Disc type vertical once-through steam generator

Abstract

The invention discloses a disc type vertical once-through steam generator, and relates to the technical field of steam generators, the disc type vertical once-through steam generator comprises a main body, the upper side of the main body is fixedly connected with a burner, the lower side of the main body is fixedly connected with a bottom box I, and the lower side of the bottom box I is fixedly connected with a bottom box II; a water inlet pipe and a first flowing pipe are fixedly connected to the right side of the second bottom box, a smoke outlet pipe is fixedly connected to the lower side of the second bottom box, a steam discharging pipe is fixedly connected to the left side of the main body, a flange plate is arranged at the left end of the steam discharging pipe, and an external connecting pipe is arranged on the left side of the flange plate. According to the disc type vertical once-through steam generator, by arranging the main body, the water inlet pipe, the steam discharge pipe, the external connecting pipe, the heat insulation covers, the side plates, the two-way screw rods and the connecting blocks, after the external connecting pipe is connected with the steam discharge pipe, the heat insulation covers on the two sides are conveniently controlled to shield the flange plate, and the heat insulation covers are sealed through the arc-shaped air bags and the air boxes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam generator, in particular to a disc type vertical once-through steam generator. BACKGROUND

[0002] The steam generator is a device for converting water into steam by heating, which is widely used in industry, power generation, heating and other fields.

[0003] In the use of the once-through steam generator, water is introduced into the generator and heated by the combustion machine to generate steam. The generated steam is discharged through the discharge port. The external pipeline is connected to the discharge port through the flange plate during discharge, which facilitates the utilization of steam. Since the temperature of the discharged steam is high, the temperature is above 100℃ (saturated steam), and even up to 200-300℃ (superheated steam), under high temperature and high pressure, the flange gasket (such as graphite, metal winding gasket) is easy to harden and crack, which makes the steam easy to leak out, and there is a safety hazard. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a disc type vertical once-through steam generator, which solves the problem of easy leakage of discharged steam and safety hazard.

[0005] To achieve the above purpose, the present application realizes the following technical scheme:

[0006] A disc type vertical once-through steam generator, comprising a main body, a combustion machine fixedly connected to the upper side of the main body, a bottom box one fixedly connected to the lower side of the main body, a bottom box two fixedly connected to the lower side of the bottom box one, a water inlet pipe and a flow pipe one fixedly connected to the right side of the bottom box two, a smoke outlet pipe fixedly connected to the lower side of the bottom box two, a steam discharge pipe fixedly connected to the left side of the main body, a flange plate provided at the left end of the steam discharge pipe, an external connecting pipe provided at the left side of the flange plate, a protection unit provided at the left side of the main body, the protection unit comprising a side plate fixedly connected to the left side of the main body, a lifting groove opened at the outer side of the side plate, two symmetrically distributed connecting blocks slidingly connected to the inner side of the lifting groove, and a sealing assembly provided at the front side of the connecting block, the sealing assembly being used for blocking the leaked steam.

[0007] Preferably, a condenser is provided at the inner side of the bottom box two, an energy saver is fixedly connected to the inner side of the bottom box one, a flow pipe two and a flow pipe three are fixedly connected to the right side of the bottom box one, a conveying pipe one is fixedly connected between the flow pipe two and the flow pipe one, a back combustion chamber is fixedly connected to the inner side of the main body, a combustion chamber is fixedly connected to the inner side of the main body and located at the upper side of the back combustion chamber, a conveying pipe two is fixedly connected between the flow pipe three and the back combustion chamber, the combustion chamber is fixedly connected with the steam discharge pipe, and the combustion chamber and the back combustion chamber are communicated.

[0008] Preferably, the sealing assembly comprises a heat shield fixedly connected to the front side of the two connecting blocks, the inner side of the lifting groove is rotationally connected with a bidirectional screw rod, the two ends of the bidirectional screw rod are provided with opposite threads, and the two ends of the bidirectional screw rod are threadedly connected with the two connecting blocks respectively.

[0009] Preferably, the rear side of the side plate is provided with a reinforcing assembly, the reinforcing assembly comprises an air tank fixedly connected to the rear side of the side plate, the inner side of the air tank is provided with two piston plates, the piston plates are fixedly connected with L-shaped plates between the connecting blocks, the middle part of the rear side of the air tank is fixedly connected with a concentrating pipe, two arc-shaped holes are formed in the side of the heat shield close to the steam discharge pipe, the inner sides of the two arc-shaped holes are fixedly connected with arc-shaped air bags, and the arc-shaped air bags are fixedly connected with a U-shaped pipe between the two arc-shaped air bags.

[0010] Preferably, the inner side of the heat shield is fixedly connected with a guide plate, the inner side of the guide plate is slidably connected with two guide blocks, the side of the guide block close to the flange plate is fixedly connected with a moving block, the outer sides of the two moving blocks are rotationally connected with inclined plates, the lower end of the inclined plate is rotationally connected with a lifting block, the outer side of the lifting block is fixedly connected with a sealing arc-shaped plate, and the sealing arc-shaped plate and the guide plate are fixedly connected with an extension rod two.

[0011] Preferably, the outer sides of the two guide blocks are rotationally connected with inclined plates two, the outer side of the inclined plate two is rotationally connected with a pressing plate, the pressing plate and the heat shield are fixedly connected with an extension rod one and a spring, the inner side of the heat shield is fixedly connected with a connecting plate, the outer side of the connecting plate is fixedly connected with a fixing frame, and the inner side of the fixing frame is fixedly connected with a squeezing air bag.

[0012] Preferably, the squeezing air bag is located on the side of the pressing plate close to the sealing arc-shaped plate, the other side of the pressing plate is fixedly connected with a fixing rod, one end of the fixing rod close to the guide plate is fixedly connected with an electromagnet, and the inner side of the heat shield is fixedly connected with a steam sensor.

[0013] Advantages

[0014] The application provides a disc type vertical direct current steam generator.

[0015] (1) The disc type vertical direct current steam generator is provided with a main body, a water inlet pipe, a steam discharge pipe, an external connecting pipe, a heat shield, a side plate, a bidirectional screw rod and connecting blocks, the external connecting pipe is connected with the steam discharge pipe, the heat shields on both sides are used for shielding the flange plate, and the heat shield is sealed by arc-shaped air bags and an air tank.

[0016] (2) The disc-type vertical direct current steam generator is provided with a heat insulation cover, a guide plate, a guide block, an inclined plate, a lifting block, a sealing arc plate and an air bag. When steam leaks, the sealing arc plates on the upper and lower sides are in contact with the flange, which facilitates the sealing operation of the flange connection and reduces the amount of steam leakage.

[0017] (3) The disc-type vertical direct current steam generator is provided with a condenser, an economizer, a backfire chamber and a combustion chamber, which facilitates gradual heating when steam is generated and fully utilizes the heat of the flue gas generated by the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the inner side of the present invention;

[0020] Figure 3 3D diagram of the protective unit of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the protection unit in the present invention from another perspective;

[0022] Figure 5 is a three-dimensional structural diagram of the sealing assembly in the present invention;

[0023] Figure 6 It is a cross-sectional three-dimensional structural diagram of the heat insulation cover in the present invention;

[0024] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0025] Figure 8 It is a partial three-dimensional structural diagram of the sealing component in the present invention.

[0026] In the figure: 1, main body; 2, combustion machine; 3, smoke outlet pipe; 4, water inlet pipe; 5, flow pipe one; 6, steam discharge pipe; 7, external connecting pipe; 8, protection unit; 9, flow pipe two; 10, conveying pipe one; 11, flow pipe three; 12, conveying pipe two; 13, bottom box one; 14, bottom box two; 15, condenser; 16, energy saver; 17, back combustion chamber; 18, combustion chamber; 19, flange; 81, side plate; 82, motor; 83, lifting groove; 84, connecting block; 85, sealing assembly; 86, reinforcing assembly; 87, bidirectional screw rod; 88, steam sensor; 851, heat shield; 852, guide plate; 853, guide block; 854, moving block; 855, inclined plate one; 856, lifting block; 857, sealing arc plate; 858, inclined plate two; 859, pressing plate; 8510, telescopic rod one; 8511, spring; 8512, fixed rod; 8513, electromagnet; 8514, connecting plate; 8515, fixing frame; 8516, extrusion air bag; 8517, telescopic rod two; 861, air tank; 862, piston plate; 863, concentrating pipe; 864, fixed pipe; 865, L-shaped plate; 868, U-shaped pipe; 869, arc-shaped hole; 8610, arc-shaped air bag. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0028] The present application provides the following technical solutions:

[0029] Embodiment one

[0030] Please refer to Figures 1-5 A disc type vertical direct current steam generator, comprising a main body 1, the upper side of the main body 1 is fixedly connected with a combustion machine 2, the lower side of the main body 1 is fixedly connected with a bottom box one 13, the lower side of the bottom box one 13 is fixedly connected with a bottom box two 14, the right side of the bottom box two 14 is fixedly connected with a water inlet pipe 4 and a flow pipe one 5, the lower side of the bottom box two 14 is fixedly connected with a smoke outlet pipe 3, the left side of the main body 1 is fixedly connected with a steam discharge pipe 6, the left end of the steam discharge pipe 6 is provided with a flange 19, the left side of the flange 19 is provided with an external connecting pipe 7, the left side of the main body 1 is provided with a protection unit 8, the protection unit 8 comprises a side plate 81, the side plate 81 is fixedly connected to the left side of the main body 1, the outer side of the side plate 81 is provided with a lifting groove 83, the inner side of the lifting groove 83 is slidably connected with two symmetrically distributed connecting blocks 84, the front side of the connecting block 84 is provided with a sealing assembly 85, and the sealing assembly 85 is used for blocking the leaked steam.

[0031] The inner side of the bottom box two 14 is provided with a condenser 15, the inner side of the bottom box one 13 is fixedly connected with an energy saver 16, the right side of the bottom box one 13 is fixedly connected with a flow pipe two 9 and a flow pipe three 11, the flow pipe two 9 and the flow pipe one 5 are fixedly connected with a conveying pipe one 10, the inner side of the main body 1 is fixedly connected with a back combustion chamber 17, the inner side of the main body 1 and located on the upper side of the back combustion chamber 17 is fixedly connected with a combustion chamber 18, the flow pipe three 11 and the back combustion chamber 17 are fixedly connected with a conveying pipe two 12, the combustion chamber 18 and the steam exhaust pipe 6 are fixedly connected, the combustion chamber 18 and the back combustion chamber 17 are communicated, when steam is needed, cold water is first introduced into the bottom box two 14 through the water inlet pipe 4, because the water inlet pipe 4, the flow pipe one 5 and the condenser 15 are connected, the water enters the condenser 15, the water is introduced into the flow pipe two 9 through the conveying pipe one 10, because the flow pipe two 9 and the flow pipe three 11 are connected with the energy saver 16, the water flows through the energy saver 16, and then the water is conveyed into the back combustion chamber 17 through the conveying pipe two 12, the back combustion chamber 17 and the combustion chamber 18 are both disc-shaped pipe structures, the water passes through the combustion chamber 18, and the combustion engine 2 generates high-temperature flue gas, which first preliminarily heats the water in the combustion chamber 18, at this time, the flue gas absorbs part of the heat, then the flue gas processes the water in the back combustion chamber 17 again, and then the water is gradually heated through the energy saver 16 and the condenser 15, so that the energy of the flue gas can be fully utilized, and finally the steam is discharged through the steam exhaust pipe 6.

[0032] The sealing assembly 85 comprises a heat shield 851 fixedly connected to the front side of the two connecting blocks 84, the inner side of the lifting groove 83 is rotatably connected with a bidirectional screw rod 87, the two ends of the bidirectional screw rod 87 are provided with opposite threads, and the two ends of the bidirectional screw rod 87 are respectively threadedly connected with the two connecting blocks 84, and the lower side of the side plate 81 is fixedly connected with a motor 82 driving the bidirectional screw rod 87 to rotate, when steam is needed, the external connecting pipe 7 is connected with the steam exhaust pipe 6 through the flange plate 19, and then the motor 82 is started, the motor 82 drives the bidirectional screw rod 87 to rotate, the bidirectional screw rod 87 drives the connecting block 84 to move, the two connecting blocks 84 on the two sides move close to each other, the connecting block 84 drives the heat shield 851 to move, so that the two heat shields 851 on the two sides move close to each other, the heat shield 851 blocks the flange plate 19, avoiding the steam leaking from the connection of the flange plate 19, and increasing the safety of use.

[0033] The rear side of the side plate 81 is provided with a reinforcing assembly 86, the reinforcing assembly 86 comprises an air tank 861, the air tank 861 is fixedly connected to the rear side of the side plate 81, the inner side of the air tank 861 is provided with two piston plates 862, the piston plates 862 are fixedly connected with an L-shaped plate 865 between the connecting blocks 84, the middle part of the rear side of the air tank 861 is fixedly connected with a concentrating pipe 863, two arc-shaped holes 869 are formed in the side of the heat shield 851 close to the steam exhaust pipe 6, the inner sides of the two arc-shaped holes 869 are fixedly connected with two arc-shaped air bags 8610, the two arc-shaped air bags 8610 are fixedly connected with a U-shaped pipe 868, the U-shaped pipe 868 is fixedly connected with a fixing pipe 864 between the air tank 861, when the heat shield 851 blocks the flange plate 19, the connecting block 84 drives the L-shaped plate 865 to move, the L-shaped plate 865 drives the piston plate 862, so that the two piston plates 862 are close to each other, the piston plate 862 pushes the gas in the air tank 861 out, and then passes through the concentrating pipe 863, the fixing pipe 864 and the U-shaped pipe 868, so as to conveniently inflate the two arc-shaped air bags 8610, so that the arc-shaped air bags 8610 are inflated, and the arc-shaped air bags 8610 seal the contact part of the heat shield 851 and the steam exhaust pipe 6, so as to avoid steam exhaust.

[0034] Example two

[0035] On the basis of example one, such as Figures 6-8As shown, the inner side of the heat shield 851 is fixedly connected with a guide plate 852, the inner side of the guide plate 852 is slidably connected with two guide blocks 853, one side of the guide block 853 close to the flange plate 19 is fixedly connected with a moving block 854, the outer side of the two moving blocks 854 is rotatably connected with an inclined plate one 855, the lower end of the inclined plate one 855 is rotatably connected with a lifting block 856, the outer side of the lifting block 856 is fixedly connected with a sealing arc-shaped plate 857, the sealing arc-shaped plate 857 and the guide plate 852 are fixedly connected with an extension rod two 8517, the outer side of the two guide blocks 853 is rotatably connected with an inclined plate two 858, the outer side of the inclined plate two 858 is rotatably connected with a pressing plate 859, the pressing plate 859 and the heat shield 851 are fixedly connected with an extension rod one 8510 and a spring 8511, the inner side of the heat shield 851 is fixedly connected with a connecting plate 8514, the outer side of the connecting plate 8514 is fixedly connected with a fixed support 8515, the inner side of the fixed support 8515 is fixedly connected with a squeeze air bag 8516, the squeeze air bag 8516 is located at the side of the pressing plate 859 close to the sealing arc-shaped plate 857, the other side of the pressing plate 859 is fixedly connected with a fixed rod 8512, one end of the fixed rod 8512 close to the guide plate 852 is fixedly connected with an electromagnet 8513, the inner side of the heat shield 851 is fixedly connected with a steam sensor 88, wherein the steam sensor 88 detects the steam in the heat shield 851, the model of the steam sensor 88 is Rosemount 3051S, when the steam exists, the electromagnet 8513 is started through the external controller, which is convenient for the sealing arc-shaped plate 857 to limit, when the flange plate 19 connection has steam leakage, at this time the temperature in the heat shield 851 rises, the squeeze air bag 8516 is filled with helium, so that the squeeze air bag 8516 expands, the squeeze air bag 8516 drives the pressing plate 859 to move, the pressing plate 859 drives the inclined plate two 858 to rotate, the inclined plate two 858 drives the guide block 853 to move, because the two inclined plate twos 858 are symmetrically distributed, it is convenient to control the two guide blocks 853 to move close to each other, the guide block 853 drives the moving block 854 to move, the moving block 854 drives the inclined plate one 855 to rotate, the inclined plate one 855 drives the sealing arc-shaped plate 857 on the lifting block 856 to move close to the flange plate 19, which is convenient for the sealing arc-shaped plate 857 to seal the flange plate 19 connection, reduce the steam leakage, when the sealing arc-shaped plate 857 contacts with the flange plate 19, the pressing plate 859 drives the fixed rod 8512 to move, the fixed rod 8512 drives the electromagnet 8513 to move and contact with the metal guide plate 852, which is convenient for limiting the sealing arc-shaped plate 857.

[0036] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0037] Working principle: in use, through the water inlet pipe 4 into the condenser 15, and through the flow pipe one 5, conveying pipe one 10, flow pipe two 9, flow pipe three 11, conveying pipe two 12 under the action of water into the energy saving device 16, back to the combustion chamber 17, and flow into the combustion chamber 18, while the combustion machine 2 produces high temperature flue gas, flue gas through the combustion chamber 18, back to the combustion chamber 17, energy saving device 16, condenser 15, water is heated step by step, convenient for full use of heat, finally through the smoke pipe 3 flue gas discharge, while the steam exhaust pipe 6 will steam exhaust.

[0038] When the steam is needed, the external connecting pipe 7 is connected with the steam exhaust pipe 6, and then the motor 82 is started to drive the bidirectional screw rod 87 to rotate, under the action of the connecting block 84, the heat shield 851 on the upper and lower sides is controlled to block the flange plate 19, increasing the safety of use, and at the same time, the connecting block 84 drives the L-shaped plate 865 to move, under the action of the air tank 861, the piston plate 862, the concentrating pipe 863, the fixed pipe 864 and the U-shaped pipe 868, the arc-shaped air bag 8610 is controlled to expand, which is convenient for sealing the heat shield 851, avoiding the steam from the contact between the heat shield 851 and the steam exhaust pipe 6 and the external connecting pipe 7, when the flange plate 19 leaks steam, the temperature in the heat shield 851 rises, so that the extrusion air bag 8516 expands, the pressing plate 859 is driven by the extrusion air bag 8516 to move, under the action of the inclined plate two 858, the guide block 853, the inclined plate one 855 and the lifting block 856, the sealing arc-shaped plate 857 on the upper and lower sides is facilitated to move close to the flange plate 19, which is convenient for sealing the connection of the flange plate 19, reducing the steam leakage.

[0039] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A disc-type vertical direct current steam generator, comprising a main body (1), a burner (2) fixedly connected to the upper side of the main body (1), a bottom box 1 (13) fixedly connected to the lower side of the main body (1), a bottom box 2 (14) fixedly connected to the lower side of the bottom box 1 (13), a water inlet pipe (4) and a flow pipe 1 (5) fixedly connected to the right side of the bottom box 2 (14), and a smoke outlet pipe (3) fixedly connected to the lower side of the bottom box 2 (14), characterized in that: A steam exhaust pipe (6) is fixedly connected to the left side of the main body (1), a flange (19) is provided at the left end of the steam exhaust pipe (6), an external connection pipe (7) is provided on the left side of the flange (19), a protective unit (8) is provided on the left side of the main body (1), and the protective unit (8) comprises a side plate (81), the side plate (81) is fixedly connected to the left side of the main body (1), a lifting groove (83) is provided on the outer side of the side plate (81), and two symmetrically distributed connecting blocks (84) are slidably connected to the inner side of the lifting groove (83), and a sealing assembly (85) is provided on the front side of the connecting block (84), and the sealing assembly (85) is used to block leaked steam.

2. The disc-type vertical once-through steam generator according to claim 1, characterized in that: A condenser (15) is provided on the inner side of the bottom box 2 (14), an energy saver (16) is fixedly connected to the inner side of the bottom box 1 (13), a flow tube 2 (9) and a flow tube 3 (11) are fixedly connected to the right side of the bottom box 1 (13), a delivery tube 1 (10) is fixedly connected between the flow tube 2 (9) and the flow tube 1 (5), a backfire chamber (17) is fixedly connected to the inner side of the main body (1), a combustion chamber (18) is fixedly connected to the inner side of the main body (1) and located on the upper side of the backfire chamber (17), a delivery tube 2 (12) is fixedly connected between the flow tube 3 (11) and the backfire chamber (17), the combustion chamber (18) is fixedly connected to the steam exhaust pipe (6), and the combustion chamber (18) is communicated with the backfire chamber (17).

3. The disc-type vertical once-through steam generator according to claim 1, characterized in that: The sealing assembly (85) includes a heat shield (851), the heat shield (851) is fixedly connected to the front side of the two connecting blocks (84), the inner side of the lifting groove (83) is rotatably connected to a bidirectional screw (87), the two ends of the bidirectional screw (87) are provided with opposite threads, the two ends of the bidirectional screw (87) are respectively threadedly connected to the two connecting blocks (84), and the lower side of the side plate (81) is fixedly connected to a motor (82) for driving the bidirectional screw (87) to rotate.

4. The disc-type vertical once-through steam generator according to claim 3, characterized in that: A reinforcement assembly (86) is provided on the rear side of the side plate (81), and the reinforcement assembly (86) includes an air box (861). The air box (861) is fixedly connected to the rear side of the side plate (81). Two piston plates (862) are provided on the inner side of the air box (861). An L-shaped plate (865) is fixedly connected between the piston plate (862) and the connecting block (84). A central pipe (863) is fixedly connected to the middle of the rear side of the air box (861). Two arc-shaped holes (869) are provided on the side of the heat insulation cover (851) close to the steam exhaust pipe (6). The inner sides of the two arc-shaped holes (869) are fixedly connected to arc-shaped air bags (8610). A U-shaped tube (868) is fixedly connected between the two arc-shaped air bags (8610). A fixed tube (864) is fixedly connected between the U-shaped tube (868) and the air box (861).

5. The disc-type vertical once-through steam generator according to claim 3, characterized in that: The inner side of the heat insulation cover (851) is fixedly connected to a guide plate (852), the inner side of the guide plate (852) is slidably connected to two guide blocks (853), the guide block (853) is fixedly connected to a moving block (854) on one side close to the flange (19), the outer sides of the two moving blocks (854) are both rotatably connected to an inclined plate 1 (855), the lower end of the inclined plate 1 (855) is rotatably connected to a lifting block (856), the outer side of the lifting block (856) is fixedly connected to a sealing arc plate (857), and a telescopic rod 2 (8517) is fixedly connected between the sealing arc plate (857) and the guide plate (852).

6. The disc-type vertical once-through steam generator according to claim 5, characterized in that: The outer sides of the two guide blocks (853) are both rotatably connected to inclined plates 2 (858), the outer sides of inclined plates 2 (858) are rotatably connected to pressure plates (859), telescopic rod 1 (8510) and springs (8511) are fixedly connected between the pressure plates (859) and the heat shield (851), the inner side of the heat shield (851) is fixedly connected to a connecting plate (8514), the outer side of the connecting plate (8514) is fixedly connected to a fixing frame (8515), and the inner side of the fixing frame (8515) is fixedly connected to an extrusion airbag (8516).

7. The disc-type vertical once-through steam generator according to claim 6, characterized in that: The extrusion airbag (8516) is located on one side of the pressure plate (859) close to the sealing arc plate (857); a fixing rod (8512) is fixedly connected to the other side of the pressure plate (859); an electromagnet (8513) is fixedly connected to one end of the fixing rod (8512) close to the guide plate (852); and a steam sensor (88) is fixedly connected to the inner side of the heat shield (851).

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