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CN-224215906-U - Brazed plate heat exchanger

CN224215906UCN 224215906 UCN224215906 UCN 224215906UCN-224215906-U

Abstract

The utility model provides a brazing type plate heat exchanger, which relates to the technical field of heat exchangers and comprises a heat exchanger main body and plates, wherein a plurality of plates are arranged in the heat exchanger main body, angle holes are formed in four corners of each plate, a guide plate is arranged near the edge of each angle hole, a hexagonal micro-pit is formed in a brazing area of each plate, the corrugated angle on each plate is gradually reduced from an inlet 60 DEG to the center, and spiral corrugations with opposite directions of rotation of adjacent plates are matched to form three-dimensional vortex, so that the turbulence effect is enhanced, the low-speed flow area is reduced, the heat exchange efficiency is improved, meanwhile, a semi-ellipsoidal guide boss forms transverse secondary flow in the center area of each plate, a thermal boundary layer is damaged, heat transfer is enhanced, and the heat exchange coefficient of a low-flow area is improved.

Inventors

  • Gu Chuangsheng
  • WANG XIAOMING
  • WANG YONGFENG

Assignees

  • 江苏绍通设备制造有限公司

Dates

Publication Date
20260508
Application Date
20250604

Claims (8)

  1. 1. The brazing type plate heat exchanger comprises a heat exchanger main body (1) and plates (2), wherein a plurality of plates (2) are arranged in the heat exchanger main body (1), and the brazing type plate heat exchanger is characterized in that corner holes (201) are formed in four corners of each plate (2), a deflector (202) is arranged near the edge of each corner hole (201), and hexagonal micro-pits (203) are formed in a brazing area of each plate (2).
  2. 2. A brazed plate heat exchanger according to claim 1, wherein the plate (2) is provided with corrugations (204), the corrugations (204) are of a spiral diverging structure, the inlet angle of the corrugations (204) is 60 DEG, and the inlet angle tapers towards the center of the plate (2).
  3. 3. The brazed plate heat exchanger according to claim 1, wherein spiral corrugations (204) of adjacent plates (2) are opposite in rotation direction, a flow guide boss (205) is arranged at the center of each plate (2), the flow guide boss (205) is semi-ellipsoidal, and the flow guide bosses (205) of adjacent plates (2) are arranged in a staggered mode.
  4. 4. A brazed plate heat exchanger according to claim 1, wherein the inner wall of the angular hole (201) is provided with spiral guide grooves (206), and the pitch of the spiral guide grooves (206) is 5mm.
  5. 5. A brazed plate heat exchanger according to claim 1, wherein the root of the deflector (202) is mounted at a distance of 5-10mm from the edge of the corner hole (201) by means of a laser micro-welding spot, and the head of the deflector (202) is suspended and swingable.
  6. 6. The brazed plate heat exchanger according to claim 1, wherein the root of the guide plate (202) is provided with a semicircular notch, and the minimum clearance between the root of the guide plate (202) and the outer wall of the connecting pipe of the heat exchanger main body (1) is larger than 2mm.
  7. 7. The brazed plate heat exchanger according to claim 1, wherein the back surface of the deflector (202) is provided with a plurality of arc-shaped micro ribs (207), the initial state of the deflector (202) is parallel to the plate (2), and the opening and closing angle of the deflector (202) is 0 ° -30 °.
  8. 8. The brazed plate heat exchanger according to claim 1, wherein the hexagonal micro-pits (203) are honeycomb-shaped, a brazing filler metal filling groove is preset in the hexagonal micro-pits (203), the depth of the brazing filler metal filling groove is 0.1mm, and the edges of the hexagonal micro-pits (203) are in slope transition.

Description

Brazed plate heat exchanger Technical Field The utility model relates to the technical field of heat exchangers, in particular to a brazed plate type heat exchanger. Background The brazing plate type heat exchanger is a novel efficient heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes and brazing, thin rectangular channels are formed among various sheets, and heat exchange is carried out through the sheets. In conventional plate heat exchanger designs, the flow channel design of the corrugated plate is relatively single, resulting in uneven fluid distribution and easy formation of low-velocity flow zones in certain areas, thereby reducing overall heat exchange efficiency. This means that the equipment does not fully develop the necessary heat exchange capacity during actual operation, which affects the performance and efficiency of the system, another significant problem with brazed plate heat exchangers is the stress concentration of the brazing interface. In the process of long-term thermal cycling, microcracks are easily generated at the soldered joint, so that the tightness of the heat exchanger is reduced, the service life of the heat exchanger is shortened, the local stress concentration is challenging to the reliability and stability of equipment, especially in industrial environments requiring frequent switching of working temperature and pressure, in addition, the flow distribution of the corner areas is also not ideal, the utilization rate of partial flow channels is low, the pressure drop loss is increased, the energy consumption is increased due to the low-efficiency design, and the load of a pumping device is increased, so that the overall performance and economy of the system are further influenced. Disclosure of utility model The utility model aims to solve the defects in the prior art, in the traditional plate heat exchanger design, the flow channel of the corrugated plate sheet is single, so that the fluid is not distributed uniformly, and a low-speed flow area is easy to form in certain areas, thereby reducing the overall heat exchange efficiency. This means that the equipment does not fully develop the necessary heat exchange capacity during actual operation, which affects the performance and efficiency of the system, another significant problem with brazed plate heat exchangers is the stress concentration of the brazing interface. In the process of long-term thermal cycling, microcracks are easily generated at the soldered joint, so that the tightness of the heat exchanger is reduced, the service life of the heat exchanger is shortened, the local stress concentration is challenging to the reliability and stability of equipment, especially in industrial environments requiring frequent switching of working temperature and pressure, in addition, the flow distribution of the corner areas is also unsatisfactory, the utilization rate of partial flow channels is low, the pressure drop loss is increased, and the low-efficiency design not only increases the energy consumption, but also increases the load of a pumping device, so that the overall performance and the economy of the system are further influenced. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The utility model provides a brazed plate heat exchanger, includes heat exchanger main part and slab, install a plurality of slab in the heat exchanger main part, the angular hole has all been seted up to four corners of slab, every the guide plate is installed near the edge in angular hole, hexagonal micro-pit has been seted up to the brazing area of slab. Further, the plate is provided with a ripple which is of a spiral gradually-expanding structure, the angle of the ripple inlet is 60 degrees, and the angle of the inlet is gradually reduced towards the center of the plate. Further, spiral waves of adjacent plates are opposite in rotation direction, a flow guide boss is arranged at the center of each plate, the flow guide boss is a semi-ellipsoid, and the flow guide bosses of the adjacent plates are arranged in a staggered mode. Further, a spiral diversion trench is processed on the inner wall of the angle hole, and the pitch of the spiral diversion trench is 5mm. Furthermore, the root of the guide plate is arranged at the position 5-10mm away from the edge of the angle hole through a laser micro-welding spot, and the head of the guide plate is suspended and can swing. Further, a semicircular notch is formed in the root of the guide plate, and the minimum gap between the root of the guide plate and the outer wall of the connecting pipe of the heat exchanger main body is larger than 2mm. Further, a plurality of arc-shaped micro ribs are arranged on the back surface of the guide plate, the initial state of the guide plate is parallel to the plate sheet, and the opening and closing angle of the guide plate is 0-30 degrees. Furthermore, the hexagonal m