Anti-backfire torch combustion device

Abstract

The utility model relates to an anti-backfire torch combustion device, and belongs to the technical field of stone machining equipment. According to the utility model, the second chamber and the first chamber which are respectively positioned at the front part and the rear part are formed through the clearance fit of the rectifying part and the mixing part, and the inclined combustion channel is arranged to be connected with the combustion chamber, so that high pressure can be formed in the first chamber and the second chamber to prevent mixed gas backflow caused by negative pressure; according to the utility model, the combustion channel and the oxygen channel are communicated, the backfire phenomenon can be prevented, the inclined structures of the combustion channel and the oxygen channel can improve the mixing rectification efficiency, and the design of the conical step, the sealing element, the positive and negative threads and the like can further ensure the overall sealing effect, so that the combustion efficiency and the safety can be ensured.

Description

Technical Field

[0001] The utility model relates to a flashback-proof torch combustion device, belonging to the technical field of stone processing equipment. Background Art

[0002] In the process of stone processing, it is usually necessary to use a special drying gun for the flame-burning plate machine, and the performance of the drying gun combustion chamber will directly affect the ablation effect and the safety of the equipment.

[0003] In the current prior art, the combustion chamber of a traditional drying torch used for stone processing is usually provided with gas and oxygen pipelines that directly merge into the combustion chamber, so that the gas and oxygen are mixed and rectified and burned quickly, or the air smoke elimination type torch head shown in CN113739175A can further improve the efficiency. However, these technical means not only have the defects of uneven mixing of oxygen and gas and uneven combustion, but also often have the safety hazard of flashback in the combustion chamber.

[0004] At present, the only existing technology that involves the technical purpose of preventing flashback is a combustion chamber structure of a low NOx emission burner, such as that shown in CN115325536A. However, it is necessary to cut off the gas first to prevent flashback, which will greatly reduce the mixing rectification and combustion efficiency, and there is also the risk of manual operation.

[0005] Therefore, there is an urgent need to find a combustion device that can ensure combustion efficiency while meeting safety and preventing flashback. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a flashback-proof torch combustion device, comprising:

[0007] A rectifying member having a gas passage that allows low-pressure gas to pass through, an oxygen passage that allows high-pressure oxygen to pass through, and an inverted "V"-shaped rectifying interface that passes through the rectifying member;

[0008] A mixing piece is sleeved on the inner circumference of the rectifying interface of the rectifying piece, and the mixing piece has a tubular combustion chamber. There is a fitting gap between the inner circumference of the rectifying interface and the outer circumference of the mixing piece, and a first chamber connected to the oxygen channel and a second chamber connected to the gas channel are formed. The first chamber is located behind the second chamber, the first chamber is connected to the rear end of the combustion chamber, and the second chamber is coupled to the combustion chamber through at least two combustion channels.

[0009] It should be understood that in the present invention, the "rear" refers to the direction of the fairing relative to the mixing element, and the "front" refers to the direction of the mixing element relative to the fairing, and usually both the fuel gas and oxygen flow from the rear to the front.

[0010] Furthermore, the two ends of the gas channel are respectively a gas outlet connected to the rectifying interface and a gas inlet connected to the gas pipe, and the two ends of the oxygen channel are respectively an oxygen outlet connected to the rectifying interface and an oxygen inlet connected to the oxygen pipe. Generally, the gas outlet and the oxygen outlet are both located at the front end of the rectifying component, and the gas inlet and the oxygen inlet are both located at the rear end of the rectifying component.

[0011] The gas inlet and the oxygen inlet respectively have reverse threads and forward threads that can cooperate with the gas pipe fittings and the oxygen pipe fittings. At least a portion of the non-connecting surfaces of the gas pipe fittings and / or the oxygen pipe fittings have bamboo-jointed chamfered contact surfaces, which effectively prevent the gas pipe fittings and the oxygen pipe fittings from being disconnected when connected to other equipment.

[0012] Furthermore, the mixing element has, from back to front, a first conical step, an annular groove, a second conical step, a seal, and a mixing joint; wherein the first conical step and the second conical step are both allowed to cooperate with the rectifying interface, and the matching gap formed by the rear end of the first conical step and the inner circumference of the rectifying interface, and the matching gap formed by the annular groove and the inner circumference of the rectifying interface respectively form the first chamber and the second chamber, and the first chamber and the second chamber are respectively connected to the oxygen outlet and the gas outlet.

[0013] In some embodiments of the utility model, the second chamber is connected to the side of the combustion chamber through four combustion channels inclined toward the central axis of the combustion chamber, and the combustion channel forms an angle of 30 degrees with the central axis of the combustion chamber. There is an angle of 30 degrees between the oxygen channel and the central axis of the combustion chamber. Furthermore, the combustion channel has a trumpet-shaped structure with a diameter increasing along the direction of the combustion chamber relative to the second chamber. Once the combustion pressure is too large due to backfire, the oxygen pressure is high and negative pressure cannot be formed, so oxygen cannot bring in the fuel gas. Such a design can effectively prevent the mixed gas and oxygen from returning to the first and second chambers, thereby preventing the mixed gas from flowing back.

[0014] In some embodiments of the present invention, the sealing member includes a stopper and a sealing thread, the stopper is allowed to cooperate with the stopper groove on the inner circumference of the rectifying interface, and the sealing thread, the first conical step, and the second conical step are allowed to be hard-sealed with the inner circumference of the rectifying interface. At least a portion of the surface of the hybrid joint is covered with a sealant. The rectifying member and the hybrid member are both made of copper.

[0015] Beneficial effects of the utility model:

[0016] The utility model forms a second chamber and a first chamber located at the front and rear respectively by setting a clearance fit between a rectifying piece and a mixing piece, and provides an inclined combustion channel connected to the combustion chamber, which can not only form a high pressure in the first chamber and the second chamber to prevent the mixed gas from flowing back due to negative pressure, but also prevent the occurrence of backfire. The inclined structure of the combustion channel and the oxygen channel can also improve the mixing rectification efficiency, and the designs of the tapered steps, seals, positive and negative threads can further ensure the overall sealing effect, so that the utility model can ensure both combustion efficiency and safety.

[0017] Among them, the hard seal combination of the mixing element and the inverted V-shaped rectifier interface also has the following five advantages:

[0018] 1. Anti-leakage: The hard seal method uses the principle of physical isolation to complete the sealing work between components. Compared with other sealing methods (such as soft sealing methods), the hard seal is more reliable and can prevent liquid or gas leakage;

[0019] 2. High temperature resistance: Since the flame cutting nozzle and the gun body need to work continuously in the high temperature and high pressure cutting process, the use of hard seals can better resist the influence of high temperature and high pressure environment, thereby extending the service life of the communication work process;

[0020] 3. Damage resistance: The threaded contact part under the hard seal will be directly compressed to form an airtight joint, so the design of the sealing surface quality must be high. For example, the use of Yirui professional wear-resistant plate materials and composite flying mud heat return chrome spray body spare parts to reduce the impact of negative flames will not be directly damaged by heat pressure, and have a high ability to resist damage;

[0021] 4. Better stability: The special structure of the hard seal makes the seal stronger, with higher safety and stability under extreme load. The fastening force is evenly distributed, which can avoid the problem of overall instability caused by partial fastening leakage;

[0022] 5. Easy maintenance: Hard seals are small in shape, simple in structure, easy to maintain, and easy to clean and replace parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural cross-sectional view of a fairing component in one embodiment of the utility model;

[0024] Figure 2 This is a structural cross-sectional view of a mixing element in one embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of gas flow after the rectifying element and the mixing element are assembled in one embodiment of the utility model;

[0026] In the figure: 1. rectifier; 2. mixing element; 11. gas channel; 12. oxygen channel; 111. gas outlet; 112. gas inlet; 121. oxygen outlet; 122. oxygen inlet; 13. rectifier interface; 14. gas pipe fitting; 15. oxygen pipe fitting; 16. bamboo chamfered contact surface; 21. first conical step; 22. annular groove; 23. second conical step; 24. sealing element; 25. mixing joint; 26. combustion channel; 27. combustion chamber; 31. first chamber; 32. second chamber. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable 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, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] The utility model provides a flashback-proof torch combustion device, comprising:

[0032] The rectifying component 1 has a gas channel 11 that allows low-pressure gas to pass through, an oxygen channel 12 that allows high-pressure oxygen to pass through, and an inverted "V"-shaped rectifying interface that runs through the rectifying component; the two ends of the gas channel 11 are respectively a gas outlet 111 connected to the rectifying interface 13 and a gas inlet 112 connected to the gas pipe 14, and the two ends of the oxygen channel are respectively an oxygen outlet 121 connected to the rectifying interface 13 and an oxygen inlet 122 connected to the oxygen pipe 15. Generally, the gas outlet 111 and the oxygen outlet 121 are both located at the front end of the rectifying component 1, and the gas inlet 112 and the oxygen inlet 122 are both located at the rear end of the rectifying component 1;

[0033] The mixing element 2 is sleeved on the inner circumference of the rectifying interface 13 of the rectifying element 1, and the mixing element 2 has a tubular combustion chamber 27. There is a matching gap between the inner circumference of the rectifying interface 13 and the outer circumference of the mixing element 2, and a first chamber 31 connected to the oxygen channel 12 and a second chamber 32 connected to the gas channel 11 are formed. The first chamber 31 is located behind the second chamber 32, and the first chamber 31 is connected to the rear end of the combustion chamber 27. The second chamber 32 is coupled to the combustion chamber 27 through four combustion channels 26; the mixing element 2 has a first conical step 21, an annular groove 22, a second conical step 23, a sealing element 24, and a mixing joint 25 from back to front; wherein the first conical step 21 and the second conical step 23 are allowed to be connected with the The first conical step 21 is matched with the rectifying interface 13, and the matching clearance formed by the rear end of the first conical step 21 and the inner circumference of the rectifying interface 13, and the matching clearance formed by the annular groove 22 and the inner circumference of the rectifying interface 13 respectively form the first chamber 31 and the second chamber 32, and the first chamber 31 and the second chamber 32 are respectively connected to the oxygen outlet 121 and the gas outlet 111; the gas inlet 112 and the oxygen inlet 122 respectively have reverse threads and positive threads that can be matched with the gas pipe fitting 14 and the oxygen pipe fitting 15, and at least a part of the non-connecting surface of the gas pipe fitting 14 and / or the oxygen pipe fitting 15 has a bamboo chamfered contact surface 16, which effectively prevents the gas pipe fitting 14 and the oxygen pipe fitting 15 from being disconnected when connected with other equipment;

[0034] The seal 24 includes a stopper and a sealing thread. The stopper is allowed to cooperate with the stopper groove on the inner circumference of the rectifying interface. The sealing thread, the first conical step, and the second conical step are allowed to be hard-sealed with the inner circumference of the rectifying interface. At least a portion of the surface of the mixing joint 25 is covered with sealant and can be connected to the nozzle pipe of the drying gun. The rectifying part and the mixing part are both made of copper.

[0035] The “rear” refers to the direction of the fairing relative to the mixing element, and the “front” refers to the direction of the mixing element relative to the fairing. Usually, both the fuel gas and the oxygen flow from the rear to the front.

[0036] The second chamber 32 is connected to the side of the combustion chamber 27 through four combustion channels inclined toward the central axis of the combustion chamber 27, and the combustion channel 26 forms an angle of 30 degrees with the central axis of the combustion chamber 27. There is an angle of 30 degrees between the oxygen channel 12 and the central axis of the combustion chamber 27. Furthermore, the combustion channel has a trumpet-shaped structure with a diameter increasing along the direction of the combustion chamber relative to the second chamber.

[0037] Since the first chamber 31 is located at the rear of the second chamber 32, the low-pressure fuel gas will enter the combustion chamber 27 under the carrying effect of the high-pressure oxygen and be mixed and burned. When the fuel gas at the front end is about to backfire, the pressure in the combustion chamber 27 will increase sharply, and further negative pressure cannot be formed. The high-pressure oxygen cannot continue to carry the low-pressure fuel gas into the combustion chamber 27, and also prevents the fuel gas from continuing to enter, which can prevent the explosion caused by backfire and prevent the mixed gas from flowing back to the first and second chambers.

[0038] At the rear end, the bamboo-jointed chamfered contact surfaces 16 of the gas pipe 14 and the oxygen pipe 15 are respectively connected to the gas storage device and the oxygen generating device. On the one hand, the low-pressure gas enters the combustion chamber 27 evenly through the gas channel 11, the second chamber 32 and the four combustion channels 26. On the other hand, the high-pressure oxygen passes through the first chamber 31 and directly enters the combustion chamber 27 from the rear end of the combustion chamber 27 through the oxygen channel 12, and carries the low-pressure gas in front into the combustion chamber 27 and mixes and burns to form a mixed combustion gas, which is then output from the mixing joint 25.

[0039] Although the present invention has been disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A flashback-proof torch combustion device, characterized in that: include: A rectifying member having a gas passage that allows low-pressure gas to pass through, an oxygen passage that allows high-pressure oxygen to pass through, and an inverted "V"-shaped rectifying interface; A mixing piece is sleeved on the inner circumference of the rectifying interface of the rectifying piece, and the mixing piece has a tubular combustion chamber. There is a fitting gap between the inner circumference of the rectifying interface and the outer circumference of the mixing piece, and a first chamber connected to the oxygen channel and a second chamber connected to the gas channel are formed. The first chamber is located behind the second chamber, the first chamber is connected to the rear end of the combustion chamber, and the second chamber is coupled to the combustion chamber through at least two combustion channels.

2. The anti-flashback torch combustion device according to claim 1, characterized in that: The two ends of the gas channel are respectively connected to the gas outlet of the rectifying interface and the gas inlet of the gas pipe, and the two ends of the oxygen channel are respectively connected to the oxygen outlet of the rectifying interface and the oxygen inlet of the oxygen pipe.

3. The anti-flashback torch combustion device according to claim 2, characterized in that: There is an angle of 30 degrees between the oxygen channel and the central axis of the combustion chamber.

4. The anti-flashback torch combustion device according to claim 2, characterized in that: The gas inlet and the oxygen inlet respectively have reverse threads and forward threads that can cooperate with the gas pipe fittings and the oxygen pipe fittings, and at least a portion of the non-connecting surface of the gas pipe fittings and / or the oxygen pipe fittings has a bamboo chamfered contact surface.

5. The anti-flashback torch combustion device according to claim 2, characterized in that: The mixing element has, from back to front, a first conical step, an annular groove, a second conical step, a sealing element, and a mixing joint; wherein the first conical step and the second conical step are both allowed to cooperate with the rectifying interface, and the matching gap formed by the rear end of the first conical step and the inner circumference of the rectifying interface, and the matching gap formed by the annular groove and the inner circumference of the rectifying interface respectively form the first chamber and the second chamber, and the first chamber and the second chamber are respectively connected to the oxygen outlet and the gas outlet.

6. The anti-flashback torch combustion device according to claim 5, characterized in that: The second chamber is connected to the side of the combustion chamber through four combustion channels inclined toward the central axis of the combustion chamber, and the combustion channels form an angle of 30 degrees with the central axis of the combustion chamber.

7. The anti-flashback torch combustion device according to claim 5, characterized in that: The combustion channel has a trumpet-shaped structure with a diameter increasing gradually along a direction of the combustion chamber relative to the second chamber.

8. The anti-flashback torch combustion device according to claim 5, characterized in that: The seal comprises a limiter and a sealing thread, wherein the limiter is allowed to cooperate with a limit groove on the inner circumference of the rectification interface, and the sealing thread, the first conical step and the second conical step are allowed to perform a hard seal with the inner circumference of the rectification interface.

9. The anti-flashback torch combustion device according to claim 5, characterized in that: At least a portion of the surface of the hybrid joint is covered with sealant.

10. The anti-flashback torch combustion device according to claim 1, characterized in that: The rectifying element and the mixing element are both made of copper.

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