Mixing kettle for liquid pesticide preparation
By combining a liquid circulation mixing vessel with an inner liner and baffle structure, the problems of long mixing time and equipment instability in suspension mixing vessels with high viscosity suspensions are solved, achieving efficient and uniform mixing and equipment stability, and is suitable for mixing liquid pesticide formulations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-17
AI Technical Summary
Existing suspension mixing tanks suffer from long mixing times and poor equipment stability when mixing high-viscosity suspensions, making it difficult to achieve uniform mixing.
It adopts a liquid circulation mixing method, combined with the structure of inner tank, baffle and guide plate, to improve mixing efficiency by liquid circulation and baffle turbulence, and to regulate temperature by hot or cold medium to avoid high speed stirring.
It achieves uniform mixing of high-viscosity suspending agents, shortens mixing time, improves equipment stability, and avoids instability caused by high-speed stirring.
Smart Images
Figure CN223995943U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of chemical equipment, specifically to a mixing vessel for liquid pesticide formulations. Background Technology
[0002] Liquid pesticide formulations refer to formulations in which the active ingredients of pesticides are dissolved or dispersed in a liquid medium to form a homogeneous and stable liquid. Based on the different dispersion systems, liquid pesticide formulations are mainly classified into solutions, emulsifiable concentrates, water-in-oil emulsions, suspensions, and microemulsions.
[0003] Suspension concentrates effectively disperse insoluble or poorly soluble pharmaceutical raw materials into an aqueous liquid, forming a stable suspension system. Suspension concentrates have advantages such as fine particle size, easy adhesion to crop surfaces, and improved efficacy. Manufacturer-produced suspension concentrates are typically 30%–50% concentrated, and users further dilute them according to different crops and pests / diseases.
[0004] In the preparation of suspensions, grinding can lead to uneven particle size, causing particles to easily aggregate and settle, affecting uniformity and stability. Existing suspension mixing vessels typically employ paddle agitation. After adding solids and solvent to the mixing vessel, vigorous stirring is used to uniformly disperse the solids in the solvent. However, due to the high concentration of suspensions, the suspension system usually contains thickeners, resulting in high viscosity. Furthermore, the mixing vessel is typically large, and the agitator can only stir a localized area; high rotation speeds are required to achieve uniform mixing. This leads to poor equipment stability during mixing and necessitates a prolonged mixing time. Utility Model Content
[0005] To address the problems of long mixing time and poor equipment stability when mixing high-viscosity suspensions in existing suspension mixing kettles, this invention provides a mixing kettle for liquid pesticide formulations to solve the above problems.
[0006] The technical solution of this utility model is as follows:
[0007] A mixing vessel for liquid pesticide formulation includes a mixing vessel body; a feed inlet is provided at the top of the mixing vessel body; an inner liner is provided inside the mixing vessel body, and the inner liner is connected to the mixing vessel body via a connecting rod; multiple baffles are provided inside the inner liner, with adjacent baffles arranged alternately; an outlet is provided at the bottom of the inner liner, and a discharge pipe is provided at the outlet; the discharge pipe passes through the mixing vessel body and is connected to an external circulating pump; a return pipe is provided at the bottom of the mixing vessel body, and the return pipe is connected to the circulating pump; a discharge valve is also provided on the return pipe.
[0008] Furthermore, a guide plate is provided above the inner liner; the guide plate is fixed to the inner wall of the mixing vessel body; the center of the guide plate has a through hole. When feeding material into the mixing vessel, it guides the material into the inner liner; simultaneously, the suspension circulating in the mixing vessel moves upwards from the space between the inner liner and the mixing vessel body, and upon reaching the guide plate, the liquid is obstructed and directly enters the inner liner. This both guides the liquid and prevents the liquid from impacting the top of the vessel when it is full.
[0009] Furthermore, a sight glass is provided on the discharge pipe. The sight glass facilitates observation of the state of the suspension during mixing.
[0010] Furthermore, the baffles are set to 2 to 5. Multiple baffles can turbulent the flow and improve the efficiency of solid-liquid mixing. However, the number of baffles should not be excessive to prevent hydraulic pressure rise caused by the narrowing of the liquid flow.
[0011] Furthermore, the mixing vessel body is equipped with a jacket for introducing a heating medium for heating or a cooling medium for cooling. For some high-viscosity suspensions, mixing at room temperature would reduce the mixing effect due to the increased viscosity; therefore, heating would reduce the viscosity and improve the mixing effect. For some heat-sensitive active pharmaceutical ingredients (APIs), the continuous impact of the suspension against the vessel wall during mixing causes the liquid temperature to rise. Introducing a cooling medium can lower the temperature of the suspension and prevent the API from deteriorating.
[0012] Furthermore, the two ends of the connecting rod are welded to the inner liner and the mixing vessel body, respectively, and the connecting rod is respectively set at the upper and lower parts of the inner liner to increase the stability of the inner liner in the mixing vessel.
[0013] The working principle of this invention is as follows: During suspension preparation, liquid is added to the mixing vessel through the inlet. After the pump is turned on, circulation begins. The circulation direction is as follows: the liquid exits from the outlet at the bottom of the inner liner, then enters the mixing vessel from the bottom after passing through the pump. The liquid moves upwards along the gap between the inner liner and the mixing vessel wall. When the liquid overflows the top of the inner liner, it re-enters the inner liner. After the liquid begins circulating, solid raw materials are added, and mixing begins. Once the suspension is uniformly mixed, the discharge valve at the bottom of the mixing vessel is opened. The suspension in the inner liner is discharged through the pump, while the suspension outside the inner liner is naturally discharged from the mixing vessel by gravity.
[0014] The beneficial effects of this utility model are as follows:
[0015] This invention replaces the original impeller-type mixing method with a liquid circulation mixing method. Firstly, it solves the problem of poor equipment stability during mixing, eliminating the need for high-speed stirring. Secondly, for high-viscosity suspending agents, this invention enables forced mixing, ensuring uniformity even with high-concentration suspending agents, and significantly shortening the mixing time. Attached Figure Description
[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0018] Figure 2 This is a schematic diagram of the structure of the guide plate in this utility model.
[0019] In the figure, 1-mixing vessel body, 2-inner liner, 3-baffle, 4-connecting rod, 5-guide plate, 6-circulating pump, 7-outlet, 8-sight glass, 9-feed inlet, 10-discharge pipe, 11-return pipe, 12-discharge valve. Detailed Implementation
[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.
[0021] Example 1
[0022] A mixing vessel for liquid pesticide formulation includes a mixing vessel body 1; the mixing vessel body 1 has a feed inlet 9 at the top; the mixing vessel body 1 has an inner liner 2 inside, which is connected to the mixing vessel body 1 via a connecting rod 4; the inner liner 2 has two baffles 3 inside, with adjacent baffles 3 arranged alternately; the bottom of the inner liner 2 has an outlet 7, and the outlet 7 has a discharge pipe 10; the discharge pipe 10 passes through the mixing vessel body 1 and is connected to an external circulating pump 6; the bottom of the mixing vessel body 1 has a return pipe 11, which is connected to the circulating pump 6; the return pipe 11 is also equipped with a discharge valve 12.
[0023] Example 2
[0024] A mixing vessel for liquid pesticide formulation includes a mixing vessel body 1; the top of the mixing vessel body 1 is provided with a feed inlet 9; the mixing vessel body 1 is provided with an inner liner 2, which is connected to the mixing vessel body 1 via a connecting rod 4; the two ends of the connecting rod 4 are respectively welded to the inner liner 2 and the mixing vessel body 1, and the connecting rod 4 is respectively located at the upper and lower parts of the inner liner 2; the inner liner 2 is provided with two baffles 3 inside, with adjacent baffles 3 staggered; a guide plate 5 is provided above the inner liner 2; the guide plate... 5 is fixed on the inner wall of the mixing vessel body 1; the guide plate 5 has a through hole in the center; the bottom of the inner liner 2 has an outlet 7, and the outlet 7 has a discharge pipe 10; the discharge pipe 10 passes through the mixing vessel body 1 and is connected to the external circulating pump 6; the discharge pipe 10 is equipped with a sight glass 8; the bottom of the mixing vessel body 1 is equipped with a return pipe 11, which is connected to the circulating pump 6; the return pipe 11 is also equipped with a discharge valve 12; the outside of the mixing vessel body 1 is equipped with a jacket for introducing heat medium for heating or cold medium for cooling.
[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A mixing kettle of liquid pesticide preparation, comprising a mixing kettle body; a feeding port is arranged at the top of the mixing kettle body; characterized in that, The mixing kettle body is internally provided with an inner container, which is connected with the mixing kettle body through a connecting rod; the inner container is internally provided with a plurality of baffles, which are staggered between adjacent baffles; the bottom of the inner container is provided with an outlet, which is provided with a discharge pipe; the discharge pipe penetrates through the mixing kettle body and is connected with an external circulating pump; the bottom of the mixing kettle body is provided with a return pipe, which is connected with the circulating pump; the return pipe is further provided with a discharge valve.
2. The mixing kettle for liquid agricultural chemical preparation according to claim 1, wherein The inner container is provided above with a flow guide plate; the flow guide plate is fixed on the inner wall of the mixing kettle body; the center of the flow guide plate is provided with a through hole.
3. The mixing kettle for liquid agricultural chemical preparation according to claim 1, wherein The discharge pipe is provided with a sight glass.
4. The mixing kettle for liquid agricultural chemical preparation according to claim 1, wherein The baffles are provided in two to five.
5. The mixing kettle for liquid agricultural chemical preparation according to claim 1, wherein The mixing kettle body is externally provided with a jacket.
6. The mixing kettle for liquid agricultural chemical preparation according to claim 1, wherein The two ends of the connecting rod are respectively welded on the inner container and the mixing kettle body, and the connecting rod is respectively arranged on the upper part and the lower part of the inner container.