A plate heat exchanger

Abstract

The application relates to the technical field of heat exchangers, and particularly discloses a plate heat exchanger, which comprises a heat exchange shell and first heat exchange plates and second heat exchange plates; cold flow inlet water inlets, cold flow outlet water outlets, hot flow inlet water inlets and hot flow outlet water outlets are arranged at each top corner of the surfaces of the first heat exchange plates and the second heat exchange plates; the cold flow inlet water inlets and the cold flow outlet water outlets of the first heat exchange plates and the second heat exchange plates are coaxially arranged and form cold flow channels; the hot flow inlet water inlets and the hot flow outlet water outlets of the first heat exchange plates and the second heat exchange plates are coaxially arranged and form hot flow channels; cold flow filters and hot flow filters are arranged on the two sides of the heat exchange shell; and the water inlets and the water outlets of the cold flow filters are respectively connected with the two ends of the cold flow channels through pipes. The application reduces the occurrence of air blockage, guarantees the full utilization of heat exchange area and improves the stability of heat exchange efficiency.

Description

Technical Field

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

[0002] Plate heat exchangers, as highly efficient heat exchange equipment, are widely used in HVAC, industrial cooling, food processing, chemical production, and other fields, offering advantages such as high heat exchange efficiency, compact structure, small footprint, and flexible adjustment of heat exchange area. However, in actual long-term operation, clogging remains the core bottleneck restricting the stable and reliable operation of plate heat exchangers.

[0003] The heat exchange medium inevitably carries solid impurities such as silt, welding slag, fibrous flocs, and scale particles. Plate heat exchangers have narrow and complex flow channels, making them prone to impurity deposition and accumulation at corners and low-speed zones, gradually clogging the channels. Channel blockage leads to a significant decrease in the effective utilization rate of the heat exchange area, a marked reduction in heat exchange efficiency, and a substantial increase in energy consumption. In severe cases, it can cause complete blockage of local channels, creating heat exchange dead zones and forcing a complete shutdown for maintenance, severely impacting the continuity of production. Furthermore, long-term adhesion of impurities to the heat exchange plate surface accelerates plate corrosion and scaling, further exacerbating the blockage problem and significantly shortening the equipment's lifespan.

[0004] Existing technologies typically use external independent filters at the inlet and outlet of the heat exchanger to intercept impurities. However, external filters not only increase the overall footprint and installation and maintenance costs of the equipment, but the filters themselves are also prone to clogging, requiring frequent shutdowns for disassembly and cleaning, which also cannot guarantee the continuity of production. At the same time, there are many connecting pipes between the external filter and the heat exchanger, which increases the risk of media leakage and cannot fundamentally solve the problem of impurities entering the heat exchanger.

[0005] Therefore, there is an urgent need to develop an integrated plate heat exchanger that can effectively solve the clogging problem, operate stably and reliably, and has low maintenance costs. Summary of the Invention

[0006] This application provides a plate heat exchanger that solves the problem of easy clogging in existing plate heat exchangers, reduces the occurrence of air blockage, ensures full utilization of the heat exchange area, and improves the stability of heat exchange efficiency.

[0007] In a first aspect, embodiments of the present invention provide a plate heat exchanger, comprising: a heat exchange shell, and a first heat exchange plate and a second heat exchange plate, wherein multiple first heat exchange plates and multiple second heat exchange plates are provided, and the multiple first heat exchange plates and second heat exchange plates are vertically and alternately stacked within the heat exchange shell; each of the top corners of the surface of each of the first heat exchange plates and the second heat exchange plates is provided with a cold flow inlet, a cold flow outlet, a hot flow inlet, and a hot flow outlet, and each of the cold flow inlets and cold flow outlets of each of the first heat exchange plates and the second heat exchange plates is coaxially arranged to form a cold flow channel; each of the hot flow inlets and hot flow outlets of each of the first heat exchange plates and the second heat exchange plates is coaxially arranged to form a hot flow channel; a cold flow filter and a hot flow filter are respectively provided on both sides of the heat exchange shell; wherein the inlet and outlet of the cold flow filter are respectively pipe-connected to both ends of the cold flow channel; the inlet and outlet of the hot flow filter are respectively pipe-connected to both ends of the hot flow channel.

[0008] In one possible implementation, both the cold flow filter and the hot flow filter include: a filtration mechanism, the filtration mechanism including: a filter box, vertically arranged on one side of the heat exchange shell; multiple raised columns arranged in a frame-like array on the inner wall of the filter box; and a grille disposed inside the filter box and installed on each of the raised columns; wherein the side of the grille closest to the raised column is a clean water zone, and the clean water zone is connected to the inlet of the cold flow channel; the side of the grille furthest from the raised column is a filtration zone, and the filtration zone is connected to the outlet of the cold flow channel / hot flow channel.

[0009] In one possible implementation, the cold flow filter and the hot flow filter further include a cleaning mechanism, which includes: a first Z-shaped rod, one end of which passes through the filter box and is connected to a drive motor; a U-shaped frame, having three sets of horizontally spaced first crossbeams and two sets of vertically spaced first longitudinal beams, with the bottom first crossbeam rotatably connected to the other end of the first Z-shaped rod; a U-shaped frame, having two sets of horizontally spaced second crossbeams and two sets of vertically spaced second longitudinal beams; wherein the two sets of second longitudinal beams are U-shaped, with their ends respectively connected to the ends of the two sets of second crossbeams, and the U-shaped second crossbeams are located on the side of the U-shaped frame away from the grid, and the two sets of first longitudinal beams pass through the two sets of second crossbeams; the U-shaped frame slides vertically back and forth on one side of the U-shaped frame; two sets of transverse guide rails are spaced apart and installed inside the filter box, with the two sets of transverse guide rails respectively passing through the two sets of second longitudinal beams; the U-shaped frame slides laterally back and forth on the two sets of transverse guide rails; and multiple scraping brushes, which are respectively installed laterally on the side of each first crossbeam near the grid.

[0010] In one possible implementation, the cold flow filter and the hot flow filter further include a temperature homogenizing device, which includes: a mixing chamber installed between the two sets of second longitudinal beams of the orifice frame; and a water lifting pipe, one end of which is arranged on the bottom surface of the filter chamber and connected to the outlet of the cold flow channel / hot flow channel, and the other end of which is connected to the bottom of the mixing chamber.

[0011] In one possible implementation, the temperature homogenizing device further includes: a plurality of water intake piston assemblies, which are spaced apart within the mixing chamber; the water intake piston assembly includes: a piston cylinder mounted on the top surface of the mixing chamber; wherein the bottom of the piston cylinder is provided with a one-way valve for water inlet; a piston plate slidably disposed within the piston cylinder; a drive rod vertically disposed, one end of which passes through the mixing chamber and connects to the piston plate, and the other end is mounted on the first crossbeam at the top of the frame; a water supply pipe, one end of which is connected to each of the piston cylinders via a one-way valve for water outlet; and a strip nozzle disposed at the other end of the water supply pipe, with the outlet facing the grid.

[0012] In one possible implementation, the cold flow filter and the hot flow filter further include an antiscaling agent adding mechanism, which includes: a handle-mounted disc-shaped structure, one end of which is hinged to the first crossbeam located in the middle of the H-shaped frame, and one end of which falls freely; a mixing chamber, opened on the disc end surface of the handle-mounted disc-shaped structure; wherein the mixing chamber is respectively pipe-connected to the strip nozzle and the descaling agent storage tank; a sealing plate, rotatably installed on the open end of the mixing chamber; a strip groove, opened on the outer wall of the sealing plate; a strip slider, slidably disposed in the strip groove; a second Z-shaped rod, one end of which is hinged to the side of the strip slider away from the strip groove; a bracket, horizontally installed between the two sets of second longitudinal beams of the H-shaped frame; the other end of the second Z-shaped rod is hinged to the middle of the bracket; and a spiral stirring bar, arranged on the side of the sealing plate near the mixing chamber.

[0013] In one possible implementation, both the first heat exchange plate and the second heat exchange plate include: a heat exchange plate body, the heat exchange plate body including: a substrate, the substrate having circular holes at its four apex corners, each circular hole forming a cold water inlet, a cold water outlet, a hot water inlet, and a hot water outlet; an annular protrusion integrally formed around the periphery of the substrate, the annular protrusion having a rubber sealing gasket embedded therein; the surface of the substrate having a herringbone-shaped heat exchange corrugated area, with a flow guiding area between the two sides of the herringbone-shaped heat exchange corrugated area and the corresponding circular hole, and multiple strip-shaped flow guiding protrusions arranged at intervals within the flow guiding area; two circular holes located at one diagonal of the substrate being a cold water inlet and a hot water inlet, respectively; two circular holes located at another diagonal of the substrate being a cold water outlet and a hot water outlet, respectively; adjacent first heat exchange plates and second heat exchange plates are sealed together by the rubber sealing gasket, forming independent cold flow chambers and hot flow chambers.

[0014] In one possible implementation, the first heat exchange plate and the second heat exchange plate further include: a spiral turbulence assembly, respectively disposed in the cold water inlet and the hot water inlet of each of the substrates; the spiral turbulence assembly includes: an arc-shaped turbulence plate, of which a plurality of arc-shaped turbulence plates are arranged in a ring array on the inner wall of the cold water inlet and the hot water inlet; and a reinforcing ring, which is connected in series with each of the arc-shaped turbulence plates.

[0015] In one possible implementation, an automatic slag discharge mechanism is further provided on one side of the filter box. The automatic slag discharge mechanism includes: a slag discharge box, disposed on the outer wall of the heat exchange shell; a drain hole, which is L-shaped, with one end penetrating the surface of the substrate and the other end penetrating the side wall of the substrate and the outer wall of the heat exchange shell and communicating with the slag discharge box; wherein one end of the drain hole is located near the cold water outlet and the hot water outlet; and a valve plate is disposed at the end of the drain hole near the slag discharge box; wherein one end of the valve plate is welded to the side wall of the substrate.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: This invention integrates the cold flow filter and the hot flow filter directly onto both sides of the heat exchanger shell, solving the problem in existing technologies where plate heat exchangers and filters are independent and require separate installation and piping connections. This significantly reduces the overall footprint of the equipment and lowers installation and maintenance costs. Simultaneously, the integrated structure reduces pipe connection points, lowers the risk of media leakage, and improves the reliability of equipment operation. The pre-installed cold flow filter and hot flow filter effectively intercept solid impurities in the heat exchange medium, preventing impurities from entering the heat exchanger plate channels and causing blockages, extending the continuous operating time of the heat exchanger, and reducing the frequency of downtime for disassembly and cleaning. Furthermore, the vertically alternating stacking of the first and second heat exchange plates allows the heat exchange medium to fill the entire channel under gravity, reducing air blockage, ensuring full utilization of the heat exchange area, and improving the stability of heat exchange efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the heat exchanger structure provided in an embodiment of this application; Figure 2This is a schematic diagram of the heat exchange plate body structure provided in an embodiment of this application; Figure 3 for Figure 2 Enlarged view of region A in the middle; Figure 4 This is a schematic diagram of the filter mechanism structure provided in an embodiment of this application; Figure 5 This is a schematic diagram of the cleaning mechanism structure provided in an embodiment of this application; Figure 6 This is a schematic diagram of the temperature homogenizing device provided in an embodiment of this application; Figure 7 This is a schematic diagram of the support structure provided in an embodiment of this application; Figure 8 This is a schematic diagram of the antiscalant adding mechanism provided in an embodiment of this application.

[0019] icon: 100 - Heat exchanger shell; 200a - First heat exchange plate; 200b - Second heat exchange plate; 210 - Heat exchanger plate body; 211-Substrate; 212-Round hole; 213-Annular protrusion; 214-Rubber sealing gasket; 215-Herringbone heat exchange corrugated area; 216-Strip-shaped flow guide boss; 220-Helical spoiler assembly; 221 - Arc-shaped spoiler; 222 - Reinforcing ring; 300a - Cold water inlet; 300b - Cold water outlet; 300c - Hot water inlet; 300d - Hot water outlet; 400 - Filter mechanism; 410 - Filter box; 420 - Elevating column; 430 - Grille; 500 - Cleaning Agency; 510 - First Z-shaped bar; 520 - H-shaped frame; 521 - First crossbeam; 522 - First longitudinal beam; 530 - Mouth-shaped frame; 531 - Second crossbeam; 532 - Second longitudinal beam; 540 - Transverse guide rail; 550 - Scraping brush; 600-Temperature homogenizer; 610 - Mixing box; 620 - Water lifting pipe; 630 - Water intake piston assembly; 631 - Piston cylinder; 632 - Piston plate; 633 - Drive rod; 634 - Water delivery pipe; 635 - Strip nozzle; 700 - Anti-scaling agent addition mechanism; 710 - Handled disc structure; 720 - Sealing plate; 730 - Strip groove; 740 - Strip slider; 750 - Second Z-shaped rod; 760 - Support; 770 - Spiral stirring bar; 800 - Automatic slag discharge mechanism; 810 - Slag discharge box; 820 - Sewage discharge hole; 830 - Valve plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, 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. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0022] Example 1 Please see Figures 1 to 8A plate heat exchanger includes: a heat exchange shell 100, and a first heat exchange plate 200a and a second heat exchange plate 200b, wherein multiple first heat exchange plates 200a and second heat exchange plates 200b are provided, and multiple first heat exchange plates 200a and second heat exchange plates 200b are vertically and alternately stacked within the heat exchange shell 100; each of the top corners of the surface of each first heat exchange plate 200a and second heat exchange plate 200b is provided with a cold flow inlet 300a, a cold flow outlet 300b, a hot flow inlet 300c, and a hot flow outlet 300d. The cold flow inlets 300a and cold flow outlets 300b of the hot plate 200a and the second heat exchange plate 200b are coaxially arranged to form a cold flow channel; the hot flow inlets 300c and hot flow outlets 300d of the first heat exchange plate 200a and the second heat exchange plate 200b are coaxially arranged to form a hot flow channel; a cold flow filter and a hot flow filter are respectively disposed on both sides of the heat exchange shell 100; wherein the inlet and outlet of the cold flow filter are respectively pipe-connected to both ends of the cold flow channel; the inlet and outlet of the hot flow filter are respectively pipe-connected to both ends of the hot flow channel.

[0023] In the above embodiments, when the plate heat exchanger is working, the cold heat exchange medium enters from the inlet of the cold flow channel, and after being distributed by the cold flow channel, flows sequentially through the cold flow channels formed between each of the first heat exchange plates 200a and the second heat exchange plates 200b; the hot heat exchange medium enters from the inlet of the hot flow channel, and after being distributed by the hot flow channel, flows sequentially through the hot flow channels formed between each of the first heat exchange plates 200a and the second heat exchange plates 200b. The cold and hot heat exchange media transfer heat through the substrate 211 of the first heat exchange plates 200a and the second heat exchange plates 200b. After the heat exchange is completed, the cold heat exchange medium flows out from the outlet of the cold flow channel, and the hot heat exchange medium flows out from the outlet of the hot flow channel. Before the heat exchange medium enters the cold flow channel and the hot flow channel, it first flows through the cold flow filter and the hot flow filter, respectively. The cold flow filter and the hot flow filter pre-intercept solid impurities such as mud, welding slag, and fibers carried in the heat exchange medium, preventing impurities from entering the flow channels between the heat exchange plates and causing blockage. The cold flow filter and the hot flow filter are integrated on both sides of the heat exchange shell 100, forming an integral structure with the heat exchange shell 100. The heat exchange medium flows directly between the filter and the heat exchanger, without the need for additional long-distance connecting pipelines.

[0024] This embodiment solves the problem of existing plate heat exchangers and filters being independent and requiring separate installation and piping by directly integrating the cold flow filter and hot flow filter on both sides of the heat exchange shell 100. This significantly reduces the overall footprint of the equipment and lowers installation and maintenance costs. Simultaneously, the integrated structure reduces pipe connection points, lowers the risk of media leakage, and improves the reliability of equipment operation. The pre-installed cold flow filter and hot flow filter effectively intercept solid impurities in the heat exchange medium, preventing impurities from entering the heat exchange plate channels and causing blockages, extending the continuous operating time of the heat exchanger, and reducing the number of shutdowns for disassembly and cleaning. Furthermore, the vertically alternating stacking of the first heat exchange plate 200a and the second heat exchange plate 200b allows the heat exchange medium to fill the entire channel under gravity, reducing air blockage, ensuring full utilization of the heat exchange area, and improving the stability of heat exchange efficiency.

[0025] Example 2 Please see Figures 1 to 8 Both the cold flow filter and the hot flow filter include a filtration mechanism 400, which includes: a filter box 410, vertically arranged on one side of the heat exchange shell 100; multiple raised columns 420 arranged in a frame-like array on the inner wall of the filter box 410; and a grille 430 disposed inside the filter box 410 and installed on each of the raised columns 420. The side of the grille 430 closest to the raised column 420 is a clean water zone, which is connected to the inlet of the cold flow channel. The side of the grille 430 furthest from the raised column 420 is a filtration zone, which is connected to the outlet of the cold flow channel / hot flow channel.

[0026] In the above embodiment, the heat exchange medium enters the filtration zone of the filter box 410 from the outlet of the cold flow channel or the hot flow channel. Under pressure, the heat exchange medium flows towards the grid 430, passing through the pores of the grid 430 and entering the clean water zone. Solid impurities carried in the heat exchange medium are intercepted on the surface of the grid 430 away from the raised pillars 420. The filtered heat exchange medium in the clean water zone flows into the heat exchanger from the inlet of the cold flow channel to participate in heat exchange. Multiple raised pillars 420 arranged in a frame-like array separate the grid 430 from the inner wall of the filter box 410, forming a stable clean water zone space, ensuring that the heat exchange medium in the clean water zone can flow evenly and smoothly enter the heat exchanger. When a certain amount of impurities accumulate on the surface of the grid 430, the cleaning mechanism 500 cleans the surface of the grid 430. The cleaned impurities are deposited at the bottom of the filter box 410 and periodically discharged through the drain port.

[0027] In this embodiment, the grille 430 is suspended within the filter box 410 by the raised columns 420, forming independent filtration and purification zones. This ensures the stability of the filtration process and avoids the problem of reduced filtration area caused by the grille 430 adhering to the inner wall of the filter box 410. The frame array of raised columns 420 provides uniform and stable support for the grille 430, preventing deformation under media pressure and extending its service life. This filtration structure ensures that all impurities are intercepted on the same side surface of the grille 430, facilitating centralized cleaning by the subsequent cleaning mechanism 500 and preventing impurities from flowing into the heat exchanger with the media and causing blockages. Furthermore, the grille 430 is detachable, allowing for quick disassembly and replacement when damaged or requiring replacement, without disassembling the entire filter mechanism 400, significantly reducing maintenance difficulty and costs.

[0028] Example 3 Please see Figures 1 to 8 The cold flow filter and the hot flow filter further include a cleaning mechanism 500, which includes: a first Z-shaped rod 510, one end of which passes through the filter box 410 and is connected to a drive motor; a U-shaped frame 520, having three sets of horizontally spaced first crossbeams 521 and two sets of vertically spaced first longitudinal beams 522, with the bottommost first crossbeam 521 rotatably connected to the other end of the first Z-shaped rod 510; and a U-shaped frame 530, having two sets of horizontally spaced second crossbeams 531 and two sets of vertically spaced second longitudinal beams 532; wherein the two sets of second longitudinal beams 532 are U-shaped, and their ends are respectively connected to the two sets of the first Z-shaped rod 510. The second crossbeam 531, which is U-shaped, is located at the end of the second crossbeam 531 on the side of the H-shaped frame 520 away from the grid 430. Two sets of first longitudinal beams 522 are arranged through the two sets of second crossbeams 531. The H-shaped frame 520 slides vertically back and forth on one side of the H-shaped frame 530. Two sets of transverse guide rails 540 are provided at intervals and installed in the filter box 410. The two sets of transverse guide rails 540 are respectively arranged through the two sets of second longitudinal beams 532. The H-shaped frame 530 slides horizontally back and forth on the two sets of transverse guide rails. Multiple scraping brushes 550 are provided and are respectively installed horizontally on the side of each first crossbeam 521 near the grid 430.

[0029] In the above embodiment, when the grille 430 needs to be cleaned, the drive motor starts and drives the first Z-shaped rod 510 to rotate. The first Z-shaped rod 510 is rotatably connected to the first crossbeam 521 at the bottom of the H-shaped frame 520, forming a crank-slider mechanism. When the first Z-shaped rod 510 rotates, it drives the H-shaped frame 520 to slide vertically back and forth along the second longitudinal beam 532 of the mouth-shaped frame 530. At the same time, the mouth-shaped frame 530 is slidably connected to two sets of transverse guide rails 540 in the filter box 410 through two sets of second longitudinal beams 532. Driven by the first Z-shaped rod 510, the mouth-shaped frame 530 slides laterally back and forth along the transverse guide rails 540. The scraping brushes 550, installed on the side of the first crossbeams 521 of the frame 520 near the grid 430, move vertically and horizontally simultaneously with the frame 520 and the frame 530, forming a planar sweeping trajectory that fully covers the entire surface of the grid 430, scraping off hair, fibers, sand, and other impurities adhering to the surface of the grid 430. After cleaning, the drive motor stops rotating, and the scraping brushes 550 remain at the edge of the filter box 410, without affecting the normal operation of the filtration process.

[0030] The first Z-shaped rod 510 drives the H-shaped frame 520 and the O-shaped frame 530 to achieve a dual-axis linkage planar cleaning motion, solving the problem of cleaning dead corners and inability to fully cover the surface of the grille 430 in traditional rotary cleaning mechanisms 500, thus ensuring the cleaning effect of the grille 430. This cleaning mechanism 500 can automatically complete the cleaning of the grille 430 without manual intervention, realizing manual maintenance of the filter and significantly reducing the labor intensity of operators. At the same time, the cleaning process does not require machine shutdown and does not affect the normal operation of the heat exchanger, ensuring the continuity of the production process. In addition, multiple scraping brushes 550 are installed on different first crossbeams 521, which can clean different areas of the grille 430 simultaneously, improving cleaning efficiency and shortening the cleaning time.

[0031] Example 4 Please see Figures 1 to 8 The cold flow filter and the hot flow filter also include a temperature homogenizing device 600, which includes: a mixing box 610, installed between the two sets of second longitudinal beams 532 of the orifice frame 530; and a water lifting pipe 620, one end of which is arranged on the bottom surface of the filter box 410 and connected to the outlet of the cold flow channel / hot flow channel, and the other end of which is connected to the bottom of the mixing box 610.

[0032] In the above embodiment, the temperature homogenizing device 600 moves laterally back and forth along the transverse guide rail 540 together with the orifice frame 530. One end of the water lifting pipe 620 is arranged on the bottom surface of the filter box 410, and the other end is connected to the bottom of the mixing box 610. During the laterally reciprocating motion of the orifice frame 530, the water lifting pipe 620 sequentially draws heat exchange medium from different positions in the filter box 410, transporting heat exchange mediums of different temperatures into the mixing box 610. The heat exchange mediums of different temperatures are fully mixed in the mixing box 610, eliminating local temperature differences in the heat exchange medium and making the temperature of the heat exchange medium entering the heat exchanger uniform. The uniformly mixed heat exchange medium flows out of the mixing box 610, enters the heat exchanger through the clean water zone to participate in heat exchange, ensuring that the temperature of the heat exchange medium in each flow channel of the heat exchanger is the same and avoiding the problem of uneven heat exchange caused by excessive local temperature differences.

[0033] This embodiment solves the problem of unstable heat exchange efficiency caused by localized temperature differences before the heat exchange medium enters the heat exchanger in the prior art by setting up a temperature homogenization device 600. The temperature homogenization device 600 moves together with the orifice frame 530 of the cleaning mechanism 500, and can extract and mix the heat exchange medium at different positions in the filter box 410, completely eliminating the temperature stratification phenomenon in the heat exchange medium and ensuring that the temperature of the heat exchange medium entering the heat exchanger is uniform. The uniform medium temperature ensures that the heat exchange load of each flow channel of the heat exchanger is consistent, avoiding local overheating or local undercooling, reducing deformation and damage to the heat exchange plates caused by temperature stress, and extending the service life of the heat exchanger. At the same time, the uniform heat exchange process improves the overall heat exchange efficiency and reduces energy consumption.

[0034] Example 5 Please see Figures 1 to 8 The temperature homogenizing device 600 further includes: a plurality of water intake piston assemblies 630, which are spaced apart within the mixing tank 610; the water intake piston assembly 630 includes: a piston cylinder 631, installed on the top surface of the mixing tank 610; wherein the bottom of the piston cylinder 631 is provided with a water inlet check valve; a piston plate 632, slidably disposed within the piston cylinder 631; a drive rod 633, vertically arranged, one end of which passes through the mixing tank 610 and connects to the piston plate 632, and the other end is installed on the first crossbeam 521 at the top of the frame 520; a water supply pipe 634, one end of which is connected to each piston cylinder 631 through a water outlet check valve; and a strip nozzle 635, disposed at the other end of the water supply pipe 634, with the outlet facing the grille 430.

[0035] In the above embodiment, when the H-shaped frame 520 slides vertically back and forth along the U-shaped frame 530, the drive rod 633 installed on the top first crossbeam 521 of the H-shaped frame 520 moves up and down with the H-shaped frame 520, thereby driving the piston plate 632 to slide vertically back and forth within the piston cylinder 631. When the piston plate 632 moves upward, a negative pressure is formed inside the piston cylinder 631, the inlet check valve opens, and the uniformly mixed heat exchange medium in the mixing tank 610 is drawn into the piston cylinder 631; when the piston plate 632 moves downward, the pressure inside the piston cylinder 631 increases, the inlet check valve closes, the outlet check valve opens, and the heat exchange medium in the piston cylinder 631 is forced into the water delivery pipe 634, and finally sprayed out from the strip nozzle 635. The outlet of the strip nozzle 635 is set towards the grille 430. The high-pressure water jet can wash the surface of the grille 430 and wash away stubborn impurities that are difficult to remove by the scraper brush 550, thus assisting the scraper brush 550 in completing the cleaning work of the grille 430.

[0036] This embodiment utilizes the vertical reciprocating motion of the H-shaped frame 520 in the cleaning mechanism 500 as the power source for the water intake piston assembly 630, eliminating the need for an additional independent drive device, simplifying the equipment structure, and reducing manufacturing costs and operating energy consumption. High-pressure water jets sprayed through the strip nozzles 635 assist in cleaning the grille 430, effectively removing stubborn impurities embedded in the grille 430's pores. This solves the problem that the scraper brush 550 alone cannot thoroughly clean the grille 430, further improving the cleaning effect. Simultaneously, the sprayed water jets can flush the impurities scraped off by the scraper brush 550 to the bottom of the filter box 410, facilitating the centralized collection and discharge of impurities and preventing them from re-adhering to the surface of the grille 430 and causing secondary blockage.

[0037] Example 6 Please see Figures 1 to 8 The cold flow filter and the hot flow filter further include an antiscaling agent adding mechanism 700, which includes: a handle-mounted disc-shaped structure 710, one end of which is hinged to the first crossbeam 521 located in the middle of the H-shaped frame 520, and one end of which falls freely; a mixing chamber, which is opened on the disc end surface of the handle-mounted disc-shaped structure 710; wherein the mixing chamber is respectively connected to the strip nozzle 635 and the descaling agent storage tank; a sealing plate 720, which is rotatably installed on the open end of the mixing chamber; a strip groove 730, which is opened on the outer wall of the sealing plate 720; a strip slider 740, which is slidably disposed in the strip groove 730; a second Z-shaped rod 750, one end of which is hinged to the side of the strip slider 740 away from the strip groove 730; and a bracket 760, which is horizontally installed between the two sets of second longitudinal beams 532 of the H-shaped frame 530; the other end of the second Z-shaped rod 750 is hinged to the middle of the bracket 760.

[0038] In the above embodiment, when the sun-shaped frame 520 slides vertically and the mouth-shaped frame 530 slides laterally, the handle-bearing disc-shaped structure 710, hinged to the first crossbeam 521 in the middle of the sun-shaped frame 520, moves together with the sun-shaped frame 520 and the mouth-shaped frame 530. The second Z-shaped rod 750, hinged to the middle of the bracket 760, is slidably connected to the strip groove 730 on the sealing plate 720 through the strip slider 740. During the movement of the handle-bearing disc-shaped structure 710, the second Z-shaped rod 750 drives the strip slider 740 to slide along the strip groove 730, thereby driving the sealing plate 720 to rotate around its hinge axis with the mixing chamber, opening the opening of the mixing chamber. The anti-scaling agent flows from the descaling agent storage tank into the mixing chamber and mixes thoroughly with the heat exchange medium flowing into the mixing chamber from the strip nozzle 635. The heat exchange medium mixed with the anti-scaling agent is finally sprayed out from the strip nozzle 635 and enters the heat exchanger along with the heat exchange medium, forming a protective film on the surface of the heat exchange plate to prevent calcium and magnesium ions from crystallizing and forming scale on the surface of the heat exchange plate.

[0039] This embodiment utilizes the movement of the cleaning mechanism 500 as the power source for the anti-scaling agent addition mechanism 700, eliminating the need for an additional dosing pump and complex control system. This achieves automatic quantitative addition of the anti-scaling agent, simplifying the equipment structure and reducing operating costs. The anti-scaling agent and heat exchange medium are thoroughly mixed in the mixing chamber, ensuring uniform distribution of the anti-scaling agent within the heat exchange medium and improving the anti-scaling effect. By adding the anti-scaling agent to the heat exchange medium, the formation of hard scale on the surface of the heat exchange plates can be effectively inhibited, maintaining the heat exchange efficiency of the heat exchange plates, extending the service life of the heat exchanger, reducing the frequency of chemical cleaning, lowering maintenance costs, and avoiding corrosion damage to the heat exchange plates caused by chemical cleaning.

[0040] Example 7 Please see Figures 1 to 8Both the first heat exchange plate 200a and the second heat exchange plate 200b include: a heat exchange plate body 210, the heat exchange plate body 210 including: a substrate 211, the substrate 211 having circular holes 212 at its four apex corners, each of the circular holes 212 forming the cold water inlet 300a, cold water outlet 300b, hot water inlet 300c, and hot water outlet 300d; an annular protrusion 213 integrally formed around the periphery of the substrate 211, the annular protrusion 213 having a rubber sealing gasket 214 embedded therein; the surface of the substrate 211 having a herringbone heat exchange corrugated area 215, the two sides of the herringbone heat exchange corrugated area 215 A flow guiding area is provided between the side and the corresponding circular hole 212, and multiple strip-shaped flow guiding protrusions 216 are arranged at intervals in the flow guiding area; two circular holes 212 located on one diagonal of the substrate 211 are respectively a cold flow inlet 300a and a hot flow inlet 300c; two circular holes 212 located on another diagonal of the substrate 211 are respectively a cold flow outlet 300b and a hot flow outlet 300d; adjacent first heat exchange plate 200a and second heat exchange plate 200b are sealed by the rubber sealing gasket 214 to form independent cold flow chambers and hot flow chambers; a spiral stirring strip 770 is arranged on the side of the sealing plate 720 near the mixing chamber.

[0041] In the above embodiments, the cold heat exchange medium enters from the cold inlet 300a, is evenly distributed by the strip-shaped guide protrusions 216 in the guide zone, and then enters the herringbone heat exchange corrugated zone 215. There, it exchanges heat with the hot heat exchange medium in the hot flow channel through the substrate 211. After heat exchange, it flows out from the cold outlet 300b. The hot heat exchange medium enters from the hot inlet 300c, is evenly distributed by the strip-shaped guide protrusions 216 in the guide zone, and then enters the herringbone heat exchange corrugated zone 215. There, it exchanges heat with the cold heat exchange medium in the cold flow channel. After heat exchange, it flows out from the hot outlet 300d. Adjacent first heat exchange plates 200a and second heat exchange plates 200b are sealed with rubber gaskets 214, completely separating the cold flow cavity and the hot flow cavity to prevent cross-contamination between the cold and hot heat exchange media. The annular protrusion 213 around the substrate 211 provides mounting positioning for the rubber sealing gasket 214, ensuring the reliability of the seal.

[0042] This embodiment effectively enhances the turbulence of the heat exchange medium by setting a herringbone-shaped heat exchange corrugated area 215 on the surface of the heat exchange plate, breaking the laminar boundary layer of the fluid and significantly improving heat exchange efficiency. The strip-shaped guide protrusions 216 within the guide zone evenly distribute the heat exchange medium throughout the corrugated area, preventing flow deviation and ensuring full utilization of the heat exchange area. The installation method of embedding the rubber sealing gasket 214 within the annular protrusion 213 improves the reliability and stability of the seal, preventing medium leakage and cross-contamination. Furthermore, the first heat exchange plate 200a and the second heat exchange plate 200b adopt the same structural design, improving the versatility of parts, reducing processing and manufacturing costs, and facilitating mass production and subsequent replacement.

[0043] Example 8 Please see Figures 1 to 8 The first heat exchange plate 200a and the second heat exchange plate 200b further include: a spiral turbulence assembly 220, which is respectively disposed in the cold water inlet 300a and the hot water inlet 300c of each of the substrates 211; the spiral turbulence assembly 220 includes: an arc-shaped turbulence plate 221, which is provided in a plurality of positions, and the plurality of arc-shaped turbulence plates 221 are arranged in a ring array on the inner wall of the cold water inlet 300a and the hot water inlet 300c; and a reinforcing ring 222, which is connected in series with each of the arc-shaped turbulence plates 221.

[0044] In the above embodiments, when the heat exchange medium enters the cold flow inlet 300a and the hot flow inlet 300c, it first flows through the spiral turbulence assembly 220. The arc-shaped turbulence plates 221, arranged in a ring array, guide the heat exchange medium to form a swirling flow state. The reinforcing ring 222 connects and fixes each arc-shaped turbulence plate 221 in series, ensuring the structural strength of the spiral turbulence assembly 220 and preventing the arc-shaped turbulence plates 221 from deforming under the pressure of the medium. After the swirling heat exchange medium enters the inter-plate flow channel, it can further enhance the turbulence effect, break the laminar boundary layer on the surface of the heat exchange plate, and enhance heat transfer. At the same time, the swirling heat exchange medium can be more evenly distributed to each inter-plate flow channel, further reducing the occurrence of flow deviation and ensuring that the heat exchange load of each flow channel is consistent.

[0045] This embodiment further enhances the turbulence of the heat exchange medium and improves the overall heat exchange efficiency of the heat exchanger by incorporating spiral turbulence components 220 within the cold inlet 300a and hot inlet 300c. The spiral turbulence components 220 pre-uniform the heat exchange medium entering the corner holes, ensuring a more even distribution of the medium across the inter-plate channels. This avoids problems such as excessively fast or slow flow velocities in local channels, reducing the risk of localized sludge accumulation and scaling. The reinforcing ring 222 improves the structural strength and stability of the spiral turbulence components 220, extending their service life. Furthermore, the modular design of the spiral turbulence components 220 facilitates installation and replacement without altering the overall structure of the heat exchange plates, demonstrating good versatility.

[0046] Example 9 Please see Figures 1 to 8 The filter box 410 is also provided with an automatic slag discharge mechanism 800 on one side. The automatic slag discharge mechanism 800 includes: a slag discharge box 810, which is located on the outer wall of the heat exchange shell 100; a drain hole 820, which is L-shaped, with one end of the L-shaped drain hole 820 penetrating the surface of the substrate 211 and the other end penetrating the side wall of the substrate 211 and the outer wall of the heat exchange shell 100 and communicating with the slag discharge box 810; wherein one end of the drain hole 820 is located near the cold water outlet 300b and the hot water outlet 300d; and a valve plate 830, which is located at one end of the drain hole 820 near the slag discharge box 810; wherein one end of the valve plate 830 is welded to the side wall of the substrate 211.

[0047] In the above embodiments, under normal operating conditions, the pressure inside the heat exchange plate channel is greater than the pressure inside the slag discharge box 810. Under the pressure difference, the valve plate 830 is pressed tightly against the port of the drain hole 820, closing the drain hole 820, and the heat exchange medium flows normally within the channel. When a certain amount of impurities and slag accumulates in the heat exchange plate channel, the pressure inside the channel increases, and the pressure difference between the channel and the slag discharge box 810 increases. When the pressure difference reaches a preset value, the valve plate 830 is pushed open by the pressure inside the channel, the drain hole 820 opens, and the impurities and slag in the channel flow into the slag discharge box 810 along with the heat exchange medium through the L-shaped drain hole 820. After the impurities and slag are discharged, the pressure inside the channel decreases, the pressure difference between the channel and the slag discharge box 810 decreases, and the valve plate 830 automatically resets under its own weight and the side pressure of the slag discharge box 810, closing the drain hole 820 again and restoring normal heat exchange.

[0048] This embodiment achieves online automatic slag removal from the heat exchanger plate flow channel by setting up a differential pressure driven automatic slag removal mechanism 800, solving the problem of needing to stop and disassemble the plate heat exchanger for slag removal in the prior art, and ensuring continuous operation of the equipment. The L-shaped drain hole 820 structure can effectively guide the discharge of impurities and slag at the bottom of the flow channel, avoiding the accumulation of impurities at the bottom of the flow channel and causing blockage. The purely mechanical differential pressure driven valve plate 830 structure does not require additional power unit and control system, has a simple and reliable structure, stable operation, and will not experience electrical failures. The automatic slag removal mechanism 800 can timely discharge impurities and slag in the flow channel, prevent flow channel blockage, maintain the heat exchange efficiency of the heat exchanger, extend the continuous operation time of the heat exchanger, and significantly reduce maintenance costs and labor intensity.

[0049] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0050] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A plate heat exchanger, characterized in that include: The heat exchange shell (100), and the first heat exchange plate (200a) and the second heat exchange plate (200b), wherein Multiple first heat exchange plates (200a) and multiple second heat exchange plates (200b) are provided, and multiple first heat exchange plates (200a) and multiple second heat exchange plates (200b) are vertically and alternately stacked in the heat exchange shell (100); Each of the first heat exchange plate (200a) and the second heat exchange plate (200b) has a cold water inlet (300a), a cold water outlet (300b), a hot water inlet (300c), and a hot water outlet (300d) at each of the top corners of its surface. The cold water inlets (300a) and cold water outlets (300b) of each of the first heat exchange plate (200a) and the second heat exchange plate (200b) are arranged coaxially to form a cold water channel. Each of the heat inlets (300c) and heat outlets (300d) of the first heat exchange plate (200a) and the second heat exchange plate (200b) is arranged coaxially to form a heat flow channel; A cold flow filter and a hot flow filter are respectively disposed on both sides of the heat exchange shell (100); in The inlet and outlet of the cold flow filter are respectively connected to both ends of the cold flow channel; The inlet and outlet of the heat flow filter are respectively connected to the two ends of the heat flow channel.

2. The plate heat exchanger according to claim 1, characterized in that Both the cold flow filter and the hot flow filter include: Filtering mechanism (400), the filtering mechanism (400) includes: A filter box (410) is vertically arranged on one side of the heat exchange shell (100); Multiple raised columns (420) are provided, and the multiple raised columns (420) are arranged in a frame-shaped array on the inner wall of the filter box (410); A grille (430) is disposed within the filter box (410) and mounted on each of the raised posts (420); wherein The side of the grille (430) closest to the raised column (420) is the clean water zone, and the clean water zone pipe is connected to the inlet of the cold flow channel; The side of the grille (430) away from the raised column (420) is a filtration zone, and the filtration zone pipe is connected to the outlet of the cold flow channel / hot flow channel.

3. The plate heat exchanger according to claim 2, characterized in that The cold flow filter and the hot flow filter further include a cleaning mechanism (500), the cleaning mechanism (500) comprising: The first Z-shaped rod (510) has one end passing through the filter box (410) and connected to the drive motor; The sun-shaped frame (520) has three sets of horizontally spaced first crossbeams (521) and two sets of vertically spaced first longitudinal beams (522). The bottommost first crossbeam (521) is rotatably connected to the other end of the first Z-shaped rod (510). The orifice-shaped frame (530) has two sets of horizontally spaced second crossbeams (531) and two sets of vertically spaced second longitudinal beams (532); wherein The two sets of second longitudinal beams (532) are U-shaped, and their ends are respectively connected to the ends of the two sets of second cross beams (531). The U-shaped second cross beams (531) are located on the side of the sun-shaped frame (520) away from the grid (430). The two sets of first longitudinal beams (522) are arranged through the two sets of second cross beams (531). The sun-shaped frame (520) slides vertically back and forth on one side of the mouth-shaped frame (530); Two sets of transverse guide rails (540) are provided at intervals and installed inside the filter box (410). The two sets of transverse guide rails (540) are respectively arranged through the two sets of second longitudinal beams (532). The orifice frame (530) slides laterally back and forth on the two sets of transverse slide rails; Multiple scraping brushes (550) are provided and are installed laterally on the side of each first crossbeam (521) near the grille (430).

4. The plate heat exchanger according to claim 3, characterized in that The cold flow filter and the hot flow filter further include a temperature homogenizing device (600), the temperature homogenizing device (600) comprising: A mixing box (610) is installed between two sets of second longitudinal beams (532) of the orifice frame (530); The water lifting pipe (620) has one end arranged on the bottom surface of the filter box (410) and connected to the outlet of the cold flow channel / hot flow channel, and the other end connected to the bottom of the mixing box (610).

5. The plate heat exchanger according to claim 4, characterized in that, The temperature homogenizing device (600) further includes: Multiple water intake piston assemblies (630) are provided and are spaced apart within the mixing tank (610); the water intake piston assembly (630) includes: Piston cylinder (631) is installed on the top surface inside the mixing box (610); wherein The piston cylinder (631) is equipped with a water inlet check valve at the bottom; Piston plate (632) is slidably disposed inside piston cylinder (631); The drive rod (633) is vertically arranged, with one end passing through the mixing box (610) and connecting to the piston plate (632), and the other end installed on the first crossbeam (521) at the top of the sun-shaped frame (520); The water supply pipe (634) is connected at one end to each of the piston cylinders (631) via a water outlet check valve. A strip nozzle (635) is located at the other end of the water supply pipe (634), with the outlet facing the grille (430).

6. The plate heat exchanger according to claim 5, characterized in that, The cold flow filter and the hot flow filter further include an antiscalant adding mechanism (700), which includes: A handle-shaped disc structure (710) has one end of the handle hinged to the first crossbeam (521) located in the middle of the sun-shaped frame (520), and the other end of the disc falls freely. A mixing cavity is formed on the disk end surface of the handle-shaped disk structure (710); in The mixing chamber is connected to the strip nozzle (635) and the descaling agent storage tank respectively. A sealing plate (720) is rotatably installed at the open end of the mixing chamber; A strip groove (730) is formed on the outer wall of the sealing plate (720); A strip slider (740) is slidably disposed within the strip groove (730); The second Z-shaped rod (750) is hinged at one end to the side of the strip slider (740) away from the strip groove (730); The bracket (760) is horizontally installed between the two sets of second longitudinal beams (532) of the orifice frame (530); The other end of the second Z-shaped rod (750) is hinged to the middle of the bracket (760); A spiral stirring bar (770) is arranged on the side of the sealing plate (720) near the mixing chamber.

7. The plate heat exchanger according to claim 6, characterized in that, Both the first heat exchange plate (200a) and the second heat exchange plate (200b) include: A heat exchange plate body (210), the heat exchange plate body (210) comprising: The substrate (211) has circular holes (212) at its four corners, and each of the circular holes (212) is used to form the cold water inlet (300a), the cold water outlet (300b), the hot water inlet (300c), and the hot water outlet (300d). The substrate (211) has an annular protrusion (213) integrally formed around its periphery, and a rubber sealing gasket (214) is embedded in the annular protrusion (213). The substrate (211) has a herringbone heat exchange corrugated area (215) on its surface. A flow guiding area is provided between the two sides of the herringbone heat exchange corrugated area (215) and the corresponding circular hole (212). Multiple strip-shaped flow guiding protrusions (216) are arranged at intervals in the flow guiding area. The two circular holes (212) located on a set of diagonal sides of the substrate (211) are respectively a cold water inlet (300a) and a hot water inlet (300c). The two circular holes (212) located on another set of diagonal sides of the substrate (211) are respectively a cold water outlet (300b) and a hot water outlet (300d). The adjacent first heat exchange plate (200a) and second heat exchange plate (200b) are sealed by the rubber sealing gasket (214) to form independent cold flow chamber and hot flow chamber.

8. The plate heat exchanger according to claim 7, characterized in that, The first heat exchange plate (200a) and the second heat exchange plate (200b) further include: Spiral turbulence components (220) are respectively disposed in the cold water inlet (300a) and hot water inlet (300c) of each of the substrates (211); The spiral turbulence assembly (220) includes: A plurality of arc-shaped baffles (221) are provided, and the plurality of arc-shaped baffles (221) are arranged in a ring array on the inner wall of the cold flow inlet (300a) and the hot flow inlet (300c); A reinforcing ring (222) is connected in series with each of the aforementioned arc-shaped spoilers (221).

9. The plate heat exchanger according to claim 8, characterized in that, An automatic slag discharge mechanism (800) is also provided on one side of the filter box (410), the automatic slag discharge mechanism (800) includes: A slag discharge box (810) is provided on the outer wall of the heat exchange shell (100); The drain hole (820) is L-shaped. One end of the L-shaped drain hole (820) penetrates the surface of the substrate (211), and the other end penetrates the side wall of the substrate (211) and the outer wall of the heat exchange shell (100) and communicates with the slag discharge box (810). The drain hole (820) is located at one end near the cold water outlet (300b) and the hot water outlet (300d); Valve plate (830) is located at one end of the drain hole (820) near the slag box (810); wherein One end of the valve plate (830) is welded to the side wall of the substrate (211).

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