A micro-circulation antifreeze device for heat exchangers

Abstract

This invention discloses a micro-circulation antifreeze device for heat exchangers, relating to the field of heat exchangers. It includes a tube body and a head shell. A tube sheet is installed inside the opening of the tube body, and a U-shaped tube bundle is installed inside the tube body. Both ends of the U-shaped tube bundle penetrate the tube sheet. An installation block is installed at the transverse centerline of the side of the tube sheet away from the U-shaped tube bundle. An inlet square pipe and an outlet square pipe are installed on the upper and lower surfaces of the installation block. The two ends of the U-shaped tube bundle are located inside the inlet and outlet square pipes, respectively. A micro-circulation component is installed inside the installation block. The pipes of the micro-circulation component are connected to the inlet and outlet square pipes, respectively. The micro-circulation component is used to circulate the water within the U-shaped tube bundle. This invention can circulate the water within the U-shaped tube bundle through the action of the micro-circulation component, preventing the water in the tube bundle from freezing due to temperature during winter maintenance, which could cause pipe deformation or breakage and affect the subsequent use of the heat exchanger.

Description

Technical Field

[0001] This invention relates to the technical field of heat exchangers, specifically to a micro-circulation antifreeze device for heat exchangers. Background Technology

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. In chemical production, heat exchangers are widely used as heaters, coolers, condensers, evaporators, and reboilers.

[0003] A U-tube heat exchanger based on existing technology includes a shell, which is a closed space composed of a top plate, a bottom plate, a tube sheet, and a side plate. The tube sheet is connected to the side plate and installed between the top plate and the bottom plate. A partition is provided in the middle of the shell, which is parallel to the top plate. A heat-conducting oil groove is provided on the tube sheet. Four baffles are provided inside the shell. Baffle 1 and Baffle 3 are welded to the upper part of the partition and connected to the top plate. Baffle 2 and Baffle 4 are welded to the lower part of the partition and connected to the bottom plate. The baffles and the tube sheet have corresponding circular holes. Several sets of parallel U-shaped heating tubes pass through the circular holes and are welded to the tube sheet and communicate with the heat-conducting oil groove.

[0004] Although existing technologies reduce the footprint and lower equipment manufacturing costs while ensuring production efficiency, the water inside the tubes may freeze due to the low temperature when the heat exchanger unit needs to be maintained in winter. This can cause the heat exchanger tubes to bend, deform, or break, and freeze, affecting the use of the tube heat exchanger. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a micro-circulation antifreeze device for heat exchangers to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A micro-circulation antifreeze device for a heat exchanger includes a tube body and a head shell. A tube sheet is installed inside the opening of the tube body. A U-shaped tube bundle is installed inside the tube body, with both ends of the U-shaped tube bundle penetrating the tube sheet. An installation block is provided at the transverse centerline of the side of the tube sheet away from the U-shaped tube bundle. An inlet square pipe and an outlet square pipe are provided on the upper and lower surfaces of the installation block. The two ends of the U-shaped tube bundle are located inside the inlet and outlet square pipes, respectively. A micro-circulation component is installed inside the installation block. The pipes of the micro-circulation component are connected to the inlet and outlet square pipes, respectively. The micro-circulation component is used to circulate the water within the U-shaped tube bundle. Two cooperating sealing gates are provided inside the ends of the inlet and outlet square pipes away from the tube sheet. Protective shells are provided on both sides of the outer wall of the opening of the tube body. A drive component is provided in each of the two protective shells. The actuator end of the drive component penetrates the tube wall and connects to the sealing gate.

[0008] The end wall of the opening end of the head housing is provided with an annular slot, which is inserted into the opening end of the tube body. The interior of the head housing is provided with a partition plate, the end of which is connected to the mounting block.

[0009] Specifically, in this technical solution, the microcirculation component includes a microcirculation pump, which is fixedly installed inside the mounting block. The bottom end of the microcirculation pump is connected to a water pumping pipe, the bottom end of which is located inside the water outlet square pipe. The top end of the microcirculation pump is connected to a drain pipe, the top end of which is located inside the water inlet square pipe.

[0010] Specifically, in this technical solution, the bottom end of the pumping pipe is a few centimeters away from the inner bottom plate of the outlet square pipe, and the top end of the drain pipe is flush with the inner bottom plate of the inlet square pipe.

[0011] Specifically, in this technical solution, each of the sealing doors penetrates both sides of the inlet and outlet square pipes and is slidably connected to them. Each of the sealing doors is provided with a first sealing strip and a second sealing strip. The first sealing strip is fused to the outer wall of the end of the sealing door, and the second sealing strip is fused to the outer wall of the centerline of the sealing door.

[0012] Specifically, the driving component includes a drive motor, which is located at the center of the outer wall of the protective shell. The output end of the drive motor passes through the wall of the protective shell and connects to a rotating shaft. A drive sprocket is fixedly fitted on the rotating shaft. Horizontal lead screws are provided on both the upper and lower sides of the rotating shaft. Driven sprockets are fixedly fitted at the ends of the two lead screws. The drive sprocket and the two driven sprockets are connected by a transmission chain. Square sleeves are fitted at the ends of the two lead screws away from the driven sprockets. The ends of the two square sleeves pass through the tube wall and are fixedly connected to the side wall of the sealing door.

[0013] Specifically, in this technical solution, the drive motor is fixedly connected to the outer wall of the protective shell by bolts, one end of the rotating shaft is fixedly connected to the output end of the drive motor, the other end of the rotating shaft is rotatably connected to the outer wall of the tube, one end of the two lead screws is rotatably connected to the inner wall of the protective shell, and the inner walls of the two square sleeves are threadedly engaged with the outer walls of the lead screws.

[0014] Specifically, in this technical solution, the outer walls of the two square sleeves near the sealing door are fused with first sealing gaskets, the two first sealing gaskets are inclined, and the outer walls of the two square sleeves near the driven sprocket are fused with second sealing gaskets.

[0015] Specifically, in this technical solution, the upper surface of the inlet square pipe and the lower surface of the outlet square pipe are both set as inclined surfaces, and a gasket is fused to the outer wall of the mounting block away from the pipe plate, and the outer wall of the gasket is in close contact with the partition plate.

[0016] Specifically, the slot is equipped with a sealing ring inside, and the outer wall of the sealing ring is in close contact with the end wall of the tube opening. The upper and lower surfaces of the tube and the end cap shell are respectively welded with a first fixing plate and a second fixing plate. The two first fixing plates are bolted to the two second fixing plates. The two end faces of the two first fixing plates are fixedly connected to the outer wall of the protective shell, and the two end faces of the two second fixing plates are in contact with the outer wall of the protective shell.

[0017] Specifically, the upper surface of the tube body is provided with a heat source outlet near the opening, the lower surface of the tube body is provided with a heat source inlet away from the opening, the inside of the tube body is provided with a baffle, and the upper and lower surfaces of the end cap shell are respectively provided with a cold source inlet and a cold source outlet.

[0018] In summary, the present invention has the following main beneficial effects:

[0019] I. This application adds an installation block and two square tubes to the tube sheet, so that when maintenance is required without hindering normal use, the sealing door can be moved by the drive component to seal the square tubes. Then, under the action of the micro-circulation component, the water in the U-shaped tube bundle is micro-circulated, which avoids the water in the tube bundle freezing due to temperature during winter maintenance, which could cause the pipes to deform or break and affect the use of the subsequent heat exchanger.

[0020] 2. By changing the connection between the tube body and the head shell, the wall of the tube body at the open end is fully inserted into the slot opened in the wall of the head shell at the open end. At this time, the second fixing plate contacts the first fixing plate and is fixed with bolts, so that the sealing ring is squeezed and deformed by the end wall of the tube body to complete the seal. At the same time, the partition squeezes the gasket to achieve the seal, thereby completing the tight installation between the tube body and the head shell. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the present invention;

[0022] Figure 2 This is an internal sectional view of the present invention;

[0023] Figure 3 This is an enlarged view of point A in the present invention;

[0024] Figure 4 This is a plan view of the tube opening of the present invention;

[0025] Figure 5 This is a diagram of the tube structure of the present invention;

[0026] Figure 6 This is a structural diagram of the end cap shell of the present invention.

[0027] Figure Descriptions: 1. Tube body; 101. Heat source inlet; 102. Heat source outlet; 103. Tube sheet; 1031. Mounting block; 1032. Inlet square tube; 1033. Outlet square tube; 1034. Inclined surface; 104. U-shaped tube bundle; 105. Baffle; 106. Protective shell; 107. First fixing plate; 2. Head shell; 201. Slot; 2011. Sealing ring; 202. Baffle; 203. Cold source inlet; 204. Cold source outlet; 20 5. Second fixed plate; 3. Microcirculation assembly; 301. Microcirculation pump; 302. Pumping pipe; 303. Drainage pipe; 4. Drive assembly; 401. Drive motor; 402. Drive sprocket; 403. Driven sprocket; 404. Transmission chain; 405. Rotating shaft; 406. Lead screw; 607. Square sleeve; 4071. First sealing gasket; 4072. Second sealing gasket; 5. Gasket; 6. Sealing door; 601. First sealing strip; 602. Second sealing strip. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The embodiments of the present invention will now be described.

[0030] Example

[0031] All electrical components in this application are controlled by an external controller.

[0032] Please see Figure 1-6A micro-circulation antifreeze device for a heat exchanger includes a tube body 1 and a head shell 2. A tube sheet 103 is installed inside the opening of the tube body 1. A U-shaped tube bundle 104 is installed inside the tube body 1, with both ends of the U-shaped tube bundle 104 penetrating the tube sheet 103. A mounting block 1031 is located at the transverse centerline of the side of the tube sheet 103 away from the U-shaped tube bundle 104. An inlet square pipe 1032 and an outlet square pipe 1033 are respectively installed on the upper and lower surfaces of the mounting block 1031. The two ends of the U-shaped tube bundle 104 are respectively... Located inside the inlet square pipe 1032 and the outlet square pipe 1033, the upper surface of the inlet square pipe 1032 and the lower surface of the outlet square pipe 1033 are both set as inclined surfaces 1034. The inclined surfaces 1034 can prevent water from remaining on the upper surface of the inlet square pipe 1032. The mounting block 1031 is equipped with a micro-circulation component 3. The pipes of the micro-circulation component 3 are connected to the inlet square pipe 1032 and the outlet square pipe 1033 respectively. The micro-circulation component 3 is used to micro-circulate the water in the U-shaped tube bundle 104. The water flows in a circulating manner. Two matching sealing gates 6 are provided inside the ends of the inlet square pipe 1032 and the outlet square pipe 1033 furthest from the pipe plate 103. Protective shells 106 are provided on both sides of the outer wall of the opening of the pipe body 1. A drive assembly 4 is provided in each of the two protective shells 106. The actuating end of the drive assembly 4 penetrates the pipe wall of the pipe body 1 and connects to the sealing gate 6. Each sealing gate 6 penetrates both sides of the inlet square pipe 1032 and the outlet square pipe 1033 and is slidably connected to them. Each sealing gate 6 has... Each is provided with a first sealing strip 601 and a second sealing strip 602. The first sealing strip 601 is fused to the outer wall of the end of the sealing door 6, and the second sealing strip 602 is fused to the outer wall of the center line of the sealing door 6. The initial state of the sealing door 6 is the separated state. At this time, the second sealing strip 602 is in close contact with the contact part of the square tube (where the sealing door 6 passes through the square tube) to achieve sealing. The tube plate 103 overlaps the protruding protrusion on the inner wall of the tube body 1 and is restricted by the end of the end cap shell 2 after installation.

[0033] The end wall of the open end of the head shell 2 is provided with an annular slot 201, which is inserted into the open end of the tube body 1. The interior of the head shell 2 is provided with a partition 202 in the transverse direction. The end of the partition 202 is connected to the mounting block 1031. A gasket 5 is fused to the outer wall of the mounting block 1031 away from the tube sheet 103. The outer wall of the gasket 5 is in close contact with the partition 202.

[0034] The slot 201 is equipped with a sealing ring 2011 inside. The outer wall of the sealing ring 2011 is in close contact with the end wall of the opening end of the tube body 1. The upper and lower surfaces of the tube body 1 and the end cap shell 2 are respectively welded with a first fixing plate 107 and a second fixing plate 205. The two first fixing plates 107 are bolted to the two second fixing plates 205. The two end faces of the two first fixing plates 107 are fixedly connected to the outer wall of the protective shell 106. The two end faces of the two second fixing plates 205 are in contact with the outer wall of the protective shell 106. The upper surface of the tube body 1 is provided with a heat source outlet 102 near the opening. The lower surface of the tube body 1 is provided with a heat source inlet 101 away from the opening. The tube body 1 is equipped with a baffle 105 inside. The upper and lower surfaces of the end cap shell 2 are respectively provided with a cold source inlet 203 and a cold source outlet 204.

[0035] During winter maintenance of the U-shaped heat exchanger, the operator starts the drive assembly 4 via an external controller. The actuator in the drive assembly 4 moves laterally, pushing the sealing door 6 within the inlet square pipe 1032 and the outlet square pipe 1033 until the sealing door 6 closes. At this time, the first sealing strip 601 is in close contact with the outer wall of the two square pipes, sealing the contact area between the sealing door 6 and the square pipes to prevent leakage. Meanwhile, the micro-circulation assembly 3 works to send water from the U-shaped tube bundle 104 into the outlet square pipe 1033 into the inlet square pipe 1032 and into the port of the U-shaped tube bundle 104. Through micro-circulation, the water in the U-shaped tube bundle 104 flows, preventing freezing due to temperature, which could cause pipe deformation or breakage and affect the subsequent use of the heat exchanger.

[0036] Then, the workers used tools to separate the end cap shell 2 and the tube body 1, and pulled the end cap shell 2 outward so that the end of the tube body 1 moved out of the slot 201, completing the disassembly. Then, the tube plate 103 was pulled outward, and the tube plate 103 moved the U-shaped tube bundle 104 out of the tube body 1 together, which made it easier for the workers to maintain the inside of the tube body 1. In this way, by changing the connection form between the tube body 1 and the end cap shell 2, the tight installation between them was completed.

[0037] Please see Figure 3 The microcirculation component 3 includes a microcirculation pump 301, which is fixedly installed inside the mounting block 1031. The bottom end of the microcirculation pump 301 is connected to a water suction pipe 302, which is located inside the water outlet square pipe 1033. The top end of the microcirculation pump 301 is connected to a drain pipe 303, which is located inside the water inlet square pipe 1032. The bottom end of the water suction pipe 302 is 3cm away from the inner bottom plate of the water outlet square pipe 1033, and the top end of the drain pipe 303 is flush with the inner bottom plate of the water inlet square pipe 1032.

[0038] When the micro-circulation component 3 is working, its internal circulation pump 301 starts. The suction generated by the circulation pump 301 draws water from the U-shaped tube bundle 104 into the outlet square pipe 1033 through the water pumping pipe 302, and sends it into the inlet square pipe 1032 through the drain pipe 303. Under the pumping pressure of the circulation pump 301, the water re-enters the U-shaped tube bundle 104, realizing the flow of water and thus preventing the water in the U-shaped tube bundle 104 from freezing.

[0039] Please see Figure 1 , Figure 4 and Figure 5 The drive assembly 4 includes a drive motor 401, which is located at the center of the outer wall of the protective shell 106. The output end of the drive motor 401 passes through the wall of the protective shell 106 and connects to a rotating shaft 405. A drive sprocket 402 is fixedly sleeved on the rotating shaft 405. Horizontal lead screws 406 are provided on both the upper and lower sides of the rotating shaft 405. Driven sprockets 403 are fixedly sleeved at the ends of the two lead screws 406. The drive sprocket 402 and the two driven sprockets 403 are connected by a transmission chain 404. Square sleeves 607 are sleeved at the ends of the two lead screws 406 away from the driven sprockets 403. The ends of the two square sleeves 607 penetrate the wall of the tube body 1. The body is fixedly connected to the side wall of the sealing door 6. The drive motor 401 is fixedly connected to the outer wall of the protective shell 106 by bolts. One end of the rotating shaft 405 is fixedly connected to the output end of the drive motor 401, and the other end of the rotating shaft 405 is rotatably connected to the outer wall of the tube body 1. One end of each of the two lead screws 406 is rotatably connected to the inner wall of the protective shell 106. The inner walls of the two square sleeves 607 are threadedly engaged with the outer walls of the lead screws 406. Each of the two square sleeves 607 near the outer wall of the sealing door 6 has a first sealing gasket 4071 welded to it. The two first sealing gaskets 4071 are inclined. The outer walls of the ends of the two square sleeves 607 near the driven sprockets 403 have a second sealing gasket 4072 welded to them. The diameter of the drive sprocket 402 is larger than the diameter of the two driven sprockets 403, and the diameters of the two driven sprockets 403 are the same.

[0040] When the drive assembly 4 is working, the drive motor 401 starts, and its output end drives the rotating shaft 405 to rotate. The rotating shaft 405 drives the drive sprocket 402 to rotate. The rotating drive sprocket 402 drives the two driven sprockets 403 to rotate through the transmission chain 404. The two driven sprockets 403 drive the lead screw 406 to rotate. The rotating lead screw 406 causes the threaded square sleeve 607 to move laterally under the constraint of the through-hole. The moving square sleeve 607 drives the sealing door 6 to move, completing the closing and opening of the sealing door 6 for the water inlet square pipe 1032 and the water outlet square pipe 1033. (When the sealing door 6 is in the closed state, the second sealing gasket 4072 on the square sleeve 607 seals the through-hole. When the sealing door 6 is in the open state, the first sealing gasket 4071 on the square sleeve 607 seals the through-hole.)

[0041] The working principle of this invention is as follows:

[0042] During winter maintenance of the U-shaped heat exchanger, the operator starts the drive assembly 4 via an external controller. The drive motor 401 starts, and its output drives the rotating shaft 405 to rotate. The rotating shaft 405 drives the drive sprocket 402 to rotate. The rotating drive sprocket 402 drives two driven sprockets 403 to rotate via a transmission chain 404. Both driven sprockets 403 drive the lead screw 406 to rotate. The rotating lead screw 406 causes the threaded square sleeve 607 to move laterally within the constraint of the through-hole. The moving square sleeve 607 moves the sealing door 6, completing the sealing process. When the door 6 closes the inlet square pipe 1032 and the outlet square pipe 1033, the first sealing strip 601 is in close contact with the outer wall of the two square pipes, sealing the contact part between the sealing door 6 and the square pipe to prevent water leakage. Then, the micro-circulation component 3 is controlled by the external controller to start the circulation pump 301. The suction generated by the circulation pump 301 draws water from the U-shaped tube bundle 104 into the outlet square pipe 1033 through the water pumping pipe 302, and sends it into the inlet square pipe 1032 through the drain pipe 303. Under the pumping pressure of the circulation pump 301, the water re-enters the U-shaped tube bundle 104, realizing the flow of water.

[0043] Finally, the staff used tools to remove the bolts that fixed the first fixing plate 107 and the second fixing plate 205, pulled the end cap housing 2 outward so that the end of the tube body 1 moved out of the slot 201, and completed the disassembly. Then, the tube plate 103 was pulled outward, and the tube plate 103 moved the U-shaped tube bundle 104 out of the tube body 1 together, so that the staff could carry out maintenance on the inside of the tube body 1.

[0044] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A micro-circulation antifreeze device for a heat exchanger, comprising a tube body (1) and a head shell (2), characterized in that, The tube body (1) has a tube plate (103) inside its opening. A U-shaped tube bundle (104) is located inside the tube body (1), with both ends of the U-shaped tube bundle (104) penetrating the tube plate (103). A mounting block (1031) is located at the transverse centerline of the side of the tube plate (103) away from the U-shaped tube bundle (104). An inlet square pipe (1032) and an outlet square pipe (1033) are located on the upper and lower surfaces of the mounting block (1031). The two ends of the U-shaped tube bundle (104) are located inside the inlet square pipe (1032) and the outlet square pipe (1033), respectively. A microcirculation component is located inside the mounting block (1031). (3) The pipeline of the micro-circulation component (3) is connected to the inlet square pipe (1032) and the outlet square pipe (1033) respectively. The micro-circulation component (3) is used to circulate the water in the U-shaped tube bundle (104). The inlet square pipe (1032) and the outlet square pipe (1033) are provided with two matching sealing doors (6) at the ends away from the tube sheet (103). The outer walls of the opening of the tube body (1) are provided with protective shells (106). The two protective shells (106) are provided with driving components (4). The execution end of the driving components (4) penetrates the tube wall of the tube body (1) and is connected to the sealing door (6). The end wall of the opening end of the head housing (2) is provided with an annular slot (201), the slot (201) is inserted into the opening end of the tube body (1), and the interior of the head housing (2) is provided with a partition (202) in the transverse direction, the end of the partition (202) is connected to the mounting block (1031).

2. The micro-circulation antifreeze device for heat exchangers according to claim 1, characterized in that, The microcirculation component (3) includes a microcirculation pump (301), which is fixedly installed in the mounting block (1031). The bottom end of the microcirculation pump (301) is connected to a water pumping pipe (302), the bottom end of which is located inside the water outlet square pipe (1033). The top end of the microcirculation pump (301) is connected to a drain pipe (303), the top end of which is located inside the water inlet square pipe (1032).

3. The micro-circulation antifreeze device for a heat exchanger according to claim 2, characterized in that, The bottom end of the pumping pipe (302) is 3cm away from the inner bottom plate of the outlet square pipe (1033), and the top end of the drain pipe (303) is flush with the inner bottom plate of the inlet square pipe (1032).

4. The micro-circulation antifreeze device for heat exchangers according to claim 1, characterized in that, Each of the sealing doors (6) penetrates and slides through the two side walls of the inlet square pipe (1032) and the outlet square pipe (1033). Each of the sealing doors (6) is provided with a first sealing strip (601) and a second sealing strip (602). The first sealing strip (601) is fused to the outer wall of the end of the sealing door (6), and the second sealing strip (602) is fused to the outer wall of the center line of the sealing door (6).

5. A micro-circulation antifreeze device for a heat exchanger according to claim 1, characterized in that, The drive assembly (4) includes a drive motor (401), which is located at the center of the outer wall of the protective shell (106). The output end of the drive motor (401) passes through the wall of the protective shell (106) and is connected to a rotating shaft (405). A drive sprocket (402) is fixedly sleeved on the rotating shaft (405). A horizontal lead screw (406) is provided on both the upper and lower sides of the rotating shaft (405). A driven sprocket (403) is fixedly sleeved at the end of each of the two lead screws (406). The drive sprocket (402) and the two driven sprockets (403) are connected by a transmission chain (404). A square sleeve (607) is sleeved at the end of each of the two lead screws (406) away from the driven sprockets (403). The ends of the two square sleeves (607) pass through the wall of the tube (1) and are fixedly connected to the side wall of the sealing door (6).

6. A micro-circulation antifreeze device for a heat exchanger according to claim 5, characterized in that, The drive motor (401) is fixedly connected to the outer wall of the protective shell (106) by bolts. One end of the rotating shaft (405) is fixedly connected to the output end of the drive motor (401), and the other end of the rotating shaft (405) is rotatably connected to the outer wall of the tube body (1). One end of the two lead screws (406) is rotatably connected to the inner wall of the protective shell (106), and the inner walls of the two square sleeves (607) are threadedly engaged with the outer walls of the lead screws (406).

7. A micro-circulation antifreeze device for a heat exchanger according to claim 5, characterized in that, The outer walls of the two square sleeves (607) near the sealing door (6) are each welded with a first sealing gasket (4071), the two first sealing gaskets (4071) are arranged at an angle, and the outer walls of the two square sleeves (607) near the end of the driven sprocket (403) are welded with a second sealing gasket (4072).

8. A micro-circulation antifreeze device for a heat exchanger according to claim 1, characterized in that, The upper surface of the inlet square pipe (1032) and the lower surface of the outlet square pipe (1033) are both set as inclined surfaces (1034). The outer wall of the mounting block (1031) away from the tube sheet (103) is welded with a gasket (5), and the outer wall of the gasket (5) is in close contact with the partition plate (202).

9. A micro-circulation antifreeze device for a heat exchanger according to claim 1, characterized in that, The slot (201) is provided with a sealing ring (2011) inside. The outer wall of the sealing ring (2011) is in close contact with the end wall of the opening end of the tube body (1). The upper and lower surfaces of the tube body (1) and the end cap shell (2) are respectively welded with a first fixing plate (107) and a second fixing plate (205). The two first fixing plates (107) are bolted to the two second fixing plates (205). The two end faces of the two first fixing plates (107) are fixedly connected to the outer wall of the protective shell (106). The two end faces of the two second fixing plates (205) are in contact with the outer wall of the protective shell (106).

10. A micro-circulation antifreeze device for a heat exchanger according to claim 1, characterized in that, The upper surface of the tube (1) is provided with a heat source outlet (102) near the opening, and the lower surface of the tube (1) is provided with a heat source inlet (101) away from the opening. The inside of the tube (1) is provided with a baffle plate (105). The upper and lower surfaces of the end cap shell (2) are respectively provided with a cold source inlet (203) and a cold source outlet (204).

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