Evaporator and air conditioning system with same

Abstract

The invention provides an evaporator and an air conditioning system with the evaporator. The evaporator comprises a plurality of heat exchange coil pipes, a liquid separator and a gas collecting pipe, the liquid separator and the gas collecting pipe are communicated with the two ends of the heat exchange coil pipes, and a limiting guide rod and a plurality of branch floating plugs in sliding connection with the limiting guide rod are arranged in the gas collecting pipe. Each branch floating plug is provided with a plugging position which is in contact with the outlet and forms plugging and a through-flow position which is separated from the outlet; and each branch floating plug can sequentially rise along the guide direction of the limiting guide rod under the buoyancy action of accumulated liquid at the bottom of the gas collecting pipe and is switched from the through-flow position to the plugging position so as to at least plug the lower pipe orifice in each heat exchange coil pipe from bottom to top. According to the heat exchanger, liquid refrigerants can be evenly distributed in the height direction of the heat exchange core part, on one hand, accumulated liquid in the gas collecting pipe can be slowed down, the flow resistance of the gas refrigerants can be reduced, and smooth operation of other components of a follow-up system is facilitated; and the overheating phenomenon of the upper coil pipe is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to an evaporator and an air conditioning system having the same. Background Art

[0002] In the refrigeration and air-conditioning system, the refrigerant at the evaporator inlet is generally in a gas-liquid two-phase state with a relatively low dryness. In recent years, with the emergence of new refrigeration systems, the refrigerant state at the evaporator inlet can still be in the liquid phase. Therefore, even if the refrigerant is distributed as evenly as possible to each pipeline (i.e., coil) through a liquid separator before the evaporator inlet, there will still be differences in the refrigerant flow in each coil during actual operation, and the difference will be more obvious as the dryness of the evaporator inlet decreases, resulting in the evaporator having a larger flow rate and liquid at the outlet at the lower coil, and a smaller flow rate and severe overheating at the upper coil. That is, the refrigerant is unevenly distributed in each coil (from bottom to top), the heat exchange capacity of the evaporator cannot be fully utilized, and liquid will accumulate at the bottom of the collecting pipe, increasing the flow resistance of the gaseous refrigerant, which is not conducive to the smooth operation of other subsequent system components. Summary of the invention

[0003] Therefore, the present invention provides an evaporator and an air-conditioning system having the same, which can overcome the technical problems in the prior art that the refrigerant is unevenly distributed in each coil of the evaporator, the heat exchange capacity of the evaporator cannot be fully utilized, and there is liquid accumulation at the bottom of the collecting pipe, which increases the flow resistance of the gaseous refrigerant and is not conducive to the smooth operation of other components of the subsequent system.

[0004] In order to solve the above problems, the present invention provides an evaporator, comprising a plurality of heat exchange coils, a liquid distributor connected to the inlet of each of the heat exchange coils, and an air collecting pipe connected to the outlet of each of the heat exchange coils, the air collecting pipe being provided with a limiting guide rod extending along the height direction of the air collecting pipe and a plurality of branch floats slidably connected to the limiting guide rod, each of the branch floats having a blocking position in contact with the outlet and forming a blockage and a flow position detached from the outlet, each of the branch floats being able to rise in sequence along the guiding direction of the limiting guide rod under the action of the buoyancy of the accumulated liquid at the bottom of the air collecting pipe, and switching from the flow position to the blocking position so as to at least achieve the bottom-up blocking of the lower pipe openings in each of the heat exchange coils.

[0005] In some embodiments, the branch float is truncated cone-shaped, the small-area end face of the truncated cone is arranged opposite to the corresponding outlet, the diameter of the small-area end face is smaller than the diameter of the outlet, and the diameter of the large-area end face is larger than the diameter of the outlet.

[0006] In some embodiments, a vertical float is further provided in the gas collecting pipe, and the vertical float is slidably connected to the limiting guide rod. There are multiple branch floats, and the multiple branch floats are slidably connected to the vertical float at intervals along the length direction of the limiting guide rod. The vertical float is also fixed with a baffle rod corresponding to each branch float, and each baffle rod is located below the corresponding branch float.

[0007] In some embodiments, when there is no liquid accumulation in the gas collecting pipe, the position of the vertical float is the initial position. When the vertical float is in the initial position, the height distance between the corresponding blocking rods and the branch floats becomes larger and larger from the bottom to the top of the limiting guide rod; and when the vertical float is in the initial position, each branch float is below the corresponding outlet.

[0008] In some embodiments, a floating limiter is further provided in the gas collecting pipe, and the floating limiter divides the gas collecting pipe into an upper chamber and a lower chamber. The floating limiter has a plurality of first flow holes passing through the upper chamber and the lower chamber. The top of the vertical float is provided with an end plate. When the vertical float rises to the highest position under the buoyancy of the accumulated liquid, the end plate can fit with the bottom side surface of the floating limiter and at least partially block the first flow holes. The gaseous fluids at the upper and lower ends of the end plate can be connected, and each of the branch floats has a second flow hole passing through its upper and lower end surfaces.

[0009] In some embodiments, the maximum diameter of the end plate is smaller than the gas collecting pipe to form an annular gap therebetween, and the end plate has a third flow hole passing through both end surfaces thereof; and / or, the top end of the limit guide rod is connected to the floating limit member, and the bottom end of the limit guide rod is connected to the bottom wall of the gas collecting pipe.

[0010] In some embodiments, the maximum diameter of the end plate is smaller than the maximum diameter of the floating limit member, and when the end plate is in contact with the bottom side of the floating limit member, the first flow holes at the positions corresponding to the annular gap are in a connected state, and the remaining first flow holes are cut off by the end plate.

[0011] In some embodiments, when each of the branch floats is in the blocking position, the total flow area of ​​the second flow holes on each of the branch floats is Sa, the flow area of ​​the outlet is Sb, 70%≤(Sb-Sa) / Sb≤90%; and / or the floating limiter and / or the end plate is a conical shell.

[0012] In some embodiments, the aperture of each of the second flow holes on each of the branch floats increases from the inside to the outside along the diameter direction of the branch float; and / or the aperture of each of the first flow holes and / or the third flow holes increases from the inside to the outside along the diameter direction of the limiting guide rod.

[0013] In some embodiments, the circumferential displacement of the vertical float is limited by being sleeved on the radial outer side of the limiting guide rod; and / or the branch float has a connecting column, and the circumferential displacement of the connecting column is limited by being sleeved on the radial outer side of the vertical float.

[0014] In some embodiments, the cross-sections of the vertical float and the limiting guide rod are polygons with matching shapes; and / or the cross-sections of the connecting ring of the connecting column and the vertical float are polygons with matching shapes.

[0015] The present invention also provides an air conditioning system, including an evaporator and a compressor, wherein the evaporator is the aforementioned evaporator, and the top air outlet of the air collecting pipe of the evaporator is connected to the air intake of the compressor through an air intake pipe.

[0016] An evaporator and an air conditioning system having the same provided by the present invention have the following beneficial effects:

[0017] By arranging a branch float corresponding to the outlet of the heat exchange coil in the gas collecting pipe, when the refrigerant in the heat exchange coil is unevenly distributed, resulting in uneven heat exchange of the refrigerant, it will flow out in liquid form at the outlet of the heat exchange coil and form liquid accumulation at the bottom of the gas collecting pipe. The accumulated liquid forms a buoyancy for the branch float in contact with it to rise. As the height of the accumulated liquid increases, the branch float eventually forms a blockage of the corresponding outlet, thereby allowing the liquid refrigerant in the liquid distributor to flow more to the upper area of ​​the heat exchange core, which is beneficial to the uniform distribution of the liquid refrigerant in the height direction of the heat exchange core. On the one hand, it can slow down the accumulation of liquid in the gas collecting pipe and reduce the flow resistance of the gaseous refrigerant, which is beneficial to the smooth operation of other components of the subsequent system. On the other hand, since more liquid refrigerant is guided to the upper heat exchange coil, the overheating phenomenon of the upper coil is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 is a schematic structural diagram of an evaporator according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0022] Figure 4 yes Figure 1 A schematic cross-sectional view of the neutral float and the limit guide rod in the assembled state;

[0023] Figure 5 yes Figure 1 Bottom view of the neutral float and the limit guide rod in the assembled state;

[0024] Figure 6 1 is a schematic diagram of the system principle of an air conditioning system according to another embodiment of the present invention.

[0025] The accompanying drawings are marked as follows:

[0026] 11. heat exchange coil; 12. liquid distributor; 13. gas collecting pipe; 21. limit guide rod; 22. branch float plug; 221. second flow hole; 222. connecting column; 23. vertical float; 231. baffle rod; 232. end plate; 2321. third flow hole; 3. floating limiter; 31. first flow hole; 100. evaporator; 101. compressor; 102. suction pipe; 103. condenser; 1031. gas distributor; 1032. liquid collecting pipe; 104. throttling element. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0030] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0031] See also Figure 1 and Figure 6 As shown, according to an embodiment of the present invention, an evaporator is provided, comprising a plurality of heat exchange coils 11, a liquid distributor 12 connected to the inlet of each of the heat exchange coils 11, and an air collecting pipe 13 connected to the outlet of each of the heat exchange coils 11. It can be understood that the aforementioned heat exchange coils 11 are arranged in parallel with each other to form a heat exchange core, the liquid distributor 12 and the air collecting pipe 13 are respectively located on the left and right sides of the heat exchange core, and the air collecting pipe 13 is provided with a limiting guide rod 21 extending along the height direction of the air collecting pipe 13 and a plurality of branch floats 22 slidably connected to the limiting guide rod 21, and each of the branch floats 22 has a blocking position that contacts with the outlet and forms a blockage. The branch floats 22 are positioned in a flow position separated from the outlet, and under the action of the buoyancy of the accumulated liquid at the bottom of the gas collecting pipe 13, each of the branch floats 22 can rise in sequence along the guiding direction of the limiting guide rod 21 and switch from the flow position to the blocking position so as to at least achieve the bottom-up blocking of the pipe openings at the bottom of each of the heat exchange coils 11. It should be noted that the aforementioned bottom-up blocking refers to starting from the heat exchange coil 11 at the bottom of the heat exchange core. As the height of the accumulated liquid increases, each of the branch floats 22 floats up from bottom to top in sequence under the action of buoyancy and finally switches from the flow position to the blocking position in sequence to achieve the blocking of each pipe opening corresponding to its position.

[0032] In this technical solution, a branch float 22 corresponding to the outlet of the heat exchange coil 11 is arranged in the gas collecting pipe 13. When the refrigerant in the heat exchange coil 11 is unevenly distributed, resulting in uneven heat exchange of the refrigerant, it will flow out in liquid form at the outlet of the heat exchange coil 11 and form liquid accumulation at the bottom of the gas collecting pipe 13. The accumulated liquid forms a buoyancy for the branch float 22 in contact with it to rise. As the height of the accumulated liquid increases, the branch float 22 eventually forms a blockage of the corresponding outlet, thereby allowing the liquid refrigerant in the liquid separator 12 to flow more toward the upper area of ​​the heat exchange core, which is beneficial to the uniform distribution of the liquid refrigerant in the height direction of the heat exchange core. On the one hand, it can slow down the accumulation of liquid in the gas collecting pipe 13, reduce the flow resistance of the gaseous refrigerant, and facilitate the smooth operation of other components of the subsequent system. On the other hand, since more liquid refrigerant is guided into the upper heat exchange coil 11, the overheating phenomenon of the upper coil is improved.

[0033] In some embodiments, the branch float 22 is truncated cone-shaped, the small-area end face of the truncated cone is arranged opposite to the corresponding outlet, the diameter of the small-area end face is smaller than the diameter of the outlet, and the diameter of the large-area end face is larger than the diameter of the outlet.

[0034] See Figure 2 As shown, the aforementioned branch float 22 can be a truncated cone-shaped shell. When it is in the blocking position, its outer conical surface can contact the outlet edge of the heat exchange coil 11 to form a blockage for the outlet. The outer conical surface can guide the position switching of the branch float 22 to ensure smooth and accurate position switching.

[0035] It should be noted that, in specific applications, each of the branch floats 22 can be slidably sleeved on the outer peripheral wall of the aforementioned limiting guide rod 21 via the corresponding connecting column 222. At this time, each of the branch floats 22 needs to come into contact with the accumulated liquid, and then use the buoyancy of the accumulated liquid to achieve its own lifting and lowering. That is, the branch float 22 should be made of a material that can enable it to float on the accumulated liquid, such as rubber, foam, etc.

[0036] In another preferred embodiment, a vertical float 23 is further provided in the gas collecting pipe 13. The vertical float 23 is a float that can follow the height of the accumulated liquid and rise and fall along the height direction. The vertical float 23 is slidably connected to the limit guide rod 21, and there are multiple branch floats 22. The multiple branch floats 22 are slidably connected to the vertical float 23 at intervals along the length direction of the limit guide rod 21, and the vertical float 23 is also fixed with a baffle 231 corresponding to each branch float 22. Each baffle 231 is located below the corresponding branch float 22. Each baffle 231 can be a structure integrally formed with the vertical float 23, or an independent component assembled with the vertical float 23, which can limit the branch floats 22 arranged at intervals above and below to a position near the outlet of each heat exchange coil 11 corresponding to each branch float 22, so as to ensure the one-to-one correspondence between each branch float 22 and the heat exchange coil 11. The aforementioned sliding connection is, for example, a gap sleeve connection between the two.

[0037] In this technical solution, each branch float 22 is slidably connected to the vertical float 23, and each baffle rod 231 below each branch float 22 is arranged on the vertical float 23 at intervals in the vertical direction thereof, so that the position switching of each branch float 22 is realized by the floating of the vertical float 23, and each branch float 22 corresponds to the outlet of each heat exchange coil 11 one by one and is limited to a position below each corresponding outlet, thereby ensuring a one-to-one correspondence between each branch float 22 and each outlet, simplifying the structural design, and ensuring the blocking response speed of each branch float 22 to the outlet of each heat exchange coil 11.

[0038] In some embodiments, when there is no liquid accumulation in the gas collecting pipe 13, the position of the vertical float 23 is the initial position. When the vertical float 23 is in the initial position, from the bottom to the top of the limiting guide rod 21, the height distance between each corresponding blocking rod 231 and the branch float 22 becomes larger and larger; and when the vertical float 23 is in the initial position, each branch float 22 is below the corresponding outlet, and there is a height gap between the two.

[0039] In this technical solution, based on the fact that the heat exchange coil 11 closer to the bottom of the evaporator is more likely to accumulate liquid, the height distance between the blocking rod 231 and the corresponding branch float plugs 22 is made larger from bottom to top, that is, smaller from top to bottom, to ensure that each branch float plug 22 can block the liquid at the outlet more quickly under the drive of the vertical float 23.

[0040] See also Figure 1 and Figure 3As shown, in some embodiments, a floating limiter 3 is further provided in the gas collecting pipe 13, and the floating limiter 3 divides the gas collecting pipe 13 into an upper chamber and a lower chamber. The floating limiter 3 has a plurality of first flow holes 31 passing through the upper chamber and the lower chamber. The top of the vertical float 23 is provided with an end plate 232. When the vertical float 23 rises to the highest position under the buoyancy of the accumulated liquid, the end plate 232 can fit with the bottom side surface of the floating limiter 3 and at least partially block the first flow hole 31. The gaseous fluids at the upper and lower ends of the end plate 232 can be connected, and each of the branch floats 22 has a second flow hole 221 passing through its upper and lower end surfaces.

[0041] In this technical solution, the gas collecting pipe 13 is divided into an upper chamber and a lower chamber by the aforementioned floating limit member 3, wherein the top surface of the upper chamber is the top air outlet of the gas collecting pipe 13, and when the end plate 232 on the top end of the vertical float 23 fits with the bottom side of the floating limit member 3, the connecting flow area between the upper chamber and the lower chamber is reduced, and the air flow pressure in the lower chamber will increase at this time. At this time, it can be understood that each branch float plug 22 on the vertical float 23 is respectively in a state of blocking the outlet of each heat exchange coil 11, that is, each branch float plug 22 is in a blocking position, and since the technical solution also provides a second flow hole 221 passing through the upper and lower sides of each branch float plug 22, as the pressure in the lower chamber increases, the accumulated liquid will reversely enter the heat exchange coil 11 in contact with the accumulated liquid through each second flow hole 221, which objectively increases the heat exchange pipe process of the liquid refrigerant. , which can realize the full heat exchange and gasification of liquid refrigerant, thereby reducing the amount of liquid accumulated at the bottom of the gas collecting pipe 13, that is, the liquid level in the gas collecting pipe 13 will be reduced, and the vertical float 23 will also drop accordingly, and the flow area between the upper chamber and the lower chamber will increase, and the gaseous refrigerant will enter the upper chamber from the lower chamber and smoothly discharge the gas collecting pipe 13, that is, in this technical solution, with the increase of the liquid level, the actual flow area through the floating limiter 3 will decrease accordingly, and the pressure in the lower chamber of the gas collecting pipe 13 will increase. Under the action of this pressure, the accumulated liquid will flow toward the side of the liquid distributor 12 through each heat exchange coil 11 below the liquid level, so that the accumulated liquid returns to the heat exchange core of the evaporator again, improving the pipe path of the refrigerant and making the heat exchange more sufficient. The accumulated liquid will absorb heat and gasify, and the accumulated liquid can be prevented from continuing to increase without discharging the accumulated liquid from the gas collecting pipe 13. At the same time, it can be understood that in the present invention, the accumulated liquid is returned to the heat exchange core of the evaporator again, which also increases the circulation amount of the refrigerant.

[0042] In some embodiments, the maximum diameter of the end plate 232 is smaller than the gas collecting pipe 13 to form an annular gap (not marked in the figure) therebetween, and the end plate 232 has a third flow hole 2321 passing through its two end surfaces, thereby ensuring that when the end plate 232 and the floating limit member 3 are not in contact with each other, the gas flow area in the lower cavity of the gas collecting pipe 13 is relatively large, thereby ensuring the heat exchange effect of the evaporator.

[0043] In a specific embodiment, the top end of the limit guide rod 21 is connected to the floating limit member 3, and the bottom end of the limit guide rod 21 is connected to the bottom wall of the gas collecting pipe 13. That is, the floating limit member 3 can not only separate the upper cavity and the lower cavity of the gas collecting pipe 13, but also position the top end of the limit guide rod 21, thereby ensuring the bending resistance of the limit guide rod 21 and ensuring the smoothness of the lifting and lowering of the vertical float 23.

[0044] In some embodiments, the maximum diameter of the end plate 232 is smaller than the maximum diameter of the floating limit member 3, and when the end plate 232 is in contact with the bottom side of the floating limit member 3, the first flow holes 31 at the corresponding position of the annular gap are in a connected state, and the remaining first flow holes 31 are cut off by the end plate 232. At this time, it can be understood that when the vertical float 23 rises to the highest position, that is, when the accumulated liquid level reaches the highest point, the end plate 232 will block the first flow holes 31 in the fitting contact area, and the upper chamber and the lower chamber are connected only through the first flow holes 31 in the aforementioned annular gap, which can ensure the rapid increase of pressure in the lower chamber and thus ensure that the accumulated liquid is more efficiently driven back to the heat exchange core of the evaporator for heat exchange and vaporization again.

[0045] In a specific embodiment, the projections of the first flow hole 31 and the third flow hole 2321 on the horizontal plane when the end plate 232 and the floating limiter 3 are in a state of being in fit form a staggered arrangement, that is, there is no overlapping part, so as to achieve the purpose of air flow through the third flow hole 2321 when the end plate 232 is not in the highest position and the purpose of blocking the first flow hole 31 when it is in the highest position.

[0046] Continue to see Figure 3 As shown, in a specific embodiment, the floating limit member 3 and / or the end plate 232 is a conical shell, and each first flow hole 31 and the third flow hole 2321 are respectively formed on the outer conical surface of the conical shell. The aforementioned floating limit member 3 and the end plate 232 are respectively designed as conical shells with matching shapes to ensure that the solid part of the end plate 232 accurately corresponds to the position of each first flow hole 31 on the floating limit member 3 when the two are fitted, thereby ensuring that blocking is achieved.

[0047] In some embodiments, when each of the branch floats 22 is in the blocking position, the total flow area of ​​the second flow holes 221 on each of the branch floats 22 is Sa, and the flow area of ​​the outlet is Sb, 70%≤(Sb-Sa) / Sb≤90%; further, along the diameter direction of the branch float 22 from inside to outside, the aperture of each of the second flow holes 221 on each of the branch floats 22 becomes larger and larger, that is, the aperture of each of the second flow holes 221 close to the center area on each branch float 22 is smaller, and the aperture of each of the second flow holes 221 close to the outer edge is larger, so that when the branch float 22 is not in contact with the outlet, it can have a better liquid blocking effect, and when each branch float 22 is in contact with the outlet, that is, when the vertical float 23 is in the highest position and the accumulated liquid refluxes, it can have a larger flow rate. In a preferred embodiment, along the diameter direction of the limiting guide rod 21 from inside to outside, the aperture of each of the first through-flow holes 31 and / or the third through-flow holes 2321 becomes larger and larger.

[0048] In some embodiments, the circumferential displacement of the vertical float 23 is limited by being sleeved on the radial outer side of the limiting guide rod 21; and / or, the branch float 22 has a connecting column 222, and the circumferential displacement of the connecting column 222 is limited by being sleeved on the radial outer side of the vertical float 23, so as to ensure that each branch float 22 can accurately correspond to the outlet of each heat exchange coil 11 up and down. Specifically, the cross-sections of the vertical float 23 and the limiting guide rod 21 are polygons with matching shapes, see Figure 4 As shown, both are square; similarly, the connecting ring of the connecting column 222 and the cross section of the vertical float 23 are polygonal shapes that match each other.

[0049] In this technical solution, the cross-sections of the two parts that are mutually sleeved and matched are designed to be polygonal, and the anti-rotation design of the two parts in the circumferential direction is achieved through the edges and corners of the polygon, so the structure is simple.

[0050] The working states of the vertical float 23 and the branch float 22 are divided into four situations according to the height of the liquid level in the gas collecting pipe 13:

[0051] 1. When there is no liquid in the gas collecting pipe 13, the bottom of the vertical float 23 is close to the bottom of the gas collecting pipe 13 under the action of gravity, and the maximum gas flow area is between the ventilation cone surface at the top of the vertical float 23 (that is, the aforementioned floating limiter 3, the same below) and the cone surface at the top of the fixed shaft (that is, the aforementioned limit guide rod 21, the same below) (that is, the aforementioned end plate 232, the same below), and the bottom of each branch float 22 nested on the vertical float 23 is close to its lower baffle (that is, the aforementioned baffle rod 231, the same below).

[0052] 2. When the liquid level in the collecting pipe 13 is lower than the lowest coil outlet height of the evaporator, the vertical float 23 floats up and drives the first branch float 22 from bottom to top to move up, that is, the bottom branch float 22. Because its lower baffle is set at the shortest distance from the bottom coil outlet of the evaporator, the bottom coil outlet area of ​​the evaporator is reduced and the liquid outlet resistance is increased. At the same time, as the vertical float 23 floats up, the gas flow area between its top ventilation cone and the top fixed ventilation cone surface of the fixed axis is reduced, and the gas resistance is increased. The combined effect of the two promotes the upward distribution of the refrigerant flow at the evaporator inlet, so that the refrigerant in the evaporator is fully exchanged with heat, and finally the liquid level in the collecting pipe is reduced, the vertical float floats down, the gas flow area at the top of the collecting pipe is increased, and the gas is discharged smoothly from the collecting pipe.

[0053] 3. When the liquid level in the gas collector is higher than the outlet height of the first evaporator coil measured from bottom to top and lower than the outlet height of the second coil, the vertical float continues to float up, and at the same time drives the first branch float plug to move up to the set maximum liquid blocking area, and drives the second branch float plug to move up to the second evaporator coil outlet, and the cross-section is reduced. At the same time, the gas flow area between the top ventilation cone of the vertical float and the top fixed ventilation cone of the fixed axis continues to decrease, and the gas resistance increases more, forcing the liquid in the gas collector to return to the evaporator through the first coil outlet of the evaporator submerged by the liquid level, and continue to participate in heat exchange. The combined effect of the two promotes the distribution of the evaporator inlet flow to the upper branch, and the refrigerant fully exchanges heat, which eventually reduces the liquid level in the gas collector, floats down, and the gas flow area of ​​the top fixed ventilation cone becomes larger, and the gas is discharged smoothly from the gas collector. By analogy, this situation can be applied to the situation where the liquid level continues to rise to other heights until the liquid level rises and drives the vertical float to reach the maximum height, which is the fourth situation below.

[0054] 4. When the evaporator outlet branch is seriously filled with liquid, the liquid level in the gas collecting pipe continues to rise, driving the vertical float to float to the maximum height, that is, when the upper surface of the top ventilation cone of the vertical float coincides with the lower surface of the top fixed cone of the fixed shaft, the gas flow area at the top of the gas collecting pipe reaches the minimum, and the vertical float and the branch float plug submerged by the liquid level no longer move. However, since the branch distribution structure is also movably nested and installed on the vertical float, the branch float plug that is not submerged can continue to move upward with the rise of the liquid level, completing the blocking of the outlet of the liquid-carrying coil and optimizing the evaporator flow distribution. Finally, the liquid level in the gas collecting pipe is lowered, the vertical float floats downward, the gas flow area of ​​the top fixed ventilation cone becomes larger, and the gas is discharged from the gas collecting pipe smoothly.

[0055] According to an embodiment of the present invention, an air conditioning system is also provided. Figure 6As shown, it includes an evaporator 100, a compressor 101, a condenser 103 and a throttling element 104 (for example, an electronic expansion valve). The evaporator 100 is the aforementioned evaporator, and the top air outlet of the collecting pipe 13 of the evaporator 100 is connected to the air intake of the compressor 101 through the air intake pipe 102. That is, since the accumulated liquid in the collecting pipe of the evaporator in the present invention can be refluxed to the heat exchange core of the evaporator for heat exchange and vaporization again, the dryness of the refrigerant at the air outlet of the collecting pipe 13 can be ensured. Therefore, a gas-liquid separator is no longer set between the evaporator 100 and the compressor 101.

[0056] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An evaporator, comprising a plurality of heat exchange coils (11), a liquid distributor (12) connected to the inlet of each of the heat exchange coils (11), and a gas collecting pipe (13) connected to the outlet of each of the heat exchange coils (11), characterized in that: The gas collecting pipe (13) is provided with a limiting guide rod (21) extending along the height direction of the gas collecting pipe (13) and a plurality of branch floats (22) slidably connected to the limiting guide rod (21). Each branch float (22) has a blocking position in contact with the outlet to form a blockage and a flow position detached from the outlet. Under the buoyancy of the accumulated liquid at the bottom of the gas collecting pipe (13), each branch float (22) can rise in sequence along the guiding direction of the limiting guide rod (21) and switch from the flow position to the blocking position to at least achieve bottom-up blocking of the lower pipe opening of each heat exchange coil (11).

2. The evaporator according to claim 1, characterized in that The branch float (22) is truncated cone-shaped, the small-area end face of the truncated cone is arranged opposite to the outlet arranged corresponding thereto, the diameter of the small-area end face is smaller than the diameter of the outlet, and the diameter of the large-area end face is larger than the diameter of the outlet.

3. The evaporator according to claim 1, characterized in that A vertical float (23) is also provided in the gas collecting pipe (13), and the vertical float (23) is slidably connected to the limiting guide rod (21). There are a plurality of branch floats (22), and the plurality of branch floats (22) are slidably connected to the vertical float (23) at intervals along the length direction of the limiting guide rod (21). The vertical float (23) is also fixedly provided with a blocking rod (231) corresponding to each branch float (22), and each blocking rod (231) is located below the corresponding branch float (22).

4. The evaporator according to claim 3, characterized in that When there is no liquid accumulation in the gas collecting pipe (13), the position of the vertical float (23) is the initial position. When the vertical float (23) is in the initial position, the height distance between the corresponding blocking rods (231) and the branch float plugs (22) increases from the bottom to the top of the limiting guide rod (21); and when the vertical float (23) is in the initial position, each branch float plug (22) is located below the corresponding outlet.

5. The evaporator according to claim 4, characterized in that A floating stopper (3) is also provided in the gas collecting pipe (13), and the floating stopper (3) divides the gas collecting pipe (13) into an upper chamber and a lower chamber. The floating stopper (3) has a plurality of first flow holes (31) passing through the upper chamber and the lower chamber. The top end of the vertical float (23) is provided with an end plate (232). When the vertical float (23) rises to the highest position under the buoyancy of the accumulated liquid, the end plate (232) can fit with the bottom side of the floating stopper (3) and at least partially block the first flow holes (31). The gaseous fluids at the upper and lower ends of the end plate (232) can be connected, and each of the branch floats (22) has a second flow hole (221) passing through its upper and lower end surfaces.

6. The evaporator according to claim 5, characterized in that The maximum diameter of the end plate (232) is smaller than that of the gas collecting pipe (13) so as to form an annular gap therebetween, and the end plate (232) has a third flow hole (2321) passing through both end surfaces thereof; and / or the top end of the limit guide rod (21) is connected to the floating limit member (3), and the bottom end of the limit guide rod (21) is connected to the bottom wall of the gas collecting pipe (13).

7. The evaporator according to claim 6, characterized in that The maximum diameter of the end plate (232) is smaller than the maximum diameter of the floating limiter (3), and when the end plate (232) is in contact with the bottom side of the floating limiter (3), the first flow holes (31) at the positions corresponding to the annular gap are in a connected state, and the remaining first flow holes (31) are cut off by the end plate (232).

8. The evaporator according to claim 5, characterized in that When each of the branch floats (22) is in the blocking position, the total flow area of ​​the second flow holes (221) on each of the branch floats (22) is Sa, the flow area of ​​the outlet is Sb, and 70%≤(Sb-Sa) / Sb≤90%; and / or the floating limiter (3) and / or the end plate (232) is a truncated cone shell.

9. The evaporator according to claim 5, characterized in that From inside to outside along the diameter direction of the branch float (22), the aperture of each of the second flow holes (221) on each of the branch floats (22) becomes larger and larger; and / or, from inside to outside along the diameter direction of the limiting guide rod (21), the aperture of each of the first flow holes (31) and / or the third flow holes (2321) becomes larger and larger.

10. The evaporator according to claim 3, characterized in that The circumferential displacement of the vertical float (23) is limited by being sleeved on the radial outer side of the limiting guide rod (21); and / or the branch float (22) has a connecting column (222), and the circumferential displacement of the connecting column (222) is limited by being sleeved on the radial outer side of the vertical float (23).

11. The evaporator according to claim 10, characterized in that The cross sections of the vertical float (23) and the limiting guide rod (21) are polygons with matching shapes; and / or the cross sections of the connecting ring of the connecting column (222) and the vertical float (23) are polygons with matching shapes.

12. An air conditioning system, characterized in that: It comprises an evaporator (100) and a compressor (101), wherein the evaporator (100) is the evaporator according to any one of claims 1 to 11, and the top air outlet of the air collecting pipe (13) of the evaporator (100) is connected to the air intake port of the compressor (101) through an air intake pipe (102).

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