Printed circuit board-type high-efficiency heat exchanger and core body

Abstract

The present application relates to the technical field of heat exchange devices, and in particular to a printed circuit board-type high-efficiency heat exchanger and a core body. The printed circuit board-type high-efficiency heat exchanger core body comprises a first end plate and a second end plate which are arranged in parallel; heat exchange core plate groups are periodically arranged between the first end plate and the second end plate; each heat exchange core plate group comprises a first plate body, an intermediate plate body and a second plate body which are arranged in sequence; and an intermediate plate body is disposed between two adjacent heat exchange core plate groups. The first plate body is provided with a first flow channel for a first working medium to flow in a first direction, the second plate body is provided with a second flow channel for a second working medium to flow in a second direction, and the intermediate plate body is provided with an accommodating channel for accommodating a heat-conducting medium. The printed circuit board-type high-efficiency heat exchanger core body has inherent interlayer leakage protection, can still continue to operation after leakage occurs while retaining the advantages of high heat transfer coefficient, small volume, etc., and can run continuously until the maintenance cycle of thermal power plant units elapses even after leakage occurs, before maintenance is carried out.

Description

Printed circuit board type high-efficiency heat exchanger and core

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411374753.9, filed on September 29, 2024, and entitled "Printed circuit board type high-efficiency heat exchanger and core", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of heat exchange devices, in particular to a printed circuit board type high-efficiency heat exchanger and core. BACKGROUND

[0004] In the power cycle of thermal power plants, there are a large number of heat exchange equipment, most of which belong to double-sided steam-water heat exchange. However, there is also a kind of heat exchanger that belongs to fluid heat exchange of different media on the cold and hot sides, such as natural gas, hydrogen, carbon dioxide and other working substances on one side, and steam-water medium on the other side. The fluids on the cold and hot sides of the heat exchanger are not allowed to mix or leak to each other, otherwise a large safety hazard will occur. Taking the performance heater of a combined cycle power plant as an example, the cold side is natural gas and the hot side is low-pressure hot water. If internal leakage occurs in the heat exchanger, water will be carried by natural gas, which will endanger the safe operation of the gas turbine, or natural gas will be mixed into the steam-water system, which will endanger the safe operation of the waste heat boiler and the steam turbine. Similarly, there is also a risk of leakage in the plate heat exchanger for heat exchange between hydrogen and closed water in a coal-fired generator set.

[0005] Taking a natural gas performance heater of a combined cycle as an example, in a running unit, the heat exchanger usually adopts a single-tube shell-and-tube heat exchanger, a double-tube shell-and-tube heat exchanger, and a printed circuit board heat exchanger (PCHE), and the above heat exchangers have advantages and disadvantages. The single-tube shell-and-tube heat exchanger has simple structure, thick tube wall, large volume, high thermal resistance, low cost, and mature technology, but is prone to leakage, cannot continue to operate after leakage, and must be repaired after shutdown. Generally, the repair mode of on-site inspection and plugging is adopted, and large-scale leakage damage must be repaired in the factory, which has a long repair period and high cost. The double-tube shell-and-tube heat exchanger has complex structure, double-layer heat exchange tube, high thermal resistance, large volume, high cost, and relatively mature technology, but is also prone to leakage, can continue to operate after leakage, and can be repaired when the unit reaches the maintenance period. Because of the complex structure, the heat exchanger must be returned to the factory for repair, which has a long repair period and high cost. The printed circuit board heat exchanger has a structure similar to that of a plate heat exchanger, but uses etching process to process micro-channels and uses high-temperature infiltration process to integrally infiltrate and weld the plate, has simple structure, small volume, low thermal resistance, high cost, long manufacturing period, and is not prone to leakage. However, once leakage occurs, the heat exchanger cannot continue to operate and must be repaired after shutdown. Generally, the heat exchanger is returned to the factory for repair, which has a long repair period and high cost.

[0006] Based on the characteristics of the above heat exchangers, the printed circuit board heat exchanger is widely recognized by combined cycle power plants due to its small volume, low thermal resistance, high heat exchange coefficient, and small temperature difference, and is mainly used in natural gas performance heaters. However, the existing printed circuit board heat exchanger still has leakage, which makes the heat exchanger unable to continue to operate and must be returned to the factory for repair after shutdown, causing economic losses to power generation enterprises. SUMMARY

[0007] The purpose of the present application is to provide a printed circuit board high-efficiency heat exchanger core to solve the problem that the existing printed circuit board heat exchanger cannot continue to maintain high efficiency after leakage.

[0008] To solve the above problems, the present application provides a printed circuit board high-efficiency heat exchanger core, which adopts the following technical scheme:

[0009] A printed circuit board high-efficiency heat exchanger core, comprising first and second end plates arranged in parallel, and heat exchange core plate groups periodically arranged between the first and second end plates, wherein the heat exchange core plate groups comprise first, intermediate, and second plate bodies arranged in sequence, an intermediate plate body is arranged between two adjacent heat exchange core plate groups, the first plate body is provided with a first flow channel for a first working medium to flow in a first direction, the second plate body is provided with a second flow channel for a second working medium to flow in a second direction, and the intermediate plate body is provided with an accommodation channel for accommodating a heat-conducting medium.

[0010] Further, the containing passage is composed of a plurality of containing microchannels on the surface of the intermediate plate body, the inlets and outlets of the containing microchannels are arranged at the same side position on the intermediate plate body and penetrate through the side position, and the containing microchannels are used for containing the heat-conducting medium.

[0011] Further, the containing microchannels are first U-shaped microchannels, and the first U-shaped microchannels are arranged at equal intervals along the central position to the edge position of the surface of the intermediate plate body.

[0012] Further, the first flow channel has a first pressure, the second flow channel has a second pressure, and the containing passage has a third pressure, and the third pressure is different from the first pressure and the second pressure.

[0013] Further, the first flow channel is composed of a plurality of first microchannels arranged at equal intervals on the surface of the first plate body, the inlets and outlets of the first microchannels are arranged at two side positions on the first plate body which are perpendicular to the side on which the inlets and outlets of the containing microchannels are arranged and penetrate through the two side positions, and the first microchannels are used for conveying the first working medium.

[0014] Further, the second flow channel is composed of a plurality of second microchannels on the surface of the second plate body, the inlets and outlets of the second microchannels are arranged at the same side position on the second plate body which is opposite to the position of the inlets and outlets of the containing microchannels and penetrate through the side position, and the second microchannels are used for conveying the second working medium.

[0015] Further, the second microchannels are second U-shaped microchannels, and the second U-shaped microchannels are arranged at equal intervals along the central position to the edge position of the surface of the second plate body.

[0016] Further, the number of intermediate plate bodies between the adjacent first plate body and second plate body is single, and the first plate body, the second plate body and the intermediate plate body are arranged at equal thickness.

[0017] Further, the first microchannels are any one of a straight line shape, a sine wave shape, a triangular wave shape, a square wave shape, a sawtooth wave shape, a wing fin shape and an S fin shape, and the cross-sectional shape of the microchannels of the first flow channel is any one of a semicircular shape, a circular shape, a semi-elliptical shape, an elliptical shape, a U shape, a rectangular shape and a trapezoidal shape.

[0018] Beneficial effects: the application is an improved application, the application periodically arranges a heat exchange core plate group between the first end plate and the second end plate in the printed circuit board type high-efficiency heat exchanger core, the heat exchange core plate group includes sequentially arranged first plate bodies, intermediate plate bodies and second plate bodies, an intermediate plate body is arranged between adjacent two heat exchange core plate groups, so that an intermediate plate body is arranged between adjacent first plate bodies and second plate bodies, at this time, any two first plate bodies and second plate bodies are not in direct contact. In the working state of the heat exchanger, the containing channel on the intermediate plate body contains a heat conducting medium, the heat conducting medium is in a non-flowing state and is only used for heat conduction. If the first plate body containing the first working medium or the second plate body containing the second working medium leaks, since an intermediate plate body is arranged between adjacent first plate bodies and second plate bodies, the leaked first working medium or second working medium will not mix into the other kind of working medium, but the leaked first working medium or second working medium mixes with the heat conducting medium on the intermediate plate body, at the same time, the side without leakage is in good condition, and the heat exchanger can continue to work until the next maintenance period of the unit. The above-mentioned printed circuit board type high-efficiency heat exchanger core has a sandwich leakage protection, can continue to be put into operation after leakage, and has the advantages of high heat exchange coefficient, small volume and the like, and can continue to operate even after leakage until the maintenance period of the thermal power plant unit.

[0019] The containing channel is composed of a plurality of containing microchannels on the surface of the intermediate plate body, the inlet and outlet of the containing microchannel are arranged at the same side position on the intermediate plate body and penetrate through the side position, so as to facilitate the entry and exit of the heat conducting medium and contain the heat conducting medium, and realize the heat conduction and mixing leakage work, and the structure is simple.

[0020] The containing microchannel is a first U-shaped microchannel, the first U-shaped microchannel is diffused and arranged along the center position of the surface of the intermediate plate body to the edge position at equal intervals, so as to facilitate the heat conduction of the heat conducting medium with the maximum area, and avoid excessive pressure in the channel due to the complex and variable containing microchannel.

[0021] The first flow channel has a first pressure, the second flow channel has a second pressure, the containing channel has a third pressure, the third pressure is different from the first pressure and the second pressure, so as to timely find the existence of leakage. When the first plate body or the second plate body leaks, the leaked first working medium or second working medium mixes with the heat conducting medium, then the side pressure of the containing channel and the corresponding cavity cannot be maintained and changes to the same as the pressure of the leakage side, so it is known which side of the first plate body or the second plate body in the heat exchanger leaks.

[0022] The first flow channel is composed of a plurality of first micro-channels on the surface of the first plate body, the inlet and outlet of the first micro-channels are arranged at the positions on the first plate body which are perpendicular to the two sides of the side on which the inlet and outlet of the micro-channels are located, and penetrate through the two positions, so as to facilitate the flow of one of the cold and hot fluids, and the two ends of the heat exchanger can be directly flowed through according to the heat exchange requirement, and the head structure can be installed at the two ends after the heat exchange plate stack is penetration welded.

[0023] The second flow channel is composed of a plurality of second micro-channels on the surface of the second plate body, the inlet and outlet of the second micro-channels are arranged at the positions on the second plate body which are opposite to the positions of the inlet and outlet of the micro-channels, and penetrate through the side position, the second micro-channels are used to transport the second working medium, so as to facilitate the flow of the other one of the cold and hot fluids, and effectively realize heat conduction.

[0024] The number of the intermediate plate body between the adjacent first plate body and the second plate body is single, and the first plate body, the second plate body and the intermediate plate body are arranged in equal thickness, so as to prevent the problem of hindering heat transfer caused by too many intermediate plate bodies between the adjacent first plate body and the second plate body, and the equal thickness of the first plate body, the second plate body and the intermediate plate body makes the heat transfer effect better.

[0025] The application also provides a printed circuit board type high-efficiency heat exchanger, which comprises the printed circuit board type high-efficiency heat exchanger core.

[0026] Advantages: the printed circuit board type high-efficiency heat exchanger has the advantages of the printed circuit board type heat exchanger and the safety advantages of the double-tube shell type heat exchanger, is a printed circuit board type high-efficiency heat exchanger with a sandwich leakage protection structure, can continue to operate after leakage, has the advantages of high heat exchange coefficient and small size, and can continue to operate after leakage until the maintenance period of the thermal power plant unit, and solves the risk caused by leakage from the physical structure, reduces the economic loss caused by leakage for the thermal power enterprise. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 is a structural schematic view of the heat exchanger core in the embodiment 1 of the printed circuit board type high-efficiency heat exchanger core of the application;

[0028] Fig. 2 is a structural schematic view of the plate body stack in the heat exchanger core in the embodiment 1 of the printed circuit board type high-efficiency heat exchanger core of the application;

[0029] Fig. 3 is a structural schematic view of the intermediate plate body in the embodiment 1 of the printed circuit board type high-efficiency heat exchanger core of the application;

[0030] Figure 4 is a structural schematic diagram of the first plate body in Embodiment 4 of the printed circuit board type high-efficiency heat exchanger core of the present application;

[0031] Figure 5 is a structural schematic diagram of the second plate body in Embodiment 5 of the printed circuit board type high-efficiency heat exchanger core of the present application;

[0032] Figure 6 is a schematic diagram of the appearance of the heat exchanger in Embodiment 1 of the printed circuit board type high-efficiency heat exchanger of the present application;

[0033] Figure 7 is a perspective view of the heat exchanger in Embodiment 1 of the printed circuit board type high-efficiency heat exchanger of the present application;

[0034] Figure 8 is a sectional view of the heat exchanger in Embodiment 1 of the printed circuit board type high-efficiency heat exchanger of the present application;

[0035] In the figure, 1 is a first end plate; 2 is a second end plate; 3 is a first plate body; 31 is a first microchannel; 4 is an intermediate plate body; 41 is a microchannel containing portion; 5 is a second plate body; 51 is a second microchannel; 6 is a first end cap; 7 is a second end cap; 8 is an upper end cap; 9 is a lower end cap; and 10 is a partition plate. DETAILED DESCRIPTION

[0036] As cited in the background, the existing printed circuit board heat exchanger cannot continue to maintain high efficiency heat exchange after leakage. Therefore, the present application provides a printed circuit board high-efficiency heat exchanger core, comprising a first end plate and a second end plate arranged in parallel, the first end plate and the second end plate are used to seal the first plate body and the second plate body, preventing the first plate body and the second plate body from leaking vertically to the first plate body and the second plate body direction of the first working medium and the second working medium; The first end plate and the second end plate are periodically arranged with a heat exchange core plate group, the heat exchange core plate group comprises a first plate body, an intermediate plate body and a second plate body arranged in sequence, an intermediate plate body is arranged between two adjacent heat exchange core plate groups, so that an intermediate plate body is arranged between any two adjacent first plate bodies and second plate bodies, completely realizing the isolation between the first plate body and the second plate body, preventing the first working medium and the second working medium from mixing. Among them, the first plate body is provided with a first flow channel for the first working medium to flow in the first direction, for circulating the first working medium, the second plate body is provided with a second flow channel for the second working medium to flow in the second direction, for circulating the second working medium, realizing the cold and hot exchange of the heat exchanger; The intermediate plate body is provided with a containing channel for containing a heat conducting medium, in the working state of the heat exchanger, the containing channel is filled with a heat conducting medium, which is in a non-flowing state and is only used for heat conduction. If the first plate body filled with the first working medium or the second plate body filled with the second working medium leaks, the leaked first working medium or second working medium will mix with the heat conducting medium, at the same time, the side without leakage is in good condition, and the heat exchanger can continue to work until the next maintenance period of the unit. The above-mentioned printed circuit board high-efficiency heat exchanger core has both sandwich leakage protection, which can still be put into operation after leakage, and has the advantages of high heat exchange coefficient, small volume and the like, and can still be continuously operated after leakage until the maintenance period of the thermal power plant unit.

[0037] Specific embodiment 1 of the printed circuit board high-efficiency heat exchanger core of the present application:

[0038] In the embodiment, as shown in FIG. 1 and FIG. 2, the printed circuit board type high-efficiency heat exchanger core includes a first end plate 1 and a second end plate 2, the first end plate 1 and the second end plate 2 are arranged in parallel along the up-down direction, and the first end plate 1 and the second end plate 2 are plates of the same size and the same material. The first end plate 1 and the second end plate 2 are periodically arranged with heat exchange core plate groups, the heat exchange core plate includes a first plate body 3, an intermediate plate body 4 and a second plate body 5 arranged in sequence, the intermediate plate body 4 is arranged between any two adjacent heat exchange core plate groups, so that the intermediate plate body 4 is arranged between any two adjacent first plate body 3 and second plate body 5. The surface of the first plate body 3 is provided with a first flow channel for the first working medium to flow in the first direction, the surface of the second plate body 5 is provided with a second flow channel for the second working medium to flow in the second direction, and the intermediate plate body 4 is provided with an accommodation channel 41 for accommodating a heat-conducting medium. The first plate body 3, the intermediate plate body 4 and the second plate body 5 form the core plate of three kinds of etching fluid channels of the printed circuit board type high-efficiency heat exchanger core, and the three kinds of heat exchange core plates form cold and hot fluid channels and a leakage detection channel which can inject heat-conducting oil, wherein the first working medium is cold fluid; and the second working medium is hot fluid.

[0039] The number of the intermediate plate body 4 in the heat exchange core plate group and the intermediate plate body 4 between the two adjacent heat exchange core plate groups can be multiple, that is, multiple intermediate plate bodies 4 are arranged between the two adjacent first plate body 3 and second plate body 5, and the heat-conducting medium in the accommodation channel 41 of the multiple intermediate plate bodies 4 is in a non-flowing state during normal use of the heat exchanger core, and is only used for heat conduction; if the first plate body 3 containing the cold fluid or the second plate body 5 containing the hot fluid leaks, the leaked cold fluid or hot fluid will mix with the heat-conducting medium. However, due to the large number of intermediate plate bodies 4, there is a problem of hindering heat conduction, and the structure is complex, therefore, in the embodiment, the number of intermediate plate bodies 4 is one, which can efficiently conduct heat and mix with the leaked fluid, and the structure is simple.

[0040] The thickness of the first plate body 3, the second plate body 5 and the intermediate plate body 4 can be non-uniform, but when the thickness of the three is not the same, uneven heat dissipation may occur, therefore, in the embodiment, the number of intermediate plate bodies 4 between the adjacent first plate body 3 and second plate body 5 is single, and the thickness of the first plate body 3, the second plate body 5 and the intermediate plate body 4 is the same.

[0041] In the embodiment, as shown in FIG. 3, the accommodation channel on the intermediate plate body 4 is composed of a plurality of accommodation micro-channels 41 on the surface of the intermediate plate body 4, the inlet and outlet of the accommodation micro-channels 41 are arranged at the same side position on the intermediate plate body 4, that is, the inlet and outlet of the accommodation micro-channels 41 are arranged at the left side position on the intermediate plate body 4 and penetrate the side position, for accommodating the heat-conducting medium.

[0042] In other embodiments, the inlets and outlets of the microchannels 41 can be arranged at a right side position on the intermediate plate body 4 and extend through the side position. In other embodiments, the inlets and outlets of the microchannels 41 can be arranged at an upper side position on the intermediate plate body 4 and extend through the side position. In other embodiments, the inlets and outlets of the microchannels 41 can be arranged at a lower side position on the intermediate plate body 4 and extend through the side position.

[0043] Specific embodiment 2 of the printed circuit board type high-efficiency heat exchanger core of the present application:

[0044] On the basis of the technical concept of the present application described above, or on the basis of the specific embodiments of the present application described above, another embodiment is provided below.

[0045] The microchannels 41 can be V-shaped microchannels or irregular curved shapes. The microchannels 41 can be arranged side by side on the surface of the intermediate plate body 4, but when the microchannels 41 are V-shaped microchannels and arranged side by side on the surface of the intermediate plate body 4, the V-shaped microchannels are less and the heat conduction efficiency is low due to the inlet and outlet positions being at the same side position. When the microchannels are irregular curved shapes and arranged side by side on the surface of the intermediate plate body 4, the pressure in the channels is too high due to the complexity of the microchannels, which is not convenient for the intermingled leaked fluid. Optionally, as shown in FIG. 3, the microchannels 41 are first U-shaped microchannels, the inlet and outlet positions of the first U-shaped microchannels are at the left side of the intermediate plate body 4, and the first U-shaped microchannels are arranged at equal intervals along the center position of the surface of the intermediate plate body 4 to the edge position, so that the heat conduction area is maximized, and the heat conduction of the heat conduction medium is more effectively realized, and at the same time, it is convenient for the intermingled leaked fluid.

[0046] Specific embodiment 3 of the printed circuit board type high-efficiency heat exchanger core of the present application:

[0047] On the basis of the technical concept of the present application described above, or on the basis of the specific embodiments of the present application described above, another embodiment is provided below.

[0048] In the embodiment, the first flow channel has cold fluid with a first pressure, the second flow channel has hot fluid with a second pressure, the containing channel has the heat-conducting medium heat-conducting oil injected therein and maintains a third pressure, and the third pressure is different from the first pressure and the second pressure and has a significant difference. In use, when the first plate body 3 or the second plate body 5 leaks, the leaked cold fluid or hot fluid is mixed with the heat-conducting medium, the pressure of the containing channel and the corresponding cavity cannot be maintained, and changes to the same as the pressure of the leaking side. In this way, it is known that the first plate body 3 or the second plate body 5 of the heat exchanger leaks on which side. Therefore, the printed circuit board type high-efficiency heat exchanger core of the application can detect whether the heat exchanger leaks on line, and can also know which side of the cold fluid or the hot fluid leaks.

[0049] Specific embodiment 4 of the printed circuit board type high-efficiency heat exchanger core of the application:

[0050] On the basis of the technical concept of the application described above, or on the basis of the specific embodiments of the application described above, another embodiment is provided below.

[0051] In the embodiment, as shown in FIG. 4, the first flow channel is composed of a plurality of first microchannels 31 on the surface of the first plate body 3, the inlet and outlet of the first microchannel 31 are respectively arranged at the positions on the two sides of the first plate body 3 perpendicular to the side on which the inlet and outlet of the containing microchannel are located, that is, the inlet of the first microchannel 31 is arranged at the upper side position on the first plate body 3, and the outlet is arranged at the lower side position on the first plate body 3, and penetrates the two side positions, and the first microchannel 31 is used for conveying cold fluid. The first microchannel 31 has a straight line shape along the up-down direction of the first plate body 3, and the cross-sectional shape of the first microchannel 31 is semicircular, which is simple in structure. The first microchannel 31 supports direct flow through both ends of the heat exchanger, and after the heat exchanger plate is stacked and penetration welded, it is convenient to install a head structure at the two ends.

[0052] In other embodiments, the first microchannel 31 can have any one of a sine wave shape, a triangular wave shape, a square wave shape, a sawtooth wave shape, a wing fin shape, and an S fin shape. The cross-sectional shape of the first microchannel 31 can be any one of a circular shape, a semi-elliptical shape, an elliptical shape, a U shape, a rectangular shape, and a trapezoidal shape.

[0053] In other embodiments, when the inlet and outlet of the containing microchannel 41 are arranged at the upper side or lower side of the middle plate body 4, the inlet of the first microchannel 31 is arranged at the left side of the first plate body 3, the outlet is arranged at the right side of the first plate body 3, and penetrates through the two sides.

[0054] Specific embodiment 5 of the printed circuit board type high-efficiency heat exchanger core of the present application:

[0055] In the present embodiment, as shown in Fig. 5, the second flow channel is composed of a plurality of second microchannels 51 on the surface of the second plate body 5, the inlet and outlet of the second microchannel 51 are arranged at the side opposite to the position of the inlet and outlet of the containing microchannel on the second plate body 5, i.e. the inlet and outlet of the second microchannel 51 are arranged at the right side of the second plate body 5 and penetrate through the side, and the second microchannel 51 is used for transporting the second working medium. The second microchannel 51 is a second U-shaped microchannel, the second U-shaped microchannel is arranged at equal intervals along the center position to the edge position of the surface of the second plate body 5, at this time, the first flow channel is arranged perpendicularly to the flow channel direction of the second flow channel and the containing channel. The second U-shaped microchannel needs to be provided with a corresponding structure of a head at one end of the heat exchanger, and a partition is arranged in the head so as to separate the inlet and outlet channels of the fluid.

[0056] In other embodiments, the first flow channel and the second flow channel and the flow channel direction of the containing channel can be arranged obliquely.

[0057] In other embodiments, when the inlet and outlet of the containing microchannel 41 can be arranged at the right side of the middle plate body 4, the inlet and outlet of the second microchannel 51 are arranged at the left side of the second plate body 5. In other embodiments, when the inlet and outlet of the containing microchannel 41 are arranged at the upper side of the middle plate body 4, the inlet and outlet of the second microchannel 51 are arranged at the lower side of the second plate body 5. In other embodiments, when the inlet and outlet of the containing microchannel 41 are arranged at the lower side of the middle plate body 4, the inlet and outlet of the second microchannel 51 are arranged at the upper side of the second plate body 5.

[0058] Specific embodiment 1 of the printed circuit board type high-efficiency heat exchanger of the present application:

[0059] In this embodiment, as shown in Figures 6, 7 and 8, the stacked heat exchanger core is welded by high-temperature infiltration welding process to form a heat exchanger core. The heat exchanger core is the main heat exchange element. The second end cover 7 is installed on the upper and lower sides of the heat exchanger core. The first end cover 6 is installed on the left side of the heat exchanger core. The right side is provided with a corresponding structure of the end cover. The partition plate 10 is arranged in the end cover to separate the end cover into the upper end cover 8 and the lower end cover 9 to separate the inlet and outlet channels of the fluid. Thus, the printed circuit board type high-efficiency heat exchanger with sandwich leakage protection structure is formed. In the printed circuit board type high-efficiency heat exchanger, the printed circuit board type high-efficiency heat exchanger core is an integral whole and cannot be disassembled. The individual channel that leaks can only be repaired in the form of plugging. Therefore, a certain amount of heat exchange area should be reserved during the design and calculation of the heat exchanger, that is, the heat exchange area margin can be increased by increasing the number of plates during the design and processing. Generally, the number of plates can be increased by 10% to 20%.

[0060] During use of the heat exchanger, the cold fluid passes through the upper and lower second end covers 7 to realize flow and heat conduction in the first microchannel 31. The first end cover 6 injects the heat conducting oil from the left into the containing microchannel 41 of the middle plate body 4. The hot fluid enters the upper end cover 8 on the right side. The hot fluid after heat conduction flows out from the lower end cover 9. During use, the heat conducting oil in the containing microchannel 41 is in a non-flowing state and is only used for heat conduction. If the cold fluid or the hot fluid leaks, the leaked fluid enters the containing microchannel 41 and mixes with the heat conducting oil. At the same time, the side without leakage is in good condition, and the heat exchanger can continue to work until the next maintenance period of the unit.

[0061] In other embodiments, the hot fluid passes through the upper and lower second end covers 7 to realize flow in the first microchannel 31. The first end cover 6 injects the heat conducting oil from the left into the containing microchannel 41 of the middle plate body 4. The cold fluid enters the lower end cover 9 on the right side. The cold fluid after heat conduction flows out from the upper end cover 8. During use, the heat conducting oil in the containing microchannel 41 is in a non-flowing state and is only used for heat conduction. If the cold fluid or the hot fluid leaks, the leaked fluid enters the containing microchannel 41 and mixes with the heat conducting oil. At the same time, the side without leakage is in good condition, and the heat exchanger can continue to work until the next maintenance period of the unit.

[0062] Through the above description of the specific embodiments of the printed circuit board type high-efficiency heat exchanger core of the present application, it can be seen that the printed circuit board type high-efficiency heat exchanger core of the present application comprises a first end plate and a second end plate arranged in parallel, the first end plate and the second end plate are used to seal the first plate body and the second plate body, to prevent the first plate body and the second plate body from leaking the first working medium and the second working medium vertically to the direction of the first plate body and the second plate body; the first end plate and the second end plate are periodically arranged with heat exchange core plate groups in sequence, the heat exchange core plate group comprises the first plate body, the intermediate plate body and the second plate body arranged in sequence, the intermediate plate body is arranged between the adjacent two heat exchange core plate groups, so that the intermediate plate body is arranged between any two first plate bodies and second plate bodies, the first plate body is provided with a first flow channel for the first working medium to flow in the first direction, for circulating the first working medium; the second plate body is provided with a second flow channel for the second working medium to flow in the second direction, for circulating the second working medium, to realize the cold and hot exchange of the heat exchanger; the intermediate plate body is provided with an accommodation channel for accommodating the heat-conducting medium, in the working state of the heat exchanger, the heat-conducting medium is filled in the accommodation channel, the heat-conducting medium is in a non-flowing state and is only used for heat conduction. If the first plate body filled with the first working medium or the second plate body filled with the second working medium leaks, the leaked first working medium or second working medium will mix with the heat-conducting medium, at the same time, the side without leakage is in good condition, and the heat exchanger can continue to work until the next maintenance period of the unit. The above-mentioned printed circuit board type high-efficiency heat exchanger core has both sandwich leakage protection, it can still continue to operate after leakage, and has the advantages of high heat transfer coefficient, small volume and the like, and even after leakage it can still continue to operate to the maintenance period of the thermal power plant unit and then be repaired.

[0063] The above is only a preferred embodiment of the present application and does not limit the present application, the patent protection scope of the present application is subject to the claims, any equivalent structural changes made by applying the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A printed circuit board type high efficiency heat exchanger core, characterized by, The heat exchanger core comprises first and second end plates arranged in parallel, and a plurality of heat exchange core plates arranged periodically between the first and second end plates, wherein the heat exchange core plates comprise first, intermediate and second plate bodies arranged in sequence, the intermediate plate body is arranged between two adjacent heat exchange core plates, the first plate body is provided with a first flow channel for a first working medium to flow in a first direction, the second plate body is provided with a second flow channel for a second working medium to flow in a second direction, and the intermediate plate body is provided with a containing channel for containing a heat conducting medium.

2. The printed circuit board high efficiency heat exchanger core of claim 1, wherein, The containing channel is composed of a plurality of containing micro-channels on the surface of the intermediate plate body, the inlet and outlet of the containing micro-channels are arranged at the same side position on the intermediate plate body and penetrate through the side position, and the containing micro-channels are used for containing the heat conducting medium.

3. The printed circuit board high efficiency heat exchanger core of claim 2, wherein, The containing micro-channels are first U-shaped micro-channels, and the first U-shaped micro-channels are arranged at equal intervals from the central position to the edge position of the surface of the intermediate plate body.

4. The printed circuit board high efficiency heat exchanger core of any of claims 1-3, wherein, The first flow channel has a first pressure, the second flow channel has a second pressure, and the containing channel has a third pressure, wherein the third pressure is different from the first pressure and the second pressure.

5. The printed circuit board high efficiency heat exchanger core of claim 2, wherein, The first flow channel is composed of a plurality of first micro-channels arranged at equal intervals on the surface of the first plate body, the inlet and outlet of the first micro-channels are arranged at two side positions on the first plate body perpendicular to the side of the inlet and outlet of the containing micro-channels and penetrate through the two side positions, and the first micro-channels are used for conveying the first working medium.

6. The printed circuit board high efficiency heat exchanger core of claim 2, wherein, The second flow channel is composed of a plurality of second micro-channels on the surface of the second plate body, the inlet and outlet of the second micro-channels are arranged at the same side position on the second plate body opposite to the position of the inlet and outlet of the containing micro-channels and penetrate through the side position, and the second micro-channels are used for conveying the second working medium.

7. The printed circuit board high efficiency heat exchanger core of claim 6, wherein, The second micro-channels are second U-shaped micro-channels, and the second U-shaped micro-channels are arranged at equal intervals from the central position to the edge position of the surface of the second plate body.

8. The printed circuit board high efficiency heat exchanger core of claim 1, wherein, The number of intermediate plate bodies between the adjacent first and second plate bodies is one, and the first, second and intermediate plate bodies have equal thickness.

9. The printed circuit board high efficiency heat exchanger core of claim 5, wherein, The first micro-channels have any one of straight line shape, sinusoidal wave shape, triangular wave shape, square wave shape, sawtooth wave shape, wing fin shape and S fin shape, and the cross-sectional shape of the first micro-channels has any one of semicircular shape, circular shape, semi-elliptical shape, elliptical shape, U shape, rectangular shape and trapezoidal shape.

10. A printed circuit board type high efficiency heat exchanger, characterized by, The printed circuit board type high-efficiency heat exchanger core comprises the printed circuit board type high-efficiency heat exchanger core according to any one of claims 1-9.

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