Tank heat exchanger and air conditioning system

Abstract

This disclosure provides a tank heat exchanger and an air conditioning system. The tank heat exchanger includes: an outer cylinder; an inner cylinder, the outer cylinder being arranged parallel to the axis of the inner cylinder and forming an annular space between them; a first heat exchange tube; a liquid distribution plate located on the side of the first heat exchange tube near the axial first end of the tank heat exchanger, the radial outer end of the liquid distribution plate forming a gas passage with the cylinder wall of the outer cylinder, and / or, the radial inner end of the liquid distribution plate forming a gas passage with the cylinder wall of the inner cylinder; and a shielding portion axially spaced from the liquid distribution plate, the shielding portion including a shielding body located on the side of the liquid distribution plate facing the axial first end of the tank heat exchanger, and along the radial direction of the tank heat exchanger, the shielding body completely covers the corresponding gas passage, one of the radial inner end and the radial outer end of the shielding body is a connecting end, and the other is a free end, the connecting end being sealed to one of the cylinder walls of the inner cylinder and the outer cylinder, and the free end being spaced from the other cylinder wall of the inner cylinder and the outer cylinder.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of air conditioning, and in particular relates to a tank heat exchanger and an air conditioning system. BACKGROUND

[0002] As a new type of high-efficiency energy-saving equipment, the falling film evaporator is widely used in water-cooled units due to its small refrigerant charge, small static pressure difference, high heat exchange efficiency, and convenient oil return. However, due to the structural limitations, the performance of the falling film evaporator is not ideal in units less than 100 RT. Therefore, generally, only dry evaporators or double-pipe heat exchangers with lower energy efficiency can be used in these units.

[0003] In the related art, some falling film evaporators are provided with a liquid equalizing device to receive liquid refrigerant flowing from above, and to divide the liquid refrigerant and then flow to the coil pipe in the falling film area below. However, the refrigerant entering the evaporator can not be in a pure liquid state, and a certain amount of gaseous refrigerant is often carried in the liquid refrigerant. After the liquid refrigerant is evaporated and exchanged by the heat exchange coil above the liquid equalizing disc, a part of gaseous refrigerant is generated. The density of the gaseous refrigerant is much lower than that of the liquid refrigerant, which greatly increases the average flow rate through the holes or gaps of the liquid equalizing disc, not only increases the pressure drop of the fluorine side in the heat exchanger, but also easily causes the liquid refrigerant to splash and flow, which is not conducive to the liquid distribution and falling film evaporation of the liquid refrigerant on the heat exchange coil below the liquid equalizing device. SUMMARY

[0004] The purpose of the present disclosure is to provide a tank heat exchanger and an air conditioning system.

[0005] A first aspect of the present disclosure provides a tank heat exchanger provided with a working medium inlet and a working medium outlet, the tank heat exchanger comprising:

[0006] an outer cylinder;

[0007] an inner cylinder in communication with the outer cylinder, the outer cylinder and the inner cylinder being arranged in parallel with the axis of the tank heat exchanger, and an annular space being formed between the outer cylinder and the inner cylinder;

[0008] a first heat exchange pipe coiled in the outer cylinder;

[0009] a liquid equalizing disc fixedly arranged in the annular space relative to the outer cylinder and the inner cylinder and located on one side of the first heat exchange pipe close to an axial first end of the tank heat exchanger, a radial outer end of the liquid equalizing disc forming a gas passage with the cylinder wall of the outer cylinder, and / or a radial inner end of the liquid equalizing disc forming a gas passage with the cylinder wall of the inner cylinder; and

[0010] The shielding part is fixedly arranged in the annular space relative to the outer cylinder and the inner cylinder and axially spaced from the liquid distribution tray, and includes a shielding body corresponding to the gas passage, the shielding body is located on one side of the liquid distribution tray towards an axially first end of the tank heat exchanger, and extends along a radial direction of the tank heat exchanger, the shielding body completely covers the corresponding gas passage, one of the radial inner end and the radial outer end of the shielding body is sealingly connected with one of the cylinder wall of the inner cylinder and the cylinder wall of the outer cylinder, and the other is spaced from the other of the cylinder wall of the inner cylinder and the cylinder wall of the outer cylinder.

[0011] According to some embodiments of the present disclosure, one of the radial inner end and the radial outer end of the liquid distribution tray is sealingly connected with one of the cylinder wall of the outer cylinder and the cylinder wall of the inner cylinder, and the other of the radial inner end and the radial outer end of the liquid distribution tray forms the gas passage with the other of the cylinder wall of the outer cylinder and the cylinder wall of the inner cylinder.

[0012] According to some embodiments of the present disclosure,

[0013] The radial outer end of the liquid distribution tray is sealingly connected with the inner wall of the outer cylinder, and the radial inner end of the liquid distribution tray forms the gas passage with the outer wall of the inner cylinder.

[0014] The radial inner end of the shielding body is fixedly connected with the outer wall of the inner cylinder.

[0015] According to some embodiments of the present disclosure, the gas passage is annular in a cross section perpendicular to the axial direction of the tank heat exchanger.

[0016] According to some embodiments of the present disclosure, the shielding body is a baffle plate perpendicular to the axial direction of the tank heat exchanger.

[0017] According to some embodiments of the present disclosure, the shielding part further comprises an edge plate connected to the free end of the shielding body and extending towards an axially second end of the tank heat exchanger.

[0018] According to some embodiments of the present disclosure, the shielding body is a baffle plate extending from the connecting end to the free end towards the liquid distribution tray.

[0019] According to some embodiments of the present disclosure, the baffle plate is a flat plate or an arc-shaped plate.

[0020] According to some embodiments of the present disclosure, further comprising a plurality of flow guiding parts arranged at intervals on an edge of the shielding part close to the liquid distribution tray and extending towards the liquid distribution tray.

[0021] According to some embodiments of the present disclosure,

[0022] The liquid equalizing disc is in a groove structure recessed from an axial first end to an axial second end of the falling film evaporator.

[0023] The flow guide part partially extends into the groove structure, or an edge of the flow guide part close to the axial second end of the falling film evaporator is axially aligned with an edge of the groove structure close to the axial first end of the falling film evaporator.

[0024] According to some embodiments of the present disclosure, the inner cylinder is a cylindrical or polygonal cylinder.

[0025] According to some embodiments of the present disclosure, a U-shaped tube is further included, a tube center line of the U-shaped tube is arranged in a plane along a radial direction of the tank heat exchanger, a first end of the U-shaped tube is arranged in the inner cylinder and is in communication with the inner cylinder, and a second end of the U-shaped tube is used to be connected with a gaseous working medium pipeline to introduce or discharge gaseous working medium.

[0026] According to some embodiments of the present disclosure,

[0027] The working medium inlet includes a liquid inlet arranged at an axial first end of the outer cylinder and used to introduce liquid working medium, and the working medium outlet includes a gaseous working medium outlet in communication with the inner cylinder and used to discharge gaseous working medium; and / or

[0028] The working medium inlet includes a gaseous working medium outlet in communication with the inner cylinder and used to introduce gaseous working medium, and the working medium outlet includes a liquid outlet arranged at an axial second end of the outer cylinder and used to discharge liquid working medium.

[0029] According to some embodiments of the present disclosure, further comprising:

[0030] A second heat exchange tube is coiled in the outer cylinder and located on a side of the shielding part away from the liquid equalizing disc; and / or

[0031] A third heat exchange tube is coiled in the outer cylinder and located on a side of the first heat exchange tube away from the liquid equalizing disc.

[0032] According to some embodiments of the present disclosure, the outer cylinder includes a cylinder body, a first end cover and a second end cover, the cylinder body is arranged in a split manner along a radial direction of the tank heat exchanger, the first end cover is closed at an axial first end of the cylinder body, the second end cover is closed at an axial second end of the cylinder body, and an axial first end of the inner cylinder is connected to the first end cover.

[0033] A second aspect of the present disclosure is an air conditioning system, including the tank heat exchanger of the first aspect of the present disclosure.

[0034] The tank heat exchanger provided by the embodiments of the present disclosure has the liquid and gas two-phase working medium flowing inside, the gas working medium can flow up and down through the axial spacing between the blocking part and the liquid distribution disc and the gas passage, the liquid working medium can flow down through the liquid distribution disc, and the gas working medium has an independent flow space, so that the average flow speed of the liquid working medium can be reduced, thereby reducing the pressure drop of the working medium in the heat exchanger. In addition, the blocking part can recover the liquid working medium flowing down the cylinder wall and guide the liquid working medium flowing down the cylinder wall into the liquid distribution disc, so that the waste of falling film liquid can be reduced, and the heat exchange efficiency can be improved.

[0035] The air conditioning system provided by the embodiments of the present disclosure has the advantages of the tank heat exchanger provided by the embodiments of the present disclosure.

[0036] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] The drawings described herein are intended to provide further understanding of the present disclosure, and constitute a part of the present application. The schematic embodiments of the present disclosure and the description thereof are used to explain the present disclosure, and do not constitute an improper limitation on the present disclosure. In the drawings:

[0038] Figure 1 A structural schematic diagram of the tank heat exchanger of some embodiments of the present disclosure.

[0039] Figure 2 A structural schematic diagram of the tank heat exchanger of some embodiments of the present disclosure. Figure 1 A sectional structural schematic diagram of the tank heat exchanger.

[0040] Figure 3 A structural schematic diagram of the tank heat exchanger in position. Figure 2 A local enlarged structural schematic diagram of the tank heat exchanger.

[0041] Figure 4 A structural schematic diagram of the blocking part of the tank heat exchanger of some embodiments of the present disclosure.

[0042] Figure 5 A structural schematic diagram of the blocking part of the tank heat exchanger of some embodiments of the present disclosure.

[0043] Figure 6 A structural schematic diagram of the flow guide part of the tank heat exchanger of some embodiments of the present disclosure.

[0044] Figure 7 A structural schematic diagram of the tank heat exchanger of some embodiments of the present disclosure.

[0045] Figures 1 to 6 In the drawings, the reference signs respectively represent:

[0046] 1, outer cylinder; 10, liquid inlet; 11, cylinder body; 12, first end cover; 13, liquid outlet; 14, second end cover; 2, inner cylinder; 3, falling film zone heat exchange tube; 31, first heat exchange tube; 32, second heat exchange tube; 4, liquid distribution disc; 40, liquid distribution hole; 5, shielding part; 51, baffle; 52, edge plate; 6, flow guide part; 7, U-shaped tube; 70, gaseous working medium port; 8, liquid distributor; 9, third heat exchange tube. G, gas passage. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present disclosure will be described clearly and completely in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present disclosure.

[0048] Unless otherwise specifically stated, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the various examples herein are only meant to be illustrative, and not restrictive. It should be understood that the size of the various parts shown in the drawings can not be to scale, and that the drawings are not necessarily to scale. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the present disclosure. In all examples shown and discussed herein, any specific value should be interpreted as merely illustrative, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numerals and letters in the following drawings represent similar items, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0049] In the description of the present disclosure, it should be understood that the use of the words "first", "second", and the like, to define parts, is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0050] In the description of the present disclosure, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present disclosure and simplifying the description, without the opposite description, these orientation words 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 on the protection scope of the present disclosure; the orientation words "inner, outer" refer to the inner and outer relative to the outline of each component itself.

[0051] As Figures 1 to 7 shown, some embodiments of the present disclosure provide a shell-and-tube heat exchanger, which is provided with a working medium inlet and a working medium outlet, and comprises an outer cylinder 1, an inner cylinder 2, a first heat exchange tube 31, a liquid equalizing disc 4 and a shielding part 5.

[0052] The inner cylinder 2 is communicated with the outer cylinder 1, and the outer cylinder 1 is arranged in parallel with the axis of the inner cylinder 2, and an annular space is formed between the inner cylinder 2.

[0053] The first heat exchange tube 31 is coiled in the outer cylinder 1.

[0054] The liquid equalizing disc 4 is fixedly arranged in the annular space relative to the outer cylinder 1 and the inner cylinder 2 and located on the side of the first heat exchange tube 31 close to the axial first end of the shell-and-tube heat exchanger, the radial outer end of the liquid equalizing disc 4 forms a gas passage G with the cylinder wall of the outer cylinder 1, and / or the radial inner end of the liquid equalizing disc 4 forms a gas passage G with the cylinder wall of the inner cylinder 2.

[0055] The shielding part 5 is fixedly arranged in the annular space relative to the outer cylinder 1 and the inner cylinder 2 and axially spaced from the liquid equalizing disc 4, the shielding part 5 comprises a shielding body corresponding to the gas passage G, the shielding body is located on the side of the liquid equalizing disc 4 facing the axial first end of the shell-and-tube heat exchanger, and along the radial direction of the shell-and-tube heat exchanger, the shielding body completely covers the corresponding gas passage G, one of the radial inner end and the radial outer end of the shielding body is a connecting end, and the other is a free end, the connecting end is sealingly connected with one of the cylinder wall of the inner cylinder 2 and the cylinder wall of the outer cylinder 1, and the free end is spaced from the other of the cylinder wall of the inner cylinder 2 and the cylinder wall of the outer cylinder 1.

[0056] In the following description of the present disclosure, it can be understood that in the use state of the shell-and-tube heat exchanger, the axial direction of the outer cylinder 1 is the up-down direction, the axial first end of the outer cylinder 1 is the top end, and the axial second end is the bottom end.

[0057] The shell-and-tube heat exchanger of the present disclosure can be a falling-film heat exchanger, a flooded heat exchanger or other forms of heat exchanger, and can be used as an evaporator or a condenser. The shell-and-tube heat exchanger can be used in an air conditioning system, but is not limited to an air conditioning system. When the shell-and-tube heat exchanger is used in an air conditioning system, the working medium can be refrigerant.

[0058] The outer cylinder 1 and the inner cylinder 2 can have the same or different axial dimensions along the axial direction of the shell-and-tube heat exchanger, for example, Figure 1 and Figure 2 In the embodiment shown, the outer cylinder 1 is closed at both axial ends, and the inner cylinder 2 can have a smaller axial dimension along the axial direction of the shell-and-tube heat exchanger than the outer cylinder 1, the first axial end of the inner cylinder 2 is connected to the first axial end of the outer cylinder 1, and the second axial end of the inner cylinder 2 is in communication with the outer cylinder 1. In some embodiments not shown, the outer cylinder 1 and the inner cylinder 2 can have the same axial dimension along the axial direction of the shell-and-tube heat exchanger, and both axial ends of the inner cylinder 2 are connected to the outer cylinder 1, and the inner cylinder 2 and the outer cylinder 1 can be in communication through an opening or a pipe on the inner cylinder 2.

[0059] The working fluid inlet and the working fluid outlet can be arranged at different positions of the shell-and-tube heat exchanger according to the selection requirements of the heat exchanger, such as the first axial end and the second axial end of the outer cylinder 1 or the inner cylinder 2. In some embodiments, when the shell-and-tube heat exchanger is used as an evaporator, the working fluid inlet can be in communication with the first axial end of the outer cylinder 1 and used to introduce liquid working fluid, and the working fluid outlet can be in communication with the inner cylinder 2 and used to export gaseous working fluid; in other embodiments, when the shell-and-tube heat exchanger is used as a condenser, the working fluid inlet can be in communication with the inner cylinder 2 and used to introduce gaseous working fluid, and the working fluid outlet can be in communication with the second axial end of the outer cylinder 1 and used to export liquid working fluid.

[0060] In addition, the same working fluid port can be used as the working fluid inlet when the shell-and-tube heat exchanger is used as an evaporator, and as the working fluid outlet when the shell-and-tube heat exchanger is used as a condenser, and vice versa.

[0061] The liquid distribution disc 4 is fixedly arranged relative to the outer cylinder and the inner cylinder, and can be directly fixedly connected to at least one of the outer cylinder and the inner cylinder, or can be kept relatively fixed to the outer cylinder and the inner cylinder through other components. Similarly, the shielding part 5 is fixedly arranged relative to the outer cylinder and the inner cylinder, and can be directly fixedly connected to at least one of the outer cylinder and the inner cylinder, or can be kept relatively fixed to the outer cylinder and the inner cylinder through other components.

[0062] The structure on the liquid distribution disc for passing fluid can be a plurality of liquid distribution holes 40 arranged uniformly and spaced apart on the bottom of the liquid distribution disc 4. Of course, the structure for passing fluid is not limited to holes, and can be slits or other shapes, as long as it can form a plurality of uniform liquid columns or droplets after the liquid working fluid passes through the liquid distribution disc.

[0063] The gas passage G can be arranged at the radial inner side or the radial outer side of the liquid distribution plate 4, or at both the radial inner side and the radial outer side of the liquid distribution plate 4, and the number of the shielding parts 5 can be one or two. For the gas passage G formed between the radial inner end of the liquid distribution plate 4 and the cylinder wall of the inner cylinder 2, the radial inner end of the shielding part corresponding to the gas passage G is sealingly connected to the cylinder wall of the inner cylinder 2, and the radial outer end is spaced from the cylinder wall of the outer cylinder 1; for the gas passage G formed between the radial outer end of the liquid distribution plate 4 and the cylinder wall of the outer cylinder 1, the radial inner end of the shielding part corresponding to the gas passage G is spaced from the cylinder wall of the inner cylinder 2, and the radial outer end is sealingly connected to the cylinder wall of the outer cylinder 1.

[0064] In the tank heat exchanger of the embodiment of the present disclosure, the liquid working medium can be introduced into the tank heat exchanger through the liquid inlet 10 arranged at the axial first end of the outer cylinder 1, and the inner cylinder can be in communication with the gaseous working medium pipeline to enable the gaseous working medium to be introduced into or discharged from the tank heat exchanger, so that the tank heat exchanger can be used as both an evaporator and a condenser.

[0065] When the tank heat exchanger is used as an evaporator, the liquid working medium can flow from the working medium inlet to the first heat exchange tube 31 below the liquid distribution plate 4 through the liquid distribution plate 4; during the downward flow of the liquid working medium, even if part of the working medium droplets fly onto the cylinder walls of the inner cylinder and the outer cylinder due to deflection or splashing, etc., the working medium droplets can directly flow into the liquid distribution plate 4 or be blocked by the shielding part 5 and be introduced into the liquid distribution plate 4 through the shielding part 5, thereby playing a role in recovering the liquid working medium. The gaseous working medium entering the tank heat exchanger through the liquid inlet 10 or vaporized after absorbing heat from the heat exchange tube in the tank heat exchanger can smoothly flow down through the axial space between the shielding part 5 and the liquid distribution plate 4, the gas passage G, and thus the space above the liquid distribution plate 4 and the shielding part 5. Therefore, by arranging the liquid distribution plate 4 and the shielding part 5 and forming a space therebetween for the flow of gas, the influence of the pressure rise of the gaseous working medium on the flow rate of the liquid working medium can be eliminated, and the average flow rate of the liquid working medium when passing through the holes or gaps in the liquid distribution plate 4 can be reduced, thereby playing a role in reducing the pressure drop of the working medium in the heat exchanger.

[0066] When the tank heat exchanger is used as a condenser, the gaseous working medium can flow smoothly through the axial space between the shielding part and the gas passage G after flowing into the annular space between the inner cylinder and the outer cylinder through the working medium inlet, and then flow to the condensation heat exchange above the liquid distribution plate 4 and the shielding part 5; the liquid working medium generated by the condensation of the gaseous working medium can flow down from the liquid distribution plate 4 and be stored at the bottom of the tank heat exchanger.

[0067] Whether as an evaporator or a condenser, the tank heat exchanger provided by the embodiments of the present disclosure has a state of flow of the working medium in both liquid and gaseous phases inside, the gaseous working medium can flow up and down through the axial spacing between the blocking part and the liquid distribution disc and the gas passage, the liquid working medium can flow down through the liquid distribution disc, and the gaseous working medium has an independent flow space, so that the average flow rate of the liquid working medium can be reduced, thereby reducing the pressure drop of the working medium in the heat exchanger. In addition, the blocking part can recover the liquid working medium flowing down the cylinder wall and guide the liquid working medium flowing down the cylinder wall into the liquid distribution disc, thereby reducing the waste of falling film liquid and improving the heat exchange efficiency.

[0068] The two radial ends of the liquid distribution disc 4 can be connected with the cylinder walls of the inner cylinder and the outer cylinder respectively, and only a gas passage needs to be left between the liquid distribution disc and the cylinder wall of at least one of the inner cylinder and the outer cylinder. However, in the process of realizing the present disclosure, the inventor found that, since the outer cylinder and the inner cylinder form a sleeve structure at the first end of the tank heat exchanger, it is very difficult for the liquid distribution disc to be connected with the cylinder walls of the outer cylinder and the inner cylinder at the same time, which is not conducive to the assembly of the entire tank heat exchanger.

[0069] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 7 , one of the radial inner end and the radial outer end of the liquid distribution disc 4 is sealed with one of the cylinder wall of the outer cylinder 1 and the cylinder wall of the inner cylinder 2, and the other of the radial inner end and the radial outer end of the liquid distribution disc 4 forms a gas passage G with the other of the cylinder wall of the outer cylinder 1 and the cylinder wall of the inner cylinder 2.

[0070] The tank heat exchanger of the above embodiments not only can provide a gaseous working medium passage, reduce the pressure drop of the working medium, and recover the liquid working medium, but also only needs to be connected with one of the cylinder walls of the outer cylinder and the inner cylinder on one side, which can reduce the assembly difficulty of the tank heat exchanger, improve the assembly efficiency, and reduce the manufacturing cost.

[0071] Specifically, the gas passage G can be arranged between the radial inner side of the liquid distribution disc 4 and the outer wall of the inner cylinder. In some embodiments, as shown in Figures 1 to 3 , the radial outer end of the liquid distribution disc 4 is sealingly connected with the inner wall of the outer cylinder 1, the radial inner end of the liquid distribution disc 4 forms a gas passage G with the outer wall of the inner cylinder 2, and the radial inner end of the blocking body is fixedly connected with the outer wall of the inner cylinder 2.

[0072] In some embodiments, in a cross section perpendicular to the axial direction of the tank heat exchanger, the gas passage G is annular.

[0073] In the above embodiments, the gas passage G penetrates the circumferential direction of the tank heat exchanger, the flow area of the gaseous working medium is larger, the flow effect is better, and therefore the effect of reducing the pressure drop of the working medium is also better.

[0074] Of course, in other embodiments, the gas passage G can also be discontinuous along the circumferential direction of the tank heat exchanger, as long as it can allow the gaseous working medium to flow. For example, in a cross section perpendicular to the axial direction of the tank heat exchanger, the gas passage G can appear as several discontinuous fan-shaped rings.

[0075] In some embodiments, as shown in FIG. 1, the shielding body is a baffle 51 extending from the connecting end to the free end. Figure 3

[0076] According to the above arrangement, in the use state of the tank heat exchanger, the baffle 51 is arranged horizontally. Figure 3 In the embodiment shown in FIG. 1, the radially inner end of the baffle 51 is fixedly connected to the outer wall of the inner cylinder 2 and forms a seal.

[0077] In some embodiments, as shown in FIG. 1, the shielding body is a baffle 51 extending from the connecting end to the free end. Figure 4

[0078] According to the above arrangement, in the use state of the tank heat exchanger, the baffle 51 is arranged horizontally, and the edge plate 52 can be arranged perpendicularly to the baffle 51 or at an angle to the baffle 51 and can play a certain flow guiding role. Figure 4 In the embodiment shown in FIG. 1, the radially inner end of the baffle 51 is fixedly connected to the outer wall of the inner cylinder 2 and forms a seal, and the edge plate 52 is connected to the radially outer end of the baffle 51 and arranged perpendicularly to the baffle 51, and the shielding part 5 as a whole has an L shape.

[0079] In some embodiments, the shielding body is a baffle 51 extending from the connecting end to the free end towards the direction close to the liquid distribution disc 4.

[0080] According to the above arrangement, in the use state of the tank heat exchanger, the baffle 51 extends from top to bottom and is sealingly connected to the cylinder wall at the upper end, forming a structure similar to a roof shape, facilitating the flow of accumulated liquid working medium on the cylinder wall to the liquid distribution disc, thereby playing a good flow guiding and recycling role. Figure 5 In the embodiment shown in FIG. 1, the radially inner end of the baffle 51 is fixedly connected to the outer wall of the inner cylinder 2 and forms a seal, and the edge plate 52 is connected to the radially outer end of the baffle 51 and arranged perpendicularly to the baffle 51, and the shielding part 5 as a whole has an L shape.

[0081] In some embodiments, the baffle 51 is a flat plate or a curved plate.

[0082] Figure 5 In the embodiment shown in FIG. 1, the baffle 51 is a flat plate, the radially inner end of the baffle 51 is fixedly connected to the outer wall of the inner cylinder 2 and forms a seal, and the baffle 51 extends from the radially inner end to the radially outer end from top to bottom. In some embodiments not shown, the baffle 51 can of course also be a curved plate, for example, the baffle 51 can be a curved plate with a circular arc-shaped or parabolic cross section along the radial direction of the tank heat exchanger.

[0083] ​​In some embodiments, as shown in Figure 6 The tank heat exchanger further comprises a plurality of flow guiding portions 6, which are arranged at intervals on the edge of the shielding portion 5 near the liquid distribution tray 4 and extend towards the liquid distribution tray 4.

[0084] In the above embodiments, the flow guiding portion extends from the edge of the shielding portion near the liquid distribution tray towards the liquid distribution tray, for example, as shown in the embodiments, Figure 6 In some embodiments, the flow guiding portion 6 can be a columnar structure extending vertically up and down, and in some unillustrated embodiments, the flow guiding portion can also be arranged obliquely. By arranging a plurality of spaced flow guiding portions extending towards the liquid distribution tray, the liquid working medium recovered by the shielding portion can flow into the liquid distribution tray under the guidance of the flow guiding portions, thereby playing a good flow guiding role, and along the radial direction of the tank heat exchanger, the flow guiding portions can also play a certain blocking role. Therefore, the flow guiding portions can prevent the liquid droplets of the working medium on the radial edge of the shielding portion from being blown into the gas passage G by the gaseous working medium during the falling process, thereby further reducing the waste of the liquid working medium.

[0085] In some embodiments, the liquid distribution tray 4 has a recessed groove structure recessed from the axial first end to the axial second end of the falling film evaporator. In this case, the flow guiding portion 6 partially extends into the recessed groove structure, or the edge of the flow guiding portion 6 near the axial second end of the falling film evaporator is aligned with the edge of the recessed groove structure near the axial first end of the falling film evaporator along the axial direction of the tank heat exchanger.

[0086] According to the above arrangement, in the use state of the falling film evaporator, the bottom edge of the flow guiding portion 6 is not higher than the top edge of the side wall of the recessed groove structure, which can further enhance the blocking effect of the flow guiding portion and better prevent the gaseous working medium from blowing the liquid droplets of the working medium into the gas passage.

[0087] In some embodiments, the inner cylinder 2 is a cylindrical or polygonal cylinder. In this case, Figure 1 and Figure 2 shows the case when the inner cylinder is a cylindrical, Figure 7 shows the case when the inner cylinder is a polygonal cylinder.

[0088] The polygonal cylinder can be a quadrilateral cylinder, such as a rectangular cylinder or a square cylinder, or a pentagonal cylinder, a hexagonal cylinder, an octagonal cylinder, etc.

[0089] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 7 The tank heat exchanger further comprises a U-shaped tube 7, the plane in which the center line of the U-shaped tube 7 is arranged along the radial direction of the tank heat exchanger, the first end of the U-shaped tube 7 is arranged in the inner cylinder 2 and is connected to the inner cylinder 2, and the second end of the U-shaped tube 7 is used to connect with the gaseous working medium pipeline to introduce or discharge the gaseous working medium.

[0090] In order to install the U-shaped tube with the same radius of the bend section into the inner cylinder, the axial cross-sectional area required by the polygonal inner cylinder is smaller than that of the circular inner cylinder. Therefore, by setting the inner cylinder as a polygonal cylinder, it is beneficial to increase the flow area of the gas passage G and reduce the pressure drop of the working medium. Considering that the gas flow rate in the U-shaped tube will be too high when the tube diameter of the U-shaped tube is too small, and the tube diameter of the U-shaped tube is limited by the radius of the bend section, by setting the inner cylinder as a polygonal cylinder, the tube diameter of the U-shaped tube can be as large as possible without reducing the radius of the bend section, which is beneficial to reduce the flow rate of the gaseous working medium and improve the heat exchange performance.

[0091] Compared with installing the U-shaped tube into a circular cylinder, the axial cross-sectional area required for installing the U-shaped tube into a polygonal cylinder is smaller. The flow rate of the gaseous working medium in the gas passage G is reduced.

[0092] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 7 , the working medium inlet includes a liquid inlet 10 arranged at the axial first end of the outer cylinder 1 for introducing the liquid working medium, and the working medium outlet includes a gaseous working medium outlet 70 in communication with the inner cylinder 2 for discharging the gaseous working medium, and / or, the working medium inlet includes a gaseous working medium outlet 70 in communication with the inner cylinder 2 for introducing the gaseous working medium, and the working medium outlet includes a liquid outlet 13 arranged at the axial second end of the outer cylinder 1 for discharging the liquid working medium.

[0093] In the above embodiments, the gaseous working medium outlet 70 can be located at the second end of the U-shaped tube 7.

[0094] On the basis of arranging the first heat exchange tube 31, the tank-type heat exchanger can of course also include more heat exchange tubes arranged at different positions along the axial direction of the tank-type heat exchanger.

[0095] In some embodiments, the tank-type heat exchanger further includes a second heat exchange tube 32 and / or a third heat exchange tube 9. The second heat exchange tube 32 is coiled in the outer cylinder 1 and located on the side of the shielding part 5 away from the liquid distribution disc 4. The third heat exchange tube 9 is coiled in the outer cylinder 1 and located on the side of the first heat exchange tube 31 away from the liquid distribution disc 4.

[0096] Figure 1 , Figure 2 and Figure 7 In the embodiments shown in , the tank-type heat exchanger includes the first heat exchange tube 31, the second heat exchange tube 32 and the third heat exchange tube 9, and the tank-type heat exchanger further includes a liquid distributor 8. Along the axial direction of the falling film evaporator, the liquid distributor 8, the second heat exchange tube 32, the shielding part 5, the liquid distribution disc 4, the first heat exchange tube 31 and the third heat exchange tube 9 are sequentially arranged from top to bottom. The first heat exchange tube 31 and the second heat exchange tube 32 jointly constitute the falling film zone heat exchange tube 3, and the third heat exchange tube 9 constitutes the full liquid zone heat exchange tube.

[0097] Figure 1 , Figure 2and Figure 7 In the embodiment shown, when the tank heat exchanger is used as an evaporator, liquid working medium enters the outer cylinder 1 from the liquid inlet 10 and the liquid distributor 8, exchanges heat with the second heat exchange tube 32, and the gaseous working medium generated by the evaporation of the liquid working medium flows to the inner cylinder 2 and the U-shaped tube 7 through the axial gap between the blocking part 5 and the liquid distribution disc 4, and is discharged from the gaseous working medium outlet 70. The remaining liquid working medium flows to the first heat exchange tube 31 and the third heat exchange tube 9 through the liquid distribution disc 4 for further heat exchange. When the tank heat exchanger is used as a condenser, the gaseous working medium enters the outer cylinder 1 from the gaseous working medium outlet 70, the U-shaped tube 7, and the inner cylinder 2, exchanges heat with the third heat exchange tube 9 and the first heat exchange tube 31 in the outer cylinder 1, and the liquid working medium generated by the condensation of the gaseous working medium is stored at the bottom of the tank heat exchanger and can be discharged from the liquid outlet 13. The remaining gaseous working medium flows to the annular area between the outer cylinder 1 and the inner cylinder 2 through the gas channel G and the axial gap between the blocking part 5 and the liquid distribution disc 4, and exchanges heat with the second heat exchange tube 32.

[0098] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 7 , the outer cylinder 1 includes a cylinder body 11, a first end cover 12, and a second end cover 14. The cylinder body 11 is arranged along the radial direction of the tank heat exchanger and can be divided into two halves. The first end cover 12 is closed to the axial first end of the cylinder body 11, and the second end cover 14 is closed to the axial second end of the cylinder body 11. The axial first end of the inner cylinder 2 is connected to the first end cover 12.

[0099] For the tank heat exchanger with the structure shown in Figure 1 , Figure 2 and Figure 7 , when the tank heat exchanger is assembled, according to the related technology known to the inventors, in order to install the coiled heat exchange tube into the outer cylinder, it is generally necessary to divide the cylinder body 11 of the outer cylinder into two halves along the cross section shown in Figure 1 , Figure 2 and Figure 7 Figure 1 Figure 2 Figure 7 Figure 1 Figure 2 Figure 7 , plug the tube opening at one end of the heat exchange tube into the corresponding opening in one of the two halves, then cover the other half and fixedly connect it with the first half, and finally close and connect the two end covers to the axial two ends of the cylinder body. Therefore, it is difficult to simultaneously seal and connect the liquid distribution disc to the inner cylinder and the outer cylinder.

[0100] Based on the scheme of the above-mentioned embodiments of the present disclosure, the liquid distribution disc 4 only needs to be sealed and connected to the outer cylinder 1, and the inner cylinder 2 is connected to the first end cover 12 and is not connected to the liquid distribution disc 4. Therefore, when the inner cylinder 2 is installed, it only needs to be inserted into the cylinder body 11 from top to bottom together with the first end cover 12, thereby further reducing the installation difficulty of the liquid distribution disc.

[0101] Some embodiments of the present disclosure also provide an air conditioning system comprising the aforementioned tank heat exchanger. The air conditioning system provided by the embodiments of the present disclosure has the advantages of the aforementioned tank heat exchanger accordingly.

[0102] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present disclosure rather than limit the present disclosure; although the present disclosure has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present disclosure can be modified or equivalent replacements can be made to some technical features, and all of these should be covered in the technical solutions of the present disclosure.

Claims

1. A shell-and-tube heat exchanger, characterized by The tank heat exchanger comprises: an outer cylinder (1); an inner cylinder (2) in communication with the outer cylinder (1), the outer cylinder (1) and the inner cylinder (2) are arranged in parallel with the axis and form an annular space between them; a first heat exchange pipe (31) coiled in the outer cylinder (1); a liquid distribution disc (4) fixedly arranged in the annular space relative to the outer cylinder (1) and the inner cylinder (2) and located on the side of the first heat exchange pipe (31) close to the first end of the tank heat exchanger in the axial direction, the radial outer end of the liquid distribution disc (4) forms a gas passage (G) with the cylinder wall of the outer cylinder (1), and / or the radial inner end of the liquid distribution disc (4) forms a gas passage (G) with the cylinder wall of the inner cylinder (2); and a shielding part (5) fixedly arranged in the annular space relative to the outer cylinder (1) and the inner cylinder (2) and axially spaced from the liquid distribution disc (4), the shielding part (5) comprises a shielding body corresponding to the gas passage (G), the shielding body is located on the side of the liquid distribution disc (4) facing the first end of the tank heat exchanger in the axial direction, and extends in the radial direction of the tank heat exchanger, the shielding body completely covers the corresponding gas passage (G), one of the radial inner end and the radial outer end of the shielding body is a connected end, and the other is a free end, the connected end is sealingly connected with one of the cylinder wall of the inner cylinder (2) and the cylinder wall of the outer cylinder (1), and the free end is spaced from the other of the cylinder wall of the inner cylinder (2) and the cylinder wall of the outer cylinder (1).

2. The shell-and-tube heat exchanger of claim 1, wherein, One of the radial inner end and the radial outer end of the liquid distribution disc (4) forms a seal with one of the cylinder wall of the outer cylinder (1) and the cylinder wall of the inner cylinder (2), and the other of the radial inner end and the radial outer end of the liquid distribution disc (4) forms the gas passage (G) with the other of the cylinder wall of the outer cylinder (1) and the cylinder wall of the inner cylinder (2).

3. The tank heat exchanger according to claim 2, wherein the radial outer end of the liquid distribution disc (4) is sealingly connected with the inner wall of the outer cylinder (1), and the radial inner end of the liquid distribution disc (4) forms the gas passage (G) with the outer wall of the inner cylinder (2); the radial inner end of the shielding body is fixedly connected with the outer wall of the inner cylinder (2).

4. The tank heat exchanger of claim 1, wherein In a cross section perpendicular to the axial direction of the tank heat exchanger, the gas passage (G) is annular.

5. The shell-and-tube heat exchanger of claim 1, wherein, The shielding body is a baffle plate (51) perpendicular to the axial direction of the tank heat exchanger.

6. The shell-and-tube heat exchanger of claim 5, wherein, The shielding part (5) further comprises an edge plate (52) connected to the free end of the shielding body and extending towards the second end of the tank heat exchanger in the axial direction.

7. The shell-and-tube heat exchanger of claim 1, wherein, The shielding body is a baffle plate (51) extending from the connected end to the free end towards the liquid distribution disc (4).

8. The shell-and-tube heat exchanger of claim 7, wherein, The baffle plate (51) is a flat plate or a curved plate.

9. The shell-and-tube heat exchanger according to any one of claims 1 to 8, characterized in that Further comprising a plurality of flow guiding parts (6) arranged at intervals on the edge of the shielding part (5) on the side close to the liquid distribution disc (4) and extending towards the liquid distribution disc (4).

10. The shell-and-tube heat exchanger according to claim 9, characterized in that, the liquid equalizing disc (4) is in a groove structure recessed from an axial first end to an axial second end of the shell-and-tube heat exchanger; wherein the flow guide (6) partially extends into the groove structure, or an edge of the flow guide (6) close to the axial second end of the shell-and-tube heat exchanger is axially aligned with an edge of the groove structure close to the axial first end of the shell-and-tube heat exchanger.

11. The shell-and-tube heat exchanger according to any one of claims 1 to 8, characterized in that the inner cylinder (2) is a cylindrical or polygonal cylinder.

12. The shell-and-tube heat exchanger of claim 11, wherein, a U-shaped tube (7) is further included, a tube center line of the U-shaped tube (7) is disposed along a radial direction of the shell-and-tube heat exchanger, a first end of the U-shaped tube (7) is disposed in the inner cylinder (2) and is in communication with the inner cylinder (2), and a second end of the U-shaped tube (7) is used to be connected with a gaseous working medium pipeline to introduce or discharge gaseous working medium.

13. The shell-and-tube heat exchanger according to any one of claims 1 to 8, characterized in that, the working medium inlet includes a liquid inlet (10) disposed at an axial first end of the outer cylinder (1) and used to introduce liquid working medium, and the working medium outlet includes a gaseous working medium port (70) in communication with the inner cylinder (2) and used to discharge gaseous working medium; and / or the working medium inlet includes a gaseous working medium port (70) in communication with the inner cylinder (2) and used to introduce gaseous working medium, and the working medium outlet includes a liquid outlet (13) disposed at an axial second end of the outer cylinder (1) and used to discharge liquid working medium.

14. The shell-and-tube heat exchanger of any one of claims 1 to 8, wherein, further including: a second heat exchange tube (32) coiled in the outer cylinder (1) and located on a side of the shielding part (5) away from the liquid equalizing disc (4); and / or a third heat exchange tube (9) coiled in the outer cylinder (1) and located on a side of the first heat exchange tube (31) away from the liquid equalizing disc (4).

15. The shell-and-tube heat exchanger of any one of claims 1 to 8, wherein, the outer cylinder (1) includes a cylinder body (11), a first end cover (12) and a second end cover (14), the cylinder body (11) is disposed axially splittable along a radial direction of the shell-and-tube heat exchanger, the first end cover (12) is closed at an axial first end of the cylinder body (11), the second end cover (14) is closed at an axial second end of the cylinder body (11), and an axial first end of the inner cylinder (2) is connected to the first end cover (12).

16. An air conditioning system, characterised in that including the shell-and-tube heat exchanger according to any one of claims 1 to 15.

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