CN107044786B

CN107044786B - Full premix combustion condensing heat exchanger

Info

Publication number: CN107044786B
Application number: CN201710219535.1A
Authority: CN
Inventors: 陈韶舜
Original assignee: Guangdong Roc Cool& Heat Equipment Co ltd
Current assignee: Guangdong Roc Cool& Heat Equipment Co ltd
Priority date: 2017-04-06
Filing date: 2017-04-06
Publication date: 2023-06-16
Anticipated expiration: 2037-04-06
Also published as: CN107044786A

Abstract

The invention discloses a full premix combustion condensing heat exchanger, which comprises a full premix burner, a condensing front cover, a spiral coil, a heat insulation disc, a sealing cylinder, an arc-shaped connecting plate and a condensing rear cover, wherein the arc-shaped connecting plate and the spiral coil are arranged in the sealing cylinder, the arc-shaped connecting plate is positioned at the periphery of the spiral coil, the condensing front cover and the condensing rear cover are arranged at two ends of the sealing cylinder and are respectively connected with two ends of the arc-shaped connecting plate, a water inlet pipe orifice of the spiral coil is communicated with a water inlet of the condensing rear cover, a water outlet pipe orifice of the spiral coil is communicated with a water outlet of the condensing front cover, an upper cover body in the full premix burner is connected with the condensing front cover, the combustion cylinder in the full premix burner penetrates through the condensing front cover to extend into the sealing cylinder, the spiral coil is positioned at the periphery of the combustion cylinder, and the heat insulation disc is arranged in the sealing cylinder and is arranged on the spiral coil. The invention has the characteristics of long service life, energy conservation, safety and reliability.

Description

Full premix combustion condensing heat exchanger

Technical Field

The invention relates to a heat exchanger for supplying hot water and heating, in particular to a full premix combustion condensing heat exchanger taking fuel gas as an energy source.

Background

The patent literature with the publication number 104180510A is disclosed in the state intellectual property office on the 12 th month 3 of 2014, the patent name is a condensing type gas hanging stove, and is characterized by comprising a shell (1), and a main heat exchanger (2), a gas inlet pipe (3), an air inlet pipe (4), a fan assembly (6), a condensing device, a smoke exhaust pipe (10), an expansion tank (14) and a plate type exchanger assembly (15) which are arranged in the shell (1), wherein the gas inlet pipe (3) is provided with a gas proportional valve (13), the air inlet pipe (4) and the gas inlet pipe (3) are connected onto a premixer (25), the premixer (25) is arranged at the inlet of the fan assembly (6), the main heat exchanger (2) comprises a stove core (2 a) and a water channel (2 b) which is arranged on the outer wall of the stove core (2 a) in a spiral ascending mode, the fan assembly (6) is connected to the top of the stove core (2 a), the condensing device is arranged at the bottom of the stove core (2 a), one end of the smoke exhaust pipe (3) is connected with the condensing device (10) and penetrates through the shell (1) and the water inlet (2 d) and is connected with the water inlet (2 d) of the shell (2).

The national intellectual property agency discloses patent literature with publication number 106439810a, patent name being burner and gas water heater having the same, at 2 nd 2017, the burner comprising: the burner comprises a burner frame body, wherein a premixing cavity is defined in the burner frame body, and the burner frame body is provided with a fan interface and a gas interface which are communicated with the premixing cavity; the distributing pieces are arranged in the premixing cavity at intervals along the airflow direction, and each distributing piece is provided with a plurality of distributing holes communicated with the premixing cavity; the gas distribution rod is detachably arranged in the premixing cavity and internally provided with a gas channel, the gas distribution rod is provided with a gas inlet and a gas outlet communicated with the gas channel, and the gas outlet is communicated with the premixing cavity.

In the prior heat exchanger for supplying heat and the technical proposal of the patent, a middle heat insulation plate is not arranged in the spiral coil, and in daily use, the fire in the burner easily burns out the components at the lower part of the heat exchanger, thereby causing the damage of the heat exchanger.

In the above patent, since there are many accessories of the premix chamber or the premix, each accessory needs to be manufactured and assembled, which causes inconvenient installation and manufacturing and relatively high production cost; in addition, the existing combustion cylinder is easy to burn out after long-time use, and has the defect of short service life.

The intellectual property office discloses patent document with publication number 1077269 and patent name of quick gas water heater on 1 month and 2 2002, which comprises: a housing divided into a first space and a second space by a partition; a heat exchanger installed in said second space and having an annular lower duct with a cold water inlet, an annular upper duct with a hot water outlet, a plurality of spiral heat exchangers connected between said upper and lower ducts, and a smoke baffle installed at the center of said heat exchange tube for delaying the flow of heated air; an inner liner for closely wrapping the inner surface of said heat exchange tube of said heat exchanger; an outer liner having a height higher than the height of the inner liner and adapted to closely wrap the outer surface of the heat exchange tube; a lower plate for closing a lower portion between the inner and outer liners and having an air inlet at a center thereof; a vortex plate installed in the middle of the inner liner and having a plurality of air inlets on the periphery thereof and a gas hole in the central portion thereof; a combustion bowl mounted on said swirl plate a predetermined distance from said inner liner and having a plurality of air inlets on its contoured surface; a burner mounted in said combustion bowl; a heat insulating member spaced apart from the outer surface and the top of the outer liner by a predetermined distance, the heat insulating member having a top surface closed and a lower surface opened to form an annular air inlet; and an exhaust fan installed in the first space and adapted to exhaust the burned gas through the opening of the outer liner and the exhaust port of the partition plate. The technical scheme of the patent is as follows: the following drawbacks exist: the high-temperature flue gas in the existing heat exchanger flows faster, heat is not fully utilized, so that energy waste is caused, and the defect of low working efficiency of the heat exchanger occurs. In addition, a temperature sensor is generally used for temperature control of high-temperature flue gas in the heat exchanger, and when the temperature sensor is damaged, dry burning or high-temperature burning of the flue gas is easy to occur; the sealing effect is not ideal because the hot water outlet and the connecting piece in the technical proposal are sealed by the traditional sealing ring. In the technical solution of the above patent and the existing heat exchanger, there is no arc-shaped connection plate connecting the front cover and the rear cover of the heat exchanger in the heat exchanger.

Disclosure of Invention

The invention aims to provide a full premix combustion condensing heat exchanger with long service life.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

the full premix burning condensing heat exchanger comprises a full premix burner, a condensing front cover, a spiral coil, a heat insulation disc, a sealing cylinder, an arc-shaped connecting plate and a condensing rear cover, wherein the spiral coil is arranged in the sealing cylinder, the arc-shaped connecting plate is arranged on the periphery of the sealing cylinder, the condensing front cover and the condensing rear cover are arranged at two ends of the sealing cylinder and are respectively connected with two ends of the arc-shaped connecting plate, a water inlet pipe orifice of the spiral coil is communicated with a water inlet of the condensing rear cover, a water outlet pipe orifice of the spiral coil is communicated with a water outlet of the condensing front cover, an upper cover body in the full premix burner is connected with the condensing front cover, the combustion cylinder in the full premix burner penetrates through the condensing front cover to extend into the sealing cylinder, the spiral coil is arranged on the periphery of the combustion cylinder, and the heat insulation disc is arranged in the sealing cylinder and is arranged on the spiral coil.

Further, the full premix burner comprises a gas-air mixer, a fan, an ignition needle, a combustion cylinder, a gas mixing channel cover, a gas mixing channel body, an upper cover body and an annular gland, wherein the gas mixing channel outlet of the gas-air mixer is connected with the air inlet of the fan; the detection porcelain needle passes through the detection porcelain needle mounting hole on the upper cover body and is positioned beside the combustion cylinder; the ignition needle passes through the ignition needle mounting hole on the upper cover body and is positioned beside the combustion cylinder.

Further, the combustion cylinder adopts a porous fiber combustion cylinder, and comprises an outer cylinder, an inner cylinder, a top cover and a porous fiber outer net, wherein the inner cylinder is fixed in the outer cylinder, the top cover is arranged at the upper port of the outer cylinder, a plurality of through holes are distributed on the cylinder wall of the outer cylinder, the porous fiber outer net is sleeved on the outer surface of the outer cylinder, a flange is radially outwards extended from the lower port of the outer cylinder, the diameter of the flange is larger than that of a combustion cylinder mounting hole, the combustion cylinder penetrates through the combustion cylinder mounting hole, an annular gland is pressed on the flange to press and fix the combustion cylinder, and the annular gland is fixed on the bottom surface of a fuel gas mixing channel groove through screws.

Further, the condensing front cover comprises a cover body, a flat retainer ring A, O-shaped sealing ring A, a flat retainer ring B, O-shaped sealing ring B and a water outlet connecting piece, wherein a water outlet is formed in the cover body, internal threads are formed in the water outlet, the flat retainer ring A, O-shaped sealing ring A and the flat retainer ring B, O-shaped sealing ring B are sequentially stacked in the water outlet, an external threaded connector in the water outlet connecting piece stretches into the water outlet to tightly prop up the flat retainer ring A, O-shaped sealing ring A and the flat retainer ring B, O-shaped sealing ring B which are stacked together, and is in threaded connection with the water outlet; the water outlet connector also comprises a lock nut, wherein the lock nut is arranged on an external thread connector in the water outlet connector; and the cover body or the water outlet connecting piece is provided with an ultra-water temperature protection switch.

Further, the condensing type rear cover comprises a rear cover body and a smoke outlet top cover, a water inlet and a smoke outlet are formed in the rear cover body, the smoke outlet top cover is installed at the smoke outlet through screws, a smoke sealing ring is arranged between the smoke outlet and the smoke outlet top cover, a smoke discharging pipe joint is arranged on the smoke outlet top cover, and a smoke flow blocking plate is arranged in a smoke channel of the rear cover body.

Further, the condensing type rear cover further comprises a flat check ring A, O-shaped sealing ring A, a flat check ring B, O-shaped sealing ring B and a water inlet connecting piece, wherein internal threads are arranged in the water inlet, the flat check ring A, O-shaped sealing ring A and the flat check ring B, O-shaped sealing ring B are sequentially stacked in the water inlet, one end of the water inlet connecting piece is an external threaded connector, the other end of the water inlet connecting piece is a water pipe connector, the external threaded connector stretches into the water inlet, and the flat check ring A, O-shaped sealing ring A and the flat check ring B, O-shaped sealing ring B which are stacked together are tightly propped up and are in threaded connection with the water inlet. The water inlet connector further comprises a lock nut, wherein the lock nut is arranged on the external thread connector in the water inlet connector.

Further, a sensor mounting opening is formed in the smoke outlet top cover, a smoke temperature sensor is arranged at the sensor mounting opening, a sensor mounting opening is formed in the rear cover body, and a temperature sensor is arranged at the sensor mounting opening.

Further, the arc-shaped connecting plate comprises an arc-shaped plate body, an upper connecting beam and a lower connecting beam are respectively connected to the upper side edge and the lower side edge of the arc-shaped plate body, metal rods are pre-buried at two ends of the upper connecting beam and the lower connecting beam, and screw holes are formed in the end faces of the metal rods.

Further, the heat insulation plate comprises a fixed plate and a heat insulation plate, wherein a spiral fixing plate is arranged on the periphery of the fixed plate, the fixed plate is fixed in a spiral coil of the heat exchanger through the spiral fixing plate, and the heat insulation plate is arranged on the fixed plate and is detachably connected with the fixed plate.

Further, the heat insulation plate further comprises a soft heat insulation plate, and the soft heat insulation plate is arranged between the fixed plate and the heat insulation plate.

The invention has the beneficial effects that:

because the heat insulation disc is additionally arranged in the sealing cylinder, the lower part (condensing type rear cover) of the heat exchanger can be prevented from being burnt by fire in the burner; the spiral fixing piece is additionally arranged on the fixing disc, so that the fixing in the spiral coil is facilitated; because the heat insulation plate and the fixed plate are detachably connected, the heat insulation plate can be conveniently replaced; because the soft heat insulation plate is additionally arranged between the heat insulation plate and the fixed plate, the heat insulation effect can be further improved, and the service life of the heat exchanger is prolonged;

because the gas mixing channel body and the upper cover body are integrally formed castings, the processing procedures are reduced, the processing of the gas mixing channel body and the upper cover body is facilitated, the assembly between the gas mixing channel body and the upper cover body is omitted, and the installation is facilitated; the combustion cylinder is fixed by the annular gland, so that the installation is convenient; as the combustion cylinder adopts the porous fiber combustion cylinder, the combustion cylinder has the characteristic of long service life;

because the smoke baffle is additionally arranged in the smoke channel of the rear cover body, the smoke baffle can block part of smoke with high temperature to make the smoke flow back, the water at the lower part of the spiral pipe is heated for the second time, the back-flowing smoke enters the smoke channel between the smoke baffle and the rear cover body from the notch below the smoke baffle, and then flows through the smoke outlet to be discharged from the smoke discharge pipe joint, thereby playing the role of saving medicine energy and greatly improving the working efficiency of the heat exchanger;

the two temperature sensors are arranged on the condensed cover, so that the double protection effect can be achieved, and the phenomenon that the heat exchanger is burnt out or dry burning is prevented due to the fact that the temperature of the flue gas is too high is prevented, and the heat exchanger has the characteristics of safety and reliability;

because the two flat check rings and the two O-shaped sealing rings are overlapped in a staggered way, the sealing effect of the water inlet is greatly improved; because the locking nut is additionally arranged, the water inlet connecting piece is more firmly connected with the water inlet;

the arc-shaped connecting plate has the heat preservation function in the heat exchanger, and also has the function of connecting and fixing the front cover and the rear cover of the heat exchanger; because the metal rod is embedded, the high-temperature sliding wire condition is effectively reduced, and the service life of the arc-shaped connecting plate is prolonged; because a plurality of reinforcing ribs are distributed on the surface of the arc-shaped plate body, the arc-shaped plate body is firmer and more durable and is not easy to deform.

Drawings

The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one skilled in the art without inventive effort from the following figures:

FIG. 1 is an exploded view of the present invention;

FIG. 2 is an enlarged view of the full premix burner of FIG. 1;

FIG. 3 is an exploded view of the fully premixed burner of FIG. 2;

FIG. 4 is a schematic view of the structure of the gas mixing channel body and the upper cover shown in FIG. 3;

FIG. 5 is a cross-sectional view of the combustion can shown in FIG. 3;

FIG. 6 is a perspective view of the combustion can shown in FIG. 5;

FIG. 7 is an exploded view of the condensing front cover of FIG. 1;

FIG. 8 is an enlarged view of the insulating pan of FIG. 1;

FIG. 9 is an exploded view of the insulating disk of FIG. 8;

FIG. 10 is a schematic view of the structure of the retaining plate shown in FIG. 9;

FIG. 11 is a perspective view of the holding pan of FIG. 10;

FIG. 12 is a schematic view of the arc-shaped connection plate shown in FIG. 1;

FIG. 13 is a side view of the view shown in FIG. 12;

FIG. 14 is a perspective view of the device shown in FIG. 12;

FIG. 15 is an enlarged view of the condensing rear cover of FIG. 1;

FIG. 16 is an exploded view of the condensing rear cover of FIG. 15;

fig. 17 is a schematic structural view of the rear cover shown in fig. 16.

Fig. 18 is a schematic structural view of the cover shown in fig. 7.

In the figure: 1. a gas-air mixer; 2. A blower; 3. A gas mixing channel body; 4. A combustion cylinder; 5. an annular gland; 6. A gas mixing channel cover; 7. an ignition needle; 8. detecting a porcelain needle; 9. a gas mixing channel groove; 10. a mixed gas through hole; 11. a combustion cylinder mounting hole; 12. detecting a porcelain needle mounting hole; 13. an ignition needle mounting hole; 14. reinforcing ribs; 15. a screw; 16. a screw; 17. a flange; 18. a screw; 19. a sealing gasket; 20. a heat insulating plate; 21. a seal ring; 22. a central bore; 23. the ignition needle passes through the hole; 24. a seal ring; 25. a flange; 26. an upper cover; 27. an outer cylinder; 28. an inner cylinder; 29. a top cover; 30. a porous fibrous outer web; 31. a through hole; 32. a heat insulating ring; 33. detecting a porcelain needle penetrating hole; 34. a full premix burner; 35. a condensing front cover; 36. a spiral coil; 37. a heat insulating tray; 38. a sealing cylinder; 39. an arc-shaped connecting plate; 40. a condensing rear cover; 41. a seal ring; 42. a seal ring; 43. a screw; 44. a screw; 45. a cover body; 46. a flat check ring A; 47. an O-shaped sealing ring A; 48. a flat check ring B; 49. an O-shaped sealing ring B; 50. a water outlet connector; 51. a lock nut; 52. a water outlet; 53. an external threaded joint; 54. an ultra-water temperature protection switch; 55. a fixed plate; 56. a screw; 57. soft heat insulation board; 58. a nut; 59. a heat insulating plate; 60. a spiral fixing piece; 61. a central bore; 62. a jack; 63. a plug hole; 64. inserting sheets; 65. an arc-shaped plate body; 66. An upper connecting beam; 67. A lower connection beam; 68. A metal rod; 69. a screw hole; 70. reinforcing ribs; 71. a rear cover; 72. A flat check ring A; 73. An O-shaped sealing ring A; 74. A flat check ring B; 75. an O-shaped sealing ring B; 76. A water inlet connector; 77. A lock nut; 78. a water inlet; 79. an external threaded joint; 80. a water pipe joint; 81. a screw; 82. a flue gas outlet; 83. a sensor mounting port; 84. a smoke baffle; 85. a screw; 86. a smoke sealing ring; 87. a flue gas outlet top cover; 88. a smoke exhaust pipe joint; 89. a sealing gasket; 90. a temperature sensor; 91. a sensor mounting port; 92. a flue gas temperature sensor; 93. a chassis; 94. an arc-shaped groove; 95. an arc-shaped groove; 96. and a condensed water drain outlet.

Detailed Description

In order to better understand the technical solutions of the present invention, the following description will be made in detail with reference to the accompanying drawings and specific embodiments, and it should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

As shown in FIG. 1, the full premix combustion condensing heat exchanger comprises a full premix burner 34, a condensing front cover 35, a spiral coil 36, a heat insulation disc 37, a sealing cylinder 38, an arc-shaped connecting plate 39 and a condensing rear cover 40, wherein two arc-shaped connecting plates 39 are arranged, the spiral coil 36 is arranged in the sealing cylinder 38, the two arc-shaped connecting plates 39 are arranged on the periphery of the sealing cylinder 38, the condensing front cover 35 and the condensing rear cover 40 are arranged at two ends of the sealing cylinder 38, sealing rings 41 with V-shaped cross sections are arranged at one ends of the condensing front cover 35 and the sealing cylinder 38, sealing rings 42 with V-shaped cross sections are arranged at the other ends of the condensing rear cover 40 and the sealing cylinder 38, the condensing front cover 35 is connected with one ends of the two arc-shaped connecting plates 39 through 4 screws 43, and the condensing rear cover 40 is connected with the other ends of the two arc-shaped connecting plates 39 through 4 screws 44.

The water inlet pipe mouth of the spiral coil 36 is communicated with the water inlet of the condensing rear cover 40, the water outlet pipe mouth of the spiral coil 36 is communicated with the water outlet of the condensing front cover 35, the upper cover body 26 in the full premix burner 34 is connected with the condensing front cover 35 through screws, the combustion cylinder 4 in the full premix burner 34 penetrates through the condensing front cover 35 to extend into the sealing cylinder 38, the spiral coil 36 is positioned on the periphery of the combustion cylinder 38, the heat insulation plate 37 is arranged in the sealing cylinder 38 and is arranged on the spiral coil 36.

As shown in fig. 2, 3 and 4, the full premix burner 34 comprises a gas-air mixer 1, a fan 2, a gas mixing channel body 3, a combustion cylinder 4, an annular gland 5, a gas mixing channel cover 6, an ignition needle 7, a detection porcelain needle 8 and an upper cover body 26, wherein the upper cover body 26 is used for being connected with a heat exchanger condensation front cover, the gas mixing channel body 3 and the upper cover body 26 are integrally formed by casting, the fan 2 adopts a variable-frequency speed fan, a gas mixing outlet of the gas-air mixer 1 is connected with an air inlet of the fan 2, one side surface of the gas mixing channel body 3 is provided with a gas mixing channel groove 9, the bottom surface of the gas mixing channel groove 9 is provided with a gas mixing through hole 10, a combustion cylinder mounting hole 11, a detection porcelain needle mounting hole 12, an ignition needle mounting hole 13 and a plurality of concentric circular arc reinforcing ribs 14 are arranged on the upper cover body 26 and outside the gas mixing channel groove 9, the center of the center is the center of the combustion cylinder mounting hole 11, the end part of the combustion cylinder 4 is extended outwards along the radial direction, the diameter of the flange 25 is larger than that of the combustion cylinder mounting hole 11, the combustion cylinder 4 passes through the combustion cylinder mounting hole 11, the annular gland 5 is pressed on the flange 25 to tightly press and fix the combustion cylinder 4, the annular gland 5 is fixed on the bottom surface of the gas mixing channel slot 9 through a screw 15, the ignition needle 7 passes through the ignition needle mounting hole 13 on the upper cover 26 and is positioned beside the combustion cylinder 4, the detection porcelain needle 8 passes through the detection porcelain needle mounting hole 12 on the upper cover 26 and is positioned beside the combustion cylinder 4, the gas mixing channel cover 6 is attached on the surface of the gas mixing channel body 3 and is fixed by the screw 16 to seal the gas mixing channel slot 9, the air outlet of the fan 2 is communicated with the gas mixing through hole 10, the concrete connection mode is as follows: the air outlet of the fan 2 is provided with a flange 17, the flange 17 is connected with the gas mixing channel body 3 through a screw 18, and a sealing gasket 19 is arranged between the flange 17 and the gas mixing channel body 3.

Further, the heat insulation plate 20 and the sealing ring 21 are further included, a central hole 22, an ignition needle penetrating hole 23 and a detection porcelain needle penetrating hole 33 are formed in the plate surface of the heat insulation plate 20, the combustion cylinder 4 penetrates through the central hole 22, and the heat insulation plate 20 and the sealing ring 21 are arranged between the upper cover body 26 and the heat exchanger condensation front cover, in other words, the upper cover body 26 is in sealing connection with the heat exchanger condensation front cover. A sealing ring 24 is arranged between the gas mixing channel cover 6 and the gas mixing channel body 3.

As shown in fig. 5 and 6, the combustion cylinder adopts a porous fiber combustion cylinder, and comprises an outer cylinder 27, an inner cylinder 28, a top cover 29 and a porous fiber outer net 30, wherein the inner cylinder 28 is fixed in the outer cylinder 27, the top cover 29 is arranged at the upper port of the outer cylinder 27, a plurality of through holes 31 are distributed on the cylinder wall of the outer cylinder 27, the porous fiber outer net 30 is sleeved on the outer surface of the outer cylinder 27, and the lower port of the outer cylinder 27 is radially and outwards extended with the flange 25. The outer cylinder 27 is also sleeved with a heat insulation ring 32.

As shown in fig. 7, the condensing front cover 35 includes a cover body 45, a flat check ring a46, an O-ring a47, a flat check ring B48, an O-ring B49, a water outlet connector 50 and a locking nut 51, the locking nut 51 is disposed on an external threaded joint 53 in the water outlet connector 50, a water outlet 52 is disposed on the cover body 45, an internal thread is disposed in the water outlet 52, the flat check ring a46, the O-ring a47, the flat check ring B48 and the O-ring B49 are sequentially stacked in the water outlet 52, the external threaded joint 53 in the water outlet connector 50 extends into the water outlet 52 to be in threaded connection with the water outlet 52, and simultaneously, the stacked flat check ring a46, the O-ring a47, the flat check ring B48 and the O-ring B49 are tightly pressed, and then the locking nut 51 is used to lock the water outlet connector. In addition, the water outlet connector 50 is provided with an ultra-water temperature protection switch 54.

As shown in fig. 8, 9, 10 and 11, the heat insulation plate 37 comprises a fixing plate 55, a screw 56, a soft heat insulation plate 57, a nut 58 and a heat insulation plate 59, wherein a spiral fixing plate 60 is arranged on the periphery of the fixing plate 55, the fixing plate 55 is fixedly inserted on the spiral coil 36 through the spiral fixing plate 60, one end part of the screw 56 is welded on the central part of the fixing plate 55, the nut 58 is arranged on the central part of the plate surface of the heat insulation plate 59, the heat insulation plate 59 is mounted on the fixing plate 55 through the cooperation of the nut 58 and the screw 56, the soft heat insulation plate 57 is arranged between the fixing plate 55 and the heat insulation plate 59, and the screw 56 penetrates through a central hole 61 of the soft heat insulation plate 57. More than two insertion holes 62 are distributed on the periphery of the fixing plate 55, insertion holes 63 corresponding to the insertion holes 62 are distributed on the periphery of the heat insulation plate 59, and insertion pieces 64 penetrate through the insertion holes 62 and extend into the insertion holes 63 to fix the heat insulation plate 59 on the fixing plate 55.

As shown in fig. 12, 13 and 14, the arc-shaped connecting plate 39 comprises an arc-shaped plate body 65, an upper connecting beam 66 and a lower connecting beam 67 are respectively connected to the upper side edge and the lower side edge of the arc-shaped plate body 65, metal rods 68 are pre-buried at two ends of the upper connecting beam 66 and the lower connecting beam 67, and screw holes 69 are formed in the end faces of the metal rods 68. A plurality of reinforcing ribs 70 are distributed on the surface of the arc-shaped plate body 65.

As shown in fig. 15 and 16, the condensing type rear cover 40 includes a rear cover body 71, a smoke outlet top cover 87, and a bottom chassis 93, and the rear cover body 71 is mounted on the bottom chassis 93 by screws 81. The rear cover 71 is provided with a water inlet 78, a smoke outlet 82 and a sensor mounting port 83, the sensor mounting port 83 is provided with a temperature sensor 90, and a smoke baffle 84 is arranged in a smoke channel of the rear cover 71. The flue gas outlet top cover 87 is arranged at the flue gas outlet 82 through the screw 85, a flue gas sealing ring 86 is arranged between the flue gas outlet 82 and the flue gas outlet top cover 87, a flue gas outlet pipe joint 88 is arranged on the flue gas outlet top cover 87, and a sealing gasket 89 is arranged in the flue gas outlet pipe joint 88. The flue gas outlet top cover 87 is provided with a sensor mounting port 91, and a flue gas temperature sensor 92 is arranged at the sensor mounting port 91.

The water inlet connector further comprises a flat check ring A72, an O-shaped seal ring A73, a flat check ring B74, an O-shaped seal ring B75, a water inlet connector 76 and a lock nut 77, wherein one end of the water inlet connector 76 is provided with an external threaded connector 79, the other end of the water inlet connector 76 is provided with a water pipe connector 80, the lock nut 77 is arranged on the external threaded connector 79, a water inlet 78 is arranged on the rear cover 71, internal threads are arranged in the water inlet 78, the flat check ring A72, the O-shaped seal ring A73, the flat check ring B74 and the O-shaped seal ring B75 are sequentially stacked in the water inlet 78, the external threaded connector 79 stretches into the water inlet 78 to be in threaded connection with the water inlet 78, and meanwhile the stacked flat check ring A72, the stacked O-shaped seal ring A73, the stacked flat check ring B74 and the stacked O-shaped seal ring B75 are tightly propped up, and then the water inlet connector is locked by the lock nut 77.

As shown in fig. 17, two arc-shaped grooves 94 are provided at the edge of the rear cover 71, one ends of the two arc-shaped connection plates 39 are respectively inserted into the two arc-shaped grooves 94, and the arc-shaped grooves 94 are used for positioning the ends of the arc-shaped connection plates 39, so as to facilitate connection between the rear cover of the condensing rear cover 40 and the arc-shaped connection plates.

As shown in fig. 18, two arc-shaped grooves 95 are provided at the edge of the cover 45, and the other ends of the two arc-shaped connection plates 39 are respectively inserted into the two arc-shaped grooves 95, and the arc-shaped grooves 95 are used for positioning the ends of the arc-shaped connection plates 39, so as to facilitate connection between the cover 45 of the condensing front cover 35 and the arc-shaped connection plates 39.

Working principle: firstly, fuel gas and air respectively enter the fuel gas air mixer 1 from a fuel gas inlet and an air inlet on the fuel gas air mixer 1, the formed mixed gas is pumped into the fuel gas mixing channel body 3 through a fan, enters the combustion cylinder 4 along the fuel gas mixing channel, and then the mixed gas is ignited by the ignition needle 7 to heat water in the spiral coil; water flows into the spiral coil from the water inlet on the condensing rear cover 40, and the water heated in the spiral coil flows out from the water outlet on the condensing front cover 35; the heat insulation disc 37 is arranged in the sealing cylinder 38 and positioned in the middle of the spiral coil, so that the heat insulation disc 37 has a certain shielding effect on the heat generated by the combustion cylinder 4, and the components of the condensing rear cover 40 can be prevented from being burnt; because the smoke baffle is additionally arranged in the smoke channel of the rear cover body, in order to prevent the high-temperature smoke from being discharged too quickly and the heat is not fully utilized, the smoke baffle can block part of the smoke with high temperature to make the smoke flow back, the water at the lower part of the spiral pipe (close to the condensing rear cover 40) is secondarily heated, and the back-flowing smoke enters the smoke channel between the smoke baffle and the rear cover body from a notch below the smoke baffle and flows through the smoke outlet to be discharged from the smoke discharge pipe joint. Condensed water generated during the heat exchange process of the combustion flue gas is discharged from the condensed water discharge port 96 on the condensing type rear cover 40.

The foregoing embodiments are merely illustrative of the present invention and are not intended to limit the spirit and scope of the present invention, and those of ordinary skill in the art should not depart from the spirit and scope of the present invention as set forth in the appended claims.

Claims

1. The utility model provides a full premix burning condensing heat exchanger, including full premix combustor, the condensing protecgulum, the spiral coil pipe, the thermal-insulated dish, sealed section of thick bamboo, arc connecting plate and condensing back lid, spiral coil pipe is established in sealed section of thick bamboo, the arc connecting plate is located sealed section of thick bamboo's periphery, condensing protecgulum and condensing back lid are established at sealed section of thick bamboo's both ends and are connected with the both ends of arc connecting plate respectively, spiral coil pipe's water inlet mouth of pipe and condensing back lid's water inlet intercommunication, spiral coil pipe's water outlet mouth of pipe and condensing protecgulum's delivery port intercommunication, upper cover body and condensing protecgulum in the full premix combustor are connected, the combustion section of thick bamboo in the full premix combustor passes in the condensing protecgulum stretches into sealed section of thick bamboo, spiral coil pipe is located the periphery of combustion section of thick bamboo, the thermal-insulated dish is established in sealed section of thick bamboo, and install on spiral coil pipe;

the heat insulation plate comprises a fixed plate and a heat insulation plate, wherein a spiral fixing plate is arranged on the periphery of the fixed plate, the fixed plate is fixed in a spiral coil of the heat exchanger through the spiral fixing plate, and the heat insulation plate is arranged on the fixed plate and is detachably connected with the fixed plate.

2. The full premix combustion condensing heat exchanger of claim 1, wherein: the full premix burner comprises a gas-air mixer, a fan, an ignition needle and a combustion cylinder, wherein a mixed gas outlet of the gas-air mixer is connected with an air inlet of the fan, and the full premix burner is characterized in that: the gas mixing channel comprises a heat exchanger condensing front cover, and is characterized by further comprising a gas mixing channel cover, a gas mixing channel body, an upper cover body and an annular gland, wherein the upper cover body is used for being connected with the heat exchanger condensing front cover, the gas mixing channel body and the upper cover body are integrally formed, a gas mixing channel groove is formed in one side surface of the gas mixing channel body, a mixed gas through hole and a combustion cylinder mounting hole are formed in the bottom surface of the gas mixing channel groove, the gas mixing channel cover is attached to the surface of the gas mixing channel body and is fixed by screws, so that the gas mixing channel groove is closed, and an air outlet of a fan is communicated with the mixed gas through hole; the detection porcelain needle passes through the detection porcelain needle mounting hole on the upper cover body and is positioned beside the combustion cylinder; the ignition needle passes through the ignition needle mounting hole on the upper cover body and is positioned beside the combustion cylinder.

3. The full premix combustion condensing heat exchanger of claim 1, wherein: the combustion cylinder adopts a porous fiber combustion cylinder, and comprises an outer cylinder, an inner cylinder, a top cover and a porous fiber outer net, wherein the inner cylinder is fixed in the outer cylinder, the top cover is arranged at the upper port of the outer cylinder, a plurality of through holes are distributed on the cylinder wall of the outer cylinder, the porous fiber outer net is sleeved on the outer surface of the outer cylinder, the lower port of the outer cylinder is radially and outwards extended to form a flange, the diameter of the flange is larger than that of a combustion cylinder mounting hole, the combustion cylinder penetrates through the combustion cylinder mounting hole, an annular gland is pressed on the flange to press and fix the combustion cylinder, and the annular gland is fixed on the bottom surface of a fuel gas mixing channel through screws.

4. The full premix combustion condensing heat exchanger of claim 1, wherein: the condensing front cover comprises a cover body, a flat check ring A, O-shaped sealing ring A, a flat check ring B, O-shaped sealing ring B and a water outlet connecting piece, wherein a water outlet is formed in the cover body, an internal thread is arranged in the water outlet, the flat check ring A, O-shaped sealing ring A and the flat check ring B, O-shaped sealing ring B are sequentially stacked in the water outlet, an external thread joint in the water outlet connecting piece stretches into the water outlet, and the flat check ring A, O-shaped sealing ring A and the flat check ring B, O-shaped sealing ring B stacked together are tightly propped up and are in threaded connection with the water outlet; the water outlet connector also comprises a lock nut, wherein the lock nut is arranged on an external thread connector in the water outlet connector; and the cover body or the water outlet connecting piece is provided with an ultra-water temperature protection switch.

5. The full premix combustion condensing heat exchanger of claim 1, wherein: the condensing type rear cover comprises a rear cover body and a smoke outlet top cover, wherein the rear cover body is provided with a water inlet and a smoke outlet, the smoke outlet top cover is arranged at the smoke outlet through screws, a smoke sealing ring is arranged between the smoke outlet and the smoke outlet top cover, a smoke discharging pipe joint is arranged on the smoke outlet top cover, and a smoke flow blocking plate is arranged in a smoke channel of the rear cover body.

6. The full premix combustion condensing heat exchanger of claim 5, wherein: the condensing type rear cover further comprises a flat check ring A, O-shaped sealing ring A, a flat check ring B, O-shaped sealing ring B and a water inlet connecting piece, wherein internal threads are arranged in the water inlet, the flat check ring A, O-shaped sealing ring A and the flat check ring B, O-shaped sealing ring B are sequentially stacked in the water inlet, one end of the water inlet connecting piece is an external threaded connector, the other end of the water inlet connecting piece is a water pipe connector, the external threaded connector stretches into the water inlet, and the flat check ring A, O-shaped sealing ring A and the flat check ring B, O-shaped sealing ring B which are stacked together are tightly propped up and are in threaded connection with the water inlet.

7. The full premix combustion condensing heat exchanger of claim 6, wherein: the flue gas outlet top cover is provided with a sensor mounting port, a flue gas temperature sensor is arranged at the sensor mounting port, the rear cover body is provided with a sensor mounting port, and a temperature sensor is arranged at the sensor mounting port.

8. The full premix combustion condensing heat exchanger of claim 1, wherein: the arc-shaped connecting plate comprises an arc-shaped plate body, wherein an upper side edge and a lower side edge of the arc-shaped plate body are respectively connected with an upper connecting beam and a lower connecting beam, metal rods are pre-buried at two ends of the upper connecting beam and the lower connecting beam, and screw holes are formed in end faces of the metal rods.

9. The full premix combustion condensing heat exchanger of claim 1, wherein: the heat insulation plate also comprises a soft heat insulation plate, and the soft heat insulation plate is arranged between the fixed plate and the heat insulation plate.