A coil boiler

Abstract

The present invention discloses a coil boiler, which relates to the technical field of boilers. The present invention includes a furnace body, a spiral coil installed in the furnace body, a flue gas collector, and a cylindrical heat collecting tank; the furnace body includes a rectangular outer shell; a connecting cylinder connected to the burner is provided on the end face of one end of the rectangular outer shell; an exhaust hole is provided on the upper surface of the other end of the rectangular outer shell, and a first flange ring is installed at the exhaust hole; a sealed box is fixed on the upper surface of the rectangular outer shell; an output pipe is fixedly connected to the sealed box, and a solenoid valve is provided on the output pipe; a pressure relief pipe is fixedly connected to the sealed box; a pressure relief valve is installed at the end of the pressure relief pipe; and a temperature sensor is sealed and installed through the sealed box. The present invention is composed of four major parts: a furnace body, a spiral coil, a flue gas collector, and a cylindrical heat collecting tank. The overall structure is compact and cooperates with the burner to have a three-stage heating process, effectively utilizing the flame ejected by the burner and the high-temperature flue gas to improve the overall energy efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a coil boiler. Background Art

[0002] At present, most coal-fired hot water boilers directly burn coal to obtain the required hot water. This type of coal-fired hot water boiler is prone to cause serious environmental pollution, and has high fuel heat loss and low utilization rate.

[0003] The Chinese patent announcement number CN202709431U discloses a horizontal gas-fired hot water boiler, which includes a furnace body, a water flow pipe, and a gas combustion pipe. The water flow pipe and the gas combustion pipe are arranged in layers and staggered in the furnace body. When in use, the heat from the high-temperature gas in the gas combustion pipe will be transferred to the water in the water flow pipe, so that the water in the water flow pipe is heated. During heating, since the high-temperature gas can only transfer heat to the side wall of the gas combustion pipe first, and then from the side wall of the gas combustion pipe to the water flow pipe, and finally the heat is transferred from the water flow pipe to the water flow, so that the water flow is heated, during heat transfer, the heat needs to pass through multiple layers of pipes to contact the water flow, and the heat transfer efficiency is low, which makes the water flow heating speed slow.

[0004] In addition, the invention with Chinese patent publication number CN107655200A relates to a coil boiler, including a furnace body and a combustion chamber arranged in the furnace body, a combustion gas inlet for spraying high-temperature gas into the combustion chamber at one end of the furnace body, an air outlet for discharging flue gas in the combustion chamber at the other end of the furnace body, a multi-layer pipe arranged around the combustion chamber, the pipe is spiral and surrounds the combustion chamber, a water inlet and a water outlet connected to the pipe are provided on the furnace body, and the cross-sectional area of the pipe decreases successively from the side close to the combustion chamber to the side far from the combustion chamber. By arranging multi-layer pipes and gradually reducing the cross-sectional area of the pipes, the temperature of the water in the multi-layer pipes can be made to rise evenly and the heating efficiency can be basically consistent, thereby improving the heating efficiency of the water.

[0005] The above technical solution utilizes multiple layers of stacked pipes to fully utilize the gas flame, and reduces the pipe cross-section to achieve heat exchange at different locations. This results in numerous pipe passages, a complex structure, and high manufacturing and maintenance costs. To address the above technical issues, this application document provides a coil boiler. Summary of the Invention

[0006] The purpose of the present invention is to provide a coil boiler, which is composed of four major parts: a furnace body, a spiral coil, a flue gas collector and a cylindrical heat collecting tank. The overall structure is compact and cooperates with the burner to have a three-stage heating process, effectively utilizing the flame ejected by the burner and the high-temperature flue gas to improve the overall energy efficiency.

[0007] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] The present invention is a coil boiler, comprising a furnace body, a spiral coil installed in the furnace body, a flue gas collector, and a cylindrical heat collecting tank; the furnace body comprises a rectangular outer shell; a connecting cylinder connected to a burner is provided on an end face of one end of the rectangular outer shell; an exhaust hole is opened on the upper surface of the other end of the rectangular outer shell, and a first flange ring is installed at the exhaust hole; a sealed box is fixed to the upper surface of the rectangular outer shell; an output pipe is fixedly connected to the sealed box and an electromagnetic valve is provided on the output pipe; a pressure relief pipe is fixedly connected to the sealed box; a pressure relief valve is installed at the end of the pressure relief pipe; a temperature sensor is sealed and installed through the sealed box.

[0009] The lower half of the flue gas heat collector passes through the exhaust port into the interior of the rectangular outer shell, where it is then bolted to the first flange ring. The cylindrical heat collecting tank is installed within the rectangular outer shell, with one end of the cylindrical heat collecting tank abutting the inner wall of the rectangular outer shell at one end of the connecting tube. The lower end of the flue gas heat collector is connected to the adjacent lower end of the cylindrical heat collecting tank via a conduit; the spiral coil is installed within the cylindrical heat collecting tank. The water inlet of the spiral coil is fixedly connected to the upper inner wall of the cylindrical heat collecting tank; the water outlet of the spiral coil passes through the cylindrical heat collecting tank and the rectangular outer shell, then is fixedly connected to the enclosed tank.

[0010] As a preferred technical solution of the present invention, the exterior of the spiral coil is connected and fixed into one piece by a plurality of connecting rods.

[0011] As a preferred technical solution of the present invention, the flue gas collector includes a cylindrical cavity; a second flange plate that cooperates with the first flange ring is fixed to the circumferential side surface of the lower end of the cylindrical cavity; a plurality of exhaust heat exchange pipes that pass through the upper and lower ends of the cylindrical cavity are provided on the cylindrical cavity; a water supply pipe joint is fixedly connected to the upper end of the cylindrical cavity; and a heat exchange cylinder with pointed upper and lower ends is fixedly connected to the lower end of the cylindrical cavity.

[0012] As a preferred technical solution of the present invention, the cylindrical heat collecting tank is a cavity structure in the shape of a rectangular cylinder; a plurality of support bars in contact with the inner wall of the rectangular outer shell are fixed to the circumferential side surface of the cylindrical heat collecting tank; two symmetrically arranged trapezoidal support rods are fixed to the inner bottom of the cylindrical heat collecting tank, and the contact surface between the trapezoidal support rod and the spiral coil is set to a circular arc surface.

[0013] As a preferred technical solution of the present invention, a plurality of heat-conducting red plates are fixed to the peripheral side surface of the heat exchange tube.

[0014] The present invention has the following beneficial effects:

[0015] 1. The coil boiler of the present invention consists of four major parts: furnace body, spiral coil, flue gas collector and cylindrical heat collecting tank. The overall structure is compact and cooperates with the burner to have a three-stage heating process, effectively utilizing the flame ejected by the burner and high-temperature flue gas to improve overall energy efficiency.

[0016] 2. The flue gas heat collector of this invention is also divided into two heating sections: a primary heating section within the upper cylindrical cavity and a secondary heating section within the lower heat exchange tube. High-temperature flue gas generated by the burner first flows around the periphery of the heat exchange tube to participate in heat exchange in the secondary heating section, then ascends through several exhaust heat exchange tubes to participate in heat exchange in the primary heating section. This allows for graded utilization of the high-temperature flue gas, enhancing exhaust gas energy recovery.

[0017] 3. The cylindrical heat collecting tank of the present invention is covered on the circumference of the spiral coil. The cylindrical heat collecting tank conducts the flame sprayed by the burner and the heat energy radiated through the gap of the spiral coil for secondary heating, thereby improving the utilization rate of the burner's direct flame spray heating process.

[0018] 4. The present invention reduces manufacturing and assembly costs and subsequent maintenance costs, and reduces manufacturing and maintenance difficulties through the modular design of the furnace body, spiral coil, flue gas collector and cylindrical heat collecting tank.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a structural schematic diagram of a coil boiler of the present invention.

[0022] Figure 2 It is a right side view of the present invention.

[0023] Figure 3 It is a top view of the present invention.

[0024] Figure 4 for Figure 3 Cross-sectional view at AA in the middle.

[0025] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0026] Figure 6 Schematic diagram of the furnace structure.

[0027] Figure 7 Schematic diagram of the structure of the spiral coil.

[0028] Figure 8 Schematic diagram of the structure of the flue gas collector.

[0029] Figure 9 It is a structural diagram of a cylindrical water collecting tank.

[0030] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0031] 1-furnace body, 2-spiral coil, 3-flue gas collector, 4-cylindrical heat collecting tank, 5-conduit, 11-rectangular outer shell, 12-connecting tube, 13-exhaust hole, 14-first flange ring, 15-sealed box, 16-output pipe, 17-solenoid valve, 18-pressure relief pipe, 19-pressure relief valve, 110-temperature sensor, 21-connecting rod, 31-cylindrical cavity, 32-second flange, 33-exhaust heat exchange pipe, 34-water supply pipe joint, 35-heat exchange tube, 36-heat conduction red plate, 41-support bar, 42-trapezoidal support rod. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Specific embodiment one:

[0034] See also Figure 1-6 As shown, the present invention is a coil boiler, comprising a furnace body 1, a spiral coil 2 installed in the furnace body 1, a flue gas collector 3, and a cylindrical heat collecting tank 4; the furnace body 1 comprises a rectangular outer shell 11; a connecting cylinder 12 connected to a burner (not shown) is provided on one end face of the rectangular outer shell 11; an exhaust hole 13 is provided on the upper surface of the other end of the rectangular outer shell 11, and a first flange ring 14 is installed at the exhaust hole 13; a sealed box 15 is fixed on the upper surface of the rectangular outer shell 11; an output pipe 16 is fixedly connected to the sealed box 15 and an electromagnetic valve 17 is provided on the output pipe 16; a pressure relief pipe 18 is fixedly connected to the sealed box 15; a pressure relief valve 19 is installed at the end of the pressure relief pipe 18; a temperature sensor 110 is sealed and installed through the sealed box 15. When the temperature sensor 110 detects that the temperature inside the sealed box 15 reaches the set temperature, the solenoid valve 17 opens. When the pressure inside the sealed box 15 rises to the safety limit in a short time, the pressure relief valve 19 is opened to release the pressure, thereby ensuring the safety of the entire boiler operation.

[0035] The lower half of the flue gas collector 3 passes through the exhaust port 13 into the rectangular outer shell 11 and is then bolted to the first flange ring 14. The flue gas collector 3 is mounted on the first flange ring 14 at the exhaust port 13, allowing combustion flue gases to be discharged only through the flue gas collector 3. The flue gas collector 3 is connected to an external water supply pipe, which continuously supplies water from the top. As the flue gas passes through the flue gas collector 3, it exchanges heat with the incoming cold water, providing initial heating within the flue gas collector 3.

[0036] The cylindrical heat collecting tank 4 is installed inside the rectangular outer shell 11, with one end of the cylindrical heat collecting tank 4 abutting against the inner wall of the rectangular outer shell 11 at one end of the connecting tube 12. The lower end of the flue gas collector 3 is connected to the adjacent lower end of the cylindrical heat collecting tank 4 via a conduit 5. The spiral coil 2 is installed inside the cylindrical heat collecting tank 4. The cylindrical heat collecting tank 4 surrounds the spiral coil 2. The flame and radiant heat from the burner pass through the gaps in the spiral coil 2 directly into the cylindrical heat collecting tank 4, then enter the cylindrical heat collecting tank 4 through the flue gas collector 3 and conduit 5, where they undergo secondary heating.

[0037] The water inlet end of the spiral coil 2 is fixedly connected to the upper inner wall of the cylindrical heat collecting tank 4; the water outlet end of the spiral coil 2 passes through the cylindrical heat collecting tank 4 and the rectangular outer shell 11 and is fixedly connected to the closed box 15.

[0038] The burner's nozzle is inserted from the connecting tube 12 . When started, the high-temperature long-line flame directly heats the spiral coil 2 , and the water flow undergoes third-stage heating in the spiral coil 2 .

[0039] like Figure 7 As shown, the outside of the spiral coil 2 is connected and fixed into one piece by a plurality of connecting rods 21 to improve the thermal stability of the entire spiral coil 2.

[0040] like Figure 5 and Figure 8 As shown, the flue gas collector 3 includes a cylindrical cavity 31; a second flange plate 32 that cooperates with the first flange ring 14 is fixed to the circumferential side surface of the lower end of the cylindrical cavity 31; a plurality of exhaust heat exchange pipes 33 that pass through the upper and lower ends of the cylindrical cavity 31 are provided on the cylindrical cavity 31; a water supply pipe joint 34 is fixedly connected to the upper end of the cylindrical cavity 31; a heat exchange tube 35 with pointed upper and lower ends is fixedly connected to the lower end of the cylindrical cavity 31, and a plurality of heat-conducting red plates 36 are fixed to the circumferential side surface of the heat exchange tube 35.

[0041] The flue gas heat collector 3 is similarly divided into two heating sections: the primary heating section, located within the upper cylindrical cavity 31, and the secondary heating section, located within the lower heat exchange tube 35. The high-temperature flue gas generated by the burner first flows around the heat exchange tube 35, participating in heat exchange in the secondary heating section, and then ascends through a number of exhaust heat exchange tubes 33 to participate in heat exchange in the primary heating section.

[0042] like Figure 9 As shown, the cylindrical heat collecting tank 4 has a rectangular cylindrical cavity structure. Several support bars 41 are fixed to the circumferential side of the cylindrical heat collecting tank 4, contacting the inner wall of the rectangular outer shell 11. Two symmetrically arranged trapezoidal support rods 42 are fixed to the inner bottom of the cylindrical heat collecting tank 4, and the contact surfaces between the trapezoidal support rods 42 and the spiral coil 2 are designed as arc surfaces. The support bars 41 on the circumferential side of the cylindrical heat collecting tank 4 contact the inner wall of the rectangular outer shell 11, reducing the relative contact area with the furnace body 1, reducing ineffective heat conduction, and minimizing heat loss during the second stage of heating.

[0043] The coil boiler of the present invention consists of four major parts: a furnace body 1, a spiral coil 2, a flue gas collector 3 and a cylindrical heat collecting tank 4. The overall structure is compact and cooperates with the burner to have a three-stage heating process, effectively utilizing the flame ejected by the burner and the high-temperature flue gas to improve the overall energy efficiency.

[0044] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0045] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A coil boiler comprising a furnace body (1) and a spiral coil (2) installed in the furnace body (1), characterized in that: It also includes a flue gas heat collector (3) and a cylindrical heat collecting tank (4); The furnace body (1) comprises a rectangular outer shell (11); a connecting tube (12) connected to a burner is provided on one end surface of the rectangular outer shell (11); an exhaust hole (13) is provided on the upper surface of the other end of the rectangular outer shell (11), and a first flange ring (14) is installed at the exhaust hole (13); a sealed box (15) is fixed on the upper surface of the rectangular outer shell (11); an output pipe (16) is fixedly connected to the sealed box (15), and a solenoid valve (17) is provided on the output pipe (16); a pressure relief pipe (18) is fixedly connected to the sealed box (15); a pressure relief valve (19) is installed at the end of the pressure relief pipe (18); a temperature sensor (110) is sealed and installed through the sealed box (15); The lower half of the flue gas heat collector (3) passes through the exhaust hole (13) to the inside of the rectangular outer shell (11), and is then connected to the first flange ring (14) by bolts; The cylindrical heat collecting tank (4) is installed inside the rectangular outer shell (11), and one end of the cylindrical heat collecting tank (4) is attached to the inner wall of the rectangular outer shell (11) located at one end of the connecting tube (12); The lower end of the flue gas heat collector (3) is connected to the lower adjacent end of the cylindrical heat collecting tank (4) through a conduit (5); The spiral coil (2) is installed inside the cylindrical heat collecting tank (4); The water inlet end of the spiral coil (2) is fixedly connected to the upper inner wall of the cylindrical heat collecting tank (4); the water outlet end of the spiral coil (2) passes through the cylindrical heat collecting tank (4) and the rectangular outer shell (11) and is fixedly connected to the closed box (15).

2. A coil boiler according to claim 1, characterized in that: The exterior of the spiral coil (2) is connected and fixed into one piece via a plurality of connecting rods (21).

3. The coil boiler according to claim 1, characterized in that: The flue gas heat collector (3) comprises a cylindrical cavity (31); a second flange (32) matched with the first flange ring (14) is fixed on the circumferential side surface of the lower end of the cylindrical cavity (31); a plurality of exhaust heat exchange pipes (33) passing through the upper and lower ends of the cylindrical cavity (31) are provided on the cylindrical cavity (31); a water supply pipe joint (34) is fixedly connected to the upper end of the cylindrical cavity (31); and a heat exchange cylinder (35) with pointed upper and lower ends is fixedly connected to the lower end of the cylindrical cavity (31).

4. The coil boiler according to claim 1, characterized in that: The cylindrical heat collecting tank (4) is a rectangular cylindrical cavity structure; a plurality of support bars (41) in contact with the inner wall of the rectangular outer shell (11) are fixed to the circumferential side surface of the cylindrical heat collecting tank (4); two symmetrically arranged trapezoidal support rods (42) are fixed to the inner bottom of the cylindrical heat collecting tank (4), and the contact surface between the trapezoidal support rods (42) and the spiral coil (2) is set as an arc surface.

5. The coil boiler according to claim 3, characterized in that: A plurality of heat-conducting red plates (36) are fixed to the peripheral side surface of the heat exchange cylinder (35).

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