Environment-friendly self-cleaning plate heat exchanger

Abstract

The invention relates to the technical field of heat exchange equipment, and discloses an environment-friendly self-cleaning plate heat exchanger which comprises fixed clamping plates, guide rods are installed at the upper ends and the lower ends of the interiors of the two fixed clamping plates correspondingly, a plurality of plate sheets are clamped on the inner sides of the guide rods, and the plate sheets and the fixed clamping plates are attached to each other; a cold outlet and a hot outlet are formed in one side of the outer wall of the fixed clamping plate, a cold inlet and a hot inlet are formed in the other side of the outer wall of the fixed clamping plate, and a self-cleaning mechanism is installed in the sheet bar and used for automatically cleaning an inner channel of the sheet bar. A bubble cleaning mechanism is mounted on one side of the outer wall of the fixed clamping plate and used for introducing carbon dioxide bubbles into the plate to complete cleaning. And tiny bubbles are released through the bubble cleaning mechanism, dirt on the inner wall of the plate is deeply cleaned through the adhesive force of the bubbles and the high-pressure impact force generated when the bubbles are broken, and the continuity and stability of production operation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange equipment, in particular to an environmentally friendly self-cleaning plate heat exchanger. Background Art

[0002] In industrial production, HVAC and many other heat exchange related fields, plate heat exchangers are widely used due to their high heat exchange efficiency, compact structure design and good adaptability. However, as the use time increases, plate heat exchangers face serious fouling problems.

[0003] During the operation of traditional plate heat exchangers, impurities, microorganisms, minerals and other components contained in the fluid will gradually deposit on the surface of the plate and the internal channels to form dirt. For example, in chemical production, chemical reaction products or unreacted raw material residues in the heat exchange fluid may adhere to the plates; in HVAC systems, calcium and magnesium ions in circulating water are prone to scale when the temperature changes. These dirt layers will greatly reduce the heat transfer efficiency of the heat exchanger, because the thermal conductivity of the dirt is much lower than that of the metal plate, and heat transfer is hindered, resulting in a significant increase in energy consumption. According to statistics, severely scaled plate heat exchangers may increase energy consumption by 30% to 50% compared to clean ones.

[0004] Traditional plate heat exchanger cleaning methods mainly include chemical cleaning and mechanical cleaning. Chemical cleaning usually uses corrosive chemicals such as strong acids and strong alkalis to dissolve dirt, but this method has many disadvantages. On the one hand, the use of chemical agents not only causes serious pollution to the environment, but its discharge may also cause problems such as water pH imbalance and soil pollution; on the other hand, chemical agents may corrode the plates and sealing components of the plate heat exchanger, shorten the service life of the equipment, and increase equipment maintenance costs and safety risks. Mechanical cleaning requires manual disassembly of the plate heat exchanger and the use of brushes, high-pressure water guns and other tools for cleaning. This method is labor-intensive and inefficient, and it is easy to damage the equipment during disassembly and installation, resulting in problems such as poor sealing, affecting the normal operation and heat exchange performance of the heat exchanger. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly self-cleaning plate heat exchanger, which solves the problem that chemical cleaning relies on corrosive agents such as strong acids and alkalis, which not only seriously pollutes the environment but also corrodes equipment components.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an environmentally friendly self-cleaning plate heat exchanger, comprising a fixed clamping plate, guide rods are installed at the upper and lower ends of the two fixed clamping plates, the inner sides of the guide rods clamp multiple plates, the multiple plates and the fixed clamping plates are fitted with each other, a cold outlet and a hot outlet are respectively opened on one side of the outer wall of the fixed clamping plate, a cold inlet and a hot inlet are respectively opened on the other side of the outer wall of the fixed clamping plate, a self-cleaning mechanism is installed inside the plate, which is used to complete the automatic cleaning of the internal channel of the plate, and a bubble cleaning mechanism is installed on one side of the outer wall of the fixed clamping plate, which is used to pass carbon dioxide bubbles into the interior of the plate to complete the cleaning.

[0007] Preferably, the self-cleaning mechanism includes a ramp, which is opened on one side of the outer wall of the plate, one end of a lightweight spring is installed on one side of the inner wall of the ramp, and a scraper is installed on the other end of the lightweight spring, and the scraper is in contact with the inner wall of the ramp.

[0008] Preferably, the bubble cleaning mechanism includes an air dissolving chamber, which is opened at one end of the hot inlet, and electric valves are installed at both ends of the air dissolving chamber. The interior of the air dissolving chamber is respectively connected to one end of a gas injection pipe and one end of a cleaning liquid introduction pipe, the gas injection pipe is used to inject carbon dioxide gas into the interior of the air dissolving chamber, and the cleaning liquid introduction pipe is used to inject cleaning liquid into the interior of the air dissolving chamber. The interior of the gas injection pipe is sequentially arranged with a plurality of pressure regulating valves according to the direction of the air flow, and an electromagnetic flowmeter is installed at the connection between the cleaning liquid introduction pipe and the air dissolving chamber.

[0009] Preferably, a bubble release component is installed at the output end of the heat inlet, and the bubble release component includes a microporous plate. The microporous plate is installed on the inner wall of the output end of the heat inlet, and the installation angle of the microporous plate is 30° to 60° with the fluid flow direction.

[0010] Preferably, the hot outlet is provided with a cleaning liquid circulation component, and the cleaning liquid circulation component includes a cyclone separator, the input end of the cyclone separator is connected to the hot outlet, a stainless steel filter is installed inside the cyclone separator, one side of the output end of the cyclone separator is connected to a storage box, a liquid pump is installed on one side of the outer wall of the storage box, the input end of the liquid pump is connected to the storage box, and the output end of the liquid pump is connected to the other end of the cleaning liquid introduction pipe.

[0011] Preferably, the ratio of the diameter of the input end of the cyclone separator to the diameter of the pipe of the hot outlet is 2:1 to 3:1.

[0012] Preferably, a spiral guide vane is installed inside the cyclone separator, and the spiral angle of the spiral guide vane is 30° to 45°.

[0013] Preferably, the bubble cleaning mechanism further comprises a heating element, and the heating element is arranged on the outer wall of the air dissolving chamber.

[0014] Preferably, the top of the scraper is rotatably connected to an auxiliary plate, and a uniformly distributed inclined plate is installed on one side of the outer wall of the auxiliary plate.

[0015] The present invention provides an environmentally friendly self-cleaning plate heat exchanger. It has the following beneficial effects: 1. The present invention improves the cleaning effect by the cooperation between the self-cleaning mechanism and the bubble cleaning mechanism. It can cope with different degrees of dirt adhesion in daily operation. Whether it is slight dirt or more stubborn dirt generated by greater impact force or flow direction change, it can be effectively scraped off and enter the subsequent cleaning link with the fluid. The bubble cleaning mechanism releases tiny bubbles, and uses the adhesion of the bubbles and the high-pressure impact force when they rupture to deeply clean the dirt on the inner wall of the plate. The synergistic effect of the two enables the heat exchanger to maintain a high heat exchange efficiency for a long time, reduce performance degradation caused by dirt accumulation, extend equipment maintenance cycle, reduce maintenance costs and downtime, and improve the continuity and stability of production operations.

[0016] 2. The present invention adopts carbon dioxide bubble cleaning and cooperates with the recycling of cleaning liquid, which has significant environmental advantages. Carbon dioxide is used as a cleaning gas, and its chemical properties are stable, it is not easy to produce harmful by-products, and it is environmentally friendly. The cyclone separator and stainless steel filter in the cleaning liquid circulation component can effectively separate dirt and cleaning liquid, so that the cleaning liquid can be returned to the gas dissolving chamber for recycling through the liquid pump. This not only reduces the large consumption of cleaning liquid and reduces the dependence on water resources, but also avoids the pollution of the environment caused by the discharge of cleaning liquid. At the same time, during the gas dissolving process, the heating element can adjust the temperature of the gas dissolving chamber as needed, optimize the solubility of carbon dioxide, and reduce the additional energy consumption caused by insufficient dissolved gas.

[0017] 3. The structural design of the plate heat exchanger in the present invention contributes to its stability and durability. The fixed clamping plate and the guide rod firmly clamp the plate, ensuring the structural integrity of the equipment during operation and being able to withstand certain fluid pressure and temperature changes. The self-cleaning mechanism is cleverly designed, and the movement of the scraper in the ramp is regulated by a lightweight spring, which ensures smooth movement and is not prone to damage to the internal channels of the plate. The material and process of the dissolved air chamber, microporous plate and other components of the bubble cleaning mechanism have been optimized, and can withstand the effects of cleaning fluid and carbon dioxide, and operate stably for a long time. The cyclone separator, stainless steel filter and other components of the cleaning fluid circulation component also have good wear resistance and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the self-cleaning plate heat exchanger of the present invention; Figure 2 is a schematic diagram of a self-cleaning plate heat exchanger in the present invention; Figure 3 is a schematic diagram of a plate in the present invention; Figure 4 for Figure 3 A in the enlarged view; Figure 5 An exploded view of the bubble cleaning mechanism of the present invention; Figure 6 An exploded view of a cyclone separator in the present invention; Figure 7 This is a diagram showing the bubble cleaning mechanism of the present invention; Figure 8 for Figure 7 Enlarged view of point B in .

[0019] Among them, 1. fixed clamping plate; 2. guide rod; 3. plate; 4. cold outlet; 5. hot outlet; 6. cold inlet; 7. hot inlet; 8. ramp; 9. light spring; 10. scraper; 11. auxiliary plate; 12. inclined plate; 13. dissolved gas chamber; 14. electric valve; 15. gas injection pipeline; 16. cleaning liquid introduction pipeline; 17. pressure regulating valve; 18. electromagnetic flowmeter; 19. microporous plate; 20. heating element; 21. cyclone separator; 22. stainless steel filter; 23. storage box; 24. liquid pump; 25. spiral guide vane. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Please see attached Figure 1 -Attached Figure 8 An embodiment of the present invention provides an environmentally friendly self-cleaning plate heat exchanger, including a fixed clamping plate 1, wherein guide rods 2 are installed at the upper and lower ends of the two fixed clamping plates 1, and a plurality of plates 3 are clamped on the inner side of the guide rods 2. The plurality of plates 3 and the fixed clamping plate 1 are fitted with each other, and a cold outlet 4 and a hot outlet 5 are respectively opened on one side of the outer wall of the fixed clamping plate 1, and a cold inlet 6 and a hot inlet 7 are respectively opened on the other side of the outer wall of the fixed clamping plate 1. A self-cleaning mechanism is installed inside the plate 3, which is used to automatically clean the internal channel of the plate 3, and a bubble cleaning mechanism is installed on one side of the outer wall of the fixed clamping plate 1, which is used to pass carbon dioxide bubbles into the plate 3 to complete cleaning.

[0022] The self-cleaning mechanism includes a ramp 8, which is opened on one side of the outer wall of the plate 3, one end of a light spring 9 is installed on one side of the inner wall of the ramp 8, and a scraper 10 is installed on the other end of the light spring 9, and the scraper 10 is in contact with the inner wall of the ramp 8; The top of the scraper 10 is rotatably connected to an auxiliary plate 11, and an evenly distributed inclined plate 12 is installed on one side of the outer wall of the auxiliary plate 11; Specifically, when the plate heat exchanger is working normally, the fluid flows in the internal channel of the plate 3. When dirt is attached to the inner wall of the channel, the scraper 10 will be subjected to a certain force due to the flow impact of the fluid and the possible pressure fluctuations. The light spring 9 will produce corresponding deformation according to this force. For example, when the impact force is small, the light spring 9 will be slightly compressed or stretched, driving the scraper 10 to move slightly in the ramp 8, and the scraper 10 can scrape off some loose dirt particles. When the impact force is large or the direction of fluid flow changes, the movement of the scraper 10 increases. At this time, the auxiliary plate 11 will rotate under the drive of the scraper 10. The inclined plate 12 on the auxiliary plate 11 can change the flow direction of the fluid in the local area, causing the fluid to produce vortexes or turbulence, further enhancing the disturbance of the dirt, making it easier for the dirt to be scraped off by the scraper 10 and carried by the fluid to the subsequent cleaning process.

[0023] The bubble cleaning mechanism includes an air dissolving chamber 13, which is opened at one end of the hot inlet 7. Electric valves 14 are installed at both ends of the air dissolving chamber 13. The interior of the air dissolving chamber 13 is respectively connected to one end of a gas injection pipe 15 and one end of a cleaning liquid introduction pipe 16. The gas injection pipe 15 is used to inject carbon dioxide gas into the interior of the air dissolving chamber 13. The cleaning liquid introduction pipe 16 is used to inject cleaning liquid into the interior of the air dissolving chamber 13. A plurality of pressure regulating valves 17 are sequentially arranged in the interior of the gas injection pipe 15 according to the direction of the air flow. An electromagnetic flowmeter 18 is installed at the connection between the cleaning liquid introduction pipe 16 and the air dissolving chamber 13.

[0024] The output end of the hot inlet 7 is equipped with a bubble release assembly, which includes a microporous plate 19. The microporous plate 19 is installed on the inner wall of the output end of the hot inlet 7. The installation angle of the microporous plate 19 is 30° to 60° with the fluid flow direction; Specifically, when performing bubble cleaning, the electric valve 14 is first opened, and the cleaning liquid enters the gas dissolving chamber 13 through the cleaning liquid introduction pipe 16. At the same time, the carbon dioxide absorber captures carbon dioxide in the air and injects the carbon dioxide gas into the gas dissolving chamber 134 through the gas injection pipe 15. The pressure regulating valve 17 in the gas injection pipe 15 can accurately adjust the pressure of the carbon dioxide gas. For example, according to factors such as the pressure in the gas dissolving chamber 13, the flow rate of the cleaning liquid, and the required gas dissolving effect, the pressure of the carbon dioxide gas is adjusted within a suitable range to ensure that the carbon dioxide gas can be stably injected into the gas dissolving chamber 13 and fully mixed with the cleaning liquid. The electromagnetic flowmeter 18 monitors the flow rate of the cleaning liquid in real time, so as to control the injection amount of the carbon dioxide gas according to the set proportional relationship, so that the cleaning liquid forms a supersaturated carbon dioxide dissolved cleaning liquid in the gas dissolving chamber 13. When the dissolved air cleaning liquid flows from the hot inlet 7 to the internal channel of the plate 3, it passes through the microporous plate 19. Since the specific installation angle of the microporous plate 19 forms an angle of 30° to 60° with the fluid flow direction, the pressure of the dissolved air cleaning liquid decreases rapidly when passing through the microporous plate 19, and carbon dioxide gas is released from the cleaning liquid to form tiny bubbles. These bubbles flow with the fluid in the internal channel of the plate 3. Due to the adhesion between the bubbles and the dirt and the local high-pressure impact generated when the bubbles burst, the dirt on the inner wall of the plate 3 can be effectively removed.

[0025] The hot outlet 5 is provided with a cleaning liquid circulation component, which includes a cyclone separator 21. The input end of the cyclone separator 21 is connected to the hot outlet 5. A stainless steel filter screen 22 is installed inside the cyclone separator 21. One side of the output end of the cyclone separator 21 is connected to a storage box 23. A liquid pump 24 is installed on one side of the outer wall of the storage box 23. The input end of the liquid pump 24 is connected to the storage box 23, and the output end of the liquid pump 24 is connected to the other end of the cleaning liquid introduction pipe 16.

[0026] The ratio of the diameter of the input end of the cyclone separator 21 to the pipe diameter of the hot outlet 5 is 2:1 to 3:1.

[0027] A spiral guide vane 25 is also installed inside the cyclone separator 21 , and the spiral angle of the spiral guide vane 25 is 30° to 45°.

[0028] The bubble cleaning mechanism further includes a heating element 20, which is disposed on the outer wall of the air dissolving chamber 13; Specifically, when the cleaning liquid containing dirt and carbon dioxide bubbles flows out from the hot outlet 5 and enters the cyclone separator 21, since the ratio of the input end diameter of the cyclone separator 21 to the pipe diameter of the hot outlet 5 is 2:1 to 3:1, the flow rate of the cleaning liquid changes after entering the cyclone separator 21. At the same time, under the action of the spiral guide vane 25, the spiral angle of the spiral guide vane 25 is 30° to 45°, and the cleaning liquid generates a strong cyclone motion. During the cyclone process, larger particles of dirt are thrown to the inner wall of the cyclone separator 21 under the action of centrifugal force, and slide down along the inner wall to the bottom collection area, while the cleaning liquid and smaller particles of dirt and residual bubbles continue to flow in the cyclone. Then, the cleaning liquid passes through the stainless steel filter 22, which can further filter out tiny dirt particles and residual bubbles, and the filtered cleaning liquid enters the storage box 23. The cleaning liquid in the storage box 23 is returned to the gas dissolving chamber 13 through the cleaning liquid introduction pipe 16 for recycling under the action of the liquid pump 24, thereby reducing the consumption and discharge of the cleaning liquid. The heating element 20 arranged on the outer wall of the gas dissolving chamber 13 can play a role in the gas dissolving process. For example, when the ambient temperature is low or the cleaning liquid temperature is low, the heating element 20 is started to increase the cleaning liquid temperature in the gas dissolving chamber 13 to a suitable range. Generally, the cleaning liquid temperature can be maintained between 10°C and 30°C, which can improve the solubility of carbon dioxide in the cleaning liquid, promote the efficient gas dissolving process, and ensure that enough carbon dioxide is dissolved in the cleaning liquid to form a gas-dissolving cleaning liquid for subsequent bubble cleaning work 13.

[0029] Working principle: The embodiment of the present invention provides an environmentally friendly self-cleaning plate heat exchanger, whose self-cleaning function is mainly achieved by the cooperation of the self-cleaning mechanism and the bubble cleaning mechanism. At the same time, the cleaning liquid circulation component ensures the recycling of the cleaning liquid, reducing resource waste and environmental pollution, as follows: When the plate heat exchanger is operating normally, cold fluid flows in from the cold inlet 6, and hot fluid flows in from the hot inlet 7, and flows in the channels on both sides of the plate 3 for heat exchange. At this time, the fluid shuttles through the internal channel of the plate 3. Due to the flow characteristics of the fluid, flow shock and pressure fluctuations will inevitably occur. When dirt begins to adhere to the inner wall of the internal channel of the plate 3, the scraper 10 will be subjected to corresponding forces due to the action of these fluids. If the impact force is small, the lightweight spring 9 installed on one side of the inner wall of the ramp 8 will undergo a slight compression or stretching deformation, and this deformation drives the scraper 10 connected to it to move slightly in the ramp 8. The scraper 10 fits tightly against the inner wall of the ramp 8, and its movement process can scrape off those loose and loosely attached dirt particles to prevent further accumulation of dirt in the plate channel.

[0030] When the impact force is large or the direction of fluid flow changes, the force acting on the scraper 10 increases, and its movement amplitude increases accordingly. At this time, the auxiliary plate 11 that is rotatably connected to the top of the scraper 10 begins to rotate driven by the scraper 10. Evenly distributed inclined plates 12 are installed on one side of the outer wall of the auxiliary plate 11. When the auxiliary plate 11 rotates, these inclined plates 12 will change the flow direction of the fluid in the local area, causing the originally relatively stable fluid to produce vortexes or turbulence. This change in the state of the fluid further enhances the disturbing effect on the dirt, making it easier for the dirt that was originally more tightly attached to be scraped off by the scraper 10. The scraped dirt is carried away by the fluid and moves in the direction of the fluid flow, and is eventually brought into the subsequent cleaning process, laying the foundation for the effective implementation of the entire self-cleaning process; When bubble cleaning is required, the bubble cleaning mechanism starts to operate. First, the electric valves 14 at both ends of the gas dissolving chamber 13 are opened, and the cleaning liquid enters the gas dissolving chamber 13 through the cleaning liquid introduction pipe 16. At the same time, the carbon dioxide gas enters the gas dissolving chamber 13 through the gas injection pipe 15. The multiple pressure regulating valves 17 arranged in sequence according to the direction of the gas flow inside the gas injection pipe 15 play a key role. They can accurately adjust the pressure of the carbon dioxide gas according to the real-time pressure in the gas dissolving chamber 13, the flow rate of the cleaning liquid, and the pre-set gas dissolving effect requirements, etc., to ensure that the carbon dioxide gas can be stably and continuously injected into the gas dissolving chamber 13 and fully mixed with the cleaning liquid. For example, when the pressure in the gas dissolving chamber 13 is high or the flow rate of the cleaning liquid is large, the pressure regulating valve 17 will appropriately adjust the pressure of the carbon dioxide gas to ensure that the gas can be smoothly dissolved in the cleaning liquid.

[0031] At the same time, the electromagnetic flowmeter 18 installed at the connection point between the cleaning liquid introduction pipe 16 and the gas dissolving chamber 13 monitors the flow data of the cleaning liquid in real time. These flow data are transmitted to the control system, and the control system accurately controls the injection amount of carbon dioxide gas according to the preset ratio of carbon dioxide gas to cleaning liquid and the flow rate of the cleaning liquid, so that the cleaning liquid can form a supersaturated carbon dioxide dissolved gas cleaning liquid in the gas dissolving chamber 13. This dissolved gas cleaning liquid has the ability to release a large number of tiny carbon dioxide bubbles when the pressure is reduced.

[0032] When the dissolved gas cleaning liquid flows from the hot inlet 7 to the internal channel of the plate 3, it will pass through the microporous plate 19 installed on the inner wall of the output end of the hot inlet 7. Since the microporous plate 19 has a specific installation angle, which is 30° to 60° with the flow direction of the fluid, when the dissolved gas cleaning liquid passes through the microporous plate 19, the pressure of the fluid will drop rapidly. According to the relationship between the solubility of gas in liquid and pressure, the carbon dioxide gas in the dissolved gas cleaning liquid will be released from the cleaning liquid at this time to form a large number of tiny bubbles. These tiny bubbles flow with the fluid in the internal channel of the plate 3. During the flow process, on the one hand, there is a certain adhesion between the bubbles and the dirt, and the bubbles will adhere part of the dirt to its surface during the movement; on the other hand, when the bubbles burst on the dirt surface or at the contact gap between the dirt and the inner wall of the plate 3, a local high-pressure shock will be generated. This local high-pressure shock can forcefully peel the dirt off the inner wall of the plate 3, thereby effectively removing the dirt on the inner wall of the plate 3 and achieving efficient cleaning of the plate heat exchanger; After the bubble cleaning process is completed, the cleaning liquid containing dirt and carbon dioxide bubbles flows out from the hot outlet 5 and enters the cyclone separator 21 in the cleaning liquid circulation assembly. Since the ratio of the input end diameter of the cyclone separator 21 to the pipe diameter of the hot outlet 5 is 2:1 to 3:1, the flow rate of the cleaning liquid will change significantly after entering the cyclone separator 21. At the same time, the spiral guide vane 25 installed inside the cyclone separator 21 further plays a role. The spiral angle of the spiral guide vane 25 is 30° to 45°. Under its guidance, the cleaning liquid generates a strong cyclone motion.

[0033] In the cyclone process, based on the principle of centrifugal force, larger particles of dirt are thrown toward the inner wall of the cyclone separator 21 under the action of strong centrifugal force, and slide down along the inner wall to the specially set collection area at the bottom, thereby achieving preliminary separation from the cleaning liquid. The cleaning liquid, smaller particles of dirt and residual bubbles continue to flow in the cyclone.

[0034] Then, the cleaning liquid that has undergone preliminary separation continues to flow through the stainless steel filter 22 installed inside the cyclone separator 21. The stainless steel filter 22 has a specific pore size, which can effectively filter out tiny dirt particles and residual bubbles, and further purify the cleaning liquid. The cleaning liquid filtered by the stainless steel filter 22 enters the storage box 23 for temporary storage. The liquid pump 24 installed on one side of the outer wall of the storage box 23 comes into play, and the input end of the liquid pump 24 is connected to the storage box 23, and its output end is connected to the other end of the cleaning liquid introduction pipe 16. Driven by the liquid pump 24, the cleaning liquid in the storage box 23 returns to the gas dissolving chamber 13 through the cleaning liquid introduction pipe 16, and participates in the gas dissolving and cleaning process again, and this cycle is repeated to achieve the recycling of the cleaning liquid, greatly reduce the consumption and discharge of the cleaning liquid, and reflect the environmental protection characteristics.

[0035] In addition, the heating element 20 arranged on the outer wall of the gas dissolving chamber 13 also plays an important role in the entire cleaning process. When the ambient temperature is low or the initial temperature of the cleaning liquid is low, the heating element 20 is started to raise the temperature of the cleaning liquid in the gas dissolving chamber 13 to a suitable range, and the temperature of the cleaning liquid can generally be maintained between 10°C and 30°C. This is because temperature has a significant effect on the solubility of carbon dioxide in the cleaning liquid. Properly increasing the temperature can increase the solubility of carbon dioxide in the cleaning liquid, promote the gas dissolving process to proceed more efficiently, ensure that a sufficient amount of carbon dioxide is dissolved in the cleaning liquid to form a gas dissolving cleaning liquid, provide a sufficient source of bubbles for subsequent bubble cleaning work, and ensure the effectiveness and stability of the entire self-cleaning process.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly self-cleaning plate heat exchanger, comprising a fixed clamping plate (1), characterized in that: Guide rods (2) are installed at the upper and lower ends of the two fixed clamping plates (1), and the inner sides of the guide rods (2) clamp a plurality of plates (3). The plurality of plates (3) and the fixed clamping plates (1) are fitted with each other. A cold outlet (4) and a hot outlet (5) are respectively opened on one side of the outer wall of the fixed clamping plates (1), and a cold inlet (6) and a hot inlet (7) are respectively opened on the other side of the outer wall of the fixed clamping plates (1). A self-cleaning mechanism is installed inside the plates (3) for automatically cleaning the internal channels of the plates (3). A bubble cleaning mechanism is installed on one side of the outer wall of the fixed clamping plates (1) for introducing carbon dioxide bubbles into the interior of the plates (3) for cleaning.

2. An environmentally friendly self-cleaning plate heat exchanger according to claim 1, characterized in that: The self-cleaning mechanism comprises a ramp (8), the ramp (8) being opened on one side of the outer wall of the plate (3), one end of a light spring (9) being mounted on one side of the inner wall of the ramp (8), a scraper (10) being mounted on the other end of the light spring (9), the scraper (10) being in contact with the inner wall of the ramp (8).

3. The environmentally friendly self-cleaning plate heat exchanger according to claim 1, characterized in that: The bubble cleaning mechanism comprises an air dissolving chamber (13), the air dissolving chamber (13) being opened at one end of the hot inlet (7), electric valves (14) being installed at both ends of the air dissolving chamber (13), the interior of the air dissolving chamber (13) being respectively connected to one end of a gas injection pipe (15) and one end of a cleaning liquid introduction pipe (16), the gas injection pipe (15) being used to inject carbon dioxide gas into the interior of the air dissolving chamber (13), the cleaning liquid introduction pipe (16) being used to inject cleaning liquid into the interior of the air dissolving chamber (13), a plurality of pressure regulating valves (17) being arranged in sequence in the interior of the gas injection pipe (15) according to the direction of the gas flow, and an electromagnetic flowmeter (18) being installed at the connection point between the cleaning liquid introduction pipe (16) and the air dissolving chamber (13).

4. The environmentally friendly self-cleaning plate heat exchanger according to claim 3, characterized in that: The output end of the heat inlet (7) is equipped with a bubble release component, the bubble release component comprising a microporous plate (19), the microporous plate (19) being installed on the inner wall of the output end of the heat inlet (7), the installation angle of the microporous plate (19) forming an angle of 30° to 60° with the flow direction of the fluid.

5. The environmentally friendly self-cleaning plate heat exchanger according to claim 3, characterized in that: The hot outlet (5) is provided with a cleaning liquid circulation component, the cleaning liquid circulation component comprising a cyclone separator (21), the input end of the cyclone separator (21) being connected to the hot outlet (5), a stainless steel filter screen (22) being installed inside the cyclone separator (21), one side of the output end of the cyclone separator (21) being connected to a storage box (23), one side of the outer wall of the storage box (23) being installed with a liquid pump (24), the input end of the liquid pump (24) being connected to the storage box (23), and the output end of the liquid pump (24) being connected to the other end of the cleaning liquid introduction pipe (16).

6. The environmentally friendly self-cleaning plate heat exchanger according to claim 5, characterized in that: The ratio of the diameter of the input end of the cyclone separator (21) to the pipe diameter of the hot outlet (5) is 2:1 to 3:

1.

7. The environmentally friendly self-cleaning plate heat exchanger according to claim 5, characterized in that: A spiral guide vane (25) is also installed inside the cyclone separator (21), and the spiral guide vane (25) has a spiral angle of 30° to 45°.

8. The environmentally friendly self-cleaning plate heat exchanger according to claim 3, characterized in that: The bubble cleaning mechanism further comprises a heating element (20), wherein the heating element (20) is arranged on the outer wall of the air dissolving chamber (13).

9. The environmentally friendly self-cleaning plate heat exchanger according to claim 2, characterized in that: The top of the scraper (10) is rotatably connected to an auxiliary plate (11), and one side of the outer wall of the auxiliary plate (11) is mounted with evenly distributed inclined plates (12).

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