Sulfuric acid dropwise adding tank

Abstract

The utility model relates to the field of sulfuric acid adding devices, in particular to a sulfuric acid dropwise adding tank. Comprising a shell, the upper end of the shell fixedly communicates with an inlet pipe, the lower end of the shell fixedly communicates with a taper pipe, a taper block is movably arranged in the taper pipe and blocks the taper pipe, a square rod is concentrically fixed to the upper end of the taper block, the upper end of the square rod penetrates through the upper end of the shell, and the square rod is in sliding sealing connection with the upper end of the shell; an inverted-U-shaped upper frame is fixed to the upper end of the shell, and the lead screw penetrates through an opening of the upper frame. Through the arrangement of the taper pipe and the outer sleeve, the feeding device can be suitable for feeding pipes of reaction kettles with different diameters, and after the taper pipe is inserted into the feeding pipe, the outer sleeve can seal the feeding pipe and the taper pipe of the reaction kettle.

Description

Technical Field

[0001] The utility model relates to the field of sulfuric acid adding devices, and particularly to a sulfuric acid dropping tank. Background Art

[0002] 2-Amino-5-chloro-N,3-dimethylbenzamide is commonly used as an intermediate for the pesticide chlorantraniliprole or a pharmaceutical intermediate. During the production of 2-amino-5-chloro-N,3-dimethylbenzamide, it is necessary to first esterify 2-nitro-3-methylbenzoic acid to obtain methyl 3-methyl-2-nitrobenzoate; then aminate methyl 3-methyl-2-nitrobenzoate to obtain 2-nitro-N,3-dimethylbenzamide; then reduce 2-nitro-N,3-dimethylbenzamide to obtain 2-amino-N,3-dimethylbenzamide, and finally chlorinate 2-amino-N,3-dimethylbenzamide to obtain 2-amino-5-chloro-N,3-dimethylbenzamide.

[0003] During the esterification process of 2-nitro-3-methylbenzoic acid, a sulfuric acid dropping tank is required to drop concentrated sulfuric acid into the material in the reaction kettle.

[0004] The patent document with the application number CN202322413864.3 discloses a sulfuric acid dropping tank with a controllable dropping flow rate. When in use, the sulfuric acid receiving bottle is placed on the placing plate, and the sulfuric acid receiving bottle is adjusted to a proper position to prevent sulfuric acid from splashing during the dropping process. Then, by rotating the adjusting indicating handle and adjusting the angle between the open position indicator and the closed position indicator, the purpose of controlling the sulfuric acid dropping flow rate can be achieved. This sulfuric acid dropping tank needs to indirectly add sulfuric acid to the material by using the sulfuric acid receiving bottle, and the flow rate of sulfuric acid needs to be manually adjusted, which is inconvenient to use.

[0005] The patent document with the application number CN202321358304.6 discloses a sulfuric acid dropping tank. When in use, the entire dropping assembly is first installed at the upper end of the reaction kettle through the mounting brackets at both ends, and the lower liquid outlet is connected to the liquid inlet of the reaction kettle. When it is necessary to drop sulfuric acid into the reaction kettle, starting the cylinder inside the connection shell can drive the lower liquid storage tank to move downward. The connecting rod at the bottom of the liquid storage tank abuts against the fixing frame inside the liquid inlet of the reaction kettle. The connecting rod moves upward under the action of force. Under the action of the connecting rod, the sealing block moves upward, causing a gap between the sealing block and the sealing seat. The liquid inside the liquid storage tank enters the reaction kettle through the gap to carry out the dropping work. After the dropping is completed, the cylinder contracts. Under the reset action of the compression spring, the sealing block abuts against the sealing seat, stopping the dropping work of the liquid storage tank, enabling the sulfuric acid to be dropped into the reaction kettle at a uniform speed, and enabling the sulfuric acid to fully react in the reaction kettle. During the use of this sulfuric acid dropping tank, a fixing frame matching the connecting rod needs to be set in the liquid inlet of the reaction kettle. If there is no fixing frame in the liquid inlet of the reaction kettle, the device cannot be used, so the scope of application is small. Utility Model Content

[0006] The technical problem to be solved by the present utility model lies in a sulfuric acid dropping tank that can automatically adjust the dropping flow rate of sulfuric acid and has a wide scope of application.

[0007] In order to achieve the above object, the technical solution provided by the present utility model is:

[0008] A sulfuric acid dropping tank includes a housing. A transparent viewing window is installed at the front end of the housing. A feed pipe is fixedly communicated with the upper end of the housing. A tapered pipe is fixedly communicated with the lower end of the housing. A tapered block is movably arranged in the tapered pipe to block the tapered pipe. A square rod is concentrically fixed to the upper end of the tapered block. The upper end of the square rod penetrates through the upper end of the housing. The square rod is slidably and sealedly connected to the upper end of the housing. A lead screw is fixed to the upper end of the square rod. An inverted U-shaped upper frame is fixed to the upper end of the housing. The lead screw penetrates through the opening of the upper frame. A gear is threadedly connected to the lead screw above the upper frame. A plurality of ball bearings are rotatably connected to both the upper and lower ends of the gear. The ball bearings below the gear are in rolling contact with the upper end of the upper frame. A rack is slidably clamped on the upper frame. The rack meshes with the gear. An expansion rod is fixed to the upper frame. The telescopic end of the expansion rod is fixed to the rack. A baffle with an inverted L-shaped cross-section is fixed to the upper end of the rack. The straight part at the upper end of the baffle is located above the gear. Some of the ball bearings at the upper end of the gear are in rolling contact with the lower end surface of the straight part of the baffle. An installation assembly is arranged on the housing.

[0009] Specifically, the installation assembly includes support rods on both sides of the housing. The support rods are slidably clamped on the housing. Fixed blocks are respectively fixed to the housing above the support rods. A vertical screw rod is rotatably connected to one of the fixed blocks. The screw rod is threadedly connected to the support rod on its one side. A vertical smooth rod is fixed to the other fixed block. The smooth rod is slidably connected to the support rod on its one side.

[0010] Specifically, through holes are provided on the screw rod, and the axis of the through holes is perpendicular to the axis of the screw rod.

[0011] Specifically, an outer sleeve is sleeved outside the tapered pipe, and the outer sleeve is made of perfluoroether rubber material.

[0012] Specifically, a sealing plate is arranged below the tapered pipe. The upper end of the sealing plate is fixedly connected to the tapered block through a connecting rod. A sealing groove is provided at the lower end of the tapered pipe, and a sealing ring is installed in the sealing groove. The sealing plate is hermetically connected to the lower end of the tapered pipe through the sealing ring.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. By arranging the tapered pipe and the outer sleeve, the present utility model can be suitable for the feed pipes of reaction kettles with different diameters. After the tapered pipe is inserted into the feed pipe, the outer sleeve can seal the feed pipe of the reaction kettle and the tapered pipe.

[0015] 2. After the support rod is fixed to the upper end of the reaction kettle, the height of the housing can be adjusted by adjusting the screw rod, so as to facilitate the entry of the tapered pipe and the outer sleeve into the feed pipe of the reaction kettle, and it can be applicable to the feed pipes of reaction kettles with different diameters.

[0016] 3. By starting the telescopic rod, the rack drives the gear to rotate. During the rotation of the gear, its cooperation with the lead screw can make the square rod, the tapered block and the sealing plate move upward, so as to open the tapered pipe for dropping sulfuric acid. By adjusting the upward movement distance of the square rod, the tapered block and the sealing plate, the dropping speed of sulfuric acid can be changed, which is convenient to use.

[0017] 4. By arranging the sealing plate, further sealing of the tapered pipe can be achieved after the sulfuric acid dropping is completed, and it can prevent the sulfuric acid from continuing to flow out when the sealing between the tapered block and the tapered pipe fails, improving the sealing effect of the tapered pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the present utility model.

[0019] Figure 2 is a three-dimensional view of the present utility model.

[0020] Figure 3 is Figure 2 an enlarged view of area A in

[0021] The names of the components in the drawings are:

[0022] 1 Housing

[0023] 2 Support rod

[0024] 3 Screw rod

[0025] 4 Fixed block

[0026] 5 Through hole

[0027] 6. Cone tube

[0028] 7. Outer sleeve

[0029] 8. Cone block

[0030] 9. Connecting rod

[0031] 10. Sealing plate

[0032] 11. Sealing ring

[0033] 12. Square rod

[0034] 13. Inlet pipe

[0035] 14. Upper frame

[0036] 15. Gear

[0037] 16. Ball

[0038] 17. Rack

[0039] 18. Baffle plate

[0040] 19. Telescopic rod

[0041] 20. Transparent window

[0042] 21. Lead screw

[0043] 22. Smooth rod Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0045] Embodiment 1: Refer to Figures 1 - 3 As shown, a sulfuric acid dropping tank includes a housing 1, and a transparent window 20 is installed at the front end of the housing 1. The remaining amount of sulfuric acid in the housing 1 can be observed through the transparent window 20.

[0046] An inlet pipe 13 is fixedly connected to the upper end of the housing 1, and a cone tube 6 is fixedly connected to the lower end of the housing 1. A cone block 8 is movably arranged in the cone tube 6, and the cone block 8 seals the cone tube 6.

[0047] A square rod 12 is concentrically fixed to the upper end of the tapered block 8. The upper end of the square rod 12 passes through the upper end of the housing 1, and the square rod 12 is slidably and sealingly connected to the upper end of the housing 1. A lead screw 21 is fixed to the upper end of the square rod 12. An inverted U-shaped upper frame 14 is fixed to the upper end of the housing 1. The lead screw 21 passes through the opening of the upper frame 14. A gear 15 is threadedly connected to the lead screw 21 above the upper frame 14. A plurality of balls 16 are rotatably connected to both the upper and lower ends of the gear 15. The balls 16 below the gear 15 are in rolling contact with the upper end of the upper frame 14. A rack 17 is slidably clamped on the upper frame 14. The rack 17 meshes with the gear 15. A telescopic rod 19 is fixed to the upper frame 14. The telescopic end of the telescopic rod 19 is fixedly connected to the rack 17. A baffle 18 with an inverted L-shaped cross-section is fixed to the upper end of the rack 17. The straight part at the upper end of the baffle 18 is located above the gear 15. Some of the balls 16 at the upper end of the gear 15 are in rolling contact with the lower end surface of the straight part of the baffle 18.

[0048] An installation component is provided on the housing 1. The installation component includes support rods 2 located on both sides of the housing 1. The lower ends of the support rods 2 are bent to form bent portions. The support rods 2 are slidably clamped on the housing 1. Fixed blocks 4 are fixed to the housing 1 above the support rods 2. A vertical screw rod 3 is rotatably connected to one of the fixed blocks 4. The screw rod 3 is threadedly connected to the support rod 2 on one side of it. A through hole 5 is provided in the screw rod 3. The axis of the through hole 5 is perpendicular to the axis of the screw rod 3. The screw rod 3 can be rotated after the lever is inserted into the through hole 5.

[0049] A vertical smooth rod 22 is fixed to the other fixed block 4. The smooth rod 22 is slidably connected to the support rod 2 on one side of it.

[0050] An outer sleeve 7 is sleeved outside the tapered tube 6. The outer sleeve 7 is made of perfluoroether rubber.

[0051] After the tapered tube 6 is concentric with the feed pipe of the reactor, the lower ends of the support rods 2 are fixed to the reactor. Then, the screw rod 3 is rotated to adjust the distance between the housing 1 and the reactor, so that the tapered tube 6 is inserted into the feed pipe of the reactor, and the outer sleeve 7 is used to seal the feed pipe of the reactor and the tapered tube 6.

[0052] Add a certain amount of sulfuric acid into the housing 1 through the inlet pipe 13. When it is necessary to drip the sulfuric acid into the reaction kettle, start the telescopic rod 19 to make the rack 17 move. During the movement of the rack 17, the gear 15 rotates. Since the ball 16 at the lower end of the gear 15 is in rolling contact with the upper end of the upper frame 14, and the ball 16 at the upper end of the gear 15 is in rolling contact with the lower end of the flat part of the baffle 18. Therefore, the gear 15 is limited by the upper frame 14 and the flat part of the baffle 18. When the rack 17 moves, the gear 15 can only rotate around the axis of the lead screw 21. During the rotation of the gear 15, the lead screw 21 can drive the square rod 12 and the cone block 8 to move up and down. Adjust the movement direction of the rack 17 to limit the rotation direction of the gear 15, so that when the gear 15 rotates, the lead screw 21, the square rod 12 and the cone block 8 move upward. After the cone block 8 moves upward, a gap is generated between the cone block 8 and the cone pipe 6, and the sulfuric acid in the housing 1 can be dripped into the reaction kettle through the cone pipe 6. By adjusting the upward movement distance of the square rod 12 and the cone block 8, the gap size between the cone block 8 and the cone pipe 6 is changed, and finally the adjustment of the sulfuric acid dripping speed is realized.

[0053] Embodiment 2: On the basis of Embodiment 1, with reference to Figure 1 As shown, a sealing plate 10 is arranged below the cone pipe 6. The upper end of the sealing plate 10 is fixedly connected with the cone block 8 through a connecting rod 9. A sealing groove is opened at the lower end of the cone pipe 6, and a sealing ring 11 is installed in the sealing groove. The sealing plate 10 is hermetically connected with the lower end of the cone pipe 6 through the sealing ring 11. The sealing ring 11 is made of perfluoroether rubber material.

[0054] In this embodiment, the sealing effect on the cone pipe 6 is improved by setting the sealing plate 10. When the cone block 8 moves upward, the cone block 8 drives the sealing plate 10 to move upward through the connecting rod 9. When the sealing plate 10 is in sealing contact with the sealing ring 11, the cone pipe 6 is blocked.

[0055] By setting the sealing plate 10, further sealing of the cone pipe 6 can be realized after the sulfuric acid dripping is completed, and it can prevent the sulfuric acid from continuing to flow out when the sealing between the cone block 8 and the cone pipe 6 fails, improving the sealing effect on the cone pipe 6.

[0056] The upper end surface of the sealing plate 10 is a conical surface, thereby reducing the residual amount of sulfuric acid on the sealing plate 10 during the sulfuric acid dripping process.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sulfuric acid dropping tank, comprising a shell (1), a transparent window (20) is installed at the front end of the shell (1), and an inlet pipe (13) is fixedly connected to the upper end of the shell (1), characterized in that: The lower end of the shell (1) is fixedly connected to a conical tube (6), a conical block (8) is movably arranged in the conical tube (6), the conical block (8) blocks the conical tube (6), a square rod (12) is coaxially fixed to the upper end of the conical block (8), the upper end of the square rod (12) passes through the upper end of the shell (1), the square rod (12) and the upper end of the shell (1) are slidably sealed, a screw rod (21) is fixed to the upper end of the square rod (12), an inverted U-shaped upper frame (14) is fixed to the upper end of the shell (1), the screw rod (21) passes through an opening of the upper frame (14), a gear (15) is threadedly connected to the screw rod (21) above the upper frame (14), and the upper and lower ends of the gear (15) are rotatably connected to A plurality of balls (16) are provided, wherein the balls (16) below the gear (15) are in rolling contact with the upper end of the upper frame (14), a rack (17) is slidably engaged on the upper frame (14), the rack (17) is meshed with the gear (15), a telescopic rod (19) is fixed on the upper frame (14), the telescopic end of the telescopic rod (19) is fixedly connected with the rack (17), a baffle (18) having an inverted L-shaped cross section is fixed on the upper end of the rack (17), a straight portion of the upper end of the baffle (18) is located above the gear (15), some balls (16) at the upper end of the gear (15) are in rolling contact with the lower end surface of the straight portion of the baffle (18), and a mounting assembly is provided on the housing (1).

2. A sulfuric acid dropping tank according to claim 1, characterized in that, The mounting assembly comprises support rods (2) located on both sides of the shell (1), the support rods (2) are slidably connected to the shell (1), and fixed blocks (4) are fixed on the shell (1) above the support rods (2), one of the fixed blocks (4) is rotatably connected to a vertical screw rod (3), the screw rod (3) is threadedly connected to the support rod (2) on one side thereof, and a vertical light rod (22) is fixed on the other fixed block (4), and the light rod (22) is slidably connected to the support rod (2) on one side thereof.

3. A sulfuric acid dropping tank according to claim 2, characterized in that, The lower end of the support rod (2) is bent to form a bent portion.

4. A sulfuric acid dropping tank according to claim 2, characterized in that, The screw rod (3) is provided with a through hole (5), and the axis of the through hole (5) is perpendicular to the axis of the screw rod (3).

5. A sulfuric acid dropping tank according to claim 1, characterized in that, The outer side of the cone tube (6) is covered with an outer sleeve (7), and the outer sleeve (7) is made of perfluoroether rubber.

6. A sulfuric acid dropping tank according to claim 1, characterized in that, A sealing plate (10) is arranged below the conical tube (6), the upper end of the sealing plate (10) is fixedly connected to the conical block (8) via a connecting rod (9), a sealing groove is provided at the lower end of the conical tube (6), a sealing ring (11) is installed in the sealing groove, and the sealing plate (10) is sealingly connected to the lower end of the conical tube (6) via the sealing ring (11).

7. A sulfuric acid dropping tank according to claim 6, characterized in that, The sealing ring (11) is made of perfluoroether rubber.

8. A sulfuric acid dropping tank according to claim 6, characterized in that, The upper end surface of the sealing plate (10) is a conical surface.

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