Fuel gas low-temperature tempering furnace

Abstract

The utility model discloses a fuel gas low-temperature tempering furnace, which comprises a furnace body, a furnace door, a lifting mechanism, a fuel gas heating device and a circulating fan, the fuel gas heating device comprises a combustor and a combustion pipeline, the combustion pipeline is arranged at the top in the furnace body in a manner of surrounding the inner circumference of the furnace body, and the circulating fan is positioned at the central position above the combustion pipeline; a mounting block is detachably assembled in a mounting notch of a furnace body, a combustion pipeline is assembled on the mounting block, a combustor is assembled in the inlet end of the combustion pipeline, and the size of the mounting notch is larger than that of the combustion pipeline; through the structural arrangement that the combustion pipeline is close to the circulating fan, heat generated by the combustion pipeline can be quickly guided into the furnace body through the circulating fan, so that the temperature rise in the furnace body is accelerated, and the heat loss is reduced; the mounting blocks are detachably assembled in the mounting notches, the combustion pipeline and the combustor can be assembled in the furnace body as a whole, modular structural design is achieved, and assembly and disassembly are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment equipment, in particular to a gas-fired low-temperature tempering furnace. Background Art

[0002] The tempering furnace in the heat treatment process is a periodic tempering furnace, which is used for tempering general metal parts after quenching, as well as quenching, annealing and aging heat treatment of light alloy parts such as aluminum alloy die castings, pistons, and air-filled bright tempering furnace aluminum plates. It is usually heated by electric heating elements, such as high-temperature resistance alloy wire wound in a strip or / and spiral shape, arranged in the furnace body, but the electric heating method has a relatively high electricity cost; so there are also gas heating to achieve heating and temperature rise in the furnace body to reduce energy consumption, but the existing gas heater is located in the furnace body. The layout and assembly and disassembly method need further research to speed up the temperature rise in the furnace body and facilitate the assembly and disassembly of the gas heater. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a gas-fired low-temperature tempering furnace which can accelerate the temperature rise in the furnace body and facilitate the installation and removal of the burner.

[0004] The technical solution to realize the utility model is as follows

[0005] A gas-fired low-temperature tempering furnace comprises a square furnace body with an inlet on one side, a furnace door forming a cover for the inlet, a lifting mechanism for lifting the furnace door, and a gas heating device for heating the furnace body, and a circulating fan at the top of the furnace body. The gas heating device comprises a burner and a combustion pipeline, the combustion pipeline is arranged at the top of the furnace body in a manner of surrounding the inner circumference of the furnace body, and the circulating fan is located in a central position above the combustion pipeline; an installation notch is provided above the side wall of the furnace body facing the inlet, a mounting block is detachably mounted in the installation notch, an inlet pipe mounting hole and an outlet pipe mounting hole connecting the inside and outside of the furnace body are provided on the mounting block, the inlet end of the combustion pipeline is mounted in the inlet pipe mounting hole, and the outlet end of the combustion pipeline is mounted in the outlet pipe mounting hole, extending to the outside of the furnace body; the burner is mounted in the inlet end of the combustion pipeline, and the size of the installation notch is larger than the size of the combustion pipeline;

[0006] A drainage hood is arranged below the circulation fan, and a drainage port is opened on the drainage hood. The drainage port is located directly below the circulation fan and at a central position below the combustion pipeline.

[0007] As an implementation scheme, a first connecting part is provided at the outer end of the mounting block, an embedded block is provided between the burner and the combustion pipe, a second connecting part is provided at the outer end of the embedded block, the first connecting part is connected to the second connecting part, and the second connecting part is connected to the outer end of the burner. The embedded block and the mounting block are blocks with thermal insulation material inside.

[0008] As an implementation scheme, the fuel pipe at the front end of the burner is exposed to the inner wall of the furnace body, a through hole is arranged in a ring on this section of the fuel pipe, the burner nozzle of the burner is close to the inner wall of the furnace body, and the inner wall of the embedded block around the burner nozzle is arranged toward an inclined surface.

[0009] As an implementation scheme, at least one retaining member is fixedly provided on the inner side of the mounting block, and the retaining member extends toward the inner wall of the furnace body opposite to the mounting block. The retaining member is connected to the combustion pipe, and a retaining plug-in connected to the retaining member is provided on the inner wall of the furnace body, and the retaining plug-in is inserted into the retaining member.

[0010] As an implementation scheme, a base is fixedly provided on the top of the furnace body, and two vertically arranged H-shaped brackets are fixedly installed above the base. A gas tank is placed horizontally between the two H-shaped brackets. The access end of the burner is connected to the outlet end of the gas tank through a first pipeline, and a compressed air pipeline is connected to the access end of the burner. At least a mass flow meter and a regulating valve are installed on the first pipeline and the compressed air pipeline, respectively.

[0011] As an implementation scheme, the air duct hood is formed in an N shape by splicing multiple plates together, and an air duct portion extends toward the bottom of the circulating fan at the top middle position of the air duct hood. The inner wall of the air duct portion forms a gradually narrowing air guide surface from bottom to top, and the air duct port is formed at the smallest end of the air guide surface. The inner diameter of the air duct port is smaller than the size of the circulating fan.

[0012] As an implementation scheme, a heat-insulating layer is laid on the inner wall of the furnace body, and the heat-insulating layer is formed by a plurality of heat-insulating blocks detachably assembled on the inner wall of the furnace body.

[0013] By adopting the above technical scheme, the combustion duct is arranged at the top of the furnace body in a manner of surrounding the inner circumference of the furnace body, and the circulating fan is located in a central position above the combustion duct. By arranging the combustion duct close to the circulating fan, the heat generated by the combustion duct can be quickly drained into the furnace body through the circulating fan, so that the temperature in the furnace body rises faster and the heat loss is reduced. The combustion duct and the burner can be detachably assembled in the mounting groove by the mounting block, so that the combustion duct and the burner can be assembled as a whole in the furnace body, realizing a modular structural design and facilitating assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a longitudinal internal schematic diagram of the utility model;

[0015] Figure 2 It is a horizontal internal schematic diagram of the utility model;

[0016] Figure 3 It is a side schematic diagram of the utility model;

[0017] Figure 4 It is a schematic diagram of the drainage hood in the utility model;

[0018] Figure 5 It is a schematic diagram of the burner and the combustion pipeline in the utility model;

[0019] Figure 6 It is a schematic diagram of the heat preservation block and the furnace body in the utility model;

[0020] In the accompanying drawings, 10, furnace body, 11, furnace door, 12, lifting mechanism, 13, circulation fan, 14, burner, 15, combustion pipeline, 16, mounting notch, 17, mounting block, 18, air hood, 19, air outlet, 20, air induction part, 21, workpiece placement space, 22, flow gap, 23, side plate, 24, top plate, 25, conical surface, 26, arc surface, 27, first connecting part, 28, embedded block, 29, second connecting part, 30, retaining member, 31. retaining plug-in, 32. fuel pipe, 33. inclined surface, 34. base, 35. H-shaped bracket, 36. gas tank, 37. first pipeline, 38. compressed air pipeline, 39. insulation block, 40. fixing rod, 41. fixing clamp, 42. hook part, 43. clamping block, 44. exhaust hood, 45. exhaust channel, 46. air outlet channel, 47. transmission roller group, 48. bottom frame, 49. support frame, 50. side bracket, 51. clamping block, 52. clamping slot. DETAILED DESCRIPTION

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0022] The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship. The reference to "embodiment" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0023] See also Figure 1As shown in FIG. 6 , a gas-fired low-temperature tempering furnace comprises a square furnace body 10 with an inlet on one side, a furnace door 11 which forms a cover for the inlet, and a lifting mechanism 12 for lifting the furnace door 11. During the tempering process, the furnace door 11 is lowered by the lifting mechanism 12 so that the furnace door 11 is in a closed state. When discharging materials, the furnace door 11 is lifted upward by the lifting mechanism 12 so that the furnace door 11 is opened and the workpieces in the furnace body 10 can be taken out. The lifting mechanism 12 can be implemented by a commonly used sprocket chain lifting mechanism; and a gas heating device for heating the furnace body 10, a circulating fan 13 at the top of the furnace body 10, the furnace body 10 is heated by the gas heating device, and the gas in the furnace body 10 is made to flow by the circulating fan 13 to ensure the temperature balance in the furnace body 10.

[0024] The gas heating device in the present application includes a burner 14 and a combustion pipe 15. The combustion pipe 15 is arranged at the top of the furnace body 10 in a manner of surrounding the inner circumference of the furnace body 10. The circulation fan 13 is located in the central position above the combustion pipe 15. By arranging the combustion pipe 15 close to the circulation fan 13 (generally, the burner is located at the bottom of the furnace body, and the circulation fan is located at the top of the furnace body. The distance between the two is relatively far, and the heat generated by the combustion pipe cannot be quickly drained and diffused in the furnace body in time, so the heating effect in the furnace body is relatively low), the heat generated by the combustion pipe 15 can be quickly drained into the furnace body 10 through the circulation fan 13, so that the temperature in the furnace body 10 rises faster and the heat is reduced. The amount of loss; a mounting notch 16 is provided on the upper side wall of the furnace body 10 facing the inlet, and a mounting block 17 is detachably mounted in the mounting notch 16, and an inlet pipe mounting hole and an outlet pipe mounting hole communicating with the inside and outside of the furnace body 10 are provided on the mounting block 17, the inlet end of the combustion pipe 15 is mounted in the inlet pipe mounting hole, and the outlet end of the combustion pipe 15 is mounted in the outlet pipe mounting hole, extending to the outside of the furnace body 10; the burner 14 is mounted in the inlet end of the combustion pipe 15, and the size of the mounting notch 16 is larger than that of the combustion pipe 15; the mounting block 17 is detachably mounted in the mounting notch 16, so that the combustion pipe 15 and the burner 14 can be assembled in the furnace body 10 as a whole, realizing a modular structural design and convenient assembly and disassembly.

[0025] In the implementation of this application, a drainage hood 18 is provided below the circulating fan 13, and a drainage port 19 is provided on the drainage hood 18. The drainage port 19 is located directly below the circulating fan 13 and in the central position below the combustion pipe 15, and a workpiece placement space is provided below the drainage hood 18. The drainage hood 18 is formed in an n-shape by splicing a plurality of plates, and an air induction portion 20 is provided at the top middle position of the drainage hood 18 to extend toward the bottom of the circulating fan 13. The inner wall of the air induction portion 20 forms a gradually shrinking air guide surface from bottom to top, and the drainage port 19 is formed at the smallest end of the air guide surface, and the inner diameter of the drainage port 19 is smaller than the size of the circulating fan 13. Both ends of the air duct 18 are open and a flow gap 22 is reserved between the inner wall of the furnace body 10. The two side surfaces of the air duct 18 are respectively formed by splicing three side panels 23. The side surfaces extend from the bottom of the combustion pipe 15 toward the inner bottom wall of the furnace body 10. The top of the air duct 18 is formed by splicing an air induction portion 20 and top panels 24 at both ends. A workpiece placement space 21 is formed between the top and side surfaces of the air duct 18. The air guide surface includes a conical surface 25 and an arc surface 26 constituting a drainage port 19 to guide the air. When the circulating fan 13 is working, the heat generated by the gas in the combustion pipe 15 can be radiated outward quickly, and a negative pressure is formed in the workpiece placement space through the circulating fan 13. The airflow in the workpiece placement space is guided by the wind guide surface, and heat is exchanged with the airflow around the combustion pipe 15 through the guide port 19. After the temperature is increased, it flows back to the workpiece placement space from the flow gap 22 at both ends of the guide wind hood 18, thereby accelerating the temperature increase of the airflow in the workpiece placement space to the surrounding of the combustion pipe 15 for heat exchange.

[0026] In the implementation of the present application, the outer end of the mounting block 17 is provided with a first connection portion 27, an embedded block 28 is provided between the burner 14 and the combustion pipe 15, and the outer end of the embedded block 28 is provided with a second connection portion 29, the first connection portion 27 is connected to the second connection portion 29, and the second connection portion 29 is connected to the outer end of the burner 14, and the embedded block 28 and the mounting block 17 are blocks with heat-insulating materials inside. The connection between the first connection portion 27 and the second connection portion 29, and the connection between the second connection portion 29 and the outer end of the burner 14 can be fixedly connected by welding, or can be connected by screws / bolts. When screws / bolts are used for connection, the assembly and disassembly of the burner 14 can be further facilitated.

[0027] In the implementation of the present application, at least one retaining member 30 is fixedly disposed on the inner side of the mounting block 17, and the retaining member 30 extends toward the inner wall of the furnace body 10 opposite to the mounting block 17. The retaining member 30 is connected to the combustion pipe 15, and a retaining plug-in 31 is disposed on the inner wall of the furnace body 10 to form a plug-in connection with the retaining member 30, and the retaining plug-in 31 is inserted into the retaining member 30. If the retaining member 30 is a tubular body, the retaining plug-in 31 is a tubular body adapted thereto for plug-in matching, so as to achieve docking between the retaining member 30 and the retaining plug-in 31, and further ensure the stability of the combustion pipe 15 arranged at the top of the furnace body 10, and ensure the overall stability of the furnace body 10 when the combustion pipe 15 and the mounting block 17 are assembled and disassembled as a modular system.

[0028] In the implementation of the present application, the fuel pipe 32 at the front end of the burner 14 is exposed to the inner wall of the furnace body 10, and a through hole is arranged in a ring on this section of the fuel pipe. The burner nozzle of the burner 14 is close to the inner wall of the furnace body 10, and the inner wall of the embedded block 28 around the burner nozzle is formed toward the inclined surface 33, so that the heat generated during the combustion process is conducted to the end of the combustion pipe 15.

[0029] In the implementation of this application, a base 34 is fixedly provided on the top of the furnace body 10, and two vertically arranged H-shaped brackets 35 are fixedly installed above the base 34. A gas tank 36 is placed horizontally between the two H-shaped brackets 35. The height of the base 34 from the top of the furnace body 10 separates the gas tank 36 from the furnace body 10 to maintain a corresponding safety distance. The access end of the burner 14 is connected with the outlet end of the gas tank 36 through a first pipe 37, and a compressed air pipe 38 is connected with the access end of the burner 14. At least a mass flow meter and a regulating valve are respectively installed on the first pipe 37 and the compressed air pipe 38 to accurately control the flow rate of gas and compressed air entering the burner 14, so as to ensure the accuracy of the air and gas ratio in the burner 14 and the air intake of the burner 14. The mass flow meter on the first pipeline 37 detects the flow of the gas. When the incoming flow does not match the setting, the opening degree of the corresponding regulating valve is controlled to make adjustments. Similarly, the mass flow meter on the compressed air pipeline 38 detects the incoming flow of compressed air. When the incoming flow does not match the setting, the opening degree of the air regulating valve is controlled to make adjustments, so as to more accurately match the corresponding ratios of the gas and compressed air entering the burner 14.

[0030] In the implementation of the present application, the inner wall of the furnace body 10 is paved with an insulation layer, and the insulation layer is formed by a plurality of insulation blocks 39 detachably assembled on the inner wall of the furnace body 10. Two fixing rods 40 and a fixing clamp 41 are fixedly arranged in the insulation block 39, and the two ends of the fixing clamp 41 are respectively formed to be rolled outward to hook the hook portion 42 of the fixing rod 40, and a clamp block 43 is fixedly assembled on the inner wall of the furnace body 10, and the clamp block has a clamping groove for the middle part of the fixing clamp 41 to be inserted, so as to clamp the insulation block to the inner wall of the furnace body 10, and the insulation blocks are sequentially clamped along the inner wall of the furnace body 10 to form the above-mentioned insulation layer.

[0031] In the implementation of this application, an exhaust hood 44 is installed above the furnace door 11, and the top of the exhaust hood 44 is connected to the exhaust channel 45. The interior of the exhaust hood 44 is a conical cavity that gradually narrows from the top of the furnace door 11 toward the exhaust channel 45. The exhaust duct 45 is also connected to an exhaust channel 46, and the exhaust channel 46 is connected to the top space in the furnace body 10. A control valve can be installed on the exhaust channel 46 to control the airflow in the furnace body 10 to be discharged from the exhaust channel, and the exhaust channel is connected to the exhaust gas discharge end of the combustion pipe 15 to carry out emission treatment together.

[0032] In the implementation of the present application, a transmission roller group 47 is arranged horizontally at the bottom of the furnace body 10, and the transmission roller group 47 is assembled on a bottom frame 48. The bottom of the bottom frame 48 is suspended on the bottom wall of the furnace body 10 by a support frame 49, and the side of the bottom frame 48 is limited in the furnace body 10 by a side bracket 50. One end of the side bracket 50 is fixedly set on the inner wall of the furnace body 10, and the other end extends toward the side of the bottom frame 48, that is, a clamping block 51 is fixedly assembled on the side of the bottom frame 48, and a clamping groove 52 is provided at one end of the side bracket 50 extending toward the side of the bottom frame 48 for the clamping block to be placed in, so as to form a limit, thereby ensuring that the bottom frame 48 is stably limited in the furnace body 10.

[0033] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention to illustrate the technical solution of the present invention, but are not intended to limit the technical solution, let alone the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. In addition, the direct or indirect application of the technical solution of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A gas-fired low-temperature tempering furnace, comprising a square furnace body with an inlet on one side, a furnace door for sealing the inlet, a lifting mechanism for lifting the furnace door, and a gas heating device for heating the furnace body, and a circulating fan at the top of the furnace body, wherein the furnace body is characterized in that: The gas heating device comprises a burner and a combustion pipeline. The combustion pipeline is arranged at the top of the furnace body in a manner of surrounding the inner circumference of the furnace body, and the circulating fan is located in the central position above the combustion pipeline. A mounting notch is provided above the side wall of the furnace body facing the inlet, and a mounting block is detachably mounted in the mounting notch. An inlet pipe mounting hole and an outlet pipe mounting hole connecting the inside and outside of the furnace body are provided on the mounting block. The inlet end of the combustion pipeline is mounted in the inlet pipe mounting hole, and the outlet end of the combustion pipeline is mounted in the outlet pipe mounting hole, extending to the outside of the furnace body. The burner is mounted in the inlet end of the combustion pipeline, and the size of the mounting notch is larger than the size of the combustion pipeline. A drainage hood is arranged below the circulation fan, and a drainage port is opened on the drainage hood. The drainage port is located directly below the circulation fan and at a central position below the combustion pipeline.

2. The gas-fired low-temperature tempering furnace according to claim 1, characterized in that: A first connection part is provided at the outer end of the mounting block, an embedded block is provided between the burner and the combustion pipe, a second connection part is provided at the outer end of the embedded block, the first connection part is connected to the second connection part, and the second connection part is connected to the outer end of the burner. The embedded block and the mounting block are blocks with insulation material inside.

3. The gas-fired low-temperature tempering furnace according to claim 1, characterized in that: The fuel pipe at the front end of the burner is exposed from the inner wall of the furnace body. A through hole is arranged in an annular manner on the fuel pipe in the furnace body. The burner nozzle of the burner is close to the inner wall of the furnace body. The inner wall of the embedded block around the burner nozzle is arranged toward an inclined surface.

4. The gas-fired low-temperature tempering furnace according to claim 1, characterized in that: At least one retaining member is fixedly arranged on the inner side of the mounting block, and the retaining member extends toward the inner wall of the furnace body opposite to the mounting block. The retaining member is connected to the combustion pipe, and a retaining plug-in connected with the retaining member is arranged on the inner wall of the furnace body, and the retaining plug-in is inserted into the retaining member.

5. The gas-fired low-temperature tempering furnace according to claim 1, characterized in that: A base is fixedly provided on the top of the furnace body, and two vertically arranged H-shaped brackets are fixedly installed above the base. A gas tank is placed horizontally between the two H-shaped brackets. The access end of the burner is connected with the outlet end of the gas tank through a first pipeline, and a compressed air pipeline is connected with the access end of the burner. At least a mass flow meter and a regulating valve are respectively installed on the first pipeline and the compressed air pipeline.

6. The gas-fired low-temperature tempering furnace according to claim 1, characterized in that: The air induction hood is formed in an N-shape by splicing multiple plates. An air induction portion extends toward the bottom of the circulation fan at the top middle position of the air induction hood. The inner wall of the air induction portion forms a gradually narrowing air guide surface from bottom to top. The air inlet is formed at the smallest end of the air guide surface, and the inner diameter of the air inlet is smaller than the size of the circulation fan.

7. The gas-fired low-temperature tempering furnace according to claim 1, characterized in that: The inner wall of the furnace body is paved with a heat-insulating layer, and the heat-insulating layer is formed by a plurality of heat-insulating blocks which are detachably assembled on the inner wall of the furnace body.

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