Distribution structure and plate heat exchanger applying the distribution structure

Abstract

The present invention discloses a distribution structure and a plate heat exchanger applying the distribution structure. The distribution structure includes a liquid inlet header and a spiral flow spoiler disposed in the liquid inlet header. One end of the liquid inlet header is provided with a liquid inlet hole. The outer edge of the spiral flow spoiler is fixedly connected to the inner wall of the liquid inlet header, and the spiral flow spoiler divides the cavity inside the liquid inlet header to form a spiral laminated flow channel. A liquid passing hole is provided on one side of the spiral flow spoiler in contact with the liquid inlet header. The side wall of the liquid inlet header is provided with a plurality of liquid inlet holes, and the liquid inlet holes are all communicated with the spiral laminated flow channel. In the technical method disclosed in the present invention, the fluid flows into the spiral laminated flow channel and flows in a spiral shape, and is uniformly discharged outward from the liquid inlet hole by the action of centrifugal force. At the same time, the liquid passing hole is provided to prevent excessive fluid from accumulating at the corresponding position and causing uneven distribution, greatly reducing the pressure loss of the fluid and improving the uniformity of fluid distribution, thereby improving the heat exchange efficiency of the plate heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and particularly relates to a distribution structure and a plate heat exchanger applying the distribution structure. Background Art

[0002] Due to the advantages of high efficiency, energy conservation, and environmental protection, plate heat exchangers are widely used in fields such as chemical industry, refrigeration, and food industry. However, their process combinations are complex. Since there are multiple parallel channels in the co-current flow path, there is a phenomenon of uneven fluid distribution in actual applications, resulting in the inability to fully utilize the heat exchange area and affecting the heat exchange performance of the heat exchanger. To solve the problem of uneven fluid distribution in parallel channels, the conventional technical method is to add a distribution structure in the inlet header of the plate heat exchanger to solve the above problem.

[0003] For example, in the patent with the application number CN201920518483.2, a solution is disclosed in which adjacent two plates are relatively stamped and flanged at the channel inlet to form a circumferential distribution channel and an annular liquid inlet channel, which can reduce the resistance of the distribution channel and improve the uniformity. The inlet of each channel is limited to a small hole structure to prevent too much fluid from entering a specific channel, or a distribution header structure with multiple small holes opened along the flow direction length is set, and each small hole corresponds to a flow channel. However, in this prior art method, the size of the liquid inlet channel cannot be reasonably adjusted, resulting in difficulty in achieving the effect of uniform fluid distribution, and at the same time, it is easy to cause the problem of blockage of the liquid inlet channel due to the too small size of the small holes. Therefore, the distribution structure used in the prior art method for plate heat exchangers has the problem of poor fluid distribution effect. Summary of the Invention

[0004] Embodiments of the present invention provide a distribution structure and a plate heat exchanger applying the distribution structure, aiming to solve the problem of poor fluid distribution effect existing in the distribution structure used in the prior art method for plate heat exchangers.

[0005] In a first aspect, embodiments of the present invention provide a distribution structure, which includes a liquid inlet header and a spiral flow disturbing plate arranged in the liquid inlet header; one end of the liquid inlet header is provided with a liquid inlet hole;

[0006] The outer edge of the spiral flow disturbing plate is fixedly connected to the inner wall of the liquid inlet header, and the spiral flow disturbing plate divides the cavity inside the liquid inlet header to form a spiral laminated flow channel; a liquid passing hole is provided on the side of the spiral flow disturbing plate in contact with the liquid inlet header;

[0007] The side wall of the liquid inlet header is provided with a plurality of liquid inlet holes, and the liquid inlet holes are all communicated with the spiral laminated flow channel;

[0008] The liquid inlet holes are arranged at intervals in the multi-layer flow channels of the spiral laminated flow channel.

[0009] In the above distribution structure, optionally, the liquid passing holes are arranged at the bottom of the liquid inlet header and arranged along the axial direction of the liquid inlet header.

[0010] In the above distribution structure, optionally, the setting height of the liquid passing holes is 0.01 to 0.1 times the diameter of the liquid inlet header.

[0011] In the above distribution structure, optionally, at least two liquid inlet holes are arranged in each flow channel provided with the liquid inlet holes in the spiral laminated flow channel.

[0012] In the above distribution structure, optionally, the liquid inlet holes are all arranged within a first included angle range, and the first included angle range is the range with an included angle of 60° with the plumb line in the cross-sectional direction of the liquid inlet header.

[0013] In the above distribution structure, optionally, the ratio between the total area of the liquid inlet holes and the cross-sectional area of the liquid inlet header is 0.1 to 0.5.

[0014] In the above distribution structure, optionally, the liquid inlet holes are all arranged close to the liquid passing holes.

[0015] In the above distribution structure, optionally, the liquid inlet holes are arranged upstream of the liquid passing holes of the subsequent flow channel in the fluid flow direction, and the fluid flow direction is the direction in which the fluid flows in the spiral laminated flow channel.

[0016] In a second aspect, an embodiment of the present invention provides a plate heat exchanger, wherein the plate heat exchanger includes a heat exchanger main body and the distribution structure as described in the first aspect above;

[0017] The heat exchanger main body is composed of a front seal plate, a rear seal plate and a plurality of heat exchange plates; the heat exchange plates are laminated between the front seal plate and the rear seal plate to form a plurality of heat exchange channels;

[0018] The distribution structure is arranged at one end of the heat exchange channel, and the spiral laminated flow channel of the distribution structure is communicated with a plurality of the heat exchange channels at intervals through the liquid inlet holes; the other end of the heat exchange channel communicated with the spiral laminated flow channel is communicated with the liquid outlet of the heat exchanger main body;

[0019] Both ends of the heat exchange channel not communicated with the spiral laminated flow channel are respectively communicated with the water inlet and the water outlet of the heat exchanger main body.

[0020] In the above plate heat exchanger, the spacing of the heat exchange channels is equal.

[0021] As can be seen from the above solution, a distribution structure and a plate heat exchanger applying the distribution structure provided by the present invention, the distribution structure includes a liquid inlet header and a spiral turbulator disposed in the liquid inlet header; one end of the liquid inlet header is provided with a liquid inlet hole; the outer edge of the spiral turbulator is fixedly connected to the inner wall of the liquid inlet header, and the spiral turbulator divides the cavity inside the liquid inlet header to form a spiral laminated flow channel; a liquid passing hole is provided on one side of the spiral turbulator in contact with the liquid inlet header; a plurality of liquid inlet holes are provided on the side wall of the liquid inlet header, and the liquid inlet holes are all communicated with the spiral laminated flow channel; the liquid inlet holes are arranged at intervals in the multi-layer flow channels of the spiral laminated flow channel.

[0022] That is to say, in the embodiment of the present invention, the fluid flows into the spiral laminated flow channel and flows in a spiral shape, and is evenly discharged outward from the liquid inlet hole by the action of centrifugal force. At the same time, the liquid passing hole is provided to avoid excessive fluid accumulation at the corresponding position, resulting in uneven distribution, greatly reducing the pressure loss of the fluid and improving the uniformity of fluid distribution, thereby improving the heat exchange efficiency of the plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is the axial sectional structure diagram of the plate heat exchanger provided by the embodiment of the present invention;

[0025] Figure 2 It is the three-dimensional structure diagram of the distribution structure provided by the embodiment of the present invention;

[0026] Figure 3 It is the sectional structure diagram of A-A in the axial sectional structure diagram provided by the embodiment of the present invention;

[0027] Figure 4 It is the three-dimensional structure diagram of the spiral turbulator provided by the embodiment of the present invention;

[0028] Figure 5 It is the overall structure diagram of the plate heat exchanger provided by the embodiment of the present invention.

[0029] Attachment Marking Explanation: 1. Liquid inlet; 2. Liquid outlet; 3. Water inlet; 4. Water outlet; 5. Rear end plate; 6. Front end plate; 7. Heat exchange plate; 8. Liquid inlet header; 81. Liquid inlet hole; 9. Spiral turbulator; 91. Liquid passing hole; R. Included angle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] To solve the problem of poor fluid distribution in the distribution structure for plate heat exchangers in the prior art, an embodiment of the present invention provides a distribution structure. Please refer to Figures 1 to 4 , as shown in the figure, the distribution structure in the technical method of the present application includes a liquid inlet header 8 and a spiral flow spoiler 9 disposed in the liquid inlet header 8; one end of the liquid inlet header 8 is provided with a liquid inlet 1; the outer edge of the spiral flow spoiler 9 is fixedly connected to the inner wall of the liquid inlet header 8, and the spiral flow spoiler 9 divides the cavity inside the liquid inlet header 8 to form a spiral laminated flow channel; a liquid passing hole 91 is provided on one side of the spiral flow spoiler 9 in contact with the liquid inlet header 8; a plurality of liquid inlet holes 81 are provided on the side wall of the liquid inlet header 8, and the liquid inlet holes 81 are all communicated with the spiral laminated flow channel; the liquid inlet holes 81 are spaced apart and disposed in multiple flow channels of the spiral laminated flow channel.

[0032] The distribution structure in the technical method of the present application mainly consists of a liquid inlet header 8 and a spiral flow spoiler 9. A plurality of liquid inlet holes 81 are provided on the side wall of the liquid inlet header 8. Specifically, the liquid inlet holes 81 are all arranged corresponding to the positions of the heat exchange channels. A liquid passing hole 91 is provided on one side of the spiral flow spoiler 9 in contact with the inner wall of the liquid inlet header 8. During the specific use process, as Figure 1 shown, the liquid flows into the liquid inlet header 8 from the liquid inlet 1. The spiral flow spoiler 9 divides the internal space of the liquid inlet header 8 into a spiral laminated flow channel. The spiral laminated flow channel is formed by spiral lamination and combination of multiple flow channels. The liquid inlet holes 81 are distributed on the side wall of the liquid inlet header 8 for distributing the fluid flowing in the spiral laminated flow channel. The fluid rotates and flows along the inner wall of the liquid inlet header 8 under the action of centrifugal force. Under the action of centrifugal force, the fluid is thrown outwards through the liquid inlet holes 81 provided on the pipe wall and enters the corresponding heat exchange channels, thereby overcoming the problems of large pressure loss and uneven fluid distribution caused by the 90° turn of the traditional liquid inlet pipe, improving the uniformity of fluid distribution of the distribution structure, and thus improving the heat exchange performance of the heat exchanger. At the same time, the above distribution structure is simple and easy to process, and has strong feasibility.

[0033] Generally speaking, the gas phase has good expandability, and the problem of uneven distribution is more reflected in the liquid phase distribution. In the technical method of this application, the spiral spoiler 9 guides the fluid in the liquid inlet header 8 to flow in a spiral manner. During the spiral flow of the fluid, a centrifugal force is generated. Under the action of the centrifugal force, the liquid phase is subjected to a greater centrifugal force and is more distributed near the inner wall of the liquid inlet header 8, while the gas phase is subjected to a smaller centrifugal force and is more distributed in the central area of the pipeline. The liquid droplets near the inner wall of the liquid inlet header 8 are captured by the wall surface to form a liquid flow. Under the entrainment of the spiral motion of the fluid, the liquid droplets flow along the wall surface, and part of the liquid in the fluid is thrown outwards through the liquid inlet holes 81 opened on the wall surface and enters the heat exchange reaction flow channel. During the distribution of the fluid by the liquid inlet header 8, the gas phase expands towards the wall surface area under the action of the pressure, so that the gas phase gradually mixes into the liquid phase and flows into the spiral laminated flow channel with the liquid phase. When the liquid volume is small, the gas phase can carry the liquid droplets into the heat exchange channel. Among them, the shape of the liquid inlet hole 81 can be set to any shape, and the shape of the liquid inlet hole 81 includes but is not limited to circular, oval, square, strip, other polygons, etc.

[0034] The unthrown liquid, part of it continues to flow forward in a spiral manner with the main fluid, and part of it stays at the bottom of the liquid inlet header 8 and accumulates under the combined action of gravity and fluid resistance. In the technical method of this application, a liquid passing hole 91 can be provided at the bottom of the liquid inlet header 8, and the liquid accumulated at the bottom of the liquid inlet header 8 is drained through the liquid passing hole 91, so that the liquid accumulated at the bottom can directly cross the flow channel and flow, that is, it can avoid the problem of excessive liquid accumulation at the bottom of the liquid inlet header 8 and exacerbating the uneven distribution. Among them, the shape of the liquid passing hole 91 is not limited, as long as it ensures that the liquid at the bottom of the liquid inlet header 8 can cross multiple layers of flow channels and flow.

[0035] In a more specific embodiment, the liquid passing holes 91 are provided at the bottom of the liquid inlet header 8 and arranged along the axial direction of the liquid inlet header 8. Specifically, the setting height of the liquid passing holes 91 is 0.01 to 0.1 times the diameter of the liquid inlet header 8.

[0036] Specifically, the liquid passing holes 91 can be arranged along the axial direction of the liquid inlet header 8, and the specific setting result is as Figure 2 and Figure 4 shown. Among them, the setting height of the liquid passing holes 91 is designed to match the size of the liquid inlet header 8. In the specific application process, the height of the liquid passing holes 91 can be set to 0.01 to 0.1 times the diameter of the liquid inlet header 8.

[0037] In a more specific embodiment, at least two liquid inlet holes 81 are provided in each layer of the flow channel provided with the liquid inlet holes 81 in the spiral laminated flow channel. Specifically, the liquid inlet holes 81 are all arranged within a first included angle range, and the first included angle range is the range with an included angle of 60° with the plumb line in the cross-sectional direction of the liquid inlet header 8.

[0038] Specifically, the total number of the liquid inlets 81 can be set to an integer multiple of the number of the flow channels provided with liquid inlets in the spiral laminated flow channel, such as 1 time, 2 times, etc. of the number of the flow channels. In a specific embodiment, two liquid inlets can be provided in each layer of the flow channels provided with liquid inlets in the spiral laminated flow channel. The specific setting structure is as Figure 2 shown. It can also be set that more than two liquid inlets are provided in each layer of the flow channels provided with liquid inlets in the spiral laminated flow channel, and the specific number can be flexibly adjusted according to the pipe diameter of the liquid inlet header 8.

[0039] To further improve the efficiency of fluid distribution by the liquid inlets 81, the liquid inlets 81 can be all arranged within a first included angle range, wherein the first included angle range is also an included angle of 60° with the plumb line in the cross-sectional direction of the liquid inlet header 8. As Figure 3 shown, the included angle ∠R between the boundary of the first included angle range and the plumb line is 60°. Then the liquid inlets 81 are arranged circumferentially along the corresponding flow channel positions and are distributed within a range of 60° deviating from the bottom of the liquid inlet header 8.

[0040] In a more specific embodiment, the ratio of the total area of the liquid inlets 81 to the cross-sectional area of the liquid inlet header 8 is 0.1 to 0.5. Among them, the liquid inlets 81 are all arranged close to the liquid passing holes 91. Specifically, the liquid inlets 81 are arranged upstream of the liquid passing holes 91 of the subsequent layer of flow channels in the fluid flow direction, and the fluid flow direction is the direction in which the fluid flows in the spiral laminated flow channel.

[0041] The ratio of the total area of the liquid inlets 81 to the cross-sectional area of the liquid inlet header 8 is 0.1 to 0.5. In the specific application process, the ratio of the total area of the liquid inlets 81 to the cross-sectional area of the liquid inlet header 8 can be set to be about 0.1 to 0.5. The smaller the ratio of the total area of the liquid inlets 81 to the cross-sectional area of the liquid inlet header 8, the more conducive to uniform distribution, but the greater the liquid pressure drop required to be input at the liquid inlet 1. The specific ratio of the total area of the liquid inlets 81 to the cross-sectional area of the liquid inlet header 8 is determined according to the application scenario.

[0042] In the specific application process, the liquid inlets 81 can be arranged close to the liquid passing holes 91; more specifically, the liquid inlets 81 can also be arranged upstream of the liquid passing holes 91 of the subsequent layer of flow channels in the fluid flow direction. The specific setting position is as Figure 2As shown in the figure. When the liquid flows in a spiral manner in the liquid inlet header 8, part of the liquid is first thrown out of the liquid inlet holes 81 due to centrifugal force and enters the corresponding heat exchange channels. Then, when the remaining part of the liquid in the continuously flowing fluid gathers at the bottom of the liquid inlet header 8, it is guided through the liquid passing holes 91 provided downstream of the current liquid inlet holes 81. By the combined use of the liquid inlet holes 81 and the liquid passing holes 91 in the above setting manner, during the spiral flow of the fluid in the liquid inlet header 8, the fluid is preferentially made to flow into the corresponding channels to meet the heat exchange requirements, thereby further improving the heat exchange efficiency of the heat exchanger during use.

[0043] In the specific application process, the size of the liquid inlet holes 81 can be set according to the ratio between the total area of the liquid inlet holes 81 and the cross-sectional area of the liquid inlet header 8. For example, two circular liquid inlet holes 81 can be designed in each layer of the flow channels with liquid inlet holes in the spiral laminated flow channels, and the aperture of the liquid inlet holes 81 is set to be 0.5 - 3 mm. By setting the liquid inlet holes 81 with smaller sizes, it is avoided that more fluid flows out from the heat exchange channels closer to the liquid inlet 1, thereby balancing the flow rates of the heat exchange channels and making the fluid distribution more uniform.

[0044] The distribution structure provided by the embodiment of the present invention includes a liquid inlet header and a spiral flow disturbing plate arranged in the liquid inlet header; one end of the liquid inlet header is provided with liquid inlet holes; the outer edge of the spiral flow disturbing plate is fixedly connected to the inner wall of the liquid inlet header, and the spiral flow disturbing plate divides the internal cavity of the liquid inlet header to form a spiral laminated flow channel; a liquid passing hole is provided on one side of the spiral flow disturbing plate in contact with the liquid inlet header; a plurality of liquid inlet holes are provided on the side wall of the liquid inlet header, and the liquid inlet holes are all communicated with the spiral laminated flow channel; the liquid inlet holes are arranged at intervals in multiple layers of the spiral laminated flow channel.

[0045] That is to say, in the embodiment of the present invention, the fluid flows into the spiral laminated flow channel in a spiral shape and is evenly discharged outward from the liquid inlet holes under the action of centrifugal force. At the same time, the liquid passing holes are provided to avoid excessive fluid accumulation at the corresponding positions, resulting in uneven distribution, greatly reducing the pressure loss of the fluid and improving the uniformity of the fluid distribution, thereby being able to improve the heat exchange efficiency of the plate heat exchanger.

[0046] The embodiment of the present invention also provides a plate heat exchanger, such as Figure 1 and Figure 5As shown, the plate heat exchanger includes a heat exchanger body 10 and a distribution structure as described in the above embodiments; the heat exchanger body is composed of a front seal plate 6, a rear seal plate 5 and a plurality of heat exchange plates 7; the heat exchange plates 7 are stacked between the front seal plate 6 and the rear seal plate 5 to form a plurality of heat exchange channels; the distribution structure is arranged at one end of the heat exchange channels, and the spiral laminated flow channels of the distribution structure are intermittently communicated with the plurality of heat exchange channels through the liquid inlet holes 81; the other ends of the heat exchange channels communicated with the spiral laminated flow channels are communicated with the liquid outlet 2 of the heat exchanger body; the two ends of the heat exchange channels not communicated with the spiral laminated flow channels are respectively communicated with the water inlet 3 and the water outlet 4 of the heat exchanger body. Specifically, the spacing between the heat exchange channels is equal.

[0047] The heat exchanger body 10 of the plate heat exchanger includes heat exchange plates 7, a front seal plate 6, a rear seal plate 5, a liquid inlet 1, a liquid outlet 2, a water inlet 3, and a water outlet 4. The liquid inlet 1 of the distribution structure can also be used as the liquid inlet of the heat exchanger body 10, and fluid can be input into the heat exchanger body 10 through the liquid inlet 1 of the distribution structure. The heat exchange plates 7 are stacked between the front seal plate 6 and the rear seal plate 5, so heat exchange channels can be formed between the heat exchange plates 7 and adjacent other heat exchange plates, between the front seal plate 6 and adjacent heat exchange plates 7, and between the rear seal plate 5 and adjacent heat exchange plates 7. That is, a plurality of heat exchange plates 7 are stacked to form staggered two-fluid heat exchange channels. The heat exchange channels communicated with the spiral laminated flow channels are used to input hot fluid, and the heat exchange channels not communicated with the spiral laminated flow channels are used to input cold fluid. The hot fluid and the cold fluid flow in a staggered manner, thereby achieving efficient heat exchange.

[0048] Among them, the spiral laminated flow channels are intermittently communicated with the plurality of heat exchange channels through the liquid inlet holes 81, and the specific structure is as Figure 1 and Figure 2 shown. Each heat exchange channel for water inlet heat exchange is provided with a corresponding liquid inlet hole 81 to ensure that each heat exchange channel for water inlet heat exchange can receive liquid. The liquid inlet header 8 and the spiral flow baffle 9 are combined to form spiral laminated flow channels. After the fluid enters the distribution structure from the liquid inlet 1, it flows along the spiral laminated flow channels under the blocking and flow disturbing effects of the spiral flow baffle 9, and enters each heat exchange channel from the liquid inlet holes 81 under the action of centrifugal force.

[0049] For a plate heat exchanger provided with multiple heat exchange channels arranged in parallel, the uniformity of fluid distribution between the heat exchange channels directly affects the area utilization rate of each heat exchange plate 7 and the overall performance of the heat exchanger. For a phase change working fluid, due to the differences in physical properties and flow patterns of gas-liquid two-phase fluids, the problem of uneven distribution becomes more prominent, seriously restricting the improvement of the heat exchanger efficiency and increasing the application cost. The technical method of this application divides the internal space of the liquid inlet header 8 into spiral laminated channels through the spiral spoiler 9, so that the fluid flows spirally through the spiral laminated channels, and then tangentially enters the heat exchange channels more smoothly, avoiding the problem of large pressure loss caused by the traditional liquid inlet pipeline having to flow through a 90° corner pipeline before entering the heat exchange channel, and greatly reducing the pressure loss of the fluid; at the same time, by setting the liquid inlet holes 81, the fluid is evenly distributed and enters each heat exchange channel under the action of centrifugal force, solving the problem of uneven fluid distribution in the prior art method, improving the uniformity of fluid distribution by the distribution structure, and thus improving the heat exchange performance of the heat exchanger.

[0050] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0051] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A distribution structure, characterized in that, The distribution structure includes a liquid inlet header and a spiral flow spoiler disposed within the liquid inlet header; one end of the liquid inlet header is provided with a liquid inlet hole; The outer edge of the spiral flow spoiler is fixedly connected to the inner wall of the liquid inlet header, and the spiral flow spoiler divides the cavity inside the liquid inlet header to form a spiral laminated flow channel; a liquid passing hole is provided on one side of the spiral flow spoiler in contact with the liquid inlet header; The side wall of the liquid inlet header is provided with a plurality of liquid inlet holes, and the liquid inlet holes are all communicated with the spiral laminated flow channel; The liquid inlet holes are arranged at intervals in the multiple flow channels of the spiral laminated flow channel; The liquid passing holes are arranged at the bottom of the liquid inlet header and arranged along the axial direction of the liquid inlet header.

2. The dispensing structure according to claim 1, wherein The setting height of the liquid passing holes is 0.01 to 0.1 times the diameter of the liquid inlet header.

3. The dispensing structure according to claim 1, wherein At least two of the liquid inlet holes are provided in each flow channel of the spiral laminated flow channel where the liquid inlet holes are provided.

4. The dispensing structure according to claim 3, characterized in that, The liquid inlet holes are all arranged within a first included angle range, and the first included angle range is a range with an included angle of 60° with the plumb line in the cross-sectional direction of the liquid inlet header.

5. The dispensing structure according to claim 4, characterized in that, The ratio of the total area of the liquid inlet holes to the cross-sectional area of the liquid inlet header is 0.1 to 0.

5.

6. The dispensing structure according to claim 5, characterized in that, The liquid inlet holes are all arranged close to the liquid passing holes.

7. The dispensing structure according to claim 5 or 6, characterized in that The liquid inlet holes are arranged upstream of the liquid passing holes of the subsequent flow channel in the fluid flow direction, and the fluid flow direction is the direction in which the fluid flows in the spiral laminated flow channel.

8. A plate heat exchanger, characterized in that, The plate heat exchanger includes a heat exchanger main body and the distribution structure according to any one of claims 1-7; The heat exchanger main body is composed of a front seal plate, a rear seal plate and a plurality of heat exchange plates; the heat exchange plates are stacked between the front seal plate and the rear seal plate to form a plurality of heat exchange channels; The distribution structure is arranged at one end of the heat exchange channel, and the spiral laminated flow channel of the distribution structure is intermittently communicated with the plurality of heat exchange channels through the liquid inlet holes; the other end of the heat exchange channel communicated with the spiral laminated flow channel is communicated with the liquid outlet of the heat exchanger main body; Both ends of the heat exchange channel not communicated with the spiral laminated flow channel are communicated with the water inlet and the water outlet of the heat exchanger main body respectively.

9. The plate heat exchanger according to claim 8, characterized in that, The spacings of the heat exchange channels are all equal.

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