Evaporator

Abstract

The present application provides an evaporator, comprising: a shell, a first heat exchange tube group and a second heat exchange tube group, and a first side baffle and a second side baffle, wherein the first heat exchange tube group is located at the lower part of the chamber, and the second heat exchange tube group is located above the first heat exchange tube group; each of the first side baffle and the second side baffle comprises a main body, the main body is arranged adjacent to the second heat exchange tube group, the main body comprises a top and a bottom arranged oppositely, and a waist located between the top and the bottom, and the spacing between the waists of the first side baffle and the second side baffle is smaller than the spacing between the tops, and smaller than the spacing between the bottoms. The heat exchanger in the present application has a high heat exchange efficiency.

Description

Technical Field

[0001] The present application relates to an evaporator, and in particular to a shell and tube evaporator with high heat exchange efficiency. Background Art

[0002] The traditional refrigeration system has an evaporator, a condenser, a throttling device and a compressor. When the low-temperature refrigerant liquid passes through the evaporator, it exchanges heat with the outside world and absorbs the heat from the outside world, thereby lowering the outside temperature to achieve the refrigeration effect. The outside world can be air or chilled water. After the heat exchange, the refrigerant liquid vaporizes and becomes refrigerant gas and enters the compressor. The shell and tube evaporator has certain requirements for the refrigerant filling amount. Too much or too little may affect the heat exchange performance of the evaporator and even affect the operation of the entire refrigeration system. Summary of the invention

[0003] The evaporator provided in the present application has a high heat exchange efficiency. Compared with the traditional fully liquid evaporator, the evaporator provided in the present application can save the refrigerant filling amount and improve the heat exchange efficiency of the evaporator.

[0004] The evaporator in the present application comprises: a shell, a first heat exchange tube group and a second heat exchange tube group, and a first side baffle and a second side baffle; the shell has a cavity and a refrigerant inlet and a refrigerant outlet communicated with the cavity, and the cavity has a length direction, a width direction and a height direction; each heat exchange tube in the first heat exchange tube group and the second heat exchange tube group extends along the length direction of the cavity, the first heat exchange tube group is located at the lower part of the cavity, and the second heat exchange tube group is located above the first heat exchange tube group; the first side baffle and the second side baffle are respectively arranged on both sides of the second heat exchange tube group in the width direction, and the first side baffle and the second side baffle are configured to guide the refrigerant flowing out of the first heat exchange tube group to flow to the second heat exchange tube group; wherein each of the first side baffle and the second side baffle comprises a main body, the main body is arranged adjacent to the second heat exchange tube group, the main body comprises a top and a bottom arranged oppositely, and a waist located between the top and the bottom, and the spacing between the waists of the first side baffle and the second side baffle is smaller than the spacing between the tops, and smaller than the spacing between the bottoms.

[0005] In the evaporator as described above, in the height direction, one end of the first side baffle and the second side baffle extends beyond the second heat exchange tube group, and the other end extends to the inner wall of the shell.

[0006] In the evaporator as described above, the shape of the main body matches the shape of the second heat exchange tube group, the bottom of the main body is arranged toward the first heat exchange tube group, the spacing between the bottoms of the respective main bodies of the first side baffle and the second side baffle is W21, the spacing between the tops is W22, and the spacing between the waists is W23, wherein W21≥W22>W23.

[0007] In the evaporator as described above, the main body includes a first part and a second part, the first part extends from the top of the main body to the waist, the second part extends from the bottom of the main body to the waist, the cross-sections of the first part and the second part are straight lines, and the angle between the first part and the second part is between 100° and 170°.

[0008] In the evaporator as described above, the cross sections of the main bodies of the first side baffle and the second side baffle are hyperbolic.

[0009] In the evaporator as described above, each of the first side baffle and the second side baffle includes an extension portion, which is connected to the bottom of the main body and extends to the inner wall of the shell along the width direction of the cavity.

[0010] The evaporator as described above further includes a top baffle, which includes an outlet section and a pair of guide sections, wherein the outlet section is arranged above the second heat exchange tube group and has a spacing between the first side baffle and the second side baffle, and the pair of guide sections are respectively connected to the two ends of the outlet section and extend obliquely downward toward the inner wall of the shell and have a spacing between the inner wall of the shell, and in the height direction of the cavity, the distal ends of the pair of guide sections are respectively lower than the tops of the main bodies of the first side baffle and the second side baffle.

[0011] In the evaporator as described above, in the width direction of the cavity, the maximum width of the first heat exchange tube group is greater than the maximum width of the second heat exchange tube group; the evaporator is configured so that the liquid level of the refrigerant submerges the first heat exchange tube group; and liquid return openings are provided on the first side baffle and the second side baffle, and the height of the liquid return openings is higher than the height of the first heat exchange tube group.

[0012] The evaporator as described above further includes a defogger baffle, which is disposed between the top baffle and the shell to cover the gap between the top baffle and the shell; or disposed between the top baffle and the refrigerant outlet to cover the refrigerant outlet.

[0013] In the evaporator as described above, the refrigerant inlet is adjacent to the lower portion of the first heat exchange tube group, and the height of the refrigerant outlet is higher than the height of the second heat exchange tube group.

[0014] The evaporator in the present application has a first heat exchange tube group and a second heat exchange tube group, and the second heat exchange tube group is located above the first heat exchange tube group. A first side baffle and a second side baffle are provided on both sides of the second heat exchange tube group, wherein the first side baffle and the second side baffle have waists, so that the fluid flowing through the second heat exchange tube group can be accelerated first and then decelerated, thereby improving the heat exchange efficiency of the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic block diagram of a refrigeration system 100;

[0016] Figure 2 yes Figure 1 A perspective view of a first embodiment of the evaporator 130;

[0017] Figure 3A yes Figure 2 A radial cross-sectional view of the evaporator;

[0018] Figure 3B yes Figure 3A A radial cross-sectional view of the evaporator in the middle is a schematic diagram after hiding the heat exchange tube group;

[0019] Figure 4A yes Figure 3A A schematic diagram of the middle extension;

[0020] Figure 4B yes Figure 3A Another schematic diagram of the middle extension;

[0021] Figure 5 is a cross-sectional view of an evaporator of a second embodiment of the present application;

[0022] Figure 6 is a cross-sectional view of an evaporator in a third embodiment of the present application;

[0023] Figure 7 is a cross-sectional view of an evaporator of a fourth embodiment of the present application;

[0024] Figure 8 is a cross-sectional view of an evaporator of a fifth embodiment of the present application;

[0025] Fig. 9 is a cross-sectional view of an evaporator of a sixth embodiment of the present application;

[0026] Fig.10 It is a cross-sectional view of an evaporator according to the seventh embodiment of the present application. DETAILED DESCRIPTION

[0027] Various specific embodiments of the present application will be described below with reference to the accompanying drawings that form a part of this specification. It should be understood that although terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "positive", "negative", "proximal", "distal", "lateral", "longitudinal", etc., are used in the present application to describe various example structural parts and elements of the present application, these terms are used here only for the purpose of convenience of description, and these terms are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations.

[0028] Ordinal numbers such as "first" and "second" used in this application are only used for distinction and identification, and do not have any other meanings. If not specifically specified, they do not indicate a specific order or have a specific association. For example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0029] Figure 1 is a schematic block diagram of the refrigeration system 100. Figure 1 As shown, the refrigeration system 100 includes a compressor 110, a condenser 120, a throttling device 140 and an evaporator 130, which are connected by pipelines to form a refrigerant circulation loop, and the loop is filled with refrigerant. Figure 1 As shown in the direction of the arrow in , the refrigerant flows through the compressor 110, the condenser 120, the throttling device 140 and the evaporator 130 in sequence, and enters the compressor 110 again. During the refrigeration process, the throttling device 140 throttles the high-pressure liquid refrigerant from the condenser 120 to reduce its temperature and pressure; the low-pressure refrigerant exchanges heat with the object to be cooled in the evaporator 130, absorbs the heat of the object to be cooled, is vaporized and evaporates; the refrigerant vapor generated by vaporization is sucked into the compressor 110, and is discharged at high pressure after being compressed; the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 110 exchanges heat with the ambient medium in the condenser 120, releases heat and condenses into liquid refrigerant; the high-temperature liquid refrigerant flows through the throttling device 140 again to reduce its pressure. This cycle repeats, producing a continuous refrigeration effect.

[0030] Figure 2 yes Figure 1 A perspective view of a first embodiment of the evaporator 130, as shown in FIG. Figure 2 As shown, the evaporator 130 comprises a shell 201 and a pair of tube sheets 208 and 209. The shell 201 is a cylindrical shape with openings at both ends. The pair of tube sheets 208 and 209 are respectively disposed at both ends of the shell 201 to seal the openings at both ends of the shell 201. The shell 201 and the pair of tube sheets 208 and 209 enclose a cavity 305, and the cavity 305 is used to accommodate heat exchange tubes. Figure 2 , the evaporator 130 has a height direction H, a length direction L and a width direction W, and the height direction, length direction and width direction of the cavity 305 are consistent with the direction of the evaporator 130. The shell 201 is provided with a refrigerant inlet 211 and a refrigerant outlet 212, wherein the refrigerant outlet 212 is located at the upper part of the height direction of the evaporator 130, and the refrigerant inlet 211 is located at the lower part of the height direction of the evaporator 130. The liquid refrigerant or the gas-liquid mixed refrigerant in the refrigeration system 100 enters the evaporator 130 from the refrigerant inlet 211, absorbs heat in the evaporator 130, and becomes a gaseous refrigerant, and is discharged from the refrigerant outlet 212.

[0031] Figure 3A yes Figure 2 A radial cross-sectional view of the evaporator.

[0032] like Figure 3A As shown, a cavity 305 is formed inside the shell 201 , and a heat exchange tube group 310 , a distributor 330 , a first side baffle 311 , a second side baffle 312 and a top baffle 370 are arranged in the cavity 305 .

[0033] The heat exchange tube group 310 is a heat exchange tube bundle formed by a plurality of mutually parallel heat exchange tubes. Each heat exchange tube in the heat exchange tube bundle extends along the length direction L of the cavity 305. A fluid channel is formed in the heat exchange tube for circulating water or other media. The fluid channel is formed by connecting a plurality of heat exchange tubes end to end in sequence. The gap between each heat exchange tube and the adjacent heat exchange tube forms a refrigerant channel for circulating refrigerant. The medium in the fluid channel and the refrigerant in the refrigerant channel transfer heat through the tube wall of the heat exchange tube. The heat exchange tube group 310 includes a first heat exchange tube group 301 and a second heat exchange tube group 302, wherein the second heat exchange tube group 302 is arranged above the first heat exchange tube group 301.

[0034] In one embodiment of the present application, Figure 2 and Figure 3A As shown, the refrigerant inlet 211 is arranged below the housing 201 and is located in the middle of the length direction of the evaporator 130. The refrigerant inlet 211 is also located in the middle of the width direction of the evaporator 130, so that in the height direction of the evaporator 130, the refrigerant inlet 211 is located at the lowest position. The distributor 330 is arranged at the bottom of the cavity 305 and is located above the refrigerant inlet 211, and is used to guide the refrigerant entering the evaporator 130 to flow in the length direction of the cavity 305 so as to be distributed to the heat exchange tube group 310 as evenly as possible.

[0035] In another embodiment of the present application, the positions of the refrigerant inlet 211 and the distributor 330 are higher than the bottom of the cavity 305 , but not higher than the first heat exchange tube group 301 .

[0036] like Figure 3AAs shown, the first heat exchange tube group 301 is arranged upward from the inner wall of the bottom of the cavity shell 201 and the outside of the distributor 330, and the first heat exchange tube group 301 has an upper part 315 and a lower part 316. The lower part 316 is roughly adjacent to and arranged along the inner wall of the shell 201, and the upper part 315 is roughly flush in the height direction of the cavity 305. From the length direction L of the evaporator 130, the contour of the lower part 316 of the first heat exchange tube group 301 is roughly arc-shaped, and the contour of the upper part 315 is roughly horizontal straight line, and the two ends of the lower part 316 are connected to the two ends of the upper part 315. The upper part 315 has a first heat exchange tube group width W11.

[0037] The second heat exchange tube group 302 is arranged upward from the upper portion 315 of the first heat exchange tube group 301. The second heat exchange tube group 302 has an upper portion 318, a lower portion 319 and a pair of side portions 328 and 329. The lower portion 319 of the second heat exchange tube group 302 is adjacent to the upper portion 315 of the first heat exchange tube group 301. The lower portion 319 of the second heat exchange tube group 302 has a second heat exchange tube group width W12, and the width W12 of the second heat exchange tube group is smaller than the width W11 of the first heat exchange tube group. The second heat exchange tube group 302 is arranged in the middle of the width direction of the cavity 305, so that a certain distance is formed between the pair of side portions 328 and 329 of the second heat exchange tube group 302 and the inner wall of the shell 201.

[0038] The first heat exchange tube group 301 has a first area 361 and a pair of second areas 362 and 363, and the pair of second areas 362 and 363 are respectively located on both sides of the first area 361. In the width direction of the cavity 305, the bottom of the second heat exchange tube group 302 is aligned with the first area 361, and the second areas 362 and 363 are staggered from the lower part 319 of the second heat exchange tube group 302.

[0039] In one embodiment of the present application, the heat exchange tubes in the first heat exchange tube group 301 and the second heat exchange tube group 302 have the same diameter and are evenly arranged in rows. The total number of rows in the first heat exchange tube group 301 is greater than the total number of rows in the second heat exchange tube group 302.

[0040] The second heat exchange tube group 302 has a middle portion 317 between the upper portion 318 and the lower portion 319. In the width direction of the cavity 305, the width of the second heat exchange tube group 302 gradually narrows from the lower portion 319 to the middle portion 317, and then gradually widens from the middle portion 317 to the upper portion 318. That is, the width of the second heat exchange tube group 302 is the smallest at the middle portion 317. In one embodiment of the present application, the number of columns of a row of heat exchange tubes at the middle portion 317 is the smallest.

[0041] In the width direction, a first side baffle 311 and a second side baffle 312 are respectively provided on both sides of the second heat exchange tube group 302 , and the first side baffle 311 and the second side baffle 312 are used to guide the refrigerant flowing out of the first heat exchange tube group 301 to flow to the second heat exchange tube group 302 .

[0042] Figure 3B yes Figure 3A A schematic diagram of a radial cross-sectional view of the evaporator after hiding the heat exchange tube. In this embodiment, the first side baffle 311 and the second side baffle 312 are symmetrical structures. Figure 3B As shown, the first side baffle 311 includes a main body 321 and an extension 323. The main body 321 is arranged adjacent to the side 328 of the second heat exchange tube group, and the extension 323 is located above the first heat exchange tube group 301. The main body 321 has a top 341, a bottom 342 and a waist 343. The waist 343 is located between the top 341 and the bottom 342. The top 341 extends beyond the upper part 318 of the second heat exchange tube group 302 in the height direction of the cavity 305. The bottom 342 is roughly flush with the lower part 319 of the second heat exchange tube group 302. The bottom 342 is connected to one side of the extension 323, and the extension 323 extends from the bottom 342 along the width direction of the cavity 305 toward the inner wall of the shell 201, and is connected to the inner wall of the shell 201. The main body 321 includes a first portion 351 and a second portion 352. The first portion 351 extends from the top 341 of the main body 321 to the waist 343, and the second portion 352 extends from the bottom 342 of the main body 321 to the waist 343. In this embodiment, the cross-sections of the first portion 351 and the second portion 352 are straight lines, that is, the first portion 351 and the second portion 352 are both flat plates. The first portion 351 and the second portion 352 are both inclined and extended relative to the height direction of the cavity 305. The waist 343 is closer to the main body 322 of the second side baffle 312 than the top 341 or the bottom 342, so that an obtuse angle is formed between the first portion 351 and the second portion 352, and the angle between the first portion 351 and the second portion 352 is between 100° and 170°.

[0043] Similarly, the second side baffle 312 includes a main body 322 and an extension 324. The main body 322 is arranged adjacent to the side 329 of the second heat exchange tube group, and the extension 324 is located above the first heat exchange tube group 301. The main body 322 has a top 346, a bottom 347 and a waist 348. The waist 348 is located between the top 346 and the bottom 347. The top 346 extends beyond the upper portion 318 of the second heat exchange tube group 302 in the height direction of the cavity 305. The bottom 347 is roughly flush with the lower portion 319 of the second heat exchange tube group 302. The bottom 347 is connected to one side of the extension 324, and the extension 324 extends from the bottom 347 along the width direction of the cavity 305 toward the inner wall of the shell 201, and is connected to the inner wall of the shell 201. The main body 322 includes a first portion 356 and a second portion 357. The first portion 356 extends from the top 346 of the main body 322 to the waist 348, and the second portion 357 extends from the bottom 347 of the main body 322 to the waist 348. In this embodiment, the cross-sections of the first portion 356 and the second portion 357 are straight lines, that is, the first portion 356 and the second portion 357 are both flat plates. The first portion 356 and the second portion 357 are both inclined and extended relative to the height direction of the cavity 305. The waist 348 is closer to the main body 321 of the first side baffle 311 than the top 346 or the bottom 347, so that an obtuse angle is formed between the first portion 356 and the second portion 357, and the angle between the first portion 356 and the second portion 357 is between 100° and 170°.

[0044] In one embodiment of the present application, the extensions 323 and 324 are provided with liquid return openings 385 to allow fluid to pass through. The liquid return openings 385 are small in area to prevent a large amount of fluid that has been heat exchanged by the first heat exchange tube group 301 from directly overflowing from the liquid return openings 385 .

[0045] In the width direction of the cavity 305, the main bodies 321 and 322 of the first side baffle 311 and the second side baffle 312 are respectively formed into a shape that is narrow in the middle and wide at both ends. The distance between the bottom 342 of the first side baffle 311 and the bottom 347 of the second side baffle 312 is W21, the distance between the top 341 of the first side baffle 311 and the top 346 of the second side baffle 312 is W22, the distance between the waist 343 of the first side baffle 311 and the waist 348 of the second side baffle 312 is W23, and the distance between the distal ends of the extensions 323 and 324 of the first side baffle 311 and the second side baffle 312 is W24, wherein W24>W21≥W22>W23.

[0046] The top baffle 370 is disposed above the heat exchange tube group 310 and extends along the width direction and the length direction of the cavity 305. The top baffle 370 includes an outlet section 371 and a pair of guide sections 372, 373. The outlet section 371 is disposed above the second heat exchange tube group 302 and has a certain distance between the top end of the first side baffle 311 and the top end of the second side baffle 312, allowing the fluid to flow between the top baffle 370 and the first side baffle 311 and the second side baffle 312. A pair of guide sections 372 and 373 are respectively connected to the two ends of the outlet section 371 and extend obliquely downward toward the inner wall of the shell 201. There is a distance between the guide sections 372 and 373 and the inner wall of the shell 201, and there is a distance between the top end of the first side baffle 311 and the top end of the second side baffle 312. In the height direction of the cavity 305 , the distal ends of the drainage sections 372 and 373 are respectively lower than the tops of the main bodies 321 and 322 of the first side baffle 311 and the second side baffle 312 .

[0047] In this embodiment, the width of the outlet section 371 is greater than W22. In other embodiments, the width of the outlet section 371 may be less than W22, as long as the maximum width between the drainage sections 372 and 373 is greater than W22. The outlet section 371, the drainage sections 372 and 373 may be separate components connected together by welding or screw connection, or may be integrally formed components.

[0048] The distributor 330 is generally in the shape of an elongated strip and extends along the length direction of the chamber 305. The distributor 330 includes a first plate 398 and a second plate 399, the proximal ends of the first plate 398 and the second plate 399 in the width direction are connected to each other, and an angle is formed between the first plate 398 and the second plate 399. From a cross section, the distributor 330 is in an inverted "V" shape. When the distributor 330 is installed in the chamber 305, the distal ends of the first plate 398 and the second plate 399 abut against the lower part of the shell 201, and a long strip distribution space 339 is formed between the distributor 330 and the shell 201. The refrigerant inlet 211 is connected to the distribution space 339. The distributor 330 can guide the refrigerant entering the distribution space 339 to flow along the length direction, so as to be quickly and evenly distributed to the first heat exchange tube group 301.

[0049] Figure 3BThe flow direction of the refrigerant is shown in the figure, the hollow arrows represent the gaseous refrigerant, and the solid arrows represent the liquid refrigerant. The low-temperature refrigerant enters the distribution space 339 formed between the distributor 330 and the shell 201 from the refrigerant inlet 211. The refrigerant flows along the length direction of the cavity 305 in the distribution space 339. During the operation of the evaporator, the liquid level of the refrigerant is maintained at about the same level as the top of the first heat exchange tube group 301, that is, the first heat exchange tube group 301 is immersed in the liquid refrigerant. The refrigerant in the heat exchange tube gap of the heat exchange tube exchanges heat with the fluid in the heat exchange tube, and a part of the refrigerant absorbs heat and becomes gaseous. The gaseous refrigerant will move upward. The gaseous refrigerant generated in the heat exchange process in the first heat exchange tube group 310 will carry a large amount of liquid refrigerant and move upward into the second heat exchange tube group 302 to continue heat exchange. The first side baffle 311 and the second side baffle 312 guide the refrigerant to flow upward. Since the width of the second heat exchange tube group 302 is smaller than the width of the first heat exchange tube group 301 at the connection between the first heat exchange tube group 301 and the second heat exchange tube group 302, that is, the flow cross-sectional area of ​​the second heat exchange tube group 302 is smaller than the flow cross-sectional area of ​​the first heat exchange tube group 301, the refrigerant entering the second heat exchange tube group 302 from the first heat exchange tube group 301 can be accelerated, so that the liquid refrigerant entrained by the gaseous refrigerant can flow upward in the second heat exchange tube group 302 to a certain height. The gas-liquid mixed refrigerant entering the second heat exchange tube group 302 continues to exchange heat with the second heat exchange tube group 302, and a part of the liquid refrigerant is converted into gas, which continues to drive the refrigerant fluid to flow upward.

[0050] After heat exchange in the second heat exchange tube group 302, the refrigerant flows toward the top baffle 370, wherein the gaseous refrigerant flows out from the gap between the top baffle 370 and the first side baffle 311 and the second side baffle 312, and then flows out from the refrigerant outlet 212 after passing through the gap between the top baffle 370 and the shell 201. A portion of the liquid refrigerant after heat exchange in the second heat exchange tube group 302 is blocked by the top baffle 370 and changes its flow direction, and returns to the heat exchange tube group 310 to continue heat exchange, and another portion flows out from the gap between the top baffle 370 and the first side baffle 311 and the second side baffle 312. The guide sections 372 and 373 of the top baffle 370 guide this portion of the fluid downward into the space between the first side baffle 311 and the second side baffle 312 and the shell. Thus, the refrigerant falls on the extension portion 323 of the first side baffle 311 and the extension portion 324 of the second side baffle 312. The refrigerant re-enters the first heat exchange tube group 301 from the liquid return openings 385 on the extension portions 323 and 324 to continue heat exchange.

[0051] When the fluid is exchanging heat in the second heat exchange tube group 302, the flow velocity of the fluid changes. Below the height of the waist 343 and the waist 348, the second portion 352 of the first side baffle 311 and the second portion 357 of the second side baffle 312 are inclined toward each other, and the flow cross-sectional area of ​​the refrigerant gradually decreases from bottom to top. Therefore, when the refrigerant flows from the height of the bottom 342 and the bottom 347 to the height of the waist 343 and the waist 348, the flow velocity will gradually increase, thereby ensuring that the liquid in the refrigerant gas will not be separated due to gravity, and can be entrained to a higher position to ensure that the heat exchange tube surface above the waist 343 and 348 can obtain sufficient refrigerant liquid, thereby ensuring the heat exchange performance.

[0052] Above the height of the waist 343 and the waist 348, the first portion 351 of the first side baffle 311 and the first portion 356 of the second side baffle 312 are inclined away from each other, and the flow cross-sectional area of ​​the refrigerant gradually increases from bottom to top. When the refrigerant flows from the height of the waist 343 and the waist 348 to the height of the top 341 and the top 346, the flow cross-sectional area of ​​the refrigerant gradually increases, and the refrigerant flow rate gradually decreases. The large droplets entrained in the refrigerant gas are separated from the gas due to gravity and fall back into the heat exchange tube group. When the refrigerant flows out of the upper portion 318 of the second heat exchange tube group 302, a small amount of refrigerant liquid is separated from the gas when colliding with the top baffle 370 and returns to the second heat exchange tube group 302, or flows along the guide sections 372 and 373 of the top baffle 370 to the outside of the first side baffle 311 and the second side baffle 312.

[0053] The waist 343 and the waist 348 are substantially flush with the center position of the second heat exchange tube group 302, which can not only ensure the heat exchange effect of the heat exchange tubes below the center position of the second heat exchange tube group 302, but also ensure that a certain amount of heat exchange tubes are provided above the center position of the second heat exchange tube group 302, thereby reducing the liquid content of the refrigerant flowing out of the second heat exchange tube group 302.

[0054] In the present application, in this embodiment, the arrangement of the first side baffle 311 and the second side baffle 312 makes the heat exchange efficiency of the refrigerant higher, and the liquid level of the refrigerant only needs to be kept flush with the height of the first heat exchange tube group 301, which can save a certain amount of refrigerant. Due to the arrangement of the waist 343 and the waist 348, the flow of the fluid for heat exchange in the second heat exchange tube group 302 has two stages of acceleration and deceleration. The acceleration stage is conducive to the fluid flowing to a higher height, and the deceleration stage is conducive to the separation of gas and liquid in the fluid. The first side baffle 311 and the second side baffle 312 with the waist 343 and the waist 348 can improve the heat exchange efficiency of the fluid in the second heat exchange tube group 302.

[0055] Figure 4A yes Figure 3A A schematic diagram of the middle extension. Figure 4B yes Figure 3A Another schematic diagram of the middle extension.

[0056] like Figure 4A As shown, the liquid return opening 385 is a hole 486 that passes through the extension portion 323. Figure 4B As shown, the liquid return opening 385 is a notch 487 recessed inward from the edge of the extension portion 323 .

[0057] Figure 5 is a cross-sectional view of the evaporator of the second embodiment of the present application, and Figure 3A The embodiment shown is similar, except that the shapes of the first side baffle 511 and the second side baffle 512 are different. Figure 5 In the illustrated embodiment, the first side baffle 511 includes a main body 521 and an extension 523, wherein the main body 521 includes a first portion 551 and a second portion 552, wherein the extension portion 523 extends in the same direction as the second portion 552 and no longer forms an angle with the second portion 552. The distal end of the extension portion 523 extends downward beyond the upper portion 518 of the first heat exchange tube group 501. Similarly, the second side baffle 512 includes a main body 522 and an extension 524, wherein the main body 522 includes a first portion 556 and a second portion 557, wherein the extension portion 524 extends in the same direction as the second portion 557 and no longer forms an angle with the second portion 557. The distal end of the extension portion 524 extends downward beyond the upper portion 518 of the first heat exchange tube group 501. During operation of this embodiment, the refrigerant liquid level is substantially flush with the upper portion 515 of the first heat exchange tube group 501 , and therefore, a portion of the extension portion 523 and the extension portion 524 may be immersed in the first heat exchange tube group 501 .

[0058] Figure 5 The first side guard 511 and the second side guard 512 of the embodiment shown have waist portions 543 and 548, which can achieve the same Figure 3A The embodiment shown has similar technical effects.

[0059] Figure 6 is a cross-sectional view of an evaporator of the third embodiment of the present application, and Figure 5 The embodiment shown is similar, except that the top baffle 670, the first side baffle 611 and the second side baffle 612 have different shapes. Figure 6In the illustrated embodiment, in the radial cross section, the first side baffle 611 and the second side baffle 612 are in the shape of a curve, and the waists 643 and 648 are the closest parts of the two curves. That is, there is a smooth transition between the main body 621 and the extension 623 of the first side baffle 611, and there is a smooth transition between the first part 651 and the second part 652 of the main body 621. There is a smooth transition between the main body 622 and the extension 624 of the second side baffle 612, and there is a smooth transition between the first part 656 and the second part 657 of the main body 622.

[0060] Similarly, the cross section of the top baffle 670 is also arc-shaped, that is, there is a smooth transition between the outlet section 671 and the guide sections 672 and 673 .

[0061] Figure 6 The first side guard 611 and the second side guard 612 of the embodiment shown have waist portions 643 and 648, which can achieve the same Figure 3A The embodiment shown has similar technical effects.

[0062] Figure 7 is a cross-sectional view of an evaporator of the fourth embodiment of the present application, and Figure 6 The embodiment shown is similar, except that Figure 7 The embodiment in also includes demister baffles 701 and 703. The demister baffles 701 and 703 are respectively arranged between the distal ends of both sides of the top baffle 770 and the shell 201 to connect the distal end of the top baffle 770 to the shell 201. The demister baffles 701 and 703 close the distance between the distal end of the top baffle 770 and the shell 201, and the fluid flowing out of the second heat exchange tube group 702 needs to pass through the demister baffles 701 and 703 to flow to the refrigerant outlet 212. The demister baffles 701 and 703 are porous flat plates that can prevent a portion of droplets from passing through. The demister baffles 701 and 703 extend upwardly and obliquely from the distal end of the top baffle 770 to facilitate guiding the liquid fluid back to the heat exchange tube group.

[0063] Figure 7 The first side guard 711 and the second side guard 712 of the embodiment shown have waist portions 743 and 748, which can achieve Figure 3A The embodiment shown has similar technical effects. Figure 7 The demisting baffle can further reduce the liquid content of the fluid flowing to the refrigerant outlet 212.

[0064] Figure 8 is a cross-sectional view of an evaporator of the fifth embodiment of the present application, and Figure 7 The embodiment shown is similar, except that Figure 8The connection positions of the demister baffles 801 and 802 and the top baffle 870 in the embodiment are different. The demister baffles 801 and 802 are connected to the ends of the outlet section of the top baffle 870 and the housing 201. Further, the connection positions of the demister baffles 801 and 802 and the top baffle 870 can be any positions of the top baffle 870, as long as the interval between the top baffle 870 and the housing 201 is closed.

[0065] Figure 8 The first side guard 811 and the second side guard 812 of the embodiment shown have waist portions 843 and 848, which can achieve Figure 3A The embodiment shown has similar technical effects. Figure 8 The demisting baffle can further reduce the liquid content of the fluid flowing to the refrigerant outlet 212.

[0066] Fig. 9 is a cross-sectional view of an evaporator of the sixth embodiment of the present application, and Figure 8 The embodiment shown is similar, except that Fig. 9 The position of the demister baffle 901 in the embodiment is different. In the height direction of the cavity, the demister baffle 901 is arranged above the top baffle 970, that is, between the refrigerant outlet 212 and the top baffle 970. The edge of the demister baffle 901 is connected to the inner wall of the shell 201, and the fluid entering the refrigerant outlet 212 needs to pass through the demister baffle 901.

[0067] Fig. 9 The first side guard 911 and the second side guard 912 of the embodiment shown have waist portions 943 and 948, which can achieve the same Figure 3A The embodiment shown has similar technical effects. Fig. 9 The demisting baffle can further reduce the liquid content of the fluid flowing to the refrigerant outlet 212.

[0068] Fig.10 is a cross-sectional view of the evaporator of the seventh embodiment of the present application, and Figure 6 The embodiment shown is similar, except that Fig.10 The embodiment in no longer has a top baffle and a baffle. Fig.10 Examples and Figure 6 Compared with the embodiment of the present invention, the second heat exchange tube group 1002 has more rows. In other words, the number of heat exchange tubes is greater. The heat exchange tubes at the top of the second heat exchange tube group 1002 can function as a top baffle and a demisting baffle to reduce the liquid content of the fluid.

[0069] Fig.10 The first side guard 1011 and the second side guard 1012 of the embodiment shown have waist portions 1043 and 1048, which can achieve Figure 3AThe embodiment shown has similar technical effects.

[0070] Although the present disclosure has been described in conjunction with the examples of the embodiments summarized above, various alternatives, modifications, variations, improvements and / or substantially equivalent solutions, whether known or currently or foreseeable in the near future, may be apparent to those skilled in the art who have at least ordinary skills. In addition, the technical effects and / or technical problems described in this specification are exemplary rather than restrictive; so the disclosure in this specification may be used to solve other technical problems and have other technical effects. Therefore, various changes may be made without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to include all known or earlier developed alternatives, modifications, variations, improvements and / or substantially equivalent solutions.

Claims

1. An evaporator, characterized in that include: A shell having a cavity and a refrigerant inlet and a refrigerant outlet communicated with the cavity, wherein the cavity has a length direction, a width direction and a height direction; a first heat exchange tube group and a second heat exchange tube group, wherein each heat exchange tube in the first heat exchange tube group and the second heat exchange tube group extends along the length direction of the cavity, the first heat exchange tube group is located at the lower part of the cavity, and the second heat exchange tube group is located above the first heat exchange tube group; a first side baffle and a second side baffle, the first side baffle and the second side baffle are respectively arranged on both sides of the second heat exchange tube group in a width direction, and the first side baffle and the second side baffle are configured to guide the refrigerant flowing out of the first heat exchange tube group to flow to the second heat exchange tube group; Wherein, each of the first side baffle and the second side baffle includes a main body portion, which is arranged adjacent to the second heat exchange tube group, and the main body portion includes a top and a bottom that are relatively arranged, and a waist portion located between the top and the bottom, and the spacing between the waist portions of the first side baffle and the second side baffle is smaller than the spacing between the top portions, and smaller than the spacing between the bottom portions.

2. The evaporator according to claim 1, characterized in that: In the height direction, one end of the first side baffle and the second side baffle extends beyond the second heat exchange tube group, and the other end extends to the inner wall of the shell.

3. The evaporator according to claim 1, characterized in that: The shape of the main body matches the shape of the second heat exchange tube group, the bottom of the main body is arranged toward the first heat exchange tube group, the spacing between the bottoms of the main bodies of the first side baffle and the second side baffle is W21, the spacing between the tops is W22, and the spacing between the waists is W23, wherein W21≥W22>W23.

4. The evaporator according to claim 3, characterized in that: The main body includes a first part and a second part, the first part extends from the top of the main body to the waist, and the second part extends from the bottom of the main body to the waist, the cross-sections of the first part and the second part are straight lines, and the angle between the first part and the second part is between 100° and 170°.

5. The evaporator according to claim 3, characterized in that: The cross sections of the main bodies of the first side baffle and the second side baffle are hyperbolic.

6. The evaporator according to claim 3, characterized in that: Each of the first side baffle and the second side baffle includes an extending portion connected to the bottom of the main body and extending to an inner wall of the housing along a width direction of the cavity.

7. The evaporator according to claim 3, characterized in that: The evaporator also includes a top baffle, which includes an outlet section and a pair of guide sections. The outlet section is arranged above the second heat exchange tube group and has a distance between the first side baffle and the second side baffle. The pair of guide sections are respectively connected to the two ends of the outlet section, and extend obliquely downward toward the inner wall of the shell and have a distance between the inner wall of the shell. In the height direction of the cavity, the distal ends of the pair of guide sections are lower than the tops of the main bodies of the first side baffle and the second side baffle.

8. The evaporator according to claim 3, characterized in that: In the width direction of the cavity, the maximum width of the first heat exchange tube group is greater than the maximum width of the second heat exchange tube group; the evaporator is configured so that the liquid level of the refrigerant submerges the first heat exchange tube group; a liquid return opening is provided on the first side baffle and the second side baffle, and the height of the liquid return opening is higher than the height of the first heat exchange tube group.

9. The evaporator according to claim 7, characterized in that: The evaporator further includes a defogger baffle, which is disposed between the top baffle and the shell to cover the gap between the top baffle and the shell; or disposed between the top baffle and the refrigerant outlet to cover the refrigerant outlet.

10. The evaporator according to claim 1, characterized in that: The refrigerant inlet is adjacent to the lower portion of the first heat exchange tube group, and the height of the refrigerant outlet is higher than the height of the second heat exchange tube group.

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