A plate heat exchanger

Abstract

The application discloses a plate heat exchanger, which comprises a heat exchange array; the heat exchange plate is composed of two plate bodies, shallow grooves are punched on the inner side of the plate bodies; ring grooves are punched on the outer side of the shallow grooves; open grooves are pressed on the outer side of the plate bodies; the open grooves of the two plate bodies are attached and integrally sealed and welded; the open grooves protrude from the bottom surface of the shallow grooves; corrugated surfaces are punched on the two sides of the bottom of the shallow grooves; flow guide portions are punched on the inner side of the shallow grooves; the two flow guide portions are attached to each other and are sealed and welded; through-flow ports are formed in the inner side of the flow guide portions; the flow guide portions are flush with the bottom surface of the open grooves at one end of the through-flow ports; flow guide portions are welded at the diagonal positions of the flow guide portions, and the top of the flow guide portions is flush with the top of the ring grooves; the plate heat exchanger can set a closed flow channel for the medium to be protected, and can ensure that the medium does not leak or pollute another medium when flowing.

Description

Technical Field

[0001] This invention relates to a heat exchanger, specifically a plate heat exchanger, and belongs to the field of heat exchanger technology. Background Technology

[0002] Plate heat exchangers are widely used devices for liquid-liquid and liquid-vapor heat exchange. A plate heat exchanger is generally composed of several corrugated metal plates stacked together, forming thin rectangular channels through which heat exchange occurs. The structure and heat exchange principle of plate heat exchangers result in features such as compact structure, small footprint, high heat transfer efficiency, high operational flexibility, wide applicability, and low heat loss. Existing plate heat exchangers are sealed using sealing strips. After the metal plates are bonded together, the sealing strips press against each other to seal. The sealing performance is determined by the pressure between the metal plates. During use, if the pressure between the metal plates is insufficient, or if the metal plates deform due to heat or mechanical impact, or if the sealing strips are corroded by corrosive media, the two media can easily mix, leading to contamination. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a plate heat exchanger that can provide a closed flow channel for the medium that needs protection, ensuring that leakage or contamination of another medium does not occur during the flow of the medium.

[0004] The plate heat exchanger of the present invention includes

[0005] A heat exchange array is formed by pressing multiple heat exchange plates together in sequence. The heat exchange plate at the first end is provided with a heat medium inlet and a heat exchange outlet; the heat exchange plate at the last end is provided with a heat medium outlet and a heat exchange inlet. The heat medium is introduced into the heat exchange array through the heat medium inlet and discharged from the heat exchange array through the heat medium outlet after heat exchange is completed. The cold medium enters the heat exchange array through the heat exchange inlet, absorbs heat, and is discharged through the heat exchange outlet. The heat medium and the cold medium complete the heat exchange in a counter-current heat exchange manner.

[0006] The heat exchange plate is composed of two plates. A shallow groove is stamped on the inner side of each plate. An annular groove is stamped on the outer edge of the shallow groove. An open groove is pressed on the outer edge of the plate. The open grooves of the two plates are joined together and sealed by welding. The open groove protrudes from the bottom surface of the shallow groove. The bottom of the shallow groove is stamped with corrugated surfaces on both sides. A flow guide is stamped on the inner side of the shallow groove. Two flow guides are joined together and sealed by welding. A flow through-hole is opened on the inner side of the flow guide. One end of the flow guide is flush with the bottom surface of the open groove. A flow drain is welded to the shallow groove at a diagonal position of the flow guide, the top of which is flush with the top of the annular groove. The flow drains welded to both sides of the same heat exchange plate are respectively concave and convex cavity structures that can be interlocked. Multiple sealing rings are fitted around the flow drain of the convex cavity structure.

[0007] The two plates are sealed and welded together, forming internal flow channels within each plate. The heat exchange medium enters the internal flow channels through the guide sections and flows into the next internal flow channel through diagonally opposite guide sections. An external flow channel is formed between the two sets of heat exchange plates. When the external and internal flow channels exchange heat, plate heat exchange (i.e., surface heat exchange) is still used. When adjacent external flow channels flow, flow is achieved through guide sections. Both guide sections are stamped and finally assembled by surface-fitting (interference fit) welding, ensuring a tight weld seal. After welding, secondary sealing and flow guidance are achieved by setting guide sleeves or guide nozzles. The external flow channel undergoes secondary heat exchange when passing through the internal flow channel before entering the next external flow channel. The guide section adopts an inwardly concave, integrally stamped structure, while the guide section adopts an outwardly convex, welded structure. The two transition flow channels are completely separated, and the internal flow channel is not subject to compression or end deformation that could lead to media leakage. The external flow channel is sealed using a sealing strip pressing method, achieving rapid pressing assembly.

[0008] An outer sealing strip is fixed inside the annular groove and protrudes from the outer end face of the annular groove; the outer sealing strip seals the annular groove according to the external flow channel structure provided by the annular groove.

[0009] Inner sealing strip; the inner sealing strip is embedded between the annular groove and the open groove; and one end of the inner sealing strip is attached to the annular groove, while the other end does not protrude from the end face of the shallow groove;

[0010] The outer sealing strips of the heat exchange plates in adjacent groups are pressed together, and the drainage parts are interlocked.

[0011] Furthermore, inner guide sleeves are provided on the inner sides of the two opposing flow guides by means of screwing, riveting and / or welding; the inner guide sleeves pass through the flow inlet, the outer wall of the inner guide sleeves fits against the inner edge of the flow inlet, and the outer edges of both ends of the inner guide sleeves are sealed and welded to the plate body.

[0012] Furthermore, two interlocking flow nozzles are provided on the inner sides of the two opposing flow inlets. The flow nozzles are first interlocked with the flow inlets and then integrally sealed and welded. After the welding is completed, the two interlocking flow nozzles are integrally interlocked to form a flow channel.

[0013] Furthermore, multiple inner ridges are welded at intervals on the outer side of the shallow groove, and the other side of the inner ridges is pressed onto the other plate surface of the heat exchange plate; the inner ridges of the two plates are arranged intersectingly, and the inner ridges serve as both flow channels and welding supports between the two plates.

[0014] Furthermore, the flow-guiding portions of adjacent heat exchange plates are arranged diagonally, and the flow-directing portions of adjacent heat exchange plates are arranged diagonally. By arranging them diagonally, the plate-side heat exchange of the two media can be maximized.

[0015] Furthermore, the heat exchange plate manufacturing process is as follows: First, the entire plate body is stamped. After stamping, the flow inlet is welded first, followed by the flow guide. After welding, a sealing and water-tight pressure test is conducted to confirm whether there is any leakage in the heat exchange plate weld, the flow inlet weld, and the flow guide weld. After confirming that there is no leakage, adjacent heat exchange plates are pressed together, and the flow inlet is aligned and fitted. Finally, an overall water-tight pressure test is conducted.

[0016] Furthermore, when the heat exchange array is in use, the flow medium in the drainage section is a medium that needs protection, such as a high-cost medium, a polluting or easily polluted medium, a medium that easily vaporizes, or a medium that reacts with another heat exchange medium. Through a highly sealed flow channel, adjacent substances can be prevented from being contaminated.

[0017] Compared with the prior art, the plate heat exchanger of the present invention can set up a closed flow channel for the medium that needs to be protected, so as to ensure that the medium will not leak or contaminate the other medium when it flows. The flow channel can be manufactured into an ultra-thin structure or made into a certain flow width according to the needs, and the flow pressure values ​​of the two media can be adjusted according to the heat exchange requirements (determined by the depth of the shallow groove and the open groove). Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 For the present invention Figure 1 A magnified view of the overall structure at point A.

[0020] Figure 3 This is a schematic diagram of the plate body structure after stamping according to the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the present invention before the two plates are installed.

[0022] Figure 5 This is a partial structural diagram of the heat exchange plate of the present invention.

[0023] Figure 6 This is a schematic diagram of the installation structure of the drainage part and sealing ring of the present invention.

[0024] Figure 7 This is a schematic diagram of the inner surface structure of the heat exchange plate of the present invention.

[0025] Figure 8 This is a schematic diagram of the outer surface structure of the heat exchange plate of the present invention.

[0026] Figure 9 This is a schematic diagram of the installation structure of the flow guide and inner guide sleeve of the present invention.

[0027] Figure 10This is a schematic diagram of the installation structure of the flow nozzle and inner guide sleeve of the present invention. Detailed Implementation

[0028] Example 1:

[0029] like Figures 1 to 9 The plate heat exchanger shown includes

[0030] A heat exchange array is formed by pressing multiple heat exchange plates 1 together in sequence. The heat exchange plate 1 at the first end is provided with a heat medium inlet 2 and a heat exchange outlet 3. The heat exchange plate 1 at the last end is provided with a heat medium outlet 4 and a heat exchange inlet 5. The heat medium is introduced into the heat exchange array through the heat medium inlet and discharged from the heat exchange array through the heat medium outlet after heat exchange is completed. The cold medium enters the heat exchange array through the heat exchange inlet, absorbs heat, and is discharged through the heat exchange outlet. The heat medium and the cold medium complete the heat exchange in a counter-current heat exchange manner.

[0031] The heat exchange plate 1 is composed of two plates. A shallow groove 6 is formed by stamping the inner side of the plates. An annular groove 7 is stamped on the outer edge of the shallow groove 6. An open groove 8 is pressed on the outer edge of the plates. The open grooves 8 of the two plates are attached together and sealed by welding. The open groove 8 protrudes from the bottom surface of the shallow groove 6. The bottom two sides of the shallow groove 6 are stamped with corrugated surfaces 9. A flow guide 10 is stamped on the inner side of the shallow groove 6. The two flow guides 10 are attached together and sealed by welding. A flow through-hole 11 is opened on the inner side of the flow guide 10. One end of the flow guide 10 is flush with the bottom surface of the open groove 8. A flow guide 13 is welded to the shallow groove 6 at the diagonal position of the flow guide. The top of the flow guide 13 is flush with the top of the annular groove. The flow guides welded to the two sides of the same heat exchange plate 1 are respectively concave cavity and convex cavity structures that can be interlocked. The flow guide of the convex cavity structure is surrounded by multiple sealing rings 14.

[0032] The two plates are sealed and welded together, forming internal flow channels within each plate. The heat exchange medium enters the internal flow channels through the guide sections and flows into the next internal flow channel through diagonally opposite guide sections. An external flow channel is formed between the two sets of heat exchange plates. When the external and internal flow channels exchange heat, plate heat exchange (i.e., surface heat exchange) is still used. When adjacent external flow channels flow, flow is achieved through guide sections. Both guide sections are stamped and finally assembled by surface-fitting (interference fit) welding, ensuring a tight weld seal. After welding, secondary sealing and flow guidance are achieved by setting guide sleeves or guide nozzles. The external flow channel undergoes secondary heat exchange when passing through the internal flow channel before entering the next external flow channel. The guide section adopts an inwardly concave, integrally stamped structure, while the guide section adopts an outwardly convex, welded structure. The two transition flow channels are completely separated, and the internal flow channel is not subject to compression or end deformation that could lead to media leakage. The external flow channel is sealed using a sealing strip pressing method, achieving rapid pressing assembly.

[0033] An outer sealing strip 15 is fixed inside the annular groove 7 and protrudes from the outer end face of the annular groove 7; the outer sealing strip seals the annular groove according to the external flow channel structure provided by the annular groove.

[0034] Inner sealing strip 16; the inner sealing strip 16 is embedded between the annular groove 7 and the open groove 8; and one end of the inner sealing strip 16 is attached to the annular groove 7, while the other end does not protrude from the end face of the shallow groove 6.

[0035] The outer sealing strips of the heat exchange plates 1 in adjacent groups are pressed together, and the drainage parts 13 are interlocked.

[0036] In another embodiment, such as Figure 10 As shown, two inner guide sleeves 17 are provided on the inner sides of the flow guide 10 by means of screwing, riveting and / or welding; the inner guide sleeve passes through the flow port, the outer wall of the inner guide sleeve is in contact with the inner edge of the flow port, and the outer edges of both ends of the inner guide sleeve are sealed and welded to the plate.

[0037] In another embodiment, such as Figure 10 As shown, two interlocking flow nozzles 18 are provided on the inner sides of the two flow inlets 11. The flow nozzles 18 are first interlocked with the flow inlets and then integrally sealed and welded with them. After the welding is completed, the two interlocking flow nozzles are integrally interlocked to form a flow channel.

[0038] Multiple inner ribs 12 are welded at intervals on the outer side of the shallow groove 6, and the other side of the inner ribs 12 is pressed onto the other plate surface of the heat exchange plate 1; the inner ribs 12 of the two plates are arranged intersectingly, and the inner ribs serve as both flow channels and welding supports between the two plates.

[0039] The flow-guiding portions 13 of adjacent heat exchange plates 1 are arranged diagonally, and the flow-guiding portions 10 of adjacent heat exchange plates 1 are arranged diagonally. By arranging them diagonally, the heat exchange between the two media can be maximized.

[0040] The heat exchange plate manufacturing process is as follows: First, the entire plate body is stamped. After stamping, the flow inlet is welded first, followed by the flow guide. After welding, a sealing and water-tight pressure test is conducted to confirm whether there is any leakage in the heat exchange plate weld, the flow inlet weld, and the flow guide weld. After confirming that there is no leakage, the adjacent heat exchange plates are pressed together, and the flow inlet is aligned and fitted. Finally, an overall water-tight pressure test is conducted.

[0041] When the heat exchange array is in use, the flow medium in the drainage section is a medium that needs to be protected, such as a high-cost medium, a polluting or easily contaminated medium, a medium that is easily vaporized, or a medium that will react with another heat exchange medium. Through a highly sealed flow channel, adjacent substances can be prevented from being contaminated.

[0042] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the scope of this patent application.

Claims

1. A plate heat exchanger, characterized in that: include A heat exchange array; the heat exchange array is composed of multiple sets of heat exchange plates pressed together in sequence, with a heat medium inlet and a heat exchange outlet provided on the heat exchange plate at the first end; and a heat medium outlet and a heat exchange inlet provided on the heat exchange plate at the last end. The heat exchange plate is composed of two plates. A shallow groove is stamped on the inner side of each plate. An annular groove is stamped on the outer edge of the shallow groove. An open groove is pressed on the outer edge of the plate. The open grooves of the two plates are joined together and sealed by welding. The open groove protrudes from the bottom surface of the shallow groove. The bottom of the shallow groove is stamped with corrugated surfaces on both sides. A flow guide is stamped on the inner side of the shallow groove. Two flow guides are joined together and sealed by welding. A flow through-hole is opened on the inner side of the flow guide. One end of the flow guide is flush with the bottom surface of the open groove. A flow drain is welded to the shallow groove at a diagonal position of the flow guide, the top of which is flush with the top of the annular groove. The flow drains welded to both sides of the same heat exchange plate are respectively concave and convex cavity structures that can be interlocked. Multiple sealing rings are fitted around the flow drain of the convex cavity structure. An outer sealing strip is fixed inside the annular groove and protrudes from the outer end face of the annular groove. Inner sealing strip; the inner sealing strip is embedded between the annular groove and the open groove; and one end of the inner sealing strip is attached to the annular groove, while the other end does not protrude from the end face of the shallow groove; The outer sealing strips of the heat exchange plates in adjacent groups are pressed together, and the drainage parts are interlocked.

2. The plate heat exchanger according to claim 1, characterized in that: Two inner guide sleeves are provided on the inner sides of the two flow guides by means of screwing, riveting or welding; the inner guide sleeves pass through the flow inlet.

3. The plate heat exchanger according to claim 1, characterized in that: Two interlocking flow nozzles are provided on the inner sides of the two flow inlets facing each other.

4. The plate heat exchanger according to claim 1, characterized in that: Multiple inner ridges are welded at intervals on the outer side of the shallow groove, and the other side of the inner ridges is pressed onto the other plate surface of the heat exchange plate; the inner ridges of the two plates are arranged intersectingly.

5. The plate heat exchanger according to claim 1, characterized in that: The flow-guiding portions of adjacent heat exchange plates are arranged diagonally.

6. The plate heat exchanger according to claim 1, characterized in that: The heat exchange plate manufacturing process is as follows: First, the entire plate body is stamped. After stamping, the flow inlet is welded first, followed by the flow guide. After welding, a sealing and water-tight pressure test is conducted to confirm whether there is any leakage in the heat exchange plate weld, the flow inlet weld, and the flow guide weld. After confirming that there is no leakage, the adjacent heat exchange plates are pressed together, and the flow inlet is aligned and fitted. Finally, an overall water-tight pressure test is conducted.

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