Molten liquid holding furnace

Abstract

The utility model provides a melt heat preservation furnace which comprises a furnace body, a heating chamber is arranged on the furnace body, a liquid injection nozzle and a combustion nozzle are arranged on the furnace body, the liquid injection nozzle is used for injecting melt into the heating chamber, the combustion nozzle is used for igniting and combusting to heat the melt contained in the heating chamber, the liquid injection nozzle is provided with a liquid inlet port and a liquid guide pipeline connected with the liquid inlet port, and the liquid guide pipeline is communicated with the liquid inlet port. The liquid guide pipeline extends into the heating chamber, and an outlet of the liquid guide pipeline is lower than a nozzle opening of the burner in the heating chamber. According to the utility model, the outlet of the liquid guide pipeline is arranged to be lower than the nozzle opening of the combustion nozzle, so that the outlet of the liquid guide pipeline can be ensured to be immersed below the liquid level in the heating chamber when heat preservation is carried out on the melt, the melt cannot splash to influence flames when the melt is injected into the heating chamber, and heat generated by combustion cannot be dissipated from the liquid injection nozzle.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of smelting furnace, especially to a molten metal heat preservation furnace. BACKGROUND

[0002] The smelting furnace is a common industrial furnace for melting metal, and the molten metal is poured into a mold for casting. According to the different metals, the common smelting furnaces include a smelting iron furnace, a smelting aluminum furnace, a smelting copper furnace, etc. According to the heating source, there are electric smelting furnaces or gas smelting furnaces. Generally, the temperature of the smelting furnace is high. After the metal is melted, the molten metal needs to be taken out in time so as to maintain the high temperature for melting the metal block. If the temperature is lowered for energy saving, the molten state in the smelting furnace cannot be maintained, which is not conducive to the subsequent melting of the metal block. If the molten metal is directly scooped out from the smelting furnace, it is too high in temperature and is not conducive to the subsequent forming process. Therefore, the smelting furnace is generally used in combination with a molten metal heat preservation furnace for pouring and forming. The molten metal heat preservation furnace, also known as a transfer storage furnace, can transfer the molten metal in the smelting furnace to the molten metal heat preservation furnace first, and then scoop out or guide the molten metal to the forming mold. The molten metal in the smelting furnace will not directly enter the forming mold from the smelting furnace. In this way, it is beneficial to store a large amount of molten metal and use the molten metal, and it is also beneficial to energy saving. Since the gas produces waste gas and the waste gas takes away heat, the heat is easily lost. Therefore, the molten metal heat preservation furnace in the industry generally adopts electric heat preservation or electric heat preservation. The molten metal heat preservation furnace that uses gas alone is less. There is also a molten metal heat preservation furnace that uses gas in the industry. However, the structure design is not energy-saving, and the heat is easily lost. CONTENT OF THE UTILITY MODEL

[0003] In view of the above, the utility model provides a molten metal heat preservation furnace that uses gas for heating, which is beneficial to heat preservation and energy saving.

[0004] The technical solution of the utility model relates to:

[0005] A molten metal heat preservation furnace includes a furnace body with a heating chamber. The furnace body is provided with a molten metal injection nozzle and a combustion nozzle. The molten metal injection nozzle is used for injecting molten metal into the heating chamber. The combustion nozzle is used for igniting and burning to heat the molten metal contained in the heating chamber. The molten metal injection nozzle has a molten metal inlet port and a molten metal guide pipe connected with the molten metal inlet port. The molten metal guide pipe extends into the heating chamber, and the outlet of the molten metal guide pipe is lower than the nozzle opening of the combustion nozzle in the heating chamber.

[0006] Further, the molten metal inlet port has a wide-diameter end and a tapered end. The wide-diameter end is used for containing and connecting the molten metal. The tapered end connects the wide-diameter end and the molten metal guide pipe.

[0007] Further, the top wall of the furnace body is in a stepped shape, including a lower stepped wall and an upper stepped wall. The lower stepped wall and the upper stepped wall enclose a combustion space in the heating chamber. The molten metal injection nozzle is installed on the lower stepped wall, and the combustion nozzle is installed on the upper stepped wall or the side of the heating chamber wall opposite to the lower stepped wall.

[0008] Furthermore, the furnace body includes a heating furnace body and a liquid extraction furnace body connected to the heating furnace body. The heating furnace body is provided with the liquid injection nozzle and the combustion nozzle, and the liquid extraction furnace body has a receiving cavity for liquid extraction.

[0009] Furthermore, a partition wall is formed between the heating furnace body and the liquid extraction furnace body, and a connecting hole is provided at the bottom of the partition wall to allow the molten liquid in the heating chamber to flow into the receiving cavity.

[0010] Furthermore, the bottom surface of the furnace chamber of the liquid extraction furnace is lower than the bottom surface of the furnace chamber of the heating furnace.

[0011] Furthermore, the top of the accommodating cavity is provided with a liquid intake port for scooping molten liquid, and the bottom of the accommodating cavity is provided with a drain hole and a valve.

[0012] Furthermore, the molten metal holding furnace includes a liquid level monitor, which is installed on the heating furnace body or the liquid extraction furnace body to monitor the liquid level of the molten metal.

[0013] Furthermore, the liquid level monitor is installed at the liquid intake port of the liquid intake furnace body. The liquid level monitor includes two guide rods, which are respectively connected to the two poles of the alarm. One rod is longer than the other and extends into the accommodating cavity to a preset height through the liquid intake port.

[0014] Furthermore, the molten metal holding furnace includes an injection port sealing structure for sealing or opening the injection nozzle. The injection port sealing structure includes a cover body and a cover body driving component. The cover body is hinged to the outside of the injection nozzle, and the cover body driving component is used to drive the cover body to open or close.

[0015] Compared to existing technologies, this utility model of a molten metal holding furnace ensures that the outlet of the liquid guiding pipe is submerged below the liquid surface in the furnace chamber when the molten metal is being held in place. This prevents the molten metal from splashing and affecting the flame when it is injected into the furnace chamber, and also prevents the heat generated by combustion from dissipating from the injection nozzle. Attached Figure Description

[0016] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the molten metal holding furnace of this utility model;

[0017] Figure 2 for Figure 1 A second-view perspective three-dimensional schematic diagram of the molten metal holding furnace;

[0018] Figure 3 for Figure 1 The diagram shown is an exploded view of the molten metal holding furnace.

[0019] Figure 4 for Figure 1 A three-dimensional schematic diagram of the furnace body of the molten metal holding furnace shown;

[0020] Figure 5 for Figure 4 a cross-sectional view of the melt shown in Fig. 1;

[0021] Figure 6 for Figure 1 a perspective view of the cover of the melt holding furnace shown in Fig. 1;

[0022] Figure 7 for Figure 1 a cross-sectional view of the melt holding furnace shown in Fig. 1;

[0023] Figure 8 for Figure 1 a schematic view of the reversing valve in the melt holding furnace shown in Fig. 1;

[0024] Figure 9 a partial cross-sectional view of a heat storage brick as a heat storage body.

[0025] In the drawings, the furnace body 11, the liquid injection nozzle 12, the combustion nozzle 13, the liquid inlet port 121, the liquid guide pipe 122, the wide caliber end 1211, the tapered end 1212, the heating furnace body 111, the liquid taking furnace body 112, the heating chamber 101, the accommodating cavity 102, the partition wall 103, the communication hole 104, the liquid discharge hole 105, the air blower 14, the liquid level monitor 15, the air reversing valve 31, the first heat storage body 32, the second heat storage body 33, the air blower 34, the smoke window 35, the valve 310, the first valve port 311, the second valve port 312, the third valve port 313, the fourth valve port 314, the air guide hole 106, the air guide cavity 321, the air collection groove 322, the smoke window 35, the air extractor 36, the top seat 21, the cover 41, the window door 51. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the protection scope of the present application.

[0027] Please refer to Figure 1 , Figure 2 The present application provides a melt holding furnace, which comprises a furnace body 11 having a hearth, the furnace body 11 is provided with a liquid injection nozzle 12 and a combustion nozzle 13 extending into the hearth, the melt is poured into the hearth through the liquid injection nozzle 12, the liquid surface in the hearth is heated by igniting and burning through the combustion nozzle 13, so that the required temperature is maintained in the hearth.

[0028] Please refer to Figure 5The liquid injection nozzle 12 has a liquid inlet port 121 and a liquid guide pipe 122 connected with the liquid inlet port 121. The liquid guide pipe 122 extends into the furnace to a predetermined depth, and the outlet of the liquid guide pipe 122 is lower than the nozzle of the combustion nozzle 13 (i.e. the flame outlet). In this way, when the molten liquid is kept warm, the outlet of the liquid guide pipe 122 is submerged below the liquid level in the furnace. When the molten liquid is added into the furnace, the molten liquid will not splash and affect the flame, and the heat generated by combustion will not be dissipated from the liquid injection nozzle 12.

[0029] Preferably, the liquid inlet port 121 is funnel-shaped, having a wide diameter end 1211 for containing the molten liquid, and a tapered end 1212 connected with the wide diameter end 1211 and the liquid guide pipe 122. Preferably, the wide diameter end 1211 is cylindrical, and the liquid guide pipe 122 is a circular pipe with an inner diameter smaller than that of the wide diameter end 1211. The end of the liquid guide pipe 122 protrudes from the wall of the heating chamber by a pipe segment of a predetermined length, so that the end of the liquid guide pipe 122 can be submerged in the molten liquid.

[0030] Preferably, the top wall of the furnace body 11 is stepped, including a lower step wall and an upper step wall, so that the lower step wall and the upper step wall enclose a combustion space in the furnace. The liquid injection nozzle 12 is mounted on the lower step wall, and the combustion nozzle 13 is mounted on the upper step wall or on the side of the furnace wall opposite to the lower step wall, so that the nozzle of the combustion nozzle 13 is higher than the outlet of the end of the liquid guide pipe 122.

[0031] Please refer to Figure 3 、 Figure 4 In this embodiment, the furnace body 11 includes a heating furnace body 111 and a liquid taking furnace body 112 in communication with the heating furnace body 111. The heating furnace body 111 is provided with a heating chamber 101 (i.e. a furnace). The liquid injection nozzle 12 and the combustion nozzle 13 are mounted on the heating furnace body 111 and extend into the heating chamber 101. The liquid injection nozzle 12 is used to inject molten liquid into the heating chamber 101, and the combustion nozzle 13 is used to ignite and burn to provide heat in the heating chamber 101. The liquid taking furnace body 112 has a receiving cavity 102. A partition wall 103 is formed between the heating furnace body 111 and the liquid taking furnace body 112 to separate the heating chamber 101 and the receiving cavity 102, so as to prevent the heat or gas generated by combustion in the heating furnace body 111 from entering the receiving cavity 102 of the liquid taking furnace body 112. The bottom of the partition wall 103 is provided with a communication hole 104, so that the molten liquid in the heating chamber 101 can flow into the receiving cavity 102.

[0032] Further, the top end of the receiving cavity 102 is provided with a liquid taking opening for scooping the molten liquid, and the bottom end of the receiving cavity 102 is provided with a liquid discharge hole 105 for draining the molten liquid. It can be understood that the liquid discharge hole 105 is provided with an opening and closing mechanism for opening or closing the liquid discharge hole 105.

[0033] Preferably, the bottom surface of the containing cavity 102 of the liquid taking furnace is lower than the bottom surface of the heating chamber 101 of the heating furnace, and preferably, the bottom surface of the heating chamber 101 is inclined to the bottom surface of the containing cavity 102, so that the molten liquid in the heating chamber 101 can flow into the containing cavity 102.

[0034] It is understood that when the molten liquid holding furnace is in use, the molten liquid is injected into the heating chamber through the liquid injection nozzle 12 until the liquid reaches a predetermined height, and the end of the liquid guide pipe 122 of the liquid injection nozzle 12 is immersed.

[0035] It is understood that the combustion nozzle 13 is connected with an air supply pipe and a gas pipe (not shown in the figure), the air supply pipe is connected with the air blower 14 to supply air to the air supply pipe, and the gas pipe is connected with a gas pipeline or a gas cylinder to supply gas to the gas pipe, so that after the combustion nozzle 13 is ignited, the nozzle of the combustion nozzle 13 will burn. In this way, heat is supplied to the heating chamber, thereby heating the molten liquid and maintaining the temperature of the molten liquid.

[0036] It is understood that the molten liquid holding furnace includes a liquid level monitor 15 installed on the heating furnace 111 or the liquid taking furnace 112 to monitor the liquid level of the molten liquid, and when the liquid level exceeds the corresponding liquid level, an alarm will be activated to prevent excessive addition of molten liquid from the liquid injection nozzle 12, and the liquid level will be immersed in the combustion nozzle 13, which will damage the combustion nozzle 13 or cause the molten liquid to overflow from the liquid taking port at the top of the containing cavity 102.

[0037] In this embodiment, the liquid level monitor 15 is installed at the liquid taking port of the liquid taking furnace 112, and the liquid level monitor 15 includes two conductive rods connected to the two poles of an alarm, one long and one short, which extend into the containing cavity 102 at a predetermined height through the liquid taking port. If the liquid level is below the long conductive rod, it indicates that the molten liquid should continue to be added, and when the liquid level of the molten liquid is immersed in the short conductive rod, the two conductive rods will be electrically connected through the liquid level, which will trigger an alarm, so that the liquid addition should be stopped.

[0038] The molten liquid holding furnace includes a heat exchange structure to make full use of heat. Specifically, please refer to Figure 6- Figure 8The heat exchange structure comprises a ventilation valve 31, a first heat accumulator 32, a second heat accumulator 33, a blower 34 and a smoke window 35. The ventilation valve 31 is a four-way valve and is provided with a valve 310. The first heat accumulator 32 and the second heat accumulator 33 are both provided with pipe interfaces at two ends. The first heat accumulator 32, the second heat accumulator 33, the blower 34 and the smoke window 35 are respectively connected to four valve ports of the four-way valve. The other ends of the first heat accumulator 32 and the second heat accumulator 33 are respectively communicated to the heating chamber. The ventilation valve 31 is used for switching the air flow direction and can form two air paths. The first air path is that the blower 34 blows the air into the first heat accumulator 32, the air passes through the heating chamber 101 and the second heat accumulator 33, and then is discharged from the smoke window 35. The second air path is that the blower 34 blows the air into the second heat accumulator 33, the air passes through the heating chamber 101 and the first heat accumulator 32, and then is discharged from the smoke window 35. The ventilation valve 31 switches the two air paths in time through the valve 310, so that the waste heat can be fully utilized. The specific principle is that the external air is blown into the first heat accumulator 32, the high-heat waste gas enters the second heat accumulator 33 after passing through the heating chamber 101, the second heat accumulator 33 is heated and stored heat, and then the tail gas is discharged from the smoke window 35. After the first air path operates for a preset time, the second heat accumulator 33 has been fully stored heat, then the ventilation valve switches the air path, the external air is blown into the second heat accumulator 33, the heat stored in the second heat accumulator 33 is brought into the heating chamber 101 for utilization, at the same time, the second heat accumulator 33 is cooled by heat dissipation, the waste gas in the heating chamber 101 flows through the first heat accumulator 32, the first heat accumulator 32 is heated and stored heat, and then the tail gas is discharged from the smoke window 35. In this way, the waste heat stored in the second heat accumulator 33 is fully utilized, and the waste heat of the discharged waste gas is stored by the first heat accumulator 32. The ventilation valve 31 switches in time, so that the heat in the waste gas can be fully utilized.

[0039] Specifically, as shown in Figure 8 , the ventilation valve 31 is provided with a first valve port 311 on one side, a second valve port 312 on the other side, a third valve port 313 at the bottom end and a fourth valve port 314 at the top end. The first heat accumulator 32 is connected to the first valve port 311, the second heat accumulator 33 is connected to the second valve port 312, the blower 34 is connected to the third valve port 313, and the smoke window 35 is connected to the fourth valve port 314. The figure shows that the ventilation valve 31 is switched to the first air path state. After the first air path operates for a preset time, the valve 310 of the ventilation valve 31 is switched (as shown by the dashed line) to the second air path state.

[0040] The first heat accumulator 32 and the second heat accumulator 33 are arranged side by side on the heating furnace body 111 and are respectively communicated with the heating chamber 101 of the heating furnace body 111. It can be understood that two air guide holes 106 are formed in the top wall of the heating furnace body 111 and are respectively used for communicating the first heat accumulator 32 and the second heat accumulator 33. In the embodiment, the two air guide holes 106 are respectively located on the two sides of the combustion nozzle 13 in the heating chamber 101.

[0041] Preferably, the first heat storage body 32 and the second heat storage body 33 are made of heat storage bricks, and the heat storage bricks are surrounded by heat insulation plates. The heat storage bricks are provided with honeycomb holes for the gas flow to pass through. In this embodiment, the heat storage body comprises a cylinder cover and a brick column received in the cylinder cover. The cylinder cover is closed at the top end and forms a gas guiding cavity 321 at the top end of the cylinder cover with the heat storage bricks received therein. The valve port of the air exchange valve 31 is connected to the gas guiding cavity 321, so that the gas flow blown by the blower 34 flows into the cavity 321 at the top of the heat storage body through the valve port, and then flows through the heat storage bricks into the heating chamber 101.

[0042] As can be understood, the top surface of the bottommost heat storage brick is provided with a gas collecting groove, and a through hole is formed in the bottom surface of the gas collecting groove and connected to the gas guiding hole 106 formed in the top wall of the heating chamber 101, so that the gas flow passing through the heat storage body is fully guided into the heating chamber 101. As shown in the figure, the gas collecting groove 322 can also be formed in the bottom surface of the bottommost heat storage brick and connected to the gas guiding hole 106. Alternatively, a support block can be arranged on the top wall of the heating chamber 101 corresponding to the gas guiding hole, and the support block supports the brick column and surrounds a gas collecting cavity. The gas flow of the honeycomb holes of the heat storage bricks flows into the gas collecting cavity, and the gas in the gas collecting cavity flows into the heating chamber through the gas guiding hole. Figure 9

[0043] The blower 34 is installed on the top surface of the heating furnace body 111, and is preferably arranged between the first heat storage body 32 and the second heat storage body 33. The blower 34 is connected to the third valve port 313 of the air exchange valve 31 for blowing gas.

[0044] The smoke window 35 is connected to the fourth valve port 314 of the air exchange valve 31 for discharging the exhaust gas after passing through the heat storage body.

[0045] As can be understood, in order to improve the exhaust efficiency, an exhaust fan 36 can be further arranged at the smoke window 35 for exhausting air to improve the exhaust speed of the exhaust gas in the heating chamber. When it is not necessary to improve the exhaust speed of the exhaust gas, the exhaust fan 36 can be disabled.

[0046] Further, in order to facilitate modular assembly, the molten liquid holding furnace comprises a top seat 21 matched with the furnace body 11. The heat exchange structure 30 is installed on the top seat 21, and then the top seat 21 is installed on the top surface of the furnace body 11.

[0047] ​Further, the injection hole cover structure is further included for covering or opening the liquid injection nozzle 12, the injection hole cover structure includes a cover body 41 and a cover body driving member (not shown in the figure), the cover body 41 is hinged on the outside of the liquid injection nozzle 12, and the cover body driving member is used for driving the cover body 41 to open or close. In the embodiment, the cover body driving member is connected to the cover body 41 through a lifting rope, and the cover body is opened by pulling up the lifting rope, and the cover body is closed (under the action of the self weight of the cover body) by relaxing the lifting rope, and the cover body driving member is preferably selected as an electric motor.

[0048] Further, a window is arranged on the outside of the heating furnace body 111, and a window door 51 is correspondingly arranged, and the size of the flame in the hearth can be observed in real time by opening the window door 51.

[0049] Further, the furnace body 11 is further provided with temperature detectors, one of which is inserted into the heating chamber of the heating furnace for detecting the temperature in the heating chamber, and the other of which is inserted into the accommodating cavity 102 of the liquid taking furnace body for detecting the temperature of the molten liquid.

[0050] Further, the liquid taking opening of the liquid taking furnace body is provided with a cover plate (not shown in the figure), the cover plate is opened when the liquid is taken, and the liquid taking opening is covered when the liquid is not taken, so that the heat loss is reduced.

[0051] In summary, the molten liquid heat preservation furnace can ensure that the outlet of the liquid guide pipeline 122 is immersed below the liquid level in the heating chamber when the molten liquid is preserved, and when the molten liquid is injected into the heating chamber, the molten liquid will not splash the flame, and the heat generated by combustion will not be dissipated from the liquid injection nozzle 12.

[0052] In addition, by arranging the heat exchange structure 30, the waste heat of the exhaust gas discharged from the heating chamber is stored in the heat storage body, the air sent in is heated by the heat storage body, the air entering the heating chamber 101 is heated by the waste heat, the waste heat of the exhaust gas is fully utilized, and the utilization rate of the waste heat of the exhaust gas is greatly improved by the circulation of the two heat storage bodies.

[0053] The above only describes the embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion according to the content of the utility model specification, or direct or indirect application in other related technical fields, are all included in the patent protection range of the utility model.

Claims

1. A molten metal holding furnace, comprising a furnace body (11) having a heating chamber (101), wherein the furnace body (11) is provided with a liquid injection nozzle (12) and a combustion nozzle (13), the liquid injection nozzle (12) being used to inject molten metal into the heating chamber (101), and the combustion nozzle (13) being used for ignition and combustion to heat the molten metal contained in the heating chamber (101), characterized in that: The injection nozzle (12) has an inlet port (121) and a liquid guide pipe (122) connected to the inlet port (121). The liquid guide pipe (122) extends into the heating chamber (101), and the outlet of the liquid guide pipe (122) is lower than the mouth of the burner (13) in the heating chamber (101).

2. The molten metal holding furnace according to claim 1, characterized in that, The liquid inlet port (121) has a wide-diameter end (1211) and a tapered end (1212). The wide-diameter end (1211) is for receiving molten liquid, and the tapered end (1212) connects the wide-diameter end (1211) to the liquid guiding pipe (122).

3. The molten metal holding furnace according to claim 1, characterized in that, The top wall of the furnace body (11) is stepped, including a lower step wall and an upper step wall. The lower step wall and the upper step wall form a combustion space in the heating chamber (101). The liquid injection nozzle (12) is installed on the lower step wall, and the burner (13) is installed on the upper step wall or on the side of the heating chamber (101) opposite to the lower step wall.

4. The molten metal holding furnace according to claim 1, characterized in that, The furnace body (11) includes a heating furnace body (111) and a liquid extraction furnace body (112) connected to the heating furnace body (111). The heating furnace body (111) is provided with the liquid injection nozzle (12) and the combustion nozzle (13). The liquid extraction furnace body (112) has a receiving cavity (102) for liquid extraction.

5. The molten metal holding furnace according to claim 4, characterized in that, A partition wall (103) is formed between the heating furnace body (111) and the liquid extraction furnace body (112). A connecting hole (104) is provided at the bottom of the partition wall (103) so that the molten liquid in the heating chamber (101) can flow into the receiving cavity (102).

6. The molten metal holding furnace according to claim 4, characterized in that, The bottom surface of the furnace chamber of the liquid extraction furnace body (112) is lower than the bottom surface of the furnace chamber of the heating furnace body (111).

7. The molten metal holding furnace according to claim 4, characterized in that, The top of the accommodating cavity (102) is provided with a liquid intake port for scooping out molten liquid, and the bottom of the accommodating cavity (102) is provided with a drain hole and a valve.

8. The molten metal holding furnace according to claim 4, characterized in that, Includes a liquid level monitor (15), installed on the heating furnace body (111) or the liquid extraction furnace body (112), for monitoring the liquid level height of the molten liquid.

9. The molten metal holding furnace according to claim 8, characterized in that, The liquid level monitor (15) is installed at the liquid intake port of the liquid intake furnace body (112). The liquid level monitor (15) includes two guide rods, which are respectively connected to the two poles of the alarm. One of them is long and the other is short, which extends into the accommodating cavity (102) at a preset height through the liquid intake port.

10. The molten metal holding furnace according to claim 1, characterized in that, The system includes an injection port capping structure for capping or opening the injection nozzle (12). The injection port capping structure includes a cap body (41) and a cap body drive. The cap body (41) is hinged to the outside of the injection nozzle (12), and the cap body drive is used to drive the cap body (41) to open or close.

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