A spiral tube heat exchanger for cold trap machine

Abstract

A heat exchanger includes a cylinder body, a cavity is formed inside the cylinder body, the cylinder body has a cylinder body inlet and a cylinder body outlet, and a plurality of winding branch pipes are accommodated inside the cavity, each winding branch pipe is formed by winding a tube, the tube winding forms a multi-layer structure, the multi-layer structure forms a frustum-shaped inner cavity, and the plurality of winding branch pipes are stacked together through their respective frustum-shaped inner cavities; a first opening and a second opening are formed at both ends of each winding branch pipe, each first opening is connected to a first main pipeline, and each second opening is connected to a second main pipeline. The winding branch pipe can be a spiral branch pipe, and by stacking a plurality of spiral branch pipes, the heat exchange area can be significantly increased and the heat exchange efficiency can be improved.

Description

Technical Field

[0001] The invention relates to a heat exchanger, in particular to a cold trap spiral tube heat exchanger. Background Art

[0002] At present, the fin drying process of the two devices (condenser and evaporator, also known as indoor heat exchanger and outdoor heat exchanger) in the air-conditioning industry generally involves high-temperature degreasing of the heat exchanger by burning natural gas, which generates a large amount of heat (temperature reaches 160-180°C under normal pressure). The heat exchanger contains a large amount of copper tube oil and fin oil, which will produce a large amount of oil mist (mainly containing C12-C16 saturated alkanes) during the high-temperature drying process. At the same time, the high-temperature degreasing process will also produce a large amount of waste gas (mainly containing triphenyl, styrene, total VOCs, non-methane total hydrocarbons, nitrogen dioxide, nitrogen oxides, carbon monoxide, smoke blackness, particulate matter, etc.). The existing traditional production model of the two devices has problems such as high energy consumption, waste gas pollution, and poor working environment. Summary of the invention

[0003] In view of this, the present invention proposes a heat exchanger that can increase the heat exchange area and improve the heat exchange efficiency. The heat exchanger of the present invention can be used in particular as a spiral tube heat exchanger for a cold trap machine. The heat exchanger of the present invention includes a plurality of heat exchange tubes, which are stacked together. The heat exchange tubes can be coil-type light tube heat exchange tubes, and preferably, they are composed of spiral pipes with gradually increasing winding radius. The heat exchange tubes of this scheme can make full use of the spatial characteristics inside the cylinder body to improve the heat exchange efficiency. The heat exchange by spiral pipes has higher heat transfer performance. The stacking arrangement and staggered arrangement of the pipes have a larger vertically projected heat exchange area. Secondly, the structure without fins between the light tubes can effectively reduce wind resistance and increase the effective circulation of air volume. At the same time, the finless light tube structure is conducive to the collection of condensed oil. Specifically:

[0004] A heat exchanger includes a cylinder body, a cavity is formed inside the cylinder body, the cylinder body has a cylinder inlet and a cylinder outlet, a plurality of winding branch pipes are accommodated inside the cavity, each winding branch pipe is formed by winding a tube, the tube winding forms a multi-layer structure, the multi-layer structure forms a frustum-shaped inner cavity, and the plurality of winding branch pipes are superimposed together through their respective frustum-shaped inner cavities; a first opening and a second opening are respectively formed at both ends of each winding branch pipe, each first opening is connected to a first main pipeline, and each second opening is connected to a second main pipeline.

[0005] Preferably, the winding branch pipe is a spiral branch pipe.

[0006] Preferably, the winding branch pipe has a first straight section, one end of which forms the first opening, and the first straight section is approximately a horizontal straight section; and / or the winding branch pipe has a second straight section, one end of which forms the second opening, and the second straight section is approximately a vertical straight section.

[0007] Preferably, the plurality of winding branch pipes are stacked together by being placed in layers, and when placed in layers, adjacent winding branch pipes are rotated relative to each other by a predetermined angle in sequence.

[0008] The predetermined angle may be set to 360 degrees / the number of winding branch pipes, that is, the winding branch pipes are evenly distributed in the circumferential direction.

[0009] Preferably, the first main pipeline is located in an internal space surrounded by a plurality of winding branch pipes.

[0010] Preferably, the second main pipe is located below the plurality of winding branch pipes and has an annular portion, and the second opening 24 is connected to the annular portion.

[0011] Preferably, the heat exchanger is a cold trap heat exchanger.

[0012] Preferably, the cylinder inlet is located near the bottom of the cylinder, and the cylinder outlet is located near the top of the cylinder.

[0013] Preferably, a guide fixing plate is further provided inside the cylinder body for guiding the gas entering from the cylinder body inlet, and an oil storage cavity is provided at the bottom of the cylinder body.

[0014] Preferably, it further comprises a refrigerant inlet pipe and a refrigerant outlet pipe, wherein the refrigerant inlet pipe is connected to the first main pipe, and the refrigerant outlet pipe is connected to the second main pipe.

[0015] Preferably, the heat exchange tube is a bare tube heat exchange tube, that is, no fins are arranged on it.

[0016] Preferably, the heat exchange tube is made of special copper or stainless steel to avoid corrosion by corrosive oil mist gas. It does not contain ribs or fins, and has low wind resistance. The special winding and combination method can minimize the space between the light tubes, and place them at an angle to increase the heat exchange area and improve the heat exchange efficiency.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail its exemplary embodiments with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present disclosure, and it is clear to a person skilled in the art that other accompanying drawings can be obtained from these accompanying drawings without creative work.

[0019] Figure 1 : A three-dimensional schematic diagram of the heat exchange tube of the present invention.

[0020] Figure 2 : The front view of the heat exchange tube of the present invention.

[0021] Figure 3 : A top view of the heat exchange tube of the present invention.

[0022] Figure 4 : The front view of a single spiral branch pipe of the present invention.

[0023] Figure 5 : A top view of a single spiral branch pipe of the present invention.

[0024] Figure 6 : Schematic diagram of the heat exchanger of the present invention.

[0025] Wherein: 1-heat exchanger, 10-cylinder, 11-cylinder inlet, 12-cylinder outlet, 13-top cover, 14-oil storage chamber, 15-guiding fixing plate, 16-refrigerant inlet pipe, 17-refrigerant outlet pipe;

[0026] 2-heat exchange tube, 20-spiral branch pipe, 21-first main pipe, 22-second main pipe, 23-first opening, 24-second opening. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0028] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0029] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0030] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0031] It should be understood that although the terms first, second, third, etc. may be used herein to describe various structures, these structures should not be limited by these terms. These terms are used to distinguish one structure from another structure. Therefore, the first structure discussed below can be referred to as the second structure without departing from the teachings of the disclosed concepts. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0032] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present disclosure, and therefore cannot be used to limit the protection scope of the present disclosure.

[0033] The following is combined with Figure 1-6 The contents of the specific implementation modes of the present invention are described in detail:

[0034] A heat exchanger 1 includes a cylinder body 10, a cavity is formed inside the cylinder body 10, the cylinder body 10 has a cylinder body inlet 11 and a cylinder body outlet 12, a plurality of winding branch pipes are accommodated inside the cavity, each winding branch pipe is formed by winding a tube, the tube winding forms a multi-layer structure, the multi-layer structure forms a frustum-shaped inner cavity, and the plurality of winding branch pipes are superimposed together through their respective frustum-shaped inner cavities; a first opening 23 and a second opening 24 are formed at both ends of each winding branch pipe, each first opening 23 is connected to a first main line 21, and each second opening 24 is connected to a second main line 22.

[0035] Preferably, the winding branch pipe is a spiral branch pipe 20 .

[0036] Preferably, the winding branch pipe has a first straight section, one end of which forms the first opening 23, and the first straight section is approximately a horizontal straight section; and / or the winding branch pipe has a second straight section, one end of which forms the second opening 24, and the second straight section is approximately a vertical straight section.

[0037] Preferably, the plurality of winding branch pipes are stacked together by being placed in layers, and when placed in layers, adjacent winding branch pipes are rotated relative to each other by a predetermined angle in sequence.

[0038] The predetermined angle may be set to 360 degrees / the number of winding branch pipes, that is, the winding branch pipes are evenly distributed in the circumferential direction.

[0039] Preferably, the first main pipe 21 is located in an internal space surrounded by a plurality of winding branch pipes.

[0040] Preferably, the second main pipe 22 is located below the plurality of winding branch pipes and has an annular portion, and the second opening 24 is connected to the annular portion.

[0041] Preferably, the heat exchanger 1 is a cold trap heat exchanger 1.

[0042] Preferably, the cylinder inlet 11 is located near the bottom of the cylinder 10 , and the cylinder outlet 12 is located near the top of the cylinder 10 .

[0043] Preferably, a guide fixing plate 15 is further provided inside the cylinder body 10 for guiding the gas entering from the cylinder body inlet 11 , and an oil storage chamber 14 is provided at the bottom of the cylinder body 10 .

[0044] The cylinder body 10 can be an integral structure or can be composed of various parts. Figure 6 As shown, the cylinder block 10 includes a body, a cylinder block top cover 13 and an oil storage chamber 14 at the bottom.

[0045] Preferably, the refrigerant inlet pipe 16 and the refrigerant outlet pipe 17 are further included. The refrigerant inlet pipe 16 is connected to the first main pipe 21 , and the refrigerant outlet pipe 17 is connected to the second main pipe 22 .

[0046] Reference below Figure 1-6 The principle and process of the present invention are described as follows:

[0047] like Figure 1-3 As shown, the spiral tube heat exchange tube 2 of the present invention is composed of a plurality of winding branches, preferably spiral branches 20, a first main line 21 and a second main line 22. Figure 4 , as shown in FIG. 5 , the first opening 23 and the second opening 24 at both ends of the spiral branch pipe 20 are respectively connected to the first main channel 21 and the second main channel 22 of the heat exchange tube 2, preferably by welding. To achieve the best effect, the number of layers of the spiral branch pipe 20 should be as large as possible, the gaps between different layers should be as small as possible, the adjacent spiral branch pipes 20 should be rotated at a certain angle, and the number of spiral coils should be adjusted according to the outer diameter allowed by the heat exchange tube 2 to achieve Figure 3 The effect of the top view, that is, looking down at the heat exchange tube 2, there are spiral branch pipes 20 arranged in a circular range without any blank area.

[0048] like Figure 6As shown, the heat exchange tube 2 of the present invention is installed in the closed cylinder 10 (the collection chamber of the oil mist collector) to form a heat exchanger 1, which is connected to the refrigeration system and adopts the low-temperature condensation principle as the core component for purifying oil mist exhaust gas. Under the action of the purification system pipe network and the exhaust fan, the air containing oil mist enters the cylinder 10 from the cylinder inlet 11, i.e., the air inlet, and after being guided into a uniform and dense airflow by the guide fixing plate 15, it rises and passes through the heat exchange tube 2 for condensation, wherein the harmful components are condensed into liquid and drip into the oil storage chamber 14 at the bottom of the cylinder 10 under the action of gravity, and the purified gas is discharged through the cylinder outlet 12, i.e., the air outlet, at the top of the cylinder 10 through the system pipe network.

[0049] like Figure 6 As shown, before installing the heat exchange tube 2, the oil storage chamber 14 and the guide fixing plate 15 are fixed at a given position, and the guide fixing plate 15 is reserved with a fixing hole and a limit structure for fixing the heat exchange tube 2. During installation, the heat exchange tube 2 is vertically inserted from the top of the condensing chamber cylinder 10, and the angle of the heat exchange tube 2 is adjusted so that it is connected and fixed with the fixed structure reserved by the guide fixing plate 15.

[0050] After installing the heat exchange tube 2, pass the refrigerant inlet pipe 16 and the refrigerant outlet pipe 17 through the reserved holes in the cylinder body 10, and connect them to the first main line 21 and the second main line 22 of the heat exchange tube 2 respectively. The connection here can be welding, pipe joint assembly connection or other connection methods that do not leak refrigerant. Finally, install the top cover 13 of the cylinder body 10 and the oil storage chamber 14 at the bottom. There is no restriction on the material and specifications of the spiral branch pipe 20. Corrosion-resistant copper tubes with good heat exchange performance, thin-walled stainless steel tubes or titanium tubes can be used. There is no restriction on the shape and equation of the spiral branch pipe 20. The equation is referenced as follows (column coordinates), where r represents the base circle radius, theta is the extension angle, t is a variable with a value of 0 to 1, and z represents the height of the spiral: r=60+20*t;

[0051] theta = t*360;

[0052] z = 30*cos(30)*t;

[0053] The winding radius of the spiral branch pipe 20 is not limited to the above-mentioned fixed value, and is mainly determined according to the heat exchange area and the heat exchange capacity of the whole machine. The spiral branch pipe 20 has a first straight section, namely the air inlet section, and a second straight section, namely the air outlet section, which are horizontal and vertical respectively, so as to facilitate the installation and support of the spiral branch pipe 20; each part of the wound spiral branch pipe 20 is the same, and only one mold is needed to complete the winding process. The air outlet section is set at different distances according to the position of the pipeline on this layer. The higher the position, the longer the vertical section. Figure 1 As shown; the spiral branch pipe 20 is nested and assembled, the spiral branch pipe 20 is conical in the upper part and cylindrical in the lower part, which adapts to the spatial characteristics of the external cylinder 10, and is conducive to improving the heat exchange efficiency, such as Figure 1As shown in FIG. 2 , the pipelines are connected by welding. The second straight section of the spiral branch pipe 20 is vertically downward to facilitate the connection with the second main pipeline 22 and the first main pipeline 21. The first main pipeline 21 is a first inlet connected to the top of the vertical pipe. The first main pipeline 21 is welded and connected to the first inlet to form a closed passage. The heat exchanger 1 adopts a reverse heat exchange method. The refrigerant inside the component flows from top to bottom, and the external industrial waste heat flows from bottom to top. Convection heat exchange improves the heat exchange efficiency. To achieve the best effect, each spiral branch pipe 20 should be rotated at a certain angle.

[0054] Optionally, the diameter of the spiral branch pipe 20 in the present invention can be changed to change the heat exchange effect.

[0055] Optionally, the first main channel 21 and the second main channel 22, which may also be referred to as liquid distributors, may be designed as a liquid distributor plus a capillary structure to make the flow distribution more uniform.

[0056] Optionally, the spiral branch pipe 20 may be wound with a variable specific radius, and the number of the spiral branch pipes 20 may be changed to change the capacity of the heat exchanger.

[0057] Optionally, the positions of the refrigerant inlet pipe 16 and the refrigerant outlet pipe 17 may be changed, and the specific positions are set according to the needs of those skilled in the art.

[0058] Beneficial effects:

[0059] The heat exchanger of the present invention can significantly increase the heat exchange area and improve the heat exchange efficiency. The spiral pipe heat exchange has a higher heat transfer performance. The stacking and staggered arrangement of the pipes have a larger vertical projection heat exchange area. Secondly, the structure without fins between the light pipes can effectively reduce wind resistance and increase the effective circulation air volume. The finless light pipe structure is conducive to the collection of condensed oil.

[0060] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A heat exchanger (1), comprising a cylinder (10), wherein a cavity is formed inside the cylinder (10), and the cylinder (10) has a cylinder inlet (11) and a cylinder outlet (12), characterized in that: The cylinder inlet (11) is used for the oil mist exhaust gas to flow in, and the cylinder outlet (12) is used for the purified gas to flow out. The cavity contains a plurality of winding branch pipes, each of which is formed by winding a tube, and the tube winding forms a multi-layer structure, and the multi-layer structure forms a frustum-shaped inner cavity. The plurality of winding branch pipes are stacked together through their respective frustum-shaped inner cavities; a first opening (23) and a second opening (24) are respectively formed at two ends of each winding branch pipe, each of which is connected to the first main line (21), and each of which is connected to the second main line (22); the heat exchanger further comprises a refrigerant inlet pipe (16) and a refrigerant outlet pipe (17), wherein the refrigerant inlet pipe (16) is connected to the first main line (21), and the refrigerant outlet pipe (17) is connected to the second main line (22); the cylinder inlet (11) is located near the bottom of the cylinder (10), and the cylinder outlet (12) is located near the top of the cylinder (10); The refrigerant in the heat exchanger flows from top to bottom to achieve convective heat exchange with the oil mist flowing from bottom to top. The cylinder (10) is also provided with a guide fixing plate (15) located at the bottom of the frustum-shaped inner cavity for guiding the gas entering from the cylinder inlet (11).

2. The heat exchanger (1) according to claim 1, characterized in that: The winding branch pipe is a spiral branch pipe (20).

3. According to the heat exchanger (1) described in any one of claims 1 and 2, the winding branch pipe has a first straight section, one end of which forms the first opening (23), and the first straight section is a horizontal straight section; and / or the winding branch pipe has a second straight section, one end of which forms the second opening (24), and the second straight section is a vertical straight section.

4. The heat exchanger (1) according to any one of claims 1 and 2, characterized in that: The method of stacking a plurality of winding branch pipes is to place them in layers, and when placing them in layers, adjacent winding branch pipes are rotated relative to each other by a predetermined angle in sequence.

5. The heat exchanger (1) according to any one of claims 1 and 2, characterized in that: The first main pipe (21) is located in an internal space surrounded by a plurality of winding branch pipes.

6. The heat exchanger (1) according to any one of claims 1 and 2, characterized in that: The second main pipe (22) is located below the plurality of winding branch pipes and has an annular portion, and the second opening (24) is connected to the annular portion.

7. The heat exchanger (1) according to any one of claims 1 and 2, characterized in that: The heat exchanger (1) is a cold trap heat exchanger (1).

8. The heat exchanger (1) according to any one of claims 1 and 2, characterized in that: An oil storage chamber (14) is provided at the bottom of the cylinder body (10).

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