Waste heat recovery device of gas-fired boiler

Abstract

The utility model provides a waste heat recovery device of a gas-fired boiler, which belongs to the technical field of flue gas treatment and comprises a heat-insulating shell, a smoke inlet pipe, a smoke outlet, a gas inlet pipe, a gas outlet pipe and a gas outlet pipe. The filter structure comprises a filter screen fixed in the water inlet pipe, a sewage tank fixed at the bottom end of the water inlet pipe and connected with the filter screen, a cover plate detachably mounted at the bottom end of the sewage tank, and a cleaning assembly arranged on one side of the water inlet pipe. According to the device, foreign matters are prevented from entering the heat conduction copper pipe through the filter screen, the motor is started to drive the filter screen to sweep the foreign matters on the surface of the cleaning brush, and meanwhile, the foreign matters move leftwards and enter the sewage tank, so that the liquid filtering function of the device is realized, and liquid entering the device is conveniently filtered; foreign matters such as rust, silt and microorganisms are removed, the heat conduction copper pipe is prevented from being blocked, the service life of the device is prolonged, and the functionality of the device is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, and particularly relates to a waste heat recovery device for a gas boiler. Background Art

[0002] A gas boiler is a heat energy conversion device that uses gaseous fuels such as natural gas and city gas as energy sources, and is widely used in multiple fields such as industrial production, heating, and domestic hot water. During the use of a gas boiler, a large amount of heat is discharged along with the flue gas. Therefore, a waste heat recovery device for a gas boiler is established to recover the heat in the flue gas, reduce heat waste, and improve the utilization rate of gaseous fuels at the same time.

[0003] After retrieval, a patent with the Chinese patent application number 202222519605.4 discloses a waste heat recovery device for a gas boiler, which relates to the technical field of gas boilers. The waste heat recovery device for a gas boiler includes a box body, a filtering and adsorbing component, and a connecting component. A first support plate is fixedly installed on one side of the box body, and a smoke outlet pipe is fixedly installed on one side of the box body and is communicated with the inside of the box body. A valve is arranged on the smoke outlet pipe. Through the cooperation of the second support plate, the motor, the threaded rod, the first guide rod, the moving box, the connecting pipe, the C-shaped pipe, the n-shaped plate, and the flexible brush, the utility model can adsorb excessive water vapor attached to the outer surface of the curved pipe during waste heat recovery, ensure the conductivity of the curved pipe to a certain extent, reduce the working time, effectively prevent the rusting and damage of internal parts of the device, improve the cleanliness of the device, and extend the service life of the device. The activated carbon can adsorb harmful gases such as carbon monoxide and soot contained in the high-temperature flue gas;

[0004] The above patent still has the following deficiencies: (1) The internal blockage of the heat-conducting copper pipe is prone to occur. During use, water contains various impurities such as rust, sediment, and microorganisms. These impurities will enter the heat-conducting copper pipe with the water flow and deposit in the pipe, gradually forming a blockage. At the same time, excessive calcium, magnesium and other hardness substances in the water will also form scale in the pipe, further aggravating the blockage and affecting the normal use of the device;

[0005] (2) It is not convenient to clean the inside of the device. During the combustion of gas, some ash and unburned carbon particles will adhere to the surfaces of the heat-conducting copper pipe and the heat-conducting fin. However, since the heat-conducting copper pipe and the heat-conducting fin are installed inside the heat preservation shell, it is not convenient for the staff to contact the heat-conducting copper pipe and the heat-conducting fin for maintenance and cleaning.

[0006] Therefore, there is an urgent need for a waste heat recovery device for a gas boiler to solve the above problems. Summary of the Utility Model

[0007] The object of the present utility model is to address the defect that the inside of the heat-conducting copper tube is prone to blockage. During use, water contains various impurities, such as rust, sediment, microorganisms, etc. These impurities will enter the heat-conducting copper tube along with the water flow and deposit inside the pipeline, gradually forming a blockage. At the same time, excessive calcium, magnesium and other hardness substances in the water will also form scale inside the pipeline, further exacerbating the blockage and affecting the normal use of the device.

[0008] In order to achieve the above-mentioned invention object, the present utility model provides the following technical solutions:

[0009] A waste heat recovery device for a gas boiler, including a heat preservation shell, and also including,

[0010] An inlet smoke pipe, installed at the bottom end of the heat preservation shell;

[0011] An exhaust smoke port, installed at the top end of the heat preservation shell, and a demister is installed inside the exhaust smoke port;

[0012] An inlet water pipe, installed at the bottom end on one side of the heat preservation shell, and heat-conducting copper tubes are connected to one side of the inlet water pipe. Heat-conducting fins are fixedly arranged at equal intervals on the outer side of the heat-conducting copper tubes;

[0013] A filtering structure, arranged on one side of the inlet water pipe. Among them, the filtering structure includes a filter screen fixed inside the inlet water pipe, a sewage tank fixed at the bottom end of the inlet water pipe and connected to the filter screen, a cover plate detachably installed at the bottom end of the sewage tank, and a cleaning component arranged on one side of the inlet water pipe;

[0014] An outlet water pipe, installed at the top end on one side of the heat preservation shell;

[0015] An overhaul structure, arranged on one side of the heat preservation shell, used to open the heat preservation shell for internal overhaul and maintenance.

[0016] As a preferred technical solution of the present application, the cleaning component includes a mounting cover detachably installed on one side of the inlet water pipe, a motor fixed on one side of the mounting cover, a spiral blade plate installed on the other side of the mounting cover and connected to the motor, and a cleaning brush fixed on the outer side of the spiral blade plate.

[0017] Through the above technical solutions, foreign objects are blocked from entering the inside of the heat-conducting copper tube by the filter screen. The motor is started to drive the filter screen to clean the foreign objects on the surface of the cleaning brush. At the same time, the foreign objects move to the left and enter the inside of the sewage tank.

[0018] As a preferred technical solution of the present application, a plurality of groups of the cleaning brushes are fixed on the outer side of the spiral blade plate, and the plurality of groups of cleaning brushes are arranged in a spiral distribution on the outer side of the spiral blade plate.

[0019] Through the above technical solution, since the cleaning brushes are arranged in a spiral structure, the cleaning brushes push foreign objects to move leftward and enter the inside of the sewage tank during the cleaning process.

[0020] As a preferred technical solution of the present application, an external thread is provided on the outer side wall of the mounting cover, and an internal thread that cooperates with the external thread is provided inside the water inlet pipe.

[0021] Through the above technical solution, since the mounting cover and the water inlet pipe are connected by threads, the staff can disassemble and maintain the spiral vane and the cleaning brush by rotating the mounting cover.

[0022] As a preferred technical solution of the present application, the maintenance structure includes a hinge seat fixed on one side of the heat preservation shell, a baffle installed on one side of the hinge seat, a double-layer heat-insulating glass fixed inside the baffle, a sealing strip fixed at the middle position between the baffle and the heat preservation shell, a connecting seat fixed on one side of the baffle, a lead screw inserted inside the connecting seat, a rotating seat installed at the bottom end of the lead screw and connected to the heat preservation shell, and a rotating block sleeved outside the lead screw.

[0023] Through the above technical solution, by rotating the rotating block, the distance between the rotating block and the connecting seat is enlarged, the baffle is pulled to rotate around the hinge seat, and the heat preservation shell is opened.

[0024] As a preferred technical solution of the present application, an external thread is provided on the outer side wall of the lead screw, and an internal thread that cooperates with the external thread is provided inside the rotating block.

[0025] Through the above technical solution, it is convenient to move the position of the rotating block by rotating the rotating block, so as to fix or loosen the position of the baffle.

[0026] Compared with the prior art, the beneficial effects of the present utility model are:

[0027] In the solution of the present application:

[0028] In the solution of the present application, foreign objects are blocked from entering the inside of the heat-conducting copper tube by the filter screen, the motor is started to drive the filter screen to clean the foreign objects on the surface of the cleaning brush, and at the same time, the foreign objects move leftward and enter the inside of the sewage tank. Thus, the liquid filtering function of this device is realized, which is convenient for filtering the liquid entering the device and removing foreign objects such as rust, sediment, and microorganisms therein, preventing the heat-conducting copper tube from being blocked, extending the service life of the device, and enhancing the functionality of this device;

[0029] By rotating the rotating block, the distance between the rotating block and the connecting seat is enlarged, the baffle is pulled to rotate around the hinge seat, and the heat preservation shell is opened. Thus, the convenient maintenance function of this device is realized, which is convenient to open the heat preservation shell so that the staff can maintain the surfaces of the heat-conducting copper tube and the heat-conducting fins, and reduces the difficulty of device maintenance and repair. Description of the Drawings

[0030] Figure 1 One of the structural schematic diagrams of the present utility model;

[0031] Figure 2 Another structural schematic diagram of the present utility model;

[0032] Figure 3 Provided by the present application Figure 1 The enlarged partial sectional structural schematic diagram at position A in

[0033] Figure 4 The three-dimensional sectional structural schematic diagram of the filtering structure provided by the present application.

[0034] Reference numerals in the figures: 1, heat preservation shell; 2, filtering structure; 201, filter net; 202, spiral blade plate; 203, cleaning brush; 204, sewage tank; 205, cover plate; 206, mounting cover; 207, motor; 3, water inlet pipe; 4, maintenance structure; 401, hinge seat; 402, baffle; 403, double-layer heat-insulating glass; 404, sealing strip; 405, connecting seat; 406, rotating block; 407, lead screw; 408, rotating seat; 5, smoke inlet pipe; 6, smoke outlet; 7, demister; 8, heat-conducting copper pipe; 9, heat-conducting fin; 10, water outlet pipe. Specific embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0036] As Figures 1-4 shown, a gas boiler waste heat recovery device proposed in this embodiment includes a heat preservation shell 1, and also includes,

[0037] A smoke inlet pipe 5, installed at the bottom end of the heat preservation shell 1;

[0038] A smoke outlet 6, installed at the top end of the heat preservation shell 1, and a demister 7 is installed inside the smoke outlet 6;

[0039] A water inlet pipe 3, installed at the bottom end on one side of the heat preservation shell 1, and a heat-conducting copper pipe 8 is connected to one side of the water inlet pipe 3, and heat-conducting fins 9 are fixedly arranged at equal intervals on the outer side of the heat-conducting copper pipe 8;

[0040] A filtering structure 2, arranged on one side of the water inlet pipe 3, wherein the filtering structure 2 includes a filter net 201 fixed inside the water inlet pipe 3, a sewage tank 204 fixed at the bottom end of the water inlet pipe 3 and connected to the filter net 201, a cover plate 205 detachably installed at the bottom end of the sewage tank 204, and a cleaning assembly arranged on one side of the water inlet pipe 3;

[0041] The water outlet pipe 10 is installed at the top end of one side of the heat preservation shell 1;

[0042] The maintenance structure 4 is arranged on one side of the heat preservation shell 1 and is used to open the heat preservation shell 1 for internal maintenance.

[0043] As Figure 1 、 Figure 2 and Figure 4 shown, as a preferred embodiment, on the basis of the above method, further, the cleaning component includes a mounting cover 206 detachably installed on one side of the water inlet pipe 3, a motor 207 fixed on one side of the mounting cover 206, a spiral blade 202 installed on the other side of the mounting cover 206 and connected to the motor 207, and a cleaning brush 203 fixed on the outside of the spiral blade 202. A number of groups of cleaning brushes 203 are fixed on the outside of the spiral blade 202, and the number of groups of cleaning brushes 203 are arranged in a spiral distribution on the outside of the spiral blade 202. External threads are provided on the outer wall of the mounting cover 206, and internal threads matching the external threads are provided inside the water inlet pipe 3. The cold water entering the inside of the water inlet pipe 3 is filtered by the filter screen 201 to block foreign objects from entering the inside of the heat conduction copper pipe 8. The motor 207 is started to drive the spiral blade 202 to rotate, so that the spiral blade 202 drives the filter screen 201 to clean the foreign objects on the surface of the cleaning brush 203, preventing the filter screen 201 from being blocked. Since the cleaning brush 203 has a spiral structure, the cleaning brush 203 pushes the foreign objects to move leftward and enter the inside of the sewage tank 204 during the cleaning process. By removing the cover plate 205, the foreign objects inside the sewage tank 204 can be discharged, and the spiral blade 202 and the cleaning brush 203 can be disassembled and maintained by rotating the mounting cover 206.

[0044] As Figure 1 、 Figure 2 and Figure 3As shown, as a preferred embodiment, on the basis of the above method, further, the maintenance structure 4 includes a hinge seat 401 fixed on one side of the heat preservation shell 1, a baffle 402 installed on one side of the hinge seat 401, a double-layer heat-insulating glass 403 fixed inside the baffle 402, a sealing strip 404 fixed at the middle position between the baffle 402 and the heat preservation shell 1, a connecting seat 405 fixed on one side of the baffle 402, a lead screw 407 inserted inside the connecting seat 405, a rotating seat 408 installed at the bottom end of the lead screw 407 and connected to the heat preservation shell 1, and a rotating block 406 sleeved outside the lead screw 407. The outer wall of the lead screw 407 is provided with an external thread, and the inside of the rotating block 406 is provided with an internal thread that cooperates with the external thread. By rotating the rotating block 406, the rotating block 406 moves backward through the thread on the surface of the lead screw 407, expanding the distance between the rotating block 406 and the connecting seat 405, pushing the lead screw 407 to rotate around the rotating seat 408, causing the rotating block 406 to leave the inside of the connecting seat 405, pulling the baffle 402 to rotate around the hinge seat 401, and opening the heat preservation shell 1 to facilitate the cleaning and maintenance of the inside of the heat preservation shell 1. The sealing strip 404 seals between the baffle 402 and the heat preservation shell 1 to prevent flue gas leakage.

[0045] Specifically, when this gas boiler waste heat recovery device is in use: by connecting the smoke inlet pipe 5 to the gas pipeline, the flue gas is introduced into the inside of the heat preservation shell 1 through the smoke inlet pipe 5, cold water is injected into the inside of the heat conduction copper pipe 8 through the water inlet pipe 3, so that the cold water absorbs the heat in the flue gas through the heat conduction copper pipe 8 and the heat conduction fins 9, cools the flue gas and recovers the heat. Immediately afterwards, the hot water is discharged through the water outlet pipe 10, and the cold water entering the water inlet pipe 3 is filtered by the filtering structure 2.

[0046] The cold water entering the inside of the water inlet pipe 3 is filtered by the filter net 201 to block foreign objects from entering the inside of the heat conduction copper pipe 8. The motor 207 is started to drive the spiral blade 202 to rotate, so that the spiral blade 202 drives the filter net 201 to clean the foreign objects on the surface of the cleaning brush 203 to prevent the filter net 201 from being blocked. Since the cleaning brush 203 is in a spiral structure, the cleaning brush 203 pushes the foreign objects to move leftward and enter the inside of the sewage tank 204 during the cleaning process. By removing the cover plate 205, the foreign objects inside the sewage tank 204 can be discharged, and the installation cover 206 can be rotated to disassemble and maintain the spiral blade 202 and the cleaning brush 203;

[0047] By rotating the rotating block 406, the rotating block 406 moves backward along the thread on the surface of the lead screw 407, expanding the distance between the rotating block 406 and the connecting seat 405, pushing the lead screw 407 to rotate around the rotating seat 408, causing the rotating block 406 to leave the inside of the connecting seat 405, pulling the baffle 402 to rotate around the hinge seat 401, and opening the heat preservation shell 1 so as to facilitate the cleaning and maintenance of the inside of the heat preservation shell 1. The baffle 402 and the heat preservation shell 1 are sealed by the sealing strip 404 to prevent flue gas leakage.

[0048] The above embodiments are only used to illustrate the present invention rather than to limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific implementation manners. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the invention are covered by the scope of the claims of the present invention.

Claims

1. A waste heat recovery device for a gas boiler, comprising a heat insulation shell (1), characterized in that, It further includes a smoke inlet pipe (5), installed at the bottom end of the heat preservation shell (1); a smoke outlet (6), installed at the top end of the heat preservation shell (1), and a demister (7) is installed inside the smoke outlet (6); a water inlet pipe (3), installed at the bottom end on one side of the heat preservation shell (1), and a heat-conducting copper pipe (8) is connected to one side of the water inlet pipe (3), and heat-conducting fins (9) are fixedly arranged at equal intervals on the outer side of the heat-conducting copper pipe (8); a filtering structure (2), arranged on one side of the water inlet pipe (3), wherein the filtering structure (2) includes a filter net (201) fixed inside the water inlet pipe (3), a sewage tank (204) fixed at the bottom end of the water inlet pipe (3) and connected to the filter net (201), a cover plate (205) detachably installed at the bottom end of the sewage tank (204), and a cleaning component arranged on one side of the water inlet pipe (3); a water outlet pipe (10), installed at the top end on one side of the heat preservation shell (1); a maintenance structure (4), arranged on one side of the heat preservation shell (1), for opening the heat preservation shell (1) to perform internal maintenance.

2. The waste heat recovery device for a gas boiler according to claim 1, wherein, The cleaning component includes a mounting cover (206) detachably installed on one side of the water inlet pipe (3), a motor (207) fixed on one side of the mounting cover (206), a spiral blade (202) installed on the other side of the mounting cover (206) and connected to the motor (207), and a cleaning brush (203) fixed on the outer side of the spiral blade (202).

3. A waste heat recovery device for a gas boiler according to claim 2, characterized in that, A number of groups of the cleaning brushes (203) are fixed on the outer side of the spiral blade (202), and the number of groups of the cleaning brushes (203) are arranged in a spiral distribution on the outer side of the spiral blade (202).

4. A waste heat recovery device for a gas boiler according to claim 2, characterized in that, External threads are provided on the outer side wall of the mounting cover (206), and internal threads matching the external threads are provided inside the water inlet pipe (3).

5. A waste heat recovery device for a gas boiler according to claim 1, characterized in that, The maintenance structure (4) includes a hinge seat (401) fixed on one side of the heat preservation shell (1), a baffle (402) installed on one side of the hinge seat (401), a double-layer heat-insulating glass (403) fixed inside the baffle (402), a sealing strip (404) fixed at the middle position between the baffle (402) and the heat preservation shell (1), a connecting seat (405) fixed on one side of the baffle (402), a lead screw (407) inserted inside the connecting seat (405), a rotating seat (408) installed at the bottom end of the lead screw (407) and connected to the heat preservation shell (1), and a rotating block (406) sleeved on the outer side of the lead screw (407).

6. A waste heat recovery device for a gas boiler according to claim 5, characterized in that, External threads are provided on the outer side wall of the lead screw (407), and internal threads matching the external threads are provided inside the rotating block (406).

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