A natural gas heating system for a printing press

Abstract

This invention discloses a natural gas heating system for a printing press, comprising: a combustion chamber, a fan assembly, a flame shield, and a combustion nozzle. The combustion chamber has an air inlet and an air outlet; the fan assembly is connected to the air outlet; the outer peripheral wall of the flame shield has evenly distributed through holes, and the flame shield is suspended in the combustion chamber, forming an annular mixing gap between the outer peripheral wall of the flame shield and the inner peripheral wall of the combustion chamber; the combustion nozzle is located in one end of the flame shield, and the spray direction of the combustion nozzle is along the axial direction of the flame shield and towards the other end of the flame shield; a combustion gap is formed between the end of the flame shield away from the combustion nozzle and the inner wall of the combustion chamber on the opposite side; the air outlet is located on the wall of the combustion chamber on the outer peripheral side of the combustion gap; the air inlet is located on the wall of the combustion chamber on the outer peripheral side of the flame shield near the combustion nozzle, improving the mixing effect to improve the efficiency of natural gas combustion.

Description

Technical Field

[0001] This invention relates to the technical field of printing presses, and particularly to a natural gas heating system for a printing press. Background Technology

[0002] In printing presses, hot air is typically used to dry the paper after printing. Natural gas heating systems are generally used to generate this hot air. However, current natural gas heating systems for printing presses have the following problems: natural gas and fresh air entering the combustion chamber are difficult to mix completely during combustion, resulting in hot air carrying soot and affecting printing quality. Summary of the Invention

[0003] The purpose of this invention is to provide a natural gas heating system for a printing press to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] This invention provides a natural gas heating system for a printing press, comprising: a combustion chamber, a fan assembly, a flame shield, and a combustion nozzle. The combustion chamber has an air inlet and an air outlet; the fan assembly is connected to the air outlet; the outer peripheral wall of the flame shield has evenly distributed through holes, and the flame shield is suspended in the combustion chamber, with an annular mixing gap formed between the outer peripheral wall of the flame shield and the inner peripheral wall of the combustion chamber; the combustion nozzle is disposed in one end of the flame shield, and the spray direction of the combustion nozzle is along the axial direction of the flame shield and towards the other end of the flame shield; a combustion gap is formed between the end of the flame shield away from the combustion nozzle and the inner wall of the combustion chamber on the opposite side.

[0006] The air outlet is located on the wall of the combustion chamber on the outer periphery of the combustion gap; the air inlet is located on the wall of the combustion chamber on the outer periphery of the fire shield near the end of the combustion nozzle.

[0007] The beneficial effects of this invention are as follows: When in use, the fan assembly is started, so that fresh air from outside is drawn into the mixing gap of the combustion chamber through the air inlet. At the same time, natural gas is ejected at high speed along the axial direction of the flame shield tube through the combustion nozzle. The high-speed natural gas flows in the flame shield tube, creating a pressure difference between the inner and outer circumferences of the flame shield tube. Fresh air from the outer circumference of the flame shield tube is drawn into the flame shield tube through the through hole and mixed with the natural gas. Then it is ejected into the combustion gap for mixed combustion. Some of the gas in the combustion gap can flow back into the mixing gap and be drawn into the flame shield tube through the through hole for mixed combustion again, improving the mixing effect and thus improving the efficiency of natural gas combustion. The high-temperature gas flows out through the air outlet into the printing press.

[0008] The mixing gap in this design is annular and is set around the outer periphery of the fire shield, allowing the gas to flow in an annular manner within the mixing gap. This also reduces the air resistance of the intake air, resulting in a better mixing effect.

[0009] As a further improvement to the above technical solution, the combustion chamber is provided with a return air inlet, which is located on the outer periphery of the combustion chamber near the end of the fire shield tube close to the combustion nozzle.

[0010] This solution also includes a return air vent, through which the dried gas can flow back into the combustion chamber for mixing and heating, thereby improving heating efficiency and achieving energy saving and emission reduction.

[0011] As a further improvement to the above technical solution, the return air inlet and the air inlet are arranged opposite to each other on both sides of the fireproof tube.

[0012] The dried gas and fresh air from the outside can enter the mixing gap simultaneously from opposite sides of the combustion chamber for mixing, and then be drawn into the flame shield.

[0013] As a further improvement to the above technical solution, the air inlet is provided with a filter grille, and a sealing plate for adjusting the air intake volume of the air inlet is slidably installed on the outer side of the air inlet. Laterally extending sliding grooves are provided on both sides of the bottom of the air inlet, and the two side edges of the sealing plate are respectively slidably engaged with the two sliding grooves.

[0014] The filter grille in this solution is used to prevent large particles from entering the combustion chamber, avoid clogging of the pores, extend service life, reduce maintenance frequency, and ensure mixing effect. The opening of the air inlet can be adjusted by pushing the sealing plate according to the required fresh air volume. When the printing press is not working or when higher hot air is needed to circulate and heat the return air separately, this solution can completely block the air inlet with the sealing plate.

[0015] As a further improvement to the above technical solution, the air inlet is located at the bottom of the combustion chamber, and an overhead bracket is provided on the bottom side of the combustion chamber.

[0016] The air inlet of this design is located at the bottom of the combustion chamber, which can effectively prevent foreign objects from falling into the combustion chamber from the air inlet, while also keeping the air inlet unobstructed. The overhead bracket facilitates the installation and fixation of the combustion chamber, which can be supported by the overhead bracket to create an air intake gap at the bottom of the combustion chamber.

[0017] As a further improvement to the above technical solution, two air outlets are provided, and the two air outlets are arranged opposite each other on both sides of the combustion chamber in the transverse direction.

[0018] It also includes a cover that can be detachably sealed to the air outlet.

[0019] The combustion chamber of this design is equipped with two air outlets, which enhances the flexibility of the natural gas heating system installation. When multiple combustion chambers are set up, two adjacent combustion chambers can use a single dual-inlet fan assembly, while the other air outlets are sealed with covers.

[0020] As a further improvement to the above technical solution, the outlet of the fan assembly is connected to an air outlet pipe, the air outlet pipe is provided with at least one hot air outlet, and the hot air outlet is equipped with a first air valve.

[0021] The airflow rate at each hot air outlet can be adjusted via the first air valve.

[0022] As a further improvement to the above technical solution, it also includes an exhaust pipe and a return air pipe. The exhaust pipe is equipped with a third air valve. One end of the return air pipe is connected to the exhaust pipe upstream of the third air valve, and the other end of the return air pipe is connected to the return air inlet. The return air pipe is equipped with a second air valve.

[0023] This solution regulates the exhaust volume of the exhaust pipe through the third air valve. When it is necessary to circulate and heat the return air, the third air valve can be closed directly and the second air valve can be opened. The gas from the exhaust pipe flows back to the combustion chamber through the return air pipe. Alternatively, the return air volume and exhaust volume can be controlled by adjusting the opening of the third air valve and the second air valve.

[0024] As a further improvement to the above technical solution, it also includes an exhaust manifold, wherein the exhaust pipe is connected to the exhaust manifold.

[0025] This solution connects multiple exhaust pipes through a main exhaust pipe to achieve centralized recycling and treatment.

[0026] As a further improvement to the above technical solution, the end of the fire shield near the combustion nozzle is fixed to the inner wall of the combustion chamber.

[0027] During use, the combustion nozzle is connected to the natural gas pipeline, while the flame shield is directly fixed to the inner wall of the combustion chamber. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0029] Figure 1 This is a schematic diagram of the upper structure of an embodiment of the natural gas heating system provided by the present invention.

[0030] Figure 2 This is a side sectional view of an embodiment of the natural gas heating system provided by the present invention;

[0031] Figure 3 This is a schematic diagram of the lower side of an embodiment of the natural gas heating system provided by the present invention. Detailed Implementation

[0032] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0035] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0036] Reference Figures 1-3 The natural gas heating system of the printing press of the present invention is provided in the following embodiment:

[0037] The natural gas heating system in this embodiment includes a combustion chamber 100, a fan assembly 200, a fire shield 300, and a combustion nozzle 500.

[0038] The combustion chamber 100 is provided with an air inlet 110 and an air outlet 120. The fan assembly 200 is connected to the air outlet 120. In this embodiment, the fan assembly 200 is an induced draft fan unit. When the fan assembly 200 is started, it draws air from the air outlet 120, while fresh air from outside is drawn into the combustion chamber 100 from the air inlet 110.

[0039] like Figure 2 As shown, in this embodiment, the fire shield 300 is suspended inside the combustion chamber 100. The fire shield 300 extends laterally in this embodiment. The outer peripheral wall of the fire shield 300 is evenly distributed with a plurality of through holes 310. A mixing gap 400 is provided between the outer peripheral wall of the fire shield 300 and the inner peripheral wall of the combustion chamber 100. The mixing gap 400 is annular.

[0040] In this embodiment, the front end of the fire shield 300 is fixedly connected to the front inner wall of the combustion chamber 100. In other embodiments, the fire shield 300 may be installed in the combustion chamber 100 in other ways.

[0041] The combustion nozzle 500 is located at the front end of the fire shield 300 and sprays backward. A combustion gap 600 is provided between the rear end of the fire shield 300 and the rear inner wall of the combustion chamber 100, so that the combustion gap 600 is connected to the mixing gap 400.

[0042] In this embodiment, the combustion nozzle 500 is fixed to the front inner wall of the combustion chamber 100. During use, the combustion nozzle 500 is connected to the natural gas pipeline.

[0043] In this embodiment, the air outlet 120 is disposed on the wall of the combustion chamber 100 on the outer periphery of the combustion gap 600, while the air inlet 110 is disposed on the wall of the combustion chamber 100 on the outer periphery of the end of the fire shield 300 near the combustion nozzle 500.

[0044] In this embodiment, the inlet of the fan assembly 200 is connected to the air outlet 120, and the outlet of the fan assembly 200 is provided with an air outlet pipe 210. The fan assembly 200 is connected to the drying chamber of the printing press through the air outlet pipe 210, and the hot air from the combustion chamber 100 enters the drying chamber of the printing press through the air outlet pipe 210 for drying.

[0045] When in use, the fan assembly 200 is started, allowing fresh air from outside to be drawn into the mixing gap 400 of the combustion chamber 100 through the air inlet 110. At the same time, natural gas is ejected at high speed along the axial direction of the flame shield 300 through the combustion nozzle 500. The high-speed natural gas flows in the flame shield 300, creating a pressure difference between the inner and outer circumferences of the flame shield 300. Fresh air from the outer circumference of the flame shield 300 is drawn into the flame shield 300 through the through hole 310 and mixed with the natural gas. Then, it is ejected into the combustion gap 600 for mixing and combustion. Some of the gas in the combustion gap 600 can flow back into the mixing gap 400 and be drawn into the flame shield 300 through the through hole 310 for mixing again, improving the mixing effect and thus improving the efficiency of natural gas combustion. The flame shield 300 provides a flame protection effect.

[0046] In this embodiment, the mixing gap 400 is annular and is arranged around the outer periphery of the fire shield 300, so that the gas can flow in an annular manner in the mixing gap 400, while also reducing the wind resistance of the incoming air and making the mixing effect better.

[0047] In this embodiment, the air outlet 210 is provided with two hot air outlets 211. The hot air outlets 211 are connected to the drying chamber corresponding to the printing machine. Each hot air outlet 211 is equipped with a first air valve 212, which can adjust the air volume of each hot air outlet 211.

[0048] Furthermore, the combustion chamber 100 of this embodiment is provided with a return air inlet 130, which is located on the wall of the combustion chamber 100 on the outer periphery of the end of the fire shield 300 near the combustion nozzle 500.

[0049] This embodiment also includes an exhaust pipe 800 and a return air pipe 810. The exhaust pipe 800 is equipped with a third air valve 820. One end of the return air pipe 810 is connected to the exhaust pipe 800 upstream of the third air valve 820, and the other end of the return air pipe 810 is connected to the return air inlet 130. In this embodiment, the return air pipe 810 is equipped with a second air valve 811, and the exhaust pipe 800 is connected to the drying chamber of the printing press.

[0050] The dried gas can be returned to the combustion chamber 100 through the return air inlet 130 for mixing and heating, thereby improving heating efficiency and achieving energy saving and emission reduction.

[0051] In this embodiment, the exhaust volume of the exhaust pipe 800 is adjusted by the third air valve 820. When it is necessary to circulate and heat the return air, the third air valve 820 can be closed directly and the second air valve 811 can be opened. The gas from the exhaust pipe 800 flows back to the combustion chamber 100 through the return air pipe 810. Alternatively, the return air volume and exhaust volume can be controlled by adjusting the opening of the third air valve 820 and the second air valve 811.

[0052] In this embodiment, the return air inlet 130 and the air inlet 110 are arranged opposite to each other on the wall of the combustion chamber 100. The dried gas and the fresh air from the outside can enter the mixing gap 400 from opposite sides of the combustion chamber 100 at the same time for mixing, and then be drawn into the fire shield 300.

[0053] Specifically, in this embodiment, the air inlet 110 is located at the bottom of the combustion chamber 100, while the return air inlet 130 is located at the top of the combustion chamber 100. This can effectively prevent foreign objects from falling from the air inlet 110 into the combustion chamber 100, while also keeping the air inlet 110 unobstructed.

[0054] An overhead bracket 140 is provided on the bottom side of the combustion chamber 100. The overhead bracket 140 is used to facilitate the installation and fixing of the combustion chamber 100. The combustion chamber 100 can be supported by the overhead bracket 140 so that an air intake gap is formed at the bottom of the combustion chamber 100.

[0055] In this embodiment, the air inlet 110 is provided with a filter grille 111. The filter grille 111 is used to prevent large particles from entering the combustion chamber 100, avoid the through holes 310 from being blocked, extend the service life, reduce the number of maintenance times, and ensure the mixing effect.

[0056] In this embodiment, the air inlet 110 is provided with a sealing plate 112. The sealing plate 112 is used to adjust the air intake volume of the air inlet 110. Specifically, a horizontally extending slide groove 113 is provided on both sides of the bottom of the air inlet 110, and the two side edges of the sealing plate 112 are slidably connected to the two slide grooves 113 respectively.

[0057] In this embodiment, the opening of the air inlet 110 can be adjusted by pushing the sealing plate 112 according to the required fresh air volume. When the printing press is not working or when higher hot air is needed to circulate and heat the return air separately, the air inlet 110 can be completely blocked by the sealing plate 112.

[0058] Furthermore, in this embodiment, the combustion chamber 100 is provided with two air outlets 120, which are arranged on both sides of the combustion chamber 100 in a left-right orientation. This enhances the flexibility of the natural gas heating system installation. When multiple combustion chambers 100 are provided, two adjacent combustion chambers 100 can use a single dual-inlet fan assembly 200, while the other air outlets 120 are blocked by a cover 700.

[0059] This embodiment also includes a main exhaust pipe 900, and the exhaust pipes 800 are connected to the main exhaust pipe 900. Multiple exhaust pipes 800 are connected through the main exhaust pipe 900 to achieve centralized recycling and treatment.

[0060] In some embodiments, a screen is provided inside the return air duct 810 for filtering the return air.

[0061] In addition, temperature sensors can be installed at the air outlet 120 and the return air outlet 130 to detect the temperature of the hot air and the return air, and air volume sensors can be installed at the air outlet 120, the return air outlet 130, the air inlet 110 and the hot air outlet 211 to realize the built-in control.

[0062] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A natural gas heating system for a printing press, characterized by: include: The combustion chamber (100) is provided with an air inlet (110) and an air outlet (120). A fan assembly (200) is connected to the air outlet (120); The fire shield (300) has through holes (310) evenly distributed on its outer peripheral wall. The fire shield (300) is suspended in the combustion chamber (100). An annular mixing gap (400) is formed between the outer peripheral wall of the fire shield (300) and the inner peripheral wall of the combustion chamber (100). A combustion nozzle (500) is disposed in one end of the fire shield (300). The injection direction of the combustion nozzle (500) is along the axial direction of the fire shield (300) and toward the other end of the fire shield (300). A combustion gap (600) is formed between the end of the fire shield (300) away from the combustion nozzle (500) and the inner wall of the combustion chamber (100) on the opposite side. The combustion gap (600) is connected to the mixing gap (400). The air outlet (120) is located on the wall of the combustion chamber (100) on the outer periphery of the combustion gap (600); The air inlet (110) is located on the wall of the combustion chamber (100) on the outer periphery of the fire shield (300) near the end of the combustion nozzle (500); The combustion chamber (100) is provided with a return air inlet (130), which is located on the wall of the combustion chamber (100) on the outer periphery of the fire shield (300) near the end of the combustion nozzle (500). The return air inlet (130) and the air inlet (110) are arranged opposite to each other on both sides of the fire shield (300); The air inlet (110) is located at the bottom of the combustion chamber (100), and the bottom side of the combustion chamber (100) is provided with an overhead bracket (140). The air outlet (120) is provided in two places, and the two air outlets (120) are arranged opposite each other on both sides of the combustion chamber (100) laterally; It also includes a cover (700) that detachably seals the air outlet (120). The fan assembly (200) is started, so that fresh air from the outside is drawn into the mixing gap (400) of the combustion chamber (100) through the air inlet (110). At the same time, natural gas is ejected at high speed along the axial direction of the fire shield (300) through the combustion nozzle (500). The high-speed natural gas flows in the fire shield (300), so that a pressure difference is formed between the inner and outer circumferences of the fire shield (300). Fresh air from the outer circumference of the fire shield (300) is drawn into the fire shield (300) through the through hole (310) and mixed with natural gas. Then it is ejected into the combustion gap (600) for mixed combustion. Some of the gas in the combustion gap (600) flows back into the mixing gap (400) and is drawn into the fire shield (300) through the through hole (310) for mixed combustion again.

2. The natural gas heating system according to claim 1, characterized in that: The air inlet (110) is provided with a filter grille (111). A sealing plate (112) for adjusting the air intake volume of the air inlet (110) is slidably installed on the outside of the air inlet (110). Laterally extending grooves (113) are provided on both sides of the bottom of the air inlet (110). The two sides of the sealing plate (112) are respectively slidably engaged with the two grooves (113).

3. The natural gas heating system according to claim 1, characterized in that: The outlet of the fan assembly (200) is connected to an air outlet pipe (210), the air outlet pipe (210) is provided with at least one hot air outlet (211), and the hot air outlet (211) is equipped with a first air valve (212).

4. The natural gas heating system according to claim 1, characterized in that: It also includes an exhaust pipe (800) and a return air pipe (810). The exhaust pipe (800) is equipped with a third air valve (820). One end of the return air pipe (810) is connected to the exhaust pipe (800) upstream of the third air valve (820). The other end of the return air pipe (810) is connected to the return air inlet (130). The return air pipe (810) is equipped with a second air valve (811).

5. The natural gas heating system according to claim 4, characterized in that: It also includes an exhaust manifold (900), to which the exhaust pipe (800) is connected.

6. The natural gas heating system according to claim 1, characterized in that: The end of the fire shield (300) near the combustion nozzle (500) is fixed to the inner wall of the combustion chamber (100).

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