Open heat exchange plate, heat exchange plate pair, heat exchange plate bundle and heat exchanger

Abstract

The application provides an open heat exchange plate, a heat exchange plate pair, a heat exchange plate bundle and a heat exchanger. The open heat exchange plate comprises a plate surface, two ends of the plate surface are raised in the same direction to form two raised areas, a main heat exchange area is arranged between the two raised areas, the raised areas are used for forming inlets and outlets of a first medium flow channel, and the depth of the first medium flow channel at the raised areas is greater than the depth of the first medium flow channel at the main heat exchange area. The open heat exchange plate, the heat exchange plate pair, the heat exchange plate bundle and the heat exchanger provided by the application have the advantages of simple structure, convenient manufacturing process and low production cost, can effectively reduce the flow velocity of the inlet section area of the flow channel, slow down the abrasion phenomenon and prolong the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to an open heat exchange plate, a heat exchange plate pair, a heat exchange plate bundle and a heat exchanger. BACKGROUND

[0002] The plate heat exchanger is a device for transferring part of the heat of hot fluid to cold fluid, which is applied in chemical industry, petroleum, power, food and other fields. The current plate heat exchanger can be divided into gasket type heat exchanger and welded heat exchanger according to different sealing forms. The welded heat exchanger adopts welding sealing between heat exchange plates, which overcomes the gasket temperature resistance problem of the gasket type heat exchanger. The wide channel plate type welded heat exchanger is suitable for heat exchange between fluids containing solid particles and fibrous impurities due to its wide flow channel spacing, which maximizes the cleaning cycle of the heat exchanger, reduces the maintenance cost, and is widely used in alumina industry.

[0003] In the field of application of alumina, due to the presence of a large amount of high-hardness alumina solid particles in the solution, the heat exchanger will be severely abraded and fail, especially at the inlet section of the flow channel. The high-hardness solid particle-containing alumina solution with high flow rate will severely abrade the plate. At the same time, due to the particularity of the production method, a large amount of scarring will be generated during the production process, causing the flow channel to be blocked, thereby reducing the flow area of the flow channel, leading to an increase in the flow rate of the solution at the inlet section of the flow channel, further deteriorating the abrasion at the inlet section of the flow channel, and causing the heat exchanger to fail.

[0004] In order to solve the problem of inlet abrasion, the common solution is to perform local spraying on the port of the heat exchange plate to improve the abrasion resistance of the inlet of the flow channel. However, this method has high manufacturing cost and complex process, and due to the limitation of the process, the spraying coverage distance is small, and the effect of improving abrasion is limited. Another solution is to improve the structure of the heat exchange plate, and adopt the form of flat plate spot welding distance column at the port of the heat exchange plate to make the inlet of the flow channel smoother. However, this method greatly reduces the heat exchange effect, the structure is more complex, the manufacturing cost is also high, and the flow rate of the inlet of the flow channel is not greatly changed, so the effect of improving abrasion is limited. Therefore, there is an urgent need for a heat exchange plate with low manufacturing cost and effective improvement of the abrasion phenomenon at the inlet of the flow channel. SUMMARY

[0005] Therefore, the purpose of the present application is to provide an open heat exchange plate, a heat exchange plate pair, a heat exchange plate bundle and a heat exchanger to solve the problems mentioned in the background.

[0006] In order to achieve the above object, the present application provides a first aspect of an open heat exchange plate, comprising: a plate surface, two ends of the plate surface are raised in the same direction to form two raised areas, a main heat exchange area is between the two raised areas, the raised areas are used to form the inlet and outlet of a first medium flow channel, so that the depth of the first medium flow channel at the raised areas is greater than the depth at the main heat exchange area.

[0007] Further, a first pressing area is arranged on the side of the raised area away from the main heat exchange area, the first pressing area is used for connecting the open heat exchange plates; a second pressing area is arranged on the outer side of the raised area and the main heat exchange area along the length direction of the plate surface, the second pressing area is used for connecting the open heat exchange plates; a flow channel connecting port is arranged on the second pressing area, the flow channel connecting port is used for forming the inlet and outlet of a second medium flow channel; a third pressing area is arranged on the edge of the plate surface along the length direction, the third pressing area is connected with the second pressing area and is arranged reversely, and is used for connecting the open heat exchange plates.

[0008] Further, the flow channel connecting port is arranged close to the edge of the plate surface along the width direction, the distance between the flow channel connecting port and the edge is a first distance, and the length of the raised area along the length direction of the plate surface is less than or equal to twice the first distance.

[0009] Further, the minimum distance between the top surface of the first pressing area and the plate surface in the raised area is greater than or equal to 1 mm, the first distance is 90 mm to 150 mm, and the length of the raised area along the length direction of the plate surface is 60 mm to 300 mm.

[0010] Further, a plurality of protrusions are arranged on the plate surface, the protrusions are located on the raised side of the plate surface, and the top surfaces of the plurality of protrusions are on the same plane; in the raised area, the angle between the side surface of the protrusion close to the main heat exchange area and the plane where the top surface of the protrusion is located is a first angle, the angle between the side surface of the protrusion away from the main heat exchange area and the plane where the top surface of the protrusion is located is a second angle, and the first angle is greater than or equal to the second angle.

[0011] Further, the angle between the side surface of the protrusion in the main heat exchange area and the plane where the top surface of the protrusion is located is a third angle, the third angle is greater than or equal to the first angle and less than or equal to 40°.

[0012] Further, the length of the top surface of the protrusion is 8 mm to 20 mm, the distance between adjacent two protrusions is 30 mm to 60 mm, and the height of the protrusion in the main heat exchange area is 2.5 mm to 7 mm.

[0013] In a second aspect, the application provides a heat exchange plate pair, comprising two open heat exchange plates as described in the first aspect, oppositely arranged, and the raised areas of the two open heat exchange plates are respectively abutted, forming a second medium flow channel between the two open heat exchange plates.

[0014] In a third aspect, the application provides a heat exchange plate bundle, comprising a plurality of stacked heat exchange plate pairs as described in the second aspect, a first medium flow channel is formed between adjacent two heat exchange plate pairs, and the raised areas of the adjacent two heat exchange plate pairs are respectively connected, forming an inlet and an outlet of the first medium flow channel.

[0015] In a fourth aspect, the application provides a heat exchanger, comprising the heat exchange plate bundle as described in the third aspect.

[0016] As can be seen from the above, the open heat exchange plate, the heat exchange plate pair, the heat exchange plate bundle and the heat exchanger provided by the application can form a raised area by raising the end of the plate surface, the raised area is used to form the inlet and outlet of the first medium flow channel, the plate surface without being raised is the main heat exchange area, which is used to form the middle flow channel of the first medium flow channel, so that the depth of the first medium flow channel at the raised area is greater than that at the main heat exchange area, that is, the cross-sectional area of the first medium flow channel at the inlet and outlet is increased, thereby reducing the flow rate of the first medium at the inlet and outlet, thereby weakening the erosion effect of the first medium on the heat exchange plate, improving the service life of the heat exchange plate, and the structure is simple, and the manufacturing process is easier than the spraying technology or the spot welding distance column process; the length of the raised area can be controlled by changing the position of the end of the plate surface, and the erosion effect can be adjusted and improved according to the requirements, and there is no coverage distance limit relative to the spraying process; raising the two ends of the plate surface in the same direction can form two raised areas, and the two raised areas can be used as the inlet and outlet of the first medium flow channel, and for a multi-process first medium flow channel, the inlet and outlet are alternately arranged, and the setting of the two raised areas is equivalent to increasing the cross-sectional area of the inlet and outlet of the first medium flow channel, so that the inlet and outlet directions of the heat exchange plate do not need to be specially distinguished when assembling the heat exchanger, ensuring that the cross-sectional area of the inlet of each process of the first medium flow channel is increased, the erosion effect is reduced, and in actual use, if erosion occurs at one side of the inlet, the flow direction of the first medium can be changed as a whole, the outlet of the original first medium flow channel is used as the inlet to continue to be used, the utilization rate of the heat exchanger is improved, and the service life is improved; because the raised area is inclined, the depth of the first medium flow channel at the raised area gradually changes to the depth at the main heat exchange area, so that the flow rate of the first medium is stably changed when flowing from the inlet to the middle, the flow is more uniform, and the heat exchange effect is good; the open heat exchange plate, the heat exchange plate pair, the heat exchange plate bundle and the heat exchanger have the advantages of simple structure, convenient manufacturing process, low production cost, can effectively reduce the flow rate of the inlet section of the flow channel, slow down the erosion phenomenon, and improve the service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0018] Figure 1 It is an appearance structure schematic diagram of an open heat exchange plate in the embodiments of the present application.

[0019] Figure 2 It is a top view of an open heat exchange plate in the embodiments of the present application.

[0020] Figure 3 It is a cross-sectional structure schematic diagram of the open heat exchange plate along the A-A direction in the embodiments of the present application. Figure 2

[0021] Figure 4 It is an appearance partial structure schematic diagram of a heat exchange plate pair in the embodiments of the present application.

[0022] Figure 5 It is a cross-sectional structure schematic diagram of the heat exchange plate pair along the B-B direction in the embodiments of the present application. Figure 4

[0023] Figure 6 It is an appearance partial structure schematic diagram of a heat exchange plate bundle in the embodiments of the present application.

[0024] Figure 7 It is a cross-sectional structure schematic diagram of the heat exchange plate bundle along the C-C direction in the embodiments of the present application. Figure 6

[0025] Reference signs: 1, open heat exchange plate; 1-1, plate surface; 1-2, raised area; 1-3, main heat exchange area; 1-4, first embossed area; 1-5, second embossed area; 1-6, flow channel connecting port; 1-7, third embossed area; 1-8, protrusion; 2, heat exchange plate pair; 2-1, second medium flow channel; 3-1, first medium flow channel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with specific embodiments and with reference to the accompanying drawings.

[0027] ​​​It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be the general meanings understood by those skilled in the art to which the present disclosure belongs, unless otherwise defined. The terms "first", "second", and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0028] The plate heat exchanger is a device for transferring part of the heat of a hot fluid to a cold fluid, which is applied in the fields of chemical industry, petroleum, power, food, etc. The current plate heat exchanger can be divided into gasket type heat exchanger and welded type heat exchanger according to different sealing forms. The welded type heat exchanger adopts welding sealing between the heat exchange plates, which overcomes the gasket temperature resistance problem of the gasket type heat exchanger. The wide channel plate welded heat exchanger is suitable for heat exchange between fluids containing solid particles and fibrous impurities due to its relatively wide flow channel spacing, which maximizes the cleaning cycle of the heat exchanger, reduces the maintenance cost, and is widely used in the industries of alumina and the like.

[0029] In the field of application of alumina, a large amount of high-hardness alumina solid particles are contained in the solution, which causes serious abrasion failure of the heat exchanger, especially at the inlet section of the flow channel. The alumina solution containing high-hardness solid particles with excessively high flow rate can seriously abrade the plates, and even make the plates be abraded through. At the same time, due to the particularity of the production method, a large amount of scabs are generated during the production process, causing the flow channel to be blocked, thereby reducing the flow area of the flow channel, increasing the flow rate of the solution at the inlet section of the flow channel, further deteriorating the abrasion at the inlet section of the flow channel, and causing the heat exchanger to fail.

[0030] In order to solve the problem of inlet abrasion, a common solution is to perform local spraying on the port of the heat exchange plate to improve the abrasion resistance of the inlet of the flow channel. However, this method has high manufacturing cost and complex process, and due to the limitation of the process, the spraying coverage distance is small, and the effect of improving the abrasion is limited. Another solution is to improve the structure of the heat exchange plate, and adopt the form of flat plate spot welding distance column at the port of the heat exchange plate, so that the inlet of the flow channel is smoother. However, this method greatly reduces the heat exchange effect, the structure is more complex, the manufacturing cost is also high, and the flow rate of the inlet of the flow channel is not changed much, so the effect of improving the abrasion is limited. Therefore, there is an urgent need for a heat exchange plate with low manufacturing cost and which can effectively improve the abrasion phenomenon at the inlet of the flow channel.

[0031] Hereinafter, the technical solutions of the present application will be described in detail through specific embodiments and in conjunction with the accompanying drawings Figures 1 to 7 The technical solutions of the present application will be described in detail.

[0032] In some embodiments of the present application, an open heat exchange plate 1 is provided, as shown in Figure 1 , Figure 2 and Figure 3 , comprising: a plate surface 1-1, both ends of the plate surface 1-1 are raised in the same direction to form two raised areas 1-2, and a main heat exchange area 1-3 is formed between the two raised areas 1-2, the raised areas 1-2 are used to form the inlet and outlet of a first medium flow channel 3-1, so that the depth of the first medium flow channel 3-1 at the raised areas 1-2 is greater than the depth at the main heat exchange area 1-3.

[0033] As shown in Figure 1 , Figure 2 , the L direction is the length direction of the plate surface 1-1, the W direction is the width direction of the plate surface 1-1, the shape of the plate surface 1-1 is rectangular, the material is stainless steel for example, and the specific material is not limited, which is used for fluid heat exchange; the first medium is a fluid containing solid particles and fibrous impurities such as alumina solution, and the second medium is a fluid such as water, and the specific medium is not limited, as shown in Figure 5 and Figure 7 , the first medium flow channel 3-1 is the flow channel between the heat exchange plate pair 2, and the second medium flow channel 2-1 is the flow channel inside the heat exchange plate pair 2; as shown in Figure 2 , the dashed box on both sides of the plate surface 1-1 is the raised area 1-2, and the dashed box in the middle of the plate surface 1-1 is the main heat exchange area 1-3.

[0034] By raising the end of the plate surface 1-1, the raised area 1-2 can be formed, the raised area 1-2 is used to form the inlet and outlet of the first medium flow channel 3-1, the plate surface 1-1 that is not raised is the main heat exchange area 1-3, the main heat exchange area 1-3 is used to form the middle flow channel of the first medium flow channel 3-1, so that the depth of the first medium flow channel 3-1 at the raised area 1-2 is greater than the depth at the main heat exchange area 1-3, as shown in Figure 7 , D1 is the depth of the first medium flow channel 3-1 at the raised area 1-2, D2 is the depth of the first medium flow channel 3-1 at the main heat exchange area 1-3, D1>D2, that is, the cross-sectional area of the first medium flow channel 3-1 at the inlet section is increased, thereby reducing the flow rate of the first medium at the inlet section, thereby weakening the erosion effect of the first medium on the heat exchange plate, improving the service life of the heat exchange plate, and the structure is simple, and the manufacturing process is easier than the spraying process or the spot welding distance column process.

[0035] By changing the raised position of the end of the plate surface 1-1, the length of the raised area 1-2 can be controlled, and the erosion effect can be adjusted and improved according to the requirements, and there is no coverage distance limit compared with the spraying process.

[0036] The two raised areas 1-2 can be raised in the direction perpendicular to the plate surface 1-1, and raising both ends of the plate surface 1-1 in the same direction can form two raised areas 1-2, which can be used as the inlet and outlet of the first medium flow channel 3-1 respectively. For the multi-pass first medium flow channel 3-1, the inlet and outlet are arranged alternately, and the setting of two raised areas 1-2 is equivalent to increasing the cross-sectional area of the inlet and outlet of the first medium flow channel 3-1. Thus, when assembling the heat exchanger, the inlet / outlet orientation of the heat exchange plate does not need to be specially distinguished, ensuring that the cross-sectional area of the inlet of each pass of the first medium flow channel 3-1 is increased, reducing the influence of abrasion, and in actual use, if abrasion occurs at one side of the inlet, the flow direction of the first medium of the heat exchanger can be changed as a whole, using the outlet of the original first medium flow channel 3-1 as the inlet to continue to use, improving the utilization rate of the heat exchange plate and prolonging the service life.

[0037] As shown in Figure 3 , because the raised area 1-2 is inclined, the depth of the first medium flow channel 3-1 at the raised area 1-2 gradually changes to the depth at the main heat exchange area 1-3, so that the flow rate of the first medium is stably changed when flowing from the inlet to the middle, and the flow is more uniform, and the heat exchange effect is good.

[0038] The open-type heat exchange plate 1 has simple structure, convenient manufacturing process and low production cost, can effectively reduce the flow rate of the inlet section of the flow channel, slow down the abrasion phenomenon, and prolong the service life.

[0039] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , the raised area 1-2 is provided with a first profiling area 1-4 away from the side of the main heat exchange area 1-3, the first profiling area 1-4 is used for connecting the open-type heat exchange plates 1; the outer side of the raised area 1-2 and the main heat exchange area 1-3 is provided with a second profiling area 1-5 arranged along the length direction of the plate surface 1-1, the second profiling area 1-5 is used for connecting the open-type heat exchange plates 1; the second profiling area 1-5 is provided with a flow channel connecting port 1-6, the flow channel connecting port 1-6 is used for forming the inlet and outlet of the second medium flow channel 2-1; the edge of the plate surface 1-1 is provided with a third profiling area 1-7 arranged along the length direction, the third profiling area 1-7 is connected with the second profiling area 1-5 and is reversely arranged, and is used for connecting the heat exchange plate pairs 2.

[0040] As shown in Figure 1 and Figure 2As shown, the two short sides of the plate 1-1 are provided with a first molding area 1-4, and the two long sides of the plate 1-1 are provided with a second molding area 1-5. The two ends of each second molding area 1-5 are connected to the corresponding first molding area 1-4. A third molding area 1-7 is provided on the outside of the second molding area 1-5. A flow channel connection port 1-6 is provided on the second molding area 1-5.

[0041] The first forming zone 1-4 is an outward-facing protruding structure formed by stamping the plate surface 1-1. It is used for short-side connection between open heat exchange plates 1, such as welding, so that the two open heat exchange plates 1 of the heat exchange plate pair 2 are sealed in the width direction.

[0042] The second forming zone 1-5 is a raised structure, formed by stamping the plate surface 1-1. It is used for the long-side connection between open heat exchange plates 1, such as welding, so that only the flow channel connection port 1-6 between the two open heat exchange plates 1 of the heat exchange plate pair 2 is connected to the outside along the length direction, while other positions are closed to ensure airtightness.

[0043] The third molding zone 1-7 is a recessed structure, connected to and opposite to the second molding zone 1-5, and formed by stamping the plate surface 1-1. It is used for the long-side connection between the heat exchange plate pairs 2, such as by welding, so that the two adjacent heat exchange plate pairs 2 in the heat exchange plate bundle are sealed along the length direction.

[0044] The flow channel connection port 1-6 is a recessed structure, formed by stamping the plate surface 1-1, and is used to form the inlet and outlet of the second medium flow channel 2-1; the flow channel connection port 1-6 is located at the corner of the plate surface 1-1, which facilitates the entry of the second medium into the flow channel and fills the entire plate surface 1-1; for example Figure 1 and Figure 2 As shown in the figure, there are two flow channel connection ports 1-6, which are distributed diagonally along the plate surface 1-1 to avoid short-circuiting of fluid flow.

[0045] In some embodiments, there are two flow channel connection ports 1-6, which are located at both ends of the edge along the length direction of the plate surface 1-1, so as to facilitate changing the number of flow channels.

[0046] In some embodiments, such as Figure 2 As shown, the flow channel connection port 1-6 is located near the edge of the plate surface 1-1 along the width direction, and the distance between the flow channel connection port 1-6 and the edge is a first distance. The length of the raised area 1-2 along the length direction of the plate surface 1-1 is less than or equal to twice the first distance.

[0047] The flow channel connection port 1-6 is located near the edge of the plate surface 1-1 along the width direction, that is, near the short side of the plate surface 1-1, to reserve space for welding and assembly; such as Figure 2As shown, L1 is the distance between the flow channel connection port 1-6 and the shorter side, and L2 is the length of the raised area 1-2 along the length direction of the plate surface 1-1. The depth of the second medium flow channel 2-1 at the raised area 1-2 is low, and the flow effect is poor, and the heat exchange effect is poor accordingly. The length of the raised area 1-2 along the length direction of the plate surface 1-1 is designed to be less than or equal to twice the first distance, that is, L2≤2L1, which can avoid excessively affecting the flow cross section of the second medium and reducing the heat exchange effect, effectively improving the erosion phenomenon, and not affecting the heat exchange effect of the whole equipment, for example, L1 is 100 mm, and L2 is 100 mm or 150 mm, etc. When L2>2L1, the length of the raised area 1-2 is large, the depth of the first medium flow channel 3-1 changes relatively gently, which is not obvious for improving the erosion effect, and also excessively affects the flow cross section of the second medium flow channel 2-1, reduces the flow area of the second medium inlet section, increases the flow dead zone, and reduces the heat exchange effect.

[0048] In some embodiments, as shown in Figure 2 and Figure 3 , the minimum distance between the top surface of the first profiling area 1-4 and the plate surface 1-1 in the raised area 1-2 is greater than or equal to 1 mm, the first distance is 90 mm to 150 mm, and the length of the raised area 1-2 along the length direction of the plate surface 1-1 is 60 mm to 300 mm.

[0049] Due to the structural arrangement of the aforementioned flow channel connection port 1-6, there is a L1 length of the residence area of the second medium on the plate surface 1-1, and the heat exchange effect is poor. Therefore, the length of L1 cannot be too large, but also needs to reserve space for welding and assembly. When L1>150 mm, the heat exchange effect is poor. When L1<90 mm, it will lead to insufficient welding and assembly space.

[0050] As shown in Figure 3 , H2 is the minimum distance between the top surface of the first profiling area 1-4 and the plate surface 1-1 in the raised area 1-2, that is, the minimum depth of the heat exchange plate corrugation. As shown in Figure 5 , H2≥1 mm is designed, so that the depth of the second medium flow channel 2-1 at the first profiling area 1-4 is greater than or equal to 2 mm. In this way, the second medium can flow effectively at the first profiling area 1-4, so as not to form a complete flow dead zone, avoiding the corrosion of the second medium flow channel 2-1 caused by ion concentration due to the non-flow of the second medium. Under the working condition of the heat exchanger with high flow rate, the smaller H2 is, the more conducive to slowing down the flow rate of the first medium at the inlet, thereby improving the erosion phenomenon.

[0051] The first medium enters the plate surface 1-1 by a certain distance, and the fluid distribution can tend to be uniform, and the flow tends to be stable. When L2<60mm, the depth of the first medium flow channel 3-1 is suddenly reduced, the fluid distribution is uneven, and the heat exchange effect is poor; when L2>300mm, the depth of the first medium flow channel 3-1 changes relatively gently, which is not obvious for improving the erosion effect, and also excessively affects the flow cross section of the second medium flow channel 2-1, reduces the flow area of the second medium inlet section, increases the flow dead zone, and reduces the heat exchange effect.

[0052] The flow channel connecting port 1-6 is used to form the inlet and outlet of the second medium flow channel 2-1, and the first pressing type area 1-4 of the plate surface 1-1 is used to form the inlet and outlet of the first medium flow channel 3-1, as shown in Figure 2 L3 is the length of the flow channel connecting port 1-6, and L3 can be equal to 0.8 to 1.2 times the width of the plate surface 1-1, which can ensure that the inlet and outlet cross-sectional areas of the two medium flow channels are equivalent, the flow rates of the two fluids are basically consistent, the pressure is balanced, and the use is convenient.

[0053] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , a plurality of protrusions 1-8 are arranged on the plate surface 1-1, the protrusions 1-8 are located on the side of the plate surface 1-1 that is raised, the top surfaces of the plurality of protrusions 1-8 are in the same plane, the angle between the side surface of the protrusion 1-8 close to the main heat exchange area 1-3 and the plane where the top surface of the protrusion 1-8 is located is a first angle, the angle between the side surface of the protrusion 1-8 away from the main heat exchange area 1-3 and the plane where the top surface of the protrusion 1-8 is located is a second angle, and the first angle is greater than or equal to the second angle.

[0054] The protrusions 1-8 can be formed by stamping the plate surface 1-1, which is used to increase the fluid heat exchange area, and the heat exchange effect is higher than that of the form of flat plate spot welding distance column used in the port of the heat exchange plate; the top surface shape of the protrusion 1-8 is, for example, circular, drop-shaped or long oval, and a plurality of protrusions 1-8 can be arranged in an array, and the specific arrangement is not limited.

[0055] The top surfaces of the plurality of protrusions 1-8 are in the same plane, and when the heat exchange plate pair 2 is assembled, the protrusions 1-8 with the top surfaces in the same plane on the two open heat exchange plates 1 can be fixed by welding, which improves the structural stability, and the top surface of the protrusion 1-8 and the top surface of the first pressing type area 1-4 are in the same plane.

[0056] In the raised area 1-2, the angle between the side surface of the protrusion 1-8 close to the main heat exchange area 1-3 and the plane where the top surface of the protrusion 1-8 is located is a first angle, and the angle between the side surface of the protrusion 1-8 away from the main heat exchange area 1-3 and the plane where the top surface of the protrusion 1-8 is located is a second angle, as shown inFigure 3 As shown, within the raised area 1-2, the angles between the side surface of the protrusion 1-8 and the plane containing the top surface of the protrusion 1-8 are A1, A2-2, and A2-1. The smaller the angle, the smoother the structure of the protrusion 1-8, the less resistance to fluid flow, and the less impact of abrasion. When the angle approaches 0, the protrusion 1-8 approaches a flat plate structure, which has good anti-abrasion effect but poor heat exchange effect.

[0057] When A2-1 is the second included angle, then A2-2 and A1 are the first included angle; when A2-2 is the second included angle, then A1 is the first included angle. Because the erosion phenomenon is more severe closer to the flow channel inlet, setting the first included angle to be greater than or equal to the second included angle, i.e., A1≥A2-2≥A2-1, makes the included angle of the protrusions 1-8 closer to the inlet smaller, and the structure of protrusions 1-8 more gentle, which is more conducive to reducing the erosion phenomenon in the inlet section. On the other hand, the included angle of the protrusions 1-8 further away from the flow channel inlet is larger, and the heat exchange effect is better. Setting a gradual included angle can effectively balance the heat exchange effect and improve the erosion phenomenon.

[0058] In some embodiments, such as Figure 2 and Figure 3 As shown, the angle between the side surface of the protrusion 1-8 in the main heat exchange zone 1-3 and the plane containing the top surface of the protrusion 1-8 is the third angle, which is greater than or equal to the first angle and less than or equal to 40°.

[0059] like Figure 3 As shown, A3 is the angle between the side of the protrusion 1-8 in the main heat exchange zone 1-3 and the plane containing the top surface of the protrusion 1-8, i.e., the third angle. The third angle is greater than or equal to the first angle, i.e., A3≥A1≥A2-2≥A2-1. This has the same effect as mentioned above, which can effectively balance the heat exchange effect and improve the erosion phenomenon.

[0060] Setting A3≤40° can prevent A3 from being too large, which would cause the sides of protrusions 1-8 to be too tilted, making the main heat exchange zone more prone to erosion and scaling.

[0061] In some embodiments, such as Figure 2 and Figure 3 As shown, the length of the top surface of the protrusion 1-8 is 8mm to 20mm, the distance between two adjacent protrusions 1-8 is 30mm to 60mm, and the height of the protrusion 1-8 located in the main heat exchange zone 1-3 is 2.5mm to 7mm.

[0062] The length of the top surface of protrusion 1-8 can be the length along the length direction of board surface 1-1, or the length along the width direction of board surface 1-1, etc. Figure 2 and Figure 3As shown, the top surface of protrusion 1-8 is circular, so the length of the top surface of protrusion 1-8 is the diameter d1 of the top surface. The heat exchange plate 2 is fixed by welding the top surface of protrusion 1-8. The welding point needs to withstand pressure. Setting 8mm≤d1≤20mm can ensure the welding effect. When d1<8mm, the welding point will be subjected to large shear stress during use, which is prone to failure. When d1>20mm, it will not only reduce the welding efficiency and increase the welding cost, but also increase the ineffective area of ​​plate 1-1, affecting the heat exchange efficiency of the product.

[0063] When the top surface of protrusion 1-8 is an elongated ellipse, the maximum length of the top surface of protrusion 1-8 is the length along the length direction of board surface 1-1, that is, the length of the major axis of the ellipse, and the minimum length of the top surface of protrusion 1-8 is the length along the width direction of board surface 1-1, that is, the length of the minor axis of the ellipse. The range of the major axis length and the minor axis length is 8mm to 20mm, which is the same as the aforementioned effect, and will not be elaborated here.

[0064] The spacing between two adjacent protrusions 1-8 can be either along the length direction or along the width direction, such as... Figure 2 As shown, the protrusions 1-8 are arranged in an array, with a spacing of d2 between two adjacent protrusions 1-8. Setting d2 to 60mm ≤ d2 ≤ 30mm can ensure the pressure-bearing capacity of the heat exchanger and effectively improve the effect of erosion. When d2 < 30mm, the larger the side angle of the protrusions 1-8, the more uneven the structure of the protrusions 1-8, which is not conducive to reducing the effect of erosion. When d2 > 60mm, the larger the spacing of the welding points, the worse the pressure-bearing capacity of the heat exchanger and the shorter its service life.

[0065] like Figure 3 As shown, H1 is the height of the protrusion 1-8 located in the main heat exchange zone 1-3. Setting it to 2.5mm≤H1≤7mm can ensure the heat exchange effect and reduce the manufacturing difficulty. Under abrasive conditions, the thickness of the plate is generally 1.5mm to 2mm. When H1<2.5mm, the depth of the second medium flow channel 2-1 is low, which cannot meet the flow rate and pressure drop requirements of the second medium. When H1>7mm, it is not conducive to the stamping formation of the protrusion 1-8.

[0066] In some embodiments of this application, a heat exchanger pair 2 is provided, such as... Figure 4 and Figure 5 As shown, it includes two open heat exchange plates 1 arranged opposite to each other as described in any of the above embodiments, with the raised areas 1-2 on the two open heat exchange plates 1 respectively abutting each other, forming a second medium flow channel 2-1 between the two open heat exchange plates 1.

[0067] like Figure 4As shown in the drawings, the L direction is the length direction of the plate surface 1-1, the W direction is the width direction of the plate surface 1-1, the heat exchange plate pair 2 includes two oppositely arranged open heat exchange plates 1, the first embossed areas 1-4 of the raised areas 1-2 on the two open heat exchange plates 1 are respectively abutted, so that the short side of the heat exchange plate pair 2 is sealed, and the second medium flow channel 2-1 is formed between the two open heat exchange plates 1; the flow channel connecting ports 1-6 on the two open heat exchange plates 1 are matched to form the complete inlet and outlet of the second medium flow channel 2-1; the second embossed areas 1-5 on the two open heat exchange plates 1 are respectively abutted, so that only the flow channel connecting port 1-6 is in communication with the outside along the length direction between the two open heat exchange plates 1 of the heat exchange plate pair 2, and other positions are closed, thereby ensuring the sealing property.

[0068] As shown in the drawings, Figure 5 the depth of the second medium flow channel 2-1 at the raised area 1-2 gradually increases from 2H2 to 2H1, and the depth of the second medium flow channel 2-1 at the main heat exchange area 1-3 reaches the maximum, i.e. 2H1.

[0069] In some embodiments of the present application, a heat exchange plate bundle is provided, as shown in the drawings, Figure 6 and Figure 7 the heat exchange plate bundle includes a plurality of stacked heat exchange plate pairs 2 according to any one of the above embodiments, a first medium flow channel 3-1 is formed between adjacent two heat exchange plate pairs 2, and the raised areas 1-2 on the adjacent two heat exchange plate pairs 2 are respectively connected to form the inlet and outlet of the first medium flow channel 3-1.

[0070] As shown in the drawings, Figure 6 the L direction is the length direction of the plate surface 1-1, the W direction is the width direction of the plate surface 1-1, the heat exchange plate bundle includes a plurality of stacked heat exchange plate pairs 2, the number of which is not specifically limited, the third embossed areas 1-7 on the adjacent two heat exchange plate pairs 2 are respectively abutted, so that the long side of the heat exchange plate bundle is sealed, and the first medium flow channel 3-1 is formed between the adjacent two heat exchange plate pairs 2; the first embossed areas 1-4 on the raised areas 1-2 of the adjacent two heat exchange plate pairs 2 are matched to form the complete inlet and outlet of the first medium flow channel 3-1.

[0071] As shown in the drawings, Figure 7 the depth of the first medium flow channel 3-1 at the raised area 1-2 gradually decreases from D1 to D2, the depth of the first medium flow channel 3-1 at the main heat exchange area 1-3 reaches the minimum, i.e. D2, and D1=D2+2*(H1-H2).

[0072] In some embodiments of the present application, a heat exchanger is provided, which includes the heat exchange plate bundle according to any one of the above embodiments.

[0073] The heat exchanger has simple structure, low production cost, good anti-abrasion effect and long service life.

[0074] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to limit the scope of the application (including the claims) in any way. Indeed, those skilled in the art will recognize that many modifications, changes and variations can be made to the embodiments described above, and that such modifications, changes and variations are intended to be within the spirit and scope of the application. Accordingly, the application is not to be limited by the specific examples described above.

[0075] Further, those skilled in the art will appreciate that the description herein is provided as an enabling teaching and that various modifications and changes can be made within the scope of the application as described above and that the scope of the application should only be limited by the claims.

[0076] Although the present application has been described with respect to the embodiments, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0077] The present application is intended to cover all such alternatives, modifications and variations as falling within the scope of the appended claims. Accordingly, all such modifications and variations are intended to be included within the scope of the present application. The general scope of the application will also include any combinations of the features set forth herein.

Claims

1. An open heat exchange plate, characterized in that The plate surface has two ends which are curved in the same direction to form two curved areas, and a main heat exchange area between the two curved areas. The curved areas are used to form the inlet and outlet of a first medium flow channel, so that the depth of the first medium flow channel at the curved areas is greater than the depth at the main heat exchange area. The curved areas are arranged in an inclined manner, so that the depth of the first medium flow channel gradually changes from the curved areas to the main heat exchange area. A first pressing area is arranged on the side of the curved area away from the main heat exchange area, and is used to connect the open heat exchange plates. A second pressing area is arranged on the outer side of the curved area and the main heat exchange area along the length direction of the plate surface, and is used to connect the open heat exchange plates. A flow channel connecting port is arranged on the second pressing area, and is used to form the inlet and outlet of a second medium flow channel. A third pressing area is arranged on the edge of the plate surface along the length direction, and is connected with the second pressing area and arranged in a reverse manner, and is used to connect the heat exchange plate pairs. The flow channel connecting port is arranged close to the edge of the plate surface along the width direction, the distance between the flow channel connecting port and the edge is a first distance, and the length of the curved area along the length direction of the plate surface is less than or equal to twice the first distance. The minimum distance between the top surface of the first pressing area and the inner plate surface of the curved area is greater than or equal to 1 mm, the first distance is 90-150 mm, and the length of the curved area along the length direction of the plate surface is 60-300 mm.

2. The open heat exchange plate according to claim 1, characterized in that A plurality of protrusions are arranged on the plate surface in a spaced manner, the protrusions are located on the curved side of the plate surface, and the top surfaces of the plurality of protrusions are located on the same plane. In the curved area, the included angle between the side surface of the protrusion close to the main heat exchange area and the plane where the top surface of the protrusion is located is a first included angle, and the included angle between the side surface of the protrusion away from the main heat exchange area and the plane where the top surface of the protrusion is located is a second included angle, and the first included angle is greater than or equal to the second included angle.

3. The open heat exchange plate according to claim 1, characterized in that The included angle between the side surface of the protrusion in the main heat exchange area and the plane where the top surface of the protrusion is located is a third included angle, the third included angle is greater than or equal to the first included angle, and is less than or equal to 40°.

4. The open heat exchange plate according to claim 3, characterized in that The length of the top surface of the protrusion is 8-20 mm, the distance between adjacent two protrusions is 30-60 mm, and the height of the protrusion located in the main heat exchange area is 2.5-7 mm.

5. The open heat exchange plate according to claim 3, characterized in that The open heat exchange plate comprises two open heat exchange plates arranged in a relative manner, and the curved areas of the two open heat exchange plates are respectively abutted, so as to form a second medium flow channel between the two open heat exchange plates.

6. A heat exchange plate pair, characterized by The heat exchange plate bundle comprises a plurality of stacked heat exchange plate pairs, a first medium flow channel is formed between adjacent two heat exchange plate pairs, and the curved areas of the adjacent two heat exchange plate pairs are respectively connected, so as to form the inlet and outlet of the first medium flow channel.

7. A bundle of heat exchange plates, characterized in that The heat exchange plate bundle comprises the heat exchange plate bundle.

8. A heat exchanger, characterized by ​

Images