaped through hole (125) is formed in the first radial partition plate (123) close to the semi-cylindrical region, and the first radial partition plate (123) has a recessed channel (128); a plurality of partition plates (124) are embedded in the semi-cylindrical space (122), and the partition plates (124) divide the semi-cylindrical space (122) into multiple regions, and each region is provided with a plurality of flat tube insertion ports; The rotating part (13) comprises a central rotating shaft (131), a plurality of second radial partition plates (132), a plurality of axial partition plates (133), a bottom cylindrical table structure (134), and a top cylindrical table structure (135); The central rotating shaft (131) passes through the centers of the bottom cylindrical table structure (134) and the top cylindrical table structure (135), and a plurality of axial partition plates (133) are radially arranged outwardly with the axis of the central rotating shaft (131) as the center, the included angle of adjacent two axial partition plates (133) is different, a plurality of second radial partition plates (132) are arranged at intervals between the bottom cylindrical table structure (134) and the top cylindrical table structure (135) and pass through the axial partition plates (133), thereby dividing the space between adjacent two axial partition plates (133) into multiple sections; a distribution pipe is arranged between adjacent two axial partition plates (133), the distribution pipe passes through the second radial partition plate (132), one end of the distribution pipe close to the top cylindrical table structure (135) is sealed, and the other end passes through the bottom cylindrical table structure (134), the inner diameter of the distribution pipe is positively correlated with the included angle of adjacent two axial partition plates (133); a plurality of through holes are formed in the distribution pipe, and the number of the through holes is positively correlated with the diameter of the distribution pipe. The radius of the bottom cylindrical platform structure (134) and the top cylindrical platform structure (135) is equal to the radius of the distribution cavity (12); the bottom of the bottom cylindrical platform structure (134) has a protrusion which is in close contact with the groove (128) on the first radial partition (123), so that the rotating part (13) can rotate relative to the first radial partition (123); When the rotating part (13) rotates around the central rotating shaft (131) in the cylindrical space (121), the distribution pipe rotates with the rotating part (13); when a certain distribution pipe of the rotating part (13) coincides with the fan-shaped through hole of the distribution cavity (12), the refrigerant enters the corresponding distribution pipe and the corresponding distribution cavity (12) area, realizing distribution; when the distribution pipe coinciding with the fan-shaped through hole of the distribution cavity (12) is switched, the size of the distribution pipe, the number of openings and the size of the distribution cavity (12) can be changed.

2. The micro-channel evaporator adapted to flow rate according to claim 1, characterized in that: The number of the axial partitions (133) is three, and the included angle between adjacent two axial partitions (133) is different, so as to divide the cavity into three first areas (1331), second areas (1332) and third areas (1333) with different sizes.

3. The micro-channel evaporator adapted to flow rate according to claim 2, characterized in that: It further comprises a sealing flange (11) and an electric control element (14); the other end of the cylindrical space (121) opposite to the inlet pipe (6) is connected with the sealing flange (11) through sealing bolts (111), so as to achieve the sealing effect; the central rotating shaft (131) passes through the sealing flange (11) and is connected with the electric control element (14); the top end surface of the top cylindrical platform structure (135) is in contact with the sealing flange (11).

4. The micro-channel evaporator adapted to flow rate according to claim 3, characterized in that: The radius of the second radial partition (132) is equal to the inner radius of the distribution cavity (12); the number of the second radial partition (132) is the same as that of the partition (124), and the positions of the two are corresponding.

5. The micro-channel evaporator adapted to flow rate according to claim 4, characterized in that: The second radial partition (132) is provided with a first through hole (1321), a second through hole (1322) and a third through hole (1323) with increasing sizes at the center positions of the first area (1331), the second area (1332) and the third area (1333); the first area (1331), the second area (1332) and the third area (1333) correspond to the first distribution pipe (15), the second distribution pipe (16) and the third distribution pipe (17) respectively; the outer diameters of the first distribution pipe (15), the second distribution pipe (16) and the third distribution pipe (17) are respectively embedded in the through holes of the first through hole (1321), the second through hole (1322) and the third through hole (1323).

6. The micro-channel evaporator adapted to flow rate according to claim 5, characterized in that: Fins (4) are arranged between two adjacent micro-channel flat tube rows (2).

7. The micro-channel evaporator of claim 6, wherein: The included angle between the two adjacent axial baffles (133) is different, the included angle between the two adjacent axial baffles (133) corresponding to the first area (1331) is 60°, the included angle between the two adjacent axial baffles (133) corresponding to the second area (1332) is 120°, and the included angle between the two adjacent axial baffles (133) corresponding to the third area (1333) is 180°.

8. The micro-channel evaporator of claim 7, wherein: The cross-sectional flow area size and the number of openings of the first distribution pipe (15), the second distribution pipe (16), and the third distribution pipe (17) should be positively correlated with the size of the corresponding chamber area, and the relationship between the internal radial cross-sectional area of the distribution pipe and the internal radial cross-sectional area of the corresponding chamber area is S1=0.1~0.6S2.

9. The micro-channel evaporator of claim 8, wherein: The center rotating shaft (131) and the sealing flange (11) are connected through a bearing.

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