Brazed plate heat exchanger

Abstract

The utility model relates to heat exchanger technical field, concretely relates to brazing plate type heat exchanger, including by a plurality of metal plate brazing forming's heat exchanger body and setting at heat exchanger body one side top hot fluid input pipe, heat exchanger body one side top still is equipped with cooling liquid input pipe, heat exchanger body one side below is equipped with hot fluid output pipe, heat exchanger body one side below still is equipped with cooling liquid output pipe, heat exchanger body one side is equipped with first pressure -resisting apron, heat exchanger body other side is equipped with with first pressure -resisting apron structure same second pressure -resisting apron.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a brazed plate heat exchanger. Background Technology

[0002] Brazed plate heat exchangers are a new type of high-efficiency heat exchanger made by brazing a series of metal plates with a certain corrugated shape. It is like a "sandwich" made of dozens or even hundreds of layers of thin metal plates tightly stacked. The core structure does not have rubber gaskets. Instead, the metal plates are permanently welded into a whole by vacuum brazing technology. It is mainly composed of plates, brazing filler metal, end caps and nozzles, and a frame. The plates are usually made of corrosion-resistant materials such as stainless steel and titanium alloy, and the surface has herringbone or straight corrugations, which can enhance fluid turbulence and improve heat exchange efficiency. The brazing filler metal permanently welds all contact points of adjacent plates together. The end caps are located at both ends and have a sealing function. The nozzles are the interfaces for connecting external pipes. Finally, the whole is supported by the frame. This design allows it to work stably in a wide temperature range of -160℃ to +225℃ and in high-pressure environments up to 4.5 MPa, and has strong adaptability.

[0003] Although the existing technologies mentioned above can solve the corresponding technical problems, they still have certain drawbacks: existing heat exchangers are connected by multiple metal plates. In order to conduct heat better, the metal plates are relatively thin and their internal cavities are very small. When used in the factory, if the heat exchanger is accidentally vibrated and tilts, and the ground is relatively uneven, the metal plates of the heat exchanger are easily deformed by the impact of the protrusion, which can lead to the compression of its internal cavity or even the inability of fluid to pass through. The impact resistance is poor and it is easily damaged when used in harsh environments. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a brazed plate heat exchanger with good impact resistance and resistance to deformation of the metal plate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a brazed plate heat exchanger, comprising a heat exchanger body formed by brazing several metal plates and a hot fluid inlet pipe disposed above one side of the heat exchanger body, a coolant inlet pipe disposed above one side of the heat exchanger body, a hot fluid outlet pipe disposed below one side of the heat exchanger body, a coolant outlet pipe disposed below one side of the heat exchanger body, a first pressure-resistant guard plate disposed on one side of the heat exchanger body, and a second pressure-resistant guard plate disposed on the other side of the heat exchanger body with the same structure as the first pressure-resistant guard plate. The first pressure-resistant guard plate comprises a first rigid plate fixedly connected to one side of the heat exchanger body and a second rigid plate disposed on one side of the first rigid plate, and a compression air bladder disposed between the first rigid plate and the second rigid plate.

[0006] A further improvement is that silicone seals are provided on the edges of the first rigid plate and the edges of the second rigid plate.

[0007] A further improvement is that the silicone seal has an integrally formed deformable cavity.

[0008] A further improvement is that a pressure-reducing block is provided on the outer side of the second rigid plate.

[0009] A further improvement is that a first textile layer is fixedly bonded to one side of the inner wall of the compressed airbag, and a second textile layer is fixedly bonded to the other side of the inner wall of the compressed airbag, with a plurality of tensile fiber filaments provided between the first textile layer and the second textile layer.

[0010] A further improvement is that the bonding pressure relief block includes a base plate disposed on the outside of the second rigid plate and a plurality of bonding blocks whose outer side walls are bonded to each other and disposed on the base plate.

[0011] A further improvement is that the bottom plate is also provided with a guide frame at its edge, and the cross-section of the guide frame is a right trapezoid shape.

[0012] A further improvement is that the bonding block includes a sliding sleeve and a sliding support column slidably disposed on the inner wall of the sliding sleeve at the bottom, and the bottom end of the sliding support column is provided with a compression spring.

[0013] A further improvement is that a silicone contact block is provided at the top of the sliding support.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are as follows: When this utility model is used, a first anti-pressure guard plate and a second anti-pressure guard plate with the same structure as the first anti-pressure guard plate are provided on both sides of the heat exchanger body. During use, if the heat exchanger is tilted or impacted from the side, the pressure generated will be directly applied to the second hard plate of the first anti-pressure guard plate. The second hard plate has high hardness, so it absorbs all the pressure and transmits it to the compression air bag between the first hard plate and the second hard plate. At the same time, the pressure is evenly distributed to the heat exchanger body over a large area through the first hard plate. While buffering and absorbing the impact pressure, it disperses the pressure and prevents the heat exchanger body from being subjected to excessive pressure at a single point, which would cause dents and affect the fluid flow inside. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a three-dimensional structural schematic diagram of the heat exchanger of this utility model; Figure 2 This is a structural schematic diagram of the front view cross-section of the first pressure-resistant protective plate of this utility model; Figure 3 This is a structural schematic diagram of the front view cross-section of the pressure-reducing block of this utility model; Figure 4 This is a structural schematic diagram of the front cross-section of the bonding block of this utility model. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0018] See Figure 1-4 As shown, the technical solution adopted in this specific embodiment is: a brazed plate heat exchanger, including a heat exchanger body 1 formed by brazing several metal plates and a hot fluid inlet pipe 2 disposed on one side of the heat exchanger body 1. A coolant inlet pipe 4 is also disposed on one side of the heat exchanger body 1, and a hot fluid outlet pipe 5 and a coolant outlet pipe 3 are also disposed on one side of the heat exchanger body 1. A first pressure-resistant guard plate 6 is disposed on one side of the heat exchanger body 1, and a structure connected to the first pressure-resistant guard plate 6 is disposed on the other side of the heat exchanger body 1. The same second pressure-resistant guard plate 7, the first pressure-resistant guard plate 6 includes a first rigid plate 61 fixedly connected to one side of the heat exchanger body 1 and a second rigid plate 62 disposed on one side of the first rigid plate 61, a compression air bladder 63 is provided between the first rigid plate 61 and the second rigid plate 62, specifically, the first rigid plate 61 is welded and fixed to the edge of the metal plate of the heat exchanger body 1 by a continuous weld, the weld height is 2-3mm, to ensure connection strength and not interfere with the internal flow channel of the heat exchanger body 1; the first rigid plate 61 and the second rigid plate 62 All components are made of 2-4mm thick stainless steel or carbon steel plates, with powder-coated surfaces to enhance corrosion resistance. The compression bladder 63 is made of nitrile rubber or neoprene rubber, with a wall thickness of 1.5-2.5mm, and is filled with 0.1-0.3MPa nitrogen or air. It remains flat under normal conditions and can achieve a compression ratio of up to 60%. In use, the coolant pipe is connected to the end of the coolant output pipe 3, and the fluid requiring cooling is introduced through the pipe to the hot fluid input pipe 2. At this point, the hot fluid can be cooled through the hot fluid input pipe 2. Fluid is input into the heat exchanger body 1. The metal plates of the heat exchanger body 1 absorb the heat of the hot fluid in the hot fluid input pipe 2 and dissipate it to the coolant input pipe 4. The coolant in the coolant input pipe 4 absorbs the heat of the hot fluid, thereby lowering the temperature of the hot fluid. After passing through the heat exchanger body 1, the hot fluid is introduced into the hot fluid output pipe 5, and then the cooled hot fluid is discharged and collected. At the same time, the coolant that has absorbed heat is discharged and collected through the coolant output pipe 3. A first pressure-resistant guard plate 6 and a second pressure-resistant guard plate 7 with the same structure as the first pressure-resistant guard plate 6 are provided on both sides of the heat exchanger body 1. During use, if the heat exchanger is tilted or impacted from the side, the pressure generated will be directly applied to the second hard plate 62 of the first pressure-resistant guard plate 6. The second hard plate 62 has high hardness, so it absorbs all the pressure and transmits it to the compression air bag 63 between the first hard plate 61 and the second hard plate 62. At the same time, the pressure is evenly distributed to the heat exchanger body 1 over a large area through the first hard plate 61. While buffering and absorbing the impact pressure, the pressure is dispersed to prevent the heat exchanger body 1 from being subjected to excessive pressure at a single point and causing a dent, which would affect the fluid flow inside. Silicone sealing strips 65 are also provided on the edges of the first rigid plate 61 and the second rigid plate 62. These strips help to seal the gap between the first rigid plate 61 and the second rigid plate 62, preventing hard objects from falling and damaging the compression airbag 63. At the same time, the deformability of the silicone sealing strips 65 can further absorb impact pressure. The silicone sealing strips 65 have a Shore A hardness of 30-40 and a width of 8-12mm. They are bonded to the edges of the first rigid plate 61 and the second rigid plate 62 respectively using high-temperature resistant adhesive. The silicone seal 65 has an integrally formed deformable cavity 66. The cross-section of the deformable cavity 66 is elliptical or capsule-shaped, and it extends continuously along the length of the silicone seal 65. The cavity diameter is 2-4 mm, and its axis is parallel to the axis of the silicone seal 65. This cavity makes it easier for the silicone seal 65 to undergo elastic compression when subjected to radial pressure, thereby absorbing impact energy more efficiently. At the same time, after the pressure is released, it relies on the elasticity of the silicone itself to return to its original shape without permanent deformation. This allows the silicone seal 65 to deform more quickly, thus absorbing impact more efficiently. The outer side of the second rigid plate 62 is also provided with a pressure-reducing block 64. The pressure-reducing block 64 includes a base plate 642 disposed on the outer side of the second rigid plate 62 and a plurality of bonding blocks 643 whose outer side walls are mutually bonded and disposed on the base plate 642. Each bonding block 643 includes a sliding sleeve 52 and a sliding support 51 slidably disposed on the inner wall of the sliding sleeve 52 at the bottom. A compression spring 53 is provided at the bottom end of the sliding support 51. The bonding blocks 643 are arranged in a rectangular array or concentric circles. The sliding support 51 and the sliding sleeve 52 of each bonding block 643 are made of stainless steel. The material is fitted with a sliding fit clearance of 0.05-0.1mm; the compression spring 53 is made of piano wire with a wire diameter of 0.5-1.0mm, a free length of 10-15mm, and a spring constant of 5-10N / mm, ensuring that it can produce significant compression deformation under slight pressure. The multiple mating blocks 643 are independent of each other, and the top of the sliding support 51 is flush with the surface when not under pressure. When a hard object comes into contact, only the mating block 643 in direct contact with the hard object is compressed, while the other mating blocks 643 remain in their original shape, thus forming a shape that is compatible with the surface of the hard object. The recessed area is filled to cover and fix the hard object; the bottom of the sliding sleeve 52 of each bonding block 643 is fixed to the base plate 642, and the top of the sliding support 51 always tends to extend outward under the action of the compression spring 53. When the hard object leaves, the compression spring 53 pushes the sliding support 51 back to be flush with the surrounding bonding blocks 643, thereby restoring the flat state and preventing jamming. When the hard object contacts the middle position of the second hard plate 62, if the hard object is small, it will cause the hard object to directly press the bonding pressure relief block 64. Since the bonding pressure relief block 64 is made of Composed of multiple bonding blocks 643, when pressure is applied to the sliding support 51 of the bonding block 643, it can cause it to indent along the sliding sleeve 52 and squeeze the compression spring 53 to absorb the pressure. At the same time, the bonding pressure reducing block 64 has a depression with the same shape as the hard object. Thus, the impact generated by the hard object is reduced and absorbed, while fixing the hard object so that it will not continue to move and contact other parts of the heat exchanger. At the same time, the impact force generated by the hard object can be output more vertically to the first pressure-resistant guard plate 6, so that it can better buffer and absorb the impact. A first textile layer 67 is fixedly bonded to one side of the inner wall of the airbag 63, and a second textile layer 68 is fixedly bonded to the other side of the inner wall of the airbag 63. Several tensile fiber filaments 69 are disposed between the first textile layer 67 and the second textile layer 68. The tensile fiber filaments 69 are polyester fibers or nylon filaments with a diameter of 0.2-0.4 mm and a length equal to the height of the inner cavity of the airbag 63 in its normal state. The spacing between adjacent tensile fiber filaments 69 is 3-5 mm. Both ends are fixed to the first textile layer 67 and the second textile layer 68 by heat fusion or adhesive. The first textile layer 67 and the second textile layer 68 are both polyester or nylon woven fabrics with a basis weight of 80-120 g / m². Their surfaces are completely adhered to the inner wall of the airbag 63 by heat vulcanization or a special adhesive. When the airbag 63 is not compressed, the tensile fiber filaments 69 are in a naturally straight state, which helps to limit excessive inflation of the airbag. When the airbag 63 is compressed... When compressed by impact, the tension fiber 69 bends or relaxes as the airbag is compressed, without hindering the compression process. When the impact force disappears, the compressed airbag 63 recovers its shape by its own elasticity. At this time, the tension fiber 69 is straightened again and pulls the first textile layer 67 and the second textile layer 68, thereby preventing the airbag from bulging excessively in some areas during the rebound process and avoiding secondary impact on the metal plate of the heat exchanger body 1. When the compressed airbag 63 is not squeezed, the tension fiber 69 holds the compressed airbag 63 to maintain its stable shape. After the compressed airbag 63 is squeezed, that is, after the pressure disappears, the compressed airbag 63 will recover due to its own elasticity. During the recovery process, the tension fiber 69 pulls the inner surface of the compressed airbag 63 to prevent it from expanding excessively in the recovery process and causing the metal plate of the heat exchanger body 1 to be compressed, thus further improving the protection. The bottom plate 642 is also provided with a guide frame 641. The cross section of the guide frame 641 is a right trapezoidal shape, which is beneficial to guide the hard object to the position of the guide frame 641 by the slope of the guide frame 641, so that the hard object can hit the first anti-pressure guard plate 6 at an inclined angle, thereby reducing the vertical impact force. Combined with the friction force during sliding, the impact force is further weakened, thereby further improving the impact resistance of the heat exchanger. The top of the sliding support 51 is provided with a silicone contact block 54, which helps to increase the frictional resistance through the silicone contact block 54, so that when a hard object comes into contact with the sliding support 51, it will not continue to slide and affect the fixing effect of the hard object. At the same time, the deformation of the silicone contact block 54 further absorbs the impact force during contact.

[0019] During assembly, the compression airbag 63 is first placed between the first rigid plate 61 and the second rigid plate 62, and then the edges are sealed with silicone sealant 65. Next, tooling is used to press the first rigid plate 61 and the second rigid plate 62 to a predetermined distance, which is 80% of the thickness of the compression airbag 63. Finally, the base plate 642, which is attached to the pressure-reducing block 64, is fixed to the outside of the second rigid plate 62 by bolts or welding. The entire pressure-resistant protective plate assembly is welded or bolted to the side of the heat exchanger body 1 via the first rigid plate 61.

[0020] The working principle of this utility model is as follows: When using this utility model, the coolant pipe is connected to the end of the coolant output pipe 3, and the fluid to be cooled is input into the hot fluid input pipe 2 through the pipe. At this time, the hot fluid is input into the heat exchanger body 1 through the hot fluid input pipe 2. The metal plates of the heat exchanger body 1 absorb the heat of the hot fluid in the hot fluid input pipe 2 and dissipate it to the coolant input pipe 4. The coolant in the coolant input pipe 4 absorbs the heat of the hot fluid, thereby lowering the temperature of the hot fluid. After passing through the heat exchanger body 1, the hot fluid is guided to the hot fluid output pipe 5, where the cooled hot fluid is discharged and collected. Simultaneously, the coolant, having absorbed heat, is cooled by the cooling... The liquid discharge pipe 3 discharges and collects the liquid outward. On both sides of the heat exchanger body 1, there are first pressure-resistant plates 6 and second pressure-resistant plates 7 with the same structure as the first pressure-resistant plates 6. During use, if the heat exchanger is tilted or impacted from the side, the pressure generated will be directly applied to the second hard plate 62 of the first pressure-resistant plate 6. The second hard plate 62 has high hardness, so it absorbs all the pressure and transmits it to the compression air bladder 63 between the first hard plate 61 and the second hard plate 62. At the same time, the pressure is evenly distributed to the heat exchanger body 1 over a large area through the first hard plate 61. While buffering and absorbing the impact pressure, the pressure is dispersed to prevent the heat exchanger body 1 from being subjected to excessive pressure at a single point, which would cause dents and affect the fluid flow inside.

[0021] This utility model aims to protect the structure of the product. The model numbers of the components are not the focus of this utility model's protection, as they are common technology. Any component on the market that can achieve the functions described above can be used. Therefore, the model numbers and other parameters of the components are not described in detail in this utility model. The contribution of this utility model lies in the scientific combination of the various components.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions provided are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents. Any aspects of this utility model not detailed herein are well-known to those skilled in the art.

Claims

1. A brazed plate heat exchanger, comprising a heat exchanger body (1) formed by brazing a plurality of metal plates and a hot fluid inlet pipe (2) disposed above one side of the heat exchanger body (1), a coolant inlet pipe (4) disposed above one side of the heat exchanger body (1), a hot fluid outlet pipe (5) disposed below one side of the heat exchanger body (1), and a coolant outlet pipe (3) disposed below one side of the heat exchanger body (1), characterized in that: The heat exchanger body (1) is provided with a first pressure-resistant guard plate (6) on one side and a second pressure-resistant guard plate (7) with the same structure as the first pressure-resistant guard plate (6) on the other side. The first pressure-resistant guard plate (6) includes a first rigid plate (61) fixedly connected to one side of the heat exchanger body (1) and a second rigid plate (62) disposed on one side of the first rigid plate (61). A compression air bladder (63) is provided between the first rigid plate (61) and the second rigid plate (62).

2. The brazed plate heat exchanger according to claim 1, characterized in that: The edges of the first rigid plate (61) and the second rigid plate (62) are also provided with silicone seals (65).

3. The brazed plate heat exchanger according to claim 2, characterized in that: The silicone seal (65) has an integrally formed deformable cavity (66).

4. The brazed plate heat exchanger according to claim 1, characterized in that: The second rigid plate (62) is also provided with a pressure relief block (64) on the outside.

5. The brazed plate heat exchanger according to claim 1, characterized in that: A first textile layer (67) is fixedly bonded to one side of the inner wall of the compressed airbag (63), and a second textile layer (68) is fixedly bonded to the other side of the inner wall of the compressed airbag (63). A plurality of tensile fiber filaments (69) are provided between the first textile layer (67) and the second textile layer (68).

6. The brazed plate heat exchanger according to claim 4, characterized in that: The bonding pressure relief block (64) includes a base plate (642) disposed on the outside of the second rigid plate (62) and a plurality of bonding blocks (643) whose outer side walls are bonded to each other and disposed on the base plate (642).

7. The brazed plate heat exchanger according to claim 6, characterized in that: The bottom plate (642) is also provided with a guide frame (641) at its edge, and the cross section of the guide frame (641) is a right trapezoid shape.

8. The brazed plate heat exchanger according to claim 6, characterized in that: The bonding block (643) includes a sliding sleeve (52) and a sliding support (51) which is slidably disposed on the inner wall of the sliding sleeve (52) at the bottom. The bottom end of the sliding support (51) is provided with a compression spring (53).

9. The brazed plate heat exchanger according to claim 8, characterized in that: The top of the sliding support (51) is provided with a silicone contact block (54).

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