Condensation heat exchanger

Abstract

The utility model belongs to the technical field of heat exchange equipment, and particularly relates to a condensation heat exchanger which comprises a main shell with a heat exchange cavity, a smoke outlet and a smoke inlet are formed in the main shell, a plurality of heat absorption pipes are horizontally and transversely distributed in the heat exchange cavity, and the main shell comprises a middle shell. A left end cover and a rear end cover are arranged at a left port and a right port of the middle shell in a covering mode respectively, annular connecting parts are arranged on the outer edges of the left end cover and the right end cover, the outer side walls of the annular connecting parts are attached to the inner cylinder wall of the middle shell, the annular connecting parts and the inner cylinder wall of the middle shell are fixed through hot melting welding, and the heat absorption pipe is arranged between the left end cover and the right end cover. The two ports of the middle shell are respectively fixed with the left end cover and the right end cover in a hot welding mode, meanwhile, the hot welding area of the middle shell and the left end cover and the right end cover is effectively increased by means of the annular connecting parts, existing manual electric welding operation is replaced, the welding efficiency is high, meanwhile, overall connection is reliable and firm, and the sealing performance is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchange equipment technical field, especially point to a condensing heat exchanger. BACKGROUND

[0002] The gas wall -hanging stove is usually equipped with the corresponding device such as combustion chamber, heat exchanger, the combustion chamber burns gas and produces a large amount of heat, and the heat is transferred to the cold water flowing through the heat exchanger by the heat exchanger, so that the water temperature of the cold water is raised to form hot water discharged from the water outlet pipe, and the high-temperature flue gas generated by combustion will also pass through a set of flue gas secondary condensing heat exchanger, and the heat in the flue gas is recovered by the secondary condensing heat exchanger to preheat the water flow, effectively improving the heat exchange rate of the gas wall-hanging stove.

[0003] The shell of the existing condensing heat exchanger is mostly formed into a box structure by artificial electric welding, which not only has low welding efficiency, is time-consuming and laborious, but also the shell welded by artificial electric welding is prone to gaps and has the defect of smoke leakage. SUMMARY

[0004] The utility model discloses a condensing heat exchanger, wherein the two ports of the shell are fixed with the left end cover and the right end cover by hot welding, and the hot welding area of the middle shell with the left end cover and the right end cover is effectively increased by the annular connecting part, which not only replaces the existing artificial electric welding operation, has high welding efficiency, and has reliable, firm and high sealing overall connection.

[0005] The utility model is realized as follows:

[0006] A condensing heat exchanger, comprising a main shell body with a heat exchange chamber, a flue gas outlet and a flue gas inlet are formed on the main shell body and communicated with the heat exchange chamber, a plurality of heat absorption pipes are distributed horizontally and transversely in the heat exchange chamber, adjacent heat absorption pipes are communicated by water passing channels and form a serpentine water flow channel, the first and last ends of the water flow channel are respectively an inlet port and an outlet port formed on the main shell body, the main shell body comprises a middle shell which is horizontally arranged and has a cylindrical structure, a left end cover and a right end cover are respectively arranged at the left and right ports of the middle shell, the outer edges of the left end cover and the right end cover are both provided with annular connecting parts, the outer side wall of the annular connecting part is matched with the inner cylinder wall of the middle shell and they are fixed by hot melting welding, the heat absorption pipes are arranged between the left end cover and the right end cover, the inlet port is formed on the left end cover or the right end cover, and the outlet port is formed on the left end cover or the right end cover.

[0007] In the condensing heat exchanger, the left end cover and the right end cover each comprise an inner cover body arranged at a corresponding port of the middle shell and an outer cover body arranged on an outer wall surface of the inner cover body, a plurality of plug-in through holes for inserting corresponding ends of the heat absorbing pipes are arranged on the inner cover body, the water passing channel is formed between the inner cover body and the outer cover body, and the annular connecting part is formed by extending the outer edge of the inner cover body outward along the axial direction of the middle shell.

[0008] In the condensing heat exchanger, the outer cover body is fixed on the inner cover body through fastening screws.

[0009] In the condensing heat exchanger, the inner wall surface of the plug-in through hole is extended outward along the axial direction to form an extended assembly part.

[0010] In the condensing heat exchanger, the annular connecting part of the left end cover extends outward beyond the middle shell and is bent to form a vertically arranged connecting plate part, more than three connecting plate parts are circumferentially distributed around the annular connecting part, and an assembly strip hole is arranged on each connecting plate part, and the water inlet port and the water outlet port are arranged on the right end cover.

[0011] In the condensing heat exchanger, the flue gas inlet is arranged on the side wall of the middle shell, the flue gas outlet is arranged on the top surface of the middle shell, a smoke guide plate body is arranged in the heat exchange chamber above the inner side of the flue gas inlet, the smoke guide plate body is located between the flue gas inlet and the heat absorbing pipe, and the smoke guide plate body can guide the flue gas to flow downward.

[0012] In the condensing heat exchanger, the smoke guide plate body has an inverted J-shaped structure, a fixed through hole is arranged at the short axis end of the smoke guide plate body, the inner wall surface of the middle shell is recessed inward to form a fixed protrusion arranged in the fixed through hole, and the long axis end of the smoke guide plate body is arranged vertically, and the horizontal height of the lowest point of the long axis end is less than or equal to the horizontal height of the highest point of the flue gas inlet.

[0013] In the condensing heat exchanger, the inner bottom surface of the middle shell in the heat exchange chamber is recessed downward to form a water collecting groove, and a drainage channel communicating with the outside is arranged on the water collecting groove.

[0014] Compared with the prior art, the condensing heat exchanger has the following advantages:

[0015] In the condensing heat exchanger, the two ports of the middle shell are fixed with the left end cover and the right end cover through heat welding, and the annular connecting part effectively increases the heat welding area of the middle shell, the left end cover and the right end cover, which not only replaces the manual electric welding operation, but also has high welding efficiency, reliable and firm overall connection and high sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall three-dimensional structure of the condensing heat exchanger Figure One ;

[0017] Figure 2 is the whole three-dimensional Figure Two of the utility model

[0018] Figure 3 is the whole sectional view Figure One of the utility model

[0019] Figure 4 is the whole sectional view Figure Two of the utility model

[0020] In the figure: 1, flue gas outlet; 2, flue gas inlet; 3, heat absorption pipe; 4, water passage; 5, water inlet port; 6, water outlet port; 7, middle shell; 8, left end cover; 9, right end cover; 10, annular connecting part; 11, inner cover body; 12, outer cover body; 13, lengthened assembly part; 14, connecting plate part; 15, assembly strip hole; 16, smoke guide plate body; 17, fixing protrusion; 18, water collecting groove. DETAILED DESCRIPTION

[0021] The utility model will be further described below with specific embodiments, referring to Figure 1 -4:

[0022] A condensing heat exchanger, including the main casing with the heat exchange chamber, is provided with flue gas outlet 1 and flue gas inlet 2 with the heat exchange chamber on the main casing, and a plurality of heat absorption pipes 3 are distributed in the heat exchange chamber along the horizontal transverse direction, and adjacent heat absorption pipes 3 are communicated through water passage 4 and form the serpentine water flow channel, and the first and tail ends of the water flow channel are water inlet port 5 and water outlet port 6 provided on the main casing respectively, and the main casing includes the middle shell 7 that is horizontally arranged and is in the form of a cylinder, and the left and right ends of the middle shell 7 are covered with left end cover 8 and rear end cover respectively, and the outer edges of left end cover 8 and right end cover 9 are provided with annular connecting part 10, and the outer side wall of annular connecting part 10 is attached to the inner cylinder wall of middle shell 7 and is fixed by heat fusion welding, and heat absorption pipe 3 is arranged between left end cover 8 and right end cover 9, and water inlet port 5 is provided on left end cover 8 or right end cover 9, and water outlet port 6 is provided on left end cover 8 or right end cover 9.

[0023] The two ports of the middle shell 7 in the utility model are fixed with left end cover 8 and right end cover 9 by heat welding, and the heat welding area of the middle shell 7 and left end cover 8 and right end cover 9 is effectively increased by means of annular connecting part 10, which not only replaces the present human welding operation, but also has high welding efficiency, and the overall connection is reliable, firm and has high sealing performance.

[0024] The water passing channel 4 can be formed by the inner hole of the pipe, and in the embodiment, the left end cover 8 and the right end cover 9 each include an inner cover body 11 arranged at the corresponding port of the middle shell 7 and an outer cover body 12 arranged on the outer wall surface of the inner cover body 11, a plurality of insertion holes are arranged on the inner cover body 11 for the corresponding end of the heat absorbing pipe 3 to be inserted, the water passing channel 4 is formed between the inner cover body 11 and the outer cover body 12, and the annular connecting portion 10 is formed by the outer edge of the inner cover body 11 extending outward along the axial direction of the middle shell 7.

[0025] Further, the outer cover body 12 is fixed on the inner cover body 11 by fastening screws.

[0026] Furthermore, in order to improve the stability of the end of the heat absorbing pipe 3 connected to the corresponding inner cover body 11, the inner wall surface of the insertion hole is formed with an extended assembly portion 13 extending outward along the axial direction.

[0027] Meanwhile, the annular connecting portion 10 of the left end cover 8 extends outward beyond the middle shell 7 and is bent to form a vertically arranged connecting plate portion 14, the connecting plate portion 14 is circumferentially distributed around the annular connecting portion 10 and is provided with three or more assembly strip holes 15, and each assembly strip hole 15 is arranged on the outer wall surface by being penetrated by a fastener, and the water inlet port 5 and the water outlet port 6 are arranged on the right end cover 9.

[0028] In order to prolong the flow path of the flue gas in the heat exchange chamber, the flue gas inlet 2 is arranged on the side wall of the middle shell 7, the flue gas outlet 1 is arranged on the top surface of the middle shell 7, and a smoke guide plate body 16 is arranged in the heat exchange chamber above the inner side of the flue gas inlet 2, the smoke guide plate body 16 is located between the flue gas inlet 2 and the heat absorbing pipe 3 and can guide the flue gas to flow downward.

[0029] Furthermore, in the embodiment, the smoke guide plate body 16 has an inverted J-shaped structure, a fixed through hole is arranged at the short axis end of the smoke guide plate body 16, a fixed protrusion 17 is formed on the inner wall surface of the middle shell 7 and is inserted into the fixed through hole, the long axis end of the smoke guide plate body 16 is arranged vertically, and the horizontal height of the lowest point of the long axis end is less than or equal to the horizontal height of the highest point of the flue gas inlet 2.

[0030] In addition, the inner bottom surface of the middle shell 7 in the heat exchange chamber is recessed downward to form a water collecting groove 18, and a drainage channel is arranged on the water collecting groove 18 and is connected to the outside.

[0031] The above embodiment is only one of the preferred embodiments of the present application, and does not limit the scope of the present application, so that: any equivalent changes made according to the shape, structure and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A condensing heat exchanger, comprising a main shell having a heat exchange chamber, wherein a flue gas outlet (1) and a flue gas inlet (2) communicating with the heat exchange chamber are provided on the main shell, and a plurality of heat-absorbing tubes (3) are distributed horizontally in the heat exchange chamber, and adjacent heat-absorbing tubes (3) are connected by a water passage (4) to form a serpentine water flow channel, wherein the first and last ends of the water flow channel are respectively a water inlet (5) and a water outlet (6) provided on the main shell, characterized in that: The main shell includes a middle shell (7) that is horizontally arranged and has a cylindrical structure. The left end cover (8) and the rear end cover are respectively covered at the left and right ends of the middle shell (7). The outer edges of the left end cover (8) and the right end cover (9) are both provided with annular connecting parts (10). The outer side wall of the annular connecting parts (10) is attached to the inner wall of the middle shell (7) and the two are fixed by hot melt welding. The heat absorption tube (3) is arranged between the left end cover (8) and the right end cover (9). The water inlet port (5) is opened on the left end cover (8) or the right end cover (9). The water outlet port (6) is opened on the left end cover (8) or the right end cover (9).

2. A condensing heat exchanger according to claim 1, characterized in that: The left end cover (8) and the right end cover (9) each include an inner cover (11) covering the corresponding port of the middle shell (7) and an outer cover (12) covering the outer wall of the inner cover (11). The inner cover (11) has a plurality of insertion holes for the corresponding ends of the heat absorption tube (3) to be inserted. The water passage (4) is formed between the inner cover (11) and the outer cover (12). The annular connecting part (10) is formed by extending outward from the outer edge of the inner cover (11) along the axial direction of the middle shell (7).

3. A condensing heat exchanger according to claim 2, characterized in that: The outer cover (12) is fixed to the inner cover (11) by fastening screws.

4. A condensing heat exchanger according to claim 2, characterized in that: The inner wall surface of the insertion through hole extends outward along its axial direction to form an extended assembly part (13).

5. A condensing heat exchanger according to claim 1 or 2, characterized in that: The annular connecting part (10) of the left end cover (8) extends beyond the middle shell (7) and bends outward to form a connecting plate part (14) arranged vertically. The connecting plate part (14) has three or more circumferentially distributed around the annular connecting part (10), and each connecting plate part (14) is provided with an assembly strip hole (15). The water inlet port (5) and the water outlet port (6) are both opened on the right end cover (9).

6. A condensing heat exchanger according to claim 1, characterized in that: The flue gas inlet (2) is located on the side wall of the middle shell (7), and the flue gas outlet (1) is located on the top surface of the middle shell (7). A smoke guide plate (16) is provided in the heat exchange chamber located above the inner side of the flue gas inlet (2). The smoke guide plate (16) is located between the flue gas inlet (2) and the heat absorption tube (3) and can guide the flue gas to flow downward.

7. A condensing heat exchanger according to claim 6, characterized in that: The smoke guide plate (16) has an inverted J-shaped structure. A fixed through hole is provided at the short axis end of the smoke guide plate (16). The inner wall of the middle shell (7) is recessed inward to form a fixed protrusion (17) inserted into the fixed through hole. The long axis end of the smoke guide plate (16) is set vertically and the horizontal height of its lowest point is less than or equal to the horizontal height of the highest point of the flue gas inlet (2).

8. A condensing heat exchanger according to claim 1, characterized in that: A water collection trough (18) is formed by a downward-facing indentation in the inner bottom surface of the middle shell (7) located in the heat exchange chamber, and a drainage channel communicating with the outside is provided on the water collection trough (18).

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