Carbon fiber composite plates for plate heat exchangers

Abstract

The present invention provides a carbon fiber composite plate for a plate heat exchanger, which is made of a composite material of carbon fiber reinforced resin as a whole. The four corners of the plate each have a through corner hole, and the two corner holes on the diagonal are the heat medium inlet and the heat medium outlet, and the two corner holes on the other diagonal are the refrigerant inlet and the refrigerant outlet, respectively. After being impregnated with resin, the carbon fiber is molded by a mold. While forming the two surfaces of the plate, part of the carbon fiber impregnated with resin gathers to form guide lines and edges on the protruding surface, one surface is the heat medium guide line, and the other surface is the refrigerant guide line. The present invention is light in weight and high in strength, has good thermal conductivity, uniform heat transfer, and strong corrosion resistance; the guide lines and edges are integrally formed with the surface of the plate at one time and are not easy to peel off. Not easy to chip.

Description

Technical Field

[0001] The invention relates to a plate forming technology for a plate type heat exchanger. Background Art

[0002] Plate heat exchanger is a new type of high-efficiency heat exchanger made of stacked metal plates with a certain corrugated shape. It is an ideal equipment for liquid-liquid and liquid-steam heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, wide application and long service life.

[0003] The plate heat exchanger structure consists of gaskets, compression plates (movable end plates, fixed end plates) and frames (upper and lower guide rods, front struts). The plates are sealed and guided by sealing gaskets to separate the cold / hot fluid channels. The cold / hot heat exchange media flow through their respective channels and exchange heat with the separated plates to achieve the temperature required by the user.

[0004] Each plate has openings at the four corners. After being assembled into a plate bundle, they form distribution pipes and collecting pipes for the fluid. After the cold / hot medium exchanges heat, it flows back from its respective collecting pipes for recycling.

[0005] Common plate patterns include herringbone, straight and circular patterns. The main functions of plate patterns are: to make the fluid turbulent, to enhance heat transfer, to form contact resistance points between adjacent plates, and to improve pressure resistance.

[0006] Application No.: 2020100069604 According to the present invention, a plate heat exchanger (1) for fluid circulation is provided. The exchanger (1) comprises plates (3) and a retaining frame (2) connected in pairs in a sealed manner. The exchanger (1) comprises at least one metal mesh plate (3), the metal mesh plate comprising at least one metal mesh sheet (31) and a thermosetting or thermoplastic resin coating (32) covering at least one surface of the metal mesh sheet (31). The resin coating of the heat exchange plate has poor thermal conductivity and poor mechanical strength. Summary of the invention

[0007] Purpose of the invention:

[0008] The disadvantage of the traditional steel plate heat exchanger that it is not resistant to corrosion is overcome, and a carbon fiber composite plate for a plate heat exchanger is provided which is resistant to corrosion, wear-resistant and has good heat exchange performance.

[0009] Technical solution:

[0010] The carbon fiber composite material plate for the plate type heat exchanger of the present invention is made of a composite material of carbon fiber reinforced resin as a whole. The four corners of the plate each have a through corner hole, the two corner holes on the diagonal are the heat medium inlet and the heat medium outlet, and the two corner holes on the other diagonal are the refrigerant inlet and the refrigerant outlet (such as the two corner holes above are the heat medium inlet and the refrigerant outlet, and the two corner holes below are the refrigerant inlet and the heat medium outlet).

[0011] One surface of the plate has a heat medium guide pattern that is higher than the surface, which limits the heat medium flow area and connects the heat medium inlet to the heat medium outlet; the other surface has a coolant guide pattern that is higher than the surface, which limits the coolant flow area and connects the coolant inlet to the coolant outlet.

[0012] The carbon fiber is preferably carbon fiber felt, which is convenient for paving to form the two surfaces of the plate, and is more convenient for adjusting the direction of the carbon fiber arrangement or moving and gathering. The carbon fiber impregnated with resin is molded by a mold (yin and yang mold), and while forming the surface of the plate, part of the carbon fiber impregnated with resin gathers to form the guide lines and the inlet or outlet edges of the convex surface (preferably the guide lines and the edges are of the same height).

[0013] The guide lines and the plate surface are integrally formed in one step by mold pressing, with a fast molding speed, and are finalized in the subsequent curing process. The formed guide lines have a large mechanical strength and are integrated with the substrate, which is not easy to break or peel off.

[0014] Preferably, the main arrangement directions of the carbon fibers at different parts of the carbon fiber felt are different, which are basically consistent with the running directions of the guide lines on the surface of the parts, and the carbon fibers at the parts impregnated with resin are adjusted, gathered and cured to form the guide lines at the parts.

[0015] The resin is a thermosetting resin with good heat resistance and small thermal deformation, preferably a thermosetting silicone resin (which has elasticity and can omit the need for additional sealing gaskets between the plates; and has better heat resistance than most thermosetting resins).

[0016] On one surface of the plate where the heat medium flows, most of the edges of the heat medium inlet and outlet are higher than the plate surface, and the lower edge of the heat medium inlet and the upper edge of the heat medium outlet have notches at the same height as the plate surface for the heat medium to flow out and in. On this surface, the refrigerant inlet and outlet both have edges higher than the surface to prevent the refrigerant from flowing on this surface; the edges may be equipped with sealing gaskets to assist in sealing.

[0017] On the other surface of the plate where the refrigerant flows, most of the edges of the refrigerant inlet and the refrigerant outlet are higher than the other surface of the plate, and the upper edge of the refrigerant inlet and the lower edge of the refrigerant outlet leave a gap at the same height as the other surface of the plate for the refrigerant to flow out and in. On this other surface, the heat medium inlet and the heat medium outlet both have edges higher than this surface to prevent the heat medium from flowing on this surface; this edge may also have a sealing gasket to assist in sealing.

[0018] When the plates of the present invention are stacked to form a plate heat exchanger, the plate surfaces of adjacent plates for the flow of heat medium are combined to form a larger (higher or thicker) heat medium flow space; or the plate surfaces of adjacent plates for the flow of refrigerant are combined to form a larger (higher or thicker) refrigerant flow space. The refrigerant and the heat medium flow separately and will not mix together, which is conducive to the rapid heat exchange between the large flow of refrigerant and the heat medium through the thinner plates with good heat transfer.

[0019] The edges mentioned above are at the same height as the guide lines, so that when adjacent plates are aligned, the flow channels formed by the guide lines can cover and seal each other.

[0020] Preferably, the directions of the heat medium guide lines and the cold medium guide lines of the present invention are in cross directions, in which case the heat exchange area is larger and the heat exchange effect is better.

[0021] Further preferably, the flow-guiding lines of the present invention are bulging outward (the edges of the enclosed area protrude outward from the plate), so that the refrigerant or heat medium can flow to most of the plate surface, thereby increasing the heat exchange effect between the refrigerant and the heat medium.

[0022] Beneficial effects:

[0023] The present application forms not ordinary resin lines or edges, but lines and edges of carbon fiber reinforced resin; the lines and edges have high mechanical strength, good heat resistance and high heat transfer coefficient.

[0024] The plate in this application is not made of metal material, has high corrosion resistance to chemicals such as acids, alkalis and salts, and has a long service life; it is light in weight and has high specific strength and rigidity.

[0025] Carbon fiber tow prepreg is used as the board texture, and the molding speed is fast; the guide texture and the edge have longer carbon fibers, which can maintain continuous and stable mechanical strength, and are not easy to break or chip; and the fiber and the surface of the board are an overall structure of a reinforced material, and the carbon fibers are interlaced and connected with each other, that is, the texture and the edge are formed as a whole with the board surface, which is not easy to peel off and has uniform thermal conductivity and heat transfer performance.

[0026] When multiple plates are stacked to make a plate heat exchanger, it is not easy to produce uneven deformation due to temperature changes, and it is not easy to deform and leak fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the plate heat exchanger made by the present invention;

[0028] Figure 2 It is a schematic diagram of the components of the present invention;

[0029] Figure 3 It is a three-dimensional structural schematic diagram of a plate of the present application;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of another plate of the present application.

[0031] In the figure, 1-edge; 2-notch; 3-rear clamping plate; 4-clamping bolt; 5-plate (single or stacked); 6-heat medium inlet; 7-heat medium outlet; 8-refrigerant outlet; 9-refrigerant inlet; 10-front clamping plate; 11-guiding pattern. DETAILED DESCRIPTION

[0032] Embodiment A:

[0033] like Figure 3 The plate heat exchanger shown uses a carbon fiber composite plate, and the four corners of the plate 5 have a through corner hole respectively. The upper two corner holes are the heat medium inlet 6 and the refrigerant outlet 8 respectively, and the lower two corner holes are the refrigerant inlet 9 and the heat medium outlet 7 respectively; one surface of the plate 5 has a heat medium guide pattern 11, and the other surface has a refrigerant guide pattern 11.

[0034] It is formed by impregnating carbon fiber with resin and then molding. While forming the two surfaces of the plate 5, part of the carbon fiber impregnated with resin gathers to form the guide lines 11 on the protruding surface and the edge 1 of the inlet or outlet.

[0035] On one surface of the plate 5 where the heat medium flows, the edges 1 of the heat medium inlet 6 and the heat medium outlet 7 are at the same height as the guide lines 11 and are both higher than the surface of the plate 5. The lower edge 1 of the heat medium inlet 6 and the upper edge 1 of the heat medium outlet 7 have notches 2 at the same height as the surface of the plate 5. On this surface, the refrigerant inlet 9 and the refrigerant outlet 8 both have edges 1 that are higher than the surface.

[0036] On the other surface of the plate 5 where the refrigerant flows, the upper edge 1 of the refrigerant inlet 9 and the lower edge 1 of the refrigerant outlet 8 have a notch 2 at the same height as the other surface of the plate 5; on this other surface, the heat medium inlet 6 and the heat medium outlet 7 both have edges 1 higher than this surface.

[0037] like Figure 2 As shown, after a plurality of such plates 5 are stacked (heat medium pipes are aligned), they are clamped by a front clamping plate 10, a rear clamping plate 3, and four clamping bolts 4 to form a plate heat exchanger.

[0038] Embodiment B:

[0039] In embodiment A, the flow guiding lines 11 are formed by Figure 4 The outwardly bulging shape shown enables the refrigerant or the heat medium to flow to most of the plate surface. The heat exchange flow of the refrigerant and the heat medium is larger, and the heat exchange efficiency is higher.

[0040] The heat medium inlet 6 and the heat medium outlet 7 are located at diagonally opposite corners, and the refrigerant inlet 9 and the refrigerant outlet 8 are located at diagonally opposite corners; the directions of the heat medium guide lines 11 and the refrigerant guide lines 11 are cross directions.

[0041] Multiple pieces such as Figure 4 When the plates 5 are stacked to form a plate heat exchanger, the surfaces of the adjacent plates 5 through which the heat medium flows are joined together, and the edge 1 is slightly smaller than the height of the guide lines 11. A sealing gasket is provided on the edge 1. The surfaces of the adjacent plates 5 through which the coolant flows are joined together, and the flow channels formed by the guide lines 11 are mutually covered and sealed, forming a Figure 1 The plate heat exchanger with a larger flow path of heat medium or refrigerant is shown. The refrigerant and the heat medium flow separately and will not mix together, which is conducive to rapid heat exchange between large flow refrigerant and heat medium.

Claims

1. A carbon fiber composite plate for a plate heat exchanger, wherein the four corners of the plate (5) each have a through corner hole, the two corner holes on the diagonal line are a heat medium inlet (6) and a heat medium outlet (7), and the two corner holes on the other diagonal line are a coolant inlet (9) and a coolant outlet (8); one surface of the plate (5) has a heat medium guide pattern, and the other surface has a coolant guide pattern; Features: The composite material structure is made of carbon fiber felt reinforced with thermosetting silicone resin and cured at one time under mold pressure, wherein the main arrangement direction of the carbon fibers at different locations is adjusted to be basically consistent with the direction of the guide lines (11) at the locations; while forming the two surfaces of the plate (5), some of the carbon fibers impregnated with thermosetting silicone resin gather to form the guide lines (11) protruding from the respective surfaces and the edges (1) of the heat medium or cold medium inlet or outlet.

2. The carbon fiber composite material plate for plate heat exchanger according to claim 1, Features: On the surface of a plate (5) through which the heat medium flows, most of the edges (1) of the heat medium inlet (6) and the heat medium outlet (7) are higher than the surface of the plate, and the lower edge (1) of the heat medium inlet (6) and the upper edge (1) of the heat medium outlet (7) have a notch (2) at the same height as the surface of the plate (5); on this surface, the refrigerant inlet (9) and the refrigerant outlet (8) both have intact edges (1) that are higher than the surface.

3. The carbon fiber composite material plate for plate heat exchanger according to claim 1, Features: On the surface of another plate (5) through which the refrigerant flows, most of the edges (1) of the refrigerant inlet (9) and the refrigerant outlet (8) are higher than the surface of the plate (5), and the upper edge (1) of the refrigerant inlet (9) and the lower edge (1) of the refrigerant outlet (8) have a notch (2) at the same height as the surface of the plate (5); on this other surface, the heat medium inlet (6) and the heat medium outlet (7) both have a complete edge (1) that is higher than the surface.

4. The carbon fiber composite material plate for a plate heat exchanger according to claim 1, 2 or 3, Features: The two outermost flow guiding lines (11) bulge upward and downward on the plate surface, so that the cooling medium or the heating medium flowing therein can flow through most of the plate surface.

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