Liquid distribution control device, heat exchanger and air conditioning equipment

Abstract

The application discloses a liquid distribution control device, a heat exchanger and air conditioning equipment, relates to the heat exchange technical field, and solves the technical problem that the liquid level fluctuation and the inlet fluid impact the outside refrigerant of the heat exchange pipe in the prior art, which causes the uneven distribution of the liquid refrigerant on the circumference inner wall of the heat exchange pipe, and influences the falling film evaporator heat exchange efficiency. The liquid distribution control device comprises a control ring, the control ring is arranged on the outside of a heat exchange pipe of a heat exchanger and is fixed on a first tube plate, the heat exchange pipe extends out of the first tube plate, a liquid storage space is formed among the control ring, the heat exchange pipe and the first tube plate, and an opening is further arranged on the control ring; the refrigerant in a tube box of the heat exchanger enters the liquid storage space through the opening, and the refrigerant in the liquid storage space enters the heat exchange pipe. The liquid distribution control device can make the liquid level in the liquid storage space stable through the isolation effect of the control ring, thereby enhancing the uniformity of the liquid film thickness of the inner wall of the heat exchange pipe, and improving the heat exchange efficiency of the heat exchange pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a liquid distribution control device, a heat exchanger and an air conditioning equipment. BACKGROUND

[0002] The falling film evaporator is widely used due to its high heat transfer coefficient per unit heat exchange area and small amount of refrigerant to be added in the same cold system. The evaporation principle of the falling film evaporator is that the liquid refrigerant outside the heat exchange tube wraps the heat exchange tube in the form of liquid film, and the refrigerant flowing through the wall of the heat exchange tube in the form of film absorbs the heat of the heat exchange tube to evaporate, so as to change from liquid state to vapor state. The heat exchange efficiency of the falling film evaporator depends on the uniformity of the film flow of the refrigerant on the heat exchange tube, and the uniformity of the film flow of the refrigerant depends on the structure of the liquid distributor of the falling film evaporator. It can be seen that the liquid distributor is a key component of the falling film evaporator, and the quality of the liquid distributor determines the heat exchange efficiency of the falling film evaporator.

[0003] Generally, the structure of the falling film evaporator is divided into vertical and horizontal types. In the vertical falling film evaporator, the commonly used liquid distributor structures include the conventional weir structure as shown in Figure 1 , the weir structure with a notch as shown in Figure 2 and Figure 3 . The common feature of the two structures is that the end of the heat exchange tube extends out of the end face of the upper tube plate by a certain height, and the refrigerant flows into the heat exchange tube from the end of the heat exchange tube after forming a certain liquid level outside the heat exchange tube, and the refrigerant forms a liquid film on the inner wall of the heat exchange tube. However, the commonly used liquid distributor structure of the vertical falling film evaporator has the following technical problems:

[0004] The refrigerant outside the heat exchange tube is impacted by the inlet fluid and affected by the liquid level fluctuation, the liquid refrigerant overflowing from the end of the heat exchange tube into the heat exchange tube is not uniformly distributed on the circumferential inner wall of the heat exchange tube, the liquid film formed on the circumferential inner wall of the heat exchange tube at the same height has a large difference in thickness, and the area with a large liquid film thickness has a lower heat exchange efficiency; further, when a large flow of liquid refrigerant overflows from the end of the heat exchange tube into the heat exchange tube, the liquid film formed on the circumferential inner wall has an excessively thick thickness, and the excessively thick liquid film reduces the heat exchange efficiency of the falling film evaporator; further, when the liquid level height of the liquid refrigerant is too high, the large flow of liquid refrigerant directly forms a full flow state in the heat exchange tube, so that the refrigerant in the heat exchange tube cannot form a film flow, and the heat exchange efficiency of the falling film evaporator is further reduced.

[0005] Therefore, in order to improve the heat exchange efficiency of the falling film evaporator, it is urgent to improve the structure of the falling film evaporator in the prior art. SUMMARY

[0006] One of the purposes of the present application is to provide a liquid distribution control device, which solves the technical problem that the liquid distribution is uneven on the circumferential inner wall of the heat exchange tube due to the impact of the inlet fluid and the fluctuation of the liquid level on the refrigerant outside the heat exchange tube, thereby affecting the heat exchange efficiency of the falling film evaporator. The technical effects of the preferred technical solution of the present application are described in detail below.

[0007] To achieve the above-mentioned purposes, the present application provides the following technical solutions.

[0008] The liquid distribution control device of the present application comprises a control ring, which is arranged outside the heat exchange tube of the heat exchanger and fixed on the first tube plate, the heat exchange tube extends from the first tube plate, and a liquid storage space is formed between the control ring, the heat exchange tube and the first tube plate, and an opening is further arranged on the control ring, the refrigerant in the tube box of the heat exchanger enters the liquid storage space through the opening, and the refrigerant in the liquid storage space enters the heat exchange tube.

[0009] According to a preferred embodiment, the liquid distribution control device further comprises a floating ball, the diameter of the floating ball is greater than the outer diameter of the heat exchange tube, the floating ball is located in the control ring and placed at the end of the heat exchange tube, the floating ball moves under the action of buoyancy and forms a gap between the floating ball and the end of the heat exchange tube, and the refrigerant in the liquid storage space enters the heat exchange tube through the gap.

[0010] According to a preferred embodiment, the liquid distribution control device further comprises a cap, the cap moves under the pushing force of the floating ball, and the cap comprises a top wall and a side wall, wherein the top wall covers the top of the control ring, and the top wall is in contact with the floating ball; the side wall is in close contact with the control ring, and the side wall at least partially covers the opening.

[0011] According to a preferred embodiment, the liquid distribution control device further comprises a limiting plate, the limiting plate is arranged above the cap, and the limiting plate is used to limit the upward displacement of the floating ball and the cap.

[0012] According to a preferred embodiment, the maximum distance between the limiting plate and the cap satisfies: h3≥h1+h2, wherein h1 is the distance between the lower end surface of the opening and the first tube plate, h2 is the axial height of the opening, and h3 is the maximum distance between the limiting plate and the cap.

[0013] According to a preferred embodiment, the axis of the control ring coincides with the axis of the heat exchange tube.

[0014] According to a preferred embodiment, the number of openings is multiple, and the openings are uniformly distributed along the circumferential direction of the control ring.

[0015] According to a preferred embodiment, the opening is arranged at a position satisfying h1<=h4, wherein h1 is the distance between the lower end surface of the opening and the first tube plate, and h4 is the distance between the upper end surface of the heat exchange tube and the first tube plate.

[0016] The liquid distribution control device provided by the application has at least the following beneficial technical effects:

[0017] The liquid distribution control device of the application comprises a control ring arranged outside the heat exchange tube of the heat exchanger and fixed to the first tube plate, the heat exchange tube extends out of the first tube plate, and a liquid storage space is formed between the control ring, the heat exchange tube and the first tube plate, and the control ring is further provided with an opening, the refrigerant in the tube box of the heat exchanger enters the liquid storage space through the opening, and the refrigerant in the liquid storage space enters the heat exchange tube.

[0018] That is, the liquid distribution control device of the application solves the technical problem that the refrigerant outside the heat exchange tube is affected by the impact of the inlet fluid and the fluctuation of the liquid level, resulting in uneven distribution of the liquid refrigerant on the circumferential inner wall of the heat exchange tube, which affects the heat exchange efficiency of the falling film evaporator.

[0019] The second object of the application is to provide a heat exchanger.

[0020] The heat exchanger of the application comprises a heat exchanger body and a liquid distribution control device, wherein the liquid distribution control device is the liquid distribution control device described in any one of the technical solutions of the application, the number of the liquid distribution control devices is equivalent to the number of the heat exchange tubes in the heat exchanger body, and the liquid distribution control devices are arranged at the end portions of the heat exchange tubes.

[0021] The heat exchanger provided by the application has at least the following beneficial technical effects:

[0022] The heat exchanger of the application is provided with the liquid distribution control device of any one of the technical solutions of the application at the end portion of the heat exchange tube, and the liquid distribution control device can enhance the uniformity of the liquid film thickness on the inner wall of the heat exchange tube and improve the heat exchange efficiency of the heat exchange tube, so that the heat exchange efficiency of the heat exchanger is improved.

[0023] The third object of the application is to provide an air conditioning equipment.

[0024] The air conditioning equipment of the application comprises the heat exchanger described in any one of the technical solutions of the application.

[0025] The air conditioning equipment provided by the application has at least the following beneficial technical effects:

[0026] The air conditioning equipment of the application, including the heat exchanger of any one of the technical solutions of the application, can improve the performance of the air conditioning equipment due to the improved heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 is a schematic diagram of a preferred embodiment of the liquid distributor in the prior art;

[0029] Figure 2 is a schematic diagram of another preferred embodiment of the liquid distributor in the prior art;

[0030] Figure 3 is Figure 2 A-A sectional view of

[0031] Figure 4 is a schematic diagram of a preferred embodiment of the heat exchanger of the application;

[0032] Figure 5 is a schematic diagram of a preferred embodiment of the circular ring of the application.

[0033] In the figure: 11, control ring; 111, opening; 12, floating ball; 13, cap; 131, top wall; 132, side wall; 14, limiting plate; 21, heat exchange pipe; 22, first pipe plate; 23, pipe box; 24, second pipe plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the application more clear, the technical solutions of the application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the application.

[0035] The technical solutions of the application will be described in detail below in combination with the drawings in the specification Figure 4 and 5 and the liquid distribution control device, heat exchanger and air conditioning equipment of the application.

[0036] Embodiment 1

[0037] The liquid distribution control device of the present application is described in detail in this embodiment.

[0038] The liquid distribution control device of this embodiment comprises a control ring 11, which is arranged outside the heat exchange tube 21 of a heat exchanger and fixed on the first tube plate 22. The heat exchange tube 21 extends out of the first tube plate 22. A liquid storage space is formed between the control ring 11, the heat exchange tube 21 and the first tube plate 22. An opening 111 is arranged on the control ring 11. The refrigerant in the tube box 23 of the heat exchanger enters the liquid storage space through the opening 111. The refrigerant in the liquid storage space enters the heat exchange tube 21, as shown in Figure 4 and Figure 5 The control ring 11 is preferably in a cylindrical structure matching the heat exchange tube 21. More preferably, the shape of the opening 111 is not limited, for example, rectangular, square or circular, etc. Figure 4 and Figure 5 A schematic view showing that the opening 111 is rectangular is shown.

[0039] The liquid distribution control device of this embodiment comprises a control ring 11, which is arranged outside the heat exchange tube 21 of a heat exchanger and fixed on the first tube plate 22. The heat exchange tube 21 extends out of the first tube plate 22. A liquid storage space is formed between the control ring 11, the heat exchange tube 21 and the first tube plate 22. An opening 111 is arranged on the control ring 11. The refrigerant in the tube box 23 of the heat exchanger enters the liquid storage space through the opening 111. The refrigerant in the liquid storage space enters the heat exchange tube 21 from the end of the heat exchange tube 21. It can be seen that, by the isolation effect of the control ring 11, the liquid level in the liquid storage space is stable, the influence of the liquid level fluctuation of the refrigerant outside the control ring 11 on the liquid level in the liquid storage space is reduced, and the influence of the impact of the inlet fluid on the refrigerant in the liquid storage space is also avoided. Therefore, the liquid refrigerant in the liquid storage space can flow into the inner wall of the heat exchange tube 21 uniformly from the end of the heat exchange tube 21. Compared with the liquid distributor in the prior art, the liquid distribution control device of this embodiment can enhance the uniformity of the liquid film thickness on the inner wall of the heat exchange tube 21, thereby improving the heat exchange efficiency of the heat exchange tube 21. That is, the liquid distribution control device of this embodiment solves the problem in the prior art that the refrigerant outside the heat exchange tube 21 is affected by the impact of the inlet fluid and the liquid level fluctuation, resulting in uneven distribution of the liquid refrigerant on the circumferential inner wall of the heat exchange tube 21, which affects the heat exchange efficiency of the falling film evaporator.

[0040] According to a preferred embodiment, the liquid distribution control device further comprises a floating ball 12, the diameter of the floating ball 12 is greater than the outer diameter of the heat exchange tube 21, the floating ball 12 is located in the control ring 11 and placed at the end of the heat exchange tube 21. The floating ball 12 moves under the action of buoyancy and forms a gap between the floating ball 12 and the end of the heat exchange tube 21. The refrigerant in the liquid storage space enters the heat exchange tube 21 through the gap, as shown in Figure 4The floating ball 12 is preferably spherical. The inner diameter of the control ring 11 is preferably slightly larger than the diameter of the floating ball 12, so that the floating ball 12 can be installed in the control ring 11 and can move up and down freely in the control ring 11 under the action of the buoyancy. Specifically, when the liquid level of the liquid refrigerant in the pipe box 23 exceeds the lowest part of the opening 111, the liquid refrigerant flows into the storage space from the opening 111. As the refrigerant continues to flow in, the liquid level in the storage space gradually rises, and the floating ball 12 rises under the action of the buoyancy, so that a gap is formed between the floating ball 12 and the end of the heat exchange pipe 21, and the refrigerant in the storage space flows uniformly into the inner wall of the heat exchange pipe 21 along the gap. The refrigerant on the inner wall of the heat exchange pipe 21 flows downward along the inner wall under the action of gravity, forming a liquid film on the inner wall of the heat exchange pipe 21, which absorbs heat from the heat exchange pipe 21 and changes from liquid to vapor, realizing falling film evaporation. The liquid distribution control device of the preferred technical solution of the present embodiment further comprises a floating ball 12, which moves upward under the action of the buoyancy of the refrigerant in the storage space and forms a gap between the floating ball 12 and the end of the heat exchange pipe 21, and the refrigerant in the storage space flows uniformly into the inner wall of the heat exchange pipe 21 along the gap. Therefore, the flow area of the refrigerant entering the heat exchange pipe 21 can be controlled, the problem of limiting the flow of the liquid refrigerant entering the heat exchange pipe 21 is solved, the liquid film with a controllable thickness is formed on the circumferential inner wall of the heat exchange pipe 21, and the full flow state in the heat exchange pipe 21 is avoided, which can further improve the heat exchange efficiency of the heat exchange pipe 21.

[0041] According to a preferred embodiment, the liquid distribution control device further comprises a cap 13, which moves under the pushing force of the floating ball 12, as shown in Figure 4 Preferably, the cap 13 comprises a top wall 131 and a side wall 132, wherein the top wall 131 covers the top of the control ring 11 and is in contact with the floating ball 12, and the side wall 132 is in contact with the control ring 11 and at least partially covers the opening 111, as shown in Figure 4 According to the preferred technical solution of the present embodiment, the side wall 132 at least partially covers the opening 111 when there is no gap between the floating ball 12 and the end of the heat exchange pipe 21, as shown in Figure 4As shown in the figure, when the floating ball 12 moves upward, the cap 13 also moves upward with the floating ball 12, and the flow area of the opening 111 increases, and the amount of refrigerant flowing from the tube box 23 into the liquid storage space increases; when the floating ball 12 moves downward, the cap 13 also moves downward with the floating ball 12, and the flow area of the opening 111 decreases, and the amount of refrigerant flowing from the tube box 23 into the liquid storage space decreases. The liquid distribution control device of the preferred technical solution of the embodiment further comprises the cap 13, the cap 13 moves upward or downward with the movement of the floating ball 12, and the flow area of the opening 111 can be controlled through the cap 13, so as to control the amount of refrigerant flowing from the tube box 23 into the liquid storage space, further solve the problem of limiting the flow of liquid refrigerant flowing into the heat exchange tube 21, ensure that the circumferential inner wall of the heat exchange tube 21 forms a controllable thickness of the liquid film, and also avoid the full flow state in the heat exchange tube 21, which can further improve the heat exchange efficiency of the heat exchange tube 21.

[0042] According to a preferred embodiment, the liquid distribution control device further comprises a limiting plate 14, the limiting plate 14 is arranged above the cap 13, and the limiting plate 14 is used to limit the displacement of the floating ball 12 and the cap 13 moving upward, as shown in the figure. Figure 4 Specifically, the floating ball 12 is lifted to a certain height under the action of the refrigerant buoyancy in the liquid storage space, and the cap 13 is also lifted to a certain height, until the cap 13 is in contact with the limiting plate 14 and is limited to continue to rise, and the refrigerant uniformly flows into the heat exchange tube 21 from the gap between the floating ball 12 and the end of the heat exchange tube 21, and forms a liquid film on the inner wall of the heat exchange tube 21 under the action of gravity to absorb heat and evaporate. Specifically, the liquid distribution control device of the preferred technical solution of the embodiment further comprises the limiting plate 14, which limits the displacement of the cap 13 moving upward, so as to control the lifting height of the floating ball 12 and the cap 13, not only the flow area of the opening 111 can be controlled, but also the flow gap between the floating ball 12 and the end of the heat exchange tube 21 can be controlled; by controlling the flow gap between the floating ball 12 and the end of the heat exchange tube 21, the flow area of the refrigerant flowing from the liquid storage space to the heat exchange tube 21 is effectively controlled, further solving the problem of limiting the flow of liquid refrigerant flowing into the heat exchange tube 21, ensuring that the circumferential inner wall of the heat exchange tube 21 forms a controllable thickness of the liquid film, and also avoiding the full flow state in the heat exchange tube 21, which can further improve the heat exchange efficiency of the heat exchange tube 21.

[0043] According to a preferred embodiment, the maximum distance between the limiting plate 14 and the cap 13 satisfies: h3≥h1+h2, wherein h1 is the distance between the lower end surface of the opening 111 and the first tube plate 22, h3 is the maximum distance between the limiting plate 14 and the cap 13, and h2 is the axial height of the opening 111. Figure 4The positions of h1, h2, and h3 are marked. In this preferred embodiment, the maximum distance between the limiting plate 14 and the cap 13 is the distance between the limiting plate 14 and the cap 13 when there is no flow gap between the float 12 and the end of the heat exchange tube 21, such as... Figure 4 As shown. In this preferred embodiment, the liquid distribution control device, when there is no flow gap between the float 12 and the end of the heat exchange tube 21, and the bottom of the side wall 132 of the cap 13 contacts the first tube sheet 22, ensures that the maximum distance between the limiting plate 14 and the cap 13 satisfies: h3 ≥ h1 + h2, thus guaranteeing that the flow cross-sectional area of ​​the opening 111 varies between 0 and the maximum flow cross-sectional area. Not limited to this, when there is no flow gap between the float 12 and the end of the heat exchange tube 21, and the bottom of the side wall 132 of the cap 13 does not contact the first tube sheet 22, the maximum distance between the limiting plate 14 and the cap 13 is less than (h1 + h2), which also guarantees that the flow cross-sectional area of ​​the opening 111 varies between 0 and the maximum flow cross-sectional area. Figure 4 As shown.

[0044] According to a preferred embodiment, the axis of the control ring 11 coincides with the axis of the heat exchange tube 21, such as... Figure 4 As shown. In this preferred embodiment, the axis referred to is the central axis. In the liquid distribution control device of this preferred embodiment, the axis of the control ring 11 coincides with the axis of the heat exchange tube 21, which ensures that the distance from every point on the circumference of the end of the heat exchange tube 21 to the inner wall of the control ring 11 is equal. This ensures that the amount of refrigerant distributed in the liquid storage space outside the end of the heat exchange tube 21 is uniform, which is beneficial for the refrigerant to flow evenly from the end of the heat exchange tube 21 to the inner wall of the heat exchange tube 21, thereby further enhancing the uniformity of the liquid film thickness on the inner wall of the heat exchange tube 21 and thus further improving the heat exchange efficiency of the heat exchange tube 21.

[0045] According to a preferred embodiment, there are multiple openings 111, and the openings 111 are evenly distributed along the circumferential direction of the control ring 11. Figure 4 A schematic diagram showing four openings 111 is provided. However, the number of openings 111 can be five, six, or even more. In this preferred embodiment, the liquid distribution control device has openings 111 evenly distributed along the circumference of the control ring 11. This further ensures a uniform distribution of refrigerant in the liquid storage space outside the end of the heat exchange tube 21, facilitating the uniform flow of refrigerant from the end of the heat exchange tube 21 into the inner wall of the heat exchange tube 21. This further enhances the uniformity of the liquid film thickness on the inner wall of the heat exchange tube 21, thereby further improving the heat exchange efficiency of the heat exchange tube 21.

[0046] According to a preferred embodiment, the location of the opening 111 satisfies: h1≤h4, where h1 is the distance between the lower end face of the opening 111 and the first tube sheet 22, and h4 is the distance between the upper end face of the heat exchange tube 21 and the first tube sheet 22. Figure 4The positions of h1 and h4 are marked. In the preferred embodiment of the liquid distribution control device, the distance between the lower end face of the opening 111 and the first tube sheet 22 is less than or equal to the distance between the upper end face of the heat exchange tube 21 and the first tube sheet 22. This allows the liquid level controlling the rise of the float 12 to originate from the liquid level in the storage space, further reducing the impact of liquid level fluctuations in the tube box 23 on the uniformity of refrigerant distribution on the inner wall of the heat exchange tube 21.

[0047] Example 2

[0048] This embodiment provides a detailed description of the heat exchanger of the present invention.

[0049] The heat exchanger in this embodiment includes a heat exchanger body and a liquid distribution control device. The liquid distribution control device is any liquid distribution control device according to any technical solution in this embodiment, and the number of liquid distribution control devices is approximately equal to the number of heat exchange tubes 21 in the heat exchanger body. The liquid distribution control devices are located at the ends of the heat exchange tubes 21, such as... Figure 4 As shown. Preferably, the heat exchanger in this embodiment is a falling film evaporator, and the structure of the heat exchanger body can be the same as that in the prior art. For example... Figure 4 As shown, the heat exchanger body includes a heat exchange tube 21, which is disposed in a tube box 23. A first tube sheet 22 and a second tube sheet 24 are also disposed in the tube box 23. The heat exchange tube 21 is fixed between the first tube sheet 22 and the second tube sheet 24, and the upper part of the heat exchange tube 21 extends out of the upper surface of the first tube sheet 22.

[0050] In this embodiment, the heat exchanger is provided with a liquid distribution control device of any of the technical solutions in Embodiment 1 at the end of the heat exchange tube 21. Since the liquid distribution control device can enhance the uniformity of the liquid film thickness on the inner wall of the heat exchange tube 21 and improve the heat exchange efficiency of the heat exchange tube 21, the heat exchange efficiency of the heat exchanger is improved.

[0051] Example 3

[0052] This embodiment provides a detailed description of the air conditioning equipment of the present invention.

[0053] The air conditioning equipment in this embodiment includes the heat exchanger of any of the technical solutions in Embodiment 2. Preferably, the air conditioning equipment in this embodiment is a commercial air conditioner, and the remaining structure of the air conditioning equipment can be the same as the prior art, and will not be described again here.

[0054] The air conditioning equipment in this embodiment includes a heat exchanger of any of the technical solutions in embodiment 2. Due to the improved heat exchange efficiency of the heat exchanger, the performance of the air conditioning equipment can be improved.

[0055] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A liquid distribution control device, characterized in that, The system includes a control ring (11), which is located outside the heat exchange tube (21) of the heat exchanger and fixed to the first tube sheet (22). The heat exchange tube (21) extends out of the first tube sheet (22), and a liquid storage space is formed between the control ring (11), the heat exchange tube (21), and the first tube sheet (22). The control ring (11) also has an opening (111), through which the refrigerant in the tube box (23) of the heat exchanger enters the liquid storage space, and the refrigerant in the liquid storage space enters the heat exchange tube (21). It also includes a float (12), the diameter of which is larger than the outer diameter of the heat exchange tube (21). The float (12) is located inside the control ring (11) and placed at the end of the heat exchange tube (21). The float (12) moves under the action of buoyancy and forms a gap between the float (12) and the end of the heat exchange tube (21). The refrigerant in the liquid storage space enters the heat exchange tube (21) through the gap.

2. The liquid distribution control device according to claim 1, characterized in that, It also includes a cap (13) that moves under the thrust of the float (12), and the cap (13) includes a top wall (131) and a side wall (132), wherein the top wall (131) covers the top of the control ring (11) and contacts the float (12); the side wall (132) is attached to the control ring (11) and at least partially covers the opening (111).

3. The liquid distribution control device according to claim 2, characterized in that, It also includes a limiting plate (14), which is disposed above the cap (13) and is used to limit the upward displacement of the float (12) and the cap (13).

4. The liquid distribution control device according to claim 3, characterized in that, The maximum distance between the limiting plate (14) and the cap (13) satisfies: h3≥h1+h2, where h1 is the distance between the lower end face of the opening (111) and the first tube plate (22), h2 is the axial height of the opening (111), and h3 is the maximum distance between the limiting plate (14) and the cap (13).

5. The liquid distribution control device according to any one of claims 1 to 4, characterized in that, The axis of the control ring (11) coincides with the axis of the heat exchange tube (21).

6. The liquid distribution control device according to any one of claims 1 to 4, characterized in that, The number of openings (111) is multiple, and the openings (111) are evenly distributed along the circumferential direction of the control ring (11).

7. The liquid distribution control device according to claim 6, characterized in that, The location of the opening (111) satisfies: h1≤h4, where h1 is the distance between the lower end face of the opening (111) and the first tube sheet (22), and h4 is the distance between the upper end face of the heat exchange tube (21) and the first tube sheet (22).

8. A heat exchanger, characterized in that, It includes a heat exchanger body and a liquid distribution control device, wherein the liquid distribution control device is the liquid distribution control device according to any one of claims 1 to 7, and the number of liquid distribution control devices is equivalent to the number of heat exchange tubes (21) in the heat exchanger body, and the liquid distribution control device is disposed at the end of the heat exchange tubes (21).

9. An air conditioning device, characterized in that, Includes the heat exchanger as described in claim 8.

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