Low pressure vacuum polyether premix kettle

Abstract

The utility model discloses a kind of low-pressure vacuum polyether premixing kettle, including kettle body, driving motor, stirring assembly, vacuum system and multiple storage tanks;The utility model adopts magnetic coupling driving, realizes complete static seal, fundamentally eliminates leakage, ensures high vacuum environment stability, by vacuum suction powder material and volatile liquid material, can effectively avoid dust raising, simultaneously avoid additive volatilization to air, and by valve sequence control, realized the semi-automation or automation of feeding process, reduced artificial error, improved the consistency between batches, the configuration of "Roots pump+liquid ring pump" parallel unit and pre-condenser, not only fast pumping speed, high vacuum, but also can effectively recover solvent, protect equipment, cooperate with jacket and mold temperature controller accurate temperature control, whole system realizes efficient, reliable, clean automation production, significantly improve product quality and operation safety.

Description

Technical Field

[0001] This utility model relates to the field of chemical mixing equipment technology, and in particular to a low-pressure vacuum polyether premixing kettle. Background Technology

[0002] The polyurethane and other industries have long faced a series of process pain points in the premixing section of polyether polyols: traditional mechanical seals are prone to leakage under high vacuum conditions, which can damage the vacuum environment and introduce moisture and air, resulting in unstable product quality; dust flies when powder is fed, which can cause material loss and endanger occupational health; volatile components (such as foaming agents) are lost when fed under normal pressure, which not only affects the accuracy of the formulation but also brings safety and environmental risks. Utility Model Content

[0003] The purpose of this invention is to provide a low-pressure vacuum polyether premixing kettle that integrates absolute sealing, environmentally friendly feeding, and intelligent control. It eliminates leakage sources through magnetic coupling transmission, constructs a combined stirring and precise temperature control system to ensure mixing quality, and innovatively integrates a vacuum feeding and solvent recovery system, thereby achieving high efficiency, cleanliness, and automation in the production process, meeting the stringent requirements of modern fine chemicals for product quality, production safety, and environmental protection standards.

[0004] The technical solution of this utility model is as follows:

[0005] A low-pressure vacuum polyether premixing vessel includes a vessel body, a drive motor, a stirring assembly, a vacuum system, and multiple storage tanks. The vessel body has an inlet and a suction pipe at the top, and an outlet pipe at the bottom. The suction pipe is connected to different storage tanks via a multi-way valve. A heat exchange jacket is provided on the peripheral wall of the vessel body, and the inlet and outlet of the heat exchange jacket are connected to a combined heating and cooling mold temperature controller. A magnetic coupler is installed at the top of the vessel body. The inner magnetic rotor of the magnetic coupler is connected to the stirring assembly, and the outer magnetic rotor is connected to the drive motor. The vacuum system includes a suction pipe, a condenser, and a negative pressure pump assembly. The negative pressure pump assembly is connected to the top of the vessel body via the suction pipe. A condenser is connected in series before the inlet of the negative pressure pump assembly, and a gas-liquid separator is installed on the outlet side of the condenser via the suction pipe.

[0006] Furthermore, a shut-off valve is connected in series on the side of the suction pipe closest to the vessel body, and a check valve is installed on the side of the suction pipe closest to the vessel body.

[0007] Furthermore, the mixing assembly includes a rotating shaft, a propeller-type mixer mounted at the bottom of the rotating shaft, and a serrated disc turbine-type mixer or an impeller-type mixer mounted at the top.

[0008] Furthermore, the back pump of the negative pressure pump set is a liquid ring pump, and the main pump is a Roots pump, which are installed in parallel.

[0009] Furthermore, one of the inlets of the multi-way valve is connected to an intake filter for pressure relief.

[0010] The advantages of this utility model are:

[0011] This invention employs magnetic coupling drive to achieve complete static sealing, fundamentally eliminating leakage and ensuring a stable high-vacuum environment. By vacuum-suctioning powdered materials and volatile liquid materials, dust generation is effectively avoided, and additives are prevented from evaporating into the air. Furthermore, through valve sequence control, the feeding process is semi-automated or automated, reducing human error and improving batch-to-batch consistency. The configuration of the "Roots pump + liquid ring pump" parallel unit with a pre-condenser not only provides fast pumping speed and high vacuum but also effectively recovers solvents, protecting the equipment. Combined with precise temperature control via a jacket and mold temperature controller, the entire system achieves efficient, reliable, and clean automated production, significantly improving product quality and operational safety. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a three-dimensional schematic diagram of the vessel body;

[0014] Figure 3 This is a cross-sectional view of the vessel body.

[0015] In the diagram: 1-Bottle body, 11-Inlet, 12-Outlet pipe, 13-Heat exchange jacket, 14-Suction pipe, 141-Check valve, 15-Suction pipe, 151-Stop valve, 2-Drive motor, 21-Magnetic coupler, 3-Stirring assembly, 31-Rotating shaft, 32-Propeller agitator, 33-Serrated disc turbine agitator, 4-Multi-port valve, 41-Air inlet filter, 5-Storage tank, 6-Condenser, 7-Gas-water separator, 8-Negative pressure pump set, 9-Integrated heating and cooling mold temperature controller. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] like Figure 1-3 As shown:

[0018] A low-pressure vacuum polyether premixing vessel includes a vessel body 1, a drive motor 2, a stirring assembly 3, a vacuum system, and multiple storage tanks 5. The top of the vessel body 1 is provided with a feed inlet 11 and a suction pipe 15, and the bottom is provided with a discharge pipe 12. The suction pipe 15 is connected to different storage tanks 5 through a multi-way switching valve 4. The peripheral wall of the vessel body 1 is provided with a heat exchange jacket 13, and the inlet and outlet of the heat exchange jacket 13 are connected to a cold and hot integrated mold temperature controller 9. A magnetic coupler 21 is installed on the top of the vessel body 1. The inner magnetic rotor of the magnetic coupler 21 is connected to the stirring assembly 3, and the outer magnetic rotor is connected to the drive motor 2.

[0019] In operation, the liquid polyether main material and some additives are added through the feed port 11. The feed port 11 adopts an existing suction design, which automatically closes under negative pressure. The greater the pressure difference, the tighter the seal. After the main material is added, the cover of the feed port 11 is closed, and then a vacuum is drawn. After a certain vacuum is reached, the multi-way switching valve 4 opens in sequence to suck up the powdered material and easily volatile liquid material (such as foaming agent) in the storage tank 5. The powder is sucked up first, and then the liquid is sucked up. This can effectively avoid dust and prevent the additives from evaporating into the air. Moreover, the feeding process is semi-automated or automated through valve sequence control, which reduces human error and improves batch consistency.

[0020] In this invention, the drive motor 2 and the stirring assembly 3 are driven by a magnetic coupler 21. Since the two sides of the magnetic coupler 21 do not need to be connected and there is an isolation sleeve between them, it is more suitable for vacuum environments than traditional shaft seals. It completely eliminates the traditional mechanical shaft seal and achieves zero dynamic sealing points. This means that during stirring, the risk of leakage caused by shaft seal wear and aging is completely eliminated. It is particularly suitable for long-term stable operation under high vacuum conditions, ensuring the durability of the vacuum degree inside the vessel, and fundamentally eliminating the problem of material oxidation or excessive moisture caused by air leakage.

[0021] The vacuum system includes a suction pipe 14, a condenser 6, and a negative pressure pump group 8. The negative pressure pump group 8 is connected to the top of the vessel body 1 through the suction pipe 14. The condenser 6 is connected in series before the inlet of the negative pressure pump group 8. A steam-water separator 7 is installed on the outlet side of the condenser 6 through the suction pipe 14.

[0022] The back pump of the negative pressure pump group 8 is a liquid ring pump, which is responsible for pumping from atmospheric pressure to a certain vacuum level. The main pump is a Roots pump, which works efficiently under the pre-vacuum created by the back pump and quickly reaches a high vacuum level. The two are installed in parallel, which not only makes the pumping speed fast and the ultimate vacuum high, but also effectively extracts condensable gases (such as water vapor and easily vaporized liquid additives). In order to effectively protect the negative pressure pump group 8, a condenser 6 is installed before the inlet of the negative pressure pump group 8 to condense and recover the extracted solvent vapor (such as foaming agent) and water vapor, protect the vacuum pump and reduce environmental pollution.

[0023] After feeding is complete, continue to evacuate to the working pressure, and then close all valves. In order to protect the pipeline, a shut-off valve 151 is connected in series on the side of the suction pipe 15 near the vessel body 1, and a check valve 141 is installed on the side of the suction pipe 14 near the vessel body 1 (although the negative pressure pump group 8 has its own check valve, this can protect the pipeline of the condenser 6 and avoid it being in a long-term negative pressure state when not in operation).

[0024] After being heated to a predetermined temperature through the heat exchange jacket 13, the mixture is stirred. The inlet and outlet of the heat exchange jacket 13 are connected to the integrated heating and cooling mold temperature controller 9, enabling precise heating and cooling control. The stirring assembly 3 includes a rotating shaft 31, with a propeller-type stirrer 32 installed at the bottom of the shaft 31 to provide strong axial flow, pumping the material from the bottom upwards to prevent sedimentation. A serrated disc turbine-type stirrer 33 or an impeller-type stirrer is installed at the top to provide high shear force, breaking up solid particles and droplets to achieve micro-mixing. After mixing, pressure needs to be released. One inlet of the multi-port switching valve 4 can be connected to the air inlet filter head 41 for pressure release, or a separate pressure release valve can be installed at the top of the vessel body 1. The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A low-pressure vacuum polyether premixing vessel, characterized in that: The system includes a vessel body, a drive motor, a stirring assembly, a vacuum system, and multiple storage tanks. The vessel body has an inlet and a suction pipe at the top, and an outlet pipe at the bottom. The suction pipe is connected to different storage tanks via a multi-way valve. A heat exchange jacket is provided on the peripheral wall of the vessel body, and the inlet and outlet of the heat exchange jacket are connected to a combined heating and cooling mold temperature controller. A magnetic coupler is installed at the top of the vessel body. The inner magnetic rotor of the magnetic coupler is connected to the stirring assembly, and the outer magnetic rotor is connected to the drive motor. The vacuum system includes a suction pipe, a condenser, and a negative pressure pump assembly. The negative pressure pump assembly is connected to the top of the vessel body via the suction pipe. A condenser is connected in series before the inlet of the negative pressure pump assembly, and a gas-liquid separator is installed on the outlet side of the condenser via the suction pipe.

2. The low-pressure vacuum polyether premixing reactor according to claim 1, characterized in that: A shut-off valve is connected in series on the side of the suction pipe closest to the vessel body, and a check valve is installed on the side of the suction pipe closest to the vessel body.

3. The low-pressure vacuum polyether premixing reactor according to claim 1, characterized in that: The mixing assembly includes a rotating shaft, a propeller-type mixer mounted at the bottom of the rotating shaft, and a serrated disc turbine-type mixer or an impeller-type mixer mounted at the top.

4. The low-pressure vacuum polyether premixing reactor according to claim 1, characterized in that: The back pump of the negative pressure pump set is a liquid ring pump, and the main pump is a Roots pump, which are installed in parallel.

5. The low-pressure vacuum polyether premixing reactor according to claim 1, characterized in that: One of the inlets of the multi-port switching valve is connected to an intake filter for pressure relief.

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