A plate heat exchanger capable of waste heat recovery

Abstract

This invention relates to the field of waste heat recovery technology and discloses a plate heat exchanger capable of waste heat recovery, comprising a first connecting plate, several connecting columns fixedly connected to the inner wall of the first connecting plate, a second connecting plate fixedly connected to the end of the connecting columns away from the first connecting plate, and several metal plates placed between the first connecting plate and the second connecting plate. Because the liquid flowing in from the hot water inlet has a relatively high velocity, the edge of the fluid will contact the spiral plate. The fluid at the edge will be guided by the spiral plate, causing the outer layer of liquid to flow along the outer wall of the spiral plate. This will cause the outer fluid to start rotating. When the liquid flows out from the hot water inlet, the fluid near the inner wall of the hot water inlet will flow out in a diffused manner, allowing the fluid at the edge to enter the nearest metal plate first. In this way, it is prevented that the fluid velocity is too high, and the liquid cannot enter the interior of each metal plate evenly, thereby resulting in low heat exchange efficiency.

Description

Technical Field

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

[0002] Plate heat exchangers are highly efficient heat exchange devices widely used in the field of waste heat recovery. This equipment consists of a series of metal plates with a specific corrugated shape stacked together, forming thin rectangular channels between adjacent plates. Hot and cold fluids exchange heat through these alternating channels.

[0003] When the operator opens the valve to allow fluid to enter the heat exchange pipe, the fluid flow rate is relatively fast and will rush directly to the far end of the distribution chamber instead of immediately dispersing to both sides. This results in the fluid staying in the plate for too short a time, uneven flow, uneven temperature distribution in the flow channel, and the generation of thermal stress. Long-term use may lead to the risk of plate warping and deformation. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a plate heat exchanger capable of waste heat recovery, comprising a first connecting plate, a plurality of connecting columns fixedly connected to the inner wall of the first connecting plate, a second connecting plate fixedly connected to the end of the connecting columns away from the first connecting plate, a plurality of metal plates placed between the first connecting plate and the second connecting plate, and further comprising:

[0005] The conveying mechanism is fixedly installed on the side of the connecting plate two away from the connecting plate one;

[0006] A flow-disrupting mechanism is fixedly installed on the inner wall of the conveying mechanism;

[0007] A flow guiding mechanism is fixedly installed on the inner wall of the conveying mechanism;

[0008] The operator delivers hot and cold liquids into the conveying mechanism, where heat exchange occurs inside the metal plates.

[0009] Preferably, the conveying mechanism includes:

[0010] The conveying assembly is fixedly installed on the side of the connecting plate two away from the connecting plate one;

[0011] The water inlet assembly is fixedly installed on the side of the connecting plate two away from the connecting plate one;

[0012] The operator introduces hot and cold water into the water inlet assembly, and the liquid that has completed heat exchange flows out from the delivery assembly.

[0013] Preferably, the turbulence-disrupting mechanism includes:

[0014] A flow-dispersing component is fixedly installed on the inner wall of the water inlet component;

[0015] The fixing component is fixedly installed on the inner wall of the turbulence-disrupting component;

[0016] When the operator opens the valve, liquid enters the water inlet assembly, and the impact of the liquid causes the stationary assembly to rotate.

[0017] Preferably, the flow guiding mechanism includes:

[0018] A diversion component is fixedly installed on the inner wall of the water inlet component;

[0019] A limiting component is fixedly installed on the outer wall of the drainage component;

[0020] When the liquid comes into contact with the drainage component and the confinement component, it is guided, causing the outer liquid to begin to rotate.

[0021] Preferably, the conveying assembly includes a hot water outlet fixedly connected to the side of the connecting plate two away from the connecting plate one, and a cold water outlet fixedly connected to the side of the connecting plate two away from the connecting plate one;

[0022] When the operator opens the valve, the liquid flows in from the water inlet assembly and then flows out from the hot water outlet and the cold water outlet.

[0023] Preferably, the water inlet assembly includes a hot water inlet fixedly connected to the side of the connecting plate two away from the connecting plate one, and a cold water inlet fixedly connected to the side of the connecting plate two away from the connecting plate one;

[0024] The operator opens valves to allow cold water and hot water to enter the cold water inlet and hot water inlet respectively, so that the liquids exchange heat inside the metal plates.

[0025] Preferably, the turbulence-disrupting component includes several fixed rods rotatably connected to the inner wall of the hot water inlet, and a conical cylinder is fixedly connected to one end of the fixed rods near the center of the hot water outlet;

[0026] The conical tube is conical, and the holes in the conical tube near the hot water inlet and outlet are relatively large.

[0027] Preferably, the fixing component includes a connecting rod fixedly connected to the side of several conical cylinders near the center of the hot water inlet, and a fixing ring is rotatably connected to the end of the connecting rods away from the conical cylinders;

[0028] When the liquid enters the hot water inlet, the impact of the liquid will cause the connecting rod and the conical cylinder to start rotating.

[0029] Preferably, the diversion component includes three spiral plates fixedly connected to the inner wall of the hot water inlet, and a spiral arc plate is fixedly connected to the end of the spiral plate near the center of the hot water inlet;

[0030] The spiral arc plate bends towards the center of the spiral plate.

[0031] Preferably, the limiting component includes a spiral clamping plate fixedly connected to the inner wall of the spiral plate near the hot water inlet, and a plurality of guide grooves are provided on the inner wall of the conical cylinder;

[0032] The spiral plate has an L-shaped shape, which works in conjunction with the spiral arc plate to confine impurities inside the spiral plate.

[0033] The present invention has the following beneficial effects:

[0034] (1) By setting a spiral plate, the liquid flowing in from the hot water inlet is faster, which will cause the edge of the fluid to contact the spiral plate. The fluid at the edge will be guided by the spiral plate, causing the liquid on the outer layer to flow along the outer wall of the spiral plate. This will cause the fluid on the outer side to start rotating. When the liquid flows out from the hot water inlet, the fluid near the inner wall of the hot water inlet will flow out in a diffuse manner, so that the fluid at the edge can enter the nearest metal plate first. In this way, the fluid speed is prevented from being too fast, and the liquid cannot enter each metal plate evenly, which would result in low heat exchange efficiency.

[0035] (2) By setting a conical cylinder, when the operator opens the valve or adjusts the flow rate of the liquid, the sudden change in the flow rate of the liquid will cause the kinetic energy of the liquid to be converted into pressure energy instantly. When the pressure wave of the water hammer reaches the conical cylinder, the pressure wave will push the conical surface of the conical cylinder, causing the conical cylinder to start rotating. In this way, part of the linear momentum of the fluid is converted into the angular momentum of the conical cylinder, weakening the pressure wave of the water hammer. This prevents the large pressure wave generated by the operator when adjusting the flow rate of the liquid or closing the valve from being applied to the metal plate, causing the sealing ring on the metal plate to fall off, thus creating a risk of leakage.

[0036] (3) By setting up a conical cylinder, the conical cylinder will rotate when it comes into contact with the water flow. This causes a vortex to appear around the conical cylinder. The vortex generated by the rotation of the conical cylinder will appear behind each conical cylinder. The pressure at the center of the annular vortex is lower than that around it, which will attract fluid or impurities to move towards the center of the vortex. This will exert a resistance on the impurities that were originally in the center of the fluid, causing the heavier impurities in the center of the liquid to leave the center under the action of resistance and move towards the edge of the fluid. In this way, the impurities that were originally in the center will slowly move towards the edge of the liquid, preventing the impurities from being sent into the spiral plate when the outer layer of liquid rotates.

[0037] (4) By setting up a spiral arc plate, the fluid at the edge will start to rotate under the guidance of the spiral plate. The rotating fluid will generate a large centrifugal force, which will cause the heavier impurities inside the fluid to adhere to the inner wall of the hot water inlet under the influence of centrifugal force. At this time, the impurities will enter the spiral plate under the influence of the outer liquid. The impurities will be stuck inside the spiral plate by the restriction of the spiral clamp plate and the spiral arc plate. When they reach the outlet of the hot water inlet, the impurities will first come into contact with the first metal plate under the influence of the fluid. In this way, most of the impurities will be preferentially adsorbed on the first metal plate, which makes it easier for the subsequent operators to focus on cleaning the first metal plate. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the 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.

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the overall structure of the water inlet assembly of the present invention;

[0041] Figure 3 This is a schematic diagram of the hot water inlet location of the present invention;

[0042] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0043] Figure 5 This is a schematic diagram of the overall structure of the spiral card plate of the present invention;

[0044] Figure 6 This is a schematic diagram of the overall structure of the drainage component of the present invention;

[0045] Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle;

[0046] Figure 8 This is a schematic diagram of the overall structure of the flow guiding mechanism of the present invention;

[0047] Figure 9 This is a schematic diagram of the overall structure of the fixing ring of the present invention.

[0048] The attached diagram lists the components represented by each number as follows:

[0049] In the diagram: 12. Connecting plate one; 13. Connecting plate two; 14. Connecting column; 15. Metal plate; 2. Conveying mechanism; 21. Conveying assembly; 211. Hot water outlet; 212. Cold water outlet; 22. Water inlet assembly; 221. Hot water inlet; 222. Cold water inlet; 3. Turbulence mechanism; 31. Turbulence assembly; 311. Fixing rod; 312. Conical cylinder; 32. Fixing assembly; 321. Fixing ring; 322. Connecting rod; 4. Flow guiding mechanism; 41. Flow diversion assembly; 411. Spiral plate; 412. Spiral arc plate; 42. Restriction assembly; 421. Spiral clamping plate; 422. Flow guide groove. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Example 1, please refer to Figures 1-8 The present invention relates to a plate heat exchanger capable of waste heat recovery, comprising a connecting plate 12, wherein a plurality of connecting columns 14 are fixedly connected to the inner wall of the connecting plate 12, a connecting plate 13 is fixedly connected to the end of the connecting column 14 away from the connecting plate 12, and a plurality of metal plates 15 are placed between the connecting plate 12 and the connecting plate 13, and further comprising:

[0052] Conveying mechanism 2 is fixedly installed on the side of connecting plate 2 13 away from connecting plate 12;

[0053] The flow-disrupting mechanism 3 is fixedly installed on the inner wall of the conveying mechanism 2;

[0054] The flow guiding mechanism 4 is fixedly installed on the inner wall of the conveying mechanism 2;

[0055] The operator delivers hot and cold liquids into the inside of the conveying mechanism 2, where they exchange heat inside the metal plate 15.

[0056] Conveying mechanism 2 includes:

[0057] Conveying assembly 21 is fixedly installed on the side of connecting plate 2 13 away from connecting plate 12;

[0058] Water inlet assembly 22 is fixedly installed on the side of connecting plate 2 13 away from connecting plate 1 12;

[0059] The operator introduces hot and cold water into the water inlet component 22, and the liquid that has completed heat exchange flows out from the delivery component 21.

[0060] Example 2, please refer to Figures 1-9 This invention relates to a plate heat exchanger capable of waste heat recovery. Based on Embodiment 1, the turbulence mechanism 3 includes:

[0061] A flow-disrupting component 31 is fixedly installed on the inner wall of the water inlet component 22;

[0062] The fixing component 32 is fixedly disposed on the inner wall of the turbulence component 31;

[0063] When the operator opens the valve, liquid will enter the water inlet assembly 22, and the impact of the liquid will cause the fixed assembly 32 to rotate.

[0064] The flow guiding mechanism 4 includes:

[0065] The diversion component 41 is fixedly installed on the inner wall of the water inlet component 22;

[0066] Restriction component 42 is fixedly disposed on the outer wall of drainage component 41;

[0067] When the liquid comes into contact with the drainage component 41 and the confinement component 42, it is guided, causing the outer liquid to begin to rotate.

[0068] The conveying assembly 21 includes a hot water outlet 211 fixedly connected to the side of the connecting plate 2 13 away from the connecting plate 12, and a cold water outlet 212 fixedly connected to the side of the connecting plate 2 13 away from the connecting plate 12.

[0069] When the operator opens the valve, the liquid flows in from the water inlet component 22 and then flows out from the hot water outlet 211 and the cold water outlet 212.

[0070] The water inlet assembly 22 includes a hot water inlet 221 fixedly connected to the side of the connecting plate 2 13 away from the connecting plate 12, and a cold water inlet 222 fixedly connected to the side of the connecting plate 2 13 away from the connecting plate 12.

[0071] The operator opens the valves to allow cold water to enter the cold water inlet 222 and the hot water inlet 221 respectively, so that the liquid can exchange heat inside the metal plate 15.

[0072] The turbulence-disrupting component 31 includes several fixed rods 311 rotatably connected to the inner wall of the hot water inlet 221, and a conical cylinder 312 is fixedly connected to one end of the fixed rods 311 near the center of the hot water outlet 211.

[0073] Among them, the conical cylinder 312 is conical, and the hole of the conical cylinder 312 near the hot water inlet 221 outlet is larger.

[0074] The fixing component 32 includes a connecting rod 322 fixedly connected to one side of several conical cylinders 312 near the center of the hot water inlet 221, and a fixing ring 321 rotatably connected to one end of the connecting rod 322 away from the conical cylinders 312;

[0075] When the liquid enters the hot water inlet 221, the impact of the liquid will cause the connecting rod 322 and the conical cylinder 312 to start rotating.

[0076] The diversion component 41 includes three spiral plates 411 fixedly connected to the inner wall of the hot water inlet 221, and a spiral arc plate 412 fixedly connected to the end of the spiral plate 411 near the center of the hot water inlet 221.

[0077] The spiral plate 412 bends towards the center of the spiral plate 411. By incorporating a conical cylinder 312, the conical cylinder 312 rotates upon contact with the water flow, creating vortices around it. These vortices appear behind each conical cylinder 312. The pressure at the center of the annular vortex is lower than the surrounding pressure, attracting fluid or impurities towards the center. This exerts resistance on impurities originally located at the center of the fluid, causing heavier impurities in the center to detach from the center and move towards the fluid edge. In this way, some impurities originally located at the center slowly move towards the liquid edge, preventing the outer liquid from being unable to send impurities into the spiral plate 411 during subsequent rotation.

[0078] The limiting component 42 includes a spiral clamping plate 421 fixedly connected to the spiral plate 411 near the inner wall of the hot water inlet 221, and a plurality of guide grooves 422 are provided on the inner wall of the conical cylinder 312.

[0079] The spiral clamp 421 is L-shaped and works in conjunction with the spiral arc plate 412 to confine impurities inside the spiral plate 411. By setting the spiral arc plate 412, the fluid at the edge will start to rotate under the guidance of the spiral plate 411. The rotating fluid will generate a large centrifugal force, which will cause the heavier impurities inside the fluid to adhere to the inner wall of the hot water inlet 221 under the influence of centrifugal force. At this time, the impurities will enter the spiral plate 411 under the influence of the outer liquid. By confining the spiral clamp 421 and the spiral arc plate 412, the impurities are stuck inside the spiral plate 411. When they reach the outlet of the hot water inlet 221, the impurities will first come into contact with the first metal plate 15 under the influence of the fluid. In this way, most of the impurities are preferentially adsorbed on the first metal plate 15, so that the operator only needs to focus on cleaning the first metal plate 15.

[0080] One specific application of this embodiment is as follows: when the operation begins, the operator opens the valves to allow hot water and cold water to enter the metal plate 15 from the hot water inlet 221 and the cold water inlet 222 respectively for heat exchange, while the liquid flows out from the hot water outlet 211 and the cold water outlet 212.

[0081] When the liquid comes into contact with the conical cylinder 312, due to the high flow rate, it impacts the inner wall of the conical cylinder 312. Upon impact, the conical cylinder 312 begins to rotate. The rotating conical cylinders 312 then influence the fluid around them. As the liquid flows through the conical cylinder 312, the liquid at the edge of the hot water inlet 221 comes into contact with the end of the spiral plate 411. This guides the liquid contacting the spiral plate 411, causing the liquid near the inner wall of the hot water inlet 221 to... As the system begins to rotate, the water jet from the valve will become a jet. The outer layer of water will begin to move forward in a rotating manner, while heavier impurities inside the liquid will adhere to the inner wall of the hot water inlet 221 under the influence of centrifugal force. Driven by the outer layer of water, the impurities will begin to move in the direction of the outer layer of water. When the liquid flows out of the hot water inlet 221 and reaches the first metal plate 15, the outer liquid will diffuse into the interior of the first metal plate 15 and exchange heat.

[0082] By setting up the conical cylinder 312, when the conical cylinder 312 comes into contact with the water flow, the conical cylinder 312 will rotate, which will cause vortices to appear around the conical cylinder 312. The vortices generated by the rotation of the conical cylinder 312 will appear behind each conical cylinder 312. The pressure at the center of the annular vortex is lower than that around it, which will attract fluid or impurities to move towards the center of the vortex. This will exert a resistance on the impurities that were originally in the center of the fluid, causing the heavier impurities in the center of the liquid to leave the center under the action of resistance and move towards the edge of the fluid. In this way, the impurities that were originally in the center will slowly move towards the edge of the liquid, preventing the outer layer of liquid from being unable to send the impurities into the spiral plate 411 when it rotates.

[0083] By setting up the conical cylinder 312, when the operator opens the valve or adjusts the liquid flow rate, the sudden change in liquid flow rate will cause the kinetic energy of the liquid to be instantly converted into pressure energy. When the pressure wave of the water hammer reaches the conical cylinder 312, the pressure wave will push the conical surface of the conical cylinder 312, causing the conical cylinder 312 to start rotating. In this way, part of the linear momentum of the fluid is converted into the angular momentum of the conical cylinder 312, weakening the pressure wave of the water hammer. This prevents the large pressure wave generated when the operator adjusts the liquid flow rate or closes the valve from being applied to the metal plate 15, which could cause the sealing ring on the metal plate 15 to fall off, thus creating a risk of leakage.

[0084] By setting up the spiral plate 411, because the liquid flowing in from the hot water inlet 221 has a relatively high speed, the edge of the fluid will come into contact with the spiral plate 411. The fluid at the edge will be guided by the spiral plate 411, causing the outer layer of liquid to flow along the outer wall of the spiral plate 411. This will cause the outer fluid to start rotating. When the liquid flows out from the hot water inlet 221, the fluid near the inner wall of the hot water inlet 221 will flow out in a diffused manner, allowing the fluid at the edge to enter the nearest metal plate 15 first. In this way, it is prevented that the fluid speed is too fast and the liquid cannot enter each metal plate 15 evenly, thus preventing the heat exchange efficiency from being too low.

[0085] By setting the spiral arc plate 412, the fluid at the edge will start to rotate under the guidance of the spiral plate 411. The rotating fluid will generate a large centrifugal force, which will cause the heavier impurities inside the fluid to adhere to the inner wall of the hot water inlet 221 under the influence of centrifugal force. At this time, the impurities will enter the interior of the spiral plate 411 under the influence of the outer liquid. By the restriction of the spiral clamp plate 421 and the spiral arc plate 412, the impurities are stuck inside the spiral plate 411. When they reach the outlet of the hot water inlet 221, the impurities will first come into contact with the first metal plate 15 under the influence of the fluid. In this way, most of the impurities are preferentially adsorbed on the first metal plate 15, which makes it easier for the operators to clean the first metal plate in the future.

[0086] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A plate heat exchanger capable of waste heat recovery, comprising a connecting plate one (12), wherein a plurality of connecting columns (14) are fixedly connected to the inner wall of the connecting plate one (12), and a connecting plate two (13) is fixedly connected to the end of the connecting column (14) away from the connecting plate one (12), and a plurality of metal plates (15) are placed between the connecting plate one (12) and the connecting plate two (13), characterized in that, Also includes: The conveying mechanism (2) is fixedly installed on the side of the connecting plate two (13) away from the connecting plate one (12); A flow-disrupting mechanism (3) is fixedly installed on the inner wall of the conveying mechanism (2); A flow guiding mechanism (4) is fixedly installed on the inner wall of the conveying mechanism (2); In this process, the operator delivers hot and cold liquids into the interior of the conveying mechanism (2) and performs heat exchange inside the metal plate (15).

2. A plate heat exchanger capable of waste heat recovery according to claim 1, characterized in that: The conveying mechanism (2) includes: The conveying assembly (21) is fixedly disposed on the side of the connecting plate two (13) away from the connecting plate one (12); Water inlet assembly (22), the water inlet assembly (22) is fixedly disposed on the side of the connecting plate two (13) away from the connecting plate one (12); The operator introduces hot and cold water into the water inlet assembly (22), and the liquid that has completed heat exchange flows out from the delivery assembly (21).

3. A plate heat exchanger capable of waste heat recovery according to claim 2, characterized in that: The disturbance mechanism (3) includes: A flow-disrupting component (31) is fixedly disposed on the inner wall of the water inlet component (22); A fixing component (32) is fixedly disposed on the inner wall of the turbulence component (31); When the operator opens the valve, liquid will enter the water inlet assembly (22), and the impact of the liquid will cause the fixed assembly (32) to rotate.

4. A plate heat exchanger capable of waste heat recovery according to claim 3, characterized in that: The flow guiding mechanism (4) includes: A diversion component (41) is fixedly disposed on the inner wall of the water inlet component (22); A limiting component (42) is fixedly disposed on the outer wall of the drainage component (41); When the liquid comes into contact with the drainage component and the confinement component, it is guided, causing the outer liquid to begin to rotate.

5. A plate heat exchanger capable of waste heat recovery according to claim 4, characterized in that: The conveying assembly (21) includes a hot water outlet (211) fixedly connected to the side of the connecting plate two (13) away from the connecting plate one (12), and a cold water outlet (212) fixedly connected to the side of the connecting plate two (13) away from the connecting plate one (12). When the operator opens the valve, the liquid flows in from the water inlet assembly (22) and then flows out from the hot water outlet (211) and the cold water outlet (212).

6. A plate heat exchanger capable of waste heat recovery according to claim 4, characterized in that: The water inlet assembly (22) includes a hot water inlet (221) fixedly connected to the side of the connecting plate two (13) away from the connecting plate one (12), and a cold water inlet (222) fixedly connected to the side of the connecting plate two (13) away from the connecting plate one (12). The operator opens the valves to allow cold water and hot water to enter the cold water inlet (222) and hot water inlet (221) respectively, so that the liquid can exchange heat inside the metal plate (15).

7. A plate heat exchanger capable of waste heat recovery according to claim 6, characterized in that: The turbulence assembly (31) includes a plurality of fixed rods (311) rotatably connected to the inner wall of the hot water inlet (221), and a conical cylinder (312) is fixedly connected to one end of the fixed rods (311) near the center of the hot water outlet (211). Among them, the conical tube (312) is conical, and the diameter of the hole at the end near the hot water inlet is larger.

8. A plate heat exchanger capable of waste heat recovery according to claim 7, characterized in that: The fixing component (32) includes a connecting rod (322) fixedly connected to one side of a plurality of conical cylinders (312) near the center of the hot water inlet (221), and a fixing ring (321) is rotatably connected to one end of the plurality of connecting rods (322) away from the conical cylinders (312); When the liquid enters the hot water inlet (221), the impact of the liquid will cause the connecting rod (322) and the conical cylinder (312) to start rotating.

9. A plate heat exchanger capable of waste heat recovery according to claim 7, characterized in that: The diversion assembly (41) includes three spiral plates (411) fixedly connected to the inner wall of the hot water inlet (221), and a spiral arc plate (412) is fixedly connected to the end of the spiral plate (411) near the center of the hot water inlet (221). Among them, the spiral arc plate (412) bends toward the center of the spiral plate (411).

10. A plate heat exchanger capable of waste heat recovery according to claim 9, characterized in that: The limiting component (42) includes a spiral clamping plate (421) fixedly connected to the spiral plate (411) on the side of the inner wall near the hot water inlet (221), and a plurality of flow guide grooves (422) are provided on the inner wall of the conical cylinder (312). The spiral plate (421) has an L-shaped shape, which works with the spiral arc plate (412) to confine impurities inside the spiral plate (411).

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