Condensing heat exchanger and gas equipment

Abstract

The utility model discloses a condensing heat exchanger and fuel gas equipment, the condensing heat exchanger comprises a shell, a first heat exchanger, a second heat exchanger, a heat exchanger, a heat exchanger and a heat exchanger, the shell is provided with a first port and a second port, the heat exchange pipe is arranged in the flue, the heat exchange pipe is formed by bending a single pipe into a roundabout structure, the two ends of the heat exchange pipe are assembled and connected with the shell in a non-welding mode, the input end of the heat exchange pipe is communicated with the first port, and the output end of the heat exchange pipe is communicated with the second port. According to the technical scheme, the structure of the condensation heat exchanger can be simplified, the machining difficulty and cost are reduced, and the sealing reliability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of condensing heat exchange equipment, in particular to a condensing heat exchanger and a gas equipment. Background Art

[0002] At present, the gas water heater industry has gradually upgraded and iterated towards high energy efficiency. Some gas equipment with higher energy efficiency requirements (such as condensing gas water heaters) are usually equipped with a primary heat exchanger and a condensing heat exchanger (also called a secondary heat exchanger). Through two-stage heat exchange, the heat in the high-temperature flue gas can be fully utilized, so that its efficiency can reach the first-level energy efficiency, meeting the requirements of high energy efficiency.

[0003] However, the heat exchange tubes of traditional condensing heat exchangers mostly adopt a parallel structure. During production, multiple parallel tubes need to be brazed together to form parallel heat exchange tubes, and then the two ends of the heat exchange tubes are brazed together with the shell of the condensing heat exchanger. This makes the structure of the condensing heat exchanger complex, difficult to process, and has a high manufacturing cost. In addition, there are many welding points, many leakage points, and low sealing reliability. Utility Model Content

[0004] The main purpose of the utility model is to provide a condensing heat exchanger, aiming to simplify the structure of the condensing heat exchanger, reduce the processing difficulty and cost, and improve the sealing reliability.

[0005] In order to achieve the above-mentioned object, the condensing heat exchanger proposed by the utility model comprises:

[0006] a shell having a flue formed therein, the shell being provided with a first port and a second port; and

[0007] A heat exchange tube is arranged in the flue, and the heat exchange tube is formed by bending a single tube into a tortuous structure. Both ends of the heat exchange tube are respectively assembled and connected to the shell in a non-welding manner, the input end of the heat exchange tube is connected to the first port, and the output end of the heat exchange tube is connected to the second port.

[0008] In one embodiment, the shell includes a shell body, and a first joint and a second joint provided on the shell body, the flue is formed inside the shell body, the first joint is provided with the first port, the second joint is provided with the second port, the input end of the heat exchange tube is detachably connected to the first joint, and the output end of the heat exchange tube is detachably connected to the second joint.

[0009] In one embodiment, the heat exchange tube is respectively locked and fixed to the first joint and the second joint through threaded connectors.

[0010] In one of the embodiments, the shell body includes a water collecting tray with an open top, and a cover body covered on the top of the water collecting tray, the cover body and the water collecting tray are arranged to form the flue, the water collecting tray is provided with a smoke inlet and a drain outlet, the cover body is provided with a smoke exhaust outlet, the smoke inlet, the drain outlet and the smoke exhaust outlet are respectively connected to the flue, and the water collecting tray adopts an integrally formed structure.

[0011] In one embodiment, the heat exchange tube includes a plurality of heat exchange tube segments and a plurality of bent tube segments connecting the plurality of heat exchange tube segments in series, the extension direction of each heat exchange tube segment intersects with the flue gas outflow direction of the flue, and the plurality of heat exchange tube segments are arranged in at least two layers along the flue gas outflow direction of the flue;

[0012] And / or, the inner diameter of the heat exchange tube is not less than 12 cm and not more than 20 cm.

[0013] In one of the embodiments, the condensing heat exchanger also includes a guide member arranged in the shell, the guide member divides the flue into a zigzag shape, the bottom wall of the shell is provided with a smoke inlet opposite to the bottom surface of the guide member, the top wall of the shell is provided with a smoke exhaust port opposite to the top surface of the guide member, the smoke inlet is connected with the smoke exhaust port via the flue, and the heat exchange pipe is arranged between the guide member and the bottom wall of the shell.

[0014] In one of the embodiments, the guide member includes a guide portion opposite to the smoke inlet, and the guide portion is used to guide the smoke flowing in from the smoke inlet to swirl at a preset angle and then flow toward the bottom of the heat exchange tube.

[0015] In one embodiment, the shell has a first side wall and a second side wall opposite to each other, the guide member includes a first guide plate and a second guide plate connected to each other, the first guide plate is arranged adjacent to the first side wall, the second guide plate extends from the side edge of the first guide plate toward the second side wall and is arranged downwardly inclined, a gap is formed between the second guide plate and the second side wall, the smoke inlet is arranged opposite to the first guide plate, the guide portion is arranged on the first guide plate, and the heat exchange tube is located between the second guide plate and the bottom wall of the shell.

[0016] In one embodiment, the first guide plate is arched relative to the second guide plate toward a side away from the smoke inlet, and the first guide plate is surrounded to form a groove facing the smoke inlet, and the groove forms the guide portion.

[0017] In one embodiment, a corner is formed at the junction of the first guide plate and the second guide plate, and an angle α is formed between the outer section of the first guide plate near the corner and the upper plate surface of the first guide plate, wherein α is not less than 80° and not more than 130°.

[0018] The utility model also provides a gas equipment, comprising the condensing heat exchanger as described above.

[0019] The technical solution of the utility model can extend the length of the heat exchange tube as much as possible within a limited space by bending the heat exchange tube of the condensing heat exchanger into a tortuous structure using a single tube, thereby increasing the heat exchange area and improving the heat exchange efficiency. Compared with the traditional condensing heat exchanger that uses multiple tubes brazed in parallel to form a heat exchange tube, the heat exchange tube in the present technical solution uses a single tube to bend to form multiple heat exchange tube sections connected in series. The entire heat exchange tube has only one inlet and one outlet, and the structure is simpler, which can reduce the difficulty of processing and reduce costs; and because the various tube sections of the heat exchange tube do not need to be connected by welding, the two ends of the heat exchange tube are respectively assembled and connected to the shell by non-welding methods, so that the leakage points formed by welding can be avoided, thereby improving the sealing reliability and reducing the leakage risk of the fluid medium in the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a structural schematic diagram of an embodiment of a condensing heat exchanger of the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the condensing heat exchanger;

[0023] Figure 3 It is a schematic diagram of assembling the heat exchange tube of the condensing heat exchanger and the first joint and the second joint;

[0024] Figure 4 It is a structural schematic diagram of an embodiment of the gas equipment of the present utility model.

[0025] Description of Figure Numbers:

[0026]

[0027]

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] At present, the gas water heater industry has gradually upgraded and iterated towards high energy efficiency. For example, condensing gas water heaters are usually equipped with a primary heat exchanger and a condensing heat exchanger (also called a secondary heat exchanger). Through two-stage heat exchange, the heat in the high-temperature flue gas can be fully utilized, so that its efficiency can reach the primary energy efficiency, meeting the requirements of high energy efficiency. However, the price of condensing gas water heaters is much higher than that of ordinary gas water heaters. Consumers often think that the gas cost of energy saving is not as much as the cost of the product price, and the overall cost performance is not high. The main reason is that the manufacturing cost of the condensing heat exchanger in the condensing gas water heater is relatively high.

[0033] The main reason for the high cost of traditional condensing heat exchangers is that most of their heat exchange tubes adopt a parallel structure. The parallel heat exchange tube has a water inlet structure that is divided into multiple parts. During production and manufacturing, multiple parallel tubes need to be brazed to form parallel heat exchange tubes, and then the two ends of the heat exchange tubes are brazed to the shell of the condensing heat exchanger, which makes the structure of the condensing heat exchanger complex, difficult to process, and has a high manufacturing cost. In addition, multiple parallel tubes are connected by brazing, which results in more welding points, more water leakage points, and lower sealing reliability.

[0034] Based on this, the utility model proposes a condensing heat exchanger 100. By optimizing the design of the condensing heat exchanger 100, the structure of the condensing heat exchanger 100 can be simplified, the processing difficulty and cost can be reduced, and the sealing reliability can be improved, thereby reducing the risk of leakage of the fluid medium in the heat exchange tube 20.

[0035] Please refer to Figures 1 to 3 In one embodiment of the utility model, the condensing heat exchanger 100 includes a shell 10 and a heat exchange tube 20. A flue 101 is formed inside the shell 10, and the shell 10 is provided with a first port 102 and a second port 103; the heat exchange tube 20 is arranged in the flue 101, and the heat exchange tube 20 is bent into a tortuous structure by a single tube, and the two ends of the heat exchange tube 20 are respectively assembled and connected with the shell 10 by non-welding, and the input end of the heat exchange tube 20 is connected with the first port 102, and the output end of the heat exchange tube 20 is connected with the second port 103.

[0036] like Figure 4 As shown, taking the condensing heat exchanger 100 applied to a gas water heater as an example, the gas water heater includes a burner 300, a primary heat exchanger 400 and a condensing heat exchanger 100 arranged in sequence, wherein the first port 102 of the condensing heat exchanger 100 can be used as a water inlet to communicate with the water outlet of the cold water inlet pipe 500, the second port 103 of the condensing heat exchanger 100 can be used as a water outlet to communicate with the water inlet of the primary heat exchanger 400, and the water outlet of the primary heat exchanger 400 is connected to the water inlet of the hot water outlet pipe 600. The high-temperature flue gas generated by the combustion of the burner 300 enters the condensing heat exchanger 100 for secondary heat exchange after heat exchange in the primary heat exchanger 400, so that the latent heat in the flue gas can be fully utilized to improve the efficiency of the whole machine. Furthermore, when the gas water heater is working, the cold water in the cold water inlet pipe 500 can be first transported to the heat exchange tube 20 of the condensing heat exchanger 100 for preheating, and then transported to the primary heat exchanger 400 for heating, which can improve the heating efficiency and achieve rapid hot water output.

[0037] In this embodiment, the condensing heat exchanger 100 includes a shell 10 and a heat exchange tube 20. The shell 10 can be made of sheet metal material, so that the shell 10 as a whole has high structural strength, corrosion resistance and heat resistance. A flue 101 for high-temperature flue gas to pass through is constructed inside the shell 10, and a fluid channel for a fluid medium (such as water) to pass through is constructed inside the heat exchange tube 20. The heat exchange tube 20 is arranged in the flue 101, and the high-temperature flue gas circulates in the flue 101. The fluid medium with a lower temperature enters the heat exchange tube 20 through the first port 102. The high-temperature flue gas and the fluid medium in the heat exchange tube 20 are heat-exchanged to heat the circulating medium in the heat exchange tube 20, and the heated fluid medium can be output from the second port 103. The heat exchange tube 20 adopts a single tube bent into a tortuous structure to form a plurality of heat exchange tube sections connected in series. In this way, the length of the heat exchange tube 20 can be extended as much as possible in a limited space, the heat exchange area can be increased, and the heat exchange efficiency can be improved. It should be noted that there are many specific forms of the tortuous heat exchange tube 20, including but not limited to a serpentine tube structure, a spiral tube structure, etc. For example, the heat exchange tube 20 can be a serpentine tube that tortuously ...

[0038] In addition, the multiple heat exchange tube sections of the heat exchange tube 20 can be arranged into a single-layer tube structure or a multi-layer tube structure. Optionally, the multiple heat exchange tube sections of the heat exchange tube 20 are arranged into at least a two-layer tube structure, which can further extend the length of the heat exchange tube 20, increase the heat exchange area, and improve the heat exchange efficiency. In order to further increase the heat exchange area of ​​the heat exchange tube 20, the heat exchange tube 20 can optionally use a corrugated tube. In some embodiments, fins can also be provided on the periphery of the heat exchange tube 20. The two ends of the heat exchange tube 20 (that is, the input end and the output end of the heat exchange tube 20) are respectively assembled and connected to the shell 10 by a non-welding method. The non-welding method here includes but is not limited to the use of fasteners, clamping, riveting, etc., which are not specifically limited here.

[0039] The technical solution of the utility model can extend the length of the heat exchange tube 20 as much as possible within a limited space by bending the heat exchange tube 20 of the condensing heat exchanger 100 into a tortuous structure using a single tube, thereby increasing the heat exchange area and improving the heat exchange efficiency. Compared with the traditional condensing heat exchanger 100 that uses multiple tubes brazed in parallel to form the heat exchange tube 20, the heat exchange tube 20 in the technical solution uses a single tube to bend to form multiple heat exchange tube sections connected in series. The entire heat exchange tube 20 has only one inlet and one outlet, and the structure is simpler, which can reduce the difficulty of processing and reduce costs; and because the various tube sections of the heat exchange tube 20 do not need to be connected by welding, the two ends of the heat exchange tube 20 are respectively assembled and connected to the shell 10 by non-welding methods, so that the water leakage points formed by welding can be avoided, thereby improving the sealing reliability and reducing the leakage risk of the fluid medium in the heat exchange tube 20.

[0040] Please refer to Figures 1 to 3 In one embodiment, the shell 10 includes a shell body 11, and a first joint 12 and a second joint 13 provided on the shell body 11, the flue 101 is formed inside the shell body 11, the first joint 12 is provided with the first port 102, the second joint 13 is provided with the second port 103, the input end of the heat exchange tube 20 is detachably connected to the first joint 12, and the output end of the heat exchange tube 20 is detachably connected to the second joint 13.

[0041] In this embodiment, the heat exchange tube 20 can be conveniently connected to the external pipeline through the first joint 12 and the second joint 13. Among them, the first joint 12 and the second joint 13 can be assembled and connected to the shell body 11 as independent components, or the first joint 12 and the second joint 13 can also be integrally formed on the shell body 11. In addition, when the first joint 12 and the second joint 13 are independent components relative to the shell body 11, the first joint 12 and the second joint 13 can be independently arranged or can also be connected as a whole. Optionally, the first joint 12 and the second joint 13 are arranged on the same side of the shell 10, and when the condensing heat exchanger 100 is connected to the external pipeline, the external pipeline can be arranged on the same side of the condensing heat exchanger 100, so that the same side space of the condensing heat exchanger 100 is fully utilized. For example, when the condensing heat exchanger 100 is used for gas equipment, the first joint 12 can be used as a water inlet joint to communicate with the water outlet end of the cold water inlet pipe 500, and the second joint 13 can be used as a water outlet joint to communicate with the water inlet pipe of the primary heat exchanger 400. The heat exchange tube 20 is detachably connected to the first joint 12 and the second joint 13, respectively. Thus, when the heat exchange tube 20 is damaged, the heat exchange tube 20 can be conveniently removed for repair or replacement without replacing the entire condensing heat exchanger 100, thereby reducing the repair cost of the condensing heat exchanger 100. The detachable connection method between the heat exchange tube 20 and the first joint 12 and the second joint 13 includes, but is not limited to, connection and fixation by fastener connection, latch connection, snap connection, and the like.

[0042] In order to further simplify the assembly structure of the heat exchange tube 20 and the shell 10, as shown in FIG. Figure 3 As shown, in one embodiment, the heat exchange tube 20 is respectively locked and fixed with the first joint 12 and the second joint 13 by threaded connectors 30. Taking the connection between the heat exchange tube 20 and the first joint 12 as an example, the first joint 12 has a connection end, and the outer peripheral surface of the connection end is provided with an external thread. The input end of the heat exchange tube 20 and the outer peripheral surface of the connection end of the first joint 12 are provided with a threaded connector 30 (such as a connecting nut). The two are locked and fixed by the threaded connector 30, thereby realizing the connection and fixation of the heat exchange tube 20 and the first joint 12. The assembly structure is simple and easy to disassemble and install. The output end of the heat exchange tube 20 and the second joint 13 can also be connected with the above structure, which will not be repeated here.

[0043] Please combine Figure 1 and Figure 2In one embodiment, the shell body 11 includes a water collecting tray 111 with an open top, and a cover body 112 covering the top of the water collecting tray 111, the cover body 112 and the water collecting tray 111 are arranged to form the flue 101, the water collecting tray 111 is provided with a smoke inlet 104 and a drain outlet 105, the cover body 112 is provided with a smoke exhaust outlet 106, and the smoke inlet 104, the drain outlet 105 and the smoke exhaust outlet 106 are respectively connected to the flue 101.

[0044] In this embodiment, the side wall of the water collecting tray 111 is provided with a first joint 12 and a second joint 13, the bottom wall of the water collecting tray 111 is provided with a smoke inlet 104 and a drain outlet 105, the cover body 112 is provided with a smoke exhaust outlet 106, and the water collecting tray 111 and the cover body 112 are enclosed to form a flue 101. High-temperature flue gas enters the flue 101 from the smoke inlet 104, and the high-temperature flue gas is discharged from the smoke exhaust outlet 106 after heat exchange with the heat exchange tube 20. During the heat exchange process, the high-temperature flue gas contacts the surface of the heat exchange tube 20, and condensed water is generated on the surface of the heat exchange tube 20, and the condensed water drips into the water collecting tray 111 and is discharged from the drain outlet 105. Optionally, the cover body 112 is provided with a smoke exhaust pipe that passes through from top to bottom, and the upper end of the smoke exhaust pipe forms the smoke exhaust outlet 106.

[0045] The water collecting pan of a traditional condensing heat exchanger is generally formed by splicing multiple sheet metal parts, which has a complex structure and needs to be connected by brazing. The processing cost is high, and there are many welding leakage points and poor sealing reliability. In this embodiment, the water collecting pan 111 adopts an integrally formed structure. For example, the water collecting pan 111 is formed by integrally stretching sheet metal parts. The structure is simple and no brazing is required. The processing difficulty and processing cost can be reduced, the sealing reliability is improved, and the risk of leakage is reduced. Optionally, the cover body 112 adopts an integrally formed structure. For example, the cover body 112 is formed by integrally stretching sheet metal parts. The structure is simple and easy to process. In addition, the water collecting pan 111 and the cover body 112 can be assembled and connected by screw connection or riveting.

[0046] In order to facilitate the installation of the condensing heat exchanger 100, as Figure 2 As shown, in one embodiment, the condensing heat exchanger 100 further includes a connection seat 50 disposed at the bottom of the shell 10, the connection seat 50 is provided with a cavity open downward, and the top wall of the connection seat 50 is provided with a smoke outlet connecting the cavity with the smoke inlet 104. In this embodiment, the connection seat 50 includes but is not limited to being assembled to the bottom of the shell 10 (i.e., the bottom of the water collecting tray 111) by welding, riveting, fastener connection, etc. In actual use, the connection seat 50 can be covered on the top of the primary heat exchanger 400 of the gas equipment to form a sealed connection. After the primary heat exchange, the flue gas flows upward to the cavity of the connection seat 50 and then enters the flue 101 of the condensing heat exchanger 100 through the smoke outlet and the smoke inlet 104.

[0047] Please combine Figure 2 and Figure 3 In one embodiment, the heat exchange tube 20 includes a plurality of heat exchange tube segments and a plurality of bent tube segments connecting the plurality of heat exchange tube segments in series, the extension direction of each of the heat exchange tube segments intersects with the flue gas outflow direction of the flue 101, and the plurality of heat exchange tube segments are arranged into at least two layers along the flue gas outflow direction of the flue 101.

[0048] In this embodiment, a plurality of heat exchange pipe sections are extended in parallel, and in the direction of water flow, the ends of two adjacent heat exchange pipe sections are connected by a bent pipe section, so that the heat exchange pipe 20 as a whole has a tortuous structure. For example, the shell 10 has a first side wall 11a and a second side wall 11b that are opposite and spaced apart in a first direction, and a third side wall and a fourth side wall that are opposite and spaced apart in a second direction, and each heat exchange pipe section is extended between the third side wall and the fourth side wall. A plurality of heat exchange pipe sections are arranged in at least two layers of pipe structures along the flue gas outflow direction of the flue 101, so that the length of the heat exchange pipe 20 can be extended as much as possible within the limited space of the flue 101, and the heat exchange area can be increased, so that the high-temperature flue gas can fully contact the heat exchange pipe 20 for heat exchange, thereby improving the heat exchange efficiency. Optionally, the adjacent two layers of heat exchange tube sections are staggered so that each layer of heat exchange tube sections can fully contact and exchange heat with the high-temperature flue gas, and can ensure that the condensed water generated on the surface of the heat exchange tube sections in the upper layer will not be blocked by the heat exchange tube sections in the lower layer when dripping downward, and can smoothly drip into the water collection tray 111. The first direction can be the width direction of the shell 10, the second direction can be the length direction of the shell 10, and the flue gas outflow direction of the flue 101 can be the height direction of the shell 10.

[0049] Usually, the number of bends of a single heat exchange tube 20 should not be too many, otherwise it will increase the water flow resistance in the heat exchange tube 20, resulting in a smaller water outlet. Optionally, the number of bends of the heat exchange tube 20 does not exceed six times, that is, the number of bends of the heat exchange tube 20 is less than or equal to 6. Exemplarily, the heat exchange tube 20 may include 6 heat exchange tube segments and 5 bend tube segments. In the direction of water flow, the same end of any two adjacent heat exchange tube segments is connected in series through a bend tube segment. Optionally, the 6 heat exchange tube segments are arranged in two layers in the direction of flue gas outflow, and each layer includes three heat exchange tube segments arranged side by side. Optionally, the heat exchange tube segments located in the upper layer and the heat exchange tube segments located in the lower layer are staggered in the first direction.

[0050] In one embodiment, the inner diameter of the heat exchange tube 20 is not less than 12 cm and not more than 20 cm. That is, the inner diameter of the heat exchange tube 20 is between 12 cm and 20 cm. For example, the inner diameter of the heat exchange tube 20 can be 12 cm, 13 cm, 14 cm, 15 cm, 16 cm, 17 cm, 18 cm, 19 cm, 20 cm, etc. The inner diameter of the heat exchange tube 20 is moderate, and the water flow resistance in the heat exchange tube 20 is moderate, which is conducive to achieving sufficient heat exchange while ensuring the water flow rate. In addition, the inner diameter of the traditional parallel heat exchange tube is generally 12 cm. Compared with the heat exchange tube formed by connecting multiple tubes in parallel, the heat exchange tube 20 in the present technical solution adopts a single tube in series, so that the overall length of the heat exchange tube 20 is shortened. In order to make up for the problem of insufficient heat exchange area caused by the shortened pipeline, the inner diameter of the heat exchange tube 20 is optionally greater than 12 cm, which is equivalent to enlarging the inner diameter of the heat exchange tube 20, so as to make up for the insufficient heat exchange area caused by the shortened pipeline, which is conducive to ensuring the heat exchange efficiency. Optionally, the inner diameter of the heat exchange tube 20 is less than 20 cm, so that the inner diameter of the heat exchange tube 20 is not too large, so that the water flow in the middle of the heat exchange tube 20 can also be fully heated. Optionally, the inner diameter of the heat exchange tube 20 is 16 cm, so that the inner diameter of the heat exchange tube 20 is moderate, and a better heat exchange effect can be achieved.

[0051] Based on the above embodiments, Figure 2 As shown, in one embodiment, the condensing heat exchanger 100 also includes a guide member 40 arranged in the shell 10, the guide member 40 divides the flue 101 into a zigzag shape, the bottom wall of the shell 10 is provided with a smoke inlet 104 opposite to the bottom surface of the guide member 40, the top wall of the shell 10 is provided with a smoke exhaust port 106 opposite to the top surface of the guide member 40, the smoke inlet 104 is connected with the smoke exhaust port 106 via the flue 101, and the heat exchange tube 20 is arranged between the guide member 40 and the bottom wall of the shell 10.

[0052] In this embodiment, by providing a guide member 40 in the housing 10, the flue 101 is divided into a zigzag structure by the guide member 40, so that the length of the flue 101 can be extended within a limited space, and the retention time of the high-temperature flue gas in the flue 101 can be extended, so as to achieve sufficient heat exchange between the high-temperature flue gas and the heat exchange tube 20, and improve the heat exchange efficiency. The guide member 40 and the housing 10 can be connected and fixed by an assembly structure, or the guide member 40 can also be integrally formed with the housing 10. Specifically, the guide 40 is located between the bottom wall and the top wall of the shell 10, and the guide 40 divides the flue 101 into a lower flue and an upper flue that are interconnected, wherein the lower flue is formed between the guide 40 and the bottom wall of the shell 10, and the upper flue is formed between the guide 40 and the top wall of the shell 10, and the heat exchange tube 20 is located in the lower flue, and the bottom wall of the shell 10 is provided with a smoke inlet 104 connected to the lower flue, and the top wall of the shell 10 is provided with a smoke outlet 106 connected to the upper flue. In this way, the high-temperature flue gas enters the lower flue through the smoke inlet 104, fully exchanges heat with the heat exchange tube 20, and then flows to the upper flue, and finally is discharged from the smoke outlet 106. In a specific embodiment, the shell 10 includes a water collecting tray 111 and a cover body 112 covering the top of the water collecting tray 111. Accordingly, the bottom wall of the water collecting tray 111 is the bottom wall of the shell 10, and the top wall of the cover body 112 is the top wall of the shell 10.

[0053] It is understandable that the high-temperature flue gas flows upward from the smoke inlet 104 into the flue 101. When the flue gas contacts the guide member 40, the flow direction will be changed, and the flue gas will flow along the extension direction of the guide member 40. At this time, most of the flue gas gathers at the top position of the heat exchange tube 20 (that is, the position of the heat exchange tube 20 close to the guide member 40), so that the bottom position of the heat exchange tube 20 is not in sufficient contact with the flue gas, resulting in uneven heat exchange of the heat exchange tube 20 as a whole. In particular, when multiple heat exchange tube sections of the heat exchange tube 20 are arranged into a multi-layer tube structure, most of the flue gas gathers at the upper heat exchange tube section position, while the heat exchange tube section located at the lower layer is not in sufficient contact with the flue gas, resulting in uneven heat exchange between the upper heat exchange tube section and the lower heat exchange tube section, affecting the heat exchange efficiency.

[0054] In order to improve the overall heat transfer uniformity of the heat exchange tube 20, Figure 2As shown, in one embodiment, the guide member 40 includes a guide portion 411 opposite to the smoke inlet 104, and the guide portion 411 is used to guide the smoke flowing in from the smoke inlet 104 to flow toward the bottom of the heat exchange tube 20 after swirling at a preset angle. In this way, the high-temperature smoke flows upward from the smoke inlet 104 to the guide portion 411, and the high-temperature smoke can flow from top to bottom toward the bottom of the heat exchange tube 20 after swirling at a preset angle through the guide portion 411, so that the top and bottom of the heat exchange tube 20 can fully contact with the smoke for heat exchange, thereby improving the overall heat exchange uniformity of the heat exchange tube 20. For example, in this embodiment, the heat exchange tube 20 includes a plurality of heat exchange tube segments, and the plurality of heat exchange tube segments are arranged in two layers between the guide member 40 and the bottom wall of the shell 10. Through the guiding effect of the guide portion 411, the high-temperature smoke can flow toward the heat exchange tube segment of the lower layer after swirling, so that both the upper and lower heat exchange tube segments can achieve sufficient heat exchange with the high-temperature smoke. There are many specific structures of the guide portion 411, including but not limited to guide grooves, guide ribs, guide blades, etc., which are not specifically limited here.

[0055] like Figure 2 As shown, in one embodiment, the shell 10 has a first side wall 11a and a second side wall 11b opposite to each other, the guide member 40 includes a first guide plate 41 and a second guide plate 42 connected to each other, the first guide plate 41 is arranged adjacent to the first side wall 11a, the second guide plate 42 extends from the side edge of the first guide plate 41 toward the second side wall 11b and is arranged downwardly inclined, a gap is formed between the second guide plate 42 and the second side wall 11b, the smoke inlet 104 is arranged opposite to the first guide plate 41, the guide portion 411 is arranged on the first guide plate 41, and the heat exchange tube 20 is located between the second guide plate 42 and the bottom wall of the shell 10.

[0056] In this embodiment, the housing 10 has a first side wall 11a and a second side wall 11b opposite to each other. For example, the first side wall 11a and the second side wall 11b can be two side walls in the width direction of the housing 10. The first guide plate 41 and the smoke inlet 104 are both arranged adjacent to the first side wall 11a. The first guide plate 41 is located above the smoke inlet 104, and the second guide plate 42 is located above the heat exchange tube 20. The high-temperature flue gas enters the flue 101 from the smoke inlet 104 and flows upward. After being guided by the guide portion 411 on the first guide plate 41, it turns back and forth at a preset angle and flows downward toward the bottom of the heat exchange tube 20. Then, the high-temperature flue gas can flow from the first side wall 11a to the second side wall 11b through the guiding effect of the second guide plate 42, so as to fully contact and exchange heat with the heat exchange tube 20. The flue gas after heat exchange then flows upward through the gap between the second side wall 11b and the second guide plate 42, and finally is discharged from the exhaust port 106 at the top of the housing 10. The first guide plate 41 and the second guide plate 42 cooperate to guide the flue gas, which is beneficial for the heat exchange tube 20 to fully contact and exchange heat with the flue gas. In addition, when the high-temperature flue gas contacts the second guide plate 42, condensed water will also be generated on the surface of the second guide plate 42. By setting the second guide plate 42 in an inclined state, the condensed water attached to the surface of the second guide plate 42 can slide down along the second guide plate 42 to the bottom of the shell 10 and then be discharged in time from the drain port 105.

[0057] like Figure 2 As shown, in one embodiment, the first guide plate 41 is arched relative to the second guide plate 42 toward a side away from the smoke inlet 104 , and the first guide plate 41 is surrounded to form a groove facing the smoke inlet 104 , and the groove forms the guide portion 411 .

[0058] In this embodiment, the second guide plate 42 is arranged in the shape of an arc plate that arches toward the side away from the smoke inlet 104, so that the guide portion 411 is a U-shaped groove structure, and the arc-shaped inner wall surface of the groove can play a good role in guiding the smoke. In addition, the guide portion 411 is arranged as a groove, which has a simple structure, is easy to process and form, and can save processing costs. Optionally, the first guide plate 41 and the second guide plate 42 are an integrally formed structure. For example, the first guide plate 41 and the second guide plate 42 can be formed by integrally bending a sheet metal part, which can simplify the processing technology and reduce the processing cost.

[0059] It is worth noting that, in this embodiment, the first guide plate 41 is arched relative to the second guide plate 42 toward the side away from the smoke inlet 104, so that the portion where the first guide plate 41 and the second guide plate 42 meet forms a corner, that is, the inner wall surface of the groove formed by the first guide plate 41 is not tangent to the lower plate surface of the second guide plate 42. The advantage of this structural design is that after the smoke entering from the smoke inlet 104 flows upward and touches the inner wall surface of the groove, it can turn around along the inner wall surface of the groove at a preset angle and then flow downward at a certain angle relative to the second guide plate 42 toward the bottom of the heat exchange tube 20, which can prevent a large amount of smoke from flowing along the lower plate surface of the second guide plate 42, so that both the upper heat exchange tube section and the lower heat exchange tube section can fully contact with the smoke for heat exchange, further improving the uniformity of heat exchange.

[0060] Alternatively, if Figure 2 As shown, the first guide plate 41 and the second guide plate 42 are connected to form a corner, and the outer section of the first guide plate 41 near the corner forms an angle α with the upper plate surface of the first guide plate 41, wherein α is not less than 80° and not greater than 130°. That is, 80°≤α≤130°, so that the angle of the corner where the first guide plate 41 and the second guide plate 42 are connected is moderate, which is conducive to improving the flue gas flow field, making the flue gas distribution more uniform, and improving the overall heat exchange uniformity of the heat exchange tube 20. For example, α can be 80°, 90°, 100°, 110°, 120°, 130°, etc.

[0061] The utility model also provides a gas device, which includes a condensing heat exchanger 100. The specific structure of the condensing heat exchanger 100 refers to the above embodiment. Since the gas device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the gas device includes but is not limited to a gas water heater, a gas hot water heating furnace, etc.

[0062] For example, Figure 4As shown, in one embodiment, the gas device is a gas water heater, specifically a strong drum type condensing gas water heater, and the gas device includes a fan 200, a burner 300, a primary heat exchanger 400 and a condensing heat exchanger 100 arranged in sequence from bottom to top. Among them, the air outlet of the fan 200 is connected with the burner 300, the first port 102 of the condensing heat exchanger 100 can be used as a water inlet to be connected with the water outlet end of the cold water inlet pipe 500, the second port 103 of the condensing heat exchanger 100 can be used as a water outlet to be connected with the water inlet end of the primary heat exchanger 400, and the water outlet end of the primary heat exchanger 400 is connected with the water inlet end of the hot water outlet pipe 600. The burner 300 burns to generate high-temperature flue gas, which can be driven by the fan 200 to flow upward, and the high-temperature flue gas enters the condensing heat exchanger 100 for secondary heat exchange after heat exchange in the primary heat exchanger 400, so that the latent heat in the flue gas can be fully utilized to improve the efficiency of the whole machine. Furthermore, when the gas water heater is working, the cold water in the cold water inlet pipe 500 can be first transported to the heat exchange pipe 20 of the condensing heat exchanger 100 for preheating, and then transported to the primary heat exchanger 400 for heating, which can improve the heating efficiency and achieve rapid hot water output. Of course, in some embodiments, the gas equipment can also be a strong extraction type condensing gas water heater, in which case the fan 200 can be arranged on the top of the condensing heat exchanger 100.

[0063] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A condensing heat exchanger, characterized in that: include: A shell body, a flue is formed inside, and the shell body is provided with a first port and a second port; as well as A heat exchange tube is arranged in the flue, and the heat exchange tube is formed by bending a single tube into a tortuous structure. Both ends of the heat exchange tube are respectively assembled and connected to the shell in a non-welding manner, the input end of the heat exchange tube is connected to the first port, and the output end of the heat exchange tube is connected to the second port.

2. The condensing heat exchanger according to claim 1, characterized in that: The shell includes a shell body, and a first joint and a second joint arranged on the shell body. The flue is formed inside the shell body. The first joint is provided with the first port, and the second joint is provided with the second port. The input end of the heat exchange tube is detachably connected to the first joint, and the output end of the heat exchange tube is detachably connected to the second joint.

3. The condensing heat exchanger according to claim 2, characterized in that: The heat exchange tube is respectively locked and fixed to the first joint and the second joint through threaded connectors.

4. The condensing heat exchanger according to claim 2, characterized in that: The shell body includes a water collecting tray with an open top, and a cover body covered on the top of the water collecting tray, the cover body and the water collecting tray are arranged to form the flue, the water collecting tray is provided with a smoke inlet and a drain outlet, the cover body is provided with a smoke exhaust outlet, the smoke inlet, the drain outlet and the smoke exhaust outlet are respectively connected to the flue, and the water collecting tray adopts an integrally formed structure.

5. The condensing heat exchanger according to claim 1, characterized in that: The heat exchange tube comprises a plurality of heat exchange tube segments and a plurality of bent tube segments connected in series, the extension direction of each heat exchange tube segment intersects with the flue gas outflow direction of the flue, and the plurality of heat exchange tube segments are arranged in at least two layers along the flue gas outflow direction of the flue; And / or, the inner diameter of the heat exchange tube is not less than 12 cm and not more than 20 cm.

6. The condensing heat exchanger according to any one of claims 1 to 5, characterized in that: The condensing heat exchanger also includes a guide member arranged in the shell, the guide member divides the flue into a zigzag shape, the bottom wall of the shell is provided with a smoke inlet opposite to the bottom surface of the guide member, the top wall of the shell is provided with a smoke exhaust port opposite to the top surface of the guide member, the smoke inlet is connected with the smoke exhaust port via the flue, and the heat exchange pipe is arranged between the guide member and the bottom wall of the shell.

7. The condensing heat exchanger according to claim 6, characterized in that: The guide member includes a guide portion opposite to the smoke inlet, and the guide portion is used to guide the smoke flowing in from the smoke inlet to swirl around a preset angle and then flow toward the bottom of the heat exchange tube.

8. The condensing heat exchanger according to claim 7, characterized in that: The shell has a first side wall and a second side wall opposite to each other, the guide member includes a first guide plate and a second guide plate connected to each other, the first guide plate is arranged adjacent to the first side wall, the second guide plate extends from the side edge of the first guide plate toward the second side wall and is arranged downwardly inclined, a gap is formed between the second guide plate and the second side wall, the smoke inlet is arranged opposite to the first guide plate, the guide portion is arranged on the first guide plate, and the heat exchange tube is located between the second guide plate and the bottom wall of the shell.

9. The condensing heat exchanger according to claim 8, characterized in that: The first guide plate is arched relative to the second guide plate toward a side away from the smoke inlet, and the first guide plate is surrounded to form a groove facing the smoke inlet, and the groove forms the guide portion.

10. The condensing heat exchanger according to claim 9, characterized in that: A corner is formed at the junction of the first guide plate and the second guide plate, and an angle α is formed between the outer section of the first guide plate near the corner and the upper plate surface of the first guide plate, wherein α is not less than 80° and not more than 130°.

11. A gas equipment, characterized in that: It comprises the condensing heat exchanger as claimed in any one of claims 1 to 10.

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