A burner with premixing and preheating function

Abstract

The present invention discloses a burner with a premixing and preheating function in the technical field of burners, comprising: a fan, a combustion tube is provided at the outlet of the fan, a gas inlet pipe is connected to the combustion tube, a first partition with a first valve is provided in the combustion tube, the first partition divides the inner cavity of the combustion tube into a combustion chamber and a pretreatment chamber, a first impeller is rotatably provided in the pretreatment chamber, a mixing assembly is provided on the shaft of the first impeller, a rotating rod is rotatably provided in the pretreatment chamber, and a friction sleeve for sleeved on the outer wall of the rotating rod is provided in the pretreatment chamber; in the present application, the power brought by air entering the pretreatment chamber is used to drive the mixing assembly to rotate, so as to premix air and gas, and the power brought by gas entering the pretreatment chamber is used to drive the rotating rod to rotate, so that the rotating rod rubs with the friction sleeve to generate heat, so as to preheat the mixed gas, thereby saving energy.

Description

Technical Field

[0001] The invention relates to the technical field of burners, in particular to a burner with premixing and preheating functions. Background Art

[0002] A burner is a device that sprays fuel and air in a certain way for mixed combustion. In order to improve combustion efficiency and reduce harmful gas emissions, air or a mixture of air and gas is generally preheated so that the mixed gas can burn quickly and stably after entering the combustion chamber, thereby improving combustion efficiency and reducing heat loss. For example, a public document of a gas burner with an air preheating device with publication number CN218820375U discloses such a burner with a preheating function;

[0003] However, the device has certain limitations during use. For example, the burner heats the air through an additional heating wire to achieve preheating of the air. This requires the use of energy supply equipment to power the heating wire separately, which increases energy consumption. Summary of the invention

[0004] The object of the present invention is to provide a burner with a premixing and preheating function to solve the problem that the burner proposed in the above background technology heats the air by adding an electric heating wire to achieve preheating of the air, which requires the use of an energy supply device to power the electric heating wire separately, thereby increasing energy consumption.

[0005] To achieve the above object, the present invention provides the following technical solution: a burner with premixing and preheating function, comprising: a blower, a combustion tube is provided at the outlet of the blower, a gas inlet pipe is connected to the combustion tube, a first partition with a first valve is provided in the combustion tube, and the first partition divides the inner cavity of the combustion tube into a combustion chamber and a pretreatment chamber isolated from each other;

[0006] A first impeller is rotatably provided in the pretreatment chamber, a mixing assembly is provided on the shaft of the first impeller, a rotating rod is rotatably provided in the pretreatment chamber, a friction sleeve for sleeved on the outer wall of the rotating rod is provided in the pretreatment chamber, a second impeller is rotatably provided in the gas inlet pipe, and a linkage assembly is provided between the second impeller and the rotating rod; when the outside air and gas enter the pretreatment chamber, the air will drive the first impeller and the mixing assembly to rotate to mix the gas with the air, and at the same time the gas will drive the second impeller to rotate, and the rotating rod is rotated and rubbed inside the friction sleeve through the linkage assembly, and the mixed gas is heated by the heat generated by the friction.

[0007] Preferably, the mixing assembly comprises a mounting sleeve sleeved on the first impeller shaft, a plurality of friction plates are provided on the outer wall of the mounting sleeve, an annular member is provided on the inner wall of the pretreatment chamber, a side wall of the friction plate away from the mounting sleeve is in contact with the inner wall of the annular member, and the friction plate and the annular member are both metal heat-conducting members.

[0008] Preferably, an annular groove is provided on the inner wall of the pretreatment chamber, the annular member is installed in the annular groove to seal the annular groove, the annular groove is filled with gas, and an opening extending along the length direction of the pretreatment chamber is provided on the side of the friction plate facing the fan.

[0009] Preferably, the mounting sleeve is rotatably mounted on the shaft of the first impeller, a slot is provided on the side wall of the shaft of the first impeller, a mounting slot is provided on the friction plate, an insert block for being inserted into the slot and an elastic member connected to the insert block are slidably provided in the mounting slot, the slot is filled with an expansion fluid, a push block for sealing the slot and for pushing the insert block to the outside of the slot is slidably provided in the slot, and the mounting sleeve and the shaft of the first impeller are both metal heat-conducting members; in the process of the friction plate rubbing the annular member, the temperature of the friction plate, the mounting sleeve and the shaft of the first impeller will continue to rise, causing the mercury inside the slot to expand due to the heat, pushing the push block to move, and pushing the insert block to the outside of the slot, thereby disconnecting the fixed connection between the mounting sleeve and the shaft of the first impeller.

[0010] Preferably, a second partition is provided in the pretreatment chamber, the second partition divides the inner cavity of the pretreatment chamber into a first treatment chamber and a second treatment chamber isolated from each other, the first treatment chamber is connected with the outlet of the fan, the second treatment chamber is located between the first treatment chamber and the combustion chamber, a connecting port for connecting the first treatment chamber with the second treatment chamber is opened on the second partition, the connecting port is provided with a second valve, and solenoid valves are provided on the fan inlet and the gas inlet pipe;

[0011] Among them, the first impeller, the mounting sleeve and the friction plate are located in the first processing chamber, and the rotating rod and the friction sleeve are located in the second processing chamber; after the gas and air are mixed inside the first processing chamber, the second valve is opened to allow the mixed gas to enter the second processing chamber from the first processing chamber, and when the second valve is opened, the solenoid valves on the fan inlet and the gas inlet pipe are closed.

[0012] Preferably, one end of the first impeller's axis facing the second partition extends through the second partition into the second processing chamber, one end of the first impeller's axis facing the second partition is provided with a socket, one end of the rotating rod facing the second partition is inserted into the socket, a flow channel is provided on the axis of the first impeller, an outlet for communicating with the flow channel is provided on the axis of the first impeller, the outlet of the second valve is connected with the flow channel through a conduit, and the rotation direction of the rotating rod is opposite to that of the first impeller; the mixed gas enters the flow channel through the second valve and the conduit, and absorbs the heat generated by the friction between the axis of the first impeller and the rotating rod.

[0013] Preferably, the outer wall of the friction sleeve is provided with a plurality of grooves, in which a pressure block for fitting with the outer wall of the rotating rod and an elastic element connected to the pressure block are slidably provided, and the rotating rod is provided with a liquid storage tank for filling with expansion liquid, and a placement groove is provided on the liquid storage tank, in which an extrusion block for fitting with the pressure block is slidably provided, and the pressure block is a metal heat conductor; when the rotating rod rotates inside the friction sleeve, the temperature of the rotating rod and the friction sleeve will continue to rise, and the temperature is transferred to the expansion liquid in the liquid storage tank, causing it to expand due to the heat, and is used to push the extrusion block to move toward the inside of the groove until the pressure block is no longer in contact with the rotating rod.

[0014] Preferably, a through hole extending along the length direction of the second processing chamber is formed through a side wall of the friction sleeve facing the second partition plate, the through hole is communicated with the slot, and the pressure block cuts off the through hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: in the present application, the power brought by the air entering the pretreatment chamber is used to drive the mixing component to rotate, so as to premix the air and the gas, and the power brought by the gas entering the pretreatment chamber is used to drive the rotating rod to rotate, so that it rubs with the friction sleeve to generate heat to preheat the mixed gas, which reasonably utilizes the power brought by the flow of air and gas, saves energy, and also improves the environmental performance of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the burner structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the connection structure between the fan and the combustion tube of the present invention;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the combustion tube of the present invention;

[0019] Figure 4 This is an enlarged schematic diagram of the structure at A of the present invention;

[0020] Figure 5 This is a schematic cross-sectional view of the connection between the first impeller and the rotating rod of the present invention;

[0021] Figure 6 This is a schematic diagram of the connection structure between the mounting sleeve and the friction plate of the present invention;

[0022] Figure 7 This is an enlarged schematic diagram of the structure at B of the present invention;

[0023] Figure 8 It is a cross-sectional schematic diagram of the connection between the rotating rod and the friction sleeve of the present invention.

[0024] In the figure: 1, fan; 2, combustion tube; 21, combustion chamber; 22, pretreatment chamber; 221, second treatment chamber; 222, first treatment chamber; 3, air inlet pipe; 4, gas inlet pipe; 5, linkage assembly; 6, first baffle; 7, first impeller; 71, slot; 72, push block; 8, mixing assembly; 81, mounting sleeve; 82, friction plate; 821, opening; 822, mounting groove; 823, plug block; 824, elastic member; 9, second impeller; 10, rotating rod; 101, liquid storage tank; 102, extrusion block; 11, friction sleeve; 111, slot; 112, pressure block; 113, through hole; 12, second baffle; 13, ignition device; 14, first valve; 15, second valve; 16, conduit; 17, annular member; 18, annular groove; 19, outlet; 20, flow channel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] See also Figure 1 and Figure 2A burner with a premixing and preheating function comprises: a fan 1, an inlet of the fan 1 is connected to an air intake pipe 3, an outlet of the fan 1 is connected to a combustion tube 2, a gas inlet pipe 4 is connected to the combustion tube 2, a first partition 6 is provided in the inner cavity of the combustion tube 2, the first partition 6 divides the inner cavity of the combustion tube 2 into a combustion chamber 21 and a pretreatment chamber 22 (the gas inlet pipe 4 is connected to the pretreatment chamber 22), the combustion chamber 21 and the pretreatment chamber 22 are isolated from each other, the pretreatment chamber 22 is connected to the outlet of the fan 1 (the pretreatment chamber 22 is close to the fan 1, and the pretreatment chamber 22 is located on the left side of the combustion chamber 21), an ignition device 13 is provided in the combustion chamber 21 (the ignition device 13 refers to the igniter on the burner, the igniter belongs to the existing equipment and is not described in detail here), an opening is provided on the first partition 6, the combustion chamber 21 is connected to the pretreatment chamber 22 through the opening, and a first valve 14 is provided on the opening to control the opening and closing of the opening.

[0028] See also Figure 2 and Figure 3 A first impeller 7 is rotatably provided in the inner cavity of the pretreatment chamber 22 (the first impeller 7 includes a shaft and blades installed on the shaft, the shaft is rotatably installed in the inner cavity of the pretreatment chamber 22, and the blades face the outlet of the fan 1), and a mixing assembly 8 is provided on the side wall of the shaft of the first impeller 7; a rotating rod 10 is rotatably provided in the inner cavity of the pretreatment chamber 22, and a friction sleeve 11 is fixedly provided in the inner cavity of the pretreatment chamber 22, the friction sleeve 11 is sleeved on the outer wall of the rotating rod 10, and the inner side wall of the friction sleeve 11 is in contact with the outer side wall of the rotating rod 10 (the friction sleeve 11 and the rotating rod 10 are both metal heat-conducting parts, such as copper, iron, etc.), and the gas inlet pipe A second impeller 9 is rotatably installed in the inner cavity of 4 (the second impeller 9 has the same structure as the first impeller 7), and a linkage assembly 5 is provided on the gas inlet pipe 4 (the linkage assembly 5 includes a rotating shaft, which is rotatably installed on the side wall of the gas inlet pipe 4, and a driven gear is installed on one end of the rotating shaft. A driving gear is sleeved on the shaft of the second impeller 9, and the driving gear is meshed with the driven gear. A roller is installed on the other end of the rotating shaft, and a roller is fixedly sleeved on the outer wall of the rotating rod 10, and the two rollers are driven by a transmission belt). The linkage assembly 5 is linked with the second impeller 9 and the rotating rod 10 respectively, so that the second impeller 9 and the rotating rod 10 can rotate synchronously.

[0029] It should be noted that a ratchet gear is fixedly sleeved on the shaft of the first impeller 7, a receiving groove is opened on the inner wall of the pretreatment chamber 22, a limit block is slidably inserted in the receiving groove, a spring is installed between the limit block and the receiving groove, and the end of the limit block away from the spring is located between the teeth of the ratchet gear, which is used to limit the first impeller 7 so that it can only rotate in one direction; the above-mentioned structure is also installed at the gas inlet pipe 4 and the second impeller 9, which is used to make the second impeller 9 also rotate only in one direction.

[0030] Working principle: The fan 1 works to guide the outside air from the air inlet pipe 3 into the pretreatment chamber 22 of the combustion tube 2. When the air passes through the first impeller 7, the first impeller 7 will rotate, thereby rotating the mixing component 8. At the same time, the gas enters the interior of the pretreatment chamber 22 through the gas inlet pipe 4. The gas and air are mixed by the rotation of the mixing component 8. When the gas passes through the gas inlet pipe 4, it will pass through the second impeller 9 to rotate. Through the linkage action of the linkage component 5, the rotating rod 10 rotates synchronously with the second impeller 9 and contacts and rubs with the inner wall of the friction sleeve 11. Heat is generated due to friction. The heat generated by friction is used to heat the mixed gas, which has the effect of preheating the mixed gas. Then the first valve 14 is opened to allow the mixed gas to enter the interior of the combustion chamber 21. Then the ignition device 13 is ignited to ignite the mixed gas and burn it inside the combustion chamber 21.

[0031] It should be noted that the power brought by the air entering the pretreatment chamber 22 is used to drive the mixing component 8 to rotate, so as to mix the air and the gas, which reasonably utilizes the power brought by the air flow and saves energy; and the power brought by the gas entering the pretreatment chamber 22 is used to drive the rotating rod 10 to rotate, so that it rubs with the friction sleeve 11 to generate heat to preheat the mixed gas. There is no need to set up equipment that requires independent energy drive, which saves energy and improves the environmental protection performance of the burner; by premixing and preheating the gas and air inside the pretreatment chamber 22, the mixed gas can burn quickly and stably after entering the combustion chamber 21, thereby improving the combustion efficiency, reducing heat loss, and reducing the probability of exhaust gas generation.

[0032] In this embodiment, as a further optimized solution, please refer to Figure 4 The mixing assembly 8 includes a mounting sleeve 81 and a friction plate 82. The mounting sleeve 81 is sleeved on the shaft of the first impeller 7. There are a plurality of friction plates 82, which are mounted on the outer wall of the mounting sleeve 81 and are distributed in a ring shape. An annular member 17 is provided on the inner wall of the pretreatment chamber 22. A side wall of the friction plate 82 away from the mounting sleeve 81 is in contact with the inner wall of the annular member 17. Both the friction plate 82 and the annular member 17 are metal heat-conducting members (such as copper, iron, etc.). When the first impeller 7 rotates, the mounting sleeve 81 will rotate with the friction plate 82, so that the friction plate 82 will continue to rub against the inner wall of the annular member 17. The friction between the two will generate heat for preheating the mixed gas, so that the mixing assembly 8 can not only mix the air and the gas, but also heat the air and the gas, thereby increasing the preheating effect of the mixed gas.

[0033] In this embodiment, as a further optimized solution, please refer to Figure 4, an annular groove 18 is provided on the inner wall of the pretreatment chamber 22, and the annular member 17 is installed in the annular groove 18 to block the annular groove 18. The annular groove 18 is filled with gas (the gas is blocked in the inner cavity of the annular groove 18 by the annular member 17). During the continuous friction between the friction plate 82 and the annular member 17, the heat generated by the friction will be transferred to the gas inside the annular groove 18, causing it to expand due to the heat, and will squeeze the annular member 17 to make it move closer to the friction plate 82, thereby increasing the contact pressure between the annular member 17 and the friction plate 82, thereby increasing the friction force of the contact between the two, increasing the heat generated by friction, and improving the preheating effect of the mixing component 8; an opening 821 is provided through the side wall of the friction plate 82 facing the fan 1, and the opening 821 extends along the length direction of the pretreatment chamber 22, so that the mixed gas can enter the interior of the opening 821, increasing the contact area between the mixed gas and the friction plate 82, so that the friction plate 82 and the mixed gas can exchange heat more fully, thereby increasing the preheating effect.

[0034] In this embodiment, as a further optimized solution, please refer to Figure 6 and Figure 7 , the mounting sleeve 81 is rotatably sleeved on the shaft of the first impeller 7, a slot 71 is provided on the side wall of the shaft of the first impeller 7, the slot 71 is filled with an expansion liquid (the expansion liquid refers to mercury), a push block 72 is slidably provided in the slot 71, the push block 72 blocks the slot 71 to prevent the expansion liquid from leaking out (the outer wall of the push block 72 and the inner wall of the slot 71 are sealed; the push block 72 and the slot 71 are also anti-corrosive treated to prevent mercury from corroding the slot 71 and the push block 72), a mounting groove 822 is provided on one side wall of the friction plate 82 facing the mounting sleeve 81, an insert block 823 is slidably provided in the mounting groove 822, an elastic member 824 (spring) is installed between the mounting groove 822 and the insert block 823, the end of the insert block 823 away from the friction plate 82 is inserted in the slot 71 and contacts the push block 72, the mounting sleeve 81 and the first impeller 7 are connected to the first impeller 7. The shafts of the first impeller 7 are all metal heat-conducting parts; in the process of the friction plate 82 rubbing the annular member 17, the temperature on the friction plate 82 will continue to rise, and at the same time, the temperature of the mounting sleeve 81 and the shaft of the first impeller 7 will continue to rise, which will cause the mercury inside the slot 71 to expand due to the heat, push the push block 72 to move, and push the plug block 823 to the outside of the slot 71 until the plug block 823 is removed from the inside of the slot 71; at this time, the heat generated by friction is relatively large, so that the fixed connection between the mounting sleeve 81 and the shaft of the first impeller 7 is disconnected, so that the rotation of the first impeller 7 will not bring the mounting sleeve 81 and the friction plate 82 to rotate, or the first impeller 7 cannot continue to bring the mounting sleeve 81 and the friction plate 82 to rotate, which is used to reduce the friction amplitude between the friction plate 82 and the annular member 17 to avoid excessive heat generated by friction and igniting the mixed gas.

[0035] Example 2

[0036] As a further optimized solution of Example 1, please refer to Figure 2 , Figure 3 and Figure 4 A second partition 12 is provided in the inner cavity of the pretreatment chamber 22, and the second partition 12 divides the inner cavity of the pretreatment chamber 22 into a first treatment chamber 222 and a second treatment chamber 221. The first treatment chamber 222 and the second treatment chamber 221 are isolated from each other, and the first treatment chamber 222 is connected to the outlet of the fan 1, and the second treatment chamber 221 is located between the first treatment chamber 222 and the combustion chamber 21. A connecting port is opened on the second partition 12, and the connecting port connects the first treatment chamber 222 with the second treatment chamber 221. The connecting port is provided with a second valve 15 (the second valve 15 refers to an electrically controlled valve, such as a solenoid valve), and a solenoid valve is provided on the inlet of the fan 1 and the gas inlet pipe 4; the first impeller 7, the mounting sleeve 81 and the friction plate 82 are located in the first treatment chamber 222, and the rotating rod 10 and the friction sleeve 11 is located in the second treatment chamber 221; the pretreatment chamber 22 is divided by the second partition 12, so that the air and the gas are mixed inside the first treatment chamber 222, and then the second valve 15 is opened to allow the mixed gas to enter the second treatment chamber 221 from the first treatment chamber 222. During the opening of the second valve 15, the inlet of the fan 1 and the electromagnetic valve on the gas inlet pipe 4 are both closed, and the introduction of air and gas is stopped to make the gas mixing ratio more accurate; after the internal mixed gas of the first treatment chamber 222 is introduced into the second treatment chamber 221, the second valve 15 is closed, and then the inlet of the fan 1 and the electromagnetic valve on the gas inlet pipe 4 are both opened, and air and gas are continuously introduced into the first treatment chamber 222 and mixed, and the operation is repeated.

[0037] In this embodiment, as a further optimized solution, please refer to Figure 4 and Figure 5 The end of the first impeller 7 facing the second partition plate 12 passes through the second partition plate 12 and extends into the inner cavity of the second processing chamber 221. The end of the first impeller 7 facing the second partition plate 12 is provided with a plug hole. The end of the rotating rod 10 facing the second partition plate 12 is inserted into the plug hole. The outer wall of the rotating rod 10 is in contact with the inner wall of the plug hole. The shaft of the first impeller 7 is provided with a flow channel 20. The outer wall of the shaft of the first impeller 7 is provided with an outlet 19. The outlet 19 is connected with the flow channel 20 and is located in the second processing chamber 221. The second valve 15 is The outlet is connected to the flow channel 20 through the conduit 16, and the rotation direction of the rotating rod 10 is opposite to that of the first impeller 7 (the axis of the rotating rod 10 is the same as the axis of the shaft of the first impeller 7); the mixed gas enters the flow channel 20 through the second valve 15 and the conduit 16, absorbs the heat generated by the friction between the shaft of the first impeller 7 and the rotating rod 10, and then is discharged from the outlet 19 into the interior of the second treatment chamber 221, and the mixed gas is preheated again by using the heat generated by the friction between the shaft of the first impeller 7 and the rotating rod 10, thereby increasing the preheating effect.

[0038] Example 3

[0039] As a further optimized solution of Example 2, please refer to Figure 8 A plurality of grooves 111 are provided on the outer wall of the friction sleeve 11. The plurality of grooves 111 are distributed in an annular shape on the outer wall of the friction sleeve 11. A pressure block 112 is slidably provided in the groove 111. An elastic element (spring) is installed between the pressure block 112 and the groove 111. The pressure block 112 is in contact with the outer wall of the rotating rod 10. A liquid storage tank 101 is provided in the rotating rod 10. The liquid storage tank 101 is filled with an expansion liquid (mercury). A placement groove is provided on the liquid storage tank 101. An extrusion block 102 is slidably provided in the placement groove (the extrusion block 102 is an arc-shaped block, and the arc surface of the arc-shaped block faces the pressure block 112). The extrusion block 102 is away from one side of the rotating rod 10. The side wall is fitted with a side wall of the pressure block 112 facing the rotating rod 10, and the pressure block 112 is a metal heat-conducting part; when the rotating rod 10 rotates inside the friction sleeve 11, the temperature of the rotating rod 10 and the friction sleeve 11 will continue to rise, and the temperature is transferred to the expansion liquid in the liquid storage tank 101, causing it to expand due to heat, and is used to push the extrusion block 102 to move toward the inside of the groove 111; when the temperature is high, the extrusion block 102 moves with the pressure block 112 to the outside of the groove 111, so that the pressure block 112 does not contact the rotating rod 10, reducing the contact area between the friction sleeve 11 and the rotating rod 10, reducing the heat generated by the friction between the two, and avoiding the ignition of the mixed gas during the preheating process.

[0040] In this embodiment, as a further optimized solution, please refer to Figure 8 A through hole 113 is formed on one side wall of the friction sleeve 11 facing the second partition plate 12. The through hole 113 extends along the length direction of the second processing chamber 221. The through hole 113 is connected to the groove 111, and the pressing block 112 cuts off the through hole 113. When the pressing block 112 is pushed to move to the outside of the groove 111, the cutting effect of the pressing block 112 on the through hole 113 is released, so that the mixed gas can pass through the through hole 113, thereby increasing the contact area between the mixed gas and the friction sleeve 11 and increasing the heat exchange efficiency.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A burner with premixing and preheating function, comprising: A fan (1), wherein a combustion tube (2) is provided at the outlet of the fan (1), and a gas inlet pipe (4) is connected to the combustion tube (2), and the combustion tube (2) is characterized in that a first partition (6) with a first valve (14) is provided in the combustion tube (2), and the first partition (6) divides the inner cavity of the combustion tube (2) into a combustion chamber (21) and a pretreatment chamber (22) which are isolated from each other; A first impeller (7) is rotatably provided in the pretreatment chamber (22), a mixing assembly (8) is provided on the shaft of the first impeller (7), a rotating rod (10) is rotatably provided in the pretreatment chamber (22), a friction sleeve (11) is provided in the pretreatment chamber (22) for sleeved on the outer wall of the rotating rod (10), a second impeller (9) is rotatably provided in the gas inlet pipe (4), a linkage assembly (5) is provided between the second impeller (9) and the rotating rod (10); when outside air and gas enter the pretreatment chamber (22), the air drives the first impeller (7) and the mixing assembly (8) to rotate, thereby mixing the gas with the air, and at the same time, the gas drives the second impeller (9) to rotate, and the linkage assembly (5) is linked to make the rotating rod (10) rotate and rub inside the friction sleeve (11), thereby heating the mixed gas by using the heat generated by the friction; The mixing assembly (8) comprises a mounting sleeve (81) sleeved on the shaft of the first impeller (7), a plurality of friction plates (82) being provided on the outer wall of the mounting sleeve (81), an annular member (17) being provided on the inner wall of the pretreatment chamber (22), a side wall of the friction plate (82) away from the mounting sleeve (81) being in contact with the inner wall of the annular member (17), and the friction plate (82) and the annular member (17) are both metal heat-conducting members; The mounting sleeve (81) is rotatably mounted on the shaft of the first impeller (7); a slot (71) is provided on the side wall of the shaft of the first impeller (7); a mounting groove (822) is provided on the friction plate (82); an insert block (823) for inserting into the slot (71) and an elastic member (824) connected to the insert block (823) are slidably provided in the mounting groove (822); the slot (71) is filled with expansion fluid; a spring member (824) for sealing the slot (71) and for inserting the insert block (823) is slidably provided in the slot (71). A push block (72) is pushed toward the outside of the slot (71), and the mounting sleeve (81) and the shaft of the first impeller (7) are both metal heat-conducting parts; during the process of the friction plate (82) rubbing the annular part (17), the temperature of the friction plate (82), the mounting sleeve (81), and the shaft of the first impeller (7) will continue to rise, causing the mercury inside the slot (71) to expand due to the heat, pushing the push block (72) to move, pushing the insert block (823) toward the outside of the slot (71), and disconnecting the fixed connection between the mounting sleeve (81) and the shaft of the first impeller (7).

2. A burner with premixing and preheating function according to claim 1, characterized in that: An annular groove (18) is provided on the inner wall of the pretreatment chamber (22), the annular member (17) is installed in the annular groove (18) to seal the annular groove (18), the annular groove (18) is filled with gas, and an opening (821) extending along the length direction of the pretreatment chamber (22) is provided on a side of the friction plate (82) facing the fan (1).

3. The burner with premixing and preheating function according to claim 1, characterized in that: A second partition (12) is provided in the pretreatment chamber (22), the second partition (12) dividing the inner cavity of the pretreatment chamber (22) into a first treatment chamber (222) and a second treatment chamber (221) which are isolated from each other, the first treatment chamber (222) being connected to the outlet of the fan (1), the second treatment chamber (221) being located between the first treatment chamber (222) and the combustion chamber (21), the second partition (12) being provided with a communication port for connecting the first treatment chamber (222) and the second treatment chamber (221), the communication port being provided with a second valve (15), and the fan (1) inlet and the gas inlet pipe (4) being provided with solenoid valves; The first impeller (7), the mounting sleeve (81) and the friction plate (82) are located in the first processing chamber (222), and the rotating rod (10) and the friction sleeve (11) are located in the second processing chamber (221); after the gas and air are mixed in the first processing chamber (222), the second valve (15) is opened to allow the mixed gas to enter the second processing chamber (221) from the first processing chamber (222); while the second valve (15) is opened, the solenoid valves on the inlet of the fan (1) and the gas inlet pipe (4) are both closed.

4. A burner with premixing and preheating function according to claim 3, characterized in that: One end of the shaft of the first impeller (7) facing the second partition (12) passes through the second partition (12) and extends into the second processing chamber (221); one end of the shaft of the first impeller (7) facing the second partition (12) is provided with an insertion hole; one end of the rotating rod (10) facing the second partition (12) is inserted into the insertion hole; a flow channel (20) is provided on the shaft of the first impeller (7); an outlet (19) for communicating with the flow channel (20) is provided on the shaft of the first impeller (7); the outlet of the second valve (15) is communicated with the flow channel (20) via a conduit (16); the rotation direction of the rotating rod (10) is opposite to that of the first impeller (7); the mixed gas enters the flow channel (20) through the second valve (15) and the conduit (16) to absorb the heat generated by friction between the shaft of the first impeller (7) and the rotating rod (10).

5. The burner with premixing and preheating function according to claim 1, characterized in that: The outer wall of the friction sleeve (11) is provided with a plurality of grooves (111), and a pressure block (112) for fitting with the outer wall of the rotating rod (10) and an elastic element connected to the pressure block (112) are slidably provided in the groove (111), and a liquid storage tank (101) for filling with expansion liquid is provided in the rotating rod (10), and a placement groove is provided on the liquid storage tank (101), and an extrusion block (102) for fitting with the pressure block (112) is slidably provided in the placement groove, and the pressure block (112) is a metal heat conductive member; when the rotating rod (10) rotates inside the friction sleeve (11), the temperature of the rotating rod (10) and the friction sleeve (11) will continue to rise, and the temperature is transferred to the expansion liquid in the liquid storage tank (101), causing it to expand due to heat, and is used to push the extrusion block (102) to move toward the inside of the groove (111) until the pressure block (112) is no longer in contact with the rotating rod (10).

6. The burner with premixing and preheating function according to claim 5, characterized in that: A through hole (113) extending along the length direction of the second processing chamber (221) is formed through a side wall of the friction sleeve (11) facing the second partition plate (12); the through hole (113) is connected to the slot (111); and the pressure block (112) cuts off the through hole (113).

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