Plate type heat exchanger capable of recycling waste heat

Abstract

The invention belongs to the technical field of plate heat exchangers, and particularly relates to a plate heat exchanger capable of recycling waste heat, which comprises a plate heat exchange device, and the surface of the plate heat exchange device is provided with a hot fluid inlet, a cold fluid inlet, a hot fluid outlet and a cold fluid outlet. The hot fluid inlet is located above the hot fluid outlet, the cold fluid inlet is located above the cold fluid outlet, and an air pressure adjusting assembly is arranged on one side of the plate type heat exchange device. The air tightness of the waste heat recovery box is maintained, energy loss is reduced, oxidation and corrosion are prevented, the performance of equipment and heat conduction liquid is protected, it is ensured that all parts of the heat conduction liquid can be evenly heated, dirt adhering to the surface of a pipeline is effectively removed, and heat resistance increase caused by dirt accumulation is avoided; therefore, heat can be efficiently transferred between the heat conduction pipe and the heat conduction liquid.

Description

Technical Field

[0001] The invention belongs to the technical field of plate heat exchangers, and in particular relates to a plate heat exchanger capable of recovering waste heat. Background Art

[0002] Under the background of increasingly scarce global resources and increasing environmental awareness, various industries have reached an unprecedented height in their pursuit of efficient use of energy and sustainable development. If the large amount of waste heat generated in the production process can be effectively recovered and reused, it can not only significantly reduce energy consumption and negative impact on the environment, but also bring considerable economic benefits to enterprises. As an efficient heat exchange equipment, plate heat exchangers are widely used in various industrial processes to achieve heat transfer between different fluids, thereby recovering waste heat. The existing waste heat recovery system, when processing the waste heat liquid flowing out of the plate heat exchanger, usually only performs preliminary heat transfer on the high-temperature fluid, but ignores the large amount of heat energy still remaining in the waste heat liquid discharged from the plate heat exchanger. Although the temperature of the reaction liquid after one heat exchange is reduced, it still has a high waste heat. If the energy contained in it cannot be further effectively recovered and utilized, it will cause a huge waste of energy.

[0003] Therefore, a plate heat exchanger capable of recovering waste heat is designed to solve the above problems. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a plate heat exchanger capable of recovering waste heat, which can effectively solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a plate heat exchanger capable of recovering waste heat, comprising a plate heat exchange device, wherein a hot fluid inlet, a cold fluid inlet, a hot fluid outlet and a cold fluid outlet are arranged on the surface of the plate heat exchange device, wherein the hot fluid inlet is located above the hot fluid outlet, and the cold fluid inlet is located above the cold fluid outlet; A gas pressure regulating assembly is provided on one side of the plate heat exchanger, and the gas pressure regulating assembly includes a waste heat recovery box provided on one side of the plate heat exchanger and an upper heat conducting pipe, a lower heat conducting pipe, an outer rectangular sleeve, an inner rectangular sleeve, an upper connecting rod, a sealing piston, a rectangular baffle, a stepped counterweight, an upper counterweight, a side pressure plate, a spring and a tilting rod for recovering waste heat from the plate heat exchanger; A stirring assembly is arranged inside the waste heat recovery box, and the stirring assembly includes a stirring rod arranged inside the waste heat recovery box and a longitudinal shaft, a shaft sleeve and a hemispherical ball for stirring the liquid inside the waste heat recovery box through the stirring rod; A cleaning assembly is arranged inside the waste heat recovery box, and the cleaning assembly includes a longitudinal rod, an upper right-angle rod, an upper scraping ring, a lower scraping ring, a lower right-angle rod, a connecting column, a hollow rod, an auxiliary tube, a tooth plate and a gear for scraping dirt off the internal pipe of the waste heat recovery box.

[0006] As a preferred plate heat exchanger capable of recovering waste heat of the present invention, a central connecting plate is fixedly connected to one side of the plate heat exchange device, and a waste heat recovery box is fixedly connected to one end of the central connecting plate away from the plate heat exchange device, an upper heat conducting pipe and a lower heat conducting pipe are horizontally inserted in the interior of the waste heat recovery box, the upper heat conducting pipe is located above the lower heat conducting pipe, and the two ends of the upper heat conducting pipe and the lower heat conducting pipe respectively pass through the waste heat recovery box, an outer rectangular sleeve is inserted in the upper mounting groove opened on the upper surface of the waste heat recovery box, the outer rectangular sleeve is fixedly connected to the waste heat recovery box, an inner rectangular sleeve is inserted in the rectangular plug-in groove opened on the upper surface of the outer rectangular sleeve, the inner rectangular sleeve and the outer rectangular sleeve are slidably connected, a sealing piston is inserted in the interior of the inner rectangular sleeve, the sealing piston and the inner rectangular sleeve are sealingly and slidably connected, an upper connecting rod is fixedly connected to the upper surface of the sealing piston, an upper counterweight is fixedly connected to the top of the upper connecting rod, and a one-way valve is installed in the socket opened on the upper surface of the waste heat recovery box.

[0007] As a preferred plate heat exchanger capable of recovering waste heat according to the present invention, a stepped counterweight is sleeved on the surface of the upper connecting rod, the stepped counterweight is slidably connected to the upper connecting rod, the stepped counterweight is located above the inner rectangular sleeve, two rectangular baffles are fixedly connected to the inside of the inner rectangular sleeve, a plurality of air holes are equidistantly provided on both sides of the outer rectangular sleeve, and a sealing rubber plug is inserted into the liquid inlet hole provided on the upper surface of the waste heat recovery box.

[0008] As a preferred plate-type heat exchanger capable of recovering waste heat of the present invention, the embedded slide bars are respectively inserted into the embedded slide grooves opened on both sides of the stepped counterweight block, and a spring is arranged in the space formed by the built-in slide bar and the stepped counterweight block, and both ends of the spring are respectively fixedly connected to the built-in slide bar and the stepped counterweight block, and the ends of the two built-in slide bars away from each other are respectively fixedly connected to the side pressure plates. The upper surface of the built-in slide bar is fixedly connected to the second U-shaped block, and the surface of the upper connecting rod is sleeved with the first U-shaped block, and the inside of the second U-shaped block is inserted with a tilting rod, and the end of the tilting rod away from the second U-shaped block is inserted in the auxiliary slot opened on the surface of the first U-shaped block, and the two ends of the tilting rod are respectively rotatably connected to the second U-shaped block and the first U-shaped block by an axle pin, and the second U-shaped block and the stepped counterweight block are slidably connected.

[0009] As a preferred plate heat exchanger capable of recovering waste heat according to the present invention, a first bent connecting pipe is installed at one end of the cold fluid inlet, and the end of the first bent connecting pipe away from the cold fluid inlet is fixedly connected to one end of the upper heat conduction pipe, and a second bent connecting pipe is installed at one end of the hot fluid outlet, and the end of the second bent connecting pipe away from the hot fluid outlet is fixedly connected to one end of the lower heat conduction pipe.

[0010] As a preferred plate heat exchanger capable of recovering waste heat according to the present invention, two arc-shaped grooves are provided on the upper surface of the outer rectangular sleeve, and the bottom end of the side pressure plate is in an arc shape.

[0011] As a preferred plate heat exchanger capable of recovering waste heat according to the present invention, the bottom surface of the sealing piston is fixedly connected to a longitudinal axis, the surface of the longitudinal axis is sleeved with a limit rod, the limit rod and the longitudinal axis are slidably connected, the two ends of the limit rod are respectively fixedly connected to an outer rectangular sleeve, the surface of the longitudinal axis is sleeved with a shaft sleeve, the surface of the shaft sleeve is fixedly connected with two stirring rods, the stirring rod is located between the upper heat conduction tube and the lower heat conduction tube, the surface of the longitudinal axis is provided with a spiral groove, a hemispherical ball is arranged inside the spiral groove, the hemispherical ball is fixedly connected to the inside of the shaft sleeve, and the hemispherical ball and the longitudinal axis are slidably connected.

[0012] As a preferred plate heat exchanger capable of recovering waste heat in the present invention, the surface of the shaft sleeve is provided with two bearings, the surface of the outer ring of the bearing is fixedly connected to two positioning rods, the two ends of the positioning rods are respectively fixedly connected to the waste heat recovery box, and the positioning rods are parallel to the upper heat conduction pipe.

[0013] As a preferred plate-type heat exchanger capable of recovering waste heat according to the present invention, an auxiliary tube is arranged inside the waste heat recovery box, a positioning auxiliary rotating rod is inserted inside the auxiliary tube, one end of the positioning auxiliary rotating rod is fixedly connected to the waste heat recovery box, a gear is fixedly sleeved on the surface of the auxiliary tube, a tooth plate is meshingly connected on the surface of the gear, a rectangular sliding rod is inserted in a rectangular longitudinal groove opened inside the tooth plate, the bottom end of the rectangular sliding rod is fixedly connected to the waste heat recovery box, the rectangular sliding rod is slidably connected to the tooth plate, a bottom connecting plate is fixedly connected to the surface of the tooth plate, and the bottom connecting plate is fixedly connected to the bottom end of the longitudinal axis.

[0014] As a preferred plate heat exchanger capable of recovering waste heat of the present invention, the surface of the upper heat conducting tube is sleeved with an upper scraper ring, and the upper scraper ring is slidably connected to the upper heat conducting tube, the surface of the outer ring of the upper scraper ring is fixedly connected with an upper right-angle rod, the surface of the lower heat conducting tube is sleeved with a lower scraper ring, the lower scraper ring is slidably connected to the lower heat conducting tube, the surface of the outer ring of the lower scraper ring is fixedly connected with a lower right-angle rod, the end of the upper right-angle rod away from the upper scraper ring is fixedly connected to a longitudinal rod, the end of the lower right-angle rod away from the lower scraper ring is fixedly connected to the longitudinal rod, the end of the auxiliary tube is fixedly connected to a hollow rod, a connecting column is inserted into the interior of the hollow rod, the connecting column is fixedly connected to the longitudinal rod, the connecting column and the hollow rod are slidably connected, and the hollow rod is located between the upper scraper ring and the longitudinal rod.

[0015] Compared with the prior art, the invention has the following beneficial effects: the invention has a scientific and reasonable structure and is safe and convenient to use: 1. An air pressure regulating component is provided, which uses the cooperation of the sealing piston, the upper counterweight, the side pressure plate and other components to accurately sense the air pressure changes caused by the temperature rise of the heat transfer liquid in the waste heat recovery box, automatically control the opening and closing of the air holes, maintain the air pressure stable, avoid excessive air pressure in the waste heat recovery box, and prevent damage to the upper and lower heat transfer pipes. By recovering the waste heat from the liquid with waste heat flowing out of the plate heat exchange device, the waste heat recovery effect is further guaranteed to avoid waste of resources; Through the cooperation of the inner rectangular sleeve, the outer rectangular sleeve and the sealing piston, the air tightness of the waste heat recovery box is maintained, energy loss is reduced, oxidation and corrosion are prevented, and the performance of the equipment and the heat transfer liquid is protected.

[0016] 2. A stirring assembly is provided, and the stirring rod rotates in the waste heat recovery box to form convection in the heat transfer liquid, breaking the temperature stratification phenomenon that may occur during the heat transfer process, and ensuring that all parts of the heat transfer liquid can be heated evenly. This effectively improves the overall temperature uniformity in the waste heat recovery box, avoids the occurrence of local overheating or overcooling areas, and improves the efficiency and stability of waste heat recovery.

[0017] 3. A cleaning component is provided. The upper scraper ring and the lower scraper ring can slide back and forth on the surface of the upper heat pipe and the lower heat pipe respectively under the drive of the longitudinal rod, the right-angle rod, the gear, the tooth plate and other structures. This process effectively removes the dirt adhering to the surface of the pipe, avoids the increase of thermal resistance caused by the accumulation of dirt, thereby ensuring that heat can be efficiently transferred between the heat pipe and the heat transfer liquid, and maintaining the efficient operation of the waste heat recovery system; The presence of dirt not only affects the heat transfer efficiency, but may also cause damage to the heat pipe due to chemical corrosion, electrochemical corrosion, etc., which reduces the risk of pipeline corrosion, extends the service life of the upper heat pipe, the lower heat pipe and the entire waste heat recovery system, and reduces the maintenance and replacement costs of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Sectional view at AA in the middle; Figure 3 For the present invention Figure 2 The enlarged view of point A in the middle; Figure 4 For the present invention Figure 2 The enlarged view of point B in the middle; Figure 5 For the present invention Figure 2 Enlarged view of point C in the middle; Figure 6 It is a schematic diagram of the structure of the upper scraper ring and the longitudinal rod in the present invention; Figure 7 It is a schematic diagram of the structure of the shaft sleeve and the stirring rod in the present invention; Figure 8 It is a schematic diagram of the structure of the hollow rod and the connecting column in the present invention; Fig. 9 It is a schematic structural diagram of the first bent connecting pipe and the upper heat conducting pipe in the present invention; Fig.10 It is a schematic structural diagram of the first U-shaped block and the tilting rod in the present invention; Fig.11 It is a schematic diagram of the structure of the spring and the built-in slide rod in the present invention; Fig.12 It is a schematic diagram of the structure of the inner rectangular sleeve and the rectangular baffle in the present invention; In the figure: 1. Plate heat exchange device; 2. Hot fluid inlet; 3. Cold fluid inlet; 4. Hot fluid outlet; 5. Cold fluid outlet; 6. Air pressure regulating assembly; 61. Upper heat conducting pipe; 62. Lower heat conducting pipe; 63. Waste heat recovery box; 64. Outer rectangular sleeve; 65. Inner rectangular sleeve; 66. Rectangular plug-in slot; 67. Upper connecting rod; 68. Sealing piston; 69. Air hole; 610. Upper mounting slot; 611. One-way valve; 612. Rectangular baffle; 613. Stepped counterweight; 614. Upper counterweight; 615. Side pressure plate; 616. Built-in slide bar; 617. Arc groove; 618. Embedded slide; 619. Spring; 620. Tilt rod; 621. First U-shaped block; 622. Second U-shaped block; 623. First bent connecting pipe; 624. Second bent connecting pipe; 625. Auxiliary slot; 626. Middle connecting plate; 627. Sealing rubber plug; 7. stirring assembly; 71. limiting rod; 72. longitudinal axis; 73. spiral groove; 74. bushing; 75. stirring rod; 76. bearing; 77. positioning rod; 78. hemispherical ball; 8. Cleaning assembly; 81. Longitudinal rod; 82. Upper right-angle rod; 83. Upper scraper ring; 84. Lower scraper ring; 85. Lower right-angle rod; 86. Connecting column; 87. Hollow rod; 88. Auxiliary tube; 89. Rectangular sliding rod; 810. Tooth plate; 811. Rectangular longitudinal groove; 812. Gear; 813. Positioning auxiliary rotating rod; 814. Bottom connecting plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example: Figure 1 - Fig.12 As shown, the present invention provides a technical solution, a plate heat exchanger capable of recovering waste heat, comprising a plate heat exchange device 1, a hot fluid inlet 2, a cold fluid inlet 3, a hot fluid outlet 4 and a cold fluid outlet 5 are arranged on the surface of the plate heat exchange device 1, the hot fluid inlet 2 is located above the hot fluid outlet 4, and the cold fluid inlet 3 is located above the cold fluid outlet 5; A gas pressure regulating assembly 6 is provided on one side of the plate heat exchange device 1. The gas pressure regulating assembly 6 includes a waste heat recovery box 63, an upper heat conduction pipe 61, a lower heat conduction pipe 62, an outer rectangular sleeve 64, an inner rectangular sleeve 65, an upper connecting rod 67, a sealing piston 68, a rectangular baffle 612, a stepped counterweight block 613, an upper counterweight block 614, a side pressure plate 615, a spring 619, a tilting rod 620, a one-way valve 611, a built-in sliding rod 616, a first U-shaped block 621, a second U-shaped block 622, a first bent connecting pipe 623, a second bent connecting pipe 624, a central connecting plate 626 and a sealing plug 627. A central connecting plate 626 is fixedly connected to one side of the plate heat exchange device 1, and a waste heat recovery box 63 is fixedly connected to the end of the central connecting plate 626 away from the plate heat exchange device 1. An upper connecting plate 626 is inserted laterally into the interior of the waste heat recovery box 63. The heat conducting pipe 61 and the lower heat conducting pipe 62, the upper heat conducting pipe 61 is located above the lower heat conducting pipe 62, and the two ends of the upper heat conducting pipe 61 and the lower heat conducting pipe 62 respectively pass through the waste heat recovery box 63, an outer rectangular sleeve 64 is inserted into the upper installation groove 610 opened on the upper surface of the waste heat recovery box 63, the outer rectangular sleeve 64 and the waste heat recovery box 63 are fixedly connected, an inner rectangular sleeve 65 is inserted into the rectangular plug-in groove 66 opened on the upper surface of the outer rectangular sleeve 64, the inner rectangular sleeve 65 and the outer rectangular sleeve 64 are slidably connected, a sealing piston 68 is inserted into the inner rectangular sleeve 65, the sealing piston 68 and the inner rectangular sleeve 65 are sealingly and slidably connected, an upper connecting rod 67 is fixedly connected to the upper surface of the sealing piston 68, and an upper counterweight block 614 is fixedly connected to the top of the upper connecting rod 67, and a one-way valve 611 is installed in the socket opened on the upper surface of the waste heat recovery box 63.

[0021] A stepped counterweight 613 is sleeved on the surface of the upper connecting rod 67, and the stepped counterweight 613 and the upper connecting rod 67 are slidably connected. The stepped counterweight 613 is located above the inner rectangular sleeve 65, and two rectangular baffles 612 are fixedly connected to the inside of the inner rectangular sleeve 65. A plurality of air holes 69 are equidistantly provided on both sides of the outer rectangular sleeve 64, and a sealing plug 627 is inserted into the liquid inlet hole provided on the upper surface of the waste heat recovery box 63.

[0022] Built-in slide bars 616 are respectively inserted into the embedded slide grooves 618 opened on both sides of the stepped counterweight block 613, and a spring 619 is arranged in the space formed by the built-in slide bar 616 and the stepped counterweight block 613. The two ends of the spring 619 are respectively fixedly connected to the built-in slide bar 616 and the stepped counterweight block 613, and the ends of the two built-in slide bars 616 that are away from each other are respectively fixedly connected to the side pressure plates 615, and the upper surface of the built-in slide bar 616 is fixedly connected to the second U-shaped block 62 2. A first U-shaped block 621 is sleeved on the surface of the upper connecting rod 67, a tilting rod 620 is inserted into the interior of the second U-shaped block 622, one end of the tilting rod 620 away from the second U-shaped block 622 is inserted into an auxiliary slot 625 opened on the surface of the first U-shaped block 621, two ends of the tilting rod 620 are rotatably connected to the second U-shaped block 622 and the first U-shaped block 621 through axle pins, and the second U-shaped block 622 is slidably connected to the stepped counterweight block 613.

[0023] A first bent connecting pipe 623 is installed at one end of the cold fluid inlet 3, and the end of the first bent connecting pipe 623 away from the cold fluid inlet 3 is fixedly connected to one end of the upper heat conduction pipe 61, and a second bent connecting pipe 624 is installed at one end of the hot fluid outlet 4, and the end of the second bent connecting pipe 624 away from the hot fluid outlet 4 is fixedly connected to one end of the lower heat conduction pipe 62.

[0024] Two arc-shaped grooves 617 are formed on the upper surface of the outer rectangular sleeve 64 , and the bottom end of the side pressure plate 615 is in an arc shape.

[0025] A stirring assembly 7 is arranged inside the waste heat recovery box 63, and the stirring assembly 7 includes a stirring rod 75, a longitudinal shaft 72, a sleeve 74 and a hemispherical ball 78, a limiting rod 71, a bearing 76 and a positioning rod 77. The bottom surface of the sealing piston 68 is fixedly connected with the longitudinal shaft 72, and the surface of the longitudinal shaft 72 is sleeved with a limiting rod 71, and the limiting rod 71 and the longitudinal shaft 72 are slidably connected. The two ends of the limiting rod 71 are respectively fixedly connected to the outer rectangular sleeve 64, and the surface of the longitudinal shaft 72 is sleeved with a sleeve 74. The surface of the sleeve 74 is fixedly connected with two stirring rods 75, and the stirring rod 75 is located between the upper heat conducting pipe 61 and the lower heat conducting pipe 62. A spiral groove 73 is opened on the surface of the longitudinal shaft 72, and a hemispherical ball 78 is arranged inside the spiral groove 73. The hemispherical ball 78 is fixedly connected to the inside of the sleeve 74, and the hemispherical ball 78 and the longitudinal shaft 72 are slidably connected.

[0026] Two bearings 76 are sleeved on the surface of the shaft sleeve 74 , and two positioning rods 77 are fixedly connected to the surface of the outer ring of the bearing 76 . The two ends of the positioning rods 77 are respectively fixedly connected to the waste heat recovery box 63 , and the positioning rods 77 are parallel to the upper heat conduction pipe 61 .

[0027] The waste heat recovery box 63 is provided with a cleaning assembly 8 inside, and the cleaning assembly 8 includes a longitudinal rod 81, an upper right-angle rod 82, an upper scraper ring 83, a lower scraper ring 84, a lower right-angle rod 85, a connecting column 86, a hollow rod 87, an auxiliary tube 88, a tooth plate 810, a gear 812, a positioning auxiliary rotating rod 813 and a bottom connecting plate 814. The waste heat recovery box 63 is provided with an auxiliary tube 88 inside, and a positioning auxiliary rotating rod 813 is inserted inside the auxiliary tube 88. One end of the positioning auxiliary rotating rod 813 is It is fixedly connected to the waste heat recovery box 63, and a gear 812 is fixedly sleeved on the surface of the auxiliary tube 88. A tooth plate 810 is meshingly connected to the surface of the gear 812. A rectangular slide bar 89 is inserted into a rectangular longitudinal groove 811 opened inside the tooth plate 810. The bottom end of the rectangular slide bar 89 is fixedly connected to the waste heat recovery box 63, and the rectangular slide bar 89 is slidably connected to the tooth plate 810. A bottom connecting plate 814 is fixedly connected to the surface of the tooth plate 810, and the bottom connecting plate 814 is fixedly connected to the bottom end of the longitudinal shaft 72.

[0028] An upper scraper ring 83 is sleeved on the surface of the upper heat-conducting tube 61, and the upper scraper ring 83 and the upper heat-conducting tube 61 are slidably connected. An upper right-angle rod 82 is fixedly connected to the surface of the outer ring of the upper scraper ring 83. A lower scraper ring 84 is sleeved on the surface of the lower heat-conducting tube 62, and the lower scraper ring 84 and the lower heat-conducting tube 62 are slidably connected. A lower right-angle rod 85 is fixedly connected to the surface of the outer ring of the lower scraper ring 84. One end of the upper right-angle rod 82 away from the upper scraper ring 83 is fixedly connected to the longitudinal rod 81, and one end of the lower right-angle rod 85 away from the lower scraper ring 84 is fixedly connected to the longitudinal rod 81. The end of the auxiliary tube 88 is fixedly connected to the hollow rod 87, and a connecting column 86 is inserted into the inside of the hollow rod 87. The connecting column 86 and the longitudinal rod 81 are fixedly connected, and the connecting column 86 and the hollow rod 87 are slidably connected. The hollow rod 87 is located between the upper scraper ring 83 and the longitudinal rod 81.

[0029] It should be noted that a friction pad is arranged between the outer rectangular sleeve 64 and the inner rectangular sleeve 65. When the force applied to the inner rectangular sleeve 65 is small, the inner rectangular sleeve 65 cannot slide inside the outer rectangular sleeve 64. Then, the inner rectangular sleeve 65 can be moved downward when a force is applied to the inner rectangular sleeve 65 by the stepped counterweight block 613.

[0030] Working principle: the external hot fluid is connected to the hot fluid inlet 2 through a pipe, the hot fluid discharge pipe is connected to the end of the lower heat conducting pipe 62, the external cold fluid is connected to the end of the upper heat conducting pipe 61 through a pipe, and the cold fluid discharge pipe is connected to the end of the cold fluid outlet 5; Under the action of the plate heat exchange device 1, heat exchange can be performed on the external hot fluid and the cold fluid. After the heat exchange, the hot fluid flows out from the plate heat exchange device 1 and flows into the lower heat pipe 62. Under the action of the heat conductivity of the lower heat pipe 62, the heat transfer liquid in the waste heat recovery box 63 is heated. The heated heat transfer liquid preheats the upper heat transfer pipe 61 to recover the waste heat of the hot fluid after the heat exchange. The recovered waste heat is used to heat the cold fluid through the heat transfer liquid, thereby ensuring the heat exchange efficiency of the plate heat exchanger. In order to ensure the efficiency of waste heat recovery, that is, the efficiency of heat conduction, the thickness of the upper heat transfer pipe 61 and the lower heat transfer pipe 62 are relatively thin. The heat-conducting liquid is heated inside the waste heat recovery box 63. The increase in the temperature of the heat-conducting liquid causes the gas inside the waste heat recovery box 63 to expand, thereby causing the sealing piston 68 to slide upward inside the inner rectangular sleeve 65. During the sliding process, under the action of the gravity of the stepped counterweight block 613, the sealing piston 68 moves upward, causing the inner rectangular sleeve 65 to not move synchronously with the sealing piston 68. At the same time, during the upward movement of the sealing piston 68, the upper counterweight block 614 is driven to move upward synchronously through the upper connecting rod 67, thereby releasing the force applied by the upper counterweight block 614 to the first U-shaped block 621. In the absence of external force, the first U-shaped block 621 causes the built-in slide rod 616 to slide toward the inside of the embedded slide groove 618 under the action of the elastic potential energy of the spring 619. The movement of the built-in slide rod 616 drives the side pressure plate 615 to move synchronously until the side pressure plate 615 and the surface of the outer rectangular sleeve 64 are in contact. As the temperature of the liquid inside the waste heat recovery box 63 continues to increase, the sealing piston 68 continues to move upward. When the sealing piston 68 moves to fit the bottom surface of the stepped counterweight 613, the stepped counterweight 613 moves upward as the sealing piston 68 moves. When the bottom end of the side pressure plate 615 is higher than the upper surface of the outer rectangular sleeve 64, the bottom of the side pressure plate 615 can be located directly above the arc groove 617 under the action of the elastic potential energy of the spring 619. During the continuous upward movement of the sealing piston 68, when the sealing piston 68 and the rectangular baffle 612 are fitted, as the sealing piston 68 moves, the inner rectangular sleeve 65 is driven to move upward through the rectangular baffle 612. During the movement of the inner rectangular sleeve 65 inside the outer rectangular sleeve 64, when the inner rectangular sleeve 65 moves to a position where its bottom is higher than the air hole 69, the gas inside the waste heat recovery box 63 can flow to the outside along the inside of the air hole 69, thereby reducing the air pressure generated by the temperature increase of the heat-conducting liquid inside the waste heat recovery box 63. As the air pressure inside the waste heat recovery box 63 decreases, the upper connecting rod 67 can drive the sealing piston 68 to move downward under the action of the gravity of the upper counterweight block 614. During the downward movement of the sealing piston 68, the stepped counterweight block 613 is driven to move downward synchronously, so that the bottom end of the side pressure plate 615 can be inserted into the inside of the arc-shaped groove 617, thereby achieving support for the stepped counterweight block 613 through the two side pressure plates 615. When no weight is applied to the inner rectangular sleeve 65, as the sealing piston 68 moves, relying on the friction between the inner rectangular sleeve 65 and the outer rectangular sleeve 64, the inner rectangular sleeve 65 will not move downward synchronously with the sealing piston 68, so that the gas inside the waste heat recovery box 63 can be continuously discharged from the inside of the air hole 69, so that the sealing piston 68 can continue to move downward. When the upper counterweight block 614 moves to fit the upper surface of the first U-shaped block 621, as the upper counterweight block 614 moves downward, it drives the first U-shaped block 621 to move downward synchronously. The movement of the first U-shaped block 621 drives the built-in sliding rod 616 to slide inside the embedded sliding groove 618 through the inclined rod 620. The movement of the built-in sliding rod 616 drives the side pressure plate 615 to move synchronously, so that the side pressure plate 615 can be moved from the inside of the arc groove 617. When the side pressure plate 615 slides out from the upper surface of the outer rectangular sleeve 64, the stepped counterweight block 613 moves down quickly under the action of the gravity of the stepped counterweight block 613, and the stepped counterweight block 613 moves downward to drive the inner rectangular sleeve 65 to move downward synchronously, so that the inner rectangular sleeve 65 and the bottom wall of the rectangular plug-in slot 66 fit together, that is, the inner rectangular sleeve 65 blocks the air hole 69. At this time, the heat-conducting liquid with a certain temperature inside the waste heat recovery box 63 continues to increase the air pressure inside the waste heat recovery box 63, and then the sealing piston 68 can continue to move upward, so as to achieve the effect of the vertical reciprocating movement of the sealing piston 68, which is beneficial to ensure the airtightness of the waste heat recovery box 63 while alleviating the strong air pressure generated inside the waste heat recovery box 63, so as to avoid the problem of damage to the upper heat-conducting pipe 61 and the lower heat-conducting pipe 62 caused by the high air pressure inside the waste heat recovery box 63; When the sealing piston 68 moves vertically, the hemispherical ball 78 can slide inside the spiral groove 73 under the action of the spiral groove 73 and the shape of the hemispherical ball 78, thereby driving the shaft sleeve 74 to rotate. The rotation of the shaft sleeve 74 drives the stirring rod 75 to rotate synchronously, that is, when the sealing piston 68 drives the longitudinal shaft 72 to move upward, the stirring rod 75 can rotate clockwise, and when the sealing piston 68 drives the longitudinal shaft 72 to move downward, the stirring rod 75 can rotate counterclockwise. The stirring rod 75 rotates inside the waste heat recovery box 63, which can stir the heat-conducting liquid inside the waste heat recovery box 63, so that the heat-conducting liquid inside the waste heat recovery box 63 can be heated evenly, thereby ensuring the efficiency of waste heat recovery. When the sealing piston 68 drives the longitudinal shaft 72 to move vertically back and forth, the movement of the longitudinal shaft 72 drives the tooth plate 810 to move upward through the bottom connecting plate 814. The tooth plate 810 slides on the surface of the rectangular slide bar 89 during the movement, thereby enabling the tooth plate 810 to move vertically back and forth. The vertical reciprocating movement of the toothed plate 810 drives the gear 812 meshing with it to rotate reciprocatingly. The rotation of the gear 812 drives the auxiliary tube 88 to rotate on the surface of the positioning auxiliary rotating rod 813. The rotation of the auxiliary tube 88 drives the hollow rod 87 to rotate synchronously, thereby making the connecting column 86 slide inside the hollow rod 87. In the process of the hollow rod 87 rotating around the positioning auxiliary rotating rod 813 as the axis, the longitudinal rod 81 can move horizontally back and forth. The movement of the longitudinal rod 81 drives the upper scraper ring 83 through the upper right-angle rod 82 and the lower right-angle rod 85. The upper scraper ring 83 and the lower scraper ring 84 move synchronously, so that the upper scraper ring 83 slides on the surface of the upper heat conducting tube 61, and the lower scraper ring 84 slides on the surface of the lower heat conducting tube 62. The upper scraper ring 83 and the lower scraper ring 84 can clean the dirt adhering to the tube during the movement, which is beneficial to the reciprocating movement of the upper scraper ring 83 and the lower scraper ring 84 in the process of recovering the waste heat of the plate heat exchanger, so as to achieve the effect of cleaning the dirt adhering to the tube, and avoid the problem that the surface scaling of the upper heat conducting tube 61 and the lower heat conducting tube 62 affects the waste heat recovery efficiency; When the plate heat exchanger is finished using, as the temperature of the heat transfer liquid inside the waste heat recovery box 63 continues to decrease, external gas can flow into the waste heat recovery box 63 along the inside of the one-way valve 611, and the direction of the gas flowing inside the one-way valve 611 is irreversible, thereby avoiding the problem of deformation of the upper heat transfer pipe 61 and the lower heat transfer pipe 62 caused by the negative pressure inside the waste heat recovery box 63; By removing the sealing plug 627 from the surface of the waste heat recovery box 63, the heat-conducting liquid inside the waste heat recovery box 63 can be extracted, thereby achieving the effect of cleaning the dirt inside the waste heat recovery box 63, and heat-conducting liquid can be added to the inside of the waste heat recovery box 63. In the present design, the heat-conducting liquid can be water.

[0031] By recovering the waste heat from the liquid with waste heat flowing out of the plate heat exchanger, the effect of waste heat recovery is further guaranteed and waste of resources is avoided.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plate heat exchanger capable of recovering waste heat, comprising a plate heat exchange device (1), wherein a hot fluid inlet (2), a cold fluid inlet (3), a hot fluid outlet (4) and a cold fluid outlet (5) are arranged on the surface of the plate heat exchange device (1), wherein the hot fluid inlet (2) is located above the hot fluid outlet (4), and the cold fluid inlet (3) is located above the cold fluid outlet (5); Features: A gas pressure regulating assembly (6) is provided on one side of the plate heat exchange device (1), and the gas pressure regulating assembly (6) comprises a waste heat recovery box (63) provided on one side of the plate heat exchange device (1) and an upper heat conducting pipe (61) for recovering waste heat from the plate heat exchanger, a lower heat conducting pipe (62), an outer rectangular sleeve (64), an inner rectangular sleeve (65), an upper connecting rod (67), a sealing piston (68), a rectangular baffle (612), a stepped counterweight (613), an upper counterweight (614), a side pressure plate (615), a spring (619) and a tilting rod (620); A stirring assembly (7) is arranged inside the waste heat recovery box (63), and the stirring assembly (7) comprises a stirring rod (75) arranged inside the waste heat recovery box (63), and a longitudinal shaft (72), a shaft sleeve (74), and a hemispherical ball (78) for stirring the liquid inside the waste heat recovery box (63) through the stirring rod (75); A cleaning assembly (8) is arranged inside the waste heat recovery box (63), and the cleaning assembly (8) comprises a longitudinal rod (81) for scraping dirt from the internal pipe of the waste heat recovery box (63), an upper right-angle rod (82), an upper scraping ring (83), a lower scraping ring (84), a lower right-angle rod (85), a connecting column (86), a hollow rod (87), an auxiliary tube (88), a tooth plate (810) and a gear (812).

2. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: A central connecting plate (626) is fixedly connected to one side of the plate heat exchange device (1); an end of the central connecting plate (626) away from the plate heat exchange device (1) is fixedly connected to a waste heat recovery box (63); an upper heat conducting pipe (61) and a lower heat conducting pipe (62) are transversely inserted into the interior of the waste heat recovery box (63); the upper heat conducting pipe (61) is located above the lower heat conducting pipe (62); and both ends of the upper heat conducting pipe (61) and the lower heat conducting pipe (62) respectively penetrate the waste heat recovery box (63); an outer rectangular sleeve (64) is inserted into an upper mounting groove (610) provided on the upper surface of the waste heat recovery box (63); the outer rectangular sleeve (64) and The waste heat recovery box (63) is fixedly connected, an inner rectangular sleeve (65) is inserted into a rectangular insertion groove (66) provided on the upper surface of the outer rectangular sleeve (64), the inner rectangular sleeve (65) and the outer rectangular sleeve (64) are slidably connected, a sealing piston (68) is inserted into the interior of the inner rectangular sleeve (65), the sealing piston (68) and the inner rectangular sleeve (65) are sealingly slidably connected, an upper connecting rod (67) is fixedly connected to the upper surface of the sealing piston (68), an upper counterweight (614) is fixedly connected to the top end of the upper connecting rod (67), and a one-way valve (611) is installed in the insertion hole provided on the upper surface of the waste heat recovery box (63).

3. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: The surface of the upper connecting rod (67) is sleeved with a stepped counterweight (613), the stepped counterweight (613) and the upper connecting rod (67) are slidably connected, the stepped counterweight (613) is located above the inner rectangular sleeve (65), two rectangular baffles (612) are fixedly connected inside the inner rectangular sleeve (65), a plurality of air holes (69) are equidistantly provided on both sides of the outer rectangular sleeve (64), and a sealing rubber plug (627) is inserted into the liquid inlet hole provided on the upper surface of the waste heat recovery box (63).

4. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: Built-in slide bars (616) are respectively inserted into the embedded slide grooves (618) opened on both sides of the stepped counterweight block (613), and a spring (619) is arranged in the space formed by the built-in slide bar (616) and the stepped counterweight block (613). The two ends of the spring (619) are respectively fixedly connected to the built-in slide bar (616) and the stepped counterweight block (613), and the ends of the two built-in slide bars (616) that are away from each other are respectively fixedly connected to the side pressure plates (615), and the upper surface of the built-in slide bar (616) is fixedly connected to the second U-shaped block (622). ), a first U-shaped block (621) is sleeved on the surface of the upper connecting rod (67), a tilting rod (620) is inserted into the interior of the second U-shaped block (622), and one end of the tilting rod (620) away from the second U-shaped block (622) is inserted into an auxiliary slot (625) provided on the surface of the first U-shaped block (621), and two ends of the tilting rod (620) are rotatably connected to the second U-shaped block (622) and the first U-shaped block (621) respectively through axle pins, and the second U-shaped block (622) is slidably connected to the stepped counterweight block (613).

5. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: A first bent connecting tube (623) is installed at one end of the cold fluid inlet (3), and an end of the first bent connecting tube (623) away from the cold fluid inlet (3) is fixedly connected to one end of the upper heat conducting tube (61); a second bent connecting tube (624) is installed at one end of the hot fluid outlet (4), and an end of the second bent connecting tube (624) away from the hot fluid outlet (4) is fixedly connected to one end of the lower heat conducting tube (62).

6. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: Two arc-shaped grooves (617) are formed on the upper surface of the outer rectangular sleeve (64), and the bottom end of the side pressure plate (615) is in an arc shape.

7. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: The bottom surface of the sealing piston (68) is fixedly connected to a longitudinal axis (72); a limiting rod (71) is sleeved on the surface of the longitudinal axis (72); the limiting rod (71) and the longitudinal axis (72) are slidably connected; two ends of the limiting rod (71) are respectively fixedly connected to the outer rectangular sleeve (64); a shaft sleeve (74) is sleeved on the surface of the longitudinal axis (72); two stirring rods (75) are fixedly connected to the surface of the shaft sleeve (74); the stirring rods (75) are located between the upper heat conducting tube (61) and the lower heat conducting tube (62); a spiral groove (73) is provided on the surface of the longitudinal axis (72); a hemispherical ball (78) is arranged inside the spiral groove (73); the hemispherical ball (78) is fixedly connected to the inside of the shaft sleeve (74); the hemispherical ball (78) and the longitudinal axis (72) are slidably connected.

8. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: Two bearings (76) are sleeved on the surface of the shaft sleeve (74), and two positioning rods (77) are fixedly connected to the surface of the outer ring of the bearing (76), and the two ends of the positioning rods (77) are respectively fixedly connected to the waste heat recovery box (63), and the positioning rods (77) are parallel to the upper heat conduction pipe (61).

9. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: An auxiliary tube (88) is provided inside the waste heat recovery box (63), and a positioning auxiliary rotating rod (813) is inserted inside the auxiliary tube (88), and one end of the positioning auxiliary rotating rod (813) is fixedly connected to the waste heat recovery box (63). A gear (812) is fixedly sleeved on the surface of the auxiliary tube (88), and a tooth plate (810) is meshingly connected on the surface of the gear (812). A rectangular sliding rod (89) is inserted into a rectangular longitudinal groove (811) provided inside the tooth plate (810), and the bottom end of the rectangular sliding rod (89) is fixedly connected to the waste heat recovery box (63), and the rectangular sliding rod (89) and the tooth plate (810) are slidably connected. A bottom connecting plate (814) is fixedly connected to the surface of the tooth plate (810), and the bottom connecting plate (814) is fixedly connected to the bottom end of the longitudinal axis (72).

10. The plate heat exchanger capable of recovering waste heat according to claim 1, characterized in that: The surface of the upper heat conducting tube (61) is sleeved with an upper scraper ring (83), the upper scraper ring (83) and the upper heat conducting tube (61) are slidably connected, the surface of the outer ring of the upper scraper ring (83) is fixedly connected with an upper right-angle rod (82), the surface of the lower heat conducting tube (62) is sleeved with a lower scraper ring (84), the lower scraper ring (84) and the lower heat conducting tube (62) are slidably connected, the surface of the outer ring of the lower scraper ring (84) is fixedly connected with a lower right-angle rod (85), and the upper right-angle rod (82) is away from the upper scraper ring (83). One end of the lower right-angle rod (85) is fixedly connected to a longitudinal rod (81); one end of the lower right-angle rod (85) away from the lower scraper ring (84) is fixedly connected to the longitudinal rod (81); the end of the auxiliary tube (88) is fixedly connected to a hollow rod (87); a connecting column (86) is inserted into the interior of the hollow rod (87); the connecting column (86) and the longitudinal rod (81) are fixedly connected; the connecting column (86) and the hollow rod (87) are slidably connected; the hollow rod (87) is located between the upper scraper ring (83) and the longitudinal rod (81).

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