Evaporation and condensation type heat exchanger capable of changing flow velocity of discharged liquid

Abstract

The invention relates to the technical field of heat exchangers, in particular to a liquid discharge variable flow rate evaporation and condensation type heat exchanger which comprises a heat exchanger body, fixing frames arranged on the two sides of the heat exchanger body and heat exchange tube sets arranged in the fixing frames. The heat exchange tube set comprises a distribution cavity, a liquid collecting cavity, an inlet tube, a conversion cavity and a liquid outlet, wherein the distribution cavity and the liquid collecting cavity are arranged at the end of the fixed frame, the inlet tube is arranged in the distribution cavity, the conversion cavity is arranged on the side edge of the distribution cavity, and the liquid outlet is formed between the conversion cavity and the liquid collecting cavity. According to the evaporation and condensation type heat exchanger with the liquid drainage variable flow speed, through the arrangement of the distribution cavity and the liquid collection cavity in the heat exchange pipe set, when a refrigerant in a gas-liquid mixed state penetrates through the pipeline set to enter the distribution cavity, gas and liquid separation can be achieved, the liquid enters the liquid collection cavity from the liquid drainage opening, the dryness of the refrigerant in the subsequent pipeline set is improved, and the heat exchange efficiency is improved. The heat transfer coefficient is improved, and the area and the unit size are reduced while the performance is not changed.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to an evaporative condensing heat exchanger with variable discharge flow rate. Background Art

[0002] Evaporative condenser is a kind of equipment widely used in refrigeration system, cold storage cooling and other places that require a large amount of heat exchange. It uses the process of water evaporating on the surface of the cooling coil, absorbing heat and condensing the medium in the tube to achieve the effect of rapid cooling. The gaseous refrigerant and liquid refrigerant in the existing condensing coil are mixed, which will affect the heat transfer efficiency and stability. For this reason, the present invention provides an evaporative condensing heat exchanger with variable discharge flow rate. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing evaporative condensing heat exchanger with variable flow rate of liquid discharge, the present invention is proposed.

[0004] Therefore, an object of the present invention is to provide an evaporative condensing heat exchanger with variable discharge flow rate, the purpose of which is to avoid the presence of gas at the outlet.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an evaporative condensing heat exchanger with variable flow rate of liquid discharge, comprising a heat exchanger body, a fixed frame arranged on both sides of the heat exchanger body, and a heat exchange tube group arranged in the fixed frame;

[0006] The heat exchange tube group includes a distribution chamber and a liquid collecting chamber arranged at the end of the fixed frame, an inlet pipe arranged in the distribution chamber, an outlet pipe arranged in the distribution chamber, a conversion chamber arranged on the side of the distribution chamber, a drain port arranged between the conversion chamber and the liquid collecting chamber, and a pipeline group arranged between the distribution chamber, the conversion chamber and the liquid collecting chamber.

[0007] As a preferred solution of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present invention, wherein: the conversion chamber comprises a chamber 1 and a chamber 2 arranged at the end of the fixed frame;

[0008] The liquid discharge port is located between the second cavity and the liquid collecting cavity;

[0009] The pipeline group is located between the distribution chamber, the first chamber, the second chamber and the liquid collection chamber.

[0010] As a preferred solution of the variable flow rate evaporative condensing heat exchanger with liquid discharge described in the present invention, the pipeline group includes multiple groups of cooling section tubes arranged between the distribution chamber and the cavity one, multiple groups of condensing section tubes arranged between the cavity one and the cavity two, and multiple groups of supercooling section tubes arranged between the cavity two and the distribution chamber.

[0011] As a preferred solution of the variable flow rate evaporative condensing heat exchanger of the present invention, the cooling section tube is set to U shape, the condensing section tube is set to S shape, and the subcooling section tube is set to U shape.

[0012] As a preferred solution of the variable flow rate evaporative condensing heat exchanger of the present invention, the diameter of the cooling section tube is 6-12 mm, the diameter of the condensing section tube is 12-25 mm, and the diameter of the supercooling section tube is 6-12 mm.

[0013] As a preferred solution of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present invention, wherein: the liquid collecting chamber is set to be L-shaped, the conversion chamber is located above the liquid collecting chamber, and the liquid discharge port is arranged at the bottom of the conversion chamber and communicates with the liquid collecting chamber;

[0014] The heat exchange tube group further includes an isolation portion arranged at the drain port.

[0015] As a preferred solution of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present invention, the isolation part includes a liquid accumulation cylinder arranged at the liquid discharge port, a leak hole arranged at the bottom of the liquid accumulation cylinder, a floating plate elastically arranged above the liquid accumulation cylinder, and a sealing frame arranged at the bottom of the floating plate;

[0016] The sealing frame is matched with the leakage hole.

[0017] As a preferred solution of the evaporative condensing heat exchanger with variable flow rate of liquid discharge described in the present invention, a base is provided at the bottom of the heat exchanger body, and a heat exchange unit is provided between the base and the heat exchanger body.

[0018] As a preferred solution of the evaporative condensing heat exchanger with variable flow rate of liquid discharge described in the present invention, the heat exchange unit includes a water tank arranged between the base and the heat exchanger body, a water pump arranged on the base and connected to the water tank, a spray water tray arranged above the heat exchange tube group, and a connecting water pipe arranged between the spray water tray and the water pump.

[0019] As a preferred solution of the variable flow rate evaporative condensing heat exchanger with liquid discharge described in the present invention, the heat exchange unit further includes a fan disposed on the top of the heat exchanger body.

[0020] The beneficial effects of the present invention are as follows: through the arrangement of the distribution chamber and the liquid collecting chamber in the heat exchange tube group, when the refrigerant in a gas-liquid mixed state passes through the tube group and enters the distribution chamber, the gas and the liquid can be separated, and the liquid enters the liquid collecting chamber from the discharge port, thereby increasing the dryness of the refrigerant in the subsequent tube group, increasing the heat transfer coefficient, and ensuring that the performance remains unchanged while reducing the area and the size of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the evaporative condensing heat exchanger with variable flow rate of liquid discharge according to the present invention.

[0023] Figure 2 The figure is a schematic diagram of the heat exchange tube group structure of the evaporative condensing heat exchanger with variable flow rate of liquid discharge according to the present invention.

[0024] Figure 3 The figure is a schematic diagram of the structure of the pipeline group of the evaporative condensing heat exchanger with variable flow rate of liquid discharge according to the present invention.

[0025] Figure 4 The figure is a schematic diagram of the liquid collecting chamber structure of the evaporative condensing heat exchanger with variable flow rate of liquid discharge according to the present invention.

[0026] Figure 5 It is a schematic diagram of the structure of the isolation part of the evaporative condensing heat exchanger with variable flow rate of liquid discharge according to the present invention.

[0027] Figure 6 It is a schematic diagram of the heat exchange unit structure of the evaporative condensing heat exchanger with variable flow rate of liquid discharge according to the present invention. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0032] Example 1, reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides an evaporative condensing heat exchanger with variable flow rate of liquid discharge, the device includes a heat exchanger body 100, a fixed frame 200 arranged on both sides of the heat exchanger body 100, and a heat exchange tube group 300 arranged in the fixed frame 200; wherein, the fixed frame 200 is made of a metal frame with closed ends and a hollow middle portion.

[0033] The heat exchange tube group 300 includes a distribution chamber 301 and a liquid collecting chamber 302 arranged at the end of the fixed frame 200, an inlet pipe 303 arranged in the distribution chamber 301, an outlet pipe 304 arranged in the distribution chamber 301, a conversion chamber 305 arranged on the side of the distribution chamber 301, a drain port 306 arranged between the conversion chamber 305 and the liquid collecting chamber 302, and a pipe group 307 arranged between the distribution chamber 301, the conversion chamber 305 and the liquid collecting chamber 302.

[0034] During use, the refrigerant is introduced from the inlet pipe 303, the refrigerant enters the distribution chamber 301, and then enters the pipe group 307, circulates in the pipe group 307, and passes through the conversion chamber 305 and the liquid collecting chamber 302 in sequence. The refrigerant will release heat and condense during the circulation process. When passing through the conversion chamber 305, the condensed liquid will enter the liquid collecting chamber 302 from the drain port 306 to separate the liquid and gas, thereby increasing the dryness of the refrigerant in the subsequent pipe group 307 and the heat transfer coefficient. While ensuring the performance remains unchanged, the area is reduced and the size of the unit is reduced. Finally, the refrigerant is condensed and collected in the liquid collecting chamber 302 and discharged from the outlet pipe 304.

[0035] Example 2, reference Figure 3 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the conversion cavity 305 includes a cavity 1 305a and a cavity 2 305b disposed at the end of the fixed frame 200;

[0036] The liquid discharge port 306 is located between the second cavity 305 b and the liquid collecting cavity 302 ; the pipeline group 307 is located between the distribution cavity 301 , the first cavity 305 a , the second cavity 305 b and the liquid collecting cavity 302 .

[0037] Furthermore, the pipe group 307 includes multiple groups of cooling section tubes 307a arranged between the distribution chamber 301 and cavity one 305a, multiple groups of condensing section tubes 307b arranged between cavity one 305a and cavity two 305b, and multiple groups of supercooling section tubes 307c arranged between cavity two 305b and the distribution chamber 301.

[0038] Among them, the cooling section tube 307a is set to be U-shaped, the condensing section tube 307b is set to be S-shaped, and the supercooling section tube 307c is set to be U-shaped, and the cooling section tube 307a, the condensing section tube 307b and the supercooling section tube 307c are filled and set in the fixed frame 200, filling the entire fixed frame 200 as a whole, thereby increasing the effective flow length of the pipeline group 307.

[0039] The refrigerant enters the distribution chamber 301 from the inlet pipe 303, and then enters the cooling section pipe 307a, cavity one 305a, condensation section pipe 307b, cavity two 305b, supercooling section pipe 307c and liquid collecting chamber 302 in sequence, and is finally discharged from the outlet pipe 304.

[0040] Furthermore, the diameter of the cooling section tube 307a is 6 to 12 mm, the diameter of the condensing section tube 307b is 12 to 25 mm, and the diameter of the supercooling section tube 307c is 6 to 12 mm.

[0041] Among them, the cooling section tube 307a is close to the heat exchanger body 100, and the heat exchange accounts for a large proportion. At this time, the refrigerant enters the distribution chamber 301 from the inlet pipe 303. Since the diameter of the cooling section tube 307a is small, the flow rate of the refrigerant increases at this time, which can increase the heat transfer efficiency, reduce the area, and reduce the size of the unit. The cooled refrigerant then enters the cavity one 305a, and enters the condensing section tube 307b with a large diameter again for heat exchange and condensation to obtain a refrigerant in a gas-liquid mixed state, and then enters the cavity two 305b, where the liquid enters the liquid collecting chamber 302 from the drain port 306, leaving the gas refrigerant, and the refrigerant dryness increases. The refrigerant in this state enters the small diameter supercooling section tube 307c, and flows at a higher speed, condenses and supercools with the air, and finally enters the liquid collecting chamber 302 and flows out from the outlet pipe 304.

[0042] The remaining structures are the same as those of Example 1.

[0043] Example 3, reference Figure 4 and Figure 5 , which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: the liquid collecting chamber 302 is set to be L-shaped, the conversion chamber 305 is located above the liquid collecting chamber 302, and the drain port 306 is set at the bottom of the conversion chamber 305 and communicates with the liquid collecting chamber 302;

[0044] The heat exchange tube assembly 300 further includes an isolation portion 308 disposed at the drain port 306 .

[0045] Furthermore, the isolation part 308 includes a liquid collection cylinder 308a arranged at the liquid discharge port 306, a leakage hole 308b arranged at the bottom of the liquid collection cylinder 308a, a floating plate 308c elastically arranged above the liquid collection cylinder 308a, and a sealing frame 308d arranged at the bottom of the floating plate 308c; the sealing frame 308d cooperates with the leakage hole 308b, and the floating plate 308c and the liquid collection cylinder 308a are connected by a spring.

[0046] Furthermore, the lowest subcooling section tube 307c is some distance away from the drain port 306, and the space here can be used as the storage chamber of the second cavity 305b, which can allow the refrigerant in a gas-liquid mixed state to enter the second cavity 305b to store the liquid and prevent it from directly entering the subcooling section tube 307c.

[0047] In the initial state, the floating plate 308c drives the sealing frame 308d to resist the leakage hole 308b under the elastic force of the spring, and the leakage hole 308b is sealed. When the refrigerant in the gas-liquid mixed state enters the cavity 305b, the liquid will fall into the cavity 305b and gather at the bottom of the cavity 305b, and will not flow into the supercooling section tube 307c. The liquid will flow into the liquid accumulation cylinder 308a. When the liquid overflows the sealing plate, it will drive the floating plate 308c to float, thereby stretching the spring and driving the sealing frame 308d to separate from the leakage hole 308b, and the liquid accumulation cylinder 308a and The liquid in the second cavity 305b will enter the liquid collecting cavity 302 through the leak hole 308b. At the same time, the liquid refrigerant will also isolate the leak hole 308b and the gas refrigerant when passing through the leak hole 308b, so that the gas refrigerant cannot pass through the leak hole 308b to enter the liquid collecting cavity 302. At the same time, when there is no liquid in the second cavity 305b or the liquid cannot lift the float 308c, the sealing frame 308d and the leak hole 308b are always offset to prevent the gas refrigerant from passing through the leak hole 308b to enter the liquid collecting cavity 302, thereby ensuring that no gas refrigerant is discharged from the liquid collecting cavity 302.

[0048] The remaining structure is the same as that of Example 2.

[0049] Example 4, reference Figure 6 , which is the fourth embodiment of the present invention. This embodiment is different from the third embodiment in that a base 101 is provided at the bottom of the heat exchanger body 100 , and a heat exchange unit 400 is provided between the base 101 and the heat exchanger body 100 .

[0050] The heat exchange unit 400 includes a water tank 401 arranged between the base 101 and the heat exchanger body 100, a water pump 402 arranged on the base 101 and connected to the water tank 401, a spray water tray 403 arranged above the heat exchange tube group 300, and a connecting water pipe 404 arranged between the spray water tray 403 and the water pump 402.

[0051] In the existing system, part of the gaseous refrigerant in the condensing coil is not completely condensed, resulting in gas at the outlet, which affects the efficiency and stability of the system. To compensate for this defect, the system is provided with a liquid storage separation tank to separate the gas and liquid, and the gas is circulated back to the inlet of the evaporative condensing heat exchanger for heat exchange and condensation, which results in high system costs.

[0052] The liquid in the water tank 401 is extracted by the water pump 402 and injected into the spray water pan 403 through the connecting water pipe 404, and finally sprayed out from the spray water pan 403 and sprayed into the subcooling section pipe 307c, wherein the gas refrigerant in the subcooling section pipe 307c performs mass transfer and heat exchange with the air and water to achieve a subcooling degree of more than 4°C, ensuring that the outlet refrigerant is in a pure liquid state, and the liquid storage separation tank on the existing evaporative condensing unit can be eliminated. At the same time, the use of water spraying heat exchange can effectively reduce the size of the unit.

[0053] The heat exchange unit 400 further includes a fan 405 disposed on the top of the heat exchanger body 100 , and the fan 405 can cool the heat exchanger body 100 .

[0054] The remaining structure is the same as that of Example 3.

[0055] Heat exchange efficiency test of heat exchanger:

[0056] By changing the temperature and content of the refrigerant at the inlet of the inlet pipe 303, the heat transfer efficiency in multiple pipes in the heat exchanger, as well as the refrigerant dryness at the inlet of the condensing section pipe 307b and the subcooling section pipe 307c and the refrigerant gas content at the outlet pipe 304 are detected. The detection results in Example 4 are shown in the following table:

[0057] (The refrigerant used is the refrigerant used in low-temperature refrigeration units)

[0058]

[0059] By setting the liquid collecting chamber 302, the liquid in the refrigerant entering the subcooling section pipe 307c is removed, the dryness of the refrigerant is improved, the gas content of the outlet pipe is ensured to be 0, and the liquid storage separation tank on the existing evaporative condensing unit is eliminated.

[0060] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An evaporative condensing heat exchanger with variable discharge flow rate, characterized in that: It comprises a heat exchanger body (100), a fixing frame (200) arranged on both sides of the heat exchanger body (100), and a heat exchange tube group (300) arranged in the fixing frame (200); The heat exchange tube group (300) comprises a distribution chamber (301) and a liquid collecting chamber (302) arranged at the end of the fixed frame (200), an inlet pipe (303) arranged in the distribution chamber (301), an outlet pipe (304) arranged in the distribution chamber (301), a conversion chamber (305) arranged on the side of the distribution chamber (301), a liquid discharge port (306) arranged between the conversion chamber (305) and the liquid collecting chamber (302), and a pipeline group (307) arranged between the distribution chamber (301), the conversion chamber (305) and the liquid collecting chamber (302).

2. The variable flow rate evaporative condensing heat exchanger according to claim 1, characterized in that: The conversion cavity (305) comprises a cavity one (305a) and a cavity two (305b) which are arranged at the ends of the fixed frame (200); The liquid discharge port (306) is located between the second cavity (305b) and the liquid collecting cavity (302); The pipeline group (307) is located between the distribution chamber (301), chamber one (305a), chamber two (305b) and the liquid collection chamber (302).

3. The variable flow rate evaporative condensing heat exchanger according to claim 2 is characterized in that: The pipeline group (307) includes multiple groups of cooling section tubes (307a) arranged between the distribution chamber (301) and the chamber one (305a), multiple groups of condensing section tubes (307b) arranged between the chamber one (305a) and the chamber two (305b), and multiple groups of supercooling section tubes (307c) arranged between the chamber two (305b) and the distribution chamber (301).

4. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 3 is characterized in that: The cooling section tube (307a) is configured to be U-shaped, the condensing section tube (307b) is configured to be S-shaped, and the supercooling section tube (307c) is configured to be U-shaped.

5. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 3 or 4, characterized in that: The diameter of the cooling section tube (307a) is 6 to 12 mm, the diameter of the condensing section tube (307b) is 12 to 25 mm, and the diameter of the supercooling section tube (307c) is 6 to 12 mm.

6. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 5, characterized in that: The liquid collecting chamber (302) is configured to be L-shaped, the conversion chamber (305) is located above the liquid collecting chamber (302), and the liquid discharge port (306) is disposed at the bottom of the conversion chamber (305) and communicates with the liquid collecting chamber (302); The heat exchange tube group (300) further includes an isolation portion (308) disposed at the liquid discharge port (306).

7. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 6, characterized in that: The isolation part (308) comprises a liquid collection cylinder (308a) arranged at the liquid discharge port (306), a leak hole (308b) arranged at the bottom of the liquid collection cylinder (308a), a floating plate (308c) elastically arranged above the liquid collection cylinder (308a), and a sealing frame (308d) arranged at the bottom of the floating plate (308c); The sealing frame (308d) cooperates with the leakage hole (308b).

8. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 7, characterized in that: A base (101) is provided at the bottom of the heat exchanger body (100), and a heat exchange unit (400) is provided between the base (101) and the heat exchanger body (100).

9. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 8, characterized in that: The heat exchange unit (400) comprises a water tank (401) arranged between the base (101) and the heat exchanger body (100), a water pump (402) arranged on the base (101) and connected to the water tank (401), a spray water tray (403) arranged above the heat exchange tube group (300), and a connecting water pipe (404) arranged between the spray water tray (403) and the water pump (402).

10. The evaporative condensing heat exchanger with variable flow rate of discharge according to claim 9, characterized in that: The heat exchange unit (400) further includes a fan (405) disposed on the top of the heat exchanger body (100).

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