Novel hot wall type heat exchanger

Abstract

An upper heat exchange device and a lower heat exchange device are fixedly connected, a heat exchanger core is nested between the upper heat exchange device and the lower heat exchange device, pressure-bearing hot wall parts are oppositely arranged on two sides of a middle hot wall part, and phase change fluid fins are hermetically brazed on the inner sides of the pressure-bearing hot wall parts or the middle hot wall part. A fluid channel layer is formed between the side walls of the pressure-bearing hot wall piece or the middle hot wall piece, a separation brazing block is arranged in the middle of the fluid channel layer to divide the fluid channel layer into an area A and an area B, a plurality of sets of heat exchange fluid fins are arranged in the area A and the area B respectively, and an upper fluid inlet is communicated with the area A and forms a fluid circulation channel A together with a lower fluid outlet. The lower fluid inlet is communicated with the area B and forms a fluid circulation channel B together with the upper fluid outlet. The heat exchanger can be widely used for liquid-liquid heat exchange, gas-gas heat exchange or gas-liquid heat exchange, and is compact in structure, high in pressure-resistant use temperature, small in size, high in heat exchange efficiency, space-saving, cost-saving, convenient to disassemble and convenient to clean.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid machinery, in particular to a novel hot wall type heat exchanger. Background Art

[0002] The advantage of plate heat exchangers is their high heat transfer coefficient, which is because the flow channel of plate heat exchangers is small, the plates are corrugated, and the cross-section changes are complex, which makes the flow direction and flow velocity of the fluid constantly change, increasing the disturbance of the fluid, so that turbulence can be achieved at a very small flow rate, and has a higher heat transfer coefficient. It is particularly suitable for heat exchange between liquids and heat exchange between fluids with relatively low temperatures; it can also achieve the required heat transfer area by increasing or decreasing the plates. A heat exchanger can be divided into several units, which can be used for heating or cooling several fluids at the same time. It has a compact structure, small size, and few consumables. The heat transfer area per cubic meter of volume can reach 250m 2 . However, the plate heat exchanger has poor sealing and is prone to leakage. The gasket needs to be replaced frequently, which is troublesome. The operating pressure is subject to certain restrictions, generally not exceeding 1MPa, and the operating temperature is limited by the temperature resistance of the gasket material. If an integral brazed plate heat exchanger is used, although the pressure bearing capacity is greatly improved, the blockage of the channel between the plates cannot be cleaned and dredged, which cannot be compared with the shell and tube heat exchanger. In addition, its flow channel is small, which is not suitable for heat exchange between gas and gas or condensation of steam, which is easy to cause blockage. It is not suitable for fluids containing suspended matter, and the flow resistance is larger than that of the shell and tube type. As a type of heat exchanger, the plate exchanger relies on the separation between the two fluids and the plates to achieve heat exchange. Its efficiency is closely related to the flow rate and temperature difference of the water in the flow channel between the plates. Once the flow changes, the heat transfer coefficient also changes, and the change is large. Therefore, the plate exchanger can only be used in systems with stable loads, such as heating systems with a certain flow rate, which is a typical application. The flow rate of domestic hot water changes quite dramatically during the day, so it is extremely unsuitable to use plate exchangers. A volumetric heat exchanger is required to store a certain amount of hot water, which can cope with the flow changes on the user side to a considerable extent.

[0003] At present, heat pipes are also widely used because they can achieve long-distance heat transfer, and the temperature difference of the fluid heat exchange at both ends is highly sensitive, and a temperature difference of 0.1℃ will react. The heat pipe heat exchanger is an efficient heat recovery heat exchanger. Compared with other heat recovery heat exchangers, it has the following advantages: 1. High efficiency and energy saving. The heat pipe heat exchanger uses unique heat pipe technology to achieve efficient heat recovery and save energy costs. 2. Small heat loss. The heat pipe heat exchanger has a small heat loss and can maximize the heat recovery efficiency. 3. Simple structure. The heat pipe heat exchanger has a simple structure and is easy to maintain and clean. 4. Wide range of applications. The heat pipe heat exchanger is suitable for various industrial fields, including chemical industry, electric power, manufacturing industry, etc. But there are also many disadvantages: 1. High cost. The heat pipe heat exchanger is more expensive than other heat exchangers and is not suitable for small enterprises. 2. High installation requirements. The installation of the heat pipe heat exchanger requires relatively high technical requirements and requires professional personnel to install and debug. 3. Short service life. The service life of the heat pipe heat exchanger is relatively short and needs to be replaced or maintained frequently. In short, the heat pipe heat exchanger is a highly efficient heat recovery heat exchanger. Although it has some disadvantages, it has been widely used in various industrial fields. The heat pipe heat exchanger is not limited by the air flow velocity in structure, the heat exchange efficiency is stable, and it is not easy to get dirty and blocked. The wind speed can be from 1 m / s to 5 m / s. In practice, 2.5-3.5 m / s is more commonly used. The resistance is also small, and basically no noise is generated during operation. The resistance is in the range of 90-180 Pa. In terms of space, the area of ​​the machine room is not required, and it can be perfectly combined with the air conditioning box. The air intake and exhaust air flow are tightly separated, and there will be no cross contamination. This is a major advantage of the heat pipe.

[0004] At present, plate heat exchangers are used in fresh air units. The heat exchange direction of the plate heat exchanger is cross-flow heat exchange. In this direction of heat exchange, the gaps between the layers make it difficult to prevent cross-flow between fresh air and exhaust air, and the cross-contamination problem between fresh air and exhaust air cannot be solved, and the quality of fresh air cannot be guaranteed. In addition, due to its structure, the plate heat exchanger is easy to clog and difficult to clean. The plate heat exchanger is installed in the air conditioning unit. If the heat exchanger fails, it needs to be dismantled first, which is relatively complicated and its service life will be reduced. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a novel hot wall heat exchanger.

[0006] The utility model provides the following technical solutions: a novel hot wall heat exchanger, characterized in that it comprises an upper heat exchange device, a lower heat exchange device and a heat exchanger core, wherein the upper heat exchange device and the lower heat exchange device are fixedly connected and a heat exchanger core is nested in the middle, wherein the heat exchanger core comprises two groups of integrally brazed pressure-bearing hot wall parts and a plurality of groups of integrally brazed intermediate hot wall parts, pressure-bearing hot wall parts are arranged on both sides of the intermediate hot wall parts, a phase change fluid fin is sealed and brazed on the inner side of the pressure-bearing hot wall part or the intermediate hot wall part, and a fluid is formed between the side walls of the pressure-bearing hot wall part or the intermediate hot wall part. A channel layer, sealing brazing blocks are respectively provided at both ends of the fluid channel layer, a partition brazing block is provided in the middle of the fluid channel layer to divide it into area A and area B, and multiple groups of heat exchange fluid fins are respectively provided in area A and area B; an upper fluid inlet and an upper fluid outlet are provided on the outer side of the upper heat exchange device, and a lower fluid inlet and a lower fluid outlet are provided on the outer side of the lower heat exchange device, the upper fluid inlet is connected with the area A and forms a fluid circulation channel A together with the lower fluid outlet; the lower fluid inlet is connected with the area B and forms a fluid circulation channel B together with the upper fluid outlet.

[0007] Preferably, the pressure-bearing hot wall component and the intermediate hot wall component both include a wall surface and a sealing frame, and the upper and lower ends of the sealing frame are respectively sealed with the wall surface by brazing to form a sealed space, and multiple groups of phase change fluid fins are vertically arranged in the sealed space, and the phase change fluid fins are rectangular.

[0008] Preferably, a plurality of sealing grooves are relatively provided on the inner sides of the upper heat exchange device and the lower heat exchange device, and sealing gaskets are nested in the sealing grooves.

[0009] Preferably, the sealing gasket pressed against the partition brazing block covers at least 80% of the surface area of ​​the partition brazing block.

[0010] Preferably, the separation brazing block is a solid block or a hollow block.

[0011] Preferably, a phase change fluid injection hole and an air exhaust hole are provided on the sealing frame, and the phase change fluid injection hole and the air exhaust hole are arranged on the same side or different sides of the sealing frame.

[0012] Preferably, the wall surface of the pressure-bearing hot wall component is a pressure-resistant metal plate.

[0013] Preferably, the upper fluid inlet, the upper fluid outlet, the lower fluid inlet and the lower fluid outlet are provided with connecting flanges, and the connecting flanges are circular and / or square.

[0014] Preferably, locking screw holes are provided at the four corners of the upper heat exchange device and the lower heat exchange device, and fastening screws are passed through the locking screw holes, and both ends of the fastening screws are fixedly connected to the locking screw holes through nuts.

[0015] Compared with the existing technology, the beneficial effects of the utility model are:

[0016] (1) The utility model is characterized in that an upper heat exchange device and a lower heat exchange device are fixedly connected and a heat exchanger core is nested in the middle. The heat exchanger core includes two groups of integrally brazed pressure-bearing hot wall parts and a plurality of groups of integrally brazed intermediate hot wall parts. Pressure-bearing hot wall parts are arranged on both sides of the intermediate hot wall parts. Phase change fluid fins are sealed and brazed on the inner side of the pressure-bearing hot wall parts or the intermediate hot wall parts. A fluid channel layer is formed between the side walls of the pressure-bearing hot wall parts or the intermediate hot wall parts. Sealing brazing blocks are respectively arranged at both ends of the fluid channel layer. A separating brazing block is arranged in the middle of the fluid channel layer to divide it into zone A and zone B. Multiple groups of heat exchange fluid fins are respectively arranged in zone A and zone B. An upper fluid inlet and an upper fluid outlet are arranged on the outer side of the upper heat exchange device. A lower fluid inlet and a lower fluid outlet are arranged on the outer side of the lower heat exchange device. The upper fluid inlet is connected to zone A and forms a fluid circulation channel A together with the lower fluid outlet. The lower fluid inlet is connected to zone B and forms a fluid circulation channel B together with the upper fluid outlet. The structure of the utility model is more compact than that of a heat pipe and can also realize long-distance heat transmission. The two heat exchange fluids can flow separately and independently without cross contamination. The thermal reaction is more sensitive than that of a heat pipe, and the circulation mileage of the internal phase change fluid will be shorter than that of a heat pipe, the circulation speed will be faster, and the effect will be stronger. The utility model is easier to clean than the existing plate heat exchanger, and one side can be cleaned while running, or both sides can be cleaned. The plates do not need to be separated from each other, and the cleaning speed is fast. It has the advantages of high heat flux density of heat pipes and compactness of plate heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is one of the schematic diagrams of the internal structure of the pressure-bearing hot wall component or the intermediate hot wall component of the utility model;

[0018] Figure 2 This is the second schematic diagram of the internal structure of the pressure-bearing hot wall component or the intermediate hot wall component of the utility model;

[0019] Figure 3 It is a structural schematic diagram of a first embodiment of the utility model in which an intermediate heat wall member is connected to a separation brazing block;

[0020] Figure 4 It is a structural schematic diagram of a second embodiment of the utility model in which an intermediate heat wall member is connected to a separation brazing block;

[0021] Figure 5 This is one of the overall cross-sectional views of the utility model;

[0022] Figure 6 This is the second overall cross-sectional view of the utility model;

[0023] Figure 7 A top view of a heat exchanger core end surface of the utility model with a sealing gasket placed thereon;

[0024] Figure 8 It is a three-dimensional diagram of the heat exchanger core of the utility model;

[0025] Fig. 9 It is a structural schematic diagram of the first embodiment of the hot wall heat exchanger of the utility model;

[0026] Fig.10 It is a structural schematic diagram of a second embodiment of the hot wall heat exchanger of the utility model;

[0027] Fig.11 It is a schematic structural diagram of the third embodiment of the hot wall heat exchanger of the utility model. DETAILED DESCRIPTION

[0028] like Figures 1 to 11 As shown, a novel hot wall heat exchanger includes an upper heat exchange device 1, a lower heat exchange device 2, a heat exchanger core 3, a pressure-bearing hot wall component 4, an intermediate hot wall component 5, a phase change fluid fin 6, a fluid channel layer 7, a sealing brazing block 8, a partitioning brazing block 9, a heat exchange fluid fin 10, an upper fluid inlet 11, an upper fluid outlet 12, a lower fluid inlet 13, a lower fluid outlet 14, a wall surface 15, a sealing frame 16, a sealing gasket 17, a phase change fluid injection hole 18, an air discharge hole 19, a locking screw hole 20, a fastening screw 21, a nut 22, a connecting flange 23 and a fluid containing space 24.

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figures 1 to 11 As shown, the upper heat exchange device 1 and the lower heat exchange device 2 are fixedly connected and a heat exchanger core 3 is nested in the middle. Specifically, locking screw holes 20 are opened at the four corners of the upper heat exchange device 1 and the lower heat exchange device 2, and fastening screws 21 are passed through the locking screw holes 20. Both ends of the fastening screws 21 are fixedly connected to the locking screw holes 20 through nuts 22.

[0033] like Figure 8 As shown, the heat exchanger core 3 includes two groups of integrally brazed pressure-bearing hot wall parts 4 and several groups of integrally brazed intermediate hot wall parts 5, pressure-bearing hot wall parts 4 are arranged on opposite sides of the intermediate hot wall parts 5, phase-change fluid fins 6 are sealed and brazed on the inner side of the pressure-bearing hot wall parts 4 or the intermediate hot wall parts 5, a fluid channel layer 7 is formed between the side walls of the pressure-bearing hot wall parts 4 or the intermediate hot wall parts 5, sealing brazing blocks 8 are respectively arranged at both ends of the fluid channel layer 7, a separating brazing block 9 is arranged in the middle of the fluid channel layer 7 to divide it into area A and area B, a plurality of groups of heat exchange fluid fins 10 are respectively arranged in area A and area B, the heat exchange fluid fins 10 are respectively the heat conduction fins of the two heat exchange fluids in area A and area B and construct their respective channels, the heat exchange fluid fins 10 and the phase change fluid fins 6 can both play the role of reinforcing ribs, and also play the role of fluid distribution and heat conduction.

[0034] The pressure-bearing hot wall component 4 and the intermediate hot wall component 5 both include a wall surface 15 and a sealing frame 16. The upper and lower ends of the sealing frame 16 are respectively sealed with the wall surface 15 by brazing to form a sealed space. A plurality of groups of phase-change fluid fins 6 are vertically arranged in the sealed space. The phase-change fluid fins 6 are rectangular. Specifically, in this embodiment, the wall surface 15 of the pressure-bearing hot wall component 4 is a pressure-resistant metal plate, which cooperates with the sealing frame 16 to play a supporting role. The wall surface 15, the sealing frame 16 and the phase-change fluid fins 6 are brazed as a whole.

[0035] like Figure 1 and Figure 2As shown, the sealing frame 16 is provided with a phase change fluid injection hole 18 and an air discharge hole 19, and the phase change fluid injection hole 18 and the air discharge hole 19 are arranged on the same side or different sides of the sealing frame 16. When the phase change fluid injection hole 18 is connected by a pipeline to inject the phase change fluid, the phase change fluid is gasified due to absorbing external heat and discharges the air inside the pressure-bearing hot wall part 4 or the intermediate hot wall part 5 from the air discharge hole 19, and then the phase change fluid injection hole 18 and the air discharge hole 19 are blocked to form a closed internal phase change fluid independent circulation system unit hot wall. Figure 1 and Figure 2 The direction of the arrows in the figure is a schematic diagram of the circulation route of the phase change fluid.

[0036] The upper heat exchange device 1 is provided with an upper fluid inlet 11 and an upper fluid outlet 12 on the outside, and the lower heat exchange device 2 is provided with a lower fluid inlet 13 and a lower fluid outlet 14 on the outside. The upper fluid inlet 11 is connected with the A area and forms a fluid circulation channel A together with the lower fluid outlet 14; the lower fluid inlet 13 is connected with the B area and forms a fluid circulation channel B together with the upper fluid outlet 12. Figure 5 and Figure 6 As shown, four groups of fluid containing spaces 24 are respectively formed between the heat exchanger core 3 and the upper heat exchange device 1 and the lower heat exchange device 2, wherein the upper left corner is the fluid inflow space of zone A, and the lower left corner is the fluid outflow space of zone A; the lower right corner is the fluid inflow space of zone B, and the upper right corner is the fluid outflow space of zone B. A sealing gasket 17 is nested around each fluid containing space 24 in the sealing groove of the inlet and outlet end faces of the heat exchanger core 3 and the inner contact surfaces of the upper heat exchange device 1 and the lower heat exchange device 2. The sealing groove is arranged on the corresponding nested steps of the upper heat exchange device 1 and the lower heat exchange device 2, and the heat exchange fluid inlet and outlet end faces of the heat exchanger core 3 must be machined to achieve the smooth surface required for sealing.

[0037] like Figure 3 As shown, the separated brazing block 9 is a solid block; Figure 4 As shown, the separated brazing block 9 is a hollow block. Figure 7 As shown, the sealing gasket 17 pressed against the partition brazing block 9 covers at least 80% of the surface area of ​​the partition brazing block 9, thereby preventing fluid leakage in the A zone or the B zone.

[0038] The upper fluid inlet 11, the upper fluid outlet 12, the lower fluid inlet 13 and the lower fluid outlet 14 are provided with connecting flanges 23, and the connecting flanges 23 are circular and / or square. Fig. 9 As shown, the connecting flanges 23 are all circular; Fig.10 As shown, the connecting flange 23 is a combination of a circle and a square; Fig.11As shown, the connecting flanges 23 are all square. During use, when the connecting flange 23 is round, it can adapt to the pipeline of liquid fluid, and when the connecting flange 23 is square, it can adapt to the square pipeline of gaseous fluid. Therefore, the rapid phase change cycle of the phase change fluid inside the heat wall of the heat exchanger core 3 can be used to achieve the purpose of rapid heat transfer. It can be widely used in liquid-liquid heat exchange, gas-to-gas heat exchange, or gas-to-liquid heat exchange. It has a compact structure, a high pressure-resistant operating temperature, no leakage, a small size, high heat exchange efficiency, and saves space and cost.

[0039] The structure of the utility model is more compact than that of a heat pipe and can also realize long-distance heat transmission. The two heat exchange fluids can flow separately and independently without cross contamination. The thermal reaction is more sensitive than that of a heat pipe, and the circulation mileage of the internal phase change fluid will be shorter than that of a heat pipe, the circulation speed will be faster, and the effect will be stronger. The utility model is easier to clean than the existing plate heat exchanger, and one side can be cleaned while running, or both sides can be cleaned. The two sides of the heat exchanger core 3 do not need to be separated from each other, and the cleaning speed is fast. It has the advantages of high heat flux density of heat pipes and compactness of plate heat exchangers.

[0040] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A new type of hot wall heat exchanger, characterized in that: The invention comprises an upper heat exchange device (1), a lower heat exchange device (2) and a heat exchanger core (3), wherein the upper heat exchange device (1) and the lower heat exchange device (2) are fixedly connected and the heat exchanger core (3) is nested therebetween, wherein the heat exchanger core (3) comprises two groups of integrally brazed pressure-bearing hot wall parts (4) and a plurality of groups of integrally brazed intermediate hot wall parts (5), wherein pressure-bearing hot wall parts (4) are arranged on opposite sides of the intermediate hot wall parts (5), and phase-change fluid fins (6) are sealed and brazed on the inner side of the pressure-bearing hot wall parts (4) or the intermediate hot wall parts (5), and a fluid channel layer (7) is formed between the side walls of the pressure-bearing hot wall parts (4) or the intermediate hot wall parts (5), and the fluid channel layer (7) is divided into two ends. A sealing brazing block (8) is separately provided, and a separating brazing block (9) is provided in the middle of the fluid channel layer (7) to divide it into zone A and zone B, and a plurality of groups of heat exchange fluid fins (10) are respectively provided in the zones A and B; an upper fluid inlet (11) and an upper fluid outlet (12) are provided on the outer side of the upper heat exchange device (1), and a lower fluid inlet (13) and a lower fluid outlet (14) are provided on the outer side of the lower heat exchange device (2); the upper fluid inlet (11) is connected to the zone A and together with the lower fluid outlet (14) forms a fluid circulation channel A; the lower fluid inlet (13) is connected to the zone B and together with the upper fluid outlet (12) forms a fluid circulation channel B.

2. A novel hot wall heat exchanger according to claim 1, characterized in that: The pressure-bearing hot wall component (4) and the intermediate hot wall component (5) both comprise a wall surface (15) and a sealing frame (16); the upper and lower ends of the sealing frame (16) are respectively sealed with the wall surface (15) by brazing to form a sealed space; a plurality of groups of phase-change fluid fins (6) are vertically arranged in the sealed space; the phase-change fluid fins (6) are rectangular.

3. A novel hot wall heat exchanger according to claim 2, characterized in that: A plurality of sealing grooves are arranged on the inner sides of the upper heat exchange device (1) and the lower heat exchange device (2) relative to each other, and sealing gaskets (17) are nested in the sealing grooves.

4. A novel hot wall heat exchanger according to claim 3, characterized in that: The sealing gasket (17) pressed against the separation brazing block (9) covers at least 80% of the surface area of ​​the separation brazing block (9).

5. A novel hot wall heat exchanger according to claim 3 or 4, characterized in that: The separation brazing block (9) is a solid block or a hollow block.

6. A novel hot wall heat exchanger according to claim 5, characterized in that: The sealing frame (16) is provided with a phase change fluid injection hole (18) and an air discharge hole (19), and the phase change fluid injection hole (18) and the air discharge hole (19) are arranged on the same side or different sides of the sealing frame (16).

7. A novel hot wall heat exchanger according to claim 6, characterized in that: The wall surface (15) of the pressure-bearing hot wall component (4) is a pressure-resistant metal plate.

8. A novel hot wall heat exchanger according to claim 7, characterized in that: The upper fluid inlet (11), the upper fluid outlet (12), the lower fluid inlet (13) and the lower fluid outlet (14) are provided with connecting flanges (23), and the connecting flanges (23) are circular and / or square.

9. A novel hot wall heat exchanger according to claim 8, characterized in that: The upper heat exchange device (1) and the lower heat exchange device (2) are provided with locking screw holes (20) at the four corners, and a fastening screw (21) is inserted into the locking screw hole (20). The two ends of the fastening screw (21) are fixedly connected to the locking screw hole (20) through nuts (22).

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