A device for producing sodium metabisulfite and anhydrous sodium sulfite

Abstract

The utility model relates to inorganic chemical product preparation technical field discloses a kind of sodium metabisulfite and anhydrous sodium sulfite preparation device, including kettle body, the outer wall right side top of kettle body is provided with detection mechanism, the inner wall right side bottom of kettle body is provided with quick release mechanism, the outer wall top of kettle body is provided with stirring mechanism;The detection mechanism includes shell, the left end fixed connection of shell is in the outer wall right side top of kettle body, the inner wall right side of shell is rotatably connected with gear, the outer wall front end right side of shell is fixedly connected with servo motor.In the utility model, gear in shell is rotated by servo motor, tooth column is synchronously driven to make feeler rod slide in sealing sleeve by connecting rod, make the pH sensor of feeler rod bottom move along kettle body height direction, collect different height's pH data, can reflect kettle concentration distribution situation, provide accurate data to adjust sulfur dioxide injection amount, improve reaction effect.

Description

Technical Field

[0001] This utility model relates to the field of inorganic chemical product preparation technology, and in particular to an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite. Background Technology

[0002] Sodium metabisulfite and anhydrous sodium sulfite are important inorganic chemical intermediates used in key processes across multiple fields. Due to the high requirements for product purity, impurity content, and production stability in their application scenarios, and the need for targeted generation from the same raw materials under differentiated reaction conditions, the production equipment for sodium metabisulfite and anhydrous sodium sulfite is a specialized industrial equipment in the chemical industry that uses sulfur dioxide and sodium-based alkaline solution as core raw materials. By precisely controlling key parameters such as pH, temperature, and gas-liquid mixing efficiency of the reaction system, it achieves the targeted preparation of sodium metabisulfite and anhydrous sodium sulfite.

[0003] Early sodium metabisulfite and anhydrous sodium metabisulfite production devices relied on a reactor body to support the reaction, a direct-insertion vent pipe to deliver the sulfurizing agent, a stirring blade to mix the gas and liquid, and manual sampling for testing. Because the direct-insertion vent pipe could only introduce sulfur dioxide from one side of the reactor, it caused sulfur dioxide to concentrate in localized areas, resulting in uneven mixing with the alkali solution. This led to localized overreaction, producing sodium metabisulfite, while insufficient reaction at distant locations resulted in residual soda ash. To address these issues, a ring-shaped coil at the bottom of the reactor with multiple vent holes was used to achieve distributed and uniform gas supply, improving gas-liquid mixing. However, in actual operation, because the pH sensor was fixed in the middle of the reactor or at a specific height, even with stirring and mixing, a pH difference remained between the upper and lower layers due to the sulfur dioxide diffusion gradient. Fixed detection only reflected localized concentrations, leading to incomplete data when adjusting the sulfur dioxide injection rate. This resulted in overreaction at the bottom, producing impurities, or insufficient reaction at the top, failing to meet user needs. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a device for producing sodium metabisulfite and anhydrous sodium sulfite, aiming to improve the existing technology where the fixed pH sensor can only reflect the local concentration, resulting in incomplete data when adjusting the amount of sulfur dioxide injected, leading to problems such as over-reaction at the bottom generating impurities or insufficient reaction at the top.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a device for producing sodium metabisulfite and anhydrous sodium sulfite, comprising a vessel body, wherein a detection mechanism is provided on the top right side of the outer wall of the vessel body, a quick-release mechanism is provided on the bottom right side of the inner wall of the vessel body, and a stirring mechanism is provided on the top of the outer wall of the vessel body;

[0006] The detection mechanism includes a housing. The left end of the housing is fixedly connected to the top right side of the outer wall of the vessel. A gear is rotatably connected to the right side of the inner wall of the housing. A servo motor is fixedly connected to the right front end of the outer wall of the housing. The output end of the servo motor passes through the front end of the housing and is fixedly connected to the front end of the gear. A gear column is slidably connected to the left side of the inner wall of the housing. The gear meshes with the gear column. Both the upper and lower ends of the gear column pass through the inner wall of the housing. A connecting rod is fixedly connected to the left side of the outer wall of the gear column. A sealing sleeve is fixedly connected to the top right side of the outer wall of the vessel. A probe is slidably connected to the inner wall of the sealing sleeve. The top right side of the outer wall of the probe is fixedly connected to the left end of the connecting rod. The bottom of the probe passes through the top of the outer wall of the vessel. A pH sensor is installed at the bottom of the probe.

[0007] As a further description of the above technical solution:

[0008] The quick-release mechanism includes a rotating sleeve, the inner wall of which is rotatably connected to the bottom of the outer wall of the probe. Limiting rods are fixedly connected to the left and right sides of the bottom of the rotating sleeve. Sliding grooves are provided on the left and right sides of the bottom of the outer wall of the probe. Connecting ears are fixedly connected to the left and right sides of the top of the outer wall of the pH sensor. One side of each connecting ear is slidably connected to the inner wall of the corresponding sliding groove. A spring is fixedly connected to the top of the inner side of the probe. A compression plate is slidably connected to the inner wall of the probe. The bottom of the spring is fixedly connected to the top of the compression plate.

[0009] As a further description of the above technical solution:

[0010] The stirring mechanism includes a drive motor, the bottom of which is fixedly connected to the top of the outer wall of the vessel. The output end of the drive motor passes through the top of the vessel and is fixedly connected to a stirring shaft. Two connecting rings are fixedly connected to the bottom of the outer wall of the stirring shaft, and stirring blades are fixedly connected to both sides of the outer wall of the two connecting rings.

[0011] As a further description of the above technical solution:

[0012] The top left side of the vessel is connected to a gas injection pipe, and a coil is fixedly connected to the bottom of the gas injection pipe. Multiple gas outlet holes are opened on the bottom of the outer wall of the coil.

[0013] As a further description of the above technical solution:

[0014] The rear side of the vessel body is connected to an inspection cylinder, and the top of the inspection cylinder is provided with a transparent cover. The top of the transparent cover is threaded with multiple bolts, and the bottom ends of the multiple bolts all penetrate the top of the transparent cover and are threadedly connected to the top of the inspection cylinder.

[0015] As a further description of the above technical solution:

[0016] The outer wall of the vessel is fixedly connected to a jacket. The top left side of the outer wall of the jacket is connected to a water inlet pipe, and the bottom right side of the outer wall of the jacket is connected to a water outlet pipe.

[0017] As a further description of the above technical solution:

[0018] The top front of the vessel is connected to a liquid injection pipe, and the bottom of the vessel is connected to a liquid outlet pipe. A valve is installed on the outer wall of the liquid outlet pipe.

[0019] As a further description of the above technical solution:

[0020] The outer diameter of the top of the outer wall of the pH sensor matches the inner diameter of the probe, and the outer walls of the two limiting rods are slidably connected to the inner side of the corresponding connecting lugs.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a servo motor drives the gear inside the housing to rotate. Through the meshing transmission between the gear and the tooth column, the tooth column is driven to slide up and down along the housing. The tooth column synchronously drives the probe to slide inside the sealing sleeve through the connecting rod, so that the pH sensor at the bottom of the probe moves along the height direction of the vessel and collects acid and alkalinity data at different heights. This can reflect the concentration distribution inside the vessel and provide accurate data for adjusting the amount of sulfur dioxide injected, thereby improving the reaction effect.

[0023] 2. In this utility model, force is applied to rotate the rotating sleeve, causing it to drive the limiting rods on both sides to rotate synchronously, disengaging from the connecting ears, releasing the fixation of the pH sensor, and completing the disassembly. During installation, the connecting ears on both sides of the pH sensor are aligned with the sliding groove of the probe, allowing the sensor to slide upward along the sliding groove. When the connecting ears are fully inserted, the rotating sleeve is rotated in the opposite direction, causing the limiting rods to rotate to the inside of the connecting ears, forming a radial lock, thus achieving quick installation. Attached Figure Description

[0024] Figure 1 This is a perspective view of an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to the present invention.

[0025] Figure 2 This is a front view of an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to the present invention.

[0026] Figure 3 This is a cross-sectional view of the reactor body structure of an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to the present invention.

[0027] Figure 4 This is a cross-sectional view of the probe structure of an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to the present invention.

[0028] Figure 5 This is a partial structural exploded view of an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to the present invention.

[0029] Figure 6 This is a partial structural schematic diagram of an apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to the present invention.

[0030] Legend:

[0031] 1. Vessel body; 2. Detection mechanism; 201. Shell; 202. Servo motor; 203. Gear; 204. Gear column; 205. Connecting rod; 206. Sealing sleeve; 207. Probe rod; 208. pH sensor; 3. Quick release mechanism; 301. Rotating sleeve; 302. Connecting ear; 303. Slide groove; 304. Spring; 305. Extrusion plate; 306. Limiting rod; 4. Stirring mechanism; 401. Drive motor; 402. Stirring shaft; 403. Connecting ring; 404. Stirring blade; 5. Gas injection pipe; 6. Coil; 7. Gas outlet; 8. Manhole; 9. Transparent cover; 10. Bolt; 11. Jacket; 12. Water inlet pipe; 13. Water outlet pipe; 14. Liquid injection pipe; 15. Liquid outlet pipe; 16. Valve. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 1 , Figure 3 and Figure 6 An embodiment of this utility model provides a device for producing sodium metabisulfite and anhydrous sodium sulfite, including a vessel body 1. The vessel body 1 provides a closed space for gas-liquid reaction. The inner wall is polished to reduce material residue and local wall adhesion, and to ensure uniform flow of the reaction liquid. A detection mechanism 2 is provided on the top right side of the outer wall of the vessel body 1. A quick-release mechanism 3 is provided on the bottom right side of the inner wall of the vessel body 1. A stirring mechanism 4 is provided on the top of the outer wall of the vessel body 1.

[0034] The detection mechanism 2 includes a housing 201, which provides installation and protection space for the internal gear 203 and gear 204. The left end of the housing 201 is fixedly connected to the top right side of the outer wall of the vessel body 1. The gear 203 is rotatably connected to the right side of the inner wall of the housing 201. A servo motor 202 is fixedly connected to the right side of the front end of the outer wall of the housing 201, providing power for transmission. The output end of the servo motor 202 passes through the front end of the housing 201 and is fixedly connected to the front end of the gear 203. The gear 204 is slidably connected to the left side of the inner wall of the housing 201. The gear 203 meshes with the gear 204, converting the rotational motion into the linear motion of the gear 204. The gear 203 and the gear 204 are meshed and connected. Both the upper and lower ends of the gear 204 are connected through... A connecting rod 205 is fixedly connected to the left side of the outer wall of the toothed column 204, which penetrates the inner wall of the shell 201. The connecting rod 205 transmits the linear movement of the toothed column 204 to the probe 207, ensuring that the probe 207 moves synchronously with the toothed column 204. A sealing sleeve 206 is fixedly connected to the top right side of the outer wall of the vessel 1. The sealing sleeve 206 has a sealing effect to prevent leakage at the connection. The probe 207 is slidably connected to the inner wall of the sealing sleeve 206. The probe 207 provides support and protection for the pH sensor 208. The top right side of the outer wall of the probe 207 is fixedly connected to the left end of the connecting rod 205. The bottom of the probe 207 penetrates the top of the outer wall of the vessel 1. A pH sensor 208 is set at the bottom of the probe 207. The pH sensor 208 is used to collect acidity and alkalinity data.

[0035] The stirring mechanism 4 includes a drive motor 401, which provides power for stirring. The bottom of the drive motor 401 is fixedly connected to the top of the outer wall of the vessel 1. The output end of the drive motor 401 passes through the top of the vessel 1 and is fixedly connected to a stirring shaft 402. The stirring shaft 402 transmits the motor power to the stirring blades 404. Two connecting rings 403 are fixedly connected to the bottom of the outer wall of the stirring shaft 402. Stirring blades 404 are fixedly connected to both sides of the outer wall of the two connecting rings 403. The gas and liquid react repeatedly by rotating the stirring blades 404.

[0036] A gas injection pipe 5 is connected to the top left side of the vessel body 1 to transport the reaction gas to the coil 6 at the bottom of the vessel body 1. The bottom of the gas injection pipe 5 is fixedly connected to the coil 6. Multiple gas outlet holes 7 are opened at the bottom of the outer wall of the coil 6 to increase the diffusion area of ​​the gas.

[0037] Specifically, after the alkali solution is injected into the vessel 1 through the injection pipe 14, sulfur dioxide is transported to the coil 6 at the bottom of the vessel 1 through the gas injection pipe 5. Then, it diffuses evenly into the alkali solution through multiple gas outlets 7 at the bottom of the coil 6, achieving distributed gas contact. Simultaneously, the drive motor 401 drives the stirring shaft 402 and the stirring blades 404 on the connecting ring 403 to rotate, creating a stirring action to promote the gas-liquid mixing reaction. Subsequently, the servo motor 202 drives the gear 203 inside the housing 201 to rotate. Through the meshing transmission between the gear 203 and the gear column 204, the gear column 204 slides up and down along the housing 201. The gear column 204 is connected to the connecting rod... 205 synchronously drives the probe 207 to slide within the sealing sleeve 206, causing the pH sensor 208 at the bottom of the probe 207 to move along the height direction of the vessel body 1. The pH sensor 208 collects acidity and alkalinity data at different heights in real time to reflect the concentration distribution inside the vessel. By adjusting the amount of sulfur dioxide injected, the pH value is changed, thereby achieving different generation results. When the pH value is low, sodium metabisulfite is ultimately generated; conversely, anhydrous sodium sulfite is ultimately generated. Based on the concentration distribution data, the amount of sulfur dioxide injected is adjusted to ensure uniform reaction and reduce local over-reaction or under-reaction, so as to stably produce the target product.

[0038] Reference Figure 3 , Figure 4 and Figure 5The quick-release mechanism 3 includes a rotating sleeve 301, the inner wall of which is rotatably connected to the bottom of the outer wall of the probe 207. Limiting rods 306 are fixedly connected to the left and right sides of the bottom of the rotating sleeve 301. Rotation of the rotating sleeve 301 causes the limiting rods 306 to engage or disengage from the connecting ears 302, thus locking and unlocking the sensor. Sliding grooves 303 are provided on the left and right sides of the bottom of the outer wall of the probe 207. The sliding grooves 303 provide insertion guidance for the connecting ears 302 of the pH sensor 208. Connecting ears 302 are fixedly connected to the left and right sides of the top of the outer wall of the pH sensor 208. One side of each connecting ear 302 is slidably connected to the inner wall of the corresponding sliding groove 303. A spring 304 is fixedly connected to the top of the inner side of the probe 207. During disassembly, the spring 304 resets and pushes the squeezing plate 305 to eject the sensor. During installation, the squeezing plate... The spring 304 is compressed by the plate 305 to store elastic force. The elastic force causes the connecting ear 302 to continuously press the limiting rod 306 to prevent the rotating sleeve 301 from loosening. The inner wall of the probe 207 is slidably connected to the extrusion plate 305. The bottom of the spring 304 is fixedly connected to the top of the extrusion plate 305. The outer diameter of the top of the outer wall of the pH sensor 208 matches the inner diameter of the probe 207. The outer walls of the two limiting rods 306 are slidably connected to the inner side of the corresponding connecting ear 302. The rear side of the vessel body 1 is connected to the inspection cylinder 8, which provides an operating channel for sensor disassembly and assembly. The top of the inspection cylinder 8 is provided with a transparent cover 9, which facilitates observation of the internal operation. The top of the transparent cover 9 is threaded with multiple bolts 10, and the bottom ends of the multiple bolts 10 all penetrate the top of the transparent cover 9 and are threadedly connected to the top of the inspection cylinder 8.

[0039] Specifically, when pH sensor 208 needs to be calibrated or maintained, first unscrew the bolt 10 at the top of the inspection cylinder 8, open the transparent cover 9, and the operator touches the rotating sleeve 301 at the bottom of the probe 207 through the inspection cylinder 8 and applies force to rotate the rotating sleeve 301, causing it to drive the limiting rods 306 on both sides to rotate synchronously. When the gap between the two limiting rods 306 aligns with the corresponding sliding groove 303, the limiting rods 306 disengage from the connecting ear 302, thereby releasing the fixation of pH sensor 208. The spring 304 at the top of the inner side of the probe 207 resets, and the pH sensor 208 is ejected from the bottom of the probe 207 by the squeezing plate 305, completing the disassembly operation. During installation, align the top of the pH sensor 208 with the bottom of the probe 207, and align the connecting ears 302 on both sides of the sensor with the slide grooves 303 of the probe 207. Press the sensor to make it slide upward along the slide grooves 303. The compression plate 305 compresses the spring 304 to store elastic force. When the connecting ears 302 are fully inserted, rotate the rotating sleeve 301 in the opposite direction, causing the limiting rod 306 to rotate to the inside of the connecting ears 302, forming a radial lock. At the same time, the elastic force of the spring 304 is transmitted to the pH sensor 208 through the compression plate 305, causing the connecting ears 302 to generate downward pressure, which in turn presses the limiting rod 306, preventing the rotating sleeve 301 from rotating freely and ensuring that the sensor is fixed and secure.

[0040] Reference Figure 1 , Figure 2 and Figure 3 A jacket 11 is fixedly connected to the outer wall of the vessel body 1. A water inlet pipe 12 is connected to the top left side of the outer wall of the jacket 11. Cooling water enters from the water inlet pipe 12 and flows along the inner wall of the jacket 11. A water outlet pipe 13 is connected to the bottom right side of the outer wall of the jacket 11. After absorbing the residual heat of the reaction, the water is discharged from the water outlet pipe 13. A liquid injection pipe 14 is connected to the front top of the vessel body 1. The liquid injection pipe 14 is used to inject alkaline solution. A liquid outlet pipe 15 is connected to the bottom of the vessel body 1. The liquid outlet pipe 15 is used to discharge the reaction liquid. A valve 16 is provided on the outer wall of the liquid outlet pipe 15. When the valve 16 is closed, the vessel body 1 can be sealed.

[0041] Specifically, the injection pipe 14 serves as the input channel for the alkali solution. According to the target product, the operator injects the alkali solution of a preset concentration into the reactor body 1 through the injection pipe 14. Depending on the reaction requirements, cooling water is introduced into the water inlet pipe 12 at the top left side of the jacket 11. The cooling water flows along the inner wall of the jacket 11, absorbing the heat released by the reaction inside the reactor, and is discharged through the water outlet pipe 13 at the bottom right side to maintain a stable temperature inside the reactor. The valve 16 on the outer wall of the outlet pipe 15 is opened, and the reaction liquid inside the reactor body 1 is discharged through the outlet pipe 15.

[0042] Working principle: After the alkaline solution is injected into the vessel 1 through the injection pipe 14, sulfur dioxide is transported to the coil 6 at the bottom of the vessel 1 through the gas injection pipe 5. Then, it is evenly diffused into the alkaline solution through multiple gas outlets 7 at the bottom of the coil 6, realizing distributed gas contact. At the same time, the drive motor 401 drives the stirring shaft 402 and the stirring blades 404 on the connecting ring 403 to rotate, forming a stirring to promote the gas-liquid mixing reaction. Subsequently, the servo motor 202 drives the gear 203 inside the shell 201 to rotate. Through the meshing transmission between the gear 203 and the toothed column 204, the toothed column 204 is driven to slide up and down along the shell 201. The toothed column 204 drives the probe 207 to slide in the sealing sleeve 206 through the connecting rod 205, so that the pH sensor 208 at the bottom of the probe 207 moves along the height direction of the vessel 1. The pH sensor 208 collects the acidity and alkalinity data at different heights in real time, reflecting the concentration distribution in the vessel. Based on the concentration distribution data, the amount of sulfur dioxide injected is adjusted to ensure uniform reaction, reduce the problem of local over-reaction or under-reaction, and stably produce the target product.

[0043] Furthermore, when pH sensor 208 needs calibration or maintenance, first unscrew the bolt 10 at the top of the inspection cylinder 8, open the viewing cover 9, and the operator contacts the rotating sleeve 301 at the bottom of the probe 207 through the inspection cylinder 8. Apply force to rotate the rotating sleeve 301, causing the limiting rods 306 on both sides to rotate synchronously. When the gap between the two limiting rods 306 aligns with the corresponding sliding groove 303, the limiting rods 306 disengage from the connecting ear 302, releasing the pH sensor 208 from its fixation. The spring 304 at the top inner side of the probe 207 resets, and the pH sensor 208 is ejected from the bottom of the probe 207 by the squeezing plate 305, completing the disassembly. During installation, [the process is as follows]. Align the top of the pH sensor 208 with the bottom of the probe 207, aligning the connecting ears 302 on both sides of the sensor with the grooves 303 of the probe 207. Press the sensor to make it slide upward along the grooves 303. The compression plate 305 compresses the spring 304 to store elastic force. When the connecting ears 302 are fully inserted, rotate the rotating sleeve 301 in the opposite direction, causing the limiting rod 306 to rotate to the inside of the connecting ears 302, forming a radial lock. At the same time, the elastic force of the spring 304 is transmitted to the pH sensor 208 through the compression plate 305, causing the connecting ears 302 to generate downward pressure, which in turn compresses the limiting rod 306, preventing the rotating sleeve 301 from rotating freely and ensuring that the sensor is firmly fixed.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An apparatus for producing sodium metabisulfite and anhydrous sodium sulfite, comprising a vessel body (1), characterized in that: A detection mechanism (2) is provided on the top right side of the outer wall of the vessel (1), a quick-release mechanism (3) is provided on the bottom right side of the inner wall of the vessel (1), and a stirring mechanism (4) is provided on the top of the outer wall of the vessel (1). The detection mechanism (2) includes a housing (201). The left end of the housing (201) is fixedly connected to the top right side of the outer wall of the vessel body (1). A gear (203) is rotatably connected to the right side of the inner wall of the housing (201). A servo motor (202) is fixedly connected to the right side of the front end of the outer wall of the housing (201). The output end of the servo motor (202) passes through the front end of the housing (201) and is fixedly connected to the front end of the gear (203). A toothed column (204) is slidably connected to the left side of the inner wall of the housing (201). The gear (203) meshes with the toothed column (204). The toothed column (204) is connected to the inner wall of the shell (201) at both the upper and lower ends. A connecting rod (205) is fixedly connected to the left side of the outer wall of the toothed column (204). A sealing sleeve (206) is fixedly connected to the top right side of the outer wall of the vessel body (1). A probe (207) is slidably connected to the inner wall of the sealing sleeve (206). The top right side of the outer wall of the probe (207) is fixedly connected to the left end of the connecting rod (205). The bottom of the probe (207) penetrates the top of the outer wall of the vessel body (1). A pH sensor (208) is provided at the bottom of the probe (207).

2. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 1, characterized in that: The quick-release mechanism (3) includes a rotating sleeve (301), the inner wall of which is rotatably connected to the bottom of the outer wall of the probe (207), and a limit rod (306) is fixedly connected to the bottom left and right sides of the rotating sleeve (301). The bottom left and right sides of the outer wall of the probe (207) are provided with sliding grooves (303). The top left and right sides of the outer wall of the pH sensor (208) are fixedly connected with connecting ears (302). One side of each connecting ear (302) is slidably connected to the inner wall of the corresponding sliding groove (303). The top inner side of the probe (207) is fixedly connected with a spring (304), and the inner wall of the probe (207) is slidably connected with a pressing plate (305). The bottom of the spring (304) is fixedly connected to the top of the pressing plate (305).

3. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 1, characterized in that: The stirring mechanism (4) includes a drive motor (401). The bottom of the drive motor (401) is fixedly connected to the top of the outer wall of the vessel body (1). The output end of the drive motor (401) passes through the top of the vessel body (1) and is fixedly connected to a stirring shaft (402). Two connecting rings (403) are fixedly connected to the bottom of the outer wall of the stirring shaft (402). Stirring blades (404) are fixedly connected to both sides of the outer wall of the two connecting rings (403).

4. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 1, characterized in that: The top left side of the vessel body (1) is connected to an air injection pipe (5), and the bottom of the air injection pipe (5) is fixedly connected to a coil (6). Multiple air outlet holes (7) are opened at the bottom of the outer wall of the coil (6).

5. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 1, characterized in that: The rear side of the vessel body (1) is connected to a maintenance cylinder (8), and a viewing cover (9) is provided on the top of the maintenance cylinder (8). Multiple bolts (10) are threadedly connected to the top of the viewing cover (9), and the bottom ends of the multiple bolts (10) penetrate the top of the viewing cover (9) and are threadedly connected to the top of the maintenance cylinder (8).

6. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 1, characterized in that: The outer wall of the vessel body (1) is fixedly connected to a jacket (11), the top left side of the outer wall of the jacket (11) is connected to a water inlet pipe (12), and the bottom right side of the outer wall of the jacket (11) is connected to a water outlet pipe (13).

7. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 1, characterized in that: The top front of the vessel body (1) is connected to a liquid injection pipe (14), and the bottom of the vessel body (1) is connected to a liquid outlet pipe (15). A valve (16) is provided on the outer wall of the liquid outlet pipe (15).

8. The apparatus for producing sodium metabisulfite and anhydrous sodium sulfite according to claim 2, characterized in that: The outer diameter of the top of the outer wall of the pH sensor (208) matches the inner diameter of the probe (207), and the outer walls of the two limiting rods (306) are slidably connected to the inner side of the corresponding connecting ear (302).

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