Three-dimensional variable-space heat-exchange plate and equal-flow-path closed heat exchanger

Abstract

The present application relates to the field of heat exchanger, specifically to a three-dimensional variable space bulging heat exchange plate and an equal-flow-path closed heat exchanger. The heat exchange plate comprises two groups of edge-welded fixed plate pieces, the plate bodies of the two plate pieces are fixed by evenly arranged welding points, the plate cavity of the heat exchange plate is pressurized and bulged to form multiple groups of heat exchange medium flow cavities, each heat exchange medium flow cavity is bounded by four groups of rhombic arranged welding points, the adjacent two groups of welding points of the upper and lower two plate pieces form the opening of the heat exchange medium flow cavity, and each opening of the heat exchange medium flow cavity is communicated with the adjacent heat exchange medium flow cavity. The present application can reduce the volume of the heat exchanger while ensuring that the heat exchanger has high heat exchange efficiency, and the heat exchanger is not prone to blockage.

Description

Technical Field

[0001] This invention relates to the field of heat exchangers, specifically a three-dimensional variable space bulging heat exchange plate and a closed heat exchanger with equal flow path. Background Technology

[0002] With the rapid development of heat exchanger technology, non-clean working fluid heat exchangers have been developed for special scenarios involving non-clean working fluids such as petrochemicals, textiles, industrial wastewater containing solid particles, and sewage / sludge containing biomass. Currently, traditional heat exchangers, as described in publication number "CN106403397A", ​​include an inlet manifold, an outlet manifold, and multiple heat exchange tubes connecting the inlet and outlet manifolds. These heat exchange tubes are arc-shaped and spaced apart radially. In this type of annular heat exchange tube / plate structure, a heat exchange medium flow channel is formed within the tube or plate body for the clean working fluid to flow through, while the spaces between adjacent heat exchange tubes constitute a non-clean working fluid flow channel.

[0003] To ensure the flowability of the working fluid in the non-clean side channel and avoid blockage by large particles, the non-clean working fluid flow channel is often wide, resulting in a low convective heat transfer coefficient on one side of the heat exchange medium flow channel, a large heat exchanger volume, and difficulty in extracting heat from the non-clean working fluid. It is impossible to achieve both heat exchange efficiency and heat exchanger volume at the same time, so this problem urgently needs to be solved. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, this invention provides a three-dimensional variable space bulging heat exchange plate and a closed heat exchanger with equal flow path. This invention reduces the size of the heat exchanger while ensuring high heat exchange efficiency, and the heat exchanger is less prone to internal blockage.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A three-dimensional variable space bulging heat exchange plate includes two sets of plates with their edges welded and fixed. The plates are welded and fixed together by uniformly arranged weld points. The plate cavity of the heat exchange plate is pressurized and bulged to form multiple sets of heat exchange medium flow chambers. Each heat exchange medium flow chamber is bounded by four sets of weld points arranged in a diamond shape. The weld points of two adjacent sets of weld points on the upper and lower plates form the openings of the heat exchange medium flow chambers. Each opening of the heat exchange medium flow chamber is connected to the adjacent heat exchange medium flow chamber.

[0007] As a further aspect of the present invention: the weld points are circular, and a spatial rectangular coordinate system is established with the center of the weld point as the origin. The arrangement direction of the heat exchange plates corresponds to the plane formed between the Z-axis and X-axis in the spatial rectangular coordinate system. The distance between two sets of weld points arranged at a distance opposite each other in the heat exchange medium flow cavity is 2S. T The distance between the other two sets of weld points arranged close to each other in the heat exchange medium flow cavity is 2S. LThe maximum expansion height of the heat exchange medium flow cavity along the Y-axis is δ; then, in the spatial rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity along the Y-axis are:

[0008]

[0009] A closed-loop heat exchanger with equal flow path is disclosed, wherein a three-dimensional variable space bulging heat exchange plate is concentrically arranged within a barrel-shaped shell, and N rings of annular heat exchange plates are coaxially arranged within the shell, with the flow path of each heat exchange plate increasing arithmetically from the inside out; the inner cavity of the heat exchange plate forms a heat exchange medium flow channel, and the spaces between adjacent heat exchange plates form a wastewater flow channel; vertically arranged partition weld lines on the heat exchange plates divide the heat exchange medium flow channel of the heat exchange plate into two independent heat exchange zones; each heat exchange plate has a heat exchange medium inlet joint and a heat exchange medium outlet joint in each of its two heat exchange zones; the heat exchange medium outlet joint of one heat exchange zone in the i-th ring of heat exchange plates is connected to the heat exchange medium inlet joint of one heat exchange zone in the N+1-i-th ring of heat exchange plates through a distribution pipe, thereby forming N heat exchange medium channels with the same flow rate.

[0010] As a further embodiment of the present invention: the heat exchange medium inlet joint and the heat exchange medium outlet joint are both located at the bottom of each heat exchange zone. The heat exchange plate is provided with dividing weld lines on the plate body of each heat exchange zone. The dividing weld lines include vertical weld lines and horizontal weld lines that are interleaved. The vertical weld lines and the edge of the heat exchange plate form a medium rising channel corresponding to the position of the heat exchange medium inlet joint. The horizontal weld lines form an S-shaped flow channel. The two ends of the S-shaped flow channel are respectively connected to the medium rising channel and the heat exchange medium outlet joint.

[0011] As a further embodiment of the present invention: the shell is provided with a heat exchange medium inlet pipe and a heat exchange medium outlet pipe, the heat exchange medium inlet pipe delivers heat exchange medium to the corresponding heat exchange zone through an inlet branch pipe; the heat exchange medium outlet pipe receives the heat exchange medium discharged from the corresponding heat exchange zone through an outlet branch pipe.

[0012] As a further aspect of the present invention: uniform flow equalization holes are evenly opened along the circumferential direction on the welding line at the bottom of each heat exchange plate to connect the sewage flow channels on both sides of the heat exchange plate.

[0013] As a further aspect of the present invention: the top of the heat exchange plate is provided with an exhaust hole that communicates with the heat exchange medium flow channel, and the corner openings at the top of the heat exchange plate are used to form overflow ports for sewage to pass through. The overflow ports of each heat exchange plate correspond at the height of the sewage outlet pipe on the shell.

[0014] As a further embodiment of the present invention: a sewage pipe box is provided at the bottom of the shell and is connected to the sewage inlet pipe. The sewage pipe box is provided with distribution holes corresponding to the positions of each sewage flow channel. Each distribution hole provides sewage to each sewage flow channel from bottom to top. A sewage outlet is provided at the bottom of the shell and a sewage discharge connector is provided on the outside of the sewage pipe box.

[0015] As a further embodiment of the present invention: the opening at the top of the shell is closed by a cover, the cover is provided with an inspection hole, and the exhaust holes on each heat exchange plate are all located within the projection range of the inspection hole along the vertical direction; the cover is provided with reinforcing ribs evenly arranged radially, and the cover is also provided with lifting lugs for hoisting the cover.

[0016] As a further embodiment of the present invention: a drive shaft is provided axially inside the housing, the drive shaft is driven to rotate by a drive motor, a cleaning rod is fixed on the drive shaft and arranged radially along the housing, there is an installation gap between the cover and the heat exchange ring plate to allow the cleaning rod to rotate, and vertically arranged brushes are arranged at intervals on the cleaning rod, the brush surface of the brushes is in contact with the plate surface of the corresponding heat exchange plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention features an expansion design for the heat exchange plate. The optimal expansion profile of the heat exchange plate is calculated to maximize its heat exchange efficiency. While reducing the volume of the heat exchanger, it can ensure that the heat exchanger has high heat exchange efficiency and that the heat exchanger is not prone to blockage.

[0019] 2. The equal flow path design of the heat exchange medium flow channel in this invention ensures that the flow cross-sectional area and flow length of all heat exchange medium flow paths are exactly the same when the heat exchange medium passes through the inside of the heat exchanger. This achieves uniform distribution of heat exchange medium flow rate, fully utilizes the heat of the clean working medium, improves heat exchange efficiency, and avoids the inconsistency of flow path between the inner and outer rings of the concentric circle design heat exchange tube, which affects heat exchange.

[0020] 3. The non-clean working fluid of the present invention is distributed to the sewage flow channel between adjacent heat exchange plates through the distribution hole of the sewage pipe box. It flows from bottom to top and flows out of the sewage outlet pipe after being gathered through the overflow port. The vertical flow path is the same, forming a sewage flow path with equal flow path to ensure uniform heat exchange.

[0021] 4. In this invention, there are no pipe obstructions between adjacent heat exchange plates. The cleaning rod is driven by a motor to rotate, which causes the raw sewage to rotate at a concentric speed in the horizontal direction. This rotation increases the flow velocity of the sewage and increases turbulence. On the other hand, the soft bristles on the brush group directly contact the heat exchange surface of the heat exchange plate to remove dirt and biofilm deposits that may have accumulated during long-term operation. The outer side of the plate is always kept in a "brand new" state. While physically removing the biofilm or dirt deposited on the surface, the wall thermal resistance on the sewage side is zero, maintaining the heat exchanger's heat exchange performance and achieving the dual purpose of "preventive self-cleaning" and "enhanced turbulence heat exchange on the non-clean side". Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the heat exchange ring plate after it has been laid out flat in this invention.

[0024] Figure 3 This is a schematic diagram of the flow path of the heat exchange medium distributed by the two sets of heat exchange plates through the distribution pipe in this invention.

[0025] Figure 4 This is a partial cross-sectional view of the heat exchange plate in this invention.

[0026] Figure 5 This is a schematic diagram of the structural layout of the heat exchange ring plate in this invention.

[0027] Figure 6 This is a schematic diagram of the cap structure in this invention.

[0028] In the picture:

[0029] 1. Shell; 11. Heat exchange medium inlet pipe; 111. Inlet branch pipe;

[0030] 12. Heat exchange medium outlet pipe; 121. Outlet branch pipe;

[0031] 13. Distribution pipe; 14. Sewage inlet pipe;

[0032] 141. Sewage pipe box; 142. Distribution hole; 143. Sewage discharge connector;

[0033] 15. Sewage outlet pipe; 16. Sewage discharge outlet;

[0034] 2. Cover; 21. Inspection hole; 22. Lifting lug; 23. Reinforcing rib;

[0035] 3. Drive motor; 4. Drive shaft; 5. Cleaning rod; 51. Brush;

[0036] 6. Heat exchange plate; 60. Zoned welding line; 61. Plate; 62. Heat exchange medium flow chamber; 63. Weld joint;

[0037] 64. Heat exchange medium inlet connector; 65. Heat exchange medium outlet connector;

[0038] 66. Overflow port; 67. Vent hole; 68. Separating welding line; 69. Flow equalization hole. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-6 In this embodiment of the invention, a three-dimensional variable space bulging heat exchange plate and an equal flow diameter closed heat exchanger are provided. The shell 1 has a barrel-shaped structure with an open top and a cover 2 installed at the bottom opening.

[0041] The cover 2 is coaxially fixed to the top of the shell 1. The cover 2 can be integrally welded to the shell 1 or fixed by bolts. An inspection hole 21 is provided on the cover 2, and the exhaust holes 67 of each heat exchange plate 6 are all located within the vertical projection range of the inspection hole 21, ensuring that maintenance personnel can directly open and close the exhaust holes 67 through the inspection hole 21. Reinforcing ribs 23 are evenly arranged radially on the top of the cover 2, and lifting lugs 22 are provided on the cover 2 for hoisting operations.

[0042] Multiple heat exchange plates 6 are coaxially arranged inside the shell 1. Each heat exchange plate 6 has two symmetrically arranged partition welding lines 60 along the vertical direction. The partition welding lines 60 divide the plate cavity of the heat exchange plate 6 into two independent heat exchange zones. The inner cavities of the two heat exchange zones form independent heat exchange medium flow channels.

[0043] The heat exchange plate 6 is a hollow plate, bent and welded to form a ring-shaped plate. The heat exchange plate 6 includes two sets of plates 61, whose edges are welded together. The two plates 61 are also welded together by evenly distributed weld points 63. Pressure is applied between the two sets of plates 61, forming an expanded three-dimensional space between the weld points 63. Specifically, the plates 61 are formed by stacking two metal plates and then using laser or resistance welding. The inlet and outlet pipes are then connected, and the remaining edges of the plates are sealed again using laser or resistance welding. Finally, the plates are formed by hydraulic bulging.

[0044] The solder points 63 are arranged in multiple rows on the vertical surface of the plate 61, with equal spacing between each row and staggered vertical positions between adjacent rows. The four sets of diamond-shaped solder points 63 form a heat exchange medium flow cavity 62. Multiple sets of heat exchange medium flow cavities 62 are provided; each non-edge heat exchange medium flow cavity 62 has four openings, each communicating with the opening of an adjacent heat exchange medium flow cavity 62, thus allowing the heat exchange medium to flow in the expanded three-dimensional space within the heat exchange plate 6. The solder points 63 are preferably annular, with a central hole allowing the medium to pass through from both sides of the heat exchange plate 6.

[0045] A spatial rectangular coordinate system is established with the center of weld point 63 as the origin. The arrangement direction of the heat exchange plate 6 corresponds to the plane formed between the Z-axis and X-axis in the spatial rectangular coordinate system. The distance between the two sets of weld points 63 arranged opposite each other at a distance in the heat exchange medium flow cavity 62 is 2S. T The distance between the other two sets of weld points 63 arranged close to each other in the heat exchange medium flow cavity 62 is 2S.L The maximum expansion height of the heat exchange medium flow cavity 62 along the Y-axis is δ; therefore, in the spatial rectangular coordinate system, the contour coordinates of the heat exchange medium flow cavity 62 along the Y-axis are:

[0046]

[0047] An annular sewage flow channel is formed between adjacent heat exchange ring plates, and the sewage flow channels in each ring are interconnected. A drive motor 3 is installed on the cover 2. The drive motor 3 controls the rotation of the drive shaft 4 through a reducer. The drive shaft 4 extends axially along the housing 1 into the housing 1. A cleaning rod 5 is fixed on the drive shaft 4. The body of the cleaning rod 5 is arranged along the diameter direction of the housing 1. A brush 51 corresponding to the height of the heat exchange ring plate is vertically installed on the cleaning rod 5. Preferably, two sets of brushes 51 are symmetrically arranged in each sewage flow channel. When the drive motor 3 drives the cleaning rod 5 to rotate through the drive shaft 4, the brush surface of the brush 51 is in contact with the body of the heat exchange plate 6 on both sides of the brush 51, and the heat exchange plate 6 is brushed and cleaned.

[0048] The bottom of the housing 1 is provided with a sewage pipe box 141, which is connected to the sewage inlet pipe 14. The sewage pipe box 141 is provided with a plurality of distribution holes 142, the number of distribution holes 142 corresponding to the number of sewage channels. The distribution holes 142 are preferably rectangular holes. The sewage pipe box 141 is also provided with a sewage discharge connector 143, which is used to independently discharge the sludge in the sewage pipe box 141 after opening.

[0049] The outermost heat exchange plate 6 has outer plates 61 that are 0.3–0.5 mm thicker than inner plates. The top of the outermost heat exchange plate 6 has only one set of arc-shaped overflow ports 66 for connection to the wastewater outlet pipe 15. The tops of the other heat exchange plates 6 have two sets of symmetrically arranged overflow ports 66. The interface of the wastewater outlet pipe 15 corresponds in height to the overflow ports 66 of the heat exchange plate 6. Wastewater flowing from bottom to top through the overflow ports 66 is discharged outwards along the wastewater outlet pipe 15. An independent drain port 16 is provided at the bottom of the shell 1. When cleaning the heat exchanger, the dirt or impurities generated during cleaning are directly discharged outwards through the drain port 16. Compared to the wastewater inlet pipe 14, the wastewater outlet pipe 15 should be larger, and its top should be 2–5 cm lower than the total height of the heat exchange plates 6. The arrangement height of the heat exchange medium inlet pipe 11 and the heat exchange medium outlet pipe 12 is preferably higher than the height of the wastewater inlet pipe 14 and the wastewater pipe box 141.

[0050] When the heat exchange plate 6 is laid flat, the vents 67 of both heat exchange zones are located at the top of the heat exchange plate 6. When the heat exchange plate 6 is bent and closed, the vents 67 of both heat exchange zones are arranged adjacently to facilitate subsequent maintenance, cleaning, and commissioning. The heat exchange medium inlet connector 64 and the heat exchange medium outlet connector 65 are located at the two corners at the bottom of each heat exchange zone, receiving or injecting the heat exchange medium along the vertical direction. Separating weld lines 68 are provided on the plate body of both heat exchange zones of the heat exchange plate 6 to change the flow path of the heat exchange medium within the heat exchange plate 6. The trajectory of the separating weld lines 68 is not limited; it can be extended by lengthening the flow path of the heat exchange medium between the heat exchange medium inlet connector 64 and the heat exchange medium outlet connector 65.

[0051] In this embodiment, the separating weld line 68 includes a vertical weld line and a horizontal weld line. The vertical weld line corresponds to the position of the heat exchange medium inlet joint 64. The vertical weld line and the weld seam on one side of the heat exchange plate 6 enclose a medium rising channel. After the heat exchange medium enters the heat exchange plate 6 from the heat exchange medium inlet joint 64, it rises along the medium rising channel to the top of the heat exchange plate 6. Horizontal weld lines are staggered between the vertical weld line and the weld seam on the other side of the heat exchange plate 6. The horizontal weld lines form an S-shaped horizontal flow channel. After the heat exchange medium enters the horizontal flow channel from the medium rising channel, it flows from top to bottom in an S-shaped trajectory within the horizontal flow channel and finally leaves the heat exchange medium outlet joint 65.

[0052] From the inside out, the flow path of the heat exchange medium in each ring of heat exchange plates 6 increases arithmetically. The heat exchange zones of two sets of heat exchange plates 6 located in different rings are connected by a distribution pipe 13, thereby forming a heat exchange medium channel.

[0053] The number of heat exchange plates 6 is unlimited. When there are N heat exchange plates 6, the heat exchange medium outlet joint 65 of one group of heat exchange zones in the i-th heat exchange plate 6 is connected to the heat exchange medium inlet joint 64 of one group of heat exchange zones in the (N+1-i)-th heat exchange plate 6 through the distribution pipe 13. The distribution pipes 13 are preferably arranged in parallel to each other.

[0054] In this embodiment, taking nine rings of heat exchange plates 6 as an example, each ring of heat exchange plates 6 has two heat exchange zones, namely heat exchange zone A and heat exchange zone B. The two heat exchange zones of each ring of heat exchange plates 6 are connected by nine sets of distribution pipes 13, thereby forming nine heat exchange medium channels with the same flow rate. The specific connection method is as follows:

[0055] 1A-9B, 2A-8B, 3A-7B, 4A-6B, 5A-5B, 6A-4B, 7A-3B, 8A-2B, 9A-1B.

[0056] In this diagram, 1A-9B indicates that the heat exchange zone A of the first ring of heat exchange plates 6 (from the inside out) is connected to the heat exchange zone B of the ninth ring of heat exchange plates 6 via a distribution pipe 13. The heat exchange medium inlet connector 64 of the heat exchange zone A of the first ring of heat exchange plates 6 is connected to the heat exchange medium inlet pipe 11 on the shell 1 via an inlet branch pipe 111. The heat exchange medium outlet connector 65 of the heat exchange zone A of the first ring of heat exchange plates 6 is connected to the heat exchange medium inlet connector 64 of the heat exchange zone B of the ninth ring of heat exchange plates 6 via the distribution pipe 13. The heat exchange medium outlet connector 65 of the heat exchange zone B of the ninth ring of heat exchange plates 6 is connected to the heat exchange medium outlet pipe 12 via an outlet branch pipe 121. The connections of the remaining pipes correspond to the above connection methods, and so on.

[0057] The number of inlet branch pipes 111 and outlet branch pipes 121 corresponds to the number of heat exchange plates 6, used for uniformly distributing and merging the heat exchange medium. Uniform flow holes 69 are evenly spaced on the weld seam at the bottom of the heat exchange plate 6. After the heat exchange plate 6 is bent into a ring, the uniform flow holes 69 are evenly arranged around the circumference of the heat exchange plate 6. Sewage in adjacent sewage channels within the heat exchanger can flow freely through the uniform flow holes 69. The width of the horizontal channel formed by the horizontal weld line at the bottom of the heat exchange zone is about 5cm higher than the width of the horizontal channels at other heights. The uniform flow holes 69 are opened at a height of 1cm from the bottom weld line of the heat exchange plate 6, and the diameter of the uniform flow holes 69 is preferably greater than 3cm.

[0058] In the start-up state of the heat exchanger, first open the inspection hole 21 on the cover 2, and inject clean water as the heat exchange medium into each heat exchange plate 6 through the heat exchange medium inlet pipe 11. The clean water flows through the 1A-9B heat exchange medium channels. At this time, the vent holes 67 on both sets of heat exchange plates 1A-9B are open. After the air in the 1A-9B heat exchange medium channels is completely purged, close the vent holes 67 on both sets of heat exchange plates 1A-9B. Repeat this process to completely purge the air from each heat exchange medium channel. Then close the inspection hole 21, tighten the fixing bolts of the inspection hole 21, open the sewage inlet pipe 14, and after the liquid level is level with the inspection hole 21, drive the drive motor 3 to rotate the sewage through the brush 51. Through physical contact, the accumulated dirt on the surface of the heat exchanger 6 is removed. Then loosen the fixing bolts of the inspection hole 21 at intervals. After the air in the sewage channels inside the heat exchanger 6 is purged, tighten the fixing bolts of the inspection hole 21 again. After sealing is complete, open the valve on the sewage outlet pipe 15, and the heat exchanger will start up.

[0059] During operation, wastewater outside the heat exchanger enters the various wastewater channels of the heat exchanger through the distribution holes 142 of the wastewater pipe box 141, and flows freely through the flow equalization holes 69, thus balancing the wastewater level inside the heat exchanger. When the drive motor 3 drives the brush 51 to rotate, it causes the raw wastewater to have a concentric rotational speed in the horizontal direction. This rotation produces two beneficial effects: firstly, the fluid velocity itself increases, increasing turbulence; secondly, the soft bristles on the brush assembly directly and physically contact the heat exchange surface of the heat exchange plate 6, removing dirt and biofilm deposits that may have accumulated during long-term operation, keeping the outer side of the plate always in a "brand new" state.

[0060] During sewage discharge and maintenance, close the sewage outlet pipe 15, and open the sewage outlet 16 at the bottom of the heat exchanger and the sewage drain connector 143 on the sewage pipe box 141. Under gravity, the sewage flows out through the sewage outlet 16 and the sewage drain connector 143. After the sewage has been drained, open the inspection hole 21 and use a high-pressure water gun to rinse from top to bottom to remove the accumulated dirt at the opening of the distribution hole 142 of the sewage pipe box 141. In addition, the sewage inlet pipe 14 and the sewage pipe box 141 can be directly cleaned with a high-pressure water gun. Through water gun cleaning, dirt or impurities can be directly discharged from the sewage outlet 16.

[0061] Using Reynolds number as a variable, under the same conditions of heat exchange medium, heat exchange velocity, and flow rate, the convective heat transfer coefficients of the annular heat exchange plate formed by bending the existing rectangular hollow heat exchange plate and the heat exchange plate 6 of the present invention are compared as shown in Table 1 below. It can be seen that, under the same conditions, the heat exchange efficiency of the heat exchange plate of the present invention is much higher than that of the traditional rectangular hollow heat exchange plate.

[0062] Table 1

[0063]

[0064] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0065] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. An equal flow path closed heat exchanger, characterized by, The shell (1) is coaxially provided with N annular heat exchange plates (6); The heat exchange plate (6) comprises two groups of edge-welded fixed plate pieces (61), the plate bodies of the two plate pieces (61) are fixed by welding through uniformly arranged welding points (63), the plate cavity of the heat exchange plate (6) is pressurized and bulged to form a plurality of groups of heat exchange medium flow cavities (62), each heat exchange medium flow cavity (62) is bounded by four groups of rhombic arrangement welding points (63), the adjacent two groups of welding points (63) of the upper and lower two plate pieces (61) form the opening of the heat exchange medium flow cavity (62), and each opening of the heat exchange medium flow cavity (62) is communicated with the adjacent heat exchange medium flow cavity (62). The flow path of each heat exchange plate (6) is increased in equal difference from inside to outside; the inner cavity of the heat exchange plate (6) forms a heat exchange medium flow channel, and the sewage flow channel is formed between adjacent heat exchange plates (6); the heat exchange plate (6) is vertically provided with a partition welding line (60), the partition welding line (60) divides the heat exchange medium flow channel of the heat exchange plate (6) into two independent heat exchange zones; each heat exchange plate (6) is provided with a heat exchange medium inlet joint (64) and a heat exchange medium outlet joint (65); the heat exchange medium outlet joint (65) of one of the heat exchange zones in the i-th heat exchange plate (6) is communicated with the heat exchange medium inlet joint (64) of one of the heat exchange zones in the N+1-i-th heat exchange plate (6) through a distribution pipe (13), so as to form N groups of heat exchange medium channels with the same flow.

2. An equal flow path closed heat exchanger according to claim 1, wherein The welding points (63) are circular welding points, a space rectangular coordinate system is established with the center of the circle of the welding points (63) as the origin, the plate surface arrangement direction of the heat exchange plate (6) corresponds to the plane formed between the Z axis and the X axis in the space rectangular coordinate system, the distance between two groups of welding points (63) arranged oppositely at a long distance in the heat exchange medium flow cavity (62) is 2S T , the distance between another two groups of welding points (63) arranged oppositely at a short distance in the heat exchange medium flow cavity (62) is 2S L , the maximum bulging height of the heat exchange medium flow cavity (62) along the Y axis direction is δ; then in the space rectangular coordinate system, the profile coordinates of the heat exchange medium flow cavity (62) along the Y axis are:

3. An equal flow path closed heat exchanger according to claim 2, wherein The heat exchange medium inlet joint (64) and the heat exchange medium outlet joint (65) are arranged at the bottom of each heat exchange zone, the heat exchange plate (6) is provided with a partition welding line (68) on the plate body of each heat exchange zone, the partition welding line (68) comprises a vertical welding line and a horizontal welding line arranged alternately, the vertical welding line and the edge of the heat exchange plate (6) form a medium rising channel corresponding to the position of the heat exchange medium inlet joint (64), and the S-shaped flow channel is formed between each horizontal welding line, and the two ends of the S-shaped flow channel are respectively communicated with the medium rising channel and the heat exchange medium outlet joint (65).

4. An equal flow path closed heat exchanger according to claim 2, wherein The shell (1) is provided with a heat exchange medium inlet pipe (11) and a heat exchange medium outlet pipe (12), the heat exchange medium inlet pipe (11) supplies heat exchange medium to the corresponding heat exchange zone through an inlet shunt branch pipe (111); the heat exchange medium outlet pipe (12) receives the heat exchange medium discharged from the corresponding heat exchange zone through an outlet shunt branch pipe (121).

5. An equal flow path closed heat exchanger according to claim 2, wherein The welding line at the bottom of each heat exchange plate (6) is uniformly provided with a flow equalizing hole (69) along the circumference to communicate the sewage flow channels on both sides of the heat exchange plate (6).

6. An equal flow path closed heat exchanger according to claim 2, wherein The top of the heat exchange plate (6) is provided with an exhaust hole (67) communicated with the heat exchange medium flow channel, and the corner end opening of the top of the heat exchange plate (6) forms an overflow port (66) for sewage to pass through, and the overflow port (66) of each heat exchange plate (6) is in height correspondence with the sewage outlet pipe (15) on the shell (1).

7. An equal flow path closed heat exchanger according to claim 6, wherein The bottom of the shell (1) is provided with a sewage pipe box (141) communicated with the sewage inlet pipe (14), and the sewage pipe box (141) is provided with distribution holes (142) corresponding to the positions of the sewage flow channels, each distribution hole (142) providing sewage into each sewage flow channel from bottom to top; the bottom of the shell (1) is provided with a sewage discharge port (16) for discharging sewage outward, and the sewage pipe box (141) is provided with a sewage discharge joint (143) outside the shell (1).

8. An equal flow path closed heat exchanger as claimed in claim 2, wherein, The opening of the top of the shell (1) is closed by a cover (2), the cover (2) is provided with an inspection hole (21), and the exhaust holes (67) on each heat exchange plate (6) are located in the projection range of the inspection hole (21) in the vertical direction; the cover (2) is uniformly provided with a reinforcing rib (23) in the radial direction, and the cover (2) is further provided with a lifting lug (22) for lifting the cover (2).

9. An equal flow path closed heat exchanger according to claim 8, wherein An drive shaft (4) is arranged in the shell (1) in the axial direction, the drive shaft (4) is driven to rotate by a drive motor (3), the drive shaft (4) is fixed with a cleaning rod (5) arranged in the radial direction of the shell (1), there is an installation gap between the cover (2) and the heat exchange ring plate for the rotation of the cleaning rod (5), and the cleaning rod (5) is provided with vertically arranged brushes (51) at intervals, the brush surface of the brush (51) is in contact with the surface of the corresponding heat exchange plate (6).

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