A heat exchange core and a heat exchanger with the same

Abstract

The application relates to a heat exchange core body, which comprises a center cylinder (1) and heat exchange pipes (2), the center cylinder (1) has an outer peripheral wall (10) which is in a wavy structure in the axial direction, the heat exchange pipes (2) are spirally wound on the outer peripheral wall (10) of the center cylinder (1) in the axial direction to form spiral pipes (20), the spiral pipes (20) have a plurality of spiral sections in the axial direction, the shape of the spiral pipes (20) matches the shape of the center cylinder (1), and thus the adjacent spiral sections of the spiral pipes (20) are staggered with each other in the axial direction. The application further discloses a heat exchanger with the heat exchange core body. Compared with the prior art, the application can improve the heat exchange efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heat exchanger, and particularly relates to a heat exchange core body and a heat exchanger with the same. BACKGROUND

[0002] The existing heat exchange core body has a central cylinder and heat exchange pipes spirally wound on the outer periphery of the central cylinder, and the central cylinder is mostly a straight cylinder structure. The heat exchange pipes are spirally wound into multiple layers of spiral pipes from the inside to the outside, and each layer of spiral pipe is a straight cylinder structure consistent with the shape of the central cylinder, such as the structures disclosed in Patent No. ZL201220575936.3, Utility Model for Heat Exchanger Structure (Authorized Publication No. CN202902937U) and Patent No. ZL201420757685.X, Utility Model for High Heat Exchange Efficiency Spiral Pipe Heat Exchanger (Authorized Publication No. CN204388658U).

[0003] The existing heat exchange core body has the following technical problems to be solved: taking a vertical heat exchange core body as an example, the shell side medium is mostly exchanged with the medium in the heat exchange pipe through the gap between the radially adjacent two layers of spiral pipes, and the spiral segments of the same layer of spiral pipe (formed after winding around the central cylinder once) are overlapped in the up-down direction, so that the shell side medium is difficult to enter between the adjacent spiral segments of the same layer of spiral pipe in the up-down direction, thereby affecting the heat exchange efficiency of the whole heat exchanger. SUMMARY

[0004] The first technical problem to be solved by the present application is to provide a heat exchange core body to improve the heat exchange efficiency in view of the current situation of the prior art.

[0005] The second technical problem to be solved by the present application is to provide a heat exchanger with the above heat exchange core body.

[0006] The technical solution adopted by the present application to solve the above first technical problem is as follows: a heat exchange core body comprising:

[0007] a central cylinder having an outer peripheral wall;

[0008] a heat exchange pipe spirally wound on the outer peripheral wall of the central cylinder in the axial direction to form a spiral pipe, the spiral pipe having a plurality of spiral segments in the axial direction;

[0009] characterized in that:

[0010] the outer peripheral wall of the central cylinder presents a wave-shaped structure in the axial direction;

[0011] the shape of the spiral pipe matches the shape of the central cylinder, so that the adjacent spiral segments of the spiral pipe are staggered with each other in the axial direction.

[0012] The spiral pipe of the present application can be wound by one heat exchange pipe according to the prior art, or can be wound by multiple heat exchange pipes at the same time, regardless of which way is adopted, the adjacent spiral segments of the spiral pipe in the present application refer to the two adjacent segments in the axial direction. When winding by one heat exchange pipe, the adjacent spiral segments are connected; when winding by multiple heat exchange pipes at the same time, the adjacent spiral segments are not connected.

[0013] In this way, the spiral segments axially staggered with each other can increase the contact area between the pipe wall of the spiral segment and the heat exchange medium, thereby improving the heat exchange efficiency.

[0014] To further improve the heat exchange efficiency, preferably, the heat exchange pipe is spirally wound into multiple layers of the spiral pipe from the inside to the outside, the shape of each layer of the spiral pipe matches the shape of the central cylinder, and the adjacent spiral segments of the adjacent two layers of the spiral pipe are also radially staggered with each other. In this way, the heat exchange efficiency can be further improved.

[0015] Due to the fact that the adjacent spiral segments of the spiral pipe in the axial direction are staggered with each other in the present application, the axial spiral segment pipe wall of the heat exchange pipe is easy to attach substances and affect the heat exchange of the heat exchange pipe. Therefore, preferably, a cleaning pipe is also included, which is spirally wound in each layer of the spiral pipe along the spiral direction of the heat exchange pipe, and the pipe wall of the cleaning pipe is provided with multiple through holes, so that the liquid sprayed from the through holes can flush the pipe wall of the heat exchange pipe.

[0016] To further improve the cleaning efficiency, preferably, for the cleaning pipe and the heat exchange pipe in the same layer of the spiral pipe, part of the multiple through holes on the cleaning pipe is opposite to the pipe wall of the adjacent spiral segment of the heat exchange pipe.

[0017] For the cleaning pipe and the heat exchange pipe in the adjacent two layers of the spiral pipe, the adjacent two layers of the spiral pipe are referred to as the first layer of the spiral pipe and the second layer of the spiral pipe, part of the multiple through holes of the cleaning pipe in the first layer of the spiral pipe is opposite to the gap between the adjacent two spiral segments of the heat exchange pipe in the second layer of the spiral pipe. In this way, the liquid sprayed from the through holes can be used to clean the position of the spiral segment which is easy to accumulate dirt.

[0018] In the above-mentioned schemes, preferably, the central cylinder is vertically arranged, and the contour line of the longitudinal section thereof includes a first wave-shaped line and a second wave-shaped line extending upward and downward, and the first wave-shaped line and the second wave-shaped line are symmetrically arranged with the central axis of the central cylinder as the center.

[0019] Preferably, the first wave-shaped line is connected by multiple groups of unit-shaped lines in sequence along the axial direction, each group of unit-shaped lines includes a first circular arc line and a second circular arc line having the same radius and arranged in an S shape, the second circular arc line is located above the first circular arc line, and the lower end of the second circular arc line is smoothly connected with the upper end of the first circular arc line, and the first and second circular arc lines are symmetrically arranged with their respective center lines perpendicular to the central axis of the central cylinder as the center.

[0020] Further, the radius of the first and second circular arc lines is R, the outer diameter of the heat exchange pipe is d, the horizontal line passing through the lower end of the first circular arc line is the X axis, and the central axis of the central cylinder is the Y axis to establish a coordinate system, the coordinates of the lower end of the first circular arc line are (-a, 0), the coordinates of the upper end of the first circular arc line and the lower end of the second circular arc line are (-a, 2b), and the coordinates of the upper end of the second circular arc line are (-a, 4b), the equation of the first circular arc line is [x1-(R 2 -b 2 ) 1 / 2 +a] 2 +(y1-b) 2 =R 2 , and the equation of the second circular arc line is [x2+(R 2 -b 2 ) 1 / 2 +a] 2 +(y2-3b) 2 =R 2 , wherein 0≤y1≤2b, -a≤x1≤0, 2b≤y2≤4b, -a≤x2≤0, 10d

[0021] The specific wave-shaped structure and the size design in the application are beneficial to improve the heat exchange effect, so that the heat exchange pipe wound on the outer periphery of the central cylinder can be in contact with the medium outside the heat exchange pipe in a large area, and the spiral winding of the heat exchange pipe is facilitated, so that the overall structure of the wound heat exchange pipe is stable.

[0022] In the above schemes, preferably, at least two pad strips are further included and are arranged on the outer peripheral wall of the central cylinder in a circumferential direction, each pad strip extends in the axial direction of the central cylinder and is in a wave shape matching the shape of the outer peripheral wall of the central cylinder, and the heat exchange pipe is wound on the outer periphery of each pad strip. In this way, the pad strip can constrain the winding position of the heat exchange pipe.

[0023] The technical scheme adopted by the application to solve the second technical problem is: a heat exchanger, having a shell side cylinder arranged vertically, and a tube sheet arranged at both ends of the shell side cylinder, characterized in that it further comprises a heat exchange core as described above, which is arranged vertically in the shell side cylinder, and the two ends of the central cylinder are constrained to the corresponding tube sheets.

[0024] Preferably, the two ends of the central cylinder are straight cylinders extending upward and downward, and the outer peripheral wall of the central cylinder between the two ends is in the wave shape described above.

[0025] Compared with the prior art, the application has the advantages that: by designing the outer peripheral wall of the central cylinder to have a wave-shaped structure in the axial direction, the heat exchange pipes are helically wound on the outer peripheral wall of the central cylinder to form a spiral pipe matching the shape of the central cylinder, so that in the axial direction, adjacent spiral sections of the spiral pipe are staggered with each other, so that the axial spiral section pipe wall of each heat exchange pipe is not completely blocked by the axially adjacent spiral section, so that in use, when the shell side medium flows axially, the axial spiral section pipe wall of the heat exchange pipe can have a larger contact area with the shell side medium to fully contact, thereby effectively improving the heat exchange efficiency of the heat exchange pipe. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Figure 1 is a schematic view of the structure of the heat exchange core in Embodiment One of the application (only the innermost spiral pipe is shown);

[0027] Figure 2 Figure 2 is an enlarged view of part A in Figure 1; Figure 1

[0028] Figure 3 Figure 3 is a longitudinal sectional view of Figure 1; Figure 1

[0029] Figure 4 Figure 4 is an enlarged view of part B in Figure 1; Figure 3

[0030] Figure 5 Figure 5 is a longitudinal sectional view of the partial structure of the heat exchange core in Embodiment One of the application (showing the distribution structure between the multi-layer spiral pipe and the central cylinder);

[0031] Figure 6 Figure 6 is a schematic view of the profile line of the longitudinal section of the central cylinder in Embodiment One of the application;

[0032] Figure 7 Figure 7 is a schematic view of the structure of the heat exchanger in Embodiment One of the application;

[0033] Figure 8 Figure 8 is a longitudinal sectional view of the partial structure of the multi-layer spiral pipe in Embodiment Two of the application. DETAILED DESCRIPTION

[0034] The application will be further described in detail below with reference to the embodiments of the drawings.

[0035] Embodiment One:

[0036] As shown in Figure 1, which is a preferred Embodiment One of a heat exchange core and a heat exchanger having the heat exchange core of the application, the heat exchange core comprises a central cylinder 1, heat exchange pipes 2, and a gasket strip 4. Figures 1 to 7

[0037] ​​​​The center tube 1 is vertically arranged and has a main body part extending upward and downward and end parts at both ends of the main body part, and the two end parts of the center tube 1 are both straight tubes 1a extending upward and downward. The main body part of the center tube 1 has an outer peripheral wall 10, and the outer peripheral wall 10 has a wavy structure in the axial direction. Specifically, as follows:

[0038] The profile line of the longitudinal section of the main body part of the center tube 1 includes a first wavy line 11 and a second wavy line 12 extending upward and downward, and the first wavy line 11 and the second wavy line 12 are symmetrically arranged left and right around the central axis of the center tube 1. The shape of the first wavy line 11 is described as follows: the first wavy line 11 is connected by a plurality of groups of unit lines in sequence along the axial direction, and each group of unit lines includes a first circular arc line 111 and a second circular arc line 112 having the same radius and arranged in an S shape, the second circular arc line 112 is located above the first circular arc line 111, and the lower end of the second circular arc line 112 is smoothly connected to the upper end of the first circular arc line 111, and the first and second circular arc lines are symmetrically arranged around their respective center lines perpendicular to the central axis of the center tube 1. Denote the radius of the first and second circular arc lines as R, and the outer diameter of the heat exchange tube 2 as d, and establish a coordinate system with a horizontal line passing through the lower end of the first circular arc line 111 as the X-axis and the central axis of the center tube 1 as the Y-axis, as shown in Figure 6 The coordinates of the lower end of the first circular arc line 111 are (-a, 0), the coordinates of the upper end of the first circular arc line 111 and the lower end of the second circular arc line 112 are (-a, 2b), and the coordinates of the upper end of the second circular arc line 112 are (-a, 4b). The equation of the first circular arc line 111 is [x1-(R 2 -b 2 ) 1 / 2 +a] 2 +(y1-b) 2 =R 2 , and the equation of the second circular arc line 112 is [x2+(R 2 -b 2 ) 1 / 2 +a] 2 +(y2-3b) 2 =R 2 , wherein 0≤y1≤2b, -a≤x1≤0, 2b≤y2≤4b, -a≤x2≤0, 10d

[0039] The above-mentioned pad 4 has at least two and is arranged on the outer peripheral wall 10 of the center tube 1 in a circumferential direction, and each pad 4 extends along the axial direction of the center tube 1 and has a wavy shape matching the shape of the outer peripheral wall 10 of the center tube 1.

[0040] The heat exchange tube 2 is spirally wound along the axial direction on the outer periphery of each gasket strip 4 to form a spiral tube 20, the spiral tube 20 has a plurality of spiral segments in the axial direction, the shape of the spiral tube 20 matches the shape of the central cylinder 1, and the adjacent spiral segments of the spiral tube 20 are staggered with each other in the axial direction. In this embodiment, the heat exchange tube 2 is spirally wound into a plurality of layers of spiral tubes 20 from inside to outside, the shape of each layer of spiral tube 20 matches the shape of the central cylinder 1, the adjacent two layers of spiral tubes 20 are arranged in a spaced manner, and the adjacent spiral segments of the adjacent two layers of spiral tubes 20 are also staggered with each other in the radial direction.

[0041] As shown in Figure 7 , the heat exchanger of this embodiment has a shell side cylinder 5 arranged vertically, tube sheets 6 arranged at both ends of the shell side cylinder 5, and the heat exchange core body described above, the heat exchange core body is arranged vertically in the shell side cylinder 5, and the two ends of the central cylinder 1 are respectively constrained on the corresponding tube sheet 6. The two ends of the heat exchange tube 2 are respectively supported on the corresponding tube sheet 6.

[0042] The structure of the heat exchange core body in this embodiment enables the shell side medium to pass between the adjacent two spiral tubes 20 and contact the side wall of the corresponding spiral segment to achieve heat exchange; at the same time, the shell side medium can also directly contact the top wall and the bottom wall of each spiral segment, thereby improving the heat exchange efficiency.

[0043] Embodiment two:

[0044] As shown in Figure 8 , this is a preferred embodiment two of the heat exchange core body and the heat exchanger with the heat exchange core body of the present application, which is basically the same as embodiment one, the difference lies in that the heat exchange core body in this embodiment further comprises a cleaning tube 3, which is spirally wound in each layer of spiral tube 20 along the spiral direction of the heat exchange tube 2, and the tube wall of the cleaning tube 3 is provided with a plurality of through holes 30. For the cleaning tube 3 and the heat exchange tube 2 in the same layer of spiral tube 20, part of the through holes 30 in the plurality of through holes 30 on the cleaning tube 3 are opposite to the tube wall of the adjacent spiral segment of the heat exchange tube 2; for the cleaning tube 3 and the heat exchange tube 2 in the adjacent two layers of spiral tube 20, the adjacent two layers of spiral tube 20 are referred to as the first layer of spiral tube and the second layer of spiral tube, part of the through holes 30 in the plurality of through holes 30 of the cleaning tube 3 in the first layer of spiral tube are opposite to the gap between the adjacent two spiral segments of the heat exchange tube 2 in the second layer of spiral tube. In this way, the liquid sprayed from the through holes 30 of the cleaning tube 3 can flush the tube wall of the adjacent upper and lower spiral segments in the same layer of spiral tube 20 and the gap between the corresponding adjacent two upper and lower spiral segments of the heat exchange tube in the adjacent layer of spiral tube 20, thereby avoiding fouling of the tube wall. At the same time, the two ends of the cleaning tube 3 are respectively supported on the corresponding tube sheet 6, and the flushing liquid can be injected into the cleaning tube 3 through the tube opening of the cleaning tube 3.

Claims

1. A heat exchange core, comprising: The central cylinder (1) has an outer peripheral wall (10); The heat exchange tube (2) is spirally wound along the axial direction on the outer peripheral wall (10) of the central cylinder (1) to form a spiral tube (20), and the spiral tube (20) has multiple spiral segments in the axial direction; Its features are: The outer peripheral wall (10) of the central cylinder (1) has a wavy structure in the axial direction; The shape of the spiral tube (20) matches the shape of the central cylinder (1), such that adjacent spiral segments of the spiral tube (20) are misaligned in the axial direction.

2. The heat exchange core according to claim 1, characterized in that: The heat exchange tube (2) is spirally wound layer by layer from the inside out to form multiple spiral tubes (20). The shape of each spiral tube (20) matches the shape of the central cylinder (1), and the adjacent spiral segments of two adjacent spiral tubes (20) are also misaligned in the radial direction.

3. The heat exchange core according to claim 2, characterized in that: It also includes a cleaning tube (3), which is spirally wound in each layer of spiral tube (20) along the spiral direction of the heat exchange tube (2), and the wall of the cleaning tube (3) is provided with multiple through holes (30).

4. The heat exchange core according to claim 3, characterized in that: For the cleaning tube (3) and heat exchange tube (2) in the same layer of spiral tube (20), some of the through holes (30) on the cleaning tube (3) are opposite to the tube wall of the spiral section of the adjacent heat exchange tube (2); For the cleaning tube (3) and heat exchange tube (2) in two adjacent spiral tubes (20), the two adjacent spiral tubes (20) are referred to as the first spiral tube and the second spiral tube. Some of the through holes (30) in the multiple through holes (30) of the cleaning tube (3) in the first spiral tube are opposite to the gap between two adjacent spiral segments of the heat exchange tube (2) in the second spiral tube.

5. The heat exchange core according to any one of claims 1 to 4, characterized in that: The central cylinder (1) is vertically arranged, and its longitudinal section outline includes a first wavy line (11) and a second wavy line (12) extending vertically. The first wavy line (11) and the second wavy line (12) are arranged symmetrically with the central axis of the central cylinder (1) as the center.

6. The heat exchange core according to claim 5, characterized in that: The first wave-shaped line (11) is formed by connecting multiple sets of unit lines in sequence along the axial direction. Each set of unit lines includes a first arc line (111) and a second arc line (112) with the same radius and arranged in an S-shape. The second arc line (112) is located above the first arc line (111), and the lower end of the second arc line (112) is smoothly connected to the upper end of the first arc line (111). The first and second arc lines are arranged symmetrically with their respective center lines perpendicular to the central axis of the central cylinder (1) as the center.

7. The heat exchange core according to claim 6, characterized in that: Let the radii of the first and second arcs be R, and the outer diameter of the heat exchange tube (2) be d. Establish a coordinate system with the horizontal line passing through the lower end of the first arc (111) as the X-axis and the central axis of the central cylinder (1) as the Y-axis. The coordinates of the lower end of the first arc (111) are (-a, 0), the coordinates of the upper end of the first arc (111) and the lower end of the second arc (112) are both (-a, 2b), and the coordinates of the upper end of the second arc (112) are (-a, 4b). The equation of the first arc (111) is [x1-(R...]. 2 -b 2 ) 1 / 2 +a] 2 +(y1-b) 2 =R 2 The equation of the second arc (112) is [x2+(R 2 -b 2 ) 1 / 2 +a] 2 +(y2-3b) 2 =R 2 Where, 0≤y1≤2b, -a≤x1≤0, 2b≤y2≤4b, -a≤x2≤0, 10d <a<800mm,a<R<5a,0.2R<b<0.7R。 8. The heat exchange core according to any one of claims 1 to 4, characterized in that: It also includes at least two gaskets (4) spaced circumferentially on the outer peripheral wall (10) of the central cylinder (1). Each gasket (4) extends along the axial direction of the central cylinder (1) and is wavy in shape matching the shape of the outer peripheral wall (10) of the central cylinder (1). The heat exchange tube (2) is wound around the outer periphery of each gasket (4).

9. A heat exchanger comprising a vertically arranged shell-side cylinder (5) and tube sheets (6) disposed at both ends of the shell-side cylinder (5), characterized in that... It also includes a heat exchange core as described in any one of claims 1 to 8, which is vertically disposed in the shell-side cylinder (5), and the two ends of the central cylinder (1) are respectively constrained to the corresponding tube sheet (6).

10. The heat exchanger according to claim 9, characterized in that: Both ends of the central cylinder (1) are straight cylinders (1a) extending vertically, and the outer peripheral wall (10) of the portion of the central cylinder (1) located between the two ends has the aforementioned wavy structure.

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