Double-helix heat exchanger coil pipe

Abstract

The utility model discloses a double-helix heat exchanger coil pipe, which comprises an inner coil pipe, an outer coil pipe and an inner coil pipe, the outer coil pipe is arranged on the periphery of the inner coil pipe in a surrounding mode, and the top of the outer coil pipe communicates with the upper end of the inner coil pipe through a U-shaped pipe; the thickness and the horizontal height of the inner side end of the inner coil pipe are larger than those of the outer side end of the inner coil pipe, the thickness and the horizontal height of the outer side end of the outer coil pipe are larger than those of the inner side end of the outer coil pipe, and the section structure of the inner coil pipe and the section structure of the outer coil pipe are symmetrically arranged. Wherein a threaded pipe layer is arranged on the outer side of the outer coil pipe, and air holes are formed in the threaded pipe layer. The device has the following beneficial effects that the inner coil pipe and the outer coil pipe are arranged to be bent pipelines, meanwhile, the heat exchange area of the inner coil pipe and the outer coil pipe with heat flow under the same horizontal width is increased through the structural arrangement, and the flowing time and the stopping time of the heat flow in interlayer pipelines are prolonged; and the overall heat exchange capacity of the device is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pipe processing equipment, and particularly relates to a double helix heat exchanger coil. BACKGROUND

[0002] In the full premix condensing heat exchanger, the coil is usually used for preheating combustion air, and high-temperature flue gas waste heat is used to heat the air to promote stable combustion of the fuel. On the other hand, the coil is used for heating the heated medium, such as water in a heating system, which is delivered to the heating terminal after absorbing heat in the coil. In the existing heat exchanger coil, the surface of the coil as a whole has limited heat exchange effect due to the limitation of the coil structure.

[0003] For example, patent application No. CN104501628A discloses a double helix flat heat exchange unit and a double helix flat heat exchanger, which exchanges heat with the heat flow generated by the central burner through the inner and outer helical cylinders connected with each other. However, the coil adopts a long flat tube structure, and the contact area with the heat flow is always limited. At the same time, the heat flow can quickly pass through the interlayer gap, which leads to too fast heat exchange time of the contact surface with the heat flow, and the overall heat exchange efficiency of the device is not high. SUMMARY

[0004] An object of the utility model is to solve at least the above problems and / or defects, and to provide at least the advantages to be explained later.

[0005] In order to achieve these objects and other advantages according to the utility model, a double helix heat exchanger coil is provided, which comprises:

[0006] The inner coil is provided with a fluid inlet I at the bottom;

[0007] The outer coil is arranged around the outer periphery of the inner coil, and the outer coil is provided with a fluid outlet II at the bottom. The top of the outer coil is communicated with the upper end of the inner coil through a U-shaped tube.

[0008] The cross sections of the inner coil and the outer coil are both arranged in a curved long flat structure. The thickness and the horizontal height of the inner side end of the inner coil are greater than those of the outer side end of the inner coil. The thickness and the horizontal height of the outer side end of the outer coil are greater than those of the inner side end of the outer coil. The cross section structures of the inner coil and the outer coil are symmetrically arranged.

[0009] The outer side of the outer coil is provided with a threaded pipe layer, and the threaded pipe layer is provided with air holes penetrating through both sides of the threaded pipe layer.

[0010] Preferably, the inner ring of the inner coil is provided with heat absorption fins arranged in a spiral.

[0011] Preferably, a plurality of convexes are arranged between two adjacent inner coil layers, the plurality of convexes are arranged equidistantly on the same side of the inner coil, and the ends of the plurality of convexes abut against the single-layer inner coil in front.

[0012] A plurality of convexes are arranged between two adjacent outer coil layers, the plurality of convexes are arranged equidistantly on the same side of the outer coil, and the ends of the plurality of convexes abut against the single-layer outer coil in front.

[0013] Preferably, the U-shaped structure of the threaded pipe layer is in an open expanding type, and two ends of the U-shaped structure of the threaded pipe layer are fixedly connected with two adjacent outer coil layers.

[0014] Preferably, the top outer ring of the inner coil and the top inner ring of the outer coil are fixed by a plurality of connecting pieces, and the bottom outer ring of the inner coil and the bottom inner ring of the outer coil are fixed by a plurality of connecting pieces.

[0015] The device has the following beneficial effects: the inner coil and the outer coil are arranged as curved long and flat pipelines, the heat exchange area of the inner coil and the outer coil and the heat flow is increased under the same horizontal width, the interlayer pipeline of the inner coil and the outer coil is arranged as an arc shape, the probability of turbulent flow of the heat flow in the interlayer pipeline is increased, the setting of the threaded pipe layer increases the residence time of the heat flow in the interlayer gap of the outer coil, and the heat exchange efficiency of the outer coil is improved. The above-mentioned structure as a whole further improves the heat exchange capacity of the device as a whole.

[0016] Other advantages, objects and features of the present application will be apparent from the following description, and will be understood by those skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a double helix heat exchanger coil;

[0018] Figure 2 It is a sectional view of the structure;

[0019] Figure 3 It is an enlarged view of the sectional structure;

[0020] Figure 4 It is a sectional structure side view;

[0021] Figure 5 It is a heat flow direction diagram.

[0022] Markings in the figure: 1, inner coil, 2, outer coil, 11, fluid inlet I, 21, fluid outlet II, 3, U-shaped pipe, 22, threaded pipe layer, 221, air hole, 12, heat absorbing sheet, 14, connecting piece. DETAILED DESCRIPTION

[0023] The utility model makes further detailed description in combination with the drawings, to enable the person skilled in the art to implement according to the description of the specification. It should be understood that the terms such as "have", "contain" and "include" used in this paper do not exclude the presence or addition of one or more other elements or combinations thereof. It should be noted that in the description of the utility model, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, structure and operation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, can be the communication between two elements, and those skilled in the art can understand the specific meaning of the above terms in the utility model according to the specific circumstances. In addition, in the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0024] As shown in Figures 1-4 A double helix heat exchanger coil, comprising:

[0025] The inner coil 1 is provided with a fluid inlet Ⅰ 11 at the bottom;

[0026] The outer coil 2 is arranged around the outer periphery of the inner coil 1, and the outer coil 2 is provided with a fluid outlet Ⅱ 21 at the bottom, and the top of the outer coil 2 is communicated with the upper end of the inner coil 1 through the U-shaped pipe 3;

[0027] The cross section of the inner coil 1 and the outer coil 2 is arranged as a curved long and flat structure, the thickness and the horizontal height of the inner side end of the inner coil 1 are greater than those of the outer side end of the inner coil 1, the thickness and the horizontal height of the outer side end of the outer coil 2 are greater than those of the inner side end of the outer coil 2, and the cross section structure of the inner coil 1 and the outer coil 2 is symmetrically arranged;

[0028] The outer coil 2 is provided with a threaded pipe layer 22, the cross section of the threaded pipe layer 22 is provided with a U-shaped structure with an expanding opening, the U-shaped structure of the threaded pipe layer 22 is respectively fixedly connected with two adjacent outer coil layers, and the threaded pipe layer 22 is provided with air holes 221 penetrating through both sides of the threaded pipe layer.

[0029] Working principle: before the heat exchanger starts to work, the heating pipeline needs to pre-feed water flow to the fluid inlet 111 on the inner coil 1, the water flow flows along the upper end of the inner coil 1, and flows into the outer coil 2 through the U-shaped pipe 3, and finally flows through the fluid outlet 121 and returns to the heating pipeline, and then when the operator opens the heat exchanger, the burner starts to burn, and generates horizontal outwardly spraying flame, smoke and heat flow outside the burner.

[0030] In this process, most of the heat flow and smoke flow out from the interlayer gap of the inner coil 1. The inner coil 1 and the outer coil 2 are provided as arc-shaped long and flat pipes, so that the area of the coil surface contacting the heat flow is larger at the same horizontal width, thereby increasing the heat absorption effect of the coil, further improving the heat conduction efficiency of the inner coil 1, and the interlayer channel of the inner and outer coils 1 is provided as an arc shape to increase the turbulent effect of the heat flow.

[0031] Then the heat flow flowing out of the interlayer channel of the inner coil 1 will again be turbulent in the vertical channel between the inner coil 1 and the outer coil 2, and generate two heat flows flowing downward and outward to the interlayer direction of the outer coil 2. The cross section of the interlayer channel of the outer coil 2 is also provided as an arc shape to increase the turbulent effect of the heat flow, and the heat flow flowing along the interlayer channel of the outer coil 2 can fully exchange heat between the outer coil 2. Finally, part of the heat flow flowing out of the outer coil 2 will pass through the air holes 221 on both sides of the threaded pipe layer 22 and flow out along the oblique front two sides (as shown in Figure 5 ), and the remaining part will flow downward along the interlayer channel of the outer coil 2.

[0032] In the above process, when the hot stream with a certain amount of water vapor and a lower temperature is exchanged with the coil body in the heat exchanger, the water vapor in the hot stream will release heat when it encounters the lower temperature coil surface, and will change from gas to liquid and condense into water droplets attached to the coil. The structure of the inner coil 1 outer ring and the outer coil 2 inner ring being lower than the inner coil 1 inner ring and the outer coil 2 outer ring allows these liquids to slide down the coil surface, avoiding the evaporation of water vapor to take away heat, resulting in insufficient heat exchange efficiency of the coil, and also avoiding the subsequent accumulation of water vapor causing corrosion of the coil surface. At the same time, the setting of the threaded pipe layer 22 also increases the contact area of the outer coil 2 with the hot stream, further improving the heat exchange capacity of the outer coil 2, and the structure of the expanded opening can increase the turbulent effect of the hot stream on the outside of the outer coil 2, improving the heat exchange capacity of the outer coil, and the threaded pipe layer 2 also increases the residence time of the remaining hot stream and flue gas between the layers and on the outside of the outer coil 2, making up for the temperature difference caused by the outer coil 2 being far away from the burner.

[0033] In the above technical solution, the inner coil 1 inner ring is provided with heat-absorbing fins 12 arranged in a spiral.

[0034] Through the above setting, the heat-absorbing fins 12 are used to increase the contact area of the inner coil 1 with the heat generated by the central burner of the heat exchanger, so that the fluid in the inner coil 1 can absorb more heat, thereby increasing the overall heat exchange efficiency of the device.

[0035] In the above technical solution, a plurality of convexities (not shown) are arranged between adjacent two layers of the inner coil 1, the plurality of convexities are arranged in a spiral and equidistant on the same side of the inner coil 1, and the end portions of the plurality of convexities abut against the single layer of the inner coil 1 opposite to them.

[0036] A plurality of convexities (not shown) are arranged between adjacent two layers of the outer coil 2, the plurality of convexities are arranged in a spiral and equidistant on the same side of the outer coil 2, and the end portions of the plurality of convexities abut against the single layer of the outer coil 2 opposite to them.

[0037] Through the above setting, the plurality of convexities ensure that the interlayer gap of the inner coil 1 and the outer coil 2 always remains fixed, to ensure the stability of the inner coil 1 and the outer coil 2 as an integrated structure. Secondly, the setting of the convexities also increases the contact area of the hot stream flowing through the inner coil 1 and the outer coil 2, and causes the hot stream to become turbulent, increasing the residence time of the hot stream, thereby further improving the heat exchange efficiency of the device.

[0038] In the above technical solution, the widest interlayer spacing of the inner coil 1 is controlled within a distance of 0.8-1 mm, and the widest interlayer spacing of the outer coil 2 is controlled within a distance of 0.8-1 mm.

[0039] Through the above setting, the distance between the two adjacent coils is always controlled within a given range, when the hot stream and flue gas generated by the burner flows through the interlayer gap between the inner coil 1 and the outer coil 2, the interlayer distance of 0.8-1mm can ensure that the hot stream has sufficient time to contact the surface of the inner coil 1 and the surface of the outer coil 2 and then exchange heat.

[0040] In the above technical solution, the outer ring of the top of the inner coil 1 and the inner ring of the top of the outer coil 2 are fixed by a plurality of connecting pieces 4, and the outer ring of the bottom of the inner coil 1 and the inner ring of the bottom of the outer coil 2 are fixed by a plurality of connecting pieces 4 (the connecting piece 4 fixing mode can be set to one of a plurality of welding modes).

[0041] Through the above setting, the connecting piece 4 ensures the structural stability of the upper end of the inner coil 1 and the upper end of the outer coil 2, and the structural stability between the lower end of the inner coil 1 and the lower end of the outer coil 2, and enables the inner coil 1 and the outer coil 2 to be stably fixed in the heat exchanger, ensuring the structural stability of the heat exchanger.

[0042] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A double helix heat exchanger coil, comprising: an inner coil, the bottom of which is provided with a fluid inlet I; an outer coil, which is arranged around the outer periphery of the inner coil, the bottom of which is provided with a fluid outlet II, and the top of which is communicated with the upper end of the inner coil through a U-shaped tube, characterized in that: the cross section of the inner coil and the outer coil is arranged in a curved long and flat structure, the thickness and the horizontal height of the inner side end of the inner coil are greater than those of the outer side end of the inner coil, the thickness and the horizontal height of the outer side end of the outer coil are greater than those of the inner side end of the outer coil, and the cross section structures of the inner coil and the outer coil are symmetrically arranged; wherein, the outer side of the outer coil is provided with a threaded pipe layer, the cross section of the threaded pipe layer is arranged in a U-shaped structure with an expanding opening, the two ends of the U-shaped structure of the threaded pipe layer are respectively fixedly connected with the adjacent two layers of the outer coil layer, and the threaded pipe layer is provided with air holes penetrating through both sides of the threaded pipe layer.

2. The double helix heat exchanger coil of claim 1, wherein, The inner ring of the inner coil is provided with heat absorption fins arranged in a spiral.

3. The double helix heat exchanger coil of claim 2, wherein, A plurality of convexes are arranged between adjacent two inner coil layers, the plurality of convexes are arranged in a spiral and equidistant on the same side of the inner coil, and the end of the plurality of convexes abuts against the single layer of the inner coil directly opposite to the plurality of convexes. A plurality of convexes are arranged between adjacent two outer coil layers, the plurality of convexes are arranged in a spiral and equidistant on the same side of the outer coil, and the end of the plurality of convexes abuts against the single layer of the outer coil directly opposite to the plurality of convexes.

4. The double helix heat exchanger coil of claim 3, wherein, The widest distance between the inner coil layers is controlled within a distance of 0.8-1 mm, and the widest distance between the outer coil layers is controlled within a distance of 0.8-1 mm.

5. The double helix heat exchanger coil of claim 4, wherein, The outer ring of the top of the inner coil and the inner ring of the top of the outer coil are fixed by a plurality of connecting pieces, and the outer ring of the bottom of the inner coil and the inner ring of the bottom of the outer coil are fixed by a plurality of connecting pieces.

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