A chemical combination screw pump and its use method

Abstract

The present invention discloses a chemical combination screw pump and a method of using the same, which relates to the technical field of chemical material mixing; it comprises a pump unit A and a pump unit B which are arranged at a certain angle and are interconnected, the pump body of pump A is provided with a meshing spiral sleeve which rotates synchronously in opposite directions, and a tapered hole is opened on the side wall; the pump body of pump B is provided with a spiral sleeve with a stirring rod, and the stirring rod extends into the tapered hole. The end face of the spiral sleeve adopts a cycloid sealing tooth shape, and a sharp cutting edge is formed at its intersection c. The present invention uses a unique combination of two groups of screw pumps, so that two materials enter separately and the materials are mixed and transported at the same time, avoiding large-scale solidification phenomenon; at the same time, combined with the dual cutting and crushing effect of the stirring rod and the sharp cutting edge, the local solidification is promptly crushed, which solves the problem of solidification jamming caused by uneven mixing in traditional reaction tanks, greatly improves the mixing and transportation efficiency, and reduces manpower and time costs.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical material mixing, in particular to a chemical combination screw pump and a use method thereof. Background Art

[0002] In chemical production, the mixing of liquid raw materials is typically performed in a container, such as a reaction tank, through macroscopic material movement (e.g., flow and tumbling). The reaction tank is typically equipped with an agitator. Different raw materials are added to the reaction tank in a specific proportion and stirred by the agitator. The raw materials interact or react chemically to form intermediate or finished products.

[0003] However, for certain special raw materials, a simple reaction tank alone cannot achieve a uniform mixing. For example, when material X and material Y meet, they may react very quickly. Before the agitator can fully mix them, the two materials have already met and partially solidified, preventing them from being fully and evenly mixed. In chemical production, substandard product quality due to uneven mixing of raw materials is a common problem. This has long plagued chemical design and production. To address this, we provide a chemical combination screw pump and its use method. Summary of the Invention

[0004] The purpose of the present invention is to provide a chemical combination screw pump and a method of using the same, so that it can be used to fully and evenly mix and transport two groups of chemical materials, providing another way to mix chemical raw materials to solve the above-mentioned problems.

[0005] The present invention can be implemented through the following technical solutions: A chemical combination screw pump includes a base, on which a pump unit A and a pump unit B connected and matched with each other are fixedly installed at a certain angle;

[0006] Pump unit A includes a pump body A, the inner cavity of which is provided with two mutually meshing spiral sleeves that rotate side by side, and the two spiral sleeves rotate synchronously towards each other; a tapered hole is provided on the side of pump body A close to pump unit B, which is connected to pump unit B;

[0007] The B pump unit includes a B pump body, an inner cavity of which is also provided with two spiral sleeves that rotate side by side and mesh with each other, and a stirring rod is coaxially fixed to the end of one of the spiral sleeves, and the stirring rod extends into the tapered hole on the side of the A pump body to stir and cut the mixed material accumulated at this position.

[0008] A further technical improvement of the present invention is that the spiral surfaces of the spiral sleeves are all provided with the same sealing tooth shape, and the end interface shape is a cycloid. The cycloid is formed in the following process: when the pitch circle of one of the spiral sleeves is used as the moving circle and pure rolling motion is performed along the pitch circle of the other spiral sleeve as the fixed circle, a point on the outer circumference of the moving circle is used as the trajectory formed by the cycloid point.

[0009] A further technical improvement of the present invention is that the end of the spiral sleeve extends to a swing point on the cycloid and forms a cutting edge with a sharp angle. The swing point is the intersection of the cycloid and the outer circle of the spiral sleeve.

[0010] A further technical improvement of the present invention is that a positioning boss is coaxially provided on the outside of the tapered hole of the pump body of pump A, and a recessed platform that matches the shape of the positioning boss is provided at the second pump outlet position of the pump body of pump B. When the pump unit A and the pump unit B are connected, the positioning boss and the recessed platform are positioned in a transition fit manner, and finally the two units are fixed with bolts.

[0011] A further technical improvement of the present invention is that the tapered hole is located within the area where the two spiral sleeves in the pump body of pump A are meshed with each other.

[0012] A further technical improvement of the present invention is that the stirring rod includes a rod blade and a rod handle, the rod handle is connected to the central axis of the corresponding spiral sleeve by a thread, and the thread rotation direction is opposite to the rotation direction of the spiral sleeve; the rod blade is arranged in a thin sheet shape, the corresponding end of the rod handle is grooved, and the rod blade is riveted in the groove.

[0013] A further technical improvement of the present invention is that the gap between the outer edge of the stem blade and the conical surface of the conical hole is set to 0.5-3 mm.

[0014] A further technical improvement of the present invention is that the transmission structure of pump unit A and pump unit B is the same, and the transmission structure includes a transmission box, in which a driving shaft and a driven shaft are installed for parallel rotation. The outer circumference of the two shafts are provided with mutually meshing gears. One end of the driving shaft is connected to the motor through a coupling, and the ends of the two shafts away from the motor are coaxially fixed to two spiral sleeves respectively.

[0015] A further technical improvement of the present invention is that the ratio of the conveying amount of the two materials by the pump body of pump A and the pump body of pump B is achieved by adjusting the rotational speed of the motors of the two units.

[0016] A method for using a chemical combination screw pump, the method comprising the following steps:

[0017] Step 1: First, start pump unit A and feed material X from the inlet of pump unit A. After material X flows out from the outlet of the unit, start pump unit B and feed material Y from the inlet of pump unit B.

[0018] Step 2: Material X and material Y meet and mix in the area near the tapered hole to obtain a mixture, which is then delivered from the outlet of pump unit A, completing the mixing and delivery of the two materials. During the mixing process, this step also includes the following steps:

[0019] S21: When the two materials are mixed at the tapered hole, local solidification may occur. The stirring rod rotates synchronously with a spiral sleeve of the B pump unit, stirring the materials and cutting the solidified materials at the same time.

[0020] S22: When the mixed material is conveyed to the end of the spiral sleeve, the cutting edge formed at the swing point of the cycloid at the end thereof will scrape and crush the solidified material during the mixing and conveying process.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention replaces the mixing methods of certain chemical raw materials such as reaction tank agitators through a unique combination of two groups of screw pumps, avoiding the uneven mixing of raw materials and poor mixing effect; at the same time, compared with the reaction tank agitator, the loading and unloading processes of the present invention can be sustained, thereby achieving uninterrupted stirring and conveying, avoiding the phenomenon of large-scale solidification, greatly improving efficiency, and reducing the manpower and time costs generated by loading, unloading and material transfer.

[0023] 2. The present invention reduces the occurrence of large-scale solidification by adopting this method of mixing and conveying at the same time. For small-area local solidification, on the one hand, the present invention uses a stirring rod to stir and break the local solidification in the mixed material, so that the material of pump B can smoothly enter pump A and mix with the material of group A; on the other hand, the present invention also uses the cutting effect of the sharp edge generated between point c of the spiral sleeve sealing tooth shape abc and the outer circle of pump A, so that the local solidification generated when the two materials are mixed can be scraped and broken, preventing the problem of solidification and blocking of the unit.

[0024] 3. The split riveted structure of the stirring rod (rod blade + rod handle) of the present invention can reduce flow resistance and maximize flow rate; the thread rotation direction is opposite to that of the spiral sleeve, which can effectively prevent loosening and falling off.

[0025] 4. The present invention optimizes the startup process. Pump A is started first and then pump B to prevent material Y from entering pump A in advance and causing solidification. Pump B is stopped first and then pump A to avoid residual material Y from accumulating and solidifying in the tapered hole, thereby protecting the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0027] Figure 1It is a schematic top view of the overall external structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the main structure of the pump unit A of the present invention;

[0029] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the pump unit A of the present invention;

[0030] Figure 4 Schematic diagram of the sealing tooth structure of the spiral surfaces of the two spiral sleeves of pump A of the present invention;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the spiral sleeve of the present invention;

[0032] Figure 6 This is a schematic diagram of the vertical cross-sectional structure of the B pump unit of the present invention;

[0033] Figure 7 A side cross-sectional view of the joint surface of the pump A and pump B units of the present invention;

[0034] Figure 8 This is a side sectional view of the matching relationship between the stirring rod and the tapered hole of the present invention;

[0035] Figure 9 This is a cross-sectional view of the stirring rod of the present invention.

[0036] In the figure: 1. Base; 2. Pump unit A; 3. Pump unit B; 11. Motor 1; 12. Coupling 1; 13. Transmission box 1; 14. Pump body of Pump A; 15. Tapered hole; 16. Positioning boss; 17. Pump inlet 1; 18. Pump outlet 1; 131. Driving shaft 1; 132. Driven shaft 1; 133. Left spiral sleeve; 134. Right spiral sleeve; 135. Bearing; 136. Gear pair 1; 137. Sealing ring; 21. Motor 2; 22. Coupling 2; 23. Transmission box 2; 24. Pump body of Pump B; 25. Pump inlet 2; 26. Pump outlet 2; 231. Driving shaft 2; 232. Driven shaft 2; 233. Agitator rod; 234. Spiral sleeve; 235. Concave platform; 2331. Rod blade; 2332. Petiole. DETAILED DESCRIPTION

[0037] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0038] See also Figure 1As shown, a chemical combination screw pump includes a base 1 and a top portion thereof with pump unit A 2 and pump unit B 3 mounted thereon. The base 1 is a split assembly or an integrated base. In this embodiment, the axis lines of pump unit A 2 and pump unit B 3 are arranged perpendicularly. In other embodiments, the angle between the axis lines of the two can be set to an acute angle or an obtuse angle.

[0039] like Figure 2-3 As shown, the A pump unit 2 includes an A pump body 14, a transmission box 13 is provided on one side of the A pump body 14, and one side of the transmission box 13 is connected to the motor 11 through a coupling 12; a pump inlet 17 and a pump outlet 18 are provided on the A pump body 14, which are positioned vertically; a tapered hole 15 is provided on the side wall of the A pump body 14 close to the B pump unit 3, and a positioning boss 16 is coaxially provided on the outside of the tapered hole 15. The tapered hole 15 is an inner hole that is larger on the outside and smaller on the inside relative to the side wall of the A pump body 14.

[0040] The transmission box 13 is fixed to the base 1, and a driving shaft 131 and a driven shaft 132 are arranged in parallel in the inner cavity thereof. Both shafts are connected to the transmission box 13 for relative rotation via a bearing 135. The pump body 14 of the pump A is fixed to the transmission box 13 by bolts. One end of the driving shaft 131 and the driven shaft 132 extend into the pump body 14 of the pump A, and a sealing ring 137 is provided on the outside of both to ensure the independent sealing of the transmission box 13 and the inner cavity of the pump body 14 of the pump A. The outer periphery of the other end of the driving shaft 131 and the driven shaft 132 is fixed with a gear pair 136 that meshes with each other for transmission. The driving shaft 131 is connected to the motor 11 via a coupling 12 to obtain power.

[0041] The driving shaft 131 and the driven shaft 132 are located in the cavity of the pump body 14 of pump A, and are respectively fixed with a left spiral sleeve 133 and a right spiral sleeve 134 at one end, and the left spiral sleeve 133 and the right spiral sleeve 134 are engaged with each other, and the tapered hole 15 is located in the area where the left spiral sleeve 133 and the right spiral sleeve 134 are engaged with each other.

[0042] It should be noted that the left spiral sleeve 133 and the right spiral sleeve 134 are provided with the same sealing tooth shape on the spiral surface, and the shape of the end interface is a cycloid abc; the formation process of the cycloid is: when the pitch circle of one spiral sleeve is used as the moving circle and the pitch circle of the other spiral sleeve is used as the fixed circle for pure rolling motion, a point on the outer circumference of the moving circle is formed as the oscillation point; as shown in FIG. Figure 4 As shown, assuming that the pitch circles of the left and right spiral sleeves 133 and 134 are both d, the sealing tooth profile abc of the spiral surface of the right spiral sleeve 134 is a trajectory formed by the outer circle point a of the left spiral sleeve 133 as the cycloid point when the left spiral sleeve 133 is purely rolled along the pitch circle d of the right spiral sleeve 134 as the fixed circle, wherein point c is the intersection of the cycloid line and the outer circle of the spiral sleeve; Figure 5As shown, the cycloid abc ends at point c of the end of the spiral sleeve and forms a cutting edge with a sharp angle, so as to cut the material that may solidify while the material is mixed and conveyed.

[0043] When pump unit A 2 is working, motor 11 drives driving shaft 131 to rotate through coupling 12, and then drives driven shaft 132 to rotate through gear pair 136, thereby driving the left spiral sleeve 134 and the right spiral sleeve 135 at the other ends of the two shafts to rotate synchronously in opposite directions to transport materials.

[0044] like Figure 6-7 As shown, the overall structure of the B pump unit 3 is the same as that of the A pump unit 2, including a B pump body 24, a transmission box 23 fixedly connected to one side of the B pump body 24, a driving shaft 231 and a driven shaft 232 are installed in parallel in the transmission box 23, and a mutually meshing gear set is coaxially fixed on the outer side of the two shafts in the inner cavity of the transmission box 23, wherein the driving shaft 231 is connected to the output end of the motor 21 through the coupling 22 to obtain the driving force; the driving shaft 231 and the driven shaft 232 are away from the motor One end of the second shaft 21 extends into the pump body 24 of pump B, and the two shafts are located at the outer periphery of one end of the inner cavity of the pump body 24 of pump B, and a mutually meshing spiral sleeve 234 is installed; unlike the A pump unit, the driving shaft 231 in the pump unit B 3 is coaxially installed with a stirring rod 233 at the end away from the motor 21. It should be noted that in other embodiments, the stirring rod 233 can also be installed on the driven shaft 232; in addition, the pump body 24 of pump B is also provided with a pump inlet 25 and a pump outlet 26 that are positioned vertically.

[0045] like Figure 8-9 The stirring rod 233 includes a rod blade 2331 and a rod handle 2332, wherein the rod blade is cut from a piece of steel plate, and the rod handle 2332 is made by turning a section of round steel, one end of which is riveted to the rod blade 2331, and the other end is provided with a thread and matched with the end thread of the driving shaft 231. The rotation direction of the thread is opposite to the rotation direction of the driving shaft 231 to prevent the driving shaft 231 from loosening when rotating; the stirring rod 233 is made into two parts of the rod blade 2331 and the rod handle 2332 by riveting, the rod blade 2331 is set in a thin sheet shape, and the corresponding part of the rod handle 2332 is grooved, and the rod blade 2331 is set in the groove and fixed with rivets. The biggest advantage of this method is that it minimizes the resistance to the material and stabilizes the force, thereby maximizing the flow rate; in addition, the processing and manufacturing are also convenient and fast, which is conducive to controlling the processing cost;

[0046] The stirring rod 233 extends into the tapered hole 15 opened on the side of the pump body 14 of pump A, and the gap S between the edge of the rod blade 2331 on the stirring rod 233 and the tapered surface of the tapered hole 15 is set to 0.5~3mm.

[0047] A recess 235 is provided at the pump outlet 26 of the B pump body 24. The recess 235 may be a circular or square recess 235 that cooperates with the corresponding positioning boss 16 on the A pump body 14. This cooperation is a transitional cooperation. The B pump body 24 and the A pump body 14 are positioned by the recess 235 and the boss 16 and are connected to each other by bolts.

[0048] Assume that there are two groups of materials, X and Y, that need to be mixed and transported. Once these two groups of materials come into contact, they will solidify. When the present invention is used for the mixed transport operation:

[0049] First, start pump unit A 2. When material X is detected flowing out of pump outlet 18, start pump unit B 3. The reason for setting the starting sequence in this way is that if pump unit B is started first, material Y will pass through the tapered hole 15 and gather near the left spiral sleeve 134 and the right spiral sleeve 135. After pump unit A 2 is started, materials X and Y will meet and cause solidification and jamming.

[0050] When pump unit A 2 and pump unit B 3 are started in sequence, the spiral sleeves in the two pump bodies rotate under the drive of the motor and the power transmission of the gear set;

[0051] Material X is fed in from the pump inlet 17 of pump unit A 2, and material Y is fed in from the pump inlet 25 of pump unit B 3. The two groups of materials meet and mix near the conical hole 15 where the two pumps meet, and the mixture is delivered through the pump outlet 18 of pump A, completing the mixed delivery of the two groups of materials. Because material Y is slowly injected into the meshing area of ​​the spiral sleeves on one side of pump A and mixed simultaneously during injection, a uniform mixture is achieved. To avoid local solidification at the mixing interface, two methods are adopted:

[0052] First, a stirring rod 233 is provided to break up solidified matter that may appear in the local intersection area of ​​the tapered hole 15, thereby preventing the tapered hole 15 from being blocked and causing obstruction of subsequent mixing and conveying;

[0053] Secondly, the special spiral surface on the spiral sleeve forms a sharp edge at the cycloid's end, which can cut off the local solidification that may occur during the conveying process.

[0054] The delivery ratio of materials X and Y can be controlled by adjusting the motor speed of pump unit A 2 and / or pump unit B 3;

[0055] When the mixed conveying task is completed, the B pump unit 3 should be shut down first and then the A pump unit 2; if the A pump unit 2 is shut down first, the material of the B pump unit 3 will continue to be fed in through the tapered hole 15, causing the material to aggregate and solidify, resulting in damage to the unit.

[0056] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A chemical combination screw pump, comprising a base (1), characterized in that: The base (1) is fixedly mounted with a pump unit A (2) and a pump unit B (3) connected to each other at a certain angle; The A pump unit (2) includes an A pump body (14), the inner cavity of which is provided with two mutually meshing spiral sleeves that rotate side by side, and the two spiral sleeves rotate synchronously in opposite directions; a tapered hole (15) that is connected to the B pump unit (3) is provided on the side of the A pump body (14) close to the B pump unit (3), and the opening position of the tapered hole (15) is located within the area of ​​the A pump body (14) where the two spiral sleeves mesh with each other; The B pump unit (3) includes a B pump body (24), the inner cavity of which is also provided with two mutually meshing spiral sleeves that rotate side by side, and a stirring rod (233) is coaxially fixed to the end of one of the spiral sleeves, and the stirring rod (233) extends into the tapered hole (15) on the side of the A pump body (14) to stir and cut the mixed material accumulated at this position; The spiral surface of the spiral sleeve is provided with the same sealing tooth shape, and the end interface shape is a cycloid. The cycloid is formed in the following process: when the pitch circle of one spiral sleeve is used as the moving circle and the pitch circle of the other spiral sleeve is used as the fixed circle for pure rolling motion, a point on the outer circumference of the moving circle is used as the cycloid point. The end of the spiral sleeve extends to a swing point on the cycloid and forms a cutting edge with a sharp angle. The swing point is the intersection of the cycloid and the outer circle of the spiral sleeve.

2. A chemical combination screw pump according to claim 1, characterized in that: A positioning boss (16) is coaxially provided on the outside of the tapered hole (15) of the pump body (14) of the pump A, and a recess (235) having a shape matching that of the positioning boss (16) is provided at the second pump outlet (26) of the pump body (24) of the pump B. When the pump unit A (2) and the pump unit B (3) are connected, the positioning boss (16) and the recess (235) are positioned in a transition fit manner, and finally the two units are fixed by bolts.

3. A chemical combination screw pump according to claim 1, characterized in that: The stirring rod (233) comprises a rod blade (2331) and a rod handle (2332); the rod handle (2332) is connected to the central axis of the corresponding spiral sleeve by a thread, and the direction of the thread rotation is opposite to the rotation direction of the spiral sleeve; the rod blade (2331) is configured as a thin sheet, and the corresponding end of the rod handle (2332) is grooved, and the rod blade (2331) is riveted in the groove.

4. A chemical combination screw pump according to claim 3, characterized in that: The gap between the outer edge of the rod leaf (2331) and the conical surface of the conical hole (15) is set at 0.5-3 mm.

5. A chemical combination screw pump according to claim 1, characterized in that: The transmission structure of the pump unit A (2) and the pump unit B (3) is the same, and the transmission structure includes a transmission box, in which a driving shaft and a driven shaft are installed for parallel rotation. The outer circumferences of the two shafts are sleeved with mutually meshing gears. One end of the driving shaft is connected to the motor through a coupling, and the ends of the two shafts away from the motor are coaxially fixed to two spiral sleeves.

6. A chemical combination screw pump according to claim 5, characterized in that: The ratio of the conveying amount of the two materials by the pump body A (14) and the pump body B (24) is achieved by adjusting the rotational speed of the motors of the two units.

7. A method for using the chemical combination screw pump according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step 1: First, start pump unit A (2) and feed material X from the inlet of pump unit A (2). After material X flows out from the outlet of the unit, start pump unit B (3) and feed material Y from the inlet of pump unit B (3); Step 2: Material X and material Y meet in the vicinity of the tapered hole (15) and mix with each other to obtain a mixture, which is then delivered from the outlet of pump unit A (2), completing the mixing and delivery of the two materials. During the mixing process, this step also includes the following steps: S21: When the two materials are mixed at the conical hole (15), local solidification may occur. The stirring rod (233) rotates synchronously with a spiral sleeve of the B pump unit (3), stirring the materials while cutting the solidified materials. S22: When the mixed material is conveyed to the end of the spiral sleeve, the cutting edge formed at the swing point of the cycloid at the end thereof will scrape and crush the solidified material during the mixing and conveying process.

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