An automatic air-fuel ratio adjustment device for the combustion of high-quality steel

Abstract

The present invention belongs to the technical field of air-fuel ratio adjustment devices, and discloses an automatic air-fuel ratio adjustment device for the combustion of high-quality steel, which includes a proportional valve installed on a gas pipe. An adjustment pipe is connected to the proportional valve, and the end of the adjustment pipe away from the proportional valve communicates with the air pipe. A circulation pipe is connected to the air pipe at a position corresponding to the adjustment pipe, and a regulating valve is installed at the connection position of the air pipe and the circulation pipe. The regulating valve is used to switch the air path to the circulation pipe; the automatic air-fuel ratio adjustment device provided by the present invention connects a circulation pipe at a position close to the adjustment pipe on the air pipe and sets a regulating valve. In the early stage of air delivery, the regulating valve connects the air pipe and the circulation pipe. When the air flow is stable, the regulating valve switches the air path to the outlet pipe of the air pipe, ensuring that the air pressure generated at the position where the air pipe just passes through the adjustment pipe can push the proportional valve to act, so that the air and gas can reach the best ratio at the inlet stage.

Description

Technical Field

[0001] The invention relates to the technical field of air-fuel ratio regulating devices, and in particular discloses an automatic regulating device for the air-fuel ratio of fine steel combustion. Background Art

[0002] During the annealing process of steel, it is necessary to ensure that the air and gas provided to the burner are in an optimal combustion ratio. Firstly, this is to prevent excessive air from causing oxidation reactions in the steel in the annealing furnace; secondly, it is to prevent excessive gas from causing incomplete combustion. The existing regulation method is to install an air-fuel ratio valve on the gas inlet pipe, connect a branch pipe connected to the air-fuel ratio valve to the air pipeline, and feed back the pressure changes in the air pipe to the air-fuel ratio valve to adjust the gas intake volume.

[0003] For example, the patent with announcement number CN219796240U, with announcement date of 2023-10-03, discloses a new air-fuel proportioning valve, including a valve body, which is divided into a gas chamber and a pressure balancing chamber by a partition, and the gas chamber is divided into a gas inlet chamber and a gas outlet chamber by a valve core, and the pressure balancing chamber is divided into an air pressure chamber and a gas pressure chamber by a diaphragm. A first pressure regulating pipe is provided on the valve body, and the outlet of the first pressure regulating pipe is located in the gas outlet chamber, a second pressure regulating port is provided on the gas pressure chamber, a plug is provided in the gas pressure chamber, and an air inlet is provided on the air pressure chamber, and the air inlet is used to install an air inlet pipe connecting the air pressure chamber with the air pipe.

[0004] The disadvantage of the existing air-fuel ratio adjustment mechanism, including the above-mentioned patent, is that in the early stage of air input, since the air-fuel ratio valve needs to reach a certain pressure before it can be adjusted, only air is introduced into the air pipe during this stage, which will result in a large amount of air in the early mixed gas and too little fuel gas, resulting in ignition failure. In addition, the excessive air introduced into the annealing furnace will destroy the protective atmosphere in the annealing furnace. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic air-fuel ratio regulating device for high-quality steel combustion.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A high-quality steel combustion air-fuel ratio automatic adjustment device, which is used for automatically adjusting the fluid ratio in the air pipe and the gas pipe, includes a proportional valve installed on the gas pipe, the proportional valve is connected to a regulating pipe, the end of the regulating pipe away from the proportional valve is connected to the air pipe, a circulation pipe is connected to the position of the air pipe corresponding to the regulating pipe, and a regulating valve is installed at the connection position between the air pipe and the circulation pipe, the regulating valve is used to switch the air path to the circulation pipe to disconnect the underpressure state of the air pipe and disconnect the circulation pipe to open the working state of the air pipe.

[0008] For the above air-fuel ratio automatic adjustment device, a pressure relief pipe is connected to the proportional valve. When the air pipe is connected to the circulation pipe, the proportional valve connects the gas pipe to the pressure relief pipe. When the air pipe is disconnected from the circulation pipe, the proportional valve disconnects the connection between the gas pipe and the pressure relief pipe.

[0009] For the above air-fuel ratio automatic adjustment device, the proportional valve includes a housing. An air inlet chamber and an air outlet chamber are provided inside the housing, and a first adjusting member is provided inside the housing for controlling the connection and disconnection between the air inlet chamber and the air outlet chamber. The pressure relief pipe is connected to the air inlet chamber, and a second adjusting member for controlling the connection and disconnection between the air inlet chamber and the pressure relief pipe is also provided inside the housing.

[0010] For the above air-fuel ratio automatic adjustment device, the first adjusting member includes a first rod provided inside the housing. A valve disc is sleeved in the middle of the first rod. A spring for maintaining the valve disc to block the connection port between the air inlet chamber and the air outlet chamber is provided inside the housing. An air chamber is provided at the lower part of the housing, and an elastic piece is provided at a position corresponding to the lower end of the first rod on the air chamber. The elastic piece is fixedly connected to the lower end of the first rod, and the edge position of the elastic piece is fixedly connected to the housing. The adjusting pipe is connected to the air chamber.

[0011] For the above air-fuel ratio automatic adjustment device, the regulating valve includes a valve body. A first valve member and a second valve member are installed inside the valve body. When the first valve member is driven to rotate, it switches the air path to the circulation pipe. When the second valve member is driven to rotate, it adjusts the flow rate of the gas flowing through the connection position of the regulating pipe on the air pipe.

[0012] For the above air-fuel ratio automatic adjustment device, the first valve member includes a first valve core rotatably installed on the valve body. A first valve hole and a second valve hole are provided on the first valve core. The first valve hole is provided through the first valve core in the radial direction, the second valve hole is provided perpendicular to the first valve hole, and the second valve hole penetrates from the center point of the first valve core to the outer wall of the first valve core.

[0013] For the above air-fuel ratio automatic adjustment device, the second valve member includes a second valve core rotatably installed inside the first valve core. The second valve core includes an arc-shaped plate capable of blocking either the first valve hole or the second valve hole. The arc-shaped plate is fixedly connected with a blocking block, and the blocking block is rotatably connected with the first valve core.

[0014] For the above air-fuel ratio automatic adjustment device, a first driving member and a second driving member are installed outside the valve body. The first driving member drives the first valve core to rotate, and the second driving member drives the second valve core to rotate.

[0015] For the above air-fuel ratio automatic adjustment device, the first valve core is in transmission connection with the second adjusting member through a transmission member. When the first driving member drives the first valve core to rotate, it also drives the second adjusting member to control the connection and disconnection between the air inlet chamber and the pressure relief pipe.

[0016] In the above-mentioned air-fuel ratio automatic adjustment device, the second adjustment member includes a ring rotatably mounted on the outer shell, and a through hole is opened on the ring.

[0017] In the above technical solution, the air-fuel ratio automatic adjustment device provided by the present invention is connected to a circulation pipe at a position close to the adjustment pipe on the air pipe, and a regulating valve is set at the connection position between the air pipe and the circulation pipe. In the early stage of air transportation in the air pipe, the regulating valve connects the air pipe with the circulation pipe, and this part of the air with unstable flow enters the circulation pipe through the regulating valve. When the air flow is stable or the pressure generated by the air flow can drive the proportional valve to operate, the air path is switched through the regulating valve to ensure that the air pressure generated in the regulating pipe by the air flow at the connection of the adjustment pipe in the air pipe can drive the proportional valve to operate, so as to achieve the purpose of air and gas being able to be introduced into the burner of the annealing furnace in the optimal ratio at the beginning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the front structure of an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the side structure provided by an embodiment of the present invention;

[0021] Figure 3 A partial cross-sectional view of a proportional valve provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the first driving member and the second driving member provided in an embodiment of the present invention being installed on the valve body;

[0023] Figure 5 A schematic diagram of the internal structure of the valve body when the first valve core is at a first angle provided by an embodiment of the present invention;

[0024] Figure 6 A cross-sectional view of a first valve core provided in an embodiment of the present invention;

[0025] Figure 7 An enlarged schematic diagram of the first valve core provided by an embodiment of the present invention when it is at a second angle;

[0026] Figure 8 A top view of a ring provided in an embodiment of the present invention;

[0027] Figure 9A schematic diagram of the internal structure of the valve body when the first valve core is at a second angle provided by an embodiment of the present invention;

[0028] Figure 10 The embodiment of the present invention provides Figure 4 Enlarged schematic diagram of point A in the middle.

[0029] Description of reference numerals:

[0030] 1. Air pipe; 11. Inlet pipe; 12. Outlet pipe; 13. Branch pipe; 2. Gas pipe; 21. First pipe; 22. Second pipe; 3. Proportional valve; 31. Housing; 311. Upper housing; 312. Lower housing; 3121. Small hole; 32. Inlet cavity; 33. Outlet cavity; 34. First adjusting member; 341. First rod; 342. Valve plate; 343. Spring; 344. Elastic plate; 35. Second adjusting member; 351. Ring; 352. Through hole; 36. Air cavity; 4. Regulating pipe; 5. Regulating valve; 51. Valve body; 52. First valve core; 521. First valve hole; 522. Second valve hole; 523. Cylinder; 53. Second valve core; 531. Arc plate; 532. Stopper; 55. Mounting bracket; 551. First motor; 552. First gear; 553. Second gear; 554. Second motor; 6. Circulating pipe; 7. Pressure relief pipe; 8. Transmission member; 81. Rotating shaft; 82. Spur gear; 83. First bevel gear; 84. Second bevel gear. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] In the description of the present invention, unless otherwise specified, “multiple” means two or more; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head”, “tail”, etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms “connected” and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1-10As shown, an embodiment of the present invention provides an automatic air-fuel ratio adjustment device for fine steel combustion, which is used for automatically adjusting the fluid ratio in the air pipe 1 and the gas pipe 2, including a proportional valve 3 installed on the gas pipe 2, the proportional valve 3 is connected to a regulating pipe 4, the regulating pipe 4 is connected to the air pipe 1 at one end away from the proportional valve 3, a circulation pipe 6 is connected to the position of the air pipe 1 corresponding to the regulating pipe 4, and a regulating valve 5 is installed at the connection position between the air pipe 1 and the circulation pipe 6, the regulating valve 5 is used to switch the air path to the circulation pipe 6 to disconnect the underpressure state of the air pipe 1 and disconnect the circulation pipe 6 to unblock the working state of the air pipe 1.

[0034] Specifically, the air-fuel ratio automatic regulating device can adjust the opening and closing degree of the proportional valve 3 according to the air flow in the air pipe 1 and the pressure generated in the regulating pipe 4, so as to control the gas flow and thus automatically adjust the ratio of air and gas. The head ends of both the air pipe 1 and the gas pipe 2, i.e., the air inlet ends, are provided with air pumps. For the convenience of description, the air pump provided at the head end of the air pipe 1 is referred to as the air pump, and the air pump provided at the head end of the gas pipe 2 is referred to as the gas pump; Figure 1 and Figure 2 As shown, the air-fuel ratio automatic adjustment device includes a proportional valve 3 installed on the air pipe 1, and a regulating pipe 4 is connected to the proportional valve 3. The end of the regulating pipe 4 away from the proportional valve 3 is connected to the air pipe 1. In addition, the air pipe 1 is connected to a circulation pipe 6. During implementation, the air needs to be pre-treated, such as filtered, before it can be used for combustion. The end of the circulation pipe 6 away from the air pipe 1 can be connected to an air tank for storing treated air; a regulating valve 5 is installed at the connection position between the air pipe 1 and the circulation pipe 6, wherein the proportional valve 3 can adopt an existing air-fuel proportional valve, and the regulating valve 5 can adopt an existing electrically controlled three-way valve. This is an existing technology and can be directly applied without further explanation.

[0035] When the air-fuel ratio automatic adjustment device is started, the air flow path is first switched to the circulation pipe 6 through the regulating valve 5, and air is introduced into the air pipe 1 through the air pump. For the convenience of description, the part of the air pipe 1 between the regulating valve 5 and the air pump is the air inlet pipe 11, and the part of the air pipe 1 between the regulating valve 5 and the burner in the annealing furnace is the air outlet pipe 12. In actual use, in order to facilitate the introduction of air into multiple burners, such as Figure 1 and Figure 2As shown in the figure, the end of the air outlet pipe 12 far from the air inlet pipe 11 can be connected to the branch pipe 13, so as to facilitate the delivery of air to multiple burners through the branch pipe 13; at the initial stage when the air pump starts, according to the transient flow phenomenon in fluid dynamics, because the gas has inertia, when the air pump starts to work, it applies a force to the air, causing the static air to start accelerating. After a period of time (depending on factors such as the geometric structure of the pipeline, the acceleration period can range from a few seconds to several minutes), during this stage, the air delivered by the air pump to the air inlet pipe 11 enters the circulation pipe 6 through the regulating valve 5, that is, the underpressure state of the air pipe 1 is disconnected. When the gas flow rate in the air inlet pipe 11 tends to be stable or the pressure generated by the air flow rate can drive the proportional valve 3 to act, switch the direction of the regulating valve 5 so that all the air flows through the regulating valve 5 to the air outlet pipe 12, that is, disconnect the working state where the circulation pipe 6 is unobstructed and the air pipe 1 is open. At this time, the air flowing to the air outlet pipe 12 generates pressure in the regulating pipe 4, driving the proportional valve 3 to act and controlling the gas flow rate; obviously, for the switching timing of the regulating valve 5, the time can be set according to factors such as the geometric structure of the air inlet pipe 11, or a flow meter can be installed at a position close to the regulating valve 5 in the air inlet pipe 11 to monitor the air flow rate in the air inlet pipe 11. When the air flow rate in the air inlet pipe 11 reaches stability or the pressure generated by the air flow rate can drive the proportional valve 3 to act, control the regulating valve 5 to switch the air path.

[0036] The air-fuel ratio automatic adjustment device provided by the present invention connects the circulation pipe 6 at a position close to the regulating pipe 4 on the air pipe 1, and sets the regulating valve 5 at the connection position of the air pipe 1 and the circulation pipe 6. In the early stage of air delivery in the air pipe 1, the regulating valve 5 connects the air pipe 1 and the circulation pipe 6, and this part of the air with unstable flow rate enters the circulation pipe through the regulating valve 5. When the air flow rate is stable or the pressure generated by the air flow rate can drive the proportional valve 3 to act, the air path is switched through the regulating valve 5 to ensure that the air pressure generated by the air flow rate at the connection of the regulating pipe 4 in the air pipe 1 can push the proportional valve 3 to act, achieving the purpose of allowing air and gas to enter the burners of the annealing furnace in the best proportion at the beginning stage.

[0037] Furthermore, a pressure relief pipe 7 is connected to the proportional valve 3. When the air pipe 1 is connected to the circulation pipe 6, the proportional valve 3 connects the gas pipe 2 to the pressure relief pipe 7. When the air pipe 1 is disconnected from the circulation pipe 6, the proportional valve 3 disconnects the gas pipe 2 from the pressure relief pipe 7. In this case, all the air introduced through the air inlet pipe 11 enters the air outlet pipe 12. At this time, since the proportional valve 3 disconnects the gas pipe 2 from the pressure relief pipe 7, the gas delivered by the gas pump to the first pipe 21 can form sufficient gas pressure in the air inlet chamber 32. The air entering the air outlet pipe 12 changes the air pressure in the regulating pipe 4, and cooperates with the gas pressure in the air inlet chamber 32 to prompt the proportional valve 3 to operate, so that the gas can be delivered to the burner through the proportional valve 3 and mixed with the air to form a mixture with an optimal air-fuel ratio.

[0038] Furthermore, the proportional valve 3 includes a shell 31, in which an air inlet chamber 32 and an air outlet chamber 33 are provided, and a first adjusting member 34 is provided in the shell 31. The first adjusting member 34 is used to control the connection and disconnection between the air inlet chamber 32 and the air outlet chamber 33. The pressure relief pipe 7 is connected to the air inlet chamber 32. A second adjusting member 35 is also provided in the shell 31 for controlling the connection and disconnection between the air inlet chamber 32 and the pressure relief pipe 7.

[0039] Optionally, the first adjusting member 34 includes a first rod 341 arranged in the outer shell 31, a valve plate 342 is mounted on the middle part of the first rod 341, a spring 343 is provided in the outer shell 31 to maintain the valve plate 342 to block the connection port between the air inlet chamber 32 and the air outlet chamber 33, an air cavity 36 is provided at the lower part of the outer shell 31, an elastic plate 344 is provided on the air cavity 36 at a position corresponding to the lower end of the first rod 341, the elastic plate 344 is fixedly connected to the lower end of the first rod 341, and the edge position of the elastic plate 344 is fixedly connected to the outer shell 31, and the adjusting tube 4 is connected to the air cavity 36.

[0040] Specifically, in actual use, in order to ensure that the gas can be introduced in time, the gas pump is also started when the air pump is started. For the convenience of description, the part of the gas pipe 2 between the gas pump and the proportional valve 3 is the first pipe 21, and the part of the gas pipe 2 between the proportional valve 3 and the burner is the second pipe 22. At the initial stage of the air pump startup, that is, the stage when the intake pipe 11 is connected to the circulation pipe 6, the gas pump continuously introduces gas into the first pipe 21, which causes the gas pressure in the first pipe 21 to gradually increase during this stage. According to the principles of fluid mechanics, excessive gas pressure will cause the gas to flow too fast to the second pipe 22 when the proportional valve 3 connects the second pipe 22, thereby causing the gas ratio in the air-fuel mixture to be too high, resulting in incomplete combustion. In this embodiment, the main structure of the proportional valve 3 is the shell 31, and the shell 31 includes an upper shell 311 and a lower shell 312. One side of the upper shell 311, namely Figure 3 The air inlet cavity 32 is provided on the left side of the view, and the other side of the upper shell 311 is Figure 3 An air outlet cavity 33 is provided on the right side in the view, an air cavity 36 is provided in the lower housing 312, the first pipe 21 communicates with the intake cavity 32, and the second pipe 22 communicates with the air outlet cavity 33. One end of the adjusting pipe 4 is fixedly connected to the lower housing 312, and the adjusting pipe 4 communicates with the air cavity 36. A first adjusting member 34 is further provided in the outer shell 31. As Figure 3 shown, the first adjusting member 34 is a conventional structure, which includes a first rod 341 arranged along the central axes of the upper housing 311 and the lower housing 312. The upper end of the first rod 341 is in the middle of the upper housing 311, and the lower end of the first rod 341 penetrates into the lower housing 312 and is connected to the elastic piece 344. The air entering the air cavity 36 through the adjusting pipe 4 can change the air pressure in the air cavity 36, causing the elastic piece 344 to deform and drive the first rod 341 to move Figure 3 vertically upward in the view, so that the valve piece 342 is separated from the connection port between the intake cavity 32 and the air outlet cavity 33, so that the gas can flow from the intake cavity 32 to the air outlet cavity 33. This is the prior art and can be directly applied without further elaboration;

[0041] In addition, the pressure relief pipe 7 is fixedly connected to the lower housing 312. As Figure 3 shown, a small hole 3121 communicating with the intake cavity 32 is provided on the lower housing 312. The small hole 3121 is separated from the air cavity 36. A second adjusting member 35 is further provided on the lower housing 312. The second adjusting member 35 is used to control the on-off between the pressure relief pipe 7 and the intake cavity 32. Optionally, the second adjusting member 35 is a solenoid valve provided at the corresponding connection position of the pressure relief pipe 7 on the lower housing. Specifically, during implementation, the solenoid valve can also be connected in series on the pressure relief pipe 7. This is the prior art and will not be elaborated.

[0042] In another embodiment proposed by the present invention, the regulating valve 5 includes a valve body 51. A first valve member and a second valve member are installed in the valve body 51. When the first valve member is driven to rotate, the air path is switched to the circulation pipe 6. When the second valve member is driven to rotate, the flow rate of the gas flowing through the connection position of the adjusting pipe 4 on the air pipe 1 is adjusted.

[0043] Further, the first valve member includes a first valve core 52 rotatably installed on the valve body 51. A first valve hole 521 and a second valve hole 522 are formed in the first valve core 52. The first valve hole 521 penetrates along the radial direction of the first valve core 52. The second valve hole 522 is perpendicular to the first valve hole 521 and penetrates from the center point of the first valve core 52 to the outer wall of the first valve core 52.

[0044] Furthermore, the second valve component includes a second valve core 53 rotatably installed in the first valve core 52, and the second valve core 53 includes an arc plate 531 capable of blocking either the first valve hole 521 or the second valve hole 522. The arc plate 531 is fixedly connected to a stopper 532, and the stopper 532 is rotatably connected to the first valve core 52.

[0045] Preferably, a first driving member and a second driving member are installed on the outside of the valve body 51 , the first driving member drives the first valve core 52 to rotate, and the second driving member drives the second valve core 53 to rotate.

[0046] Specifically, in the above embodiment, the regulating valve 5 adopts a three-way valve to switch the air path between the outlet pipe 12 and the circulation pipe 6. In the process of switching the air path from the circulation pipe 6 to the outlet pipe 12, since the air flow rate entering the outlet pipe 12 is too small to generate pressure in the regulating pipe 4 that can drive the elastic piece 344 of the first regulating member 34 to move, the introduction of this part of air will cause the air ratio in the mixed gas to be higher. In order to achieve the best mixing ratio of air and gas as much as possible during the introduction stage, in specific implementation, Increasing the switching speed of the air path makes it difficult to fine-tune (precisely adjust) the air flow rate entering the outlet pipe 12 through the three-way valve. During the combustion process of the burner of the annealing furnace, it is necessary to finely adjust the air-fuel mixture introduced according to actual conditions in order to control the flame size. In this embodiment, the main structure of the regulating valve 5 is a valve body 51, and a first valve member and a second valve member are rotatably installed in the valve body 51. When the first valve member rotates, the air path is switched, and when the second valve member rotates, the flow rate of the air entering the outlet pipe 12 is precisely controlled. Figures 5 to 7 As shown, the first valve member includes a first valve core 52, and a first valve hole 521 and a second valve hole 522 are opened on the first valve core 52. The first valve hole 521 is arranged to penetrate the first valve core 52 in a radial direction, and the second valve hole 522 is opened perpendicular to the first valve core 52. Preferably, the first valve core 52 is spherical to facilitate the sealing between the first valve core 52 and the air inlet pipe 11, the air outlet pipe 12 and the circulation pipe 6; the second valve member is a second valve core 53 rotatably installed in the first valve core 52, and the second valve core 53 includes an arc plate 531 and a stopper 532, as shown in FIG. Figure 5 and Figure 9 As shown, a cylindrical mounting hole is provided in the first valve core 52 perpendicular to both the first valve hole 521 and the second valve hole 522. The arc plate 531 is in contact with the circumferential surface of the mounting hole. The stopper 532 is cylindrical, and the diameter of the stopper 532 is equal to the diameter of the mounting hole. The stopper 532 is dynamically sealed and installed in the mounting hole. The first valve core 52 has a first angle and a second angle during its rotational stroke.

[0047] At the first angle, Figure 5As shown, the two ends of the first valve hole 521 correspond to the air inlet pipe 11 and the air outlet pipe 12 respectively, and the second valve hole 522 corresponds to the end of the circulation pipe 6. At this time, the arc plate 531 of the second valve core 53 blocks the end of the first valve hole 521 corresponding to the air outlet pipe 12, so that the air introduced by the air inlet pipe 11 can be passed into the circulation pipe 6.

[0048] At the second angle, Figure 9 As shown, the two ends of the first valve hole 521 correspond to the air inlet pipe 11 and the air outlet pipe 12 respectively, and the second valve hole 522 corresponds to the inner wall of the valve body 51. At this time, by rotating the angle of the arc plate 531 to adjust its blocking area of the first valve hole 521, the flow rate of air entering the air outlet pipe 12 can be adjusted.

[0049] In a specific implementation, a first driving member for driving the first valve core 52 and a second driving member for driving the second valve core 53 can be provided on the valve body 51, so as to realize the electric control adjustment of the first valve core 52 and the second valve core 53. Figure 4 and Figure 10 As shown, a mounting bracket 55 is fixedly connected to one side of the corresponding mounting hole on the valve body 51, and the first driving member is a first motor 551 fixedly connected to the mounting bracket 55, and the output end of the first motor 551 is fixedly connected to the first gear 552, and a cylinder 523 is fixedly connected to the first valve core 52 at an outer position of the mounting hole. The inner diameter of the cylinder 523 is equal to the diameter of the mounting hole, and the cylinder 523 extends to the outside of the valve body 51 along the axial direction of the mounting hole, and the outer wall of the cylinder 523 is sleeved with a second gear 553, and the second gear 553 and the first gear 552 are engaged with each other to realize the driving of the first valve core 52 by the first motor 551; the second driving member is a second motor 554 fixedly connected to the mounting bracket 55, and the output end of the second motor 554 is coaxially connected to the end face of the stopper 532 outside the valve body 51. Preferably, a micro reducer is installed between the second motor 554 and the stopper 532 to facilitate the precise adjustment of the rotation angle of the stopper 532 by the second motor 554.

[0050] When the air-fuel ratio automatic adjustment device is in use, the first valve core 52 is at a first angle, and when the air flow in the intake pipe 11 reaches a stable state or reaches a pressure that can drive the first adjustment member 34 to operate, the first motor 551 drives the second gear 553 to rotate through the first gear 552, and the second gear 553 drives the first valve core 52 to adjust from the first angle to the second angle through the cylinder 523. At this time, air is passed from the intake pipe 11 into the outlet pipe 12, and the air passing through the adjustment pipe 4 increases the air pressure in the air cavity 36, prompting the first adjustment member 34 to operate, so that the intake cavity 32 is connected to the outlet cavity 33. At the same time, the second adjustment member 35 such as the solenoid valve provided on the outer shell 31 is energized and disconnects the intake cavity 32 from the pressure relief pipe 7. After the gas enters the outlet cavity 33 through the intake cavity 32, it is transported to the burner through the second pipe 22.

[0051] In this embodiment, a first valve core 52 for adjusting the air path and a second valve core 53 for adjusting the air flow are arranged in the valve body 51, and a first motor 551 for driving the first valve core 52 to rotate and a second motor 554 for driving the second valve core 53 to rotate are arranged on the valve body 51, so that the regulating valve 5 can not only quickly operate to realize the switching of the air path, but also accurately control the flow of air flowing into the outlet pipe 12.

[0052] In another embodiment proposed by the present invention, the first valve core 52 is connected to the second adjusting member 35 through a transmission member 8. When the first driving member drives the first valve core 52 to rotate, it also drives the second adjusting member 35 to control the connection and disconnection between the air intake chamber 32 and the pressure relief pipe 7.

[0053] Furthermore, the second adjusting member 35 includes a ring 351 rotatably mounted on the housing 31 , and a through hole 352 is defined in the ring 351 .

[0054] Specifically, during actual use of the air-fuel ratio automatic regulating device, the operations of switching the air flow path from the circulation pipe 6 to the outlet pipe 12 and the gas flow path from the pressure relief pipe 7 to the second pipe 22 need to be carried out simultaneously to ensure that the air and gas can reach or approach the optimal ratio when entering and exiting the gas. In the above embodiment, the second regulating member 35 adopts an electromagnetic valve, and the first valve core 52 is driven by the first motor 551. In this way, as long as one of the first motor 551 or the electromagnetic valve fails, only air will be passed into the burner of the annealing furnace, or most of the gas will be transported through the pressure relief valve, resulting in insufficient air pressure in the air inlet chamber 32, resulting in only a small amount of gas entering the air outlet chamber 33 and being transported to the burner, that is, the air-fuel mixture in the burner is in a lean burn state, which is not conducive to the annealing of steel. In this embodiment, Figure 4As shown, the first valve core 52 and the second regulating member 35 are connected by a transmission member 8, and a single electric control unit is used to drive the first valve core 52 and the second regulating member 35 simultaneously. When the electric control unit fails, the first valve core 52 and the second regulating member 35 remain stationary, that is, neither air nor gas is introduced into the burner. Optionally, the second regulating member 35 includes a ring 351 rotatably mounted on the lower shell 312, and the ring 351 is coaxially arranged with the lower shell 312, and A through hole 352 is provided on the ring 351 along its own axial direction. Preferably, the diameter of the through hole 352 is equal to the diameter of the small hole 3121 provided in the lower shell 312. Within the rotation range of the ring 351, there is an angle at which the through hole 352 and the small hole 3121 are opposite each other. The transmission member 8 is in transmission connection with the ring 351 so that the first valve core 52 can be driven to rotate while also driving the ring 351 to rotate, thereby avoiding the situation where only air or gas is introduced due to a malfunction of the electrical control unit.

[0055] Furthermore, the transmission member 8 includes a rotating shaft 81 rotatably mounted on the bracket, one end of the rotating shaft 81 is fixedly connected to a spur gear 82 meshing with the second gear 553, the other end of the rotating shaft 81 is fixedly connected to a first bevel gear 83, and a second bevel gear 84 is provided at the edge of the ring 351 to cooperate with the first bevel gear 83.

[0056] Specifically, in this embodiment, the regulating valve 5 and the proportional valve 3 are arranged at the same height. Figure 4 As shown, a rotating shaft 81 is rotatably mounted on the bracket, and one end of the rotating shaft 81 corresponding to the second gear 553 is fixedly connected to a spur gear 82, and the spur gear 82 and the second gear 553 are meshed with each other. One end of the rotating shaft 81 corresponding to the ring 351 is fixedly connected to a first bevel gear 83, and the edge position of the ring 351 is fixedly connected to a second bevel gear 84, the second bevel gear 84 is annular, and the first bevel gear 83 and the second bevel gear 84 are meshed with each other; when the first valve core 52 needs to be adjusted from the above-mentioned first angle to the second angle, the first motor 551 drives the second gear 553 to rotate through the first gear 552, and the second gear 553 drives the first valve core 52 to rotate through the cylinder 523, and at the same time, with the first The spur gear 82 meshing with the two gears 553 rotates driven by the second gear 553, and drives the rotating shaft 81 to rotate. The rotating shaft 81 drives the ring 351 to rotate through the cooperation of the first bevel gear 83 and the second bevel gear 84 at its end, so that the through hole 352 on the ring 351 gradually staggers with the small hole 3121 on the lower shell 312. When the first valve core 52 is adjusted to the second angle, the through hole 352 is completely staggered with the small hole 3121, that is, the gas cannot enter the pressure relief pipe 7 through the small hole 3121, so that there is sufficient gas pressure in the air intake chamber 32, ensuring that enough gas can enter the second tube 22 when the first adjustment member 34 is opened.

[0057] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. An automatic air-fuel ratio adjustment device for high-quality steel combustion, which is used for automatically adjusting the fluid ratio in the air pipe and the gas pipe. It includes a proportional valve installed on the gas pipe, and an adjustment pipe is connected to the proportional valve. The end of the adjustment pipe far from the proportional valve communicates with the air pipe. It is characterized in that, A circulation pipe is connected to the position of the air pipe corresponding to the regulating pipe. A regulating valve is installed at the connection position of the air pipe and the circulation pipe. The regulating valve is used to switch the air path to the circulation pipe to disconnect the under-pressure state of the air pipe and disconnect the working state of the circulation pipe to unblock the air pipe. The regulating valve includes a valve body, and a first valve member and a second valve member are installed in the valve body. When the first valve member is driven to rotate, the air path is switched to the circulation pipe. When the second valve member is driven to rotate, the flow rate of the gas flowing through the connection position of the regulating pipe on the air pipe is adjusted. The first valve member includes a first valve core rotatably installed on the valve body. A first valve hole and a second valve hole are formed on the first valve core. The first valve hole is arranged through the first valve core in the radial direction. The second valve hole is arranged perpendicular to the first valve hole, and the second valve hole penetrates from the center point of the first valve core to the outer wall of the first valve core. The second valve member includes a second valve core rotatably installed in the first valve core. The second valve core includes an arc-shaped plate capable of blocking either the first valve hole or the second valve hole. The arc-shaped plate is fixedly connected with a blocking block, and the blocking block is rotatably connected with the first valve core. The first valve core is spherical. A cylindrical installation hole is formed in the first valve core perpendicular to both the first valve hole and the second valve hole. The arc-shaped plate fits with the circumferential surface of the installation hole. The blocking block is cylindrical, and the diameter of the blocking block is equal to the diameter of the installation hole. The blocking block is installed in the installation hole in a dynamic sealing manner. In the rotation stroke of the first valve core, there are a first angle and a second angle: when in the first angle, both ends of the first valve hole correspond to the air inlet pipe and the air outlet pipe respectively, while the second valve hole corresponds to the end of the circulation pipe. The arc-shaped plate of the second valve core blocks the end of the first valve hole corresponding to the air outlet pipe, so that the air introduced from the air inlet pipe can be introduced into the circulation pipe; when in the second angle, both ends of the first valve hole correspond to the air inlet pipe and the air outlet pipe respectively, while the second valve hole corresponds to the inner wall of the valve body. By rotating the angle of the arc-shaped plate to adjust its blocking area of the first valve hole, the flow rate of the air entering the air outlet pipe can be adjusted. A first driving member and a second driving member are installed outside the valve body. A mounting frame is fixedly connected to one side of the valve body corresponding to the installation hole. The first driving member is a first motor fixedly connected to the mounting frame. The output end of the first motor is fixedly connected with a first gear. A cylinder is fixedly connected to the outer side position of the first valve core at the installation hole. The inner diameter of the cylinder is equal to the diameter of the installation hole, and the cylinder extends along the axial direction of the installation hole to the outside of the valve body. A second gear is sleeved on the outer wall of the cylinder, and the second gear meshes with the first gear to realize the driving of the first valve core by the first motor. The second driving member is a second motor fixedly connected to the mounting frame. The output end of the second motor is coaxially connected to the end face of the blocking block outside the valve body. A micro-reducer is installed between the second motor and the blocking block. The first valve core is in transmission connection with the second regulating member through a transmission member. When the first driving member drives the first valve core to rotate, it also drives the second regulating member to control the connection and disconnection of the air inlet cavity and the pressure relief pipe. The transmission member includes a rotating shaft rotatably installed on a bracket. One end of the rotating shaft is fixedly connected with a spur gear meshing with the second gear, and the other end of the rotating shaft is fixedly connected with a first bevel gear. A second bevel gear cooperating with the first bevel gear is arranged at the edge position of the ring.

2. The automatic air-fuel ratio adjustment device for the combustion of high-quality steel according to claim 1, characterized in that, A pressure relief pipe is connected to the proportional valve. When the air pipe is connected to the circulation pipe, the proportional valve connects the gas pipe to the pressure relief pipe. When the air pipe is disconnected from the circulation pipe, the proportional valve disconnects the connection between the gas pipe and the pressure relief pipe.

3. The automatic air-fuel ratio adjustment device for the combustion of high-quality steel according to claim 2, characterized in that, The proportional valve includes a housing. An air inlet chamber and an air outlet chamber are provided inside the housing, and a first adjusting member is provided inside the housing. The first adjusting member is used to control the connection and disconnection between the air inlet chamber and the air outlet chamber. The pressure relief pipe is connected to the air inlet chamber, and a second adjusting member for controlling the connection and disconnection between the air inlet chamber and the pressure relief pipe is also provided inside the housing.

4. The automatic air-fuel ratio adjustment device for high-quality steel combustion according to claim 3, characterized in that, The first adjusting member includes a first rod disposed inside the housing. A valve disc is sleeved on the middle part of the first rod. A spring for maintaining the valve disc to block the connection port between the air inlet chamber and the air outlet chamber is provided inside the housing. An air chamber is provided at the lower part of the housing. An elastic piece is provided at a position corresponding to the lower end of the first rod on the air chamber. The elastic piece is fixedly connected to the lower end of the first rod, and the edge position of the elastic piece is fixedly connected to the housing. The adjusting pipe is connected to the air chamber.

5. The automatic air-fuel ratio adjustment device for high-quality steel combustion according to claim 3, characterized in that, The second adjusting member includes a ring rotatably mounted on the housing. A through hole is provided on the ring.

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