CN210399513U

CN210399513U - Inverted combustion heat exchanger

Info

Publication number: CN210399513U
Application number: CN201920620858.6U
Authority: CN
Inventors: 赵程鹏
Original assignee: ZHEJIANG GUANGTAO SANITATION KITCHEN CO Ltd
Current assignee: ZHEJIANG GUANGTAO SANITATION KITCHEN CO Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-04-24
Anticipated expiration: 2029-04-30

Abstract

The utility model provides an invert burning heat exchanger belongs to heat exchange technical field. The inverted burner solves the problems that the existing inverted burner is easy to accumulate ash and needs to be maintained regularly. The heat exchange device comprises a first box body, a first heat exchange tube is arranged on the lower portion of the first box body in a penetrating mode, a second heat exchange tube is arranged on the upper portion of the first box body in a penetrating mode, a plurality of heat exchange fins are sleeved on the second heat exchange tube, one side of the first box body is penetrated out by the first heat exchange tube and one end of the second heat exchange tube, the other side of the first box body is penetrated out by the first heat exchange tube and the other end of the second heat exchange tube, a first series assembly used for serially connecting the first heat exchange tube and a second series assembly used for serially connecting the second heat exchange tube are arranged on the first box body, the second box body is arranged on the upper portion of the first box body, a combustion. The utility model can effectively prevent backfire and does not need regular maintenance.

Description

Inverted combustion heat exchanger

Technical Field

The utility model belongs to the technical field of the heat exchange, a heat exchanger, especially an invert burning heat exchanger is related to.

Background

Condensing gas heater is because of heat exchange efficiency is high and the extensive application, and current condensing gas heater is flame upward burning generally, adopts from advancing the exhaust mode of gas from last row of flue gas down, and the gas heater of this kind of exhaust mode generally can set up the heat exchanger on top or side, but to condensing gas heater, this kind of setting can have a great deal of drawbacks for a long time using: the condensate water that the heat exchanger produced drops to and causes the corruption to the combustor on the combustor, not only reduces combustion efficiency, still influences the life of combustor, is unfavorable for the emission of comdenstion water simultaneously.

Therefore, the Chinese patent discloses an inverted full-premixing condensing gas water heater (with the publication number of CN 103090541B), which adopts an inverted metal fiber burner, wherein a main controller controls the reasonable proportioning of a gas valve assembly and a fan, mixed gas enters a gas mixing device, is uniformly mixed by the gas mixing device and then enters a burner assembly, the combustion is carried out on the surface of the metal fiber of the burner, high-temperature flue gas after combustion firstly passes through a primary heat exchanger and then passes through a secondary heat exchanger for heat exchange, the temperature of the flue gas is reduced to be lower than the dew point temperature, water vapor in the flue gas is condensed to generate condensed water, the condensed water is collected by a condensed water collector, and is discharged from a condensed water outlet hole at the bottom of the condensed water collector and a condensed water leading-out pipe flowing liquid package, and the flue gas is discharged by; the secondary heat exchanger preheats cold water, and the preheated warm water enters the primary heat exchanger to continuously absorb heat to form hot water for use.

However, the above-mentioned inverted fully premixed condensing gas water heater is not provided with a structure for preventing backfire, and when the mixed gas is combusted on the surface of the inverted metal fiber burner, the flue gas will flow upwards, and dust is deposited on the upper surface of the burner, which requires regular maintenance.

Disclosure of Invention

The present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an inverted combustion heat exchanger capable of preventing backfire.

The purpose of the invention can be realized by the following technical scheme:

the inverted combustion heat exchanger comprises a first box body with a flue gas channel inside, a plurality of transversely extending heat exchange tubes I are arranged on the lower portion of the first box body in a penetrating manner, a plurality of transversely extending heat exchange tubes II are arranged on the upper portion of the first box body in a penetrating manner, a plurality of heat exchange fins positioned in the flue gas channel are sleeved on the heat exchange tubes II, one ends of the heat exchange tubes I and the heat exchange tubes II penetrate through one side of the first box body, the other ends of the heat exchange tubes I and the heat exchange tubes II penetrate through the other side of the first box body, a first series assembly used for serially connecting the heat exchange tubes I and a second series assembly used for serially connecting the heat exchange tubes II are arranged on the first box body, the inverted combustion heat exchanger is characterized in that a second box body is arranged on the upper portion of the first box body, a flow passing channel is arranged in the second box body, a combustion plate used, and an anti-backfire structure is arranged above the combustion plate.

In foretell inversion combustion heat exchanger, the anti-backfire structure including locating the guide plate that is used for the shutoff to overflow the passageway of combustion plate top, guide plate and combustion plate between be formed with the cavity, overflow the upper end and the cavity intercommunication of aperture, the guide plate on be equipped with a plurality of water conservancy diversion holes that are used for the intercommunication to overflow passageway and cavity, the lower part of guide plate still is equipped with a plurality of baffling pieces that set up with water conservancy diversion hole one-to-one, the baffling piece keep away from the one end slope downwardly extending of guide plate to the cavity in, the water conservancy diversion hole be located the top of the water conservancy diversion piece that sets up with it correspondingly.

In the above inverted combustion heat exchanger, the flow guide holes are rectangular, the upper ends of the flow blocking pieces are fixedly connected with one sides of the flow guide holes, and the width of the flow blocking pieces is equal to that of the flow guide holes correspondingly arranged. The guide holes are uniformly distributed on the guide plate, and the guide pieces are positioned on the same side of the guide holes.

In the inverted combustion heat exchanger, the lower part of the second box body is inwardly folded to form a first annular rib matched with the guide plate, the guide plate abuts against the first annular rib, an inner ring of the first annular rib is provided with a downwardly extending annular connecting part, the lower part of the annular connecting part is inwardly folded to form a second annular rib matched with the combustion plate, and the combustion plate abuts against the second annular rib. Wherein, the middle part of the combustion plate is recessed downwards, and the middle part of the guide plate is recessed downwards. The upper part of the second box body is provided with an air inlet connector, high-pressure coal gas/fuel gas and air are injected into the overflowing channel through the air inlet connector, the high-pressure coal gas/fuel gas and the air sequentially pass through the flow guide holes, the cavity and the overflowing small holes and then are combusted on the lower surface of the combustion plate, part of flame smoke generated during combustion enters the cavity between the flow guide plate and the combustion plate through the overflowing small holes, and the flame smoke is prevented from continuously flowing upwards under the action of the anti-backfire structure, so that backfire is. Because the high-pressure gas is introduced into the gas inlet joint, the gas can move downwards after entering the overflowing channel, and the smoke formed after the gas is combusted moves downwards to exchange heat with the heat exchange fins, the heat exchange tubes II and the heat exchange tubes I.

In the inverted combustion heat exchanger, the first series component comprises a plurality of first communicating bodies arranged on one side of the first box body and a plurality of second communicating bodies arranged on the other side of the first box body, one end of the first heat exchange tube is communicated with the first communicating bodies correspondingly arranged, the other end of the first heat exchange tube is communicated with the second communicating bodies correspondingly arranged, and the first communicating bodies and the second communicating bodies are sequentially connected in series through the first heat exchange tube; the second series component comprises a plurality of third communicating bodies arranged on one side of the first box body and a plurality of fourth communicating bodies arranged on the other side of the first box body, one end of the second heat exchange tube is communicated with the third communicating bodies correspondingly arranged with the second heat exchange tube, the other end of the second heat exchange tube is communicated with the fourth communicating bodies correspondingly arranged with the second heat exchange tube, and the third communicating bodies and the fourth communicating bodies pass through the second heat exchange tube to be sequentially connected in series.

One end of each first heat exchange tube is provided with a first communicating body which corresponds to the first heat exchange tube, the other end of each first heat exchange tube is provided with a second communicating body which corresponds to the second heat exchange tube, one end of each second heat exchange tube is provided with a third communicating body which corresponds to the third communicating body, and the other end of each second heat exchange tube is provided with a fourth communicating body which corresponds to the fourth communicating body. In order to realize the series connection of the first series assembly and the second series assembly, a first connector is arranged at the inlet end of the first series assembly, the outlet end of the first series assembly is communicated with the inlet end of the second series assembly, and a second connector is arranged at the outlet end of the second series assembly. Specifically, the first connector is arranged on the first communicating body/the second communicating body which is positioned at the inlet end, the second connector is arranged on the third communicating body/the fourth communicating body which is positioned at the outlet end, and the first communicating body/the second communicating body which is positioned at the outlet end is communicated with the third communicating body/the fourth communicating body which is positioned at the inlet end through the connecting pipe.

In the above inverted combustion heat exchanger, the first communicating body includes a casing with an opening on one side, a cover is arranged at the opening of the casing, a communicating cavity is formed between the casing and the cover, the outer side wall of the cover abuts against the inner side wall of the opening of the casing, the cover is fixedly connected with the casing, a plurality of connecting holes communicated with the communicating cavity are formed in the cover, and one end of the first heat exchange tube extends into the connecting hole correspondingly formed in the first heat exchange tube.

Specifically, the cover body is positioned at the opening of the shell and fixedly connected with the shell, a communicating cavity is formed between the cover body and the shell, and the first heat exchange tube extends into the connecting hole and is communicated with the communicating cavity. The shape of the connecting hole is the same as the shape of the cross section of the first heat exchange tube, and the cover body is sleeved on the first heat exchange tube and then covered on the shell body during installation and fixedly connected through welding. The structure of the second communicating body, the third communicating body and the fourth communicating body is basically the same as that of the first communicating body, and the second communicating body, the third communicating body and the fourth communicating body also comprise a shell, a cover body and a communicating cavity, wherein the cover body is also provided with a connecting hole, and only the shape and the size of the connecting hole are different. The box body I is provided with a plurality of penetrating holes which are matched with the heat exchange tube I and the heat exchange tube II, the heat exchange tube I and the heat exchange tube II penetrate through the penetrating holes which are correspondingly arranged, and the heat exchange tube I and the heat exchange tube II are matched with the penetrating holes in a sealing mode.

In the inverted combustion heat exchanger, at least a plurality of the heat exchange tubes are arranged in two transverse rows, the heat exchange tubes in the same transverse row are uniformly distributed, and the heat exchange tubes in one transverse row and the heat exchange tubes in the adjacent transverse row are arranged in a staggered manner. For example, the heat exchange tubes may be arranged in two or three rows. When the heat exchange tubes are arranged into two transverse rows, the first heat exchange tubes in the first transverse row and the first heat exchange tubes in the second transverse row are arranged in a staggered mode. When the heat exchange tubes are arranged into three transverse rows, the first heat exchange tubes in the first transverse row and the first heat exchange tubes in the second transverse row are arranged in a staggered mode, the first heat exchange tubes in the second transverse row and the first heat exchange tubes in the third transverse row are arranged in a staggered mode, and the first heat exchange tubes in the first transverse row and the first heat exchange tubes in the third transverse row are arranged in an aligned mode.

The first heat exchange tube can be a round tube or a flat tube. When the first heat exchange tube is a flat tube, the transverse width of the first heat exchange tube is smaller, and the longitudinal width of the first heat exchange tube is larger.

In the above inverted combustion heat exchanger, the heat exchanger fin comprises a flaky body, the body is provided with a plurality of rows of uniformly arranged mounting holes, the second heat exchange tube is arranged in the mounting hole correspondingly in a penetrating manner, and the periphery of the mounting hole is provided with an annular blocking edge surrounding the second heat exchange tube. The annular blocking edge is arranged, so that the stability of the second heat exchange tube can be improved, and the contact area between the second heat exchange tube and the annular blocking edge is increased, so that the heat exchange effect is improved.

In the inverted combustion heat exchanger, one end of the body is provided with a first flanging, the other end of the body is provided with a second flanging which is arranged opposite to the first flanging, the lower end of the first flanging is provided with a third flanging which is obliquely arranged towards one side of the body, and the lower end of the second flanging is provided with a fourth flanging which is arranged opposite to the third flanging. The first flanging and the second flanging can increase the contact area with the flue gas, and simultaneously reduce the gap between the two adjacent bodies, so that the flue gas entering between the two adjacent bodies is not easy to escape, thereby improving the heat exchange efficiency, and meanwhile, the third flanging and the fourth flanging are arranged, and the heat exchange rate is also improved.

The lower part of every row of mounting hole all is equipped with one row of reposition of redundant personnel, and single reposition of redundant personnel is located between two adjacent mounting holes of its top, and the reposition of redundant personnel is cylindricly and link up the body setting, in order to realize better reposition of redundant personnel effect, increases the route of flue gas, and the external diameter of reposition of redundant personnel should be greater than the minimum distance between two mounting holes that correspond the setting with it, and the diameter that is located the reposition of redundant personnel of last row simultaneously is greater than the diameter that is located the next row of reposition of redundant personnel.

Compared with the prior art, the inverted combustion heat exchanger has the following advantages:

the first box body for heat exchange is arranged at the lower part of the second box body for combustion, and condensed water generated by the first heat exchange tube, the second heat exchange tube and the heat exchange fins cannot drop onto the combustion plate, so that the combustion effect is improved, and meanwhile, the service life is prolonged; each communicating body and the first box body are of a split structure, so that the installation is facilitated, and the cost is reduced; set up the guide plate above the burner plate, set up on the guide plate and keep off the flow sheet, can prevent effectively that the flame flue gas from getting into and overflowing in the passageway, the anti-return is effectual, and burner plate and guide plate all adopt the stainless steel to make, have effectively prolonged life.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a second box provided in the first embodiment.

Fig. 4 is another schematic structural diagram of the second box provided in the first embodiment.

Fig. 5 is a top view of the second box according to the first embodiment.

Fig. 6 is a cross-sectional view taken at a-a in fig. 5.

Fig. 7 is a sectional view taken at B-B in fig. 5.

Fig. 8 is a schematic structural diagram of a first box provided in the first embodiment.

Fig. 9 is a partial structural schematic diagram of a first box provided in the first embodiment.

Fig. 10 is a schematic structural diagram of the cover body according to the present invention.

Fig. 11 is a schematic structural diagram of a heat exchanger fin provided by the present invention.

In the figure, 1, a first box body; 2. a first heat exchange tube; 3. a second heat exchange tube; 4. a heat exchanger fin; 5. A second box body; 6. a combustion plate; 7. an overflow aperture; 8. a baffle; 9. a flow guide hole; 10. A flow blocking sheet; 11. a first annular flange; 12. a second annular flange; 13. a first communicating body; 14. a second communicating body; 15. a third connecting body; 16. a communicating body IV; 17. a cover body; 18. connecting holes; 19. mounting holes; 20. an annular blocking edge; 21. flanging one; 22. flanging two; 23. Flanging three; 24. flanging four; 25. a first connector; 26. a second joint; 27. taking over a pipe; 28. A connecting cylinder; 29. an air inlet joint; 30. a flow-splitting body.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

The inverted combustion heat exchanger shown in figure 1 comprises a first box body 1 with a flue gas channel inside, wherein the first box body 1 is cylindrical, a plurality of transversely extending heat exchange tubes 2 are arranged on the lower portion of the first box body in a penetrating mode, the heat exchange tubes 2 are arranged in three transverse rows, the heat exchange tubes 2 in the same transverse row are uniformly distributed, the heat exchange tubes 2 in one transverse row and the heat exchange tubes 2 in the adjacent transverse row are arranged in a staggered mode, namely the heat exchange tubes 2 in the first transverse row and the heat exchange tubes 2 in the second transverse row are arranged in a staggered mode, the heat exchange tubes 2 in the second transverse row and the heat exchange tubes 2 in the third transverse row are arranged in a staggered mode, and the heat exchange tubes 2 in the first transverse row and the heat exchange tubes 2 in the third transverse row are arranged in an aligned mode.

As shown in fig. 1 and 9, the heat exchange tube one 2 is a circular tube.

A plurality of transversely extending heat exchange tubes 3 are arranged on the upper part of the box body I1 in a penetrating mode, and the heat exchange tubes 3 are parallel to the heat exchange tubes I2. The heat exchange tube II 3 is sleeved with a plurality of heat exchange fins 4 located in the flue gas channel, as shown in fig. 11, each heat exchange fin 4 comprises a flaky body, a plurality of rows of uniformly arranged mounting holes 19 are formed in the body, the heat exchange tube II 3 penetrates through the mounting holes 19 correspondingly arranged with the heat exchange tube II, and the periphery of each mounting hole 19 is provided with an annular blocking edge 20 surrounding the heat exchange tube II 3. The annular blocking edge 20 is arranged, so that the stability of the second heat exchange tube 3 can be improved, and the contact area with the second heat exchange tube 3 is increased, so that the heat exchange effect is improved.

As shown in fig. 11, one end of the body is provided with a first flange 21, the other end of the body is provided with a second flange 22 opposite to the first flange 21, the lower end of the first flange 21 is provided with a third flange 23 inclined towards one side of the body, and the lower end of the second flange 22 is provided with a fourth flange 24 opposite to the third flange 23. The first flanging 21 and the second flanging 22 can increase the contact area with the flue gas, and simultaneously reduce the gap between the two adjacent bodies, so that the flue gas entering between the two adjacent bodies is not easy to escape, thereby improving the heat exchange efficiency, and simultaneously, the third flanging 23 and the fourth flanging 24 are arranged, and the heat exchange rate is also improved.

As shown in fig. 11, a row of flow distribution bodies 30 is disposed at the lower portion of each row of mounting holes 19, a single flow distribution body 30 is located between two adjacent mounting holes 19 above the single flow distribution body, the flow distribution body 30 is cylindrical and penetrates through the body, in order to achieve a better flow distribution effect and increase the path of the flue gas, the outer diameter of the flow distribution body 30 should be greater than the minimum distance between two corresponding mounting holes 19, and meanwhile, the diameter of the flow distribution body 30 located in the previous row is greater than the diameter of the flow distribution body 30 located in the next row.

As shown in fig. 9, one end of the heat exchange tube i 2 and one end of the heat exchange tube ii 3 penetrate through one side of the box body i 1, the other end of the heat exchange tube i 2 and the other end of the heat exchange tube ii 3 penetrate through the other side of the box body i 1, and a first series assembly for serially connecting the heat exchange tube i 2 and a second series assembly for serially connecting the heat exchange tube ii 3 are arranged on the box body i 1. Specifically, as shown in fig. 8, the first series-connection component comprises a plurality of first communication bodies 13 arranged on one side of the first box body 1 and a plurality of second communication bodies 14 arranged on the other side of the first box body 1, one end of the first heat exchange tube 2 is communicated with the first communication bodies 13 arranged corresponding to the first heat exchange tube, the other end of the first heat exchange tube 2 is communicated with the second communication bodies 14 arranged corresponding to the first heat exchange tube, and the first communication bodies 13 and the second communication bodies 14 are sequentially connected in series through the first heat exchange tubes 2. The two series components comprise a plurality of communicating bodies three 15 arranged on one side of the box body 1 and a plurality of communicating bodies four 16 arranged on the other side of the box body 1, one end of the heat exchange tube two 3 is communicated with the communicating bodies three 15 correspondingly arranged with the heat exchange tube two, the other end of the heat exchange tube two 3 is communicated with the communicating bodies four 16 correspondingly arranged with the heat exchange tube two, and the communicating bodies three 15 and the communicating bodies four 16 are sequentially connected in series through the heat exchange tube two 3.

One end of each heat exchange tube I2 is provided with a communicating body I13 which corresponds to the communicating body I, the other end of each heat exchange tube I2 is provided with a communicating body II 14 which corresponds to the communicating body I, one end of each heat exchange tube II 3 is provided with a communicating body III 15 which corresponds to the communicating body III, and the other end of each heat exchange tube II 3 is provided with a communicating body IV 16 which corresponds to the communicating body IV.

In order to realize the series connection of the first series assembly and the second series assembly, a first connector 25 is arranged at the inlet end of the first series assembly, the outlet end of the first series assembly is communicated with the inlet end of the second series assembly, and a second connector 26 is arranged at the outlet end of the second series assembly. Specifically, as shown in fig. 8, the first connector 25 is disposed on the first communication body 13 at the inlet end, the second connector 26 is disposed on the third communication body 15 at the outlet end, and the first communication body 13 at the outlet end is communicated with the third communication body 15 at the inlet end through the connecting pipe 27.

The first communicating body 13 comprises a shell with an opening on one side, a cover body 17 is arranged at the opening of the shell, a communicating cavity is formed between the shell and the cover body 17, the outer side wall of the cover body 17 is attached to the inner side wall of the opening of the shell, the cover body 17 is fixedly connected with the shell, as shown in fig. 10, a plurality of connecting holes 18 communicated with the communicating cavity are formed in the cover body 17, and one end of the first heat exchange tube 2 extends into the connecting hole 18 correspondingly arranged with the first heat exchange tube. Specifically, the cover body 17 is positioned at the opening of the shell and fixedly connected with the shell, a communication cavity is formed between the cover body 17 and the shell, and the first heat exchange tube 2 extends into the connecting hole 18 and is communicated with the communication cavity. The shape of the connecting hole 18 is the same as the shape of the cross section of the heat exchange tube I2, and the cover body 17 is sleeved on the heat exchange tube I2 during installation, then the shell is covered on the heat exchange tube I, and the heat exchange tube I2 and the shell are fixedly connected through welding. The second communication body 14, the third communication body 15 and the fourth communication body 16 have substantially the same structure as the first communication body 13, and include a housing, a cover 17 and a communication chamber, and the cover 17 is similarly provided with a connection hole 18, which is different only in shape and size. The box body I1 is provided with a plurality of penetrating holes which are matched with the heat exchange tube I2 and the heat exchange tube II 3, the heat exchange tube I2 and the heat exchange tube II 3 penetrate through the penetrating holes which are correspondingly arranged, and the heat exchange tube I2 and the heat exchange tube II 3 are in sealing fit with the penetrating holes.

As shown in fig. 1, a second box 5 is arranged on the upper part of the first box 1, a flow passage is arranged in the second box 5, a connecting cylinder 28 in a cylindrical shape is arranged on the upper part of the first box 1 for facilitating the installation of the second box 5, and the second box 5 is inserted into the connecting cylinder 28 to realize butt joint. As shown in fig. 4, a combustion plate 6 for plugging the overflowing channel is arranged at the bottom of the second box body 5, a plurality of overflowing small holes 7 which are uniformly distributed are arranged on the combustion plate 6, the overflowing channel is communicated with the flue gas channel through the overflowing small holes 7, and an anti-backfire structure is arranged above the combustion plate 6.

As shown in fig. 3, fig. 5, fig. 6 and fig. 7, the anti-backfire structure comprises a guide plate 8 which is arranged above the combustion plate 6 and used for plugging the flow passage, a cavity is formed between the guide plate 8 and the combustion plate 6, the upper end of the flow passage small hole 7 is communicated with the cavity, a plurality of guide holes 9 which are used for communicating the flow passage and the cavity are arranged on the guide plate 8, a plurality of flow blocking pieces 10 which are arranged in one-to-one correspondence with the guide holes 9 are further arranged on the lower portion of the guide plate 8, one end of each flow blocking piece 10, which is far away from the guide plate 8, is inclined and downwardly extended into the cavity, and the.

Specifically, as shown in fig. 5, the flow guide hole 9 is rectangular, as shown in fig. 6, the upper end of the flow blocking piece 10 is fixedly connected with one side of the flow guide hole 9, and the width of the flow blocking piece 10 is equal to the width of the flow guide hole 9 correspondingly arranged thereto. The guide holes 9 are uniformly distributed on the guide plate 8, and all the guide plates are positioned on the same side of the guide holes 9.

As shown in fig. 6 and 7, the lower part of the second box body 5 is inwardly folded to form a first annular rib 11 which is matched with the guide plate 8, the guide plate 8 is attached to the first annular rib 11, an annular connecting part which extends downwards is arranged at the inner ring of the first annular rib 11, the lower part of the annular connecting part is inwardly folded to form a second annular rib 12 which is matched with the combustion plate 6, and the combustion plate 6 is attached to the second annular rib 12. Wherein, the middle part of the combustion plate 6 is concave downwards, and the middle part of the guide plate 8 is concave downwards. The upper part of the second box body 5 is provided with an air inlet connector 29, high-pressure coal gas/fuel gas and air are injected into the overflowing channel through the air inlet connector 29, and sequentially pass through the flow guide holes 9, the cavity and the overflowing small holes 7 to be combusted on the lower surface of the combustion plate 6, part of flame smoke generated during combustion enters the cavity between the flow guide plate 8 and the combustion plate 6 through the overflowing small holes 7, and the flame smoke is prevented from continuously flowing upwards under the action of the anti-backfire structure, so that backfire is prevented. Because the high-pressure gas is introduced into the gas inlet joint, the gas can move downwards after entering the overflowing channel, and the smoke formed after the gas is combusted moves downwards to exchange heat with the heat exchange fins 4, the heat exchange tubes II 3 and the heat exchange tubes I2.

Example two

The structural principle of this embodiment is basically the same as that of the first embodiment, and the difference is that, as shown in fig. 2, the heat exchange tubes one 2 are arranged in two transverse rows, the heat exchange tubes one 2 in the first transverse row and the heat exchange tubes one 2 in the second transverse row are arranged in a staggered manner, and the heat exchange tubes two 3 are flat tubes, the transverse width of which is small, and the longitudinal width of which is large.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. An inverted combustion heat exchanger comprises a first box body (1) with a flue gas channel inside, wherein a plurality of transversely extending heat exchange tubes (2) are arranged on the lower portion of the first box body (1) in a penetrating manner, a plurality of transversely extending heat exchange tubes (3) are arranged on the upper portion of the first box body in a penetrating manner, a plurality of heat exchange fins (4) positioned in the flue gas channel are sleeved on the heat exchange tubes (3), one ends of the heat exchange tubes (2) and the heat exchange tubes (3) penetrate out of one side of the first box body (1), the other ends of the heat exchange tubes (2) and the heat exchange tubes (3) penetrate out of the other side of the first box body (1), a first series component for serially connecting the heat exchange tubes (2) in series and a second series component for serially connecting the heat exchange tubes (3) in series are arranged on the first box body (1), the heat exchanger is characterized in that the upper portion of the first box body (1) is, the bottom of the second box body (5) is provided with a combustion plate (6) used for plugging the overflowing channel, the combustion plate (6) is provided with a plurality of overflowing small holes (7) which are uniformly distributed, the overflowing channel is communicated with the flue gas channel through the overflowing small holes (7), and an anti-backfire structure is arranged above the combustion plate (6).

2. The inverted combustion heat exchanger according to claim 1, wherein the anti-backfire structure comprises a guide plate (8) arranged above the combustion plate (6) and used for blocking an overflowing channel, a cavity is formed between the guide plate (8) and the combustion plate (6), the upper end of the overflowing small hole (7) is communicated with the cavity, a plurality of guide holes (9) used for communicating the overflowing channel with the cavity are formed in the guide plate (8), a plurality of flow blocking pieces (10) arranged in one-to-one correspondence with the guide holes (9) are further arranged at the lower portion of the guide plate (8), one end, far away from the guide plate (8), of each flow blocking piece (10) inclines downwards to extend into the cavity, and the guide holes (9) are located above the guide pieces arranged in correspondence with the guide holes.

3. The inverted combustion heat exchanger according to claim 2, wherein the flow guide holes (9) are rectangular, the upper ends of the flow blocking pieces (10) are fixedly connected with one side of the flow guide holes (9), and the width of the flow blocking pieces (10) is equal to the width of the flow guide holes (9) correspondingly arranged.

4. The inverted combustion heat exchanger as set forth in claim 3, characterized in that the lower portion of the second box body (5) is inwardly folded to form a first annular rib (11) disposed in cooperation with the baffle (8), the baffle (8) abuts against the first annular rib (11), the inner ring of the first annular rib (11) is provided with a downwardly extending annular connecting portion, the lower portion of the annular connecting portion is inwardly folded to form a second annular rib (12) disposed in cooperation with the combustion plate (6), and the combustion plate (6) abuts against the second annular rib (12).

5. The inverted combustion heat exchanger as set forth in claim 1, 2, 3 or 4, characterized in that the first series assembly comprises a plurality of first communication bodies (13) arranged on one side of the first tank body (1) and a plurality of second communication bodies (14) arranged on the other side of the first tank body (1), one end of the first heat exchange tube (2) is communicated with the first communication body (13) arranged corresponding to the first heat exchange tube, the other end of the first heat exchange tube (2) is communicated with the second communication body (14) arranged corresponding to the first heat exchange tube, and the first communication bodies (13) and the second communication bodies (14) are sequentially connected in series through the first heat exchange tube (2); the second serial connection assembly comprises a plurality of three communicating bodies (15) arranged on one side of the first box body (1) and a plurality of four communicating bodies (16) arranged on the other side of the first box body (1), one end of the heat exchange tube II (3) is communicated with the three communicating bodies (15) correspondingly arranged with the heat exchange tube II, the other end of the heat exchange tube II (3) is communicated with the four communicating bodies (16) correspondingly arranged with the heat exchange tube II, and the three communicating bodies (15) and the four communicating bodies (16) are sequentially connected in series through the heat exchange tube II (3).

6. The inverted combustion heat exchanger as set forth in claim 5, characterized in that the first communicating body (13) comprises a casing with an opening at one side, a cover (17) is arranged at the opening of the casing, a communicating cavity is formed between the casing and the cover (17), the outer side wall of the cover (17) is attached to the inner side wall of the opening of the casing, the cover (17) is fixedly connected with the casing, the cover (17) is provided with a plurality of connecting holes (18) communicated with the communicating cavity, and one end of the first heat exchange tube (2) extends into the connecting hole (18) correspondingly arranged.

7. The inverted combustion heat exchanger as set forth in claim 1, wherein said plurality of first heat exchange tubes (2) are arranged in at least two transverse rows, the heat exchange tubes (2) in the same transverse row are uniformly distributed, and the heat exchange tubes (2) in one transverse row are staggered with the heat exchange tubes (2) in an adjacent transverse row.

8. The inverted combustion heat exchanger as claimed in claim 1, wherein the heat exchanger fins (4) comprise a plate-shaped body, the body is provided with a plurality of rows of uniformly arranged mounting holes (19), the second heat exchange tubes (3) are arranged in the mounting holes (19) corresponding to the second heat exchange tubes in a penetrating manner, and the peripheries of the mounting holes (19) are provided with annular retaining edges (20) arranged around the second heat exchange tubes (3).

9. The inverted combustion heat exchanger according to claim 8, wherein the body has a first flange (21) at one end thereof and a second flange (22) at the other end thereof disposed opposite to the first flange (21), the first flange (21) has a third flange (23) at a lower end thereof disposed obliquely toward one side of the body, and the second flange (22) has a fourth flange (24) at a lower end thereof disposed opposite to the third flange (23).