Evaporator and air conditioning system having the same

Abstract

The application provides an evaporator and an air conditioning system with the same, wherein the evaporator comprises a plurality of heat exchange coils, a distributor and a header connected to both ends of the heat exchange coils, the header is provided with a limiting guide rod and a plurality of branch floaters which are slidably connected to the limiting guide rod, each of the branch floaters has a blocking position in contact with the outlet and forming a blockage and a flow-through position away from the outlet, and each of the branch floaters can be lifted along the guiding direction of the limiting guide rod under the buoyancy of the liquid in the bottom of the header to switch from the flow-through position to the blocking position to at least achieve the bottom-up blockage of the lower pipe opening in each of the heat exchange coils. The application is beneficial to the uniform distribution of the liquid refrigerant in the height direction of the heat exchange core, on the one hand, can slow down the liquid accumulation in the header, reduce the flow resistance of the gaseous refrigerant, and is beneficial to the smooth operation of other parts of the subsequent system, on the other hand, more liquid refrigerant is guided into the upper heat exchange coil to improve the overheating phenomenon of the upper coil.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air conditioning technology, and particularly relates to an evaporator and an air conditioning system with the same. BACKGROUND

[0002] In a refrigeration and air conditioning system, the refrigerant at the inlet of the evaporator is generally in a gas-liquid two-phase state and has a small dryness. In recent years, with the emergence of new refrigeration systems, the refrigerant at the inlet of the evaporator can also be in a liquid phase region. Therefore, even if the refrigerant is evenly distributed to each tube (i.e. coil) through a distributor before the inlet of the evaporator, the refrigerant flow in each coil will still be different in actual operation, and the difference will be more obvious as the dryness at the inlet of the evaporator decreases, resulting in that the flow in the lower coil of the evaporator is larger and the outlet is liquid-carrying, and the flow in the upper coil is smaller and the superheat is serious, i.e. the refrigerant is not evenly distributed in each coil (from bottom to top), the heat exchange capacity of the evaporator cannot be fully utilized, and liquid accumulation at the bottom of the gas collector will increase the flow resistance of the gaseous refrigerant, which is not conducive to the smooth operation of other components of the subsequent system. SUMMARY

[0003] Therefore, the present application provides an evaporator and an air conditioning system with the same, which can overcome the technical problems in the prior art that the refrigerant is not evenly 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 gas collector, 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] To solve the above problems, the present application provides an evaporator, which comprises a plurality of heat exchange coils, a distributor connected to the inlets of the heat exchange coils, and a gas collector connected to the outlets of the heat exchange coils. The gas collector is provided with a limiting guide rod extending along the height direction of the gas collector and a plurality of branch floats slidably connected to the limiting guide rod. Each branch float has a blocking position in contact with the outlet to form a blockage and a flow-through position away from the outlet. Each branch float can be lifted along the guiding direction of the limiting guide rod by the buoyancy of the liquid accumulation at the bottom of the gas collector to switch from the flow-through position to the blocking position to at least block the tube openings in the lower heat exchange coils from bottom to top.

[0005] In some embodiments, the branch float is a circular truncated cone, the small-area end face of the circular truncated cone is arranged opposite to the outlet 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.

[0006] In some embodiments, the gas collecting pipe is further provided with a vertical float which is slidingly connected to the limiting guide rod, and the branch floats are provided in plurality and are slidingly connected to the vertical float along the length direction of the limiting guide rod, and the vertical float is further provided with a plurality of stop rods which are correspondingly arranged with the branch floats, and each stop rod is below the corresponding branch float.

[0007] In some embodiments, when the gas collecting pipe is free of liquid, the vertical float is in an initial position, and when the vertical float is in the initial position, the height distance between each stop rod and the corresponding branch float is gradually increased 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, the gas collecting pipe is further provided with an upper floating limiting member which separates the gas collecting pipe into an upper chamber and a lower chamber, and the upper floating limiting member is provided with a plurality of first flow-through holes which pass through the upper chamber and the lower chamber, the vertical float is provided with an end plate at the top end thereof, when the vertical float is lifted to the highest position under the floating force of the liquid, the end plate can be attached to the bottom side of the upper floating limiting member and at least partially block the first flow-through holes, the gaseous fluid at the upper and lower ends of the end plate can be communicated, and each branch float is provided with a second flow-through hole which passes through the upper and lower end faces thereof.

[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 is provided with a third flow-through hole which passes through the upper and lower end faces thereof; and / or, the top end of the limiting guide rod is connected to the upper floating limiting member, and the bottom end of the limiting 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 upper floating limiting member, and when the end plate is attached to the bottom side of the upper floating limiting member, each first flow-through hole at the corresponding position of the annular gap is in a communication state, and the remaining first flow-through holes are truncated by the end plate.

[0011] In some embodiments, when each branch float is in the blocking position, the total flow area of the second flow-through hole on each branch float is Sa, the flow area of the outlet is Sb, and 70%≤(Sb-Sa) / Sb≤90%; and / or, the upper floating limiting member and / or the end plate is a circular truncated cone shell.

[0012] In some embodiments, the diameters of the second through holes on the branch float are gradually increased from inside to outside along the diameter direction of the branch float; and / or, the diameters of the first through holes and / or the third through holes are gradually increased from inside to outside along the diameter direction of the limiting guide rod.

[0013] In some embodiments, the circumferential displacement of the vertical float is limitedly sleeved to the radially 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 limitedly sleeved to the radially outer side of the vertical float.

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

[0015] The application also provides an air conditioning system comprising an evaporator and a compressor, wherein the evaporator is the aforementioned evaporator, and the top end gas outlet of the gas collecting pipe of the evaporator is communicated with the suction port of the compressor through a suction pipe.

[0016] The evaporator and the air conditioning system having the same provided by the application have the following beneficial effects:

[0017] By arranging the branch float corresponding to the outlet of the heat exchange coil in the gas collecting pipe, when the refrigerant distribution in the heat exchange coil is uneven, the liquid state refrigerant will flow out in the liquid state at the outlet of the heat exchange coil and form liquid accumulation at the bottom of the gas collecting pipe. The liquid accumulation forms a buoyancy force for the branch float in contact therewith, and with the increase of the height of the liquid accumulation, the branch float eventually forms a blockage corresponding to the outlet, thereby causing more liquid state refrigerant in the distributor to flow to the upper region of the heat exchange core, which is beneficial to the uniform distribution of the liquid state refrigerant in the height direction of the heat exchange core. On the one hand, the liquid accumulation in the gas collecting pipe can be slowed down, and the flow resistance of the gaseous refrigerant is reduced, which is beneficial to the smooth operation of other parts of the subsequent system. On the other hand, more liquid state refrigerant is guided into the upper heat exchange coil, which improves the overheating phenomenon of the upper coil. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other embodiments can be derived from the provided drawings without paying creative labor.

[0019] Figure 1 is a structural schematic diagram of the evaporator of the embodiment of the application;

[0020] Figure 2 is Figure 1 is a partial enlarged view of A in FIG. 1;

[0021] Figure 3 is Figure 1 is a partial enlarged view of B in FIG. 1;

[0022] Figure 4 is Figure 1 is a cross-sectional view of both the vertical float and the limiting guide rod in an assembled state;

[0023] Figure 5 is Figure 1 is a bottom view of both the vertical float and the limiting guide rod in an assembled state;

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

[0025] The reference signs are:

[0026] 11, heat exchange coil; 12, distributor; 13, gas collector; 21, limiting guide rod; 22, branch float; 221, second through hole; 222, connecting column; 23, vertical float; 231, stop rod; 232, end plate; 2321, third through hole; 3, upper float limiting member; 31, first through hole; 100, evaporator; 101, compressor; 102, suction pipe; 103, condenser; 1031, gas distribution pipe; 1032, liquid collector; 104, throttling element. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. The description of the at least one exemplary embodiment is actually only illustrative in nature and by no means constitutes any limitation to the application and its application or use. All other embodiments obtained by a person of ordinary skill in the art without any creative effort on the basis of the embodiments in the application fall within the scope of protection of the application.

[0028] In the description of the application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation to the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0029] For purposes of the description hereinafter, spatially relative terms, such as "above", "below", "up", "down", "top", "bottom", "lateral", "longitudinal" and the like, can be used to describe an element's relationship to another element as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. For example, if a device in the figures is inverted, elements described as "above" other elements or "below" other elements can be oriented "below" the other elements or "above" the other elements, respectively. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0030] In addition, it should be noted that the use of "first", "second", and the like, to describe a component does not limit the scope of the present application to the corresponding component of the description and / or claims. The terms are only used to distinguish one element from another.

[0031] Referring to Figure 1 and Figure 6 According to the embodiment of the present application, an evaporator is provided, which comprises a plurality of heat exchange coils 11, a distributor 12 connected to the inlet of each heat exchange coil 11, and a gas collector 13 connected to the outlet of each heat exchange coil 11. It can be understood that the heat exchange coils 11 are arranged in parallel and spaced apart from each other to form a heat exchange core, and the distributor 12 and the gas collector 13 are respectively arranged on the left and right sides of the heat exchange core. The gas collector 13 is provided with a limiting guide rod 21 extending along the height direction of the gas collector 13 and a plurality of branch float plugs 22 slidingly connected with the limiting guide rod 21. Each branch float plug 22 has a blocking position in contact with the outlet to form a blockage and a flow-through position away from the outlet. Each branch float plug 22 can be lifted along the guiding direction of the limiting guide rod 21 under the action of the buoyancy of the liquid accumulated at the bottom of the gas collector 13 to switch from the flow-through position to the blocking position to at least achieve the upward blocking of the outlet of the heat exchange coil 11 at the lower part. It should be noted that the aforementioned upward blocking means that, starting from the heat exchange coil 11 at the bottom of the heat exchange core, with the increase of the height of the accumulated liquid, each branch float plug 22 is floated upward one by one under the action of the buoyancy and finally switched from the flow-through position to the blocking position to achieve the blocking of the outlet corresponding to the position.

[0032] The technical scheme, by setting the branch float 22 corresponding to the outlet of the heat exchange coil 11 in the gas collecting pipe 13, when the refrigerant distribution in the heat exchange coil 11 is uneven, the liquid state flows out at the outlet of the heat exchange coil 11 and forms a liquid pool at the bottom of the gas collecting pipe 13, the liquid pool forms a buoyancy that rises on the branch float 22 in contact with it, and with the increase of the liquid pool height, the branch float 22 eventually forms a blockage of the corresponding outlet, thereby making more liquid refrigerant in the distributor 12 flow to the upper region of the heat exchange core, which is beneficial to the uniform distribution of liquid refrigerant in the height direction of the heat exchange core, on the one hand, it can slow down the liquid pool in the gas collecting pipe 13, reduce the flow resistance of the gaseous refrigerant, and facilitate the smooth operation of other parts of the subsequent system, on the other hand, more liquid refrigerant is guided into the upper heat exchange coil 11, which improves the overheating phenomenon of the upper coil.

[0033] In some embodiments, the branch float 22 is a circular truncated cone, the small area end face of the circular truncated cone is arranged opposite to the outlet 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 greater than the diameter of the outlet.

[0034] Specifically referring to Figure 2 As shown, the aforementioned branch float 22 can be a circular truncated cone shell, when it is in the blocking position, it has an outer conical surface that can contact the edge of the outlet of the heat exchange coil 11 and thereby form a blockage of the outlet, the outer conical surface can guide the position switching of the branch float 22, ensuring smooth and accurate position switching.

[0035] It should be noted that the aforementioned branch float 22 can be slidably sleeved on the outer wall of the limiting guide rod 21 through the corresponding connecting column 222 in specific application, at this time each branch float 22 needs to be in contact with the liquid pool, and then use the liquid pool buoyancy to realize the lifting of itself, that is, the branch float 22 should choose a material that can make it float on the liquid pool in terms of manufacturing material, such as rubber, foam, etc.

[0036] In another preferred embodiment, a vertical float 23 is further provided within the manifold 13. The vertical float 23 is capable of rising and falling in accordance with the height of the accumulated liquid. The vertical float 23 is slidably connected to the limiting guide rod 21. A plurality of branch floats 22 are slidably connected to the vertical float 23 at intervals along the length of the limiting guide rod 21. Furthermore, a retaining rod 231 is fixedly provided on the vertical float 23, corresponding to each branch float 22. Each retaining rod 231 is positioned below a corresponding branch float 22. Each retaining rod 231 may be integrally formed with the vertical float 23 or a separate component assembled with the vertical float 23. The retaining rod 231 retains the vertically spaced branch floats 22 at positions below the outlets of their corresponding heat exchange coils 11, thereby ensuring a one-to-one correspondence between each branch float 22 and the heat exchange coil 11. The aforementioned sliding connection may be, for example, a gap-fitting connection between the two.

[0037] In this technical solution, each branch float 22 is slidably connected to the vertical float 23, and each baffle 231 is arranged on the vertical float 23 at intervals in the upper and lower directions along its height direction below each branch float 22, 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 one-to-one to the outlet of each heat exchange coil 11 and is limited to a position below its corresponding outlet, which ensures the one-to-one correspondence between each branch float 22 and each outlet, simplifies the structural design, and ensures 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 22 is made larger from bottom to top, that is, smaller from top to bottom, which can ensure that each branch float 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, the gas collector 13 is further provided with an upper floating limiting member 3, which separates the gas collector 13 into an upper cavity and a lower cavity, the upper floating limiting member 3 has a plurality of first flow-through holes 31 penetrating the upper cavity and the lower cavity, the vertical float 23 has an end plate 232 on the top end, when the vertical float 23 rises to the highest position under the floating force of the liquid, the end plate 232 can be attached to the bottom side of the upper floating limiting member 3 and at least partially block the first flow-through holes 31, the gaseous fluid on the upper and lower ends of the end plate 232 can communicate, each branch float plug 22 has a second flow-through hole 221 penetrating the upper and lower end faces thereof.

[0041] In the technical solution, the gas collector 13 is separated into an upper cavity and a lower cavity by the aforementioned upper floating limiting member 3, wherein the top surface of the upper cavity is the top gas outlet of the gas collector 13, when the end plate 232 on the top end of the vertical float 23 is attached to the bottom side of the upper floating limiting member 3, the communication flow area of the upper cavity and the lower cavity is reduced, at this time, the airflow pressure in the lower cavity will increase, at this time, it can be understood that each branch float plug 22 on the vertical float 23 is respectively in the blocking position of the outlet of each heat exchange coil 11, i.e., each branch float plug 22 is in the blocking position, and since the second flow-through hole 221 penetrating the upper and lower sides of each branch float plug 22 is further provided in the technical solution, as the pressure in the lower cavity increases, the liquid will enter each heat exchange coil 11 in contact with the liquid in a reverse direction through each second flow-through hole 221, which objectively increases the heat exchange tube length of the liquid refrigerant, and the liquid refrigerant can be fully heat-exchanged and vaporized, thereby reducing the amount of liquid in the bottom of the gas collector 13, i.e., the liquid level of the liquid in the gas collector 13 will be reduced, and the vertical float 23 will also be lowered, the communication flow area of the upper cavity and the lower cavity is increased, the gaseous refrigerant enters the upper cavity from the lower cavity and is smoothly discharged from the gas collector 13, i.e., in the technical solution, as the liquid level rises, the actual flow area of the upper floating limiting member 3 decreases, and the pressure in the lower cavity of the gas collector 13 increases, under the action of the pressure, the liquid is again flowed toward the side of the distributor 12 through each heat exchange coil 11 below the liquid level, so that the liquid returns to the heat exchange core of the evaporator again, which improves the tube length of the refrigerant and makes the heat exchange more sufficient, the liquid is heat-absorbed and vaporized, and the liquid does not need to be discharged from the gas collector 13 to prevent the liquid from continuously increasing. It can be understood that the liquid returning to the heat exchange core of the evaporator in the present application also improves the circulation amount of the refrigerant.

[0042] In some embodiments, the maximum diameter of the end plate 232 is smaller than the maximum diameter of the gas collecting pipe 13 to form an annular gap (not labeled in the figure) therebetween, and the end plate 232 has a third through-flow hole 2321 passing through both end faces thereof, so as to ensure that the gas flow area in the lower cavity of the gas collecting pipe 13 is relatively large when the end plate 232 and the upper floating limiting member 3 are not in close contact, and to ensure the heat exchange effect of the evaporator.

[0043] In a specific embodiment, the top end of the limiting guide rod 21 is connected to the upper floating limiting member 3, and the bottom end of the limiting guide rod 21 is connected to the bottom wall of the gas collecting pipe 13, that is, the aforementioned upper floating limiting member 3 not only separates the upper cavity and the lower cavity of the gas collecting pipe 13, but also positions the top end of the limiting guide rod 21, thereby ensuring the bending resistance of the limiting guide rod 21 and the smoothness of the lifting 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 upper floating limiting member 3, and when the end plate 232 is in close contact with the bottom side of the upper floating limiting member 3, each of the first through-flow holes 31 at the corresponding position of the annular gap is in communication, and the remaining first through-flow holes 31 are blocked 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 liquid level reaches the highest point, the end plate 232 will block each of the first through-flow holes 31 in the close contact area, and the upper cavity and the lower cavity are only connected through each of the first through-flow holes 31 in the aforementioned annular gap, which can ensure the rapid increase of the pressure in the lower cavity and thereby more efficiently drive the liquid back to the heat exchange core of the evaporator for heat exchange and vaporization.

[0045] In a specific embodiment, the projections of the first through-flow holes 31 and the third through-flow holes 2321 on the horizontal plane under the condition that the end plate 232 and the upper floating limiting member 3 are in close contact are arranged in a staggered manner, that is, there is no overlapping part, so as to achieve the purpose of passing through the gas when the end plate 232 is not at the highest position and the purpose of blocking the first through-flow holes 31 when the end plate 232 is at the highest position.

[0046] Continuing to refer to Figure 3 In a specific embodiment, the upper floating limiting member 3 and / or the end plate 232 are circular truncated cone housings, and each of the first through-flow holes 31 and the third through-flow holes 2321 is formed on the outer conical surface of the circular truncated cone housing. Designing the aforementioned upper floating limiting member 3 and the end plate 232 as circular truncated cone housings with matching shapes can ensure that the solid part of the end plate 232 accurately corresponds to each of the first through-flow holes 31 on the upper floating limiting member 3 when they are in close contact, thereby ensuring the blocking effect.

[0047] In some embodiments, when each of the branch floaters 22 is in the blocking position, the total flow area of the second flow holes 221 on each of the branch floaters 22 is Sa, the flow area of the outlet is Sb, and 70%≤(Sb-Sa) / Sb≤90%; further, along the diameter direction of the branch floater 22 from inside to outside, the aperture of each of the second flow holes 221 on each of the branch floaters 22 is increasingly larger, that is, the aperture of each of the second flow holes 221 near the central region on each branch floater 22 is smaller, and the aperture of each of the second flow holes 221 near the outer edge is larger, so that when the branch floater 22 is not in contact with the outlet, a better liquid blocking effect can be achieved, and when each of the branch floaters 22 is in contact with the outlet, that is, the vertical floater 23 is in the highest position, a larger flow can be achieved. 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 flow holes 31 and / or the third flow holes 2321 is increasingly larger.

[0048] In some embodiments, the circumferential displacement of the vertical floater 23 is limitedly sleeved on the radially outer side of the limiting guide rod 21; and / or, the branch floater 22 has a connecting column 222, the circumferential displacement of which is limitedly sleeved on the radially outer side of the vertical floater 23, so as to ensure that each of the branch floaters 22 can accurately correspond to the outlet of each of the heat exchange coils 11. Specifically, the cross section of the vertical floater 23 and the limiting guide rod 21 is a polygon that matches in shape, as shown in Figure 4 Similarly, the connecting ring of the connecting column 222 and the cross section of the vertical floater 23 are polygons that match in shape.

[0049] In this technical solution, the cross sections of the two components that are sleeved on each other are designed as polygons, and the edges of the polygons are used to prevent rotation in the circumferential direction, which is simple in structure.

[0050] With the height of the liquid level in the gas collector 13, the working states of the aforementioned vertical floater 23 and branch floater 22 can be divided into four cases:

[0051] 1. When there is no liquid in the gas collector 13, the vertical floater 23 is tightly attached to the bottom of the gas collector 13 under the action of gravity, the venting circular table surface at the top of the vertical floater 23 (that is, the aforementioned upper floating limiting member 3, the same below) has the largest gas flow area with the circular table surface (that is, the aforementioned end plate 232, the same below) at the top of the limiting guide rod 21 (that is, the aforementioned limiting guide rod 21, the same below), and the bottom of each branch floater 22 nested on the vertical floater 23 is tightly attached to the lower baffle (that is, the aforementioned baffle 231, the same below).

[0052] 2、When the liquid level in the header pipe 13 is lower than the outlet height of the lowest coil of the evaporator, the vertical float 23 floats and drives the first branch float 22 to move upwards from bottom to top, that is, the bottom branch float 22, because the lower baffle of the bottom branch float 22 is arranged at the shortest distance from the outlet of the lowest coil of the evaporator, the outlet area of the lowest coil of the evaporator is reduced, the liquid outlet resistance is increased, and at the same time, with the floating of the vertical float 23, the gas flow area between the top venting circular platform of the vertical float 23 and the top fixed venting circular platform surface of the fixed shaft is reduced, the gas resistance is increased, and the two work together to promote the upward distribution of the refrigerant flow at the inlet of the evaporator, so that the refrigerant in the evaporator is fully heat exchanged, and finally the liquid level in the header pipe is reduced, the vertical float is lowered, and the gas flow area of the top fixed venting circular platform surface is increased, so that the gas is smoothly discharged from the header pipe.

[0053] 3、When the liquid level in the header pipe is higher than the outlet height of the first coil from bottom to top and lower than the outlet height of the second coil, the vertical float continues to float upwards, drives the first branch float to move upwards to the set maximum liquid blocking area, drives the second branch float to move upwards to the second coil outlet cross section of the evaporator, and at the same time, the gas flow area between the top venting circular platform of the vertical float and the top fixed venting circular platform surface of the fixed shaft continues to be reduced, the gas resistance is increased more, and the liquid in the header pipe is forced to pass through the first coil outlet of the evaporator submerged by the liquid level to return to the evaporator again to continue to participate in heat exchange, and the two work together to promote the upward distribution of the refrigerant flow at the inlet of the evaporator, so that the refrigerant is fully heat exchanged, and finally the liquid level in the header pipe is reduced, the vertical float is lowered, the gas flow area of the top fixed venting circular platform surface is increased, and the gas is smoothly discharged from the header pipe. By analogy, this situation can be applied to the case where the liquid level continues to rise to other heights until the liquid level drives the vertical float to the maximum height, that is, the fourth case below.

[0054] 4、When the evaporator outlet branch is seriously liquid-carrying, the liquid level in the header pipe continues to rise, drives the vertical float to float to the maximum height, that is, the upper surface of the top venting circular platform surface of the vertical float coincides with the lower surface of the top fixed circular platform surface of the fixed shaft, at this time, the gas flow area of the top of the header pipe reaches the minimum, the vertical float and the branch float submerged by the liquid level are no longer moved, but because the branch float structure is also a movable nested structure arranged on the vertical float, the branch float not submerged can continue to move upwards with the rising of the liquid level, complete the blocking of the liquid-carrying coil outlet, optimize the flow distribution of the evaporator, and finally the liquid level in the header pipe is reduced, the vertical float is lowered, the gas flow area of the top fixed venting circular platform surface is increased, and the gas is smoothly discharged from the header pipe.

[0055] According to the embodiment of the present application, an air conditioning system is also provided, which is specifically described in Figure 6As shown, it comprises 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 end gas outlet of the gas collecting pipe 13 of the evaporator 100 is communicated with the suction port of the compressor 101 through a suction pipe 102, that is, due to the liquid in the gas collecting pipe of the evaporator in the application can be refluxed to the evaporator heat exchange core to heat and gasify again, the dryness of the refrigerant at the gas outlet of the gas collecting pipe 13 can be ensured, therefore, the gas-liquid separator is no longer arranged between the evaporator 100 and the compressor 101.

[0056] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An evaporator comprising a plurality of heat exchange coils (11), a distributor (12) communicating with the inlet of each of said heat exchange coils (11), and a header (13) communicating with the outlet of each of said 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 float plugs (22) in sliding connection with the limiting guide rod (21), each branch float plug (22) has a blocking position in contact with the outlet and forming a blockage and a flow-through position away from the outlet, each branch float plug (22) can be lifted along the guiding direction of the limiting guide rod (21) under the buoyancy of the liquid in the bottom of the gas collecting pipe (13) to switch from the flow-through position to the blocking position to at least achieve the bottom-up blocking of the lower pipe opening in each heat exchange coil (11); the gas collecting pipe (13) is also provided with a vertical float (23) in sliding connection with the limiting guide rod (21), a plurality of branch float plugs (22) are in sliding connection with the vertical float (23) along the length direction of the limiting guide rod (21), and the vertical float (23) is also fixedly provided with a stop rod (231) corresponding to each branch float plug (22), each stop rod (231) is below the corresponding branch float plug (22); when there is no liquid in the gas collecting pipe (13), the position of the vertical float (23) is the initial position, and when the vertical float (23) is in the initial position, the height distance between each corresponding stop rod (231) and the branch float plug (22) becomes larger and larger from the bottom to the top of the limiting guide rod (21).

2. The evaporator of claim 1, wherein, The branch float plug (22) is a circular truncated cone, the small area end face of the circular truncated cone is 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.

3. The evaporator of claim 1, wherein, When the vertical float (23) is in the initial position, each branch float plug (22) is below the corresponding outlet.

4. The evaporator of claim 3, wherein, The gas collecting pipe (13) is also provided with an upper floating limiting member (3) separating the gas collecting pipe (13) into an upper chamber and a lower chamber, the upper floating limiting member (3) has a plurality of first flow-through holes (31) penetrating the upper chamber and the lower chamber, the top end of the vertical float (23) has an end plate (232), when the vertical float (23) is lifted to the highest position under the buoyancy of the liquid, the end plate (232) can be in contact with the bottom side of the upper floating limiting member (3) and at least partially block the first flow-through holes (31), the gaseous fluid at the upper and lower ends of the end plate (232) can communicate, and each branch float plug (22) has a second flow-through hole (221) penetrating the upper and lower end faces thereof.

5. The evaporator of claim 4, wherein, The maximum diameter of the end plate (232) is smaller than the gas collecting pipe (13) to form an annular gap therebetween, and the end plate (232) has a third through-flow hole (2321) penetrating through both end faces thereof; and / or, the top end of the limiting guide rod (21) is connected with the upper floating limiting member (3), and the bottom end of the limiting guide rod (21) is connected with the bottom wall of the gas collecting pipe (13).

6. The evaporator of claim 5, wherein, The maximum diameter of the end plate (232) is smaller than the maximum diameter of the upper floating limiting member (3), and when the end plate (232) is attached to the bottom side of the upper floating limiting member (3), each first through-flow hole (31) at a position corresponding to the annular gap is in a communication state, and the remaining first through-flow holes (31) are truncated by the end plate (232).

7. The evaporator of claim 4, wherein, When each branch float plug (22) is in the plugging position, the total area of the second through-flow hole (221) on each branch float plug (22) is Sa, the flow area of the outlet is Sb, and 70%≤(Sb-Sa) / Sb≤90%; and / or, the upper floating limiting member (3) and / or the end plate (232) is a circular truncated cone housing.

8. The evaporator of claim 5, wherein, From inside to outside along the diameter direction of the branch float plug (22), the aperture of each second through-flow hole (221) on each branch float plug (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 first through-flow hole (31) and / or the third through-flow hole (2321) becomes larger and larger.

9. The evaporator of claim 1, wherein, The circumferential displacement of the vertical float (23) is limitedly sleeved on the radially outer side of the limiting guide rod (21); and / or, the branch float plug (22) has a connecting column (222), and the circumferential displacement of the connecting column (222) is limitedly sleeved on the radially outer side of the vertical float (23).

10. The evaporator of claim 9, wherein, The cross section of the vertical float (23) and the limiting guide rod (21) is a polygon with a matching shape; and / or, the connecting ring of the connecting column (222) and the cross section of the vertical float (23) are polygons with a matching shape.

11. An air conditioning system, characterized by, The system comprises an evaporator (100) and a compressor (101), the evaporator (100) is the evaporator according to any one of claims 1 to 10, and the top end gas outlet of the gas collecting pipe (13) of the evaporator (100) is in communication with the suction port of the compressor (101) through a suction pipe (102).

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