CN114199048A

CN114199048A - Heat exchanger convenient to clearance

Info

Publication number: CN114199048A
Application number: CN202210023544.4A
Authority: CN
Inventors: 陆金英
Original assignee: SHANGHAI KAIAO MACHINERY CO Ltd
Current assignee: SHANGHAI KAIAO MACHINERY CO Ltd
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-03-18

Abstract

The application discloses a heat exchanger convenient to clean, which comprises a radiator framework, a plurality of baffle plates, a plurality of heat transfer pipes and two positioning plates, wherein the two positioning plates are fixed at two ends of the radiator framework and are connected to two ends of the plurality of heat transfer pipes in parallel, the plurality of heat transfer pipes penetrate through the plurality of baffle plates in parallel, and the plurality of baffle plates are alternatively flush with one end face of each positioning plate; a main surrounding plate and a sealing plate are arranged in the radiator framework, the main surrounding plate is fixed between the two positioning plates, the sealing plate is fixed on the main surrounding plate, a cleaning hole is formed in the main surrounding plate, and a sealing assembly is detachably connected to the main surrounding plate; when a plurality of baffle plates are cleaned, the sealing assembly is disassembled, cleaning liquid is sprayed into the main coaming through the cleaning holes, and the cleaning liquid is sprayed to the heat transfer pipe when the heat transfer pipe is cleaned. This application has the advantage of being convenient for clear up.

Description

Heat exchanger convenient to clearance

Technical Field

The application belongs to the technical field of heat exchangers, and particularly relates to a heat exchanger convenient to clean.

Background

A heat exchanger (also called heat exchanger) is a device that transfers part of the heat of a hot fluid to a cold fluid. The heat exchanger plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production, can be used as a heater, a cooler, a condenser, an evaporator, a reboiler and the like in chemical industry production, and is widely applied.

The basic types of heat exchangers can be divided into direct contact type, heat accumulation type and dividing wall type according to heat transfer forms, the basic types of the heat exchangers are various, but the dividing wall type heat exchanger is most widely applied at present, the dividing wall type heat exchanger is characterized in that two fluids with different temperatures flow in a space separated by a wall surface and are not mixed, and heat exchange is carried out between the two fluids through heat conduction of the wall surface and convection of the fluids on the wall surface. The dividing wall type heat exchanger includes shell-and-tube type, double-tube type, heat-tube type and graphite type heat exchangers.

The existing heat exchangers of different types are difficult to avoid the scale deposition inside and outside the tubes after being used for a short time, and the normal use of the equipment can be seriously influenced. The heat exchanger washs scale removal work needs very professionally serious and troublesome, general user unit is unable enough qualified cleaning work more, need professional company to clear up, form huge heat exchanger washing industry domestically, current heat exchanger no matter be shell-and-tube type or plate heat exchanger need leave very big space dismantlement work of decontaminating more, because the work of cleaning scale is frequent, and the heat exchanger needs frequently to be dismantled and wash, damage easily and shorten life, not only need often to shut down the production, and the scene most collides with and bumps a slice wolf of sewage, and the expense is expensive, bring permanent burden for the enterprise.

Disclosure of Invention

The purpose of this application is to facilitate heat exchanger clearance.

In order to achieve the purpose, the following technical scheme is adopted in the application: a heat exchanger convenient to clean comprises a radiator framework, a plurality of baffle plates, a plurality of heat transfer pipes and two positioning plates, wherein the two positioning plates are fixed at two ends of the radiator framework and are connected to two ends of the plurality of heat transfer pipes in parallel;

a main surrounding plate and a sealing plate are arranged in the radiator framework, the main surrounding plate is fixed between the two positioning plates, the sealing plate is fixed on the main surrounding plate, a cleaning hole is formed in the main surrounding plate, and a sealing assembly is detachably connected to the main surrounding plate;

when cold and heat exchange is carried out, heat flow flows in the heat transfer pipe, and cold flow flows among the baffle plates;

when a plurality of baffle plates are cleaned, the sealing assembly is disassembled, cleaning liquid is sprayed into the main coaming through the cleaning holes, and the cleaning liquid is sprayed to the heat transfer pipe when the heat transfer pipe is cleaned.

Preferably, the sealing assembly comprises a spout pressing plate and a spout sealing gasket, the spout sealing gasket is tightly abutted to the cleaning hole on the main enclosing plate, and the spout pressing plate presses the spout sealing gasket to be fixed on the main enclosing plate.

Preferably, both ends of the sealing plate are respectively provided with a cold flow outlet and a cold flow inlet, and the cross sections of the cold flow outlet and the cold flow inlet are gradually reduced from top to bottom.

Preferably, a pipe box A is mounted on one positioning plate, and a heat flow inlet is formed in the pipe box A;

and a pipe box B is arranged on the other positioning plate, and a heat flow outlet is formed in the pipe box B.

Preferably, the heat flow inlet is positioned on the side surface of the channel A, so that the heat flow direction is vertical to the heat transfer pipe; the heat flow outlet is positioned on the front surface of the tube box B, so that the heat flow direction is parallel to the heat transfer tube.

Preferably, the tube box A is detachably connected with a cleaning door cover.

Preferably, a second sewage draining outlet is formed in the sealing plate, a sewage draining outlet sealing gasket is tightly abutted to the second sewage draining outlet on the sealing plate, and a sewage draining outlet pressing plate is tightly pressed on the sewage draining outlet sealing gasket;

the pipe box B is provided with a first drain outlet.

Preferably, the periphery of the radiator framework is provided with a heat insulation plate for heat insulation.

Preferably, the radiator framework is fixedly connected with long reinforcing ribs and short reinforcing ribs, the long reinforcing ribs are fixed on the length direction of the radiator framework, and the short reinforcing ribs are fixed on the width direction of the radiator framework.

Preferably, a plurality of the baffles are all inclined downwards.

Has the advantages that: 1. the heat transfer pipe has rectangular pipes arranged orderly for use as pipe-shell heat exchanger, rather than circular pipes, and has ordered arrangement of pipes, uniform gaps between pipe shell and arranged pipes, and high pressure water jet spray gun for cleaning. Need not to dismantle and can clear up the shell side dirt comprehensively, and the tube side dirt can be blown the clearance to the effective high-pressure water jet of rectangle one by one, the tube side that passes through of general hot-fluid and easy scale deposit in addition, and microthermal clean fluid of difficult scale deposit passes through the shell side, increase heat exchange coefficient through setting up reasonable baffling board in addition, improve the heat exchange rate, can be close to having reached plate heat exchanger compact structure nature, the advantage that heat transfer efficiency is high, shell and tube heat exchanger's sturdy structure simultaneously, the withstand voltage reliability of temperature resistant, especially, it need not to dismantle the heat exchanger to clear up the dirt.

2. Short downtime, clean environment of the whole machine on the cleaning site, low cost and the like. In the process of industrial production, the scaling and blockage of individual equipment or local pipeline lines can be caused by emergencies caused by improper operation sometimes, and the normal operation of production is influenced. For the situation, the dirt is removed rapidly, the normal operation of the production device is ensured, and the normal production state is recovered.

3. And recovering the production efficiency of the device. For example, the heat coefficient of heat transferred by equipment such as a heat exchanger and the like is reduced due to the scaling of chemical equipment, the circulation area of a pipeline is reduced or the circulation resistance is increased, the consumption of energy, materials and the like is increased, and the production efficiency is obviously reduced. At this time, the production efficiency of the production equipment can be conveniently recovered by cleaning and descaling.

4. The high-pressure water jet cleaning heat exchanger belongs to a physical cleaning method, and has a plurality of advantages compared with the traditional manual cleaning, mechanical cleaning and chemical cleaning: the cleaning cost is low, the cleaning quality is good, the cleaning speed is high, no environmental pollution is generated, and no corrosion is caused to equipment.

5. The cross-section of heat-transfer pipe is the rectangle, is convenient for wash the outside of heat-transfer pipe on the one hand, and on the other hand compares in the cross-section for circular heat-transfer pipe, because the surface area of rectangle is great, and during the heat transfer, heat transfer area is great, so heat exchange efficiency is better.

6. Because the heat-transfer pipe is the rectangle pipe, in the volume in same space, the arrangement of rectangle pipe is compacter, and the rectangle pipe can arrange more quantity promptly, so this application adopts the rectangle heat-transfer pipe to have better heat transfer efficiency.

7. The device can be widely applied to liquid-liquid heat exchange and gas-liquid heat exchange, and can also be applied to gas-gas heat exchange, particularly has incomparable advantages in the industries of scale formation corrosion, crystallization and impurity-containing material waste heat recovery in various industries, and has the advantages that the dirt and dust in the pipe pass linear rectangular hole are not easy to accumulate and are convenient to spray and clean by using a high-pressure water gun, and the standardized pressing plate and the standardized sealing strip are only required to be detached, and a high-pressure air gun or a high-pressure water gun is matched with a detergent to spray and clean, so that the cooling pipe is not easy to damage, the appearance of the cooling pipe is clean, the heat exchange performance is stable, the service life is long, and the like.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

fig. 1 is a first schematic diagram illustrating an explosion according to a first embodiment of the present application.

Fig. 2 is a second schematic exploded view of the first embodiment of the present application.

Fig. 3 is a top view of the first embodiment of the present application.

Fig. 4 is a cross-sectional view taken along the plane a-a in fig. 3.

Fig. 5 is a side view of the first embodiment of the present application.

Fig. 6 is a cross-sectional view taken along the plane B-B in fig. 5.

Fig. 7 is an exploded view of a body structure according to an embodiment of the present disclosure.

Fig. 8 is an exploded view of a seal assembly for cleaning an aperture in accordance with one embodiment of the present application.

Fig. 9 is an exploded view of the sealing assembly at the waste outlet according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram illustrating an energy exchange state between a cold flow and a hot flow in an embodiment of the present application.

Fig. 11 is a schematic structural diagram of a cleaning state in the first embodiment of the present application.

Fig. 12 is a schematic structural diagram of a second embodiment of the present application.

Fig. 13 is an exploded view of the second embodiment of the present application.

Fig. 14 is a top view of the second embodiment of the present application.

Fig. 15 is a cross-sectional view taken along plane C-C of fig. 14.

Fig. 16 is an enlarged view of a portion E in fig. 15.

Fig. 17 is an enlarged view of portion F in fig. 15.

In the figure: 1. a cold flow outlet; 2. a heat flow inlet; 3. cleaning the door cover; 4. a pipe box A; 5. a thermal insulation board; 6.

a radiator skeleton; 7. a pipe box B; 8. a hot fluid outlet; 9. a first drain port; 10. a cold flow inlet; 11. a sewage draining interface; 12. a heat exchanger support; 13. a channel sealing gasket; 14. a nozzle pressing plate; 15. a spout seal gasket; 16. a drain outlet sealing gasket; 17. a drain outlet sealing ring; 18. a heat exchanger end face flange; 19. a spout sealing ring; 20. a pressure plate fixing seat; 21. a long reinforcing rib; 22. short reinforcing ribs; 23. a baffle plate; 24. a heat transfer tube; 25. a drain outlet pressing plate; 26. a pressure plate fixing seat; 27. positioning a plate; 28. a main coaming; 280. cleaning the holes; 29. closing the plate; 290. a second sewage draining outlet; 31. a first switching port; 32. a second switching port.

Detailed Description

The present application is described in further detail below with reference to figures 1-17.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

The first embodiment is as follows: the embodiment of the application discloses a heat exchanger convenient to clean, which comprises a radiator framework 6, a plurality of baffle plates 23, a plurality of rectangular heat transfer pipes 24 and two positioning plates 27; the radiator framework 6 is a rectangular frame, the baffle plates 23 are rectangular and equal in size, the two positioning plates 27 are rectangular and equal in size, the surface area of each baffle plate 23 is smaller than that of each positioning plate 27, and through holes for the heat transfer pipes 24 to pass through are formed in the baffle plates 23 and the positioning plates 27; the two positioning plates 27 are fixed at two ends of the radiator framework 6 by welding, two ends of the plurality of heat transfer pipes 24 are respectively welded on the two positioning plates 27, and the plurality of heat transfer pipes 24 are uniformly distributed on the positioning plates 27 in order to arrange more heat transfer pipes 24 in a limited space; the plurality of heat transfer pipes 24 are parallel to each other and pass through the plurality of baffle plates 23, the plurality of baffle plates 23 are parallel to each other, and the plurality of baffle plates 23 are alternately flush with one end face of the positioning plate 27; in order to enable the radiator framework 6 to be higher than the ground for a certain distance, the bottom of the radiator framework 6 is fixedly connected with a heat exchanger support 12 through welding, and the heat exchanger support 12 is a rectangular frame.

A main surrounding plate 28 and a sealing plate 29 are arranged in the radiator framework 6, the main surrounding plate 28 is fixed between the two positioning plates 27 through welding, the sealing plate 29 is fixed on the main surrounding plate 28 through welding, the top of the main surrounding plate 28 is provided with a cleaning hole 280, the cleaning hole 280 is positioned right above the baffle plate 23, and the main surrounding plate 28 is detachably connected with a sealing assembly; when heat and cold exchange is performed, hot fluid flows through the heat transfer pipe 24, and cold fluid flows among the plurality of baffle plates 23, so that heat and cold exchange is realized; when the plurality of baffle plates 23 are cleaned, the seal assembly is removed, and a cleaning liquid is injected into the inside of the dash panel 28 through the cleaning hole 280, and when the heat transfer pipe 24 is cleaned, a cleaning liquid is injected into the heat transfer pipe 24.

The section of the heat transfer pipe 24 is rectangular, and the data of the teaching materials of the heat transfer science of the higher school is referred according to the Nu of the Nu; the physical meaning is a criterion number representing the intensity of convective heat transfer, and also represents the ratio NU (highest) of the heat conduction resistance and convective heat transfer resistance of the fluid layer;

dc is the geometrical characteristic length of the heat transfer surface, the size of the direction vertical to the heat transfer surface, and the unit m is the diameter of the heat transfer pipe, the thickness of the heat transfer layer and the like.

h is the surface convection coefficient of the fluid, and the unit is W/(m2. k);

λ is the thermal conductivity of the stationary fluid, in units of W/(m.k);

through the anger Sell number, the fact that the b/a of the rectangular pipe is larger than 3 can be found, and the anger Sell number can be larger than that of the round pipe. Therefore, the heat transfer pipe with b/a larger than 3 is selected, and the heat exchange rate is certainly larger than that of the round pipe.

And because the heat exchange area of the square tube is higher than that of the round tube under the same volume condition, the hydraulic diameter of the square tube type heat exchanger can be smaller than 6 mm.

In order to avoid high temperature differential stress when a large temperature differential between the two fluids is used, a compensating ring (expansion joint) is usually added at the shell side position, and when the shell and the tube bundle have different thermal expansions, the compensating ring undergoes slow elastic deformation to compensate the thermal expansion caused by the temperature differential stress.

The rectangular pipe and the long waist-shaped pipe with the b/a larger than 3 adopted in the application also belong to the protection range.

The rectangular tube type heat exchanger is divided into a vertical type or a horizontal type, only shell side dirt cleaning is considered, a main baffle plate of the vertical type heat exchanger is provided with an inclination, and finally cleaning and scouring dirt outflow are facilitated. The horizontal heat exchanger main body baffle plate has no inclination, and a sewage discharge port is directly formed in the bottom of the middle of the two baffle plates, so that the horizontal heat exchanger main body baffle plate is convenient to clean one by one.

The device can absorb the advantages of the plate type heat exchanger and the shell-and-tube type heat exchanger, not only achieves the purpose of compactness and high heat exchange efficiency, but also is simple and convenient to clean dirt, and can play a guiding role in energy conservation, emission reduction and upgrading of the industry of the Chinese heat exchanger in future.

When the heat transfer pipe 24 is rectangular, when dirt on the outer pipe wall of the heat transfer pipe 24 is cleaned, the dirt on the outer pipe wall of the heat transfer pipe 24, particularly the dirt close to the outer ring, can be comprehensively and effectively cleaned, and the long-term working stability is improved.

The thickness of the heat transfer pipe 24 is 0.4 to 0.8 mm, and therefore the weight of the present application can be reduced.

The sealing assembly comprises a spout pressing plate 14, a spout sealing gasket 15, a spout sealing ring 19 and six pressing plate fixing seats 20, wherein the six pressing plate fixing seats 20 are fixed on the periphery of the spout sealing ring 19 through welding respectively, the spout sealing ring 19 is fixed on a main enclosing plate 28 through welding at a cleaning hole 280, the spout pressing plate 14 is fixed on the spout sealing ring 19 through bolts, and the spout sealing gasket 15 is clamped between the spout pressing plate 14 and the spout sealing ring 19.

The closing plate 29 is provided with a second sewage outlet 290; a drain outlet pressing plate 25 is welded at the second drain outlet 290 on the sealing plate 29, and a pressing plate fixing seat 26 is fixedly connected to the drain outlet pressing plate 25 through welding; the surface of the drain pressing plate 25 is tightly abutted to be provided with a drain sealing gasket 16, the surface of the drain sealing gasket 16 is tightly abutted to be provided with a drain sealing ring 17, and a drain interface 11 is arranged on the drain sealing ring 17.

The two ends of the sealing plate 29 are respectively provided with a cold flow outlet 1 and a cold flow inlet 10, and the cross sections of the cold flow outlet 1 and the cold flow inlet 10 are gradually reduced from top to bottom.

A pipe box A4 is fixedly connected to one positioning plate 27 through bolts, a pipe box sealing gasket 13 for sealing is arranged between the positioning plate 27 and the pipe box A4, and a heat flow inlet 2 is formed in the pipe box A4; the other positioning plate 27 is fixedly connected with a tube box B7 through bolts, the tube box sealing gasket 13 is also fastened between the other positioning plate 27 and the tube box B7, and the tube box B7 is provided with a heat flow outlet 8.

The first drain port 9 is provided in the pipe box B7.

In order to facilitate the fixing firmness of the tube box A4 and the tube box B7, the heat exchanger end face flanges 18 are welded at the two ends of the radiator framework 6, and meanwhile, the tube box A4 and the tube box B7 are convenient to detach.

In order to facilitate cleaning, the cleaning door cover 3 is fixedly connected to the channel A4 through bolts; when cleaning the heat transfer pipe 24, the cleaning door 3 is removed and water is flushed to the heat transfer pipe 24.

In order for the heat to be sufficiently in contact with the cold flow, the hot flow inlet 2 is located on the side of the header a4 so that the hot flow direction is perpendicular to the heat transfer tubes 24; the hot outlet 8 is located on the front side of the header B7 such that the hot flow direction is parallel to the heat transfer tubes 24.

In order to reduce the heat loss, the periphery of the radiator framework 6 is provided with a heat insulation plate 5 with the heat insulation function.

In order to improve the structural strength of the radiator, the radiator frame 6 is fixedly connected with long reinforcing ribs 21 and short reinforcing ribs 22 by welding, the long reinforcing ribs 21 are fixedly welded in the length direction of the radiator frame 6, and the short reinforcing ribs 22 are fixedly welded in the width direction of the radiator frame 6.

The heat exchanger shell is rectangular, in order to keep the minimum uniform distance with the rectangular heat transfer tubes 24 uniformly and regularly arranged inside to be beneficial to sufficient heat exchange, the main enclosing plate 28 and the closing plate 29 can be enclosed into a proper rectangular shell, the main enclosing plate adopts a groove-shaped structure, the welding strength deformation of the groove opening folded edge is small, and of course, three plates can be spliced as long as the rectangular shell structure is adopted. The final welding of the fixing ring and the fixing seat on the main enclosing plate 28 and the closing plate 29 ensures reliable sealing. While increasing the rigidity and pressure resistance of the rectangular housing.

Example two: the embodiment of the application discloses a heat exchanger convenient to clean, which comprises a radiator framework 6, a plurality of baffle plates 23, a plurality of heat transfer pipes 24 and two positioning plates 27; the radiator framework 6 is a rectangular frame, the baffle plates 23 are rectangular and equal in size, the two positioning plates 27 are rectangular and equal in size, the surface area of each baffle plate 23 is smaller than that of each positioning plate 27, and through holes for the heat transfer pipes 24 to pass through are formed in the baffle plates 23 and the positioning plates 27; the two positioning plates 27 are fixed at two ends of the radiator framework 6 by welding, two ends of the plurality of heat transfer pipes 24 are respectively welded on the two positioning plates 27, the plurality of heat transfer pipes 24 are parallel to each other and penetrate through the plurality of baffle plates 23, the baffle plates 23 form an acute angle with a vertical surface downwards, and the plurality of baffle plates 23 are alternatively flush with one end surface of the positioning plates 27.

A main surrounding plate 28 and a sealing plate 29 are arranged in the radiator framework 6, the main surrounding plate 28 is fixed between the two positioning plates 27 through welding, the sealing plate 29 is fixed on the main surrounding plate 28 through welding, a cleaning hole 280 is formed in the top of the main surrounding plate 28, and a sealing assembly is detachably connected to the main surrounding plate 28; when heat and cold exchange is performed, a hot flow flows through the heat transfer pipe 24, and a cold flow flows among the plurality of baffles 23; when the plurality of baffle plates 23 are cleaned, the seal assembly is removed, and a cleaning liquid is injected into the inside of the dash panel 28 through the cleaning hole 280, and when the heat transfer pipe 24 is cleaned, a cleaning liquid is injected into the heat transfer pipe 24.

First exchange ports 31 are installed at both ends of the positioning plate 27, and second exchange ports 32 are installed near both ends of the closing plate 29.

In order to facilitate the fixing firmness of the first exchanging port 3, the heat exchanger end face flanges 18 are welded at the two ends of the radiator framework 6, and meanwhile, the pipe box A4 and the pipe box B7 are convenient to detach.

When the radiator is in a vertical state, the plurality of baffles 23 are all inclined downward.

Finally, it should be noted that: the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The heat exchanger convenient to clean is characterized by comprising a radiator framework (6), a plurality of baffle plates (23), a plurality of heat transfer pipes (24) with rectangular sections and two positioning plates (27), wherein the two positioning plates (27) are fixed at two ends of the radiator framework (6), the plurality of heat transfer pipes (24) penetrate through the plurality of baffle plates (23) in parallel, and the plurality of baffle plates (23) are alternatively flush with one end face of the positioning plate (27);

a main surrounding plate (28) and a sealing plate (29) are arranged in the radiator framework (6), the main surrounding plate (28) is fixed between the two positioning plates (27), the sealing plate (29) is fixed on the main surrounding plate (28), a cleaning hole (280) is formed in the main surrounding plate (28), and a sealing assembly is detachably connected to the main surrounding plate (28);

when heat and cold exchange is performed, hot fluid flows through the heat transfer pipe (24), and cold fluid flows among the plurality of baffle plates (23);

when the inner wall of the main coaming (28) on the outer wall of the heat transfer pipe (24) and the plurality of baffle plates (23) are cleaned, the sealing assembly is disassembled, cleaning liquid is sprayed into the main coaming (28) through the cleaning hole (280), and when the inner wall of the heat transfer pipe (24) is cleaned, the cleaning liquid is sprayed into the inner wall of the heat transfer pipe (24).

2. The heat exchanger of claim 1, wherein: the sealing assembly comprises a nozzle pressing plate (14) and a nozzle sealing gasket (15), the nozzle sealing gasket (15) is tightly abutted to a cleaning hole (280) on the main enclosing plate (28), and the nozzle pressing plate (14) presses the nozzle sealing gasket (15) to be fixed on the main enclosing plate (28).

3. The heat exchanger of claim 1, wherein: and the two ends of the sealing plate (29) are respectively provided with a cold flow outlet (1) and a cold flow inlet (10), and the cross sections of the cold flow outlet (1) and the cold flow inlet (10) are gradually reduced from top to bottom.

4. The heat exchanger of claim 3, wherein: a pipe box A (4) is mounted on one positioning plate (27), and a heat flow inlet (2) is formed in the pipe box A (4);

and a pipe box B (7) is arranged on the other positioning plate (27), and a heat flow outlet (8) is formed in the pipe box B (7).

5. The heat exchanger facilitating cleaning according to claim 4, wherein: the heat flow inlet (2) is positioned on the side surface of the channel A (4) so that the heat flow direction is vertical to the heat transfer pipe (24); the heat flow outlet (8) is positioned on the front surface of the tube box B (7) so that the heat flow direction is parallel to the heat transfer tube (24).

6. The heat exchanger facilitating cleaning according to claim 5, wherein: the tube box A (4) is detachably connected with a cleaning door cover (3).

7. The heat exchanger of claim 6, wherein: a second sewage draining outlet (290) is formed in the sealing plate (29), a sewage draining outlet sealing gasket (16) is tightly pressed out of the second sewage draining outlet (290) in the sealing plate (29), and a sewage draining outlet pressing plate (25) is tightly pressed on the sewage draining outlet sealing gasket (16);

the pipe box B (7) is provided with a first drain outlet (9).

8. The heat exchanger of claim 1, wherein: first exchange ports (31) are installed at two ends of the positioning plate (27), and second exchange ports (32) are installed near two ends of the sealing plate (29).

9. The heat exchanger of claim 1, wherein: radiator skeleton (6) are gone up fixedly connected with long strengthening rib (21) and short strengthening rib (22), on the length direction of the fixed radiator skeleton (6) of long strengthening rib (21), the width direction at radiator skeleton (6) is fixed in short strengthening rib (22).

10. The heat exchanger of claim 1, wherein: the baffles (23) are all inclined downwards.