A plate heat exchanger

Abstract

This invention belongs to the field of heat exchanger technology and discloses a plate heat exchanger, including a heat exchanger body and a gas-liquid separation device. The heat exchanger body has an inlet channel, a separation channel, and a heat exchange channel, with the separation channel communicating with both the inlet channel and the heat exchange channel. The gas-liquid separation device includes an exhaust pipe and a spiral component. The exhaust pipe is located inside the separation channel, with one end connected to the outside, and the sidewall of the other end of the exhaust pipe spaced apart from the bottom of the separation channel. Gas-liquid two-phase refrigerant is transported to the separation channel through the inlet channel, where it undergoes a spiral motion along the built-in spiral component. During this process, the refrigerant generates a strong centrifugal force. The denser liquid refrigerant is continuously thrown towards the inner wall of the separation channel due to centrifugal force, while the lighter gaseous refrigerant, unaffected by centrifugal force, rotates along the surface of the spiral component and is discharged from the heat exchanger body through the exhaust pipe, thus completing the gas-liquid two-phase separation of the refrigerant.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more particularly to a plate heat exchanger. Background Technology

[0002] In the basic knowledge of refrigerant evaporation heat exchange, the physical properties of liquid and gaseous refrigerants are significantly different. For the same mass, the volume of gaseous refrigerant can be hundreds of times that of liquid refrigerant. Liquid refrigerants have a more compact molecular structure, and their heat exchange and thermal conductivity are far superior to those of gaseous refrigerants. Under normal operating conditions, the heat exchange efficiency of liquid is 10-50 times that of gas. The proportion of liquid directly affects the overall heat transfer performance of the heat exchange panel. The higher the liquid coverage, the better the evaporation heat exchange effect of the plate heat exchanger.

[0003] When existing plate heat exchangers are directly applied to refrigerant evaporation, the inlet refrigerant is mostly in a two-phase state with both gas and liquid phases and a fixed dryness. A large amount of gaseous refrigerant preferentially fills most of the heat exchange space inside the plate channels, crowding out the flow area of ​​the liquid refrigerant and causing a significant decrease in the volume percentage of liquid refrigerant within the heat exchange channels. The plate heat exchange surfaces are difficult to fully wet with liquid refrigerant, and the highly thermally conductive liquid refrigerant cannot cover the effective heat exchange area, resulting in a significant increase in film thermal resistance. Ultimately, this leads to a decrease in the overall heat transfer coefficient of the evaporator, and consequently, low heat exchange efficiency under evaporation conditions.

[0004] Therefore, there is an urgent need to develop a plate heat exchanger to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a plate heat exchanger that pre-separates the gas and liquid refrigerants at the equipment inlet, thereby increasing the liquid phase coverage of the flow channel and enhancing the overall heat exchange efficiency of the plate heat exchanger.

[0006] To achieve this objective, the present invention adopts the following technical solution: A plate heat exchanger, comprising: The heat exchanger body has an inlet channel, a separation channel and a heat exchange channel, and the separation channel is connected to the inlet channel and the heat exchange channel respectively. A gas-liquid separation device includes an exhaust pipe and a spiral component. The exhaust pipe is located inside the separation channel, with one end of the exhaust pipe connected to the outside. The bottom of the exhaust pipe is spaced apart from the bottom of the separation channel. The inner sidewall of the spiral component is fixedly wrapped around the outer wall of the exhaust pipe, and the outer sidewall of the spiral component is spaced apart from the sidewall of the separation channel.

[0007] Preferably, the gas-liquid separation device also includes a baffle, which is located at the bottom of the separation channel in the vertical direction and is spaced apart from the side wall at the other end of the exhaust pipe.

[0008] Preferably, in the vertical direction, the area between the side of the baffle away from the exhaust pipe and the bottom of the separation channel is defined as a liquid collection zone, which is located at the entrance of the heat exchange channel.

[0009] Preferably, the baffle includes a rebound portion, which is spaced apart from the bottom of the separation channel. Along the axial direction of the exhaust pipe, the orthographic projection of the exhaust pipe and the orthographic projection of the spiral component are located within the orthographic projection of the rebound portion.

[0010] Preferably, the baffle includes a drainage section, which is an annular structure. The inner wall of the drainage section is fixedly connected to the rebound section, the outer side of the drainage section is bent downward in the vertical direction, and the inner diameter of the separation channel is larger than the outer diameter of the drainage section.

[0011] Preferably, the exhaust pipe is detachably connected to the heat exchanger body.

[0012] Preferably, the plate heat exchanger also includes a pressure plate, a connecting part is provided at the outlet of the exhaust pipe, the pressure plate has a through hole, and the side wall of the connecting part is connected to the side wall of the through hole.

[0013] Preferably, the separation channel extends downward from the top of the heat exchanger body in the vertical direction, and the axis of the separation channel is parallel to the vertical direction.

[0014] Preferably, the sidewalls of the separation channel are made of smooth surfaces.

[0015] Preferably, the heat exchanger body has a medium inlet and a medium outlet. The medium inlet is connected to the separation channel through the inlet channel, and the heat exchange channel is connected to the medium outlet.

[0016] The beneficial effects of this invention are: This invention provides a plate heat exchanger, including a heat exchanger body and a gas-liquid separation device. The heat exchanger body has an inlet channel, a separation channel, and a heat exchange channel, with the separation channel communicating with both the inlet channel and the heat exchange channel. The gas-liquid two-phase refrigerant flowing through the inlet channel is fed into the separation channel for two-phase separation. The gaseous refrigerant is isolated, while the liquid refrigerant is separately introduced into each heat exchange channel to fully wet the plates and participate in evaporation heat exchange. The gas-liquid separation device includes an exhaust pipe and a spiral component. The exhaust pipe is located inside the separation channel, with one end connected to the outside. The bottom of the exhaust pipe is spaced apart from the bottom of the separation channel, facilitating the smooth flow of the gaseous refrigerant separated through the separation channel into the exhaust pipe, completing the discharge and transport of the gaseous refrigerant. The inner wall of the spiral component is fixedly wrapped around the outer wall of the exhaust pipe, and the outer wall of the spiral component is spaced apart from the side wall of the separation channel to form small channels, allowing the ejected liquid refrigerant to flow along these channels.

[0017] The faster-flowing gas-liquid two-phase refrigerant is first transported into the separation channel through the inlet channel, where it spirals along the built-in spiral component. During this process, a strong centrifugal force is generated, continuously pushing the denser liquid refrigerant against the inner wall of the separation channel. The spiral structure further enhances the centrifugal separation effect, causing the liquid phase component to continuously adhere and accumulate on the sidewall of the separation channel. The liquid refrigerant adhering to the inner wall flows along the wall and eventually flows into the various heat exchange channels of the plate heat exchanger. The lighter gaseous refrigerant, unaffected by centrifugal force, rotates along the surface of the spiral component and exits the heat exchanger body through the exhaust pipe, thus completing the gas-liquid two-phase separation of the refrigerant. After pretreatment, the highly thermally conductive pure liquid refrigerant fully wets the heat exchange plates for evaporative heat exchange, reducing the space occupied by the gaseous refrigerant, effectively lowering the film thermal resistance, and significantly improving the overall heat exchange performance of the plate heat exchanger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the plate heat exchanger provided in this embodiment; Figure 2 yes Figure 1 Top view; Figure 3 yes Figure 2 A cross-sectional view along the AA direction; Figure 4 yes Figure 2 Cross-sectional view along the BB direction; Figure 5 This is a schematic diagram of the gas-liquid separation device provided in this embodiment.

[0019] In the picture: 1. Heat exchanger body; 11. Inlet channel; 12. Separation channel; 13. Heat exchange channel; 14. Liquid collection zone; 15. Medium inlet; 16. Medium outlet; 2. Gas-liquid separation device; 21. Exhaust pipe; 211. Connection part; 22. Spiral component; 23. Baffle; 231. Rebound part; 232. Drainage part; 3. Pressure plate; 41. Liquid refrigerant; 42. Gaseous refrigerant; 43. Gas outlet. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] This embodiment provides a plate heat exchanger that pre-separates the gas and liquid refrigerants at the equipment inlet, thereby increasing the liquid phase coverage of the flow channel and enhancing the overall heat exchange efficiency of the plate heat exchanger.

[0025] Specifically, such as Figures 1 to 5 As shown, a plate heat exchanger includes a heat exchanger body 1 and a gas-liquid separation device 2. The heat exchanger body 1 has an inlet channel 11, a separation channel 12, and a heat exchange channel 13, with the separation channel 12 connected to both the inlet channel 11 and the heat exchange channel 13. The gas-liquid two-phase refrigerant flowing through the inlet channel 11 is fed into the separation channel 12 for two-phase separation. The gaseous refrigerant 42 is separated, while the liquid refrigerant 41 is individually introduced into each heat exchange channel 13 to fully wet the plates and participate in the evaporative heat exchange process.

[0026] The gas-liquid separator 2 includes an exhaust pipe 21 and a spiral component 22. The exhaust pipe 21 is located inside the separation channel 12, with one end connected to the outside via a gas outlet 43. The bottom of the exhaust pipe 21 is spaced apart from the bottom of the separation channel 12, facilitating the smooth flow of the gaseous refrigerant 42 separated by the separation channel 12 into the exhaust pipe 21, thus completing the discharge and delivery of the gaseous refrigerant 42. The inner wall of the spiral component 22 is fixedly wrapped around the outer wall of the exhaust pipe 21, and the outer wall of the spiral component 22 is spaced apart from the side wall of the separation channel 12 to form a small channel, allowing the ejected liquid refrigerant 41 to flow along the small channel. In this case, the exhaust pipe 21 is equivalent to a gas outlet 43 channel.

[0027] The faster-flowing gas-liquid two-phase refrigerant is first transported to the separation channel 12 through the inlet channel 11, where it spirals along the built-in spiral component 22. During this process, a strong centrifugal force is generated, causing the denser liquid refrigerant 41 to be continuously thrown towards the inner wall of the separation channel 12. The spiral structure drives the fluid circulation, further enhancing the centrifugal sieving effect and causing the liquid phase component of the two-phase refrigerant to continuously adhere and accumulate on the side wall of the separation channel 12. The liquid refrigerant 41 adhering to the inner wall of the channel flows along the wall and eventually flows into the various heat exchange channels 13 of the plate heat exchanger. The lighter gaseous refrigerant 42, unaffected by centrifugal force, rotates along the surface of the spiral component 22 and flows through the gas outlet 43 channel provided in the exhaust pipe 21, ultimately exiting the heat exchanger body 1 through the gas outlet 43, thus completing the gas-liquid two-phase separation of the refrigerant. After pretreatment, the pure liquid refrigerant 41 with high thermal conductivity fully wets the heat exchange plates to carry out evaporative heat exchange, reducing the space occupied by the gaseous refrigerant 42, effectively reducing the gas film thermal resistance, and significantly improving the overall heat exchange performance of the plate heat exchanger.

[0028] Furthermore, in the vertical direction, the separation channel 12 extends downward from the top of the heat exchanger body 1, and the axis of the separation channel 12 is parallel to the vertical direction. The liquid refrigerant 41 thrown to the side wall of the separation channel 12 by centrifugal force can smoothly flow downward along the inner wall to the heat exchange channel 13 by its own gravity, preventing a large amount of liquid refrigerant 41 from accumulating and accumulating on the side wall of the channel for a long time, avoiding excessive liquid layer interference with the centrifugal screening process, and ensuring that the subsequent gas-liquid separation work can be carried out stably and efficiently.

[0029] Furthermore, the sidewall of the separation channel 12 is made into a smooth surface, which can reduce the wall adhesion resistance during the flow of liquid refrigerant 41, accelerate the downward flow of liquid refrigerant 41 attached to the sidewall, reduce the long-term adhesion and accumulation of refrigerant liquid film on the inner wall, prevent the thick liquid layer from interfering with the centrifugal separation process, and ensure the continuous and stable operation of the gas-liquid separation process.

[0030] Optionally, the gas-liquid separation device 2 also includes a baffle 23, which is located at the bottom of the separation channel 12 in a vertical direction, and is spaced apart from the side wall of the other end of the exhaust pipe 21. After the spiral structure drives the airflow to swirl downwards, the flowing gaseous refrigerant 42 hits the baffle 23 above the separation channel 12 and rebounds, guiding the airflow towards the inlet of the exhaust pipe 21. The rebounded gaseous refrigerant smoothly enters the interior of the exhaust pipe 21, and is continuously transported outwards by the pipeline, finally exiting the heat exchanger from the exhaust pipe 21, completing the independent discharge of the gaseous refrigerant 42.

[0031] Furthermore, along the vertical direction, the side of the baffle 23 facing away from the exhaust pipe 21 and the bottom of the separation channel 12 define a liquid collection area 14, which is located at the entrance of the heat exchange channel 13. Driven by the combined force of airflow and its own gravity, the liquid refrigerant attached to the side wall of the separation channel 12 flows down the inner wall and flows into the bottom liquid collection area 14. The liquid collection area 14 is equipped with a special baffle 23 to separate the liquid refrigerant 41 from the high-speed airflow above, preventing the swirling high-speed airflow from agitating the bottom liquid, avoiding the bottom liquid refrigerant 41 from being blown away by the airflow and agitating liquid mist, causing the gas and liquid refrigerants to mix again, and ensuring the stability of the separated liquid refrigerant 41.

[0032] Optionally, the baffle 23 includes a rebound portion 231, which is spaced apart from the bottom of the separation channel 12. Along the axial direction of the exhaust pipe 21, the orthographic projection of the exhaust pipe 21 and the orthographic projection of the spiral component 22 are located within the orthographic projection of the rebound portion 231. The rebound portion 231 at the top of the separation channel 12 guides and rebounds the high-speed swirling gaseous refrigerant 42, driving it towards the inlet of the exhaust pipe 21. The orthographic projection area of ​​the rebound portion 231 covers the total orthographic projection area of ​​both the exhaust pipe 21 and the spiral component 22, ensuring that all swirling airflow impacts the rebound portion 231, enhancing the airflow guidance and rebound performance, preventing the escape and leakage of a small amount of gaseous refrigerant 42, effectively preventing uncollected gaseous refrigerant 42 from settling and agitating the liquid refrigerant 41 in the liquid collection area 14, avoiding further mixing of the two phases of refrigerant, and maintaining stable separation conditions.

[0033] Furthermore, the side of the rebound section 231 facing the exhaust pipe 21 is machined into a smooth, flat surface. This smooth surface reduces the adhesion and adsorption capacity of the liquid refrigerant 41. After impact, the high-speed flowing liquid refrigerant 41 can quickly slide off the surface of the rebound section 231, preventing the liquid refrigerant 41 from accumulating on the surface of the rebound section 231 for a long time. This avoids the convergence and fusion of gaseous refrigerant 42 and stagnant liquid refrigerant 41 at this point, cutting off the potential risk of secondary mixing of the two-phase refrigerants at the source and ensuring stable gas-liquid separation of the refrigerant.

[0034] Furthermore, the baffle 23 includes a flow-guiding section 232, which has an annular structure. The inner wall of the flow-guiding section 232 is fixedly connected to the rebound section 231, and the outer side of the flow-guiding section 232 bends downward in the vertical direction. The inner diameter of the separation channel 12 is larger than the outer diameter of the flow-guiding section 232. The flow-guiding section 232 can receive the liquid refrigerant 41 remaining on the surface of the rebound section 231, guiding the retained droplets to flow smoothly downward along the surface of the flow-guiding section 232 back to the liquid collection area 14, thus preventing the liquid refrigerant 41 from scattering and causing the two-phase refrigerant to remix.

[0035] It should be noted that in this embodiment, the entire baffle 23 is an inverted U-shaped structure, which can block the high-speed swirling airflow above from directly impacting the bottom liquid collection area 14, and prevent the liquid refrigerant 41 from being impacted by the airflow and causing droplets to splash and enter the exhaust pipe 21 along the pipeline. In other embodiments, the entire baffle 23 can also be an inverted V-shaped structure with a rebound part 231 and a drainage part 232, which will not be described in detail here.

[0036] Optionally, the exhaust pipe 21 is detachably connected to the heat exchanger body 1. When it is necessary to repair easily worn parts such as the spiral component 22 or the exhaust pipe 21, the operator can disassemble the exhaust pipe 21 separately to carry out the work without disassembling the entire plate heat exchanger body 1. This greatly reduces disassembly and assembly time, lowers daily maintenance costs, facilitates regular maintenance by the operator, and ensures the stable and reliable separation performance of the gas-liquid separator 2 for a long time.

[0037] Furthermore, the plate heat exchanger also includes a pressure plate 3, and a connecting part 211 is provided at the outlet of the exhaust pipe 21. The pressure plate 3 has a through hole, and the side wall of the connecting part 211 is connected to the side wall of the through hole. The outer wall of the connecting part 211 of the exhaust pipe 21 and the inner wall of the through hole are fitted together. The positioning and installation between the exhaust pipe 21 and the heat exchanger body 1 are completed by this assembly structure, thereby realizing a detachable connection structure for the exhaust pipe 21 to be independently disassembled and installed.

[0038] Optionally, since the refrigerant fluid itself has slight corrosive properties, long-term flow through the internal components of the separation channel 12 can easily cause corrosion and wear on the parts. Therefore, both the exhaust pipe 21 and the spiral component 22 are made of corrosion-resistant materials to avoid structural damage caused by media corrosion and to stably maintain the gas-liquid separation performance of the gas-liquid separation device 2. Available corrosion-resistant materials include commonly used materials such as stainless steel. The specific material selection is a conventional approach in the field, and will not be described in detail in this embodiment.

[0039] Optionally, the heat exchanger body 1 has a medium inlet 15 and a medium outlet 16. The medium inlet 15 is connected to the separation channel 12 through the inlet channel 11, and the heat exchange channel 13 is connected to the medium outlet 16. The medium inlet 15 connects to the separation channel 12 through the inlet channel 11, which can preferentially deliver the refrigerant carrying both gas and liquid phases to the separation channel 12, completing the centrifugal separation of gaseous refrigerant 42 and liquid refrigerant 41 in advance. After separation, the liquid refrigerant 41 flows into the heat exchange channel 13 to complete the heat absorption and evaporation operation, and finally flows through the heat exchange channel 13 to the medium outlet 16 for discharge. The entire set of flow channels is arranged sequentially to regulate the refrigerant flow sequence and isolate the gaseous refrigerant 42 from interfering with heat exchange, thereby ensuring the overall evaporation heat exchange efficiency of the plate heat exchanger.

[0040] The working principle of the plate heat exchanger provided in this embodiment is as follows: The gas-liquid two-phase refrigerant flows into the two-phase refrigerant inlet channel 11 inside the equipment through the medium inlet 15. After the high-speed flowing two-phase refrigerant reaches the position of the spiral component 22, it undergoes high-speed swirling motion along the spiral structure. Because the liquid refrigerant 41 has a higher density, under the drive of centrifugal force, the heavier liquid refrigerant 41 droplets are continuously thrown towards the inner wall of the separation channel 12.

[0041] Then, under the combined action of airflow thrust and its own gravity, the liquid refrigerant 41 adhering to the side wall flows downward along the inner wall and eventually flows into the liquid collection area 14 at the bottom. A baffle 23 for the liquid refrigerant 41 is installed above the liquid collection area 14, which can prevent the high-speed rotating gaseous refrigerant 42 from rushing directly to the liquid surface, and avoid the high-speed gaseous refrigerant 42 from agitating the collected liquid refrigerant 41, causing the separated gas-liquid refrigerant to mix again.

[0042] The lightweight gaseous refrigerant 42, unconstrained by centrifugal force, continues to flow upwards, passing through the gas outlet 43 channel inside the exhaust pipe 21, and finally being discharged outwards from the gas outlet 43. This entire process achieves stable and efficient gas-liquid separation of the two-phase refrigerant at the inlet of the plate heat exchanger, eliminating the negative impact of the gaseous refrigerant 42 on the heat exchange operation and improving the heat exchange efficiency of the pure liquid refrigerant 41.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A plate heat exchanger, characterized in that, include: The heat exchanger body (1) has an inlet channel (11), a separation channel (12) and a heat exchange channel (13) inside it. The separation channel (12) is connected to the inlet channel (11) and the heat exchange channel (13) respectively. The gas-liquid separation device (2) includes an exhaust pipe (21) and a spiral component (22). The exhaust pipe (21) is located inside the separation channel (12). One end of the exhaust pipe (21) is connected to the outside. The bottom of the exhaust pipe (21) is spaced apart from the bottom of the separation channel (12). The inner sidewall of the spiral component (22) is fixedly surrounded by the outer wall of the exhaust pipe (21). The outer sidewall of the spiral component (22) is spaced apart from the sidewall of the separation channel (12).

2. The plate heat exchanger according to claim 1, characterized in that, The gas-liquid separation device (2) also includes a baffle (23). In the vertical direction, the baffle (23) is located at the bottom of the separation channel (12), and the baffle (23) is spaced apart from the side wall of the other end of the exhaust pipe (21).

3. The plate heat exchanger according to claim 2, characterized in that, Along the vertical direction, the side of the baffle (23) away from the exhaust pipe (21) and the bottom of the separation channel (12) define a liquid collection area (14), which is located at the entrance of the heat exchange channel (13).

4. The plate heat exchanger according to claim 3, characterized in that, The baffle (23) includes a rebound portion (231), which is spaced apart from the bottom of the separation channel (12). Along the axial direction of the exhaust pipe (21), the orthographic projection of the exhaust pipe (21) and the orthographic projection of the spiral component (22) are located within the orthographic projection of the rebound portion (231).

5. The plate heat exchanger according to claim 4, characterized in that, The baffle (23) includes a drainage section (232), which is an annular structure. The inner wall of the drainage section (232) is fixedly connected to the rebound section (231). The outer side of the drainage section (232) is bent downward in the vertical direction, and the inner diameter of the separation channel (12) is larger than the outer diameter of the drainage section (232).

6. The plate heat exchanger according to claim 1, characterized in that, The exhaust pipe (21) is detachably connected to the heat exchanger body (1).

7. The plate heat exchanger according to claim 6, characterized in that, The plate heat exchanger also includes a pressure plate (3), and a connecting part (211) is provided at the outlet of the exhaust pipe (21). The pressure plate (3) has a through hole, and the side wall of the connecting part (211) is connected to the side wall of the through hole.

8. The plate heat exchanger according to claim 1, characterized in that, The separation channel (12) extends downward from the top of the heat exchanger body (1) in the vertical direction, and the axis of the separation channel (12) is parallel to the vertical direction.

9. The plate heat exchanger according to claim 8, characterized in that, The sidewalls of the separation channel (12) are configured as smooth surfaces.

10. The plate heat exchanger according to any one of claims 1-9, characterized in that, The heat exchanger body (1) has a medium inlet (15) and a medium outlet (16). The medium inlet (15) is connected to the separation channel (12) through the inlet channel (11), and the heat exchange channel (13) is connected to the medium outlet (16).

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