CN214665159U - Full-premix heat exchanger, heat exchange structure and honeycomb duct - Google Patents

Abstract

The utility model relates to a full premix heat exchanger, heat exchange structure and honeycomb duct, when the water of heat transfer intracavity was flowed towards the division board at top from bottom to top, because two at least inlet openings on the pipe body distribute respectively in the position that is close to the apopore and keep away from the position of apopore to make the water homoenergetic of division board circumference get into the water conservancy diversion intracavity through the inlet opening that can be even, the water that gets into the water conservancy diversion chamber finally flows to the delivery port of casing through the apopore. Because the hydroenergy with the division board contact can be even the inflow water conservancy diversion intracavity, the hydroenergy of division board contact can be even flows promptly to can be even cool off the division board, avoid appearing because of the local high temperature problem that the inequality of flow arouses, thereby avoid the material fatigue, prolong the life of division board.

Description

Full-premix heat exchanger, heat exchange structure and honeycomb duct

Technical Field

The utility model relates to a heat transfer device technical field especially relates to full premix heat exchanger, heat exchange structure and honeycomb duct.

Background

The full premix heat exchanger adopts a full premix combustion mode, air and gas are fully premixed before being sent to the combustion chamber for combustion, and the gas is fully and stably combusted in the combustion chamber, so that the combustion efficiency is improved, and the emission of harmful substances such as nitrogen oxides is effectively reduced. The heat exchange structure of the fully premixed heat exchanger is used for completing heat exchange between high-temperature flue gas and water, so that hot water is obtained. Traditional heat exchange structure is carrying out the heat exchange in-process, can't carry out even cooling to the diapire in combustion chamber, leads to local high temperature to easily appear in the diapire in combustion chamber, leads to the material fatigue, shortens life.

SUMMERY OF THE UTILITY MODEL

The utility model provides a first technical problem provide a honeycomb duct, it can carry out even cooling to the diapire in burning chamber, avoids appearing local high temperature and the material that arouses is tired, has prolonged life.

The utility model provides a second technical problem provide a heat exchange structure, it can carry out even cooling to the diapire in burning chamber, avoids appearing local high temperature and the material that arouses is tired, has prolonged life.

The utility model provides a third technical problem provide a full premix heat exchanger, it can carry out even cooling to the diapire in burning chamber, avoids appearing local high temperature and the material that arouses is tired, has prolonged life.

The first technical problem is solved by the following technical scheme:

the utility model provides a honeycomb duct, is including being cyclic annular and being equipped with the pipe body in cyclic annular water conservancy diversion chamber, the lateral wall of pipe body is equipped with apopore and two at least inlet openings, the apopore reaches the inlet opening all with the water conservancy diversion chamber is linked together, wherein, at least one the inlet opening is close to the apopore, at least one the inlet opening is kept away from the apopore sets up.

Honeycomb duct, can use in the full premix heat exchanger, compare produced beneficial effect with the background art: when water in the heat exchange cavity flows towards the separation plate at the top from bottom to top, because at least two water inlet holes on the pipe body are respectively distributed at the position close to the water outlet hole and the position far away from the water outlet hole, the water in the circumferential direction of the separation plate can uniformly enter the flow guide cavity through the water inlet holes, and the water entering the flow guide cavity finally flows out to the water outlet of the shell through the water outlet hole. Because the hydroenergy with the division board contact can be even the inflow water conservancy diversion intracavity, the hydroenergy of division board contact can be even flows promptly to can be even cool off the division board, avoid appearing because of the local high temperature problem that the inequality of flow arouses, thereby avoid the material fatigue, prolong the life of division board.

In one embodiment, the pipe body comprises a top part, a bottom part and a middle part positioned between the top part and the bottom part, and at least one of the top part, the bottom part and the middle part is provided with at least two water inlet holes.

The second technical problem is solved by the following technical solutions:

a heat exchange structure comprising:

the water inlet and the water outlet are communicated with the cavity, and the water outlet is arranged above the water inlet;

the water inlet and the water outlet are correspondingly communicated with the heat exchange cavity, and the separation plate is provided with a first through hole for communicating the combustion cavity with the heat exchange cavity;

the heat exchange tube bundle is provided with a heat exchange gap, and the air inlet end of the heat exchange tube bundle is inserted into the first through hole and communicated with the combustion cavity; and

the honeycomb duct of above arbitrary item, the honeycomb duct set up in the heat transfer intracavity, the honeycomb duct cover is located the outer wall of heat transfer tube bank, the honeycomb duct is close to the division board sets up, the apopore with the delivery port corresponds the intercommunication.

Heat exchange structure, can use at the full premix heat exchanger, compare produced beneficial effect with the background art: during the use, the burning structure is igniteed the burning with the gas mixture of combustion intracavity, and the high temperature flue gas that the burning produced passes first through-hole and gets into in the heat exchange tube bank in the heat transfer intracavity to make the high temperature flue gas from last down flow in the heat transfer intracavity. Meanwhile, an external water source enters the heat exchange cavity through the water inlet of the shell and flows towards the water outlet from bottom to top, and the water exchanges heat with the heat exchange tube bundle in the flowing process, so that the water is heated, and the heated water is finally discharged through the water outlet. Wherein, because the delivery port sets up the top at the heat transfer chamber, and be equipped with the cover at the top position of heat transfer chamber or be close to the top position of heat transfer chamber and establish the honeycomb duct in heat transfer tube bank periphery, water after the heating need advance to go into the honeycomb duct after and then flow to the delivery port from the honeycomb duct, utilize the honeycomb duct can make the rivers of heat transfer intracavity more even, thereby can carry out even cooling to the division board at heat transfer chamber top (the diapire in chamber that burns promptly), avoid burning the diapire in chamber local high temperature to appear, and then can avoid appearing the tired problem of material, the service life is prolonged.

In one embodiment, the heat exchange structure further includes a baffle plate, the baffle plate is sleeved on the outer side wall of the heat exchange tube bundle, the baffle plate is arranged below the tube body, and the side wall of the baffle plate is in sealing fit with the inner wall of the heat exchange cavity.

In one embodiment, the heat exchange structure further comprises a smoke exhaust assembly, and the air inlet end of the smoke exhaust assembly is communicated with the air outlet end of the heat exchange tube bundle.

In one embodiment, the smoke exhaust assembly comprises a smoke exhaust water collecting box arranged below the heat exchange tube bundle and a smoke exhaust pipe arranged on the side edge of the heat exchange tube bundle, the smoke exhaust water collecting box is provided with a water accumulating cavity, the water accumulating cavity is used for communicating an air inlet end of the smoke exhaust pipe with an air outlet end of the heat exchange tube bundle, and an air outlet end of the smoke exhaust pipe is arranged above the smoke exhaust water collecting box.

In one embodiment, the heat exchange structure further comprises a base, the base is arranged at the bottom end of the shell, the smoke discharging and water collecting box is connected with the base, the base is provided with a second through hole, and the air outlet end of the heat exchange tube bundle is inserted into the second through hole and communicated with the water accumulation cavity.

In one embodiment, the heat exchange tube bundle comprises at least two heat exchange tubes arranged at intervals, and each heat exchange tube is in a spiral shape or a wave shape in outline.

The third technical problem is solved by the following technical scheme:

a fully premixed heat exchanger comprises a combustion structure and the heat exchange structure, wherein the combustion structure is used for igniting mixed gas in a combustion cavity.

Full premix heat exchanger, compare produced beneficial effect with the background art: the burning structure is igniteed the burning to the mist of the air that mixes in advance and gas, and the high temperature flue gas that the burning produced gets into the heat exchange structure in, and the high temperature flue gas carries out the heat exchange with water in the heat exchange structure to heat water in order to externally provide heating hot water and life bathroom hot water. And, hydroenergy in the heat exchange structure can be even flows to can carry out even cooling to the diapire in burning chamber, avoid burning the diapire in chamber to appear local high temperature, and then can avoid appearing the tired problem of material, prolong life.

In one embodiment, the combustion structure comprises a cover body and an ignition combustion element, the ignition combustion element is connected with the cover body, the cover body is covered on an opening of the combustion cavity, so that the ignition combustion element is arranged in the combustion cavity, and the cover body is provided with a flow guide channel communicated with the combustion cavity.

In one embodiment, the front surface of the cover body is provided with a reinforcing rib; and/or the cover body is provided with a fire observation window; and/or the cover body is provided with an oxygen detection element for detecting the smoke condition in the combustion cavity; and/or the cover body is provided with an ignition feedback element for detecting the flame combustion condition in the combustion chamber; and/or the full premix heat exchanger further comprises a sealing element, and the sealing element is arranged between the cover body and the shell body to enable the cover body and the shell body to be connected in a sealing mode; and/or the fully premixed heat exchanger further comprises a thermal insulating element disposed between the ignition combustion element and the cover.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of a fully premixed heat exchanger;

FIG. 2 is an exploded view of the fully premixed heat exchanger of FIG. 1;

FIG. 3 is a cross-sectional view in the direction A-A of the fully premixed heat exchanger of FIG. 1;

FIG. 4 is a cross-sectional view in the direction B-B of the fully premixed heat exchanger of FIG. 1;

FIG. 5 is an enlarged fragmentary view of a portion of the fully premixed heat exchanger C of FIG. 4;

FIG. 6 is an enlarged fragmentary view of a portion of the fully premixed heat exchanger D of FIG. 4;

FIG. 7 is a schematic structural view of a combustion configuration of the fully premixed heat exchanger of FIG. 1;

FIG. 8 is a schematic diagram of the heat exchange structure of the fully premixed heat exchanger of FIG. 1;

FIG. 9 is a schematic view of the heat exchange structure of FIG. 8 between the divider plate and the base;

FIG. 10 is a schematic view of the flow conduit of the heat exchange structure of FIG. 8;

FIG. 11 is a schematic structural view of a connecting plate of the heat exchange structure of FIG. 8;

fig. 12 is a schematic structural view of a smoke exhaust header box of the heat exchange structure of fig. 8.

Reference numerals:

10. a fully premixed heat exchanger; 100. a flow guide pipe; 110. a tube body; 111. a water outlet hole; 112. a water inlet hole; 120. a top portion; 130. a bottom; 140. an intermediate portion; 200. a housing; 210. a cavity; 211. a combustion chamber; 212. a heat exchange cavity; 220. a water inlet; 230. a water outlet; 300. a partition plate; 310. a first through hole; 400. a heat exchange tube bundle; 410. a heat exchange pipe; 420. a heat exchange gap; 510. a baffle plate; 520. a base; 521. a second through hole; 530. a connecting rod; 610. a smoke discharging and water collecting box; 611. a water accumulation cavity; 612. a drain hole; 620. a smoke exhaust pipe; 700. a combustion structure; 710. a cover body; 720. an ignition combustion element; 730. a fire observation window; 740. an oxygen detecting element; 750. an ignition feedback element; 760. a sealing element; 770. an insulating element; 800. a connecting plate; 810. and an annular boss.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In one embodiment, referring to fig. 1-4, a fully premixed heat exchanger 10 is provided, including a combustion structure 700 and a heat exchange structure. So, burning structure 700 ignites the burning to the mist of the air that mixes in advance and gas, and in the high temperature flue gas that the burning produced got into heat exchange structure, the high temperature flue gas carries out the heat exchange with water in heat exchange structure to heat water in order to externally provide heating hot water and life bathroom hot water. And, the hydroenergy in the heat exchange structure can be even flows to can carry out even cooling to the diapire of burning chamber 211, avoid burning chamber 211's diapire local high temperature to appear, and then can avoid appearing the tired problem of material, prolong life.

The fully premixed heat exchanger 10 can supply hot water for building houses such as hotels, districts and shopping malls in the form of a hot water boiler, and the application form and the application occasion are not limited, and only the use requirement is met.

In one embodiment, referring to fig. 1 to 4 and 8, a heat exchange structure is provided, which includes a shell 200, a partition plate 300, a heat exchange tube bundle 400 and a draft tube 100. The housing 200 has a cavity 210, a water inlet 220 and a water outlet 230, the water inlet 220 and the water outlet 230 are both connected to the cavity 210, and the water outlet 230 is disposed above the water inlet 220. The partition plate 300 is disposed in the cavity 210 and divides the cavity 210 into a combustion chamber 211 and a heat exchange chamber 212, the water inlet 220 and the water outlet 230 are correspondingly communicated with the heat exchange chamber 212, and the partition plate 300 is provided with a first through hole 310 communicating the combustion chamber 211 and the heat exchange chamber 212. The heat exchange tube bundle 400 is provided with a heat exchange gap 420, and an air inlet end of the heat exchange tube bundle 400 is inserted into the first through hole 310 and is communicated with the combustion chamber 211. The draft tube 100 is arranged in the heat exchange cavity 212, the draft tube 100 is sleeved on the outer wall of the heat exchange tube bundle 400, the draft tube 100 is arranged close to the partition plate 300, and the draft tube 100 is correspondingly communicated with the water outlet 230.

The heat exchange structure of the above embodiment can be applied to a fully premixed heat exchanger, when in use, the combustion structure 700 ignites and combusts the mixed gas in the combustion cavity 211, and the high-temperature flue gas generated by combustion passes through the first through hole 310 and enters the heat exchange tube bundle 400 in the heat exchange cavity 212, so that the high-temperature flue gas flows from top to bottom in the heat exchange cavity 212. Meanwhile, an external water source enters the heat exchange cavity 212 through the water inlet 220 of the shell 200 and flows towards the water outlet 230 from bottom to top, the water exchanges heat with the heat exchange tube bundle 400 in the flowing process, so that the water is heated, and the heated water is finally discharged through the water outlet 230. Wherein, because delivery port 230 sets up the top at heat transfer chamber 212, and be equipped with the cover at the top position of heat transfer chamber 212 or be close to the top position of heat transfer chamber 212 and establish the honeycomb duct 100 in heat transfer tube bundle 400 periphery, water after the heating need flow out to delivery port 230 from honeycomb duct 100 after entering honeycomb duct 100 earlier, utilize honeycomb duct 100 can make the more even of the water flow in the heat transfer chamber 212, thereby can carry out even cooling to the division board 300 at heat transfer chamber 212 top (the diapire of burning chamber 211 promptly), avoid burning the diapire of chamber 211 to appear local high temperature, and then can avoid appearing the tired problem of material, service life has been prolonged.

It should be noted that, the draft tube 100 is disposed close to the partition plate 300, a preset gap may be left between the draft tube 100 and the partition plate 300, or the draft tube 100 is attached to the partition plate 300, and there is no gap, so that only the requirement that the heated water flows out from the water outlet 230 of the housing 200 after passing through the uniform flow guide of the draft tube 100 is satisfied, and thus, the water at the partition plate 300 flows more uniformly and can cool the partition plate 300 uniformly.

The partition plate 300 may be connected to the inner wall of the cavity 210 by welding, riveting, screwing, or the like, so as to divide the cavity 210 into the combustion chamber 211 located above and the heat exchange chamber 212 located below.

Wherein, heat exchange clearance 420 of heat exchange tube bundle 400 can be that the outer wall of heat exchange tube bundle 400 forms with the inner wall of heat exchange cavity 212, also can be that heat exchange tube bundle 400 includes two at least heat exchange tubes 410 that the interval set up, and the clearance between two adjacent heat exchange tubes 410 forms heat exchange clearance 420. The heat exchange tube bundle 400 may be welded or filled to be hermetically connected to the inner wall of the first through hole 310, so as to prevent water in the heat exchange cavity 212 from entering the combustion cavity 211. When the heat exchange tube bundle 400 includes at least two heat exchange tubes 410 disposed at intervals, each heat exchange tube 410 is disposed corresponding to one of the first through holes 310.

In one embodiment, referring to fig. 2-4 and 8, the heat exchange tube bundle 400 includes at least two spaced heat exchange tubes 410, and each heat exchange tube 410 has a spiral or wavy profile. So, make high temperature flue gas in heat exchange tube 410 supreme down take place torrent and turbulent flow when circulating for can erode the inner wall of heat exchange tube 410, make the comdenstion water in the heat exchange tube 410 can in time erode under the effect of gravity and scouring force and throw away, can not form the water film and with the separation heat transfer, improve heat exchange efficiency, and also can not the scale deposit and block up. Meanwhile, a heat exchange gap 420 is formed between every two adjacent heat exchange tubes 410, so that the track from the heat exchange gap 420 to the bottom up is also spiral or wavy, when water flows in the heat exchange gap 420 from the bottom up, the water can generate turbulence and turbulent flow, the outer wall of each heat exchange tube 410 can be washed, the heat exchange gap 420 is prevented from being blocked, and the heat exchange is ensured to be normally carried out; moreover, the track from the heat exchange gap 420 to the bottom up is also spiral or wavy, so that the length of the heat exchange gap 420 is also prolonged, and the heat exchange efficiency is improved. The cross-sectional shape of the heat exchange tube 410 may be a flat shape such as an ellipse.

In one embodiment, referring to fig. 10, a flow guiding tube 100 is provided, which includes a tube body 110 having a ring shape and a flow guiding cavity (not labeled). The side wall of the pipe body 110 is provided with a water outlet hole 111 and at least two water inlet holes 112, and both the water outlet hole 111 and the water inlet holes 112 are communicated with the diversion cavity. Wherein at least one water inlet 112 is close to the water outlet 111, and at least one water inlet 112 is far from the water outlet 111.

The draft tube 100 of the above embodiment can be applied to the fully premixed heat exchanger 10, when water in the heat exchange cavity 212 flows from bottom to top toward the top partition plate 300, because the at least two water inlet holes 112 on the tube body 110 are respectively distributed at the position close to the water outlet hole 111 and the position far away from the water outlet hole 111, water in the circumferential direction of the partition plate 300 can uniformly enter the draft tube cavity through the water inlet holes 112, and the water entering the draft tube cavity finally flows out to the water outlet 230 of the housing 200 through the water outlet hole 111. Because the water that contacts with division board 300 can be even the inflow water conservancy diversion intracavity, the water that the division board 300 contacted can be even flows promptly to can be even cool off division board 300, avoid appearing because of the local high temperature problem that the inequality that flows arouses, thereby avoid the material fatigue, prolong division board 300's life.

In the conventional heat exchange structure, when water flows from the water inlet 220 to the water outlet 230, the water outlet 230 is disposed at one side of the housing 200, so that the flow rate of water at the side close to the water outlet 230 is fast, and the flow rate at the side far from the water outlet 230 is slow or even does not flow, thereby causing uneven flow of water at the position close to the partition plate 300, and further, the partition plate 300 cannot be uniformly cooled to cause local high temperature of the partition plate 300, so that material fatigue occurs and the service life of the partition plate 300 is shortened. The honeycomb duct 100 of the above embodiment can make the water close to one side of the water outlet 230 and the water far from one side of the water outlet 230 all enter the water guide cavity in the same or substantially the same inflow, and then flow out to the water outlet 230 through the water outlet hole 111, so that the water at the partition plate 300 flows uniformly, the partition plate 300 can be cooled uniformly, local high temperature of the partition plate 300 is avoided, and the service life of the partition plate 300 is prolonged.

The annular pipe body 110 may be circular or square; the outlet hole 111 may be disposed at an outer side of the pipe body 110, and the at least two inlet holes 112 may be uniformly disposed around a central axis of the pipe body 110, so that water around the partition plate 300 can flow into the flow guide cavity at the same or substantially the same flow rate, and the partition plate 300 can be uniformly cooled. The number and the opening positions of the water inlet holes 112 may be flexibly designed or selected according to actual cooling needs, for example, the number may be ten, twenty, thirty or other numbers, which is not limited herein.

In one embodiment, referring to fig. 10, the tube body 110 includes a top portion 120, a bottom portion 130, and a middle portion 140 between the top portion 120 and the bottom portion 130. At least one of the top portion 120, the bottom portion 130 and the middle portion 140 has at least two water inlet holes 112. So, make the hydroenergy that division plate 300 goes out can be nimble, the entering water conservancy diversion intracavity of multi-angle to make the rivers of division plate 300 department more even, and then can be more even cool off division plate 300. Preferably, the top part 120 of the pipe body 110 is provided with at least two water inlet holes 112, the middle part 140 of the pipe body 110 is provided with at least two water inlet holes 112, and the bottom part 130 of the pipe body 110 is also provided with at least two water inlet holes 112, so that water at the circumferential position of the partition plate 300 can flow into the flow guide cavity at the same or substantially the same flow rate, and the partition plate 300 is cooled more uniformly. Here, the top part 120 of the tube body 110 refers to a portion of the tube body 110 close to the partition plate 300, the bottom part 130 of the tube body 110 refers to a portion of the tube body 110 far from the partition plate 300, and the middle part 140 of the tube body 110 refers to a portion between the bottom part 130 and the top part 120.

In one embodiment, referring to fig. 1, fig. 2, fig. 4, fig. 8 and fig. 9, the heat exchange structure further includes a baffle 510. The baffle 510 is sleeved on the outer side wall of the heat exchange tube bundle 400, the baffle 510 is disposed below the tube body 110, and the side wall of the baffle 510 is in sealing fit with the inner wall of the heat exchange cavity 212. So, when the water in heat transfer chamber 212 up the in-process that flows down, utilize the cover to establish baffle 510 on the lateral wall of heat transfer tube bundle 400 and can carry out the choked flow to rivers to make rivers draw close towards the centre of heat transfer chamber 212, and then make rivers can be abundant with the contact of heat transfer tube bundle 400 and carry out the heat transfer, improved heat exchange efficiency. The number of the baffles 510 may be flexibly designed or selected according to actual needs, and may be at least two, for example, three baffles may be distributed in an upper, middle and lower direction, and the distance between adjacent baffles 510 may also be flexibly adjusted according to actual needs; the outer side wall of the baffle 510 can be in sealing fit with the inner wall of the heat exchange cavity 212 by welding, filling and the like; referring to fig. 1, 2, 8 and 9, the baffle 510 may be connected to the partition plate 300 by a connecting rod 530, the baffle 510 is provided with an insertion hole, the connecting rod 530 penetrates through the baffle 510, and the upper end of the connecting rod 530 is welded or screwed to the partition plate 300, so as to fix the baffle 510.

In addition to any of the above embodiments, the heat exchange structure further comprises a smoke exhaust assembly (not labeled). The inlet end of the smoke evacuation assembly communicates with the outlet end of the heat exchange tube bundle 400. So, utilize the subassembly of discharging fume to discharge the flue gas to the external world after accomplishing the heat transfer, what the high temperature flue gas of being convenient for lasts carries out the heat transfer with water.

Specifically, referring to fig. 1, fig. 2, fig. 3, fig. 8 and fig. 12, the smoke evacuation assembly includes a smoke evacuation header box 610 disposed below the heat exchange tube bundle 400, and a smoke evacuation pipe 620 disposed at a side of the heat exchange tube bundle 400. The smoke exhaust water collecting box 610 is provided with a water collecting cavity 611, and the water collecting cavity 611 is used for communicating the air inlet end of the smoke exhaust pipe 620 with the air outlet end of the heat exchange pipe bundle 400. Therefore, the flue gas flowing out of the heat exchange tube bundle 400 firstly enters the water accumulation cavity 611 and then enters the smoke exhaust pipe 620 to be exhausted to the outside; and, utilize ponding chamber 611 can collect the comdenstion water, avoid the comdenstion water to cause the influence to the heat transfer. The air outlet end of the smoke exhaust pipe 620 is arranged above the smoke exhaust water collecting box 610. Thus, the smoke exhaust pipe 620 is conveniently communicated with the external flue. The smoke exhaust water collecting box 610 can be further provided with a drain hole 612, condensed water can be timely drained to an external neutralizer through the drain hole 612, and corrosion caused by the condensed water collecting on the smoke exhaust water collecting box 610 is avoided. The smoke exhaust pipe 620 may be any existing pipe capable of adapting to smoke exhaust, for example, a flat ring-shaped smoke pipe; reinforcing ribs can also be arranged on the smoke exhaust pipe 620 to improve the strength; the profile of the outlet end of the smoke exhaust pipe 620 may be circular to facilitate the butt joint with other flues.

Further, referring to fig. 2, fig. 4, fig. 8 and fig. 9, the heat exchange structure further includes a base 520. The base 520 is disposed at the bottom end of the housing 200. The smoke exhaust water collecting box 610 is connected with the base 520 by welding, screwing, riveting or the like. In this way, the bottom end of the housing 200 is closed by the base 520 and provides support for the installation of the smoke collection box 610. The base 520 is provided with a second through hole 521, and the air outlet end of the heat exchange tube bundle 400 is inserted into the second through hole 521 and communicated with the water accumulation cavity 611. In this way, the heat exchange tube bundle 400 is stably and reliably fixed in the heat exchange cavity 212 by the assembly between the base 520 and the heat exchange tube bundle 400. Wherein, the heat exchange tube bundle 400 can be hermetically connected with the inner wall of the second through hole 521 by welding or filling, so as to prevent water in the heat exchange cavity 212 from flowing out. When the heat exchange tube bundle 400 includes at least two heat exchange tubes 410 arranged at intervals, each heat exchange tube 410 is arranged corresponding to one second through hole 521. Of course, the lower end of the connecting rod 530 may be connected to the base 520.

The combustion structure 700 may be any conventional device that can ignite and burn a pre-mixed gas mixture of air and gas.

In one embodiment, referring to fig. 5-7, the combustion structure 700 includes a cover 710 and an ignition combustion element 720. Ignition combustion element 720 and lid 710 adopt modes such as spiro union, joint or riveting to be connected, and lid 710 lid is established on the opening of burning chamber 211 to utilize lid 710 to seal burning chamber 211, and make ignition combustion element 720 set up in burning chamber 211, and lid 710 is equipped with the water conservancy diversion passageway with burning chamber 211 intercommunication. In this way, the premixed mixture of air and gas enters the combustion chamber 211 through the diversion channel, and is ignited by the ignition combustion element 720, so that the mixture is combusted in the combustion chamber 211 to generate high-temperature flue gas. The ignition combustion element 720 may be any device capable of performing ignition combustion, such as a spark plug.

In one embodiment, the front surface of the cover 710 is provided with a stiffener (not shown). So, utilize the strengthening rib not only can strengthen the intensity of lid 710, can increase the surface area of lid 710 moreover to increase lid 710 and external area of contact, when external air blows the front of lid 710, can take away more heats, the lid 710 of being convenient for dispels the heat and avoids arousing damage or fatigue because of the high temperature. The reinforcing ribs can be in the form of convex ribs, bosses and the like.

In one embodiment, referring to fig. 6 and 7, the cover 710 has a fire window 730. Thus, the flame combustion condition in the combustion chamber 211 can be conveniently, intuitively and real-timely observed by utilizing the fire observation window 730, and the combustion dynamics can be macroscopically mastered. The fire observation window 730 can be formed by covering fire observation glass after the fire observation hole is formed, and the fire observation glass can be fixedly arranged in the fire observation hole in a pressing plate pressing or bonding mode and the like.

In one embodiment, referring to fig. 5 and 7, the cover 710 is provided with an oxygen detecting element 740 for detecting the condition of the flue gas in the combustion chamber 211. So, utilize oxygen detecting element 740 to detect the flue gas situation to can feed back the real-time operating mode of the burning of the gas mixture in the combustion chamber 211 in real time and feed back to the main control panel according to the demand and carry out the burning regulation, in order to satisfy normal burning condition. The oxygen detecting element 740 may be an oxygen sensor or the like, and is fixed on the cover 710 in an inserting manner or a clamping manner.

In one embodiment, referring to FIG. 7, the cover 710 is provided with an ignition feedback element 750 for detecting a flame combustion condition within the combustion chamber 211. In this way, the ignition feedback element 750 can be used to detect the flame combustion condition in the combustion chamber 211 in real time, which is beneficial to improving the combustion condition. The ignition feedback element 750 may be an ignition feedback pin or the like, and the ignition feedback element 750 may cooperate with the oxygen detection element 740 to effectively adjust the combustion condition.

The cover 710 and the housing 200 may be directly connected by riveting, clamping, or welding, or an intermediate element may be present (for example, please refer to fig. 2, 8, 9, and 11, a connecting plate 800 may be additionally disposed between the cover 710 and the housing 200, the connecting plate 800 and the housing 200 are connected by screwing, riveting, or welding, and the cover 710 and the connecting plate 800 are connected by welding, pressing, or clamping), so long as effective sealing of the combustion chamber 211 is achieved.

In one embodiment, referring to fig. 5 and 6, the fully premixed heat exchanger 10 further includes a sealing element 760, wherein the sealing element 760 is disposed between the cover 710 and the casing 200, so that the cover 710 and the casing 200 are hermetically connected. Thus, the combustion chamber 211 can be more effectively sealed by the sealing element 760, the air leakage problem can be effectively avoided, and the mixed gas can be fully combusted. The sealing element 760 may be a sealing ring or the like. Referring to fig. 5, 6 and 11, an installation groove for installing the sealing element 760 may be formed on the cover 710, an annular boss 810 is disposed at a position corresponding to the installation groove of the housing 200 (the annular boss 810 may also be disposed on the connection plate 800), and the annular boss 810 extends into the installation groove to press and connect the sealing element 760, so that the cover 710 and the housing 200 are stably and effectively connected in a sealing manner.

In one embodiment, referring to fig. 5-7, the fully premixed heat exchanger 10 further includes an insulating element 770, the insulating element 770 being disposed between the firing combustion element 720 and the cover 710. Therefore, the heat insulation element 770 can effectively prevent the high-temperature flue gas in the combustion chamber 211 from transferring heat to the cover body 710, prevent the cover body 710 from aging or fatigue due to overhigh temperature, and prolong the service life of the cover body 710. The heat insulation member 770 may be fixed to the back of the cover 710 by screwing, bonding, or the like. The insulating element 770 may be an insulating vermiculite or like element.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (11)

1. The flow guide pipe is characterized by comprising an annular pipe body (110) provided with an annular flow guide cavity, wherein the side wall of the pipe body (110) is provided with a water outlet (111) and at least two water inlets (112), the water outlet (111) and the water inlets (112) are communicated with the flow guide cavity, at least one water inlet (112) is close to the water outlet (111), and at least one water inlet (112) is far away from the water outlet (111).

2. The draft tube of claim 1, wherein the tube body (110) comprises a top portion (120), a bottom portion (130), and an intermediate portion (140) between the top portion (120) and the bottom portion (130), at least one of the top portion (120), the bottom portion (130), and the intermediate portion (140) having at least two of the water inlet holes (112).

3. A heat exchange structure, comprising:

the water inlet (220) and the water outlet (230) are communicated with the cavity (210), and the water outlet (230) is arranged above the water inlet (220);

the separation plate (300) is arranged in the cavity (210) and divides the cavity (210) into a combustion cavity (211) and a heat exchange cavity (212), the water inlet (220) and the water outlet (230) are correspondingly communicated with the heat exchange cavity (212), and the separation plate (300) is provided with a first through hole (310) for communicating the combustion cavity (211) with the heat exchange cavity (212);

the heat exchange tube bundle (400), the heat exchange tube bundle (400) is provided with a heat exchange gap (420), and the air inlet end of the heat exchange tube bundle (400) is inserted into the first through hole (310) and communicated with the combustion cavity (211); and

the draft tube (100) of claim 1 or 2, wherein the draft tube (100) is disposed in the heat exchange cavity (212), the draft tube (100) is sleeved on the outer wall of the heat exchange tube bundle (400), the draft tube (100) is disposed near the partition plate (300), and the water outlet hole (111) is correspondingly communicated with the water outlet (230).

4. The heat exchange structure according to claim 3, further comprising a baffle (510), wherein the baffle (510) is sleeved on an outer side wall of the heat exchange tube bundle (400), the baffle (510) is disposed below the tube body (110), and a side wall of the baffle (510) is in sealing fit with an inner wall of the heat exchange cavity (212).

5. Heat exchange structure according to claim 3 or 4, further comprising a smoke evacuation assembly, the inlet end of which communicates with the outlet end of the heat exchange tube bundle (400).

6. The heat exchange structure according to claim 5, wherein the smoke exhaust assembly comprises a smoke exhaust water collecting box (610) arranged below the heat exchange tube bundle (400) and a smoke exhaust pipe (620) arranged at the side of the heat exchange tube bundle (400), the smoke exhaust water collecting box (610) is provided with a water accumulating cavity (611), the water accumulating cavity (611) is used for communicating the air inlet end of the smoke exhaust pipe (620) with the air outlet end of the heat exchange tube bundle (400), and the air outlet end of the smoke exhaust pipe (620) is arranged above the smoke exhaust water collecting box (610).

7. The heat exchange structure according to claim 6, further comprising a base (520), wherein the base (520) is disposed at a bottom end of the shell (200), the smoke evacuation water collection box (610) is connected to the base (520), the base (520) is provided with a second through hole (521), and an air outlet end of the heat exchange tube bundle (400) is inserted into the second through hole (521) and is communicated with the water collection cavity (611).

8. Heat exchange structure according to claim 3 or 4, characterised in that said bundle (400) comprises at least two heat exchange tubes (410) arranged at intervals, each heat exchange tube (410) having a profile in the form of a spiral or a wave.

9. A fully premixed heat exchanger, characterized in that it comprises a combustion structure (700) and a heat exchange structure according to any one of claims 3 to 8, said combustion structure (700) being intended to ignite the mixture inside said combustion chamber (211).

10. The fully premixed heat exchanger according to claim 9, wherein the combustion structure (700) comprises a cover body (710) and an ignition combustion element (720), the ignition combustion element (720) is connected with the cover body (710), the cover body (710) is covered on the opening of the combustion chamber (211), the ignition combustion element (720) is arranged in the combustion chamber (211), and the cover body (710) is provided with a flow guide channel communicated with the combustion chamber (211).

11. The fully premixed heat exchanger of claim 10, wherein the front face of the cover (710) is provided with ribs; and/or the cover body (710) is provided with a fire observation window (730); and/or the cover (710) is provided with an oxygen detection element (740) for detecting the smoke condition in the combustion chamber (211); and/or the cover (710) is provided with an ignition feedback element (750) for detecting a flame combustion condition within the combustion chamber (211); and/or the fully premixed heat exchanger (10) further comprises a sealing element (760), the sealing element (760) being disposed between the cover (710) and the housing (200) to sealingly connect the cover (710) and the housing (200); and/or the fully premixed heat exchanger (10) further comprises an insulating element (770), the insulating element (770) being disposed between the firing combustion element (720) and the cover (710).

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