Plate heat exchanger

Abstract

The application provides a plate heat exchanger, comprising a plurality of first heat exchange plates and second heat exchange plates which are alternately stacked; the first heat exchange plates have first wave crests and first wave troughs, and the second heat exchange plates have second wave crests and second wave troughs; at least part of the second wave crests of the second heat exchange plates are connected with the first wave troughs corresponding to the adjacent first heat exchange plates, and at least part of the second wave troughs of the second heat exchange plates are connected with the first wave crests corresponding to the other adjacent first heat exchange plates; along the height direction of the plate heat exchanger, the maximum distance between the first wave crest and the first wave trough of the first heat exchange plate is the height h; in the direction of the shortest connecting line of the adjacent first wave crest top, the minimum connecting width of the first wave trough and the second wave crest is W1, and the minimum connecting width of the first wave crest and the second wave trough is W2, wherein at least one of the values of W1 / h and W2 / h is 0.25-2.5. The ratio of the connecting width of the crest and the trough and the wave height is 0.25-2.5, so that the connecting strength between the adjacent heat exchange plates is ensured.

Description

Technical Field

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

[0002] Stainless steel plate heat exchangers are widely used in refrigeration and heating systems as evaporators, condensers, and economizers due to their compact structure, high heat transfer coefficient, high reliability, and low refrigerant charge requirements. Plate heat exchangers consist of stacked corrugated plates; the stacked layers form two fluid channels, and heat exchange occurs through the corrugations on the plates.

[0003] Plate heat exchangers are made by stacking and welding heat exchange plates. Adjacent heat exchange plates form a network of multiple contact points, and inter-plate channels are formed between adjacent heat exchange plates to allow the medium fluid to flow and exchange heat. The connection strength of the contact points directly affects the working stability and service life of the plate heat exchanger. Therefore, it is necessary to propose a plate heat exchanger that ensures the connection strength of adjacent heat exchange plates. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a plate heat exchanger to ensure connection strength.

[0005] The present invention provides a plate heat exchanger, comprising a plurality of alternately stacked first heat exchange plates and second heat exchange plates, wherein the stacking direction of the first heat exchange plates and the second heat exchange plates is the same as the height direction of the plate heat exchanger.

[0006] The first heat exchange plate has a first corrugation, the first corrugation including a first peak and a first trough; the second heat exchange plate has a second corrugation, the second corrugation including a second peak and a second trough; at least a portion of the second peak of the second heat exchange plate is connected to the first trough corresponding to an adjacent first heat exchange plate, and at least a portion of the second trough of the second heat exchange plate is connected to the first peak corresponding to another adjacent first heat exchange plate.

[0007] Along the height direction of the plate heat exchanger, the maximum distance between the first peak and the first trough of the first heat exchange plate is the height h;

[0008] In the direction of the shortest line connecting the peaks of adjacent first wave peaks, the minimum connection width between the first wave trough and the second wave peak is W1, and the minimum connection width between the first wave peak and the second wave trough is W2, wherein at least one of the values ​​of W1 / h and W2 / h is 0.25 to 2.5.

[0009] The plate heat exchanger provided by this invention is designed with a ratio of 0.25 to 2.5 between the width of the peak and the valley of the heat exchange plate and the corrugation height, ensuring the connection strength between adjacent heat exchange plates. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the plate heat exchanger in Embodiment 1 of the present invention;

[0012] Figure 2 This is an exploded view of the plate heat exchanger in Embodiment 1 of the present invention;

[0013] Figure 3a This is a partial cross-sectional view of an adjacent first heat exchange plate and a second heat exchange plate in Embodiment 1;

[0014] Figure 3b This is another partial cross-sectional view of adjacent first and second heat exchange plates in Embodiment 1;

[0015] Figure 3c This is a partially exploded schematic diagram of adjacent first and second heat exchange plates in Embodiment 1;

[0016] Figure 3d This is a partial schematic diagram of the main view of the plate heat exchanger in Embodiment 1 of the present invention;

[0017] Figure 4a for Figure 2 An enlarged schematic diagram of part A in the middle;

[0018] Figure 4b for Figure 2 Enlarged schematic diagram of part B in the middle;

[0019] Figure 5 This is a cross-sectional view of the plate heat exchanger in Embodiment 2 of the present invention;

[0020] Figure 6 This is a partial cross-sectional view of adjacent first and second heat exchange plates in Embodiment 2 of the present invention;

[0021] Figure 7 for Figure 5 An enlarged schematic diagram of section C;

[0022] Figure 8 This is a schematic diagram of the arrangement of the second wave peak and ridge in Embodiment 1 of Embodiment 2 of the present invention;

[0023] Figure 9 This is a schematic diagram of the arrangement of the second wave peak and ridge in Embodiment 2 of the present invention;

[0024] Figure 10 This is a schematic diagram of the arrangement of the second wave peak and ridge in Embodiment 3 of Embodiment 2 of the present invention;

[0025] Figure 11 This is a partially exploded schematic diagram of adjacent first and second heat exchange plates in Embodiment 2 of the present invention;

[0026] Figure 12 This is a front view of the first heat exchange plate in Embodiment 3 of the present invention;

[0027] Figure 13 This is a front view of the second heat exchange plate in Embodiment 3 of the present invention;

[0028] Figure 14 This is a schematic diagram of the network-like contact formed by the first and second corrugations in Embodiment 3 of the present invention;

[0029] Figure 15 This is a partial schematic diagram of the first guide section in Embodiment 2 of Embodiment 3 of the present invention;

[0030] Figure 16 This is a partial schematic diagram of the second guide section in Embodiment 2 of Embodiment 3 of the present invention;

[0031] Figure 17 This is a partial schematic diagram of the first guide section in Embodiment 3 of the present invention;

[0032] Figure 18 This is a partial schematic diagram of the second guide section in Embodiment 3 of the present invention;

[0033] Figure 19 This is a schematic diagram of the structure of adjacent first and second heat exchange plates stacked in an embodiment of the present invention;

[0034] Figure 20 This is a schematic diagram of the structure of the first and second ports with gaps in an embodiment of the present invention;

[0035] Figure 21 for Figure 5 An enlarged schematic diagram of part D in the middle. Detailed Implementation

[0036] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] <Example 1>

[0039] like Figure 1 , Figure 2 , Figure 3a , Figure 3b and Figure 7 As shown, this embodiment provides a plate heat exchanger including multiple alternately stacked first heat exchange plates 10 and second heat exchange plates 20. The stacking direction of the first heat exchange plates 10 and second heat exchange plates 20 is the same as the height direction of the plate heat exchanger. The stacked heat exchange plates are formed integrally by welding (e.g., brazing). The first heat exchange plate 10 has a first corrugation 1, and the second heat exchange plate 20 has a second corrugation 2. The first corrugation 1 includes a first peak 1r and a first trough 1g, and the second corrugation 2 includes a second peak 2r and a second trough 2g. At least a portion of the second peak 2r of the second heat exchange plate 20 is in contact with the corresponding first trough 1g of an adjacent first heat exchange plate 10, and at least a portion of the second trough 2g of the second heat exchange plate 20 is in contact with the corresponding first peak 1r of another adjacent first heat exchange plate 10.

[0040] Along the height direction of the plate heat exchanger, the maximum distance between the first peak 1r and the first trough 1g of the first heat exchange plate 10 is the height h.

[0041] Specifically, at least a portion of the peak surface of the first wave 1r of the first heat exchange plate 10 is located within the first plane P1, and at least a portion of the valley surface of the first wave 1g is located within the second plane P2. The first plane P1 and the second plane P2 are parallel, and the distance (i.e., vertical distance) between the first plane P1 and the second plane P2 is the same as the height h. At least a portion of the peak surface of the second wave 2r of the second heat exchange plate 20 is located within the third plane P3, and at least a portion of the valley surface of the second wave 2g is located within the fourth plane P4. The third plane P3 and the fourth plane P4 are parallel, and the distance (i.e., vertical distance) between the third plane P3 and the fourth plane P4 is the same as the height h. The third plane P3 of the second heat exchange plate 20 coincides with the second plane P2 of the adjacent first heat exchange plate 10, and the fourth plane P4 of the second heat exchange plate 20 coincides with the first plane P1 of another adjacent first heat exchange plate 10. In this embodiment, the top surfaces of the first peak 1r of the first heat exchange plate 10 are all located in the first plane P1, the bottom surfaces of the first valley 1g are all located in the second plane P2, the top surfaces of the second peak 2r of the second heat exchange plate 20 are all located in the third plane P3, and the bottom surfaces of the second valley 2g are all located in the fourth plane P4.

[0042] In this embodiment, the stacking direction of the first heat exchange plate 10 and the second heat exchange plate 20 (e.g., Figure 1The X direction shown is perpendicular to the first plane P1, meaning the height direction of the plate heat exchanger is perpendicular to the first plane P1. In this embodiment, the stacking order of the first heat exchange plate 10 and the second heat exchange plate 20 is not specifically limited. It can be either the first heat exchange plate 10 – the second heat exchange plate 20 – the first heat exchange plate 10 stacked sequentially, or the second heat exchange plate 20 – the first heat exchange plate 10 – the second heat exchange plate 20 stacked sequentially.

[0043] Plate heat exchangers form a network of multi-point contacts through corresponding crests and troughs. During heat exchange, the medium circulates between these contacts, and the corrugations of the plates induce turbulence at lower Reynolds numbers, achieving better heat exchange performance. However, if the connection strength between adjacent heat exchange plates is weak, poor operational stability and even failure may occur. To ensure the connection strength between adjacent heat exchange plates and improve the stability of the plate heat exchanger, this embodiment designs the crests and troughs at the contact points: Please refer again. Figure 3a , Figure 3b and combined Figure 3d In the direction of the shortest line connecting the peaks of adjacent first wave peaks 1r (e.g.) Figure 3d The Y-direction shown refers to the direction perpendicular to the line connecting the peaks of the first wave 1r of the first heat exchange plate 10. The minimum contact width between the first valley 1g and the second peak 2r is W1, and the minimum contact width between the first peak 1r and the second valley 2g is W2. At least one of the values ​​of W1 / h and W2 / h is between 0.25 and 2.5. By designing the values ​​of W1 / h and / or W2 / h within the range of 0.25 to 2.5, problems such as incomplete welding or poor soldering due to insufficient contact between the peak and valley are avoided. Simultaneously, excessive contact is avoided, which would cause the solder to occupy too much of the inter-plate channel between the heat exchange plates, thus affecting the heat exchanger's heat exchange performance.

[0044] To ensure the connection width, along the shortest line connecting the peaks of adjacent first wave peaks 1r, the outer width of the valley bottom of the first wave valley 1g connecting to the second wave peak 2r is greater than or equal to W1, the outer width of the peak top of the second wave peak 2r connecting to the first wave valley 1g is greater than or equal to W1, the outer width of the peak top of the first wave peak 1r connecting to the second wave valley 2g is greater than or equal to W2, and the outer width of the valley bottom of the second wave valley 2g connecting to the first wave peak 1r is greater than or equal to W2. In this embodiment, the outer width of the valley bottom of the first wave valley 1g connecting to the second wave peak 2r can be W1 along the shortest line connecting the peaks of adjacent first wave peaks 1r, the outer width of the peak top of the second wave peak 2r connecting to the first wave valley 1g is W1, the outer width of the peak top of the first wave peak 1r connecting to the second wave valley 2g is W2, and the outer width of the valley bottom of the second wave valley 2g connecting to the first wave peak 1r is W2.

[0045] In this embodiment, along the height direction of the plate heat exchanger, the maximum distance between the second peak 2r and the second trough 2g on the second heat exchange plate 20 is also the height h. It should be understood that due to factors such as machining accuracy, assembly accuracy, and measurement errors, the distance from the first plane P1 to the second plane P2 is not absolutely equal to the height h, and a certain error is allowed, with an error range of ±0.1h. Similarly, overlapping planes are also allowed an error of ±0.1h. In this embodiment, W1 equals W2, but this is not absolutely equal; an error of ±0.3mm is allowed. Therefore, the value of W1 / h is approximately the same as the value of W2 / h. In this embodiment, h is 1-2mm. Of course, the values ​​of W1 and W2 can also be different (not shown in the figure), in which case the value of W1 / h is different from the value of W2 / h. Depending on actual needs, W1 can be greater than W2, W1 less than W2, or W1 and W2 can be the same.

[0046] Specifically, please refer to [the relevant document] again. Figure 3a , Figure 3b and combined Figure 5 The plate heat exchanger includes at least one first channel 6 and at least one second channel 7. The first channel 6 is located between the second heat exchange plate 20 and an adjacent first heat exchange plate 10, and the second channel 7 is located between the second heat exchange plate 20 and another adjacent first heat exchange plate 10. The first channels 6 are connected to each other, the second channels 7 are connected to each other, but the first channels 6 and the second channels 7 are not connected to each other. In this embodiment, the corrugations of the first heat exchange plate 10 and the second heat exchange plate 20 are symmetrically distributed, so the volumes of the first channels 6 and the second channels 7 are approximately the same (e.g., ...). Figure 3a As shown), or the first channel 6 and the second channel 7 have a large volume difference (e.g. Figure 3b (As shown).

[0047] In this embodiment, the wavelengths λ of the first peak 1r, the first trough 1g, the second peak 2r, and the second trough 2g are approximately the same, that is, the spacing between adjacent first peaks 1r, adjacent first troughs 1g, adjacent second peaks 2r, and adjacent second troughs 2g are the same. Of course, the wavelengths λ of the first trough 1g and the second peak 2r, and the wavelengths λ of the first peak 1r and the second trough 2g can also be different.

[0048] To further improve the connection strength between adjacent heat exchange plates after welding, please refer to [link / reference needed]. Figure 3cIn this embodiment, the peak of the first peak 1r, the peak of the second peak 2r, the bottom of the first valley 1g, and the bottom of the second valley 2g are all flat portions 3a. The flat portions 3a are used for the surfaces that are in contact with each other and are perpendicular to the stacking direction. In other words, the peaks of the first peak 1r and the second peak 2r are flat portions 3a, and the bottoms of the first valley 1g and the second valley 2g are flat portions 3a. During the welding process, the solder can fully contact the surfaces of the peaks and valleys and fill the spaces between the corresponding flat portions 3a, thereby increasing the contact area, reducing the problem of incomplete soldering, and further improving the welding strength.

[0049] Furthermore, in this embodiment, the first peak 1r, the second peak 2r, the first trough 1g, and the second trough 2g also include a first sidewall portion 3b and a second sidewall portion 3c. Along the shortest line connecting the peaks of adjacent first peaks 1r, one side of the straight portion 3a is connected to the first sidewall portion 3b, and the other side is connected to the second sidewall portion 3c. An included angle α is formed between the first sidewall portion 3b and the second sidewall portion 3c, where 120°≤α≤135°. In this embodiment, the first sidewall portion 3b and the second sidewall portion 3c are symmetrical about the straight portion 3a.

[0050] <Example 2>

[0051] In this embodiment, the parts that are the same as in Embodiment 1 are given the same reference numerals, and the same text descriptions are omitted.

[0052] Compared to Embodiment 1, the plate heat exchanger provided in this embodiment has the following design differences:

[0053] Please see Figure 4a , Figure 4b , Figures 5 to 7 To improve the heat exchange efficiency of the plate heat exchanger and prevent excessive pressure loss during heat transfer that could reduce its performance, this embodiment improves the design of the second corrugation 2, while the first corrugation 1 remains the same as in Embodiment 1. Specifically, the second corrugation 2 further includes at least one ridge 2a, which is distributed along the shortest line connecting the peaks of adjacent second wave peaks 2r on the second heat exchange plate 20. Along the stacking direction (i.e., along the height of the plate heat exchanger), the top of the ridge 2a is located between the peak of the second wave peak 2r and the bottom of the valley of the second wave valley 2g. Along the stacking direction, there are first channels 6 and second channels 7 on both sides of the same ridge 2a, and the volumes of the first channels 6 and the second channels 7 are different. This embodiment achieves different volumes of the inter-plate channels (along the stacking direction) on both sides of the ridge 2a by setting the ridge 2a on the second heat exchange plate 20. Of course, this embodiment can also use a design where the ridge 2a is set on the first corrugation 1 to achieve different inter-plate channel volumes, which will not be specifically described here.

[0054] This embodiment modifies only a portion of the corrugations on one of the adjacent heat exchange plates, making the height of this portion of the corrugations different from the overall corrugation height of the heat exchange plate. That is, one side of the inter-plate channel has symmetrical heat exchange plates, and the other side has asymmetrical heat exchange plates. This results in different volumes for the adjacent first channel 6 and second channel 7, minimizing pressure loss and improving the heat exchange efficiency of the plate heat exchanger. However, it does not cause an excessive volume difference between the two channels, thus not affecting heat exchange performance. During heat exchange, the medium flows through the first channel 6 and second channel 7. In the smaller inter-plate channel, the pressure drop of the medium increases, increasing turbulence and improving heat transfer within the heat exchanger, thus enhancing heat exchange performance. On the other side, due to the larger inter-plate channel volume, the pressure drop of the medium decreases significantly, reducing turbulence and allowing for the flow of high-pressure media to reduce pressure drop and improve heat exchange performance. This embodiment achieves different inter-plate channel volumes by modifying a portion of the corrugations, rather than forming several grooves on the corrugations, thus simplifying the manufacturing process.

[0055] Due to the ridge 2a, the number of contact points in the network-like multi-point contact between the heat exchange plates is reduced. To ensure the connection strength between the heat exchange plates and the welding strength of the contact peaks and troughs, at least one of the values ​​of W1 / h and W2 / h should be between 0.3 and 1, for example, values ​​of 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 1, etc. This improves the heat exchanger's heat exchange performance and efficiency while ensuring high welding strength and improving the operational stability of the plate heat exchanger. In this embodiment, the values ​​of both W1 / h and W2 / h can be selected as 0.3 to 1.

[0056] Please refer to it again. Figure 7 In this embodiment, the wavelength λ of the ridge 2a (i.e., the distance between two troughs adjacent to the ridge 2a) is approximately the same as the wavelength λ of the first peak 1r, the first trough 1g, the second peak 2r, and the second trough 2g. The top of the ridge 2a of the same second heat exchange plate 20 is approximately located within the fifth plane P5, which is located between the third plane P3 and the fourth plane P4 of the same second heat exchange plate 20. The fifth plane P5 is approximately parallel to the third plane P3. The height d of the ridge 2a is the distance from the fifth plane P5 to the fourth plane P4 of the same second heat exchange plate 20, d = (0.4~0.75)h. The height d of the ridge 2a is limited to prevent it from being too low or too high, which would affect the heat exchange performance of the heat exchanger.

[0057] Because of the ridge 2a, the first sidewall portion 3b and the second sidewall portion 3c of the second trough 2g adjacent to the ridge 2a are asymmetrical about the straight portion 3a, as shown below. Figure 11 As shown.

[0058] In this embodiment, at least one ridge 2a is provided on the second corrugation 2 at least every second wave peak 2r. The ridges 2a are distributed along the shortest line connecting the peaks of adjacent second wave peaks 2r on the second heat exchange plate 20, that is, at least one ridge 2a is provided between adjacent second wave peaks 2r, and at least one second wave peak 2r is provided between adjacent ridges 2a. For ease of understanding, examples of different implementation methods are given below:

[0059] Implementation Method 1, such as Figure 8 As shown, a ridge 2a is provided at every second wave peak 2r in the second wave 2, that is, the second wave peak 2r and the ridge 2a are arranged in sequence, and the second wave valley 2g is between adjacent second wave peaks 2r and ridges 2a.

[0060] Implementation Method 2, such as Figure 9 As shown, the second wave 2 is provided with two ridges 2a every second wave peak 2r, that is, the second wave peak 2r-ridge 2a-ridge 2a are arranged in sequence, and the second wave valley 2g is between adjacent second wave peaks 2r and ridges 2a, and between adjacent ridges 2a.

[0061] Implementation Method 3, such as Figure 10 As shown, a ridge 2a is set every two second wave peaks 2r in the second wave 2, that is, the second wave peak 2r-second wave peak 2r-ridge 2a are arranged in sequence, and the second wave valley 2g is between adjacent second wave peaks 2r and ridge 2a, and between adjacent second wave peaks 2r.

[0062] The above are just some examples of how the ridge 2a is arranged on the second corrugation 2, but it is not limited to this. Other arrangements such as second peak 2r-second peak 2r-ridge 2a-ridge 2a can also be used. The appropriate arrangement can be selected according to the heat exchange requirements.

[0063] Of course, in this embodiment, the tops of the ridges 2a of the same second heat exchange plate 20 may not be in the same plane, that is, the ridges 2a may have different heights d.

[0064] <Example 3>

[0065] In this embodiment, the parts that are the same as in Embodiments 1 and 2 are given the same reference numerals, and the same text descriptions are omitted.

[0066] Compared to Embodiments 1 and 2, the plate heat exchanger provided in this embodiment has the following additional design:

[0067] Please see Figures 12 to 14The first heat exchange plate 10 and the second heat exchange plate 20 are rectangular, each including two short sides 3d and two long sides 3e. The first corrugation 1 includes a first flow guide 4, and the second corrugation 2 includes a second flow guide 5. The angle β1 of the first flow guide 4 and the angle β2 of the second flow guide 5 are the same; the direction of the angle β1 of the first flow guide 4 is opposite to the direction of the angle β2 of the second flow guide 5. By combining the first corrugation of the first heat exchange plate 10 and the second corrugation of the second heat exchange plate 20 in opposite directions, a network-like multi-point contact is formed. Under the action of the corrugations, the fluid medium forms turbulence in the inter-plate channels at a lower Reynolds number, improving the heat transfer effect and helping to reduce fouling on the heat exchange plates.

[0068] To improve heat exchange performance, in this embodiment, the first guide section 4 and the second guide section 5 can be arranged in a V-shape, a W-shape, etc., and will be specifically described below through different implementation methods.

[0069] Implementation Method 1, please refer again Figure 12 and Figure 13 The first guide section 4 includes a first guide section 4a and a second guide section 4b, which are connected to form a V-shape and form an angle β1. The first guide section 4a and the second guide section 4b are symmetrical about the center line l, which is perpendicular to the two short sides 3d. Correspondingly, the second corrugation 2 includes a second guide section 5, which includes a third guide section 5a and a fourth guide section 5b, which are connected to form an angle β2.

[0070] Implementation Method 2, please refer to Figure 15 and Figure 16 The first guide section 4 includes two first guide sections 4a and a second guide section 4b. The first guide sections 4a and the second guide sections 4b are alternately distributed along the direction of the short side of the heat exchange plate. Adjacent first guide sections 4a and second guide sections 4b are connected and form an angle β1. The first guide sections 4a and the second guide sections 4b are symmetrical about the center line l', and the center line l' is perpendicular to the two short sides. Correspondingly, the second corrugation 2 includes a second guide section 5, which includes two third guide sections 5a and a fourth guide section 5b. The third guide sections 5a and the fourth guide sections 5b are alternately distributed along the direction of the short side of the heat exchange plate. Adjacent third guide sections 5a and the fourth guide sections 5b are connected and form an angle β2.

[0071] Implementation Method 3, please refer to Figure 17 and Figure 18 Based on Embodiment 2, this embodiment adds a second flow guiding section 4b to the first flow guiding section 4 and a fourth flow guiding section 5b to the second flow guiding section 5, so that the first flow guiding section 4 is W-shaped and the second flow guiding section 5 is W-shaped in the opposite direction.

[0072] The above are just some examples of the distribution of the flow guides, but it is not limited to these. It can also be distributed in triple V-shape or even more V-shapes, and the angle of the flow guides on the same heat exchange plate can be the same or different.

[0073] Furthermore, a large corrugation angle is selected, 90°≤β1(β2)≤135°, to improve the heat transfer coefficient and obtain more heat exchange.

[0074] Some of the technical implementation methods in Embodiments 1 to 3 described above can be combined or replaced.

[0075] Please refer to it again. Figure 12 and Figure 13 and combined Figure 19 In the above embodiment, the first heat exchange plate 10 has four first openings 8a, two of which are coplanar with the bottom of the first trough 1g of the first heat exchange plate 10, and the other two are coplanar with the top of the first peak 1r of the first heat exchange plate 10; the four first openings 8a are respectively located at the four corners of the first heat exchange plate 10; the second heat exchange plate 20 has four second openings 8b, two of which are coplanar with the top of the second peak 2r of the same second heat exchange plate 20. Within the same plane, the other two second openings 8b and the bottom of the second trough 2g of the same second heat exchange plate 20 are also within the same plane; the four second openings 8b are located at the four corners of the second heat exchange plate 20 respectively; the second openings 8b of the second heat exchange plate 20 correspond to the positions of the first openings 8a of the adjacent first heat exchange plate 10, and in the adjacent first heat exchange plate 10 and second heat exchange plate 20, two pairs of corresponding first openings 8a and second openings 8b are fitted together, and the other two pairs are spaced apart with gaps to connect the corresponding inter-plate channels. Further, the two fitted pairs of first openings 8a and second openings 8b are diagonally distributed; in other words, the first openings 8a and second openings 8b with gaps are also diagonally distributed. When the plate heat exchanger is configured for heat exchange, the medium flows into the corresponding inter-plate channel from between a pair of first openings 8a and second openings 8b with gaps, and flows out from between the diagonally spaced first openings 8a and second openings 8b. Of course, in the above embodiments, the first opening 8a and the second opening 8b with the gap can also be distributed on the same side and close to the long side.

[0076] Furthermore, to improve the structural strength of the corners of the first and second openings 8a and 8b with gaps, in the paired and spaced first and second openings 8a and 8b with gaps, the first heat exchange plate 10 is provided with a first support portion 8c at the corner of the first opening 8a, and the second heat exchange plate 20 is provided with a second support portion 8d at the corner of the second opening 8b. Both the first support portion 8c and the second support portion 8d protrude in the direction of the gap and abut against each other. By providing the first support portion 8c and the second support portion 8d, effective support is formed around the first and second openings 8a and 8b with gaps, thereby improving the structural strength. The first support portion 8c and the second support portion 8d are pressed protrusions or grooves.

[0077] Furthermore, please refer to Figure 21 In the above embodiment, the outer periphery of the first heat exchange plate 10 has a first skirt 9a, and the outer periphery of the second heat exchange plate 20 has a second skirt 9b. The first skirt 9a of the first heat exchange plate 10 and the second skirt 9b of the adjacent second heat exchange plate 20 at least partially overlap and surround the corresponding inter-plate channel. Additionally, please refer again to... Figure 1 and Figure 2 In the above embodiment, the plate heat exchanger further includes a connecting pipe 9c and a sealing element 9d. A connecting pipe 9c is connected to a first port 8a or a second port 8b on one side of the plate heat exchanger along the stacking direction, and a sealing element 9d is provided on the first port 8a or the second port 8b on the other side. That is, each port of the first heat exchange plate of the plate heat exchanger is connected to a connecting pipe 9c, and a sealing element 9d is provided to seal each port of the last heat exchange plate. The sealing element 9d can be a gasket, or the last heat exchange plate can be without a port.

[0078] The technical principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that these descriptions are merely for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments or equivalent substitutions of the present invention without creative effort, and all such embodiments will fall within the scope of protection of the present invention.

Claims

1. A plate heat exchanger, characterized in that: It includes multiple alternating stacked first heat exchange plates and second heat exchange plates, the stacking direction of the first heat exchange plates and second heat exchange plates being the same as the height direction of the plate heat exchanger; The first heat exchange plate has a first corrugation, the first corrugation including a first peak and a first trough; the second heat exchange plate has a second corrugation, the second corrugation including a second peak and a second trough; at least a portion of the second peak of the second heat exchange plate is connected to the first trough corresponding to an adjacent first heat exchange plate, and at least a portion of the second trough of the second heat exchange plate is connected to the first peak corresponding to another adjacent first heat exchange plate. Along the height direction of the plate heat exchanger, the maximum distance between the first peak and the first trough of the first heat exchange plate is the height h; In the direction of the shortest line connecting the peaks of adjacent first wave peaks, the minimum connection width between the first wave trough and the second wave peak is W1, and the minimum connection width between the first wave peak and the second wave trough is W2. Among them, at least one of the values ​​of W1 / h and W2 / h is 0.25~2.

5. The peaks of the first wave peak, the peaks of the second wave peak, the bottoms of the first wave trough and the bottoms of the second wave trough are all flat parts. The surface of the flat part used for contact is perpendicular to the height direction of the plate heat exchanger. The first peak, the second peak, the first trough, and the second trough also include a first sidewall portion and a second sidewall portion. In the direction of the shortest line connecting the peaks of adjacent first peaks, one side of the straight portion is connected to the first sidewall portion, and the other side is connected to the second sidewall portion. An included angle α is formed between the first sidewall portion and the second sidewall portion, where 120°≤α≤135°.

2. The plate heat exchanger according to claim 1, characterized in that: Along the height direction of the plate heat exchanger, the maximum distance between the second peak and the second trough of the second heat exchange plate is the height h; In the direction of the shortest line connecting the peaks of adjacent first wave peaks, the outer width of the valley bottom of the first wave valley connected to the second wave peak is greater than or equal to W1, the outer width of the peak top of the second wave peak connected to the first wave valley is greater than or equal to W1, the outer width of the peak top of the first wave peak connected to the second wave valley is greater than or equal to W2, and the outer width of the valley bottom of the second wave valley connected to the first wave peak is greater than or equal to W2. At least one of the values ​​of W1 / h and W2 / h is 0.3 to 1.

3. The plate heat exchanger according to claim 2, characterized in that: In the direction of the shortest line connecting the peaks of adjacent first wave peaks, the outer width of the valley bottom of the first wave valley connected to the second wave peak is W1, the outer width of the peak of the second wave peak connected to the first wave valley is W1, the outer width of the peak of the first wave peak connected to the second wave valley is W2, and the outer width of the valley bottom of the second wave valley connected to the first wave peak is W2. W1 is the same as W2.

4. The plate heat exchanger according to claim 1, characterized in that: The first heat exchange plate has at least a portion of the peak surface of the first wave located within the first plane P1, and at least a portion of the valley surface of the first wave located within the second plane P2. The first plane P1 and the second plane P2 are parallel, and the distance from the first plane P1 to the second plane P2 is the same as the height h. The second heat exchange plate has at least a portion of the peak surface of the second wave located within the third plane P3, and at least a portion of the valley surface of the second wave located within the fourth plane P4. The third plane P3 and the fourth plane P4 are parallel, and the distance between the third plane P3 and the fourth plane P4 is the same as the height h. The third plane P3 of the second heat exchange plate coincides with the second plane P2 of the adjacent first heat exchange plate, and the fourth plane P4 of the second heat exchange plate coincides with the first plane P1 of another adjacent first heat exchange plate. The height direction of the plate heat exchanger is perpendicular to the first plane P1.

5. The plate heat exchanger according to any one of claims 1 to 4, characterized in that: The second corrugation also includes at least one ridge, which is distributed along the shortest line connecting the peaks of adjacent second corrugations of the second heat exchange plate. Along the height direction of the plate heat exchanger, the top of the ridge is located between the peak of the second wave and the bottom of the second wave; along the height direction of the plate heat exchanger, the volume of the interplate channel on both sides of the ridge is different. The top of the ridge of the second heat exchange plate is located within the fifth plane P5, which is located between the third plane P3 and the fourth plane P4 of the same second heat exchange plate. The fifth plane P5 is parallel to the third plane P3, and the height d of the ridge is the distance from the fifth plane P5 to the fourth plane P4. ; The value of h is 1~2 mm.

6. The plate heat exchanger according to claim 5, characterized in that: At least one ridge is provided between adjacent second peaks, and at least one second peak is provided between adjacent ridges; The plate heat exchanger includes at least one first channel and at least one second channel. The first channel is located between the second heat exchange plate and an adjacent first heat exchange plate, and the second channel is located between the second heat exchange plate and another adjacent first heat exchange plate. The same ridge has a first channel and a second channel on both sides along the height direction of the plate heat exchanger, and the first channel and the second channel have different volumes. The first channels are connected to each other, the second channels are connected to each other, and the first channels and the second channels are not connected to each other.

7. The plate heat exchanger according to any one of claims 1 to 4, characterized in that: The first heat exchange plate and the second heat exchange plate each include two short sides and two long sides. The first corrugation includes a first flow guide. The first flow guide includes at least one first flow guide section and at least one second flow guide section. Adjacent first flow guide sections and second flow guide sections are connected and form an angle β1, 90°≤β1≤135°. The first and second guide sections about the center line l Symmetry, the center line l Perpendicular to the two shorter sides; The second corrugation includes a second guide section, which includes at least one third guide section and at least one fourth guide section. Adjacent third and fourth guide sections are connected and form an angle β2, where 90°≤β2≤135°. The angle β1 of the first guide section is the same as the angle β2 of the second guide section; the direction of the angle β1 of the first guide section is opposite to the direction of the angle β2 of the second guide section.

8. The plate heat exchanger according to any one of claims 1 to 4, characterized in that: The first heat exchange plate has four first openings, two of which are in the same plane as the bottom of the first trough of the same first heat exchange plate, and the other two are in the same plane as the top of the first peak of the same first heat exchange plate. The four first ports are located at the four corners of the first heat exchange plate; The second heat exchange plate has four second openings, two of which are in the same plane as the top of the second peak of the same second heat exchange plate, and the other two are in the same plane as the bottom of the second trough of the same second heat exchange plate. The four second ports are located at the four corners of the second heat exchange plate; The second opening of the second heat exchange plate corresponds to the position of the first opening of the adjacent first heat exchange plate; In adjacent first and second heat exchange plates, there are two pairs of corresponding first and second openings that fit together, and the other two pairs are spaced apart. The two pairs of first and second openings that fit together are diagonally distributed.

9. The plate heat exchanger according to claim 8, characterized in that: In a first port and a second port with a gap, the first heat exchange plate is provided with a first support part at the corner where the first port is located, and the second heat exchange plate is provided with a second support part at the corner where the second port is located. Both the first support part and the second support part protrude in the direction of the gap and abut against each other. The first heat exchange plate has a first skirt on its outer periphery, and the second heat exchange plate has a second skirt on its outer periphery. The first skirt of the first heat exchange plate and the second skirt of the adjacent second heat exchange plate at least partially overlap to surround the corresponding inter-plate channel. The plate heat exchanger also includes connecting pipes and sealing components. A connecting pipe is connected to a first or second port on one side of the plate heat exchanger along the height direction, and a sealing component is provided at the first or second port on the other side.

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