Liquid distributors, heat exchangers and air conditioners

Abstract

The present invention discloses a liquid distributor, a heat exchanger and an air conditioner, which relate to the field of air conditioning and are used to optimize the structure of the liquid distributor. The liquid distributor includes a housing, which has a first flow channel and a second flow channel that are fluid-sealed with each other; the first flow channel is configured to allow gaseous refrigerant to pass through the housing; the second flow channel is configured to achieve liquid equalization for the liquid refrigerant entering the inner cavity of the housing. The liquid distributor provided by the above technical solution has a first flow channel and a second flow channel that function relatively independently. When the liquid distributor is used for heating and condensation, the gaseous refrigerant directly passes through the first flow channel to the location of the heat exchange tube for heat exchange. When the liquid distributor is used for cooling and evaporation, the liquid refrigerant exchanges heat with the heat exchange tube of the heat exchanger after passing through the second flow channel for liquid equalization. The liquid distributor provided by the above technical solution has good performance under both evaporation and condensation conditions.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and in particular to a liquid distributor, a heat exchanger and an air conditioner. Background Art

[0002] Evaporators have various structural forms, among which the falling film evaporator has outstanding heat exchange performance. Its advantages of saving refrigerant, uniform heat exchange, high space utilization, and low suction liquid make the falling film evaporator widely used in the field of heat exchange.

[0003] In cooling system units, the falling film evaporator structure is relatively mature. However, in heat pump system units, the falling film evaporator needs to be able to take into account both evaporation and condensation.

[0004] The inventors have found that there are at least the following problems in the prior art: the existing liquid distribution plate is a whole flat rectangular or other flat form, and this structure can only meet the liquid distribution effect and fluid flow mode under evaporation conditions. Under condensation conditions, the liquid distributor of this structure will prevent the gaseous refrigerant from exchanging heat with the heat exchange tube, making the falling film evaporator unable to achieve the required heat exchange effect. Summary of the invention

[0005] The present invention provides a liquid distributor, a heat exchanger and an air conditioner, which are used to optimize the structure of the liquid distributor.

[0006] Some embodiments of the present invention provide a liquid dispenser, comprising:

[0007] The box body has a first flow channel and a second flow channel which are fluid-sealed with each other; the first flow channel is configured to allow gaseous refrigerant to pass through the box body; and the second flow channel is configured to achieve liquid homogenization for liquid refrigerant entering the inner cavity of the box body.

[0008] In some embodiments, the first flow channel is constructed to penetrate the thickness direction of the box body itself to allow gaseous refrigerant to pass through the box body; and / or, the second flow channel includes a liquid inlet, an inner cavity and a liquid equalizing hole, and the liquid inlet and the liquid equalizing hole are both connected to the inner cavity.

[0009] In some embodiments, the first flow channel includes one-to-one corresponding air inlets and air outlets, and the air inlets of the first flow channel are evenly distributed in the box body; and / or the number of liquid inlets of the second flow channel is less than the number of liquid distribution holes of the second flow channel.

[0010] In some embodiments, the housing comprises:

[0011] A bottom plate, provided with the liquid equalizing hole;

[0012] A side wall is mounted on an edge of the bottom plate, and the bottom plate and the side wall together form an inner cavity with an opening; and

[0013] A cover plate covers the opening of the inner cavity.

[0014] In some embodiments, the housing further comprises:

[0015] A through piece is disposed in the inner cavity, and the top of the through piece is sealed and connected to the cover plate, and the bottom of the through piece is sealed and connected to the bottom;

[0016] Among them, the first flow channel includes a first through groove, a second through groove and a third through groove; the through piece has the first through groove, the bottom plate is provided with the second through groove connected to the first through groove, and the cover plate is provided with the third through groove connected to the first through groove.

[0017] In some embodiments, the side wall is also provided with a liquid equalization hole.

[0018] In some embodiments, the bottom plate is constructed in a stepped shape; along the liquid inlet direction of the liquid refrigerant, the center of the bottom plate along its own length direction is higher than the two ends of the bottom plate along its own length direction; the liquid inlet is located above the center of the bottom plate along its own length direction.

[0019] In some embodiments, except for the steps located at both ends of the bottom plate in the length direction, the edge of at least one step of the bottom plate is provided with a flange, and the flange forms a groove for accommodating the liquid refrigerant.

[0020] In some embodiments, each step of the bottom plate is installed with a plurality of the through-pieces, and the through-pieces are arranged at intervals.

[0021] In some embodiments, the flow area of ​​each of the first flow channels is more than five times the flow area of ​​each of the liquid equalizing holes.

[0022] An embodiment of the present invention further provides a heat exchanger, comprising the liquid distributor provided by any technical solution of the present invention.

[0023] In some embodiments, the heat exchanger further comprises:

[0024] a housing, wherein the housing of the liquid distributor is installed inside the housing; and

[0025] A heat exchange tube is installed inside the shell and located below the liquid distributor;

[0026] The gaseous refrigerant entering the shell flows toward the heat exchange tube via the first flow channel of the liquid distributor.

[0027] An embodiment of the present invention further provides an air conditioner, comprising the heat exchanger provided by any technical solution of the present invention.

[0028] The liquid distributor provided by the above technical solution has a first flow channel and a second flow channel that function relatively independently. The first flow channel serves as a channel for the gaseous refrigerant to flow through, and the second flow channel serves as a liquid equalization channel. When the liquid distributor is used for heating and condensation, the gaseous refrigerant is not evenly distributed, but directly passes through the first flow channel to the location of the heat exchange tube for heat exchange. When the liquid distributor is used for refrigeration and evaporation, the liquid refrigerant exchanges heat with the heat exchange tube of the heat exchanger after being evenly distributed through the second flow channel. The liquid distributor provided by the above technical solution has good performance under both evaporation and condensation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 A schematic diagram of the main structure of a liquid distributor for a heat exchanger provided in some embodiments of the present invention;

[0031] Figure 2 A schematic diagram of the side structure of a liquid distributor for a heat exchanger provided in some embodiments of the present invention;

[0032] Figure 3 A schematic diagram of a three-dimensional structure of a liquid distributor provided in some embodiments of the present invention;

[0033] Figure 4 A schematic diagram of the exploded structure of a liquid distributor provided in some embodiments of the present invention;

[0034] Figure 5 A schematic diagram of the main structure of a liquid distributor provided in some embodiments of the present invention;

[0035] Figure 6 A schematic diagram of a top view of a liquid distributor provided in some embodiments of the present invention;

[0036] Figure 7 A schematic diagram of a three-dimensional structure of a liquid distributor provided in some embodiments of the present invention without a liquid inlet pipe and a cover plate;

[0037] Figure 8 for Figure 7 Schematic diagram of the main structure;

[0038] Fig. 9 for Figure 8 A local enlarged schematic diagram;

[0039] Fig.10 for Figure 8 A schematic diagram of a top view structure;

[0040] Fig.11 for Fig.10A local enlarged schematic diagram of area B. DETAILED DESCRIPTION

[0041] Combine the following Figures 1 to 11 The technical solution provided by the present invention is described in more detail.

[0042] The inventor found that the current liquid distributor structure can only meet the working requirements of the single cooling system unit. In this case, the liquid refrigerant is evenly distributed at the liquid distributor, and the evenly distributed refrigerant flows to the heat exchange tube to exchange heat with the heat exchange tube. However, when the liquid distributor is used in a heating system, the refrigerant entering the heat exchanger is a gaseous refrigerant, and the gaseous refrigerant does not need to be evenly distributed. In this case, when the heat exchanger is used in a condensing condition, the high-temperature and high-pressure gaseous refrigerant enters the top of the shell of the heat exchanger through the air outlet under the evaporation condition. Since the installation position of the liquid distributor is higher than the position of the heat exchange tube, the high-temperature and high-pressure gaseous refrigerant enters the top of the shell through the air outlet under the evaporation condition. The liquid distributor and the evenly distributed plate in the related art only have very small evenly distributed holes. The liquid distributor will hinder the downward flow of the gaseous refrigerant, so that the gaseous refrigerant cannot smoothly flow downward to the heat exchange tube, and the gaseous refrigerant cannot fully contact the heat exchange tube, resulting in poor heat exchange effect of the heat exchange tube and low utilization rate of the heat exchange area of ​​the heat exchanger. In order to improve this phenomenon, the inventors proposed the following technical solution. In order to clearly describe the structure of the liquid distributor, the liquid distributor is applied to a falling film heat exchanger as an example. The heat exchange tubes of the falling film heat exchanger are located below the liquid distributor.

[0043] See also Figures 1 to 4 The embodiment of the present invention provides a liquid distributor, comprising a housing 1, wherein the housing 1 has a first flow channel 11 and a second flow channel 12 which are fluid-tightly sealed from each other. The first flow channel 11 is configured to allow gaseous refrigerant to pass through the housing 1; the second flow channel 12 is configured to distribute liquid refrigerant entering the inner cavity 122 of the housing 1.

[0044] In some embodiments, see Figure 3 and Figure 4 The first flow channel 11 is configured to penetrate the thickness direction of the housing 1 itself to allow the gaseous refrigerant to pass through the housing 1. The second flow channel 12 includes a liquid inlet 121, an inner cavity 122, and a liquid equalizing hole 123, and the liquid inlet 121 and the liquid equalizing hole 123 are both connected to the inner cavity 122. The second flow channel 12 is configured to achieve liquid equalization for the liquid refrigerant entering the inner cavity 122 of the housing 1.

[0045] The first flow channel 11 serves as a channel for the gaseous refrigerant to flow through, and the second flow channel 12 serves as a liquid equalization channel. When the liquid distributor is used for heating, the gaseous refrigerant is not evenly distributed, but directly passes through the first flow channel 11 to the position where the heat exchange tube 4 is located for heat exchange. In this case, the performance required of the liquid distributor is to try not to affect the normal flow of the gaseous refrigerant. Therefore, the first flow channel 11 is not connected to the inner cavity 122 of the cabinet 1, but is directly connected to the outside of the cabinet 1. When the liquid distributor is used for refrigeration, the liquid refrigerant exchanges heat with the heat exchange tube 4 of the heat exchanger after being evenly distributed through the second flow channel 12. Here, the so-called inner cavity 122 of the cabinet 1 refers to a chamber for accommodating liquid refrigerant. Combined with the cuboid structure of the shell 3 introduced later, the inner cavity 122 of the cabinet 1 is the part of the interior of the cuboid that is directly connected to the liquid equalization hole 123. The refrigerant passing through the first circulation will not reach the liquid equalization hole 123, nor will it pass through the liquid equalization hole 123. In other words, in the liquid distributor provided by the above technical solution, the first flow channel 11 and the second flow channel 12 are fluid-tightly sealed with each other. After the gaseous refrigerant enters from the top of the shell 3, it directly passes through the first flow channel 11 and directly reaches the position where the heat exchange tube 4 of the heat exchanger is located for heat exchange, thereby improving the heat exchange efficiency under condensing conditions. The gaseous refrigerant does not need to pass through the liquid balancing hole 123. After the liquid refrigerant passes through the liquid balancing hole 123 of the second flow channel 12, it falls to the heat exchange tube 4 located below the liquid distributor under the action of gravity for heat exchange operation.

[0046] See also Figure 4 In some embodiments, the air inlet of the first flow channel 11 corresponds to the air outlet one by one, and the air inlet of the first flow channel 11 is evenly distributed in the box body 1. The first flow channel 11 has multiple air inlets and air outlets, so that the gaseous refrigerant can pass through the box body 1 smoothly. The flow area of ​​the air inlet of the first flow channel 11 can be the same as the flow area of ​​the air outlet, so that the pressure of the gaseous refrigerant hardly changes when passing through. Optionally, the first flow channel 11 is evenly distributed in the box body 1, so that the gaseous refrigerant can pass through the box body 1 smoothly.

[0047] See also Figure 4 In some embodiments, the number of the liquid inlets 121 of the second flow channel 12 is less than the number of the liquid balancing holes 123 of the second flow channel 12. The number of the liquid inlets 121 is, for example, one or two. The number of the liquid balancing holes 123 is much greater than the number of the liquid inlets 121. Moreover, the flow area of ​​the liquid balancing holes 123 is much smaller than the flow area of ​​the liquid inlets 121. For example, the flow area of ​​the liquid balancing holes 123 is less than 1 / 10 of the flow area of ​​the liquid inlet 121.

[0048] See also Figure 4In some embodiments, the flow area of ​​each first flow channel 11 is more than five times the flow area of ​​each liquid balancing hole 123. The size of the first flow channel 11 is set as large as possible under the premise of meeting the structural strength and processing requirements, so as to reduce the resistance encountered by the gaseous refrigerant when passing through, so that the gaseous refrigerant can reach the position where the heat exchange tube 4 is located as smoothly as possible.

[0049] See also Fig. 9 and Fig.11 , the interval H4 of the liquid balancing holes 123 is 8 mm to 20 mm, specifically 8 mm, 10 mm, 15 mm, 18 mm, and 20 mm. Alternatively, the location of the liquid balancing holes 123 can also be determined according to the interval of the heat exchange tubes 4, so that the liquid balancing holes 123 face the center of the heat exchange tubes 4. The diameter d of the liquid balancing holes 123 is 1.5 mm to 3.5 mm, specifically 1.5 mm, 2 mm, 2.5 mm, and 3.5 mm.

[0050] See also Figure 4 In some embodiments, the box body 1 includes a bottom plate 13, a side wall 14 and a cover plate 15. The bottom plate 13 is provided with a liquid balancing hole 123. The side wall 14 is installed on the edge of the bottom plate 13, and the bottom plate 13 and the side wall 14 together form an inner cavity 122 with an opening; the cover plate 15 covers the opening of the inner cavity 122. The side wall 14 can also be provided with a liquid balancing hole 123. The box body 1 adopts the above structure, the size of the bottom plate 13 is relatively large, and the liquid balancing area is large, so it can well meet the liquid balancing requirements of the liquid refrigerant.

[0051] See also Figure 4 In some embodiments, the housing 1 further includes a through piece 16, which is disposed in the inner cavity 122, and the top of the through piece 16 is sealed and connected to the cover plate 15, and the bottom of the through piece 16 is sealed and connected to the bottom. The first flow channel 11 includes a first through groove 111, a second through groove 112, and a third through groove 113. The through piece 16 has a first through groove 111, the bottom plate 13 is provided with a second through groove 112 communicating with the first through groove 111, and the cover plate 15 is provided with a third through groove 113 communicating with the first through groove 111. The inlet of the third through groove 113 serves as an air inlet of the first flow channel 11. The outlet of the second through groove 112 serves as an air outlet of the first flow channel 11. After the gaseous refrigerant enters the shell 3 through the top of the shell 3 of the heat exchanger introduced later, it flows directly through the third through groove 113, the first through groove 111, and the second through groove 112 through the liquid distributor, and then reaches the heat exchange tube 4 for heat exchange. The gaseous refrigerant does not need to enter the inner cavity 122 of the box 1 of the liquid distributor. The above technical solution enables the gaseous refrigerant to pass through the liquid distributor smoothly under condensing conditions, improving the circulation of gas under condensing conditions.

[0052] See also Figure 5 , Figure 8 and Fig. 9 In some embodiments, the bottom plate 13 is constructed in a stepped shape; along the liquid inlet direction of the liquid refrigerant (i.e. Figure 5 , Figure 8 and Fig. 9 The center of the bottom plate 13 along its own length direction is higher than both ends of the bottom plate 13 along its own length direction. The liquid inlet 121 is located above the center of the bottom plate 13 along its own length direction.

[0053] The number of steps that the liquid balancing plate is evenly divided into in the length direction of the bottom plate 13 is determined according to the total length of the liquid distributor. Fig. 9 and Fig.11 , the liquid equalizing plate is evenly divided into 7 steps, and the bottom surface of the liquid equalizing plate area facing the liquid inlet 121 is the highest. The lower the bottom surface of the liquid equalizing plate is, the lower it is towards the two ends in the length direction. The height difference H1 of the bottom surface of each step of the liquid equalizing plate is 10mm~20mm, specifically 10mm, 15mm, 18mm, and 20mm. The plane of each step of the liquid equalizing plate is processed into a groove 131 structure, and the depth H2 of the groove 131 is 5mm~10mm, specifically 5mm, 6mm, 7mm, 8mm, and 10mm.

[0054] See also Fig. 9 and Fig.11 The length H6 of each step along the length direction of the bottom plate 13 is 200mm-300mm, which is determined according to the overall length of the bottom plate 13 and the number of steps, and is specifically 200mm, 220mm, 260mm, 280mm, and 300mm. The width H8 of each step of the bottom plate 13 is 8mm-15mm, and is specifically 8mm, 10mm, 12mm, and 15mm.

[0055] In the above technical solution, the bottom plate 13 of the liquid distributor is a stepped structure with a high middle and low ends. It descends from the bottom of the liquid inlet 121 to the two ends in the length direction. The liquid inlet 121 is located above the center of the bottom plate 13 along its own length direction. When the refrigerant enters through the liquid inlet 121, it drips to the center of the bottom plate 13 along its own length direction under the action of its own gravity; then as the amount of liquid refrigerant increases, it slowly flows to the two ends of the bottom plate 13 along the length direction. The bottom plate 13 adopts the above structural form, so that the entire surface of the bottom plate 13 can be covered with liquid refrigerant, eliminating the heat exchange dead zone, making the liquid distribution area of ​​the refrigerant larger, the liquid distribution efficiency higher, and the liquid distribution effect better. The refrigerant that has been distributed on the entire surface of the bottom plate 13 will subsequently drip downward under the action of its own gravity, so that each section of the heat exchange tube 4 in the entire length direction of the heat exchange tube 4 can fully contact with the refrigerant, thereby improving the heat exchange area and heat exchange efficiency.

[0056] See also Figure 8 and Fig. 9In some embodiments, except for the steps at both ends of the bottom plate 13 in the length direction, the edge of at least one step of the bottom plate 13 is provided with a flange 130, and the flange 130 forms a groove 131 for accommodating the liquid refrigerant.

[0057] A groove 131 structure is processed on each step surface, so that after each groove 131 at a higher position is filled, the height difference principle is used to make the remaining liquid refrigerant flow evenly in a stepped manner to the two ends of the liquid equalizing plate, and the refrigerant will flow to the next groove 131 at a lower position. This structure improves the liquid distribution effect of the liquid equalizing plate of the liquid distributor in the length direction. At the same time, the two ends of the heat exchange tube 4 can also fully contact the refrigerant for heat exchange, eliminating the heat exchange dead zone at both ends of the heat exchange tube 4 and improving the utilization rate of the heat exchange area. In addition, the above technical solution allows each area of ​​the liquid equalizing plate to store a certain amount of liquid refrigerant, improves the evaporation heat exchange efficiency, and makes full use of each position of the bottom plate 13 to increase the liquid distribution area, improve the liquid distribution effect, and reduce the phenomenon of the refrigerant flowing directly to other positions without liquid distribution.

[0058] See also Figures 1 to 4 In some embodiments, each step of the bottom plate 13 is installed with a plurality of through-pieces 16 , and the through-pieces 16 are arranged at intervals.

[0059] The number of through-pieces 16 located on each step is 4 to 8, and the through-pieces 16 are constructed as a long strip structure, and the length direction of the through-pieces 16 is parallel to the length direction of the bottom plate 13. The through-pieces 16 are arranged at both ends of the bottom plate 13 in the width direction, and the other areas in the width direction of the bottom plate 13, especially the middle area, are provided with liquid equalization holes 123 in rows.

[0060] The number of through-pieces 16 is directly positively correlated with the number of first flow channels 11. Providing a plurality of through-pieces 16 can increase the number of first flow channels 11, so that the gaseous refrigerant can flow smoothly to the heat exchange tubes 4 without being blocked by the liquid distributor.

[0061] See also Fig. 9 and Fig.11 , located on the same step, the spacing H5 between two adjacent ventilation grooves along the width direction of the bottom plate 13 is 25mm to 40mm, specifically 25mm, 30mm, 35mm, and 40mm.

[0062] See also Fig. 9 and Fig.11, the width H3 of the first flow channel 11 is 8mm to 15mm, preferably 10mm; the length H7 of the first flow channel 11 is 150mm to 200mm, which can be determined according to the length of each step of the bottom plate 13, such as 150mm, 180mm, 190mm, and 200mm. The above parameter range takes into account the limitation of the width of each step, and combines the flow rate and flow velocity of the gaseous refrigerant under condensing conditions. The use of the above parameters can make the performance of the liquid distributor better.

[0063] See also Fig. 9 In some embodiments, a liquid balancing hole 123 is also provided on the side of the through-piece 16, so that the heat exchange tube 4 located below the first flow channel 11 can also fully contact with the liquid refrigerant, thereby improving the utilization rate of the heat exchange area. Since the first flow channel 11 is hollow and cannot store liquid refrigerant, the heat exchange tube 4 directly below the first flow channel 11 cannot fully contact with the refrigerant. Therefore, the liquid balancing hole 123 is provided at the bottom of the groove 131 of each step of the bottom plate 13 and the side of the first flow channel 11. The liquid refrigerant flows out from the side of the first flow channel 11 and drips onto the heat exchange tube 4 directly below the first flow channel 11, so that the liquid refrigerant can evenly contact each row of heat exchange tubes 4, increasing the heat exchange area to improve the heat exchange utilization rate.

[0064] See also Figures 1 to 4 In some embodiments, the liquid distributor further includes a liquid inlet pipe 2, which is fixedly connected to the housing 1 and communicates with the liquid inlet 121 of the housing 1. The liquid inlet pipe 2 is provided so that the liquid refrigerant can smoothly flow into the second channel.

[0065] An embodiment of the present invention further provides a heat exchanger, comprising a liquid distributor provided by any technical solution of the present invention.

[0066] In some embodiments, the heat exchanger also includes a shell 3 and a heat exchange tube 4. The housing 1 of the liquid distributor is installed inside the shell 3. The heat exchange tube 4 is installed inside the shell 3, and the heat exchange tube 4 is located below the liquid distributor. Among them, the gaseous refrigerant entering the shell 3 flows to the heat exchange tube 4 through the first flow channel 11 of the liquid distributor. The shell 3 has a first opening 31 and a second opening 32. The first opening 31 serves as a gaseous refrigerant outlet in the evaporation condition and as a gaseous refrigerant outlet in the condensation condition. The second opening 32 serves as a liquid refrigerant inlet in the condensation condition.

[0067] An embodiment of the present invention further provides an air conditioner, comprising a heat exchanger provided by any technical solution of the present invention.

[0068] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid distributor, characterized in that: include: A box (1) having a first flow channel (11) and a second flow channel (12) which are fluid-tightly sealed from each other; the second flow channel (12) comprises a liquid inlet (121), an inner cavity (122) and a liquid equalizing hole (123); the first flow channel (11) is configured to allow gaseous refrigerant to pass through the box (1); the second flow channel (12) is configured to equalize the liquid refrigerant entering the inner cavity (122) of the box (1); The box (1) comprises: A bottom plate (13) provided with the liquid equalizing hole (123); A side wall (14) is mounted on an edge of the bottom plate (13), and the bottom plate (13) and the side wall (14) together form an inner cavity (122) having an opening; and A cover plate (15) covering the opening of the inner cavity (122); The box (1) also includes: A through piece (16) is disposed in the inner cavity (122), wherein the top of the through piece (16) is sealedly connected to the cover plate (15), and the bottom of the through piece (16) is sealedly connected to the bottom plate (13); The first flow channel (11) comprises a first through groove (111), a second through groove (112) and a third through groove (113); the through member (16) has the first through groove (111), the bottom plate (13) is provided with the second through groove (112) connected to the first through groove (111), and the cover plate (15) is provided with the third through groove (113) connected to the first through groove (111).

2. The liquid dispenser according to claim 1, characterized in that: The first flow channel (11) is constructed to penetrate the thickness direction of the box body (1) itself to allow gaseous refrigerant to pass through the box body (1); and / or the liquid inlet (121) and the liquid equalizing hole (123) are both connected to the inner cavity (122).

3. The liquid dispenser according to claim 1, characterized in that: The first flow channel (11) comprises an air inlet and an air outlet in one-to-one correspondence, and the air inlets of the first flow channel (11) are evenly distributed on the box body (1); and / or the number of the liquid inlets (121) of the second flow channel (12) is less than the number of the liquid balancing holes (123) of the second flow channel (12).

4. The liquid dispenser according to claim 1, characterized in that: The side wall (14) is also provided with a liquid equalizing hole (123).

5. The liquid dispenser according to claim 1, characterized in that: The bottom plate (13) is constructed in a stepped shape; along the liquid inlet direction of the liquid refrigerant, the center of the bottom plate (13) along its own length direction is higher than the two ends of the bottom plate (13) along its own length direction; the liquid inlet (121) is located above the center of the bottom plate (13) along its own length direction.

6. The liquid distributor according to claim 5, characterized in that: In addition to the steps located at both ends of the bottom plate (13) in the length direction, the edge of at least one step of the bottom plate (13) is provided with a flange (130), and the flange (130) forms a groove (131) for accommodating liquid refrigerant.

7. The liquid dispenser according to claim 5, characterized in that: Each step of the bottom plate (13) is mounted with a plurality of the through-pieces (16), and the through-pieces (16) are arranged at intervals.

8. The liquid dispenser according to claim 1, characterized in that: The flow area of ​​each of the first flow channels (11) is more than five times the flow area of ​​each of the liquid balancing holes (123).

9. A heat exchanger, characterized in that: A liquid dispenser comprising any one of claims 1 to 8.

10. The heat exchanger according to claim 9, characterized in that Also includes: A shell (3), wherein the box body (1) of the liquid distributor is installed inside the shell (3); as well as A heat exchange tube (4) installed inside the shell (3) and located below the liquid distributor; The gaseous refrigerant entering the shell (3) flows toward the heat exchange tube (4) via the first flow channel (11) of the liquid distributor.

11. An air conditioner, characterized in that: The heat exchanger comprises any one of claims 9 to 10.

Images