Wastewater waste heat recovery plate heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a waste water waste heat recovery plate heat exchanger which comprises a door frame, an upper rail is arranged at the upper end of the door frame, a lower rail is arranged at the lower end of the door frame, a plurality of upper sliding blocks are connected to the outer wall of the upper rail in a sliding mode, and a plurality of lower sliding blocks are connected to the outer wall of the lower rail in a sliding mode. And heat exchange plates are installed on the opposite sides of the outer walls of the upper sliding block and the lower sliding block, pressing sliding blocks are slidably connected to the inner walls of the upper sliding block and the lower sliding block, buttons and external connection blocks are fixedly connected to the outer walls of the pressing sliding blocks, and a distance adjusting assembly is arranged on the inner wall of the lower rail. According to the heat exchanger, the button on the upper sliding block and the lower sliding block is pressed to drive the internal pressing sliding block to slide, and the pressing sliding block is separated from clamping of the clamping blocks fixed to the upper end and the lower end of the heat exchange plate after the spring is compressed, so that the heat exchange plate can be quickly separated from the upper sliding block and the lower sliding block or quickly mounted, and the mounting and dismounting efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a wastewater waste heat recovery plate heat exchanger. Background Technology

[0002] Heat recovery technology plays a vital role in modern industry, especially in boiler systems where significant wastewater discharge is accompanied by substantial heat loss. Traditional boiler blowdown processes directly discharge high-temperature boiler water, wasting energy and causing thermal pollution. In recent years, with increasing demands for energy conservation and emission reduction, heat recovery technology has received widespread attention.

[0003] Currently, common waste heat recovery devices on the market include tubular heat exchangers and plate heat exchangers. These technologies play an important role in improving energy efficiency. Tubular heat exchangers have a simple structure and good resistance to high temperature and high pressure; plate heat exchangers have high heat transfer efficiency and a compact structure. In addition, some companies use more efficient heat pump technology for waste heat recovery. However, tubular heat exchangers have low heat transfer efficiency and occupy a large space; heat pump technology has high initial investment, high operating energy consumption, and poor economic efficiency. Therefore, the utilization rate of plate heat exchangers, which have a small footprint and low cost, is increasing.

[0004] Traditional plate heat exchangers typically consist of multiple stacked heat exchange plates. Wastewater and the fluid to be heated flow alternately on both sides of the plates, exchanging heat through the plates. However, because wastewater often contains suspended solids and impurities, these can easily deposit and clog the flow channels within the plates, requiring frequent disassembly, replacement, and maintenance of the plates. To ensure sealing performance, existing plate heat exchangers usually use bolts or rubber gaskets to secure the plates to the device. When disassembling the plates, a large number of bolts need to be unscrewed one by one, which is cumbersome and consumes a lot of time and manpower. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a wastewater waste heat recovery plate heat exchanger, which aims to improve the problem that the plates of the existing plate heat exchanger are connected by bolts or rubber gaskets, which requires unscrewing a large number of bolts one by one when disassembling the plates, making the operation cumbersome and consuming a lot of time and manpower.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a wastewater waste heat recovery plate heat exchanger, comprising a gantry, an upper rail at the upper end of the gantry, a lower rail at the lower end of the gantry, a plurality of upper sliders slidably connected to the outer wall of the upper rail, a plurality of lower sliders slidably connected to the outer wall of the lower rail, heat exchange plates installed on opposite sides of the outer walls of the upper and lower sliders, a pressing slider slidably connected to the inner walls of both the upper and lower sliders, a button and an external block fixedly connected to the outer wall of the pressing slider, a limit rod fixedly connected to the inner walls of both the upper and lower sliders, a spring provided on the inner walls of both the upper and lower sliders, insertion holes provided on the outer walls of both the upper and lower sliders, a plurality of locking blocks fixedly connected to the outer walls of the heat exchange plates, and an adjustment assembly provided on the inner wall of the lower rail.

[0007] The above technical solution involves fixing and supporting the upper and lower tracks using a gantry frame, providing support for the sliding of the upper and lower sliders, and simultaneously installing and supporting the upper and lower ends of the heat exchange plates using the upper and lower sliders. Pressing the buttons on the upper and lower sliders causes the internal pressing sliders to slide, compressing the springs and disengaging the pressing sliders from the locking blocks that fix the upper and lower ends of the heat exchange plates. This allows the heat exchange plates to be quickly detached from the upper and lower sliders or quickly installed, increasing the efficiency of installation and disassembly.

[0008] As a further description of the above technical solution:

[0009] Preferably, the adjustable distance assembly includes a motor, which is fixedly connected to the outer wall of the lower track. A lead screw is fixedly connected to the output end of the motor, and a drive block is threadedly connected to the outer wall of the lead screw. A drive column and a connecting block are fixedly connected to the outer wall of the lower slide block.

[0010] The above technical solution involves adjusting the distance between multiple heat exchange plates using an adjustable spacing component, rotating a lead screw on the inner wall of the lower track via a motor, sliding a drive block connected to a thread on the outer wall via the lead screw, gradually moving multiple lower sliders via the drive block, and further moving multiple drive columns and connecting blocks to gradually slide, thereby adjusting the interval between the multiple lower sliders.

[0011] As a further description of the above technical solution:

[0012] Preferably, a fixed end plate is slidably connected to one side of the upper and lower rails, and a movable end plate is fixedly connected to one side of the upper and lower rails. The fixed end plate and the movable end plate are connected to each other by multiple connecting rods. The heat exchange plate is disposed between the fixed end plate and the movable end plate. The connecting rods are disposed on both sides of the heat exchange plate. The outer walls of both the fixed end plate and the movable end plate are provided with a wastewater inlet pipe, a wastewater outlet pipe, a medium outlet pipe, and a medium inlet pipe.

[0013] The above technical solution provides fixation for the fixed end plate and sliding support for the sliding end plate via upper and lower rails. The connecting rods adjust the distance between the fixed and sliding end plates and provide fixation and limiting for the sliding end plate. The heat exchange plates provide a heat exchange area for hot wastewater and cooling medium. Multiple pipes provide diversion channels for hot wastewater and cooling medium, thereby increasing heat exchange efficiency.

[0014] As a further description of the above technical solution:

[0015] Preferably, the outer block is slidably connected to the inner walls of the upper and lower sliders, and the outer block is slidably connected to the outer wall of the limiting rod.

[0016] The above technical solution provides support and limits for the sliding of the external block through the inner walls of the upper and lower sliders and the limiting rod, ensuring that it always remains in a straight line and does not tilt when sliding.

[0017] As a further description of the above technical solution:

[0018] Preferably, the spring is sleeved on the outer wall of the limiting rod, one end of the spring is fixedly connected to the inner wall of the upper slider and the lower slider, and the other end of the spring is fixedly connected to the outer wall of the outer block.

[0019] The above technical solution involves installing a spring on the limit rod so that the outer block can compress the spring each time it slides, and the device can be reset by using the spring stress when the block is released.

[0020] As a further description of the above technical solution:

[0021] Preferably, the outer wall of the pressing slider has a slot that extends through it, and the locking block engages with the inner wall of the slot and the insertion hole.

[0022] The above technical solution allows for the following: by creating a slot on the outer wall of the pressing slider, the slot and the insertion hole can be aligned in a straight line when the pressing slider is pressed and slid, facilitating the locking and engaging of the locking block.

[0023] As a further description of the above technical solution:

[0024] Preferably, the lead screw is rotatably connected to the opposite side of the inner wall of the lower track, the drive block is slidably connected to the inner wall of the lower track, and the drive block is fixedly connected to the outer wall of one of the lower slide blocks.

[0025] The above technical solution provides support for the rotation of the lead screw by means of the lower rail and limits the sliding of the drive block, ensuring that the drive block can stably maintain linear motion and drive the end lower slider to slide synchronously.

[0026] As a further description of the above technical solution:

[0027] Preferably, the outer wall of the connecting block has a sliding groove that extends through it, and the driving column is slidably connected to the inner wall of the sliding groove.

[0028] The above technical solution provides a limit to the sliding of the drive column by opening a sliding groove on the outer wall of the connecting block. When the drive column slides to the end of the sliding groove, it can drive the connecting block to continue sliding by abutting against it.

[0029] This utility model has the following beneficial effects:

[0030] 1. In this utility model, pressing the button on the upper and lower sliders causes the internal pressing slider to slide, compressing the spring and causing the pressing slider to disengage from the locking blocks that fix the upper and lower ends of the heat exchange plate. This allows the heat exchange plate to be quickly detached from the upper and lower sliders and the heat exchanger or to be quickly installed, increasing the efficiency of installation and disassembly.

[0031] 2. In this utility model, by fixing drive columns and connecting blocks on multiple lower slides, the motor drives the lead screw to rotate, and the lead screw drives the drive block and one of the lower slides to slide, thereby gradually driving all the lower slides to slide synchronously, so as to realize the distance adjustment between all heat exchange plates, which is convenient for personnel operation. Attached Figure Description

[0032] Figure 1 This is a front view of a wastewater waste heat recovery plate heat exchanger proposed in this utility model.

[0033] Figure 2 This is a side view of a wastewater waste heat recovery plate heat exchanger proposed in this utility model;

[0034] Figure 3 This is a schematic diagram showing the increased distance between the heat exchange plates of a wastewater waste heat recovery plate heat exchanger proposed in this utility model.

[0035] Figure 4 This is a schematic diagram of the upper end of the heat exchange plates of a wastewater waste heat recovery plate heat exchanger proposed in this utility model.

[0036] Figure 5 This is a schematic diagram of the lower end of the heat exchange plates of a wastewater waste heat recovery plate heat exchanger proposed in this utility model.

[0037] Figure 6 This is a cross-sectional view of the heat exchange plate connection structure of a wastewater waste heat recovery plate heat exchanger proposed in this utility model.

[0038] Figure 7 This is a plan view of the adjustable spacing component of a wastewater waste heat recovery plate heat exchanger proposed in this utility model;

[0039] Figure 8 This is a separate schematic diagram of the adjustable spacing component structure of a wastewater waste heat recovery plate heat exchanger proposed in this utility model.

[0040] Figure 9 This is a schematic diagram of the structure of a wastewater waste heat recovery plate heat exchanger after the distance of the adjustable components is increased.

[0041] Legend:

[0042] 1. Gantry; 2. Upper rail; 3. Lower rail; 4. Fixed end plate; 5. Movable end plate; 6. Connecting rod; 7. Upper slider; 8. Lower slider; 9. Heat exchange plate; 10. Press slider; 11. Button; 12. External block; 13. Limit rod; 14. Spring; 15. Socket; 16. Locking block; 17. Adjustment assembly; 1701. Motor; 1702. Lead screw; 1703. Drive block; 1704. Drive column; 1705. Connecting block; 18. Wastewater inlet pipe; 19. Wastewater outlet pipe; 20. Medium outlet pipe; 21. Medium inlet pipe. Detailed Implementation

[0043] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] Reference Figure 1 , Figure 3 and Figure 6 An embodiment of this utility model provides a wastewater waste heat recovery plate heat exchanger, including a gantry 1, an upper rail 2 at the upper end of the gantry 1, a lower rail 3 at the lower end of the gantry 1, a plurality of upper sliders 7 slidably connected to the outer wall of the upper rail 2, a plurality of lower sliders 8 slidably connected to the outer wall of the lower rail 3, heat exchange plates 9 installed on opposite sides of the outer walls of the upper sliders 7 and lower sliders 8, a pressing slider 10 slidably connected to the inner walls of both the upper sliders 7 and lower sliders 8, a button 11 and an external block 12 fixedly connected to the outer wall of the pressing slider 10, a limit rod 13 fixedly connected to the inner walls of both the upper sliders 7 and lower sliders 8, a spring 14 provided on the inner walls of both the upper sliders 7 and lower sliders 8, an insertion hole 15 opened on the outer walls of both the upper sliders 7 and lower sliders 8, a plurality of locking blocks 16 fixedly connected to the outer wall of the heat exchange plates 9, and an adjustment assembly 17 provided on the inner wall of the lower rail 3;

[0045] Specifically, the upper end of the heat exchange plate 9 is slidably connected to the upper rail 2 via the upper slider 7, and the lower end is slidably connected to the lower rail 3 via the lower slider 8. The entire heat exchanger exchanges heat between hot wastewater and cooling medium through multiple heat exchange plates 9. Both the upper and lower ends of the heat exchange plate 9 are fixedly connected with locking blocks 16, which are respectively engaged in the insertion holes 15 opened on the upper slider 7 and the lower slider 8 for connection and fixation. When it is necessary to disassemble the heat exchange plate 9, press the button 11 inward to drive the pressing slider 10 and the external connecting block 12 to slide together, so that the pressing slider 10 disengages from the locking block 16. Then the locking block 16 can be pulled out from the insertion hole 15 to complete the disassembly. When reinstalling, press the button 11 again and then fully insert the locking block 16 into the insertion hole 15 and then release it, thereby increasing the efficiency of installation and disassembly.

[0046] Reference Figure 3 , Figure 7 and Figure 8 The adjustable distance assembly 17 includes a motor 1701, which is fixedly connected to the outer wall of the lower rail 3. The output end of the motor 1701 is fixedly connected to a lead screw 1702. The outer wall of the lead screw 1702 is threadedly connected to a drive block 1703. The outer wall of the lower slider 8 is fixedly connected to a drive column 1704 and a connecting block 1705.

[0047] Specifically, the distance between multiple heat exchange plates 9 is rapidly reduced or increased through the distance adjustment component 17, facilitating heat exchange operations and device disassembly and maintenance. The motor 1701 drives the lead screw 1702 to rotate, causing the drive block 1703 to slide. The drive block 1703 is fixedly connected to the end slider 8. When the end slider 8 is slid, the linkage of multiple drive columns 1704 and connecting blocks 1705 gradually drives all the sliders 8 and the upper heat exchange plates 9 to slide, increasing or decreasing the distance between them for rapid distance adjustment.

[0048] Reference Figure 1 , Figure 2 and Figure 3 A fixed end plate 4 is slidably connected to one side of the upper track 2 and the lower track 3, and a movable end plate 5 is fixedly connected to one side of the upper track 2 and the lower track 3. The fixed end plate 4 and the movable end plate 5 are connected to each other by multiple connecting rods 6. The heat exchange plate 9 is set between the fixed end plate 4 and the movable end plate 5. The connecting rods 6 are set on both sides of the heat exchange plate 9. The outer walls of the fixed end plate 4 and the movable end plate 5 are provided with a wastewater inlet pipe 18, a wastewater outlet pipe 19, a medium outlet pipe 20 and a medium inlet pipe 21.

[0049] Specifically, the fixed end plate 4 is fixed on the opposite side of the upper rail 2 and the lower rail 3 and is located on the outermost side. The movable end plate 5 slides between the upper rail 2 and the lower rail 3 to limit and support multiple heat exchange plates 9. By increasing the number of heat exchange plates 9, different amounts of heat exchange work can be accommodated. The relative positions of the fixed end plate 4 and the movable end plate 5 are adjusted and fixed by multiple connecting rods 6. The wastewater inlet pipe 18, wastewater outlet pipe 19, medium outlet pipe 20 and medium inlet pipe 21 are all opened and pass through the fixed end plate 4 and the movable end plate 5. The wastewater inlet pipe 18 and the wastewater outlet pipe 19 are located on the left side, and the medium outlet pipe 20 and the medium inlet pipe 21 are located on the right side. The wastewater inlet pipe 18 and the medium outlet pipe 20 are located on the upper side, and the wastewater outlet pipe 19 and the medium inlet pipe 21 are located on the lower side. Hot wastewater enters from the top and exits from the bottom, while the cooling medium enters from the bottom and exits from the top. Their flow directions are opposite, thereby increasing the heat exchange efficiency.

[0050] Reference Figure 4 , Figure 5 and Figure 6 The outer block 12 is slidably connected to the inner wall of the upper slider 7 and the lower slider 8. The outer block 12 is slidably connected to the outer wall of the limiting rod 13. The spring 14 is sleeved on the outer wall of the limiting rod 13. One end of the spring 14 is fixedly connected to the inner wall of the upper slider 7 and the lower slider 8. The other end of the spring 14 is fixedly connected to the outer wall of the outer block 12. The outer wall of the pressing slider 10 has a slot that passes through it. The locking block 16 is locked into the slot and the inner wall of the insertion hole 15.

[0051] Specifically, the sliding of the external block 12 is limited by the limiting rod 13, so that the spring 14 can be stably and repeatedly compressed along the direction of the limiting rod 13 each time it slides. This ensures that the slot on the pressing slider 10 is always aligned with the insertion hole 15, which facilitates the engagement and disengagement of the locking block 16 with the slot and insertion hole 15. When the hand is released, the stress of the spring 14 is used to reset the device and support the engagement of the U-shaped locking block 16.

[0052] Reference Figure 7 , Figure 8 and Figure 9 The lead screw 1702 is rotatably connected to the inner wall of the lower track 3 on the opposite side, the drive block 1703 is slidably connected to the inner wall of the lower track 3, and the drive block 1703 is fixedly connected to the outer wall of one of the lower sliders 8.

[0053] Specifically, one end of the lead screw 1702 passes through the outer wall of the lower track 3 and is fixedly connected to the output end of the motor 1701, while the other end is rotatably connected to the other side of the inner wall of the lower track 3. When the motor 1701 drives the lead screw 1702 to rotate, the drive block 1703 slides along the lead screw 1702 and maintains stable linear sliding under the limit of the inner wall of the lower track 3, thereby driving the end block 8 to move.

[0054] Reference Figure 8 and Figure 9 A sliding groove is opened and penetrated on the outer wall of the connecting block 1705, and the drive column 1704 is slidably connected to the inner wall of the sliding groove.

[0055] Specifically, except for the last and first sliding blocks 8, each sliding block 8 in the middle is fixedly connected to a drive post 1704 and a connecting block 1705 at its bottom. The drive post 1704 on the previous sliding block 8 is slidably connected to the sliding groove of the connecting block 1705 on the next sliding block 8. When the last sliding block 8 moves, the drive post 1704 fixed on this sliding block 8 slides along the sliding groove of the connecting block 1705 fixed on the next sliding block 8. When it reaches the end of the groove, it abuts against the inner wall and drives the connecting block 1705 to slide. The connecting block 1705 drives the next sliding block 8 to continue sliding, repeating the above action, and finally driving all the middle sliding blocks 8 to slide, thereby increasing or decreasing the distance between each sliding block 8, that is, the distance between each heat exchange plate 9.

[0056] Working principle: When using this heat exchanger for wastewater heat recovery, high-temperature wastewater is discharged from the boiler drain outlet into the heat exchanger through the wastewater inlet pipe 18, and the cooling medium is discharged into the heat exchanger through the medium inlet pipe 21. The wastewater and the cooling medium exchange heat through multiple heat exchange plates 9, the wastewater temperature decreases, and the cooling medium temperature increases. The low-temperature wastewater after heat exchange is discharged from the wastewater outlet pipe 19, and the high-temperature cooling medium is discharged from the medium outlet pipe 20, which can be used for other heating needs.

[0057] When it is necessary to disassemble, clean, or replace the heat exchange plate 9, first slide the movable end plate 5 to disengage from the limit on the heat exchange plate 9, then start the motor 1701 to drive the lead screw 1702 to rotate, thereby causing the drive block 1703 connected to the lead screw 1702 to slide along the lead screw 1702, and causing the lower slider 8 and the heat exchange plate 9 at the end to slide backward. The lower slider 8 will drive a drive column 1704 fixedly connected to it to move synchronously. After the drive column 1704 slides a certain distance, it will abut against and drive the connecting block 1705 on its outer wall to slide. The connecting block 1705 is fixedly connected to the outer wall of the next lower slider 8, so the next lower slider 8 and the heat exchange plate 9 will slide. This process is repeated until all the lower sliders 8 and the heat exchange plates 9 have moved evenly and separated from each other, making it convenient for the staff to operate the heat exchange plate 9 through the gap.

[0058] Next, press the buttons 11 on the upper slider 7 and lower slider 8 that connect the heat exchange plate 9 in sequence. This will cause the internal pressing slider 10 to slide inward and cause the external block 12 to compress the spring 14. When pressed to the deepest point, the slot on the pressing slider 10 will align with the insertion hole 15 on the upper slider 7 and lower slider 8, releasing the locking block 16. At this point, the heat exchange plate 9 can be quickly removed from the upper slider 7 and lower slider 8 respectively. Repeating the steps again will quickly complete the reinstallation of the heat exchange plate 9, which is convenient and quick.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wastewater waste heat recovery plate heat exchanger, comprising a gantry (1), characterized in that: The upper end of the gantry (1) is provided with an upper rail (2), and the lower end of the gantry (1) is provided with a lower rail (3). Multiple upper sliders (7) are slidably connected to the outer wall of the upper rail (2), and multiple lower sliders (8) are slidably connected to the outer wall of the lower rail (3). Heat exchange plates (9) are installed on opposite sides of the outer walls of the upper sliders (7) and lower sliders (8). Pressing sliders (10) are slidably connected to the inner walls of both the upper sliders (7) and lower sliders (8). The outer wall of the 0) is fixedly connected with a button (11) and an external block (12). The inner walls of the upper slider (7) and the lower slider (8) are fixedly connected with limit rods (13). The inner walls of the upper slider (7) and the lower slider (8) are provided with springs (14). The outer walls of the upper slider (7) and the lower slider (8) are provided with insertion holes (15). The outer wall of the heat exchange plate (9) is fixedly connected with multiple locking blocks (16). The inner wall of the lower track (3) is provided with a distance adjustment component (17).

2. The wastewater waste heat recovery plate heat exchanger according to claim 1, characterized in that: The adjustable distance assembly (17) includes a motor (1701), which is fixedly connected to the outer wall of the lower rail (3). The output end of the motor (1701) is fixedly connected to a lead screw (1702), and the outer wall of the lead screw (1702) is threadedly connected to a drive block (1703). The outer wall of the lower slider (8) is fixedly connected to a drive column (1704) and a connecting block (1705).

3. A wastewater waste heat recovery plate heat exchanger according to claim 1, characterized in that: A fixed end plate (4) is slidably connected to the opposite side of the upper track (2) and the lower track (3), and a movable end plate (5) is fixedly connected to the opposite side of the upper track (2) and the lower track (3). The fixed end plate (4) and the movable end plate (5) are connected to each other by multiple connecting rods (6). The heat exchange plate (9) is arranged between the fixed end plate (4) and the movable end plate (5). The connecting rods (6) are arranged on both sides of the heat exchange plate (9). The outer walls of the fixed end plate (4) and the movable end plate (5) are provided with a wastewater inlet pipe (18), a wastewater outlet pipe (19), a medium outlet pipe (20), and a medium inlet pipe (21).

4. A wastewater waste heat recovery plate heat exchanger according to claim 1, characterized in that: The outer block (12) is slidably connected to the inner walls of the upper slider (7) and the lower slider (8), and the outer block (12) is slidably connected to the outer wall of the limiting rod (13).

5. A wastewater waste heat recovery plate heat exchanger according to claim 1, characterized in that: The spring (14) is sleeved on the outer wall of the limiting rod (13). One end of the spring (14) is fixedly connected to the inner wall of the upper slider (7) and the lower slider (8), and the other end of the spring (14) is fixedly connected to the outer wall of the outer block (12).

6. A wastewater waste heat recovery plate heat exchanger according to claim 1, characterized in that: The outer wall of the pressing slider (10) has a slot that extends through it, and the locking block (16) is engaged with the inner wall of the slot and the insertion hole (15).

7. A wastewater waste heat recovery plate heat exchanger according to claim 2, characterized in that: The lead screw (1702) is rotatably connected to the opposite side of the inner wall of the lower track (3), the drive block (1703) is slidably connected to the inner wall of the lower track (3), and the drive block (1703) is fixedly connected to the outer wall of one of the lower sliders (8).

8. A wastewater waste heat recovery plate heat exchanger according to claim 2, characterized in that: The outer wall of the connecting block (1705) has a sliding groove that extends through it, and the driving column (1704) is slidably connected to the inner wall of the sliding groove.

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