Protective gas valve frame of annular furnace and annular furnace

Abstract

The utility model discloses a protective gas valve frame of an annular furnace and the annular furnace, belongs to the technical field of heat treatment equipment, and aims to solve the problem that nitrogen and hydrogen in protective gas supplied to an inner cover cannot be matched at will. The protective gas valve frame of the annular furnace comprises a nitrogen supply pipeline (91), a hydrogen supply pipeline (92), a compressed air supply pipeline (93), a mixer (914), an inner cover protective gas supply pipeline (94) and an inner cover protective gas exhaust pipeline (95). The protective gas valve frame of the annular furnace comprises the mixer, so that not only can nitrogen and hydrogen at each material level of the annular furnace be matched at will, but also continuous supply of protective atmosphere of the oriented silicon steel annular furnace is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment equipment, in particular to a protective gas valve rack of an annular furnace, and also to an annular furnace. Background Art

[0002] Grain-oriented silicon steel is a key material used in the manufacture of motor stators and transformer cores. Its production process is complex and requires high-precision process control. High-temperature annealing ring furnaces are crucial equipment for producing low-iron-loss, high-magnetic-induction grain-oriented silicon steel, determining the magnetic properties and surface quality of the final product. During high-temperature annealing of grain-oriented silicon steel in a ring furnace, in addition to temperature, the protective atmosphere is crucial for ensuring the successful secondary recrystallization of the steel coils within the furnace, forming a superior magnesium silicate base layer, and achieving thorough purification of the steel. A grain-oriented silicon steel ring furnace has dozens of material levels, each corresponding to a set of protective gas valve racks. During production, the valve racks rotate with the furnace floor. While existing technologies enable continuous gas supply to the protective gas valve racks, mixing is not performed at each valve rack. Instead, the gas is mixed and proportioned outside the furnace before being supplied to the valve racks. This means that individual protective gas valve racks cannot independently achieve arbitrary nitrogen and hydrogen ratios during production. This hinders flexible process adjustments and new product development. Furthermore, problems with the mixing station outside the valve racks can easily lead to batch quality issues, resulting in significant economic losses. In addition, the existing technology has only one self-supporting pressure regulating valve on each inner cover discharge pipeline of the protective gas valve rack, which has low production reliability and safety. The pressure regulating valve is a wearing part. Once a failure occurs, it is easy to affect the stable supply of protective gas to the valve rack, thereby affecting the quality and yield of the ring furnace's oriented silicon steel products. Utility Model Content

[0003] In order to solve the problem that nitrogen and hydrogen in the protective gas supplied to the above-mentioned inner cover cannot be arbitrarily mixed, the utility model provides a protective gas valve rack of an annular furnace and an annular furnace. The protective gas valve rack of the annular furnace contains a mixer, which not only can realize the arbitrary mixing of nitrogen and hydrogen at each material level of the annular furnace, but also realize the continuous supply of protective atmosphere of the oriented silicon steel annular furnace.

[0004] The technical solution adopted by the embodiment of the utility model to solve the technical problem is:

[0005] A protective gas valve rack for an annular furnace comprises a nitrogen supply pipeline, a hydrogen supply pipeline, a compressed air supply pipeline, a mixer, an inner cover protective gas supply pipeline and an inner cover protective gas exhaust pipeline. The mixer comprises two inlets and one outlet. The outlet end of the nitrogen supply pipeline is connected to the first inlet of the mixer, the outlet end of the hydrogen supply pipeline is connected to the second inlet of the mixer, the outlet of the mixer is connected to the inlet end of the inner cover protective gas supply pipeline, the outlet end of the inner cover protective gas supply pipeline is connected to the interior of the protective inner cover, and the inlet end of the inner cover protective gas exhaust pipeline is connected to the interior of the protective inner cover.

[0006] Along the direction from the inlet end of the nitrogen supply pipeline to the outlet end of the nitrogen supply pipeline, a first automatic shut-off valve, a first filter, a first flow meter and a first flow regulating valve are sequentially provided on the nitrogen supply pipeline; along the direction from the inlet end of the hydrogen supply pipeline to the outlet end of the hydrogen supply pipeline, a second automatic shut-off valve, a second filter, a second flow meter and a second flow regulating valve are sequentially provided on the hydrogen supply pipeline.

[0007] The first automatic shut-off valve, the first flow regulating valve, the second automatic shut-off valve and the second flow regulating valve are all pneumatic valves, and the compressed air supply pipeline can provide a driving air source to the first automatic shut-off valve, the first flow regulating valve, the second automatic shut-off valve and the second flow regulating valve.

[0008] A first bypass is connected in parallel to the nitrogen supply pipeline, an inlet end of the first bypass is communicated with the inlet end of the nitrogen supply pipeline, and an outlet end of the first bypass is communicated with the outlet end of the nitrogen supply pipeline. A first manual valve and a second manual valve are sequentially provided on the first bypass in a direction from the inlet end of the first bypass to the outlet end of the first bypass. A first connecting branch is connected between the first bypass and the nitrogen supply pipeline, one end of the first connecting branch is located between the first filter and the first flowmeter, and the other end of the first connecting branch is located between the first manual valve and the second manual valve.

[0009] A second bypass is connected in parallel to the hydrogen supply pipeline, the inlet end of the second bypass is connected to the inlet end of the hydrogen supply pipeline, and the outlet end of the second bypass is connected to the outlet end of the hydrogen supply pipeline. A third manual valve and a fourth manual valve are sequentially provided on the second bypass in a direction from the inlet end of the second bypass to the outlet end of the second bypass. A second connecting branch is connected between the second bypass and the hydrogen supply pipeline, one end of the second connecting branch is located between the second filter and the second flowmeter, and the other end of the second connecting branch is located between the third manual valve and the fourth manual valve.

[0010] The protective gas valve rack of the annular furnace includes two parallel inner cover protective gas supply pipelines, the outlet ends of the two inner cover protective gas supply pipelines are connected to the interiors of two protective inner covers located at one material level in a one-to-one correspondence, and a third flow meter is provided on the inner cover protective gas supply pipeline.

[0011] The protective gas valve rack of the annular furnace includes two parallel inner cover protective gas exhaust pipelines, and the inlet ends of the two inner cover protective gas exhaust pipelines are connected one-to-one with the interiors of two protective inner covers located at one material level. The protective gas valve rack of the annular furnace also includes a protective gas return pipeline and a three-way relief valve. The inlet ends of the two inner cover protective gas exhaust pipelines are both connected with the inlet of the three-way relief valve, and the outlet of the three-way relief valve is connected with the inlet end of the protective gas return pipeline, and the outlet end of the protective gas return pipeline is connected with the furnace. The three-way relief valve is a pneumatic valve, and the compressed air supply pipeline can provide a driving gas source to the three-way relief valve.

[0012] Along the direction from the inlet end of the inner cover protective gas exhaust pipeline to the outlet end of the inner cover protective gas exhaust pipeline, the inner cover protective gas exhaust pipeline contains a discharge main pipeline and three parallel discharge branch pipelines connected in sequence, and a pressure detector is provided on the discharge main pipeline. The three parallel discharge branch pipelines are respectively the first branch pipeline, the second branch pipeline and the third branch pipeline. The structure of the first branch pipeline is the same as that of the second branch pipeline. Along the direction from the inlet end of the first branch pipeline to the outlet end of the first branch pipeline, the first branch pipeline is provided with a third filter and a self-supporting pressure regulating valve in sequence, and the third branch pipeline is provided with a fifth manual valve.

[0013] The protective gas valve rack of the annular furnace is divided into two parts, and the two parts are arranged along the circumference of the annular furnace. The two parts supply gas to the two protective inner covers at a material level in the annular furnace. The inner cover protective gas exhaust pipeline is located in the bottom two layers of pipelines, the nitrogen supply pipeline and the hydrogen supply pipeline are located in the middle two layers of pipelines, and the mixer and the inner cover protective gas supply pipeline are located in the top two layers of pipelines. A centralized wiring explosion-proof terminal adapter box is arranged above each of the two parts.

[0014] An annular furnace comprises a furnace body, an annular header and the above-mentioned protective gas valve rack, the furnace body comprising a rotating furnace bottom, a fixed furnace body and a furnace chamber, the annular header and the rotating furnace bottom are connected and fixed, the annular header comprises a nitrogen conveying ring pipe, a hydrogen conveying ring pipe and a compressed air conveying ring pipe, the inlet end of the nitrogen supply pipeline is connected to the nitrogen conveying ring pipe, the inlet end of the hydrogen supply pipeline is connected to the hydrogen conveying ring pipe, and the inlet end of the compressed air supply pipeline is connected to the compressed air conveying ring pipe, and the protective gas valve rack of the annular furnace corresponds one-to-one to the material level of the annular furnace.

[0015] The beneficial effects of the embodiments of the present utility model are:

[0016] 1. The nitrogen and hydrogen in the shielding gas supplied by the shielding gas valve rack can be mixed in any ratio, which not only facilitates the flexible adjustment of the production process but also shortens the development cycle of high-grade oriented silicon steel products. Its safe and reliable gas supply method ensures the continuous stability of the quality of oriented silicon steel products, reduces the defective product rate, and prevents major product quality accidents caused by shielding gas supply failures.

[0017] 2. The valve frame has a compact structure, reasonable layout, stable operation, safety and reliability, which provides a strong guarantee for the production of high magnetic steel and low iron loss oriented silicon steel in the ring furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0019] Figure 1 This is a schematic diagram of the connection of components of the protective gas valve rack of the annular furnace described in the present invention.

[0020] Figure 2 It is a schematic diagram of the inner cover protective gas exhaust pipeline.

[0021] Figure 3 is a schematic diagram of a mixer.

[0022] Figure 4 It is a schematic structural diagram of the protective gas valve rack of the annular furnace described in the present invention.

[0023] Figure 5 It is a schematic diagram of the annular furnace described in the present invention.

[0024] The following are the descriptions of the reference numerals:

[0025] 1. Fixed nitrogen, hydrogen, and compressed air pipelines; 2. Mobile nitrogen, hydrogen, and compressed air pipelines; 3. Fixed male connector; 4. Rotating swing arm; 5. Rotating trolley; 6. Mobile male connector; 7. Rotating female connector; 8. Ring header; 9. Shielding gas valve rack; 10. Furnace body;

[0026] 81. Nitrogen gas delivery loop pipe; 82. Hydrogen gas delivery loop pipe; 83. Compressed air delivery loop pipe;

[0027] 91. Nitrogen supply pipeline; 92. Hydrogen supply pipeline; 93. Compressed air supply pipeline; 94. Inner cover protection gas supply pipeline; 95. Inner cover protection gas exhaust pipeline; 96. First automatic shut-off valve; 97. First filter; 98. First flow meter; 99. First flow regulating valve; 910. Second automatic shut-off valve; 911. Second filter; 912. Second flow meter; 913. Second flow regulating valve; 914. Mixer; 915. Third flow meter; 916. Pressure detector; 917. Third filter; 918. Self-supporting pressure regulating valve; 919. Three-way relief valve; 920. Shielding gas return pipeline; 921, first bypass; 922, first manual valve; 923, second manual valve; 924, first connecting branch; 925, second bypass; 926, third manual valve; 927, fourth manual valve; 928, second connecting branch; 929, main discharge pipeline; 930, branch discharge pipeline; 931, first branch pipeline; 932, second branch pipeline; 933, third branch pipeline; 934, fifth manual valve; 935, centralized wiring explosion-proof terminal adapter box; 936, venting pipeline layer; 937, nitrogen and hydrogen supply pipeline layer; 938, shielding gas supply pipeline layer inside the hood;

[0028] 101. Rotating furnace bottom; 102. Fixed furnace body; 103. Furnace chamber; 104. Protective inner cover. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] like Figures 1 to 3 As shown, a protective gas valve rack of a ring furnace described in an embodiment of the present invention includes a nitrogen supply pipeline 91, a hydrogen supply pipeline 92, a compressed air supply pipeline 93, a mixer 914, an inner cover protective gas supply pipeline 94 and an inner cover protective gas exhaust pipeline 95. The mixer 914 is a three-way structure. The mixer 914 has two inlets and one outlet. The outlet end of the nitrogen supply pipeline 91 is connected to the first inlet of the mixer 914, the outlet end of the hydrogen supply pipeline 92 is connected to the second inlet of the mixer 914, the outlet of the mixer 914 is connected to the inlet end of the inner cover protective gas supply pipeline 94, the outlet end of the inner cover protective gas supply pipeline 94 is connected to the interior of the protective inner cover 104, and the inlet end of the inner cover protective gas exhaust pipeline 95 is connected to the interior of the protective inner cover 104.

[0031] Along the direction from the inlet end of the nitrogen supply pipeline 91 to the outlet end of the nitrogen supply pipeline 91, a first automatic shut-off valve 96, a first filter 97, a first flowmeter 98 and a first flow regulating valve 99 are sequentially provided on the nitrogen supply pipeline 91; along the direction from the inlet end of the hydrogen supply pipeline 92 to the outlet end of the hydrogen supply pipeline 92, a second automatic shut-off valve 910, a second filter 911, a second flowmeter 912 and a second flow regulating valve 913 are sequentially provided on the hydrogen supply pipeline 92.

[0032] like Figure 1 As shown, nitrogen supply line 91 and hydrogen supply line 92 primarily provide process gases to protective inner hood 104 in the annular furnace, which houses the steel coils awaiting heat treatment. Compressed air supply line 93 primarily provides actuating air for all pneumatic valves on the valve rack. The first automatic shut-off valve 96, first flow regulating valve 99, second automatic shut-off valve 910, and second flow regulating valve 913 are all pneumatic valves, and compressed air supply line 93 provides actuating air for these valves.

[0033] A first bypass 921 is connected in parallel to the nitrogen supply pipeline 91. The inlet end of the first bypass 921 is connected to the inlet end of the nitrogen supply pipeline 91, and the outlet end of the first bypass 921 is connected to the outlet end of the nitrogen supply pipeline 91. A first manual valve 922 and a second manual valve 923 are sequentially provided on the first bypass 921 in the direction from the inlet end of the first bypass 921 to the outlet end of the first bypass 921. A first connecting branch 924 is connected between the first bypass 921 and the nitrogen supply pipeline 91. One end of the first connecting branch 924 is connected between the first filter 97 and the first flowmeter 98, and the other end of the first connecting branch 924 is connected between the first manual valve 922 and the second manual valve 923.

[0034] A second bypass 925 is connected in parallel to the hydrogen supply pipeline 92, and the inlet end of the second bypass 925 is connected to the inlet end of the hydrogen supply pipeline 92, and the outlet end of the second bypass 925 is connected to the outlet end of the hydrogen supply pipeline 92. Along the direction from the inlet end of the second bypass 925 to the outlet end of the second bypass 925, a third manual valve 926 and a fourth manual valve 927 are sequentially provided on the second bypass 925, and a second connecting branch 928 is connected between the second bypass 925 and the hydrogen supply pipeline 92, one end of the second connecting branch 928 is connected between the second filter 911 and the second flowmeter 912, and the other end of the second connecting branch 928 is connected between the third manual valve 926 and the fourth manual valve 927.

[0035] The protective gas valve rack of the annular furnace includes two parallel inner cover protective gas supply pipelines 94, the inlet ends of the two inner cover protective gas supply pipelines 94 are connected to the outlet of the mixer 914, and the outlet ends of the two inner cover protective gas supply pipelines 94 are connected to the interior of the two protective inner covers 104 located at one material level in a one-to-one correspondence. The two protective inner covers 104 at one material level are arranged at intervals along the radial direction of the annular furnace, and a third flowmeter 915 is provided on the inner cover protective gas supply pipeline 94.

[0036] like Figures 1 to 2 As shown, the protective gas valve rack of the annular furnace includes two parallel inner cover protective gas exhaust pipelines 95, and the inlet ends of the two inner cover protective gas exhaust pipelines 95 are connected one-to-one with the interiors of the two protective inner covers 104 located at one material level. The protective gas valve rack of the annular furnace also includes a protective gas return pipeline 920 and a three-way relief valve 919. The three-way relief valve 919 is a three-way structure. The three-way relief valve 919 contains an inlet, an outlet and a relief port. The inlet ends of the two inner cover protective gas exhaust pipelines 95 are both connected to the inlet of the three-way relief valve 919, and the outlet of the three-way relief valve 919 is connected to the inlet end of the protective gas return pipeline 920. The outlet end of the protective gas return pipeline 920 is connected to the furnace 103. The three-way relief valve 919 is a pneumatic valve, and the compressed air supply pipeline 93 can provide a driving gas source to the three-way relief valve 919.

[0037] Along the direction from the inlet end of the inner cover protective gas exhaust pipeline 95 to the outlet end of the inner cover protective gas exhaust pipeline 95, the inner cover protective gas exhaust pipeline 95 contains a discharge main pipeline 929 and three parallel discharge branch pipelines 930 connected in sequence, and a pressure detector 916 is provided on the discharge main pipeline 929. The three parallel discharge branch pipelines 930 are respectively a first branch pipeline 931, a second branch pipeline 932 and a third branch pipeline 933. The structure of the first branch pipeline 931 is the same as that of the second branch pipeline 932. Along the direction from the inlet end of the first branch pipeline 931 to the outlet end of the first branch pipeline 931, a third filter 917 and a self-supporting pressure regulating valve 918 are provided in sequence on the first branch pipeline 931, and a fifth manual valve 934 is provided on the third branch pipeline 933.

[0038] like Figure 4As shown, the annular furnace's protective gas valve rack is divided into two sections, arranged circumferentially along the annular furnace. The two sections correspond one to one to supply gas to two protective inner covers 104 at a material level within the annular furnace. The inner cover protective gas exhaust line 95 is located in the bottom two pipeline layers, which are the emission pipeline layer 936. The nitrogen supply line 91 and the hydrogen supply line 92 are located in the middle two pipeline layers, which are the nitrogen and hydrogen supply pipeline layer 937. The mixer 914 and the inner cover protective gas supply line 94 are located in the top two pipeline layers, which are the inner cover protective gas supply pipeline layer 938. A centralized wiring explosion-proof terminal adapter box 935 is located above each of the two sections. The entire valve rack has a relatively compact layout, designed for ease of operation and maintenance.

[0039] The following describes a ring furnace, such as Figures 1 to 5 As shown, the annular furnace includes a furnace body 10, an annular manifold 8 and the above-mentioned protective gas valve rack 9. The furnace body 10 includes a rotating furnace bottom 101, a fixed furnace body 102 and a furnace 103. The furnace 103 includes multiple material levels, and the multiple material levels are arranged at intervals along the circumference of the furnace body 10. Each material level is provided with two protective inner covers 104, and the two protective inner covers 104 are arranged at intervals along the radial direction of the furnace body 10. The annular manifold 8 is connected and fixed to the rotating furnace bottom 101. The annular manifold 8 includes a nitrogen delivery ring pipe 81, a hydrogen delivery ring pipe 82 and a compressed air delivery ring pipe 83. The nitrogen The conveying ring pipe 81, the hydrogen conveying ring pipe 82, the compressed air conveying ring pipe 83 and the furnace body 10 are in a concentric circle relationship. The inlet end of the nitrogen supply pipeline 91 is connected to the nitrogen conveying ring pipe 81, the inlet end of the hydrogen supply pipeline 92 is connected to the hydrogen conveying ring pipe 82, and the inlet end of the compressed air supply pipeline 93 is connected to the compressed air conveying ring pipe 83. The protective gas valve rack 9 of the annular furnace corresponds one-to-one to the material level of the annular furnace. The outlet end of the inner cover protective gas supply pipeline 94 and the inlet end of the inner cover protective gas exhaust pipeline 95 are both connected to the rotary furnace bottom 101.

[0040] The annular furnace also includes fixed nitrogen, hydrogen, and compressed air pipelines 1; mobile nitrogen, hydrogen, and compressed air pipelines 2; a fixed male connector 3; a rotating swing arm 4; a slewing trolley 5; a mobile male connector 6; a rotating female connector 7; and nitrogen, hydrogen, and compressed air. The nitrogen, hydrogen, and compressed air from connection point A are divided into two routes and supplied to the protective gas valve rack 9. One route flows from fixed nitrogen, hydrogen, and compressed air pipelines 1 to fixed male connector 3 to annular manifold 8 to protective gas valve rack 9; the other route flows from mobile nitrogen, hydrogen, and compressed air pipelines 2 to rotating swing arm 4 to mobile male connector 6 to annular manifold 8 to protective gas valve rack 9. A slewing trolley 5 is located at the end of the rotating swing arm 4, which can drive the mobile male connector 6 to rotate 36 degrees around the center point O of the annular furnace.

[0041] The nitrogen pipeline in the fixed nitrogen, hydrogen, and compressed air pipeline 1 and the mobile nitrogen, hydrogen, and compressed air pipeline 2 can supply nitrogen to the nitrogen delivery loop 81, the hydrogen pipeline in the fixed nitrogen, hydrogen, and compressed air pipeline 1 and the mobile nitrogen, hydrogen, and compressed air pipeline 2 can supply hydrogen to the hydrogen delivery loop 82, and the compressed air pipeline in the fixed nitrogen, hydrogen, and compressed air pipeline 1 and the mobile nitrogen, hydrogen, and compressed air pipeline 2 can supply compressed air to the compressed air delivery loop 83. The annular manifold 8 and the protective gas valve rack 9 are both fixedly connected to the rotary furnace bottom 101. The annular manifold 8 and the protective gas valve rack 9 are both stationary relative to the rotary furnace bottom 101 and rotate synchronously with the rotation of the rotary furnace bottom 101.

[0042] Ten sets of rotating female connectors 7 are evenly distributed along the annular manifold 8 circumferentially around the annular furnace. Each set of rotating female connectors uses an aviation connector plug-in method to connect and disconnect airflow to the fixed male connector 3 and the movable male connector 6. The main principle for achieving continuous air supply to the annular furnace's protective gas valve rack is as follows: When the furnace is first opened, the rotary trolley 5 is at the starting position S. The movable male connector 6 connects to one of the rotated rotating female connectors 7, while the fixed male connector 3 is disconnected. The movable male connector 6 then supplies air to the protective gas valve rack 9. As the annular furnace rotates, it also drives the rotating swing arm 4 until it reaches its final position F. During this process, the movable male connector 6 continuously supplies air. After reaching the end position F, the rotating furnace bottom 101 of the annular furnace stops rotating, the mobile male connector 6 continues to supply gas, and the fixed male connector 3 connects and supplies gas with a corresponding set of rotating female connectors 7. After confirming that the fixed male connector 3 has successfully supplied gas, the mobile male connector 6 is disconnected from the rotating female connector 7 it is connected to, and then it returns to the starting position S point under the drive of the rotating trolley 5, and reconnects with the next set of rotating female connectors 7 that have rotated into place. After the mobile male connector 6 successfully supplies gas again, the fixed male connector 3 is disconnected from the rotating female connector 7 it is connected to and stops supplying gas, and the annular furnace can continue to rotate. In this way, by switching back and forth between the fixed male connector 3 and the mobile male connector 6, a continuous gas supply to the protective gas valve rack 9 that rotates with the annular furnace is achieved.

[0043] Each protective gas valve rack 9 can provide a nitrogen-hydrogen protective atmosphere of any proportion to its corresponding annular furnace material level according to the production process requirements. Its main operating principle is as follows: When the process setting requires the introduction of pure hydrogen at this material level, the first automatic shut-off valve 96 and the first flow regulating valve 99 on the nitrogen supply line 91 are closed, the second automatic shut-off valve 910 on the hydrogen supply line 92 is opened, and the second flow regulating valve 913 is gradually opened, forming a cascade control loop with the second flowmeter 912 to control the hydrogen flow rate to the value required by the process. The operating principle when introducing pure nitrogen is the same as when introducing pure hydrogen. At this time, the second automatic shut-off valve 910 and the second flow regulating valve 913 on the hydrogen line are closed, and the first automatic shut-off valve 96 and the first flow regulating valve 99 on the nitrogen line are opened and operated. When a nitrogen-hydrogen mixture (NHx) of a specified ratio is required, the shutoff valves and regulating valves on the nitrogen supply line 91 and hydrogen supply line 92 are opened. The regulating valves on each line adjust the flow rate to a value that meets the process ratio. The hydrogen and nitrogen are then thoroughly mixed in the mixer 914 and supplied to the protective inner cover 104 of the annular furnace. Each protective gas valve carrier 9 rotates one full revolution with the annular furnace, representing a production cycle. During this cycle, the protective gas valve carrier 9 passes through different process control zones of the annular furnace, requiring the supply of different types and flow rates of protective gas. To maintain the pressure within the inner cover of the annular furnace within a relatively stable normal range, the self-supporting pressure regulating valve 918 on the inner cover protective gas exhaust line 95 automatically adjusts according to changes in the protective gas exhaust volume. The adjustment results are monitored by a remote pressure detector 916 installed on the vent pipe. Each self-supporting pressure regulating valve 918 on the inner cover vent line utilizes a one-in-use, one-in-standby design, maximizing safety during the production of grain-oriented silicon steel in the annular furnace and ensuring consistent and stable product quality. After passing through the self-supporting pressure regulating valve 918, the shielding gas is automatically released selectively into or out of the furnace through the three-way vent valve 919, depending on the furnace temperature and control zone at the corresponding material level, ensuring safe production in the annular furnace.

[0044] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features, technical features, technical solutions, technical solutions, and embodiments of the present invention may be freely combined.

Claims

1. A protective gas valve rack for an annular furnace, characterized in that: The protective gas valve rack of the annular furnace comprises a nitrogen supply pipeline (91), a hydrogen supply pipeline (92), a compressed air supply pipeline (93), a mixer (914), an inner cover protective gas supply pipeline (94) and an inner cover protective gas exhaust pipeline (95). The mixer (914) comprises two inlets and one outlet. The outlet end of the nitrogen supply pipeline (91) is connected to the first inlet of the mixer (914), the outlet end of the hydrogen supply pipeline (92) is connected to the second inlet of the mixer (914), the outlet of the mixer (914) is communicated with the inlet end of the inner cover protective gas supply pipeline (94), the outlet end of the inner cover protective gas supply pipeline (94) is communicated with the interior of the protective inner cover (104), and the inlet end of the inner cover protective gas exhaust pipeline (95) is communicated with the interior of the protective inner cover (104).

2. The protective gas valve support of the annular furnace according to claim 1, characterized in that: A first automatic shutoff valve (96), a first filter (97), a first flow meter (98), and a first flow regulating valve (99) are sequentially provided on the nitrogen supply pipeline (91) along a direction from the inlet end of the nitrogen supply pipeline (91) to the outlet end of the nitrogen supply pipeline (91); and a second automatic shutoff valve (910), a second filter (911), a second flow meter (912), and a second flow regulating valve (913) are sequentially provided on the hydrogen supply pipeline (92) along a direction from the inlet end of the hydrogen supply pipeline (92) to the outlet end of the hydrogen supply pipeline (92).

3. The protective gas valve support of the annular furnace according to claim 2, characterized in that: The first automatic shut-off valve (96), the first flow regulating valve (99), the second automatic shut-off valve (910) and the second flow regulating valve (913) are all pneumatic valves, and the compressed air supply pipeline (93) can provide a driving air source to the first automatic shut-off valve (96), the first flow regulating valve (99), the second automatic shut-off valve (910) and the second flow regulating valve (913).

4. The protective gas valve support of the annular furnace according to claim 2, characterized in that: A first bypass (921) is connected in parallel to the nitrogen supply pipeline (91). The inlet end of the first bypass (921) is communicated with the inlet end of the nitrogen supply pipeline (91), and the outlet end of the first bypass (921) is communicated with the outlet end of the nitrogen supply pipeline (91). A first manual valve (922) and a second manual valve (923) are sequentially provided on the first bypass (921) in a direction from the inlet end of the first bypass (921) to the outlet end of the first bypass (921). A first connecting branch (924) is connected between the first bypass (921) and the nitrogen supply pipeline (91). One end of the first connecting branch (924) is located between the first filter (97) and the first flowmeter (98), and the other end of the first connecting branch (924) is located between the first manual valve (922) and the second manual valve (923).

5. The protective gas valve support of the annular furnace according to claim 2, characterized in that: A second bypass (925) is connected in parallel to the hydrogen supply pipeline (92). The inlet end of the second bypass (925) is communicated with the inlet end of the hydrogen supply pipeline (92), and the outlet end of the second bypass (925) is communicated with the outlet end of the hydrogen supply pipeline (92). A third manual valve (926) and a fourth manual valve (927) are sequentially provided on the second bypass (925) in a direction from the inlet end of the second bypass (925) to the outlet end of the second bypass (925). A second connecting branch (928) is connected between the second bypass (925) and the hydrogen supply pipeline (92). One end of the second connecting branch (928) is located between the second filter (911) and the second flowmeter (912), and the other end of the second connecting branch (928) is located between the third manual valve (926) and the fourth manual valve (927).

6. The protective gas valve support of the annular furnace according to claim 5, characterized in that: The protective gas valve rack of the annular furnace includes two parallel inner cover protective gas supply pipelines (94), the outlet ends of the two inner cover protective gas supply pipelines (94) are connected to the interiors of two protective inner covers (104) located at one material level in a one-to-one correspondence, and a third flow meter (915) is provided on the inner cover protective gas supply pipeline (94).

7. The protective gas valve support of the annular furnace according to claim 1, characterized in that: The protective gas valve frame of the annular furnace includes two parallel inner cover protective gas discharge pipelines (95), the inlet ends of the two inner cover protective gas discharge pipelines (95) are connected to the interior of two protective inner covers (104) located at the same material level in a one-to-one correspondence, and the protective gas valve frame of the annular furnace also includes a protective gas return pipeline (920) and a three-way relief valve (919), the inlet ends of the two inner cover protective gas discharge pipelines (95) are both connected to the inlet of the three-way relief valve (919), the outlet of the three-way relief valve (919) is connected to the inlet end of the protective gas return pipeline (920), and the outlet end of the protective gas return pipeline (920) is connected to the furnace (103), the three-way relief valve (919) is a pneumatic valve, and the compressed air supply pipeline (93) can provide a driving gas source to the three-way relief valve (919).

8. The protective gas valve support of the annular furnace according to claim 1, characterized in that: The inner cover protection gas exhaust pipeline (95) includes a discharge main pipeline (929) and three parallel discharge branch pipelines (930) connected in sequence along the direction from the inlet end of the inner cover protection gas exhaust pipeline (95) to the outlet end of the inner cover protection gas exhaust pipeline (95). The discharge main pipeline (929) is provided with a pressure detector (916). The three parallel discharge branch pipelines (930) are respectively a first branch pipeline (931), a second branch pipeline (932) and a third branch pipeline (933). The structure of the first branch pipeline (931) is the same as that of the second branch pipeline (932). Along the direction from the inlet end of the first branch pipeline (931) to the outlet end of the first branch pipeline (931), a third filter (917) and a self-supporting pressure regulating valve (918) are sequentially provided on the first branch pipeline (931), and a fifth manual valve (934) is provided on the third branch pipeline (933).

9. The protective gas valve support of the annular furnace according to claim 1, characterized in that: The protective gas valve rack of the annular furnace is divided into two parts, which are arranged along the circumference of the annular furnace. The two parts supply gas to two protective inner covers (104) at a material level in the annular furnace. The inner cover protective gas discharge pipeline (95) is located in the bottom two layers of pipelines, the nitrogen supply pipeline (91) and the hydrogen supply pipeline (92) are located in the middle two layers of pipelines, and the mixer (914) and the inner cover protective gas supply pipeline (94) are located in the top two layers of pipelines. A centralized wiring explosion-proof terminal adapter box (935) is arranged above each of the two parts.

10. A ring furnace, characterized in that: The annular furnace comprises a furnace body (10), an annular manifold (8) and the protective gas valve rack (9) according to claim 1, the furnace body (10) comprises a rotating furnace bottom (101), a fixed furnace body (102) and a furnace chamber (103), the annular manifold (8) and the rotating furnace bottom (101) are connected and fixed, the annular manifold (8) comprises a nitrogen conveying ring pipe (81), a hydrogen conveying ring pipe (82) and a compressed air conveying ring pipe (83), the inlet end of the nitrogen supply pipeline (91) is connected to the nitrogen conveying ring pipe (81), the inlet end of the hydrogen supply pipeline (92) is connected to the hydrogen conveying ring pipe (82), the inlet end of the compressed air supply pipeline (93) is connected to the compressed air conveying ring pipe (83), and the protective gas valve rack (9) of the annular furnace corresponds one-to-one to the material level of the annular furnace.

Images