Evaporative condensing heat exchanger with variable flow rate of liquid discharge

Abstract

The present application relates to the technical field of heat exchanger, and more particularly to a liquid discharge variable flow speed evaporation condensation type heat exchanger, which comprises a heat exchanger body, fixed frames arranged on both sides of the heat exchanger body, and a heat exchange pipe group arranged in the fixed frames; the heat exchange pipe group comprises a distribution cavity and a liquid collecting cavity arranged at the end of the fixed frame, an inlet pipe arranged in the distribution cavity, a conversion cavity arranged at the side of the distribution cavity, and a liquid discharge port arranged between the conversion cavity and the liquid collecting cavity. The liquid discharge variable flow speed evaporation condensation type heat exchanger can separate gas and liquid when the refrigerant in a gas-liquid mixed state passes through the pipe group and enters the distribution cavity, the liquid enters the liquid collecting cavity from the liquid discharge port, the dryness of the refrigerant in the subsequent pipe group is improved, the heat transfer coefficient is improved, the area is reduced, and the size of the unit is reduced while the performance remains unchanged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to an evaporative condensing heat exchanger with variable flow rate of liquid discharge. BACKGROUND

[0002] The evaporative condenser is a device widely used in refrigeration systems, cold storage cooling and other places requiring large heat exchange. It uses the process of water evaporation on the surface of the cooling coil to absorb heat and condense the medium in the pipe to achieve rapid cooling effect. The gaseous refrigerant and liquid refrigerant in the existing condensing coil are mixed, which affects the heat transfer efficiency and stability. Therefore, the present application provides an evaporative condensing heat exchanger with variable flow rate of liquid discharge. SUMMARY

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

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

[0005] To solve the above technical problems, the present application provides the following technical scheme: 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 pipe group arranged in the fixed frame.

[0006] The heat exchange pipe group comprises a distribution cavity and a liquid collecting cavity arranged at the end of the fixed frame, an inlet pipe arranged in the distribution cavity, an outlet pipe arranged in the distribution cavity, a conversion cavity arranged at the side of the distribution cavity, a liquid discharge port arranged between the conversion cavity and the liquid collecting cavity, and a pipe group arranged between the distribution cavity, the conversion cavity and the liquid collecting cavity.

[0007] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, wherein: the conversion cavity comprises cavity one and cavity two arranged at the end of the fixed frame.

[0008] The liquid discharge port is located between the cavity two and the liquid collecting cavity.

[0009] The pipe group is located between the distribution cavity, the cavity one, the cavity two and the liquid collecting cavity.

[0010] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, wherein: the pipe group comprises a plurality of cooling section pipes arranged between the distribution cavity and the cavity one, a plurality of condensing section pipes arranged between the cavity one and the cavity two, and a plurality of supercooling section pipes arranged between the cavity two and the distribution cavity.

[0011] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the cooling section pipe is arranged in a U shape, the condensing section pipe is arranged in an S shape, and the supercooling section pipe is arranged in a U shape.

[0012] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the diameter of the cooling section pipe is 6-12 mm, the diameter of the condensing section pipe is 12-25 mm, and the diameter of the supercooling section pipe is 6-12 mm.

[0013] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the liquid collecting cavity is arranged in an L shape, the conversion cavity is arranged above the liquid collecting cavity, the liquid discharge port is arranged at the bottom of the conversion cavity and communicates with the liquid collecting cavity.

[0014] The heat exchange pipe group further comprises an isolation part arranged at the liquid discharge port.

[0015] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the isolation part comprises a liquid accumulation cylinder arranged at the liquid discharge port, a leakage hole arranged at the bottom of the liquid accumulation cylinder, a floating plate elastically arranged above the liquid accumulation cylinder, and an enclosing frame arranged at the bottom of the floating plate.

[0016] The enclosing frame cooperates with the leakage hole.

[0017] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the bottom of the heat exchanger body is provided with a base, and a heat exchange unit is arranged between the base and the heat exchanger body.

[0018] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the heat exchange unit comprises a water tank arranged between the base and the heat exchanger body, a water pump arranged on the base and connected with the water tank, a spraying water tray arranged above the heat exchange pipe group, and a connecting water pipe arranged between the spraying water tray and the water pump.

[0019] As a preferred scheme of the evaporative condensing heat exchanger with variable flow rate of liquid discharge, the heat exchange unit further comprises a fan arranged at the top of the heat exchanger body.

[0020] The present application has the following advantages: through the arrangement of the distribution cavity and the liquid collecting cavity in the heat exchange pipe group, when the refrigerant in a gas-liquid mixed state passes through the pipe group and enters the distribution cavity, the separation of gas and liquid can be realized, the liquid enters the liquid collecting cavity through the liquid discharge port, the dryness of the refrigerant in the subsequent pipe group is improved, the heat transfer coefficient is improved, the size of the unit is reduced while the performance is unchanged. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0022] Figure 1 The whole structure schematic diagram of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present application.

[0023] Figure 2 The heat exchange tube group structure schematic diagram of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present application.

[0024] Figure 3 The pipeline group structure schematic diagram of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present application.

[0025] Figure 4 The liquid collecting cavity structure schematic diagram of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present application.

[0026] Figure 5 The isolation part structure schematic diagram of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present application.

[0027] Figure 6 The heat exchange unit structure schematic diagram of the evaporative condensing heat exchanger with variable flow rate of liquid discharge of the present application. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0029] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0030] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. In this specification, "in one embodiment" appearing in different places does not mean the same embodiment, nor is it an independent or selective embodiment mutually exclusive with other embodiments.

[0031] Thirdly, the present application is described in detail in combination with the schematic diagram, in the detailed description of the embodiments of the present application, for the convenience of description, the cross-sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0032] Embodiment 1, refer to Figure 1 and Figure 2 For the first embodiment of the present application, a liquid discharge variable flow rate evaporative condensation type heat exchanger is provided, which comprises a heat exchanger body 100, a fixed frame 200 arranged on both sides of the heat exchanger body 100, and a heat exchange pipe group 300 arranged in the fixed frame 200; wherein the fixed frame 200 is closed at both ends and the middle part is made of a hollow metal frame.

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

[0034] In use, refrigerant is introduced from the inlet pipe 303, the refrigerant enters the distribution cavity 301, then enters the pipe group 307, flows in the pipe group 307, and successively passes through the conversion cavity 305 and the liquid collecting cavity 302, wherein the refrigerant releases heat and condenses during the flow, and when passing through the conversion cavity 305, the condensed liquid enters the liquid collecting cavity 302 from the liquid discharge port 306 to separate the liquid and the gas, thereby improving the dryness of the refrigerant in the subsequent pipe group 307, improving the heat transfer coefficient, reducing the area and the size of the unit while ensuring the performance, and finally the condensed refrigerant is collected in the liquid collecting cavity 302 and discharged from the outlet pipe 304.

[0035] Embodiment 2, refer to Figure 3 For the second embodiment of the present application, the difference between this embodiment and the first embodiment is that the conversion cavity 305 comprises a cavity one 305a and a cavity two 305b arranged at the end of the fixed frame 200.

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

[0037] Further, the pipe group 307 includes a plurality of cooling section pipes 307a arranged between the distribution cavity 301 and the cavity one 305a, a plurality of condensing section pipes 307b arranged between the cavity one 305a and the cavity two 305b, and a plurality of supercooling section pipes 307c arranged between the cavity two 305b and the distribution cavity 301.

[0038] The cooling section pipe 307a is in a U shape, the condensing section pipe 307b is in an S shape, and the supercooling section pipe 307c is in a U shape, and the cooling section pipe 307a, the condensing section pipe 307b, and the supercooling section pipe 307c are arranged in the fixed frame 200 and fill the entire fixed frame 200, thereby increasing the effective flow length of the pipe group 307.

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

[0040] Further, the pipe diameter of the cooling section pipe 307a is 6-12 mm, the pipe diameter of the condensing section pipe 307b is 12-25 mm, and the pipe diameter of the supercooling section pipe 307c is 6-12 mm.

[0041] The cooling section pipe 307a is close to the heat exchanger body 100, and the heat exchange amount accounts for a large proportion. At this time, the refrigerant enters the distribution cavity 301 from the inlet pipe 303. Due to the small pipe diameter of the cooling section pipe 307a, the flow rate of the refrigerant is increased, the heat transfer efficiency is increased, the area is reduced, and the size of the unit is reduced. Then, the cooled refrigerant enters the cavity one 305a and then enters the condensing section pipe 307b with a large pipe diameter to exchange heat and condense to obtain refrigerant in a gas-liquid mixed state. Then, the refrigerant enters the cavity two 305b. The liquid enters the liquid collection cavity 302 from the liquid discharge port 306, and the gas refrigerant is left. The dryness of the refrigerant is increased. The refrigerant in this state enters the supercooling section pipe 307c with a small diameter and flows at a high speed to condense and supercool with air. Finally, the refrigerant enters the liquid collection cavity 302 and flows out from the outlet pipe 304.

[0042] The remaining structure is the same as that of the first embodiment.

[0043] Embodiment 3, with reference to Figure 4 and Figure 5 is a third embodiment of the present application. The difference between this embodiment and the second embodiment is that the liquid collection cavity 302 is in an L shape, the conversion cavity 305 is located above the liquid collection cavity 302, the liquid discharge port 306 is arranged at the bottom of the conversion cavity 305 and communicates with the liquid collection cavity 302.

[0044] The heat exchange pipe group 300 further includes an isolation portion 308 arranged at the liquid discharge port 306.

[0045] Further, the isolation part 308 comprises a liquid accumulation cylinder 308a arranged at the liquid discharge port 306, a leakage hole 308b arranged at the bottom of the liquid accumulation cylinder 308a, a floating plate 308c elastically arranged above the liquid accumulation cylinder 308a, and an enclosure 308d arranged at the bottom of the floating plate 308c; the enclosure 308d is matched with the leakage hole 308b, and the floating plate 308c is connected with the liquid accumulation cylinder 308a through a spring.

[0046] Further, the lowest supercooling section pipe 307c is away from the liquid discharge port 306 by a distance, and the space can be used as a storage cavity of the cavity two 305b, so that the refrigerant in the gas-liquid mixed state can be stored in the cavity two 305b to avoid entering the supercooling section pipe 307c directly.

[0047] In the initial state, the floating plate 308c drives the enclosure 308d to abut against the leakage hole 308b under the elastic force of the spring to close the leakage hole 308b. When the refrigerant in the gas-liquid mixed state enters the cavity two 305b, the liquid falls in the cavity two 305b and is gathered at the bottom of the cavity two 305b and cannot flow into the supercooling section pipe 307c. The liquid flows into the liquid accumulation cylinder 308a, and when the liquid overflows the enclosure, the floating plate 308c is lifted to stretch the spring and drive the enclosure 308d to separate from the leakage hole 308b. The liquid in the liquid accumulation cylinder 308a and the cavity two 305b enters the liquid collection cavity 302 through the leakage hole 308b. At the same time, the liquid refrigerant also isolates the leakage hole 308b from the gas refrigerant when passing through the leakage hole 308b, so that the gas refrigerant cannot pass through the leakage hole 308b to enter the liquid collection cavity 302. When there is no liquid in the cavity two 305b or the liquid cannot lift the floating plate 308c, the enclosure 308d abuts against the leakage hole 308b at all times to avoid the gas refrigerant from passing through the leakage hole 308b to enter the liquid collection cavity 302, so as to ensure that no gas refrigerant is discharged from the liquid collection cavity 302.

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

[0049] Embodiment 4, refer to Figure 6 As the fourth embodiment of the present application, the difference between this embodiment and the third embodiment is that the bottom of the heat exchanger body 100 is provided with a base 101, and the heat exchanger unit 400 is arranged between the base 101 and the heat exchanger body 100.

[0050] The heat exchanger 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 with the water tank 401, a water spraying disc 403 arranged above the heat exchange pipe group 300, and a connecting water pipe 404 arranged between the water spraying disc 403 and the water pump 402.

[0051] The existing system has a liquid storage separation tank to separate gas and liquid, and the gas is recycled to the inlet of the evaporative condensing heat exchanger for heat exchange and condensation, which causes high cost of the system.

[0052] The liquid in the water tank 401 is pumped by the water pump 402 and injected into the spray tray 403 through the connecting water pipe 404, and finally sprayed from the spray tray 403 to fall in the supercooling section pipe 307c, wherein the gas refrigerant in the supercooling section pipe 307c exchanges heat with air and water to achieve a supercooling degree of 4℃ or above, ensuring that the outlet refrigerant is in a pure liquid state, and the existing liquid storage separation tank on the evaporative condensing unit can be cancelled, and the water spraying heat exchange can effectively reduce the size of the unit.

[0053] The heat exchange unit 400 further comprises a fan 405 arranged at the top of the heat exchanger body 100, which can cool the heat exchanger body 100.

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

[0055] Heat exchange efficiency detection of the heat exchanger:

[0056] The heat transfer efficiency in the multiple pipes of the heat exchanger is detected by changing the temperature and content of the refrigerant at the inlet of the inlet pipe 303, and the dryness of the refrigerant at the inlet of the condensing section pipe 307b and the supercooling section pipe 307c and the gas content of the refrigerant at the outlet pipe 304, and the detection results of example 4 are shown in the table below:

[0057] (wherein the refrigerant is selected from the refrigerant used in low-temperature refrigeration units)

[0058]

[0059] The liquid in the refrigerant entering the supercooling section pipe 307c is removed by the setting of the liquid collecting cavity 302 to improve the dryness of the refrigerant and ensure that the gas content of the outlet pipe is 0, and the existing liquid storage separation tank on the evaporative condensing unit is cancelled.

[0060] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting, and although the present application 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 application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A liquid draining variable flow rate evaporative condensing heat exchanger characterized by: The heat exchanger comprises a heat exchanger body (100), fixed frames (200) arranged on both sides of the heat exchanger body (100), and a heat exchange pipe group (300) arranged in the fixed frame (200); The heat exchange pipe group (300) comprises distribution cavities (301) and liquid collecting cavities (302) arranged at the ends of the fixed frame (200), inlet pipes (303) arranged in the distribution cavities (301), outlet pipes (304) arranged in the distribution cavities (301), conversion cavities (305) arranged at the sides of the distribution cavities (301), liquid discharge openings (306) arranged between the conversion cavities (305) and the liquid collecting cavities (302), and pipe groups (307) arranged between the distribution cavities (301), the conversion cavities (305) and the liquid collecting cavities (302); The conversion cavities (305) comprise cavity one (305a) and cavity two (305b) arranged at the ends of the fixed frame (200); The liquid discharge openings (306) are located between the cavity two (305b) and the liquid collecting cavities (302); The pipe groups (307) are located between the distribution cavities (301), the cavity one (305a), the cavity two (305b) and the liquid collecting cavities (302); The pipe groups (307) comprise multiple groups of cooling section pipes (307a) arranged between the distribution cavities (301) and the cavity one (305a), multiple groups of condensation section pipes (307b) arranged between the cavity one (305a) and the cavity two (305b), and multiple groups of supercooling section pipes (307c) arranged between the cavity two (305b) and the distribution cavities (301); The liquid collecting cavities (302) are L-shaped, the conversion cavities (305) are located above the liquid collecting cavities (302), the liquid discharge openings (306) are arranged at the bottoms of the conversion cavities (305) and communicate with the liquid collecting cavities (302); The heat exchange pipe group (300) further comprises isolation portions (308) arranged at the liquid discharge openings (306); The isolation portions (308) comprise liquid accumulation cylinders (308a) arranged at the liquid discharge openings (306), leakage holes (308b) arranged at the bottoms of the liquid accumulation cylinders (308a), floating plates (308c) arranged above the liquid accumulation cylinders (308a) in an elastic manner, and sealing frames (308d) arranged at the bottoms of the floating plates (308c); The sealing frames (308d) are matched with the leakage holes (308b).

2. The evaporative condensing heat exchanger of claim 1, wherein: The cooling section pipes (307a) are U-shaped, the condensation section pipes (307b) are S-shaped, and the supercooling section pipes (307c) are U-shaped.

3. The evaporative condensing heat exchanger of claim 1 or 2, wherein: The pipe diameters of the cooling section pipes (307a) are 6-12 mm, the pipe diameters of the condensation section pipes (307b) are 12-25 mm, and the pipe diameters of the supercooling section pipes (307c) are 6-12 mm.

4. The evaporative condensing heat exchanger of claim 3, wherein: The heat exchanger body (100) is provided with a base (101), and a heat exchange unit (400) is arranged between the base (101) and the heat exchanger body (100).

5. The evaporative condensing heat exchanger of claim 4, wherein: 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 with the water tank (401), a spray water tray (403) arranged above the heat exchange pipe group (300), and a connecting water pipe (404) arranged between the spray water tray (403) and the water pump (402).

6. The evaporative condensing heat exchanger of claim 5, wherein: The heat exchange unit (400) further comprises a fan (405) arranged at the top of the heat exchanger body (100).

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