Aluminum alloy double-heat-storage furnace

Abstract

The aluminum alloy double-heat-storage furnace comprises a furnace body, a furnace cover, an electric control system, a combustion system, a reversing system and a ventilation system, the outer wall of the furnace body is composed of refractory bricks, the inner walls of the refractory bricks are covered with nanometer heat preservation materials, and a crucible is arranged in the furnace body; the combustion system comprises a left combustion system and a right combustion system which are symmetrically arranged left and right, the left combustion system comprises a left burner, the left burner is communicated with the crucible through a left air inlet / exhaust channel, the right combustion system comprises a right burner, and the right burner is communicated with the crucible through a right air inlet / exhaust channel; through alternate work of the left heat accumulator and the right heat accumulator and the heat exchanger, deep recovery of waste gas heat is achieved; due to the high-density small-hole structure of the ceramic heat accumulator in the heat accumulator, the contact area of waste gas and the heat accumulator is enlarged, and the heat recovery rate can be increased; the inner tee joint, the outer tee joint and the single reversing motor are synchronously switched, the number of valves and mechanical fault points are reduced, and the reliability of the device can be improved.

Description

Technical Field

[0001] The invention relates to a heat storage furnace, in particular to an aluminum alloy double heat storage furnace. Background Art

[0002] Aluminum alloy melting furnace is an energy-saving cycle operation furnace, mainly for aluminum alloy castings, aluminum alloy die castings, used for aluminum alloy melting and heat preservation treatment. The double heat storage furnace has the functions of heat storage and heat dissipation, which are performed alternately to recover heat, greatly improve heat energy loss, and achieve energy saving effects. At present, there are some common problems in aluminum alloy melting furnaces: the traditional heat storage combustion system uses a four-way valve to switch the airflow, and the valve seals are prone to aging and failure at high temperatures, resulting in a high air leakage rate; the traditional ceramic fiber insulation layer requires a thickness of 150-200mm to maintain the furnace wall temperature ≤100℃, resulting in a large equipment size and an increase of more than 40% in floor space; the furnace temperature of the traditional aluminum alloy melting furnace often fluctuates by ±25℃, affecting the uniformity of the aluminum alloy composition and resulting in a high scrap rate. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a technical solution as follows: an aluminum alloy double regenerative furnace, comprising a furnace body, a furnace cover, an electronic control system, a combustion system, a reversing system and a ventilation system, wherein the outer wall of the furnace body is composed of refractory bricks, the inner wall of the refractory bricks is covered with nano-insulation material, and a crucible is provided inside the furnace body;

[0004] The combustion system includes a left combustion system and a right combustion system that are symmetrically arranged on the left and right. The left combustion system includes a left burner, and the left burner is connected to the crucible through a left air inlet / exhaust channel. The right combustion system includes a right burner, and the right burner is connected to the crucible through a right air inlet / exhaust channel.

[0005] The left combustion system and the right combustion system are further provided with a heat accumulator and a heat exchanger, respectively. The left air inlet / exhaust channel and the right air inlet / exhaust channel are respectively connected to the heat exchanger through the heat accumulator; a porous ceramic heat accumulator is provided in the heat accumulator, and the heat exchanger is composed of an inner channel and an outer channel nested together, with a heat storage block welded to the inner channel wall and a heat sink welded to the outer channel wall;

[0006] The reversing system includes an inner tee and an outer tee, which are synchronously driven by a single motor to reverse direction through a coaxially connected switching flap; the inner tee is connected to the inner channel of the heat exchanger, and the outer tee is connected to the outer channel of the heat exchanger;

[0007] The ventilation system includes an exhaust fan, a blower and a combustion-supporting fan; the exhaust fan is connected to the inner three-way outlet, and the blower is connected to the outer three-way inlet;

[0008] A heat insulation board is provided inside the furnace body, and the heat insulation block is used to separate the left and right combustion systems to prevent heat from being directly discharged without passing through the periphery of the crucible.

[0009] Furthermore, when the left burner is working, the left inlet / exhaust channel is the air inlet and the right inlet / exhaust channel is the air exhaust; when the right burner is working, the right inlet / exhaust channel is the air inlet and the left inlet / exhaust channel is the air exhaust.

[0010] Furthermore, the heat accumulator is connected to the heat exchanger through a bottom channel.

[0011] Furthermore, the diameter of the honeycomb channels of the heat storage body ranges from 1 to 5 mm.

[0012] Furthermore, the heat storage block of the inner channel of the heat exchanger is a spiral fin structure, and the heat sink of the outer channel of the heat exchanger is a radial fin.

[0013] Furthermore, the combustion-supporting blower is connected to the left burner and the right burner to provide secondary combustion-supporting oxygen.

[0014] Furthermore, the furnace cover is opened and closed by a motor through a steel wire rope and a pulley.

[0015] Furthermore, the outer frame of the furnace is formed by pressing and welding steel plates, and the furnace body is filled with nano thermal insulation material.

[0016] The advantages of the present invention compared with the prior art are:

[0017] The present invention sets the smoke exhaust port above the burner, optimizes the smoke exhaust layout, makes the smoke fully contact with the heat storage body, and reduces heat loss; through the alternating operation of the left and right sets of heat storage devices and heat exchangers, the deep recovery of exhaust gas heat is achieved; the high-density small hole structure of the ceramic heat storage body in the heat storage device expands the contact area between the exhaust gas and the heat storage body, which can improve the heat recovery rate; the present invention adds a heat exchanger, extends the smoke exhaust channel, and discharges less heat, which can reduce energy consumption; adopts the design of synchronous switching of internal three-way valves, external three-way valves and a single reversing motor to replace the complex four-way valve of the traditional double heat storage furnace, reduce the number of valves and mechanical failure points, and improve the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an aluminum alloy double heat storage furnace of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the left side of an aluminum alloy double regenerative furnace of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the upper side of an aluminum alloy double regenerative furnace of the present invention.

[0021] Figure 4 It is a schematic diagram of the internal structure of an aluminum alloy double heat storage furnace of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the left interior of an aluminum alloy double regenerative furnace of the present invention.

[0023] Figure 6 It is a structural schematic diagram of the interior of the upper side of an aluminum alloy double regenerative furnace of the present invention.

[0024] Figure 7 This invention Figure 4 Schematic diagram of the structure of AA.

[0025] Figure 8 This invention Figure 4 Schematic diagram of the structure of BB.

[0026] Figure 9 The present invention is a schematic structural diagram of a steel wire rope steering wheel in an aluminum alloy double regenerative furnace.

[0027] 1. Left burner; 2. Left air inlet / exhaust duct; 3. Furnace heat channel; 4. Right air inlet / exhaust duct; 5. Right heat storage block; 6. Channel between the bottom of the right heat storage block and the bottom of the right heat exchanger; 7. Channel inside the right heat exchanger; 8. Exhaust three-way switch plate; 9. Exhaust fan; 10. Discharge port; 11. Air inlet for the air inlet fan; 12. Air inlet three-way switch plate; 13. Switching motor for the left and right channels of the air inlet and outlet three-way; 14. External channel of the right heat exchanger; 15. External channel at the bottom of the right heat exchanger; 16. Internal channel at the bottom of the left heat exchanger; 17. Channel between the bottom of the left heat exchanger and Left heat accumulator bottom connecting channel; 18, left heat storage block; 19, partition; 20, leakage port; 21, crucible; 22, nano thermal insulation material; 23, furnace cover; 24, heat accumulator; 25, heat exchanger; 26, refractory bricks; 27, electric control box; 28, furnace cover switch motor; 29, wire rope; 30, lifting lug; 31, left heat exchanger outer channel; 32, left heat exchanger inner channel; 33, air inlet pipe; 34, left heat exchanger outer channel bottom; 35, right heat exchanger inner channel bottom; 36, right burner; 37, furnace body; 38, wire rope steering wheel. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0030] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0031] In the description of the embodiments of the present invention, "a plurality of" means at least two.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] Example:

[0034] Combined with attachment Figure 1-9 This embodiment discloses an aluminum alloy double regenerative furnace, including a furnace body 37, a furnace cover 23, an electronic control system 27, a combustion system, a reversing system, and a ventilation system. The outer wall of the furnace body 37 is composed of refractory bricks 26, and the inner wall of the refractory bricks 26 is covered with nano-insulation material 22. A crucible 21 is provided inside the furnace body 37;

[0035] The combustion system includes a left combustion system and a right combustion system which are symmetrically arranged on the left and right sides. The left combustion system includes a left burner 1, which is connected to the crucible 21 through the left air inlet / exhaust channel 2. The right combustion system includes a right burner 36, which is connected to the crucible 21 through the right air inlet / exhaust channel 4. The left combustion system and the right combustion system are also respectively provided with a heat accumulator 24 and a heat exchanger 25. The left air inlet / exhaust channel 2 and the right air inlet / exhaust channel 4 are respectively connected to the heat exchanger 25 through the heat accumulator 24. Porous ceramic heat storage bodies 5 and 18 are arranged in the heat exchanger 25, and the heat exchanger 25 is composed of inner channels 7 and 32 and outer channels 14 and 31 nested together. The heat storage blocks are welded to the inner channel walls, and the heat sinks are welded to the outer channel walls. The heat storage body 24 is connected to the heat exchanger 25 through the bottom channels 6 and 17. The honeycomb pore diameter of the heat storage bodies 5 and 18 ranges from 1 to 5 mm. The heat storage blocks of the inner channels 7 and 32 of the heat exchanger are spiral fin structures, and the heat sinks of the outer channels 14 and 31 of the heat exchanger are radial fins.

[0036] The reversing system includes an inner tee 8 and an outer tee 12. The inner tee 8 and the outer tee 12 are synchronously driven by a single motor 13 through a coaxially connected switching flap. The inner tee 8 is connected to the inner channels 7 and 32 of the heat exchanger 25, and the outer tee 12 is connected to the outer channels 14 and 31 of the heat exchanger 25.

[0037] The ventilation system includes an exhaust fan 9, a blower 11 and a combustion-supporting fan; the exhaust fan 9 is connected to the outlet of the inner tee 8, and the blower 11 is connected to the inlet of the outer tee 12; the combustion-supporting fan is connected to the left burner 1 and the right burner 36 to provide secondary combustion-supporting oxygen.

[0038] When the left burner 1 is working, the left inlet / exhaust channel 2 is the air inlet and the right inlet / exhaust channel 4 is the air exhaust; when the right burner 36 is working, the right inlet / exhaust channel 4 is the air inlet and the left inlet / exhaust channel 2 is the air exhaust.

[0039] The furnace cover 23 is driven to open and close by a motor 28 through a steel wire rope 29 and a pulley 38; the outer frame of the furnace body 37 is formed by pressing and welding steel plates, and the furnace body 37 is filled with nano-insulation material 22; an insulation board 19 is provided inside the furnace body 37, and the insulation block 19 is used to separate the left and right combustion systems to prevent heat from being directly discharged without passing through the periphery of the crucible 21.

[0040] When the left burner is working: the left burner 1 is started, the combustion-supporting fan supplies oxygen to it, and the heat source 1 generated by the fuel combustion flows evenly through the periphery of the crucible 21 through the heat channel 3 in the furnace, heating the aluminum alloy raw material in the crucible 21; at this time, the left inlet / exhaust channel 2 serves as the return air outlet, introducing the high-temperature exhaust gas in the furnace into the right heat storage block 5 of the right heat accumulator 24.

[0041] The high-temperature exhaust gas passes through the right heat storage block 5 in the right heat accumulator 24, and its dense small hole structure disperses the exhaust gas, and the right heat storage block 5 absorbs the heat in the exhaust gas; the exhaust gas after absorbing heat enters the inner channel 7 of the right heat exchanger 25 through the bottom of the right heat storage block and the bottom channel 6 of the right heat exchanger, and the heat storage block welded to the inner channel 7 further disperses the airflow and absorbs heat, and the heat is transferred to the outer channel 14 through the heat sink welded on the periphery of the inner channel.

[0042] The exhaust fan 9 draws the exhaust gas from the inner channel 7 of the right heat exchanger through the exhaust tee switching plate of the inner tee 8 and discharges it through the exhaust port 10; at the same time, the blower 11 draws air from the air inlet 11 and guides it to the air inlet tee switching plate of the outer tee 12 through the air inlet pipe 33; since the inner tee 8 and the outer tee 12 are switched synchronously by the reversing motor 13, the outer tee 12 now guides the air into the outer channel 31 of the left heat exchanger. When the air flows through the outer channel 31, it absorbs the heat from the heat sink of the inner channel 32, forming a hot air flow.

[0043] The hot air flows through the outer channel 34 at the bottom of the left heat exchanger and the connecting channel 17 between the bottom of the left heat exchanger and the bottom of the left heat accumulator, and enters the left heat storage block 18 of the left heat accumulator 24. The heat stored in the left heat storage block 18 in the left heat accumulator 24 is carried by the hot air flow and transported back to the furnace through the left air inlet / exhaust channel 2, completing the heat circulation when the left burner is working.

[0044] When the right burner 36 is working: the right burner 36 is started, the reversing motor 13 drives the inner tee 8 and the outer tee 12 to switch synchronously, and the air flow direction is completely opposite to that when the left burner is working. The heat source generated by the right burner 36 heats the crucible 21 through the hot channel 3 in the furnace, and the exhaust gas enters the left heat accumulator 24 through the right inlet / exhaust channel 4. After the heat accumulator 18 absorbs heat, the exhaust gas is discharged through the inner channel 32 and the inner tee 8 of the left heat exchanger.

[0045] The air delivered by the blower 11 enters the outer channel 14 of the right heat exchanger through the outer tee 12, absorbs the heat from the radiator fins of the inner channel 7, and then enters the right heat accumulator 24 through the outer channel 15 at the bottom of the right heat exchanger, the bottom of the right heat storage block and the bottom channel 6 of the right heat exchanger, bringing the heat of the heat storage body 5 back to the furnace, realizing the alternating operation of the left and right systems.

[0046] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0047] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An aluminum alloy double regenerative furnace, comprising a furnace body (37), a furnace cover (23), an electric control system (27), a combustion system, a reversing system and a ventilation system, characterized in that: The outer wall of the furnace body (37) is composed of refractory bricks (26), the inner wall of the refractory bricks (26) is covered with nano thermal insulation material (22), and a crucible (21) is provided inside the furnace body (37); The combustion system comprises a left combustion system and a right combustion system which are symmetrically arranged on the left and right sides, wherein the left combustion system comprises a left burner (1), and the left burner (1) is connected to the crucible (21) through a left air inlet / exhaust channel (2), and the right combustion system comprises a right burner (36), and the right burner (36) is connected to the crucible (21) through a right air inlet / exhaust channel (4); The left combustion system and the right combustion system are further provided with a heat accumulator (24) and a heat exchanger (25), respectively. The left air inlet / exhaust channel (2) and the right air inlet / exhaust channel (4) are respectively connected to the heat exchanger (25) through the heat accumulator (24). A porous ceramic heat accumulator (5, 18) is provided in the heat accumulator (24). The heat exchanger (25) is composed of an inner channel (7, 32) and an outer channel (14, 31) nested together. The inner channel wall is welded with a heat storage block, and the outer channel wall is welded with a heat sink. The reversing system comprises an inner tee (8) and an outer tee (12), wherein the inner tee (8) and the outer tee (12) are synchronously driven by a single motor (13) to reverse via a coaxially connected switching flap; the inner tee (8) is connected to the inner channel (7, 32) of the heat exchanger (25), and the outer tee (12) is connected to the outer channel (14, 31) of the heat exchanger (25); The ventilation system comprises an exhaust fan (9), a blower (11) and a combustion-supporting fan; the exhaust fan (9) is connected to the outlet of the inner tee (8), and the blower (11) is connected to the inlet of the outer tee (12); A heat insulation board (19) is provided inside the furnace body (37). The heat insulation board (19) is used to separate the left and right combustion systems to prevent heat from being discharged directly without passing through the periphery of the crucible (21).

2. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: When the left burner (1) is working, the left air inlet / exhaust channel (2) is the air inlet, and the right air inlet / exhaust channel (4) is the air outlet; when the right burner (36) is working, the right air inlet / exhaust channel (4) is the air inlet, and the left air inlet / exhaust channel (2) is the air outlet.

3. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: The heat accumulator (24) is connected to the heat exchanger (25) through the bottom channel (6, 17).

4. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: The diameter of the honeycomb channels of the heat storage bodies (5, 18) ranges from 1 to 5 mm.

5. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: The heat storage blocks of the inner channels (7, 32) of the heat exchanger are spiral fin structures, and the heat sinks of the outer channels (14, 31) of the heat exchanger are radial fins.

6. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: The combustion-supporting blower is connected to the left burner (1) and the right burner (36) to provide secondary combustion-supporting oxygen.

7. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: The furnace cover (23) is driven to open and close by a motor (28) through a steel wire rope (29) and a pulley (38).

8. The aluminum alloy double regenerative furnace according to claim 1, characterized in that: The outer frame of the furnace body (37) is formed by pressing and welding steel plates, and the furnace body (37) is filled with nano thermal insulation material (22).

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