A large plate heat exchanger with large temperature difference and small end difference

Abstract

The present invention discloses a large plate heat exchanger with large temperature difference and small end difference, and relates to the field of plate heat exchangers. The heat exchanger includes a frame formed by a fixed clamping plate, a bracket, an upper guide rod and a lower guide rod, a movable clamping plate is arranged in the frame, a plurality of plates are arranged between the fixed clamping plate and the movable clamping plate, and the upper and lower ends of the movable clamping plate and the plate are slidably connected with the upper guide rod and the lower guide rod, and the upper guide rod includes a support part and a guide part from top to bottom in sequence, and the movable clamping plate and the plate are respectively matched with the guide part to achieve sliding connection. The right end face of the guide part is located on the left side of the right end face of the support part, and the right end of the support part is fixedly connected with the upper end face of the bracket. The heat exchanger adopts a large aspect ratio, which can achieve a large temperature difference and a small end difference; the reinforced upper guide rod can ensure that the equipment is hung with the plates with the maximum installed area and always ensure safe disturbance and load bearing, while occupying a small space.

Description

Technical Field

[0001] The invention relates to the field of plate heat exchangers, in particular to a large plate heat exchanger with large temperature difference and small end difference. Background Art

[0002] At present, in order to supply heat over long distances and reduce water pump investment and electricity consumption, the domestic first-station heating adopts a large temperature difference and small end difference design. At the same time, the pressure is relatively high, which requires the plate heat exchanger to have a large length-to-width ratio, a large heat exchange area, and a high pressure-bearing equipment to be able to operate safely and stably for a long time.

[0003] Plate heat exchangers are widely used in energy, power, heating, refrigeration and other fields due to their high heat exchange efficiency and compact structure. In some fields, they have replaced traditional shell and tube heat exchangers. However, existing plate heat exchangers generally have small assembly area and small aspect ratio, which cannot meet the design requirements of large temperature difference and small end difference. In order to meet the design requirements of large temperature difference and small end difference, it is necessary to increase the aspect ratio and heat exchange area of ​​the plate, which will inevitably increase the volume of the entire heat exchanger. After the large-scale, the upper guide rod of the traditional plate heat exchanger is not strong enough, which is prone to problems in structural strength and other aspects. Summary of the invention

[0004] In view of the above problems, the present invention provides a large plate heat exchanger with large temperature difference and small end difference. The large plate heat exchanger adopts a large aspect ratio and a single plate heat exchange area of ​​3m 2 The above ensures that a large temperature difference and a small end difference can be achieved; the reinforced upper guide rod and the special structure can ensure that the equipment can hang the maximum installed area plate and always ensure safe interference and load bearing, while occupying a small space.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A large plate heat exchanger with large temperature difference and small end difference, comprising a frame formed by a fixed clamping plate, a bracket, an upper guide rod and a lower guide rod, wherein a movable clamping plate is arranged in the frame, a plurality of plates are arranged between the fixed clamping plate and the movable clamping plate, and the upper and lower ends of the movable clamping plate and the plates are slidably connected with the upper guide rod and the lower guide rod, wherein the upper guide rod comprises a supporting part and a guiding part in sequence from top to bottom, and the movable clamping plate and the plates are respectively matched with the guiding parts to realize sliding connection;

[0007] The right end surface of the guide portion is located on the left side of the right end surface of the support portion, and the lower side surface of the right end of the support portion is pressed against the upper end surface of the bracket and fixedly connected to the upper end surface of the bracket.

[0008] Furthermore, the left end of the upper guide rod is fixedly connected to the fixed clamping plate through a blocking block, and a protrusion is provided on the blocking block above the fixed clamping plate, and the lower side surface of the protrusion is pressed against the upper end surface of the fixed clamping plate.

[0009] Furthermore, the blocking block includes, from top to bottom, a connecting portion and a guide avoidance portion whose shape matches the cross-sectional shape of the guide portion, and the left end surface of the guide portion is flush with the left end surface of the support portion.

[0010] Furthermore, the lower end surface of the blocking block is flush with the lower side surface of the supporting portion, and the left end surface of the guiding portion is flush with the left end surface of the blocking block.

[0011] Furthermore, a relief notch is provided at the right end of the guide portion, and the plate can be inserted into the guide portion of the upper guide rod through the relief notch.

[0012] Furthermore, the cross-section of the guide portion is an inverted T-shaped structure, a groove is provided on the lower side of the support portion, the suspended end of the vertical portion of the guide portion is inserted into the groove, and is fixedly connected to the support portion by welding.

[0013] Furthermore, the cross section of the support portion is in an "I" shape, and a plurality of reinforcing rib plates are arranged between the upper horizontal plate and the lower horizontal plate of the support portion at the front and rear sides of the vertical plate.

[0014] Furthermore, the aspect ratio of the plate is greater than or equal to 3.6:1, and the heat exchange area of ​​a single plate is greater than or equal to 3m 2 .

[0015] Furthermore, the depth of the flow channel groove on the plate is between 2.6 mm and 3 mm.

[0016] The beneficial effects of the present invention are:

[0017] 1. The reinforced upper guide rod adopts a special design to reduce the height, thereby reducing the height of the entire heat exchanger, which facilitates the installation and layout of large heat exchangers. At the same time, the left end of the reinforced upper guide rod is overlapped with the fixed clamping plate through a block, and the upper part of the right end is directly overlapped vertically on the bracket, which reduces and avoids the problem of traditional design requiring side connection with bolts, the bolts are subjected to huge shear stress, and the connection strength is unreliable.

[0018] 2. The plate adopts a large aspect ratio and a large single plate area, which ensures sufficient heat exchange flow channel length and heat exchange area, and realizes large temperature difference and small end difference heat exchange.

[0019] 3. By setting an avoidance notch on the guide part at the lower end of the upper guide rod, the plate can be installed and removed without removing the upper guide rod, which is convenient for future equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a large plate heat exchanger with large temperature difference and small end difference;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0022] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of part B;

[0023] Figure 4 for Figure 1 A schematic diagram of the enlarged structure of the middle C part;

[0024] Figure 5 Schematic diagram of the structure of the upper guide rod;

[0025] Figure 6 for Figure 5 AA section view in;

[0026] Figure 7 It is the left view of the upper guide rod;

[0027] Figure 8 for Figure 5 A local schematic diagram in the direction of FIG.

[0028] Fig. 9 It is a schematic diagram of the connection structure between the plate and the lower guide rod;

[0029] Fig.10 It is a schematic diagram of the structure of a traditional plate heat exchanger;

[0030] Fig.11 for Fig.10 A schematic diagram of the enlarged structure of the D part;

[0031] Fig.12 for Fig.10 A schematic diagram of the enlarged structure of part E in the middle;

[0032] Fig.13 for Fig.10 BB section view in.

[0033] In the figure: 1-fixed clamping plate, 2-plate, 3-upper guide rod, 31-support part, 311-upper horizontal plate, 312-lower horizontal plate, 313-vertical plate, 32-guide part, 321-horizontal part, 3211-avoidance gap, 322-vertical part, 33-block, 331-connecting part, 332-guide avoidance part, 333-protrusion, 34-end plate, 4-movable clamping plate, 5-bracket, 6-lower guide rod, 7-clamping bolt. DETAILED DESCRIPTION

[0034] For the convenience of description, the coordinate system is defined as Figure 1 As shown, the left-right direction is the horizontal direction, the up-down direction is the vertical direction, and the front-back direction is the longitudinal direction.

[0035] like Figure 1 As shown, a large plate heat exchanger with large temperature difference and small end difference includes a fixed clamping plate 1 and a bracket 5, and the upper end and the lower end of the fixed clamping plate 1 are fixedly connected to the bracket 5 through an upper guide rod 3 and a lower guide rod 6 respectively. The fixed clamping plate 1, the upper guide rod 3, the lower guide rod 6 and the bracket 5 together form a rigid frame. A plurality of plates 2 are arranged in the frame along the left and right directions, the upper end of the plate 2 is slidably connected to the upper guide rod 3, and the lower end of the plate 2 is slidably connected to the lower guide rod 6. A rubber pad for sealing is arranged between two adjacent plates 2 (not shown in the figure). A movable clamping plate 4 slidably connected to the frame is arranged on the right side of the plate 2 located on the far right, the upper end of the movable clamping plate 4 is slidably connected to the upper guide rod 3, and the lower end of the movable clamping plate 4 is slidably connected to the lower guide rod 6. A clamping bolt 7 is provided between the fixed clamping plate 1 and the movable clamping plate 4, and the fixed clamping plate 1, the plate 2 and the movable clamping plate 4 are pressed against each other under the tensioning action of the clamping bolt 7 to form a sealed heat exchange flow channel.

[0036] The aspect ratio of the plate 2 is greater than or equal to 3.6:1, and the heat exchange area of ​​a single plate is greater than or equal to 3m 2 In this way, sufficient heat exchange channel length and heat exchange area can be ensured to achieve large temperature difference and small end difference heat exchange. In addition, to achieve the design requirements of large temperature difference and small end difference, the flow rate of the heat exchange medium needs to be faster. For this reason, the depth of the flow channel groove on the plate is between 2.6mm-3mm.

[0037] like Fig.10 and Fig.13 As shown, the upper guide rod 3 of the traditional plate heat exchanger is only made of a simple I-beam support. Although this is simple to process, it is not enough to meet the design requirements of large temperature difference and small end difference for large plate heat exchangers. In order to improve the bearing capacity, if the model of the I-beam is simply increased, since the I-beam is a mass-produced profile and not a customized product, increasing its model will inevitably increase the height of the upper guide rod 3, and this height can only be passively accepted.

[0038] In addition, if Fig.10 , Fig.11 and Fig.12 As shown, the left and right ends of the conventional upper guide rod 3 are connected by bolts at the sides, the bolts are subjected to huge shear stress, and the connection strength is unreliable.

[0039] For this reason, Figure 5 and Figure 6 As shown, the upper guide rod 3 described in this embodiment includes a support portion 31 and a guide portion 32 from top to bottom. The support portion 31 includes an upper transverse plate 311, a lower transverse plate 312 and a vertical plate 313 for connecting the upper transverse plate 311 and the lower transverse plate 312, and the upper transverse plate 311, the lower transverse plate 312 and the vertical plate 313 together form an "I"-shaped structure. The cross section of the guide portion 32 is an inverted T-shaped structure, including a vertical portion 322 and a horizontal portion 321, and the suspended end of the vertical portion 322 of the guide portion 32 is fixedly connected to the lower side of the lower transverse plate 312 of the support portion 31 by welding.

[0040] Preferably, the support portion 31 is welded into an I-shaped by a carbon steel plate with high strength, and the guide portion 32 is made of a cut portion of I-steel (i.e., the portion remaining after cutting off the upper wing plate). In this way, the support portion 31 can select a reasonable material and thickness according to calculation to meet the disturbance and load required by the large plate heat exchanger, while reducing the height of the upper guide rod 3, thereby reducing the height size of the heat exchanger. The guide portion 32 is made of a cut portion of I-steel to reduce the difficulty of processing, and is welded and assembled with the upper guide rod 3, mainly serving as a hanging belt plate 2.

[0041] Furthermore, in order to improve the structural rigidity of the support portion 31, a plurality of reinforcing ribs (not shown in the figure) are arranged along the left and right directions on the front and rear sides of the vertical plate 313 between the upper horizontal plate 311 and the lower horizontal plate 312, and the plurality of reinforcing ribs located on the same side are evenly distributed along the left and right directions.

[0042] Furthermore, in order to improve the connection strength between the support portion 31 and the guide portion 32, as Figure 6 As shown, a groove extending along the length direction is provided on the lower side surface of the lower horizontal plate 312 of the support portion 31, and the suspended end of the vertical portion 322 of the guide portion 32 is inserted into the groove and then fixedly connected to the lower side surface of the lower horizontal plate 312 by welding.

[0043] Furthermore, if Figure 1 and Figure 3 As shown, the right end surface of the guide portion 32 is located on the left side of the right end surface of the support portion 31, and the right end of the lower cross plate 312 of the support portion 31 is fixedly connected to the upper end surface of the bracket 5 by screws.

[0044] Preferably, a square end plate 34 is provided at the right end of the support portion 31 , and the end plate 34 is fixedly connected to the right end surface of the support portion 31 by welding.

[0045] Furthermore, if Figure 1 and Figure 2 As shown, a blocking block 33 is fixedly provided at the left end of the upper guide rod 3 by welding, and the blocking block 33 is fixedly connected to the right side surface of the fixed clamping plate 1 by screws. A protrusion 333 extending to the left in the horizontal direction is provided at the upper end of the blocking block 33, and the lower side surface of the protrusion 333 is pressed against the upper end surface of the fixed clamping plate 1 under the action of the plate 2, the movable clamping plate 4 and its own gravity.

[0046] Since the plate 2 located on the far left side is to be pressed against the right side surface of the fixed clamping plate 1 , the lower end of the blocking block 33 should not block the guide portion 32 of the upper guide rod 3 .

[0047] As a specific implementation method, Figure 5 and Figure 7 As shown, the block 33 described in this embodiment includes, from top to bottom, a square connection portion 331 and a guide avoidance portion 332 whose shape matches the cross-sectional shape of the guide portion 32 of the upper guide rod 3, and the protrusion 333 is arranged at the upper end of the left side of the connection portion 331. The left end surface of the guide portion 32 of the upper guide rod 3 is flush with the left end surface of the support portion 31 of the upper guide rod 3, and the left end surface of the upper guide rod 3 is fixedly connected to the block 33 by welding. Correspondingly, the connection portion 331 is fixedly connected to the right side surface of the fixed clamping plate 1 by screws.

[0048] Here, the connection portion 331 and the guide avoidance portion 332 of the blocking block 33 are integrated as a whole, that is, are processed from a single plate.

[0049] Furthermore, if Figure 5 and Figure 8 As shown, the right end of the horizontal portion 321 of the guide part 32 of the upper guide rod 3 is located at the front and rear sides of the vertical portion 322 and is respectively provided with an escape notch 3211 opening toward the outside (the side away from the vertical portion 322 in the vertical direction is the outside), and the two escape notches 3211 are symmetrically arranged about the center line of the upper guide rod 3. Figure 8 and Fig. 9 As shown, the width L1 (dimension along the front-to-back direction) of the horizontal portion 321 of the guide portion 32 at the avoidance notch 3211 is slightly larger than the minimum width L2 of the upper slide groove of the plate 2 .

[0050] Here, the “slightly larger than” is judged by the following design requirements:

[0051] First, the plate can be smoothly inserted into the guide part provided with the avoidance notch by tilting at a certain angle, for example, first tilting toward the rear side so that the rear end of the upper slide groove is inserted into the rear side of the guide part, and then rotating the plate forward so that the front end of the upper slide groove is also inserted into the guide part.

[0052] Second, after the plate is inserted into the avoidance notch of the guide part, it will not fall off the guide part due to its own gravity.

[0053] With the above two conditions being satisfied at the same time, the width L1 of the horizontal portion 321 of the guide portion 32 at the avoidance notch 3211 and the minimum width L2 of the upper slide groove of the plate 2 can be specifically designed according to actual needs. As a specific implementation, L1 in this embodiment is 6-10 mm larger than L2.

[0054] The cross section of the lower guide rod 6 is square. As a specific implementation, the lower guide rod described in this embodiment is made of square steel pipe. Fig. 9 As shown, the lower sliding groove cooperates with the lower guide rod, and the inwardly protruding protrusion of the lower sliding groove abuts against the side surface of the lower guide rod.

[0055] In this way, when installing the plate 2, the plate 2 can be placed between the upper guide rod 3 and the lower guide rod 6 by tilting it left and right, so that the upper slide groove of the plate 2 is located in the area of ​​the avoidance gap 3211, and then the plate is rotated forward and backward to make one end of the upper slide groove snap into the guide part, and then the plate is rotated in the opposite direction to make the other end of the upper slide groove also snap into the guide part. Then adjust the position of the plate so that the center line of the plate is coplanar with the center line of the guide part. Then rotate the plate in the left and right directions so that the lower slide groove of the plate snaps into the lower guide rod. Then slide the plate 2 to the left. The disassembly process is the same, which will not be repeated here.

[0056] Embodiment 2

[0057] The lower end surface of the blocking block 33 is flush with the lower side surface of the lower horizontal plate 312, the left end surface of the guide portion 32 of the upper guide rod 3 is flush with the left end surface of the blocking block 33, and the vertical portion 322 of the guide portion 32 is fixedly connected to the whole formed by the blocking block 33 and the support portion 31 by welding. The rest of the structure is the same as that of the first embodiment.

Claims

1. A large plate heat exchanger with large temperature difference and small end difference, comprising a frame formed by a fixed clamping plate, a bracket, an upper guide rod and a lower guide rod, wherein a movable clamping plate is arranged in the frame, a plurality of plates are arranged between the fixed clamping plate and the movable clamping plate, and the upper and lower ends of the movable clamping plate and the plates are slidably connected with the upper guide rod and the lower guide rod, characterized in that: The upper guide rod includes a supporting portion and a guiding portion in sequence from top to bottom, and the movable clamping plate and the plate are respectively matched with the guiding portion to realize sliding connection; The right end surface of the guide portion is located on the left side of the right end surface of the support portion, and the lower side surface of the right end of the support portion is pressed against the upper end surface of the bracket and fixedly connected to the upper end surface of the bracket; The left end of the upper guide rod is fixedly connected to the fixed clamping plate through a blocking block, and a protrusion is provided on the blocking block above the fixed clamping plate, and the lower side of the protrusion is pressed against the upper end surface of the fixed clamping plate; The right end of the guide portion is provided with an avoidance notch, and the plate can be inserted into the guide portion of the upper guide rod through the avoidance notch; The cross section of the guide portion is an inverted T-shaped structure, including a vertical portion and a horizontal portion, the right end of the horizontal portion is located at the front and rear sides of the vertical portion and is respectively provided with an escape notch opening outward, and the width L1 of the horizontal portion of the guide portion at the escape notch is slightly larger than the minimum width L2 of the upper slide groove of the plate; When installing the plate, first place the plate between the upper guide rod and the lower guide rod at an angle left or right so that the upper slide groove of the plate is located in the area of ​​the avoidance gap, then rotate the plate forward and backward so that one end of the upper slide groove is stuck in the guide part, and then rotate the plate in the opposite direction so that the other end of the upper slide groove is also stuck in the guide part, and then adjust the position of the plate so that the center line of the plate is coplanar with the center line of the guide part, and then rotate the plate left or right so that the lower slide groove of the plate is stuck in the lower guide rod.

2. A large plate heat exchanger with large temperature difference and small end difference according to claim 1, characterized in that: The blocking block comprises, from top to bottom, a connecting portion and a guide avoidance portion whose shape matches the cross-sectional shape of the guide portion, and the left end surface of the guide portion is flush with the left end surface of the support portion.

3. A large plate heat exchanger with large temperature difference and small end difference according to claim 1, characterized in that: The lower end surface of the blocking block is flush with the lower side surface of the supporting portion, and the left end surface of the guiding portion is flush with the left end surface of the blocking block.

4. A large plate heat exchanger with large temperature difference and small end difference according to claim 1, characterized in that: The cross section of the guide portion is an inverted T-shaped structure, a groove is provided on the lower side of the support portion, the suspended end of the vertical portion of the guide portion is inserted into the groove and fixedly connected to the support portion by welding.

5. The large plate heat exchanger with large temperature difference and small end difference according to claim 1 is characterized in that: The cross section of the support portion is in an "I" shape, and a plurality of reinforcing rib plates are arranged between the upper horizontal plate and the lower horizontal plate of the support portion on the front and rear sides of the vertical plate.

6. A large plate heat exchanger with large temperature difference and small end difference according to claim 1, characterized in that: The aspect ratio of the plate is greater than or equal to 3.6:1, and the heat exchange area of ​​a single plate is greater than or equal to 3m 2 .

7. The large plate heat exchanger with large temperature difference and small end difference according to claim 1, characterized in that: The depth of the flow channel groove on the plate is between 2.6 mm and 3 mm.

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