Vacuum defoaming device for memory foam foaming raw material

Abstract

This utility model relates to the field of vacuum degassing technology, and more particularly to a vacuum degassing device for memory foam foam raw materials. The technical problem this utility model aims to solve is to provide a vacuum degassing device for memory foam foam raw materials that can achieve efficient, thorough, and stable degassing, ensuring the degassing effect and chemical stability of the material. A vacuum degassing device for memory foam foam raw materials includes a degassing tank, which is formed by a tank body and a tank lid sealed together. The tank lid has an inlet, and the bottom of the tank body has an outlet. Both the inlet and outlet are equipped with control valves. A stirring motor is installed on the tank lid, and the output shaft of the stirring motor is connected to a stirring rod installed inside the tank body. The degassing tank is also equipped with a pressure sensor for real-time monitoring of the pressure inside the tank. A vacuum port and an air injection port are also fixedly connected to the tank lid. This utility model achieves efficient, thorough, and stable degassing, ensuring the degassing effect and chemical stability of the material.

Description

Technical Field

[0001] This utility model relates to the field of vacuum degassing technology, and in particular to a vacuum degassing device for memory foam foaming raw materials. Background Technology

[0002] Memory foam, also known as slow rebound foam, is a high-performance polyurethane foam material widely used in medical protective gear, high-end bedding, and sports protective equipment due to its excellent pressure dispersion, shock absorption, and comfort. Its foaming raw materials are typically high-viscosity polyurethane prepolymers or similar polymer mixtures, which easily incorporate air and form numerous microbubbles during production. If these bubbles are not effectively removed during pretreatment, they will directly lead to serious defects in the final foamed product, such as uneven pore structure, excessively high closed-cell rate, product density fluctuations, and decreased mechanical properties, directly affecting the product's performance and yield. Currently, vacuum degassing devices are widely used in industrial production to degas high-viscosity materials. Common degassing equipment generally includes a sealed tank with stirring function, a vacuum system, and a heating unit. However, existing equipment still has significant limitations when processing special foamed materials such as memory foam. Traditional single-stage vacuum pump systems cannot balance pumping efficiency and ultimate vacuum, resulting in slow initial vacuuming speed and insufficient pumping capacity in the high vacuum stage, failing to effectively remove stable microbubbles inside the material. Therefore, there is an urgent need to develop a vacuum degassing device for memory foam foaming materials that can achieve efficient, thorough, and stable degassing, ensuring the degassing effect and chemical stability of the material. Utility Model Content

[0003] In order to overcome the shortcomings of existing vacuum degassing devices, such as difficulty in balancing pumping efficiency and ultimate vacuum, slow initial vacuuming speed, and insufficient pumping capacity in the high vacuum stage, this utility model aims to provide a vacuum degassing device for memory foam foaming raw materials that can achieve efficient, thorough, and stable degassing, ensuring the degassing effect and chemical stability of the material.

[0004] This utility model is achieved by the following specific technical means: A vacuum degassing device for memory foam raw materials includes a degassing tank, which is formed by a tank body and a tank cover sealed together. The tank cover has an inlet, and the bottom of the tank body has an outlet. Both the inlet and outlet are equipped with control valves. A stirring motor is installed on the tank cover, and the output shaft of the stirring motor is connected to a stirring rod installed inside the tank body. The degassing tank is also equipped with a pressure sensor for real-time monitoring of the internal pressure. A vacuum port and an air injection port are also fixedly connected to the tank cover. It also includes a multi-stage vacuum pump assembly and a heating device; the multi-stage vacuum pump assembly is connected to the vacuum port via a vacuum pipeline, and the multi-stage vacuum pump assembly includes a low-vacuum pump for initial vacuuming and a main vacuum pump for high vacuum stage; the vacuum pipeline is equipped with a vacuum valve assembly for switching the operation of the pump body, the vacuum valve assembly includes a main control valve located near the vacuum port, a low-vacuum pipeline valve connected to the inlet of the low-vacuum pump, and a main vacuum pipeline valve connected to the inlet of the main vacuum pump; the heating device is disposed on the outer wall of the tank body, including a jacket fitted on the outer wall of the tank body, the jacket and the outer wall of the tank body forming a sealed heating chamber, and the jacket is provided with a heat transfer medium inlet and a heat transfer medium outlet communicating with the heating chamber.

[0005] Furthermore, the bottom of the stirring rod is provided with an anchor-type stirring paddle or a frame-type stirring paddle suitable for stirring high-viscosity materials.

[0006] Furthermore, the stirring motor is a variable frequency motor, which can adjust the speed of the stirring rod to achieve slow stirring of the material during the degassing process.

[0007] Furthermore, the discharge port is located at the center of the bottom of the tank and is arranged at an angle downwards to facilitate the complete discharge of materials.

[0008] Furthermore, the low vacuum pump is a liquid ring vacuum pump or a screw vacuum pump, and the main vacuum pump is a Roots vacuum pump or a rotary vane vacuum pump.

[0009] Furthermore, the gas injection port is connected to an inert gas source via a pipeline; it is used to fill the degassing tank with inert gas to restore normal pressure.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves efficient, thorough and stable degassing, ensuring the degassing effect and chemical stability of the material. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0012] The labels in the attached diagram are as follows: 1-Tank body, 2-Tank cover, 3-Inlet, 4-Outlet, 5-Stirring motor, 6-Stirring rod, 7-Pressure sensor, 8-Vacuum port, 9-Vacuum tube, 10-Main control valve, 11-Low vacuum pump, 12-Main vacuum pump, 13-Low vacuum pipeline valve, 14-Main vacuum pipeline valve, 15-Gas injection port, 16-Heating jacket, 17-Liquid inlet, 18-Liquid outlet. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings: Example

[0014] A vacuum degassing device for memory foam foam raw materials, such as Figure 1 As shown, the device includes a degassing tank, which is formed by a tank body 1 and a tank cover 2 sealed together. The tank cover 2 is provided with a feed inlet 3, and the bottom of the tank body 1 is provided with a discharge outlet 4. Both the feed inlet 3 and the discharge outlet 4 are provided with control valves. A stirring motor 5 is installed on the tank cover 2, and the output shaft of the stirring motor 5 is connected to a stirring rod 6 provided inside the tank body 1. The degassing tank is also provided with a pressure sensor 7 for real-time monitoring of the pressure inside the tank. A vacuum port 8 and an air injection port 15 are also fixedly connected to the tank cover 2. It also includes a multi-stage vacuum pump assembly and a heating device; the multi-stage vacuum pump assembly is connected to the vacuum port 8 via a vacuum pipe 9, and the multi-stage vacuum pump assembly includes a low vacuum pump 11 for initial vacuuming and a main vacuum pump 12 for high vacuum stage; the vacuum pipe 9 is provided with a vacuum valve assembly for switching the operation of the pump body, the vacuum valve assembly includes a main control valve 10 located near the vacuum port 8, a low vacuum pipeline valve 13 connected to the inlet of the low vacuum pump 11, and a main vacuum pipeline valve 14 connected to the inlet of the main vacuum pump 12; the heating device is located on the outer wall of the tank body 1 and includes a jacket fitted on the outer wall of the tank body 1, the jacket and the outer wall of the tank body 1 forming a sealed heating chamber, the jacket is provided with a heat transfer medium inlet and a heat transfer medium outlet communicating with the heating chamber.

[0015] Working principle: The memory foam raw material to be processed is injected into the degassing tank through the feed port 3 on the tank cover 2. Then, the control valve of the feed port 3 is closed and the tank body 1 is sealed. The heating device is started, and a heat-conducting medium, such as hot water or hot oil, is introduced into the heating chamber of the jacket to uniformly heat the tank body 1 and the material inside, so as to keep it at a suitable degassing process temperature, reduce the viscosity of the material and promote the escape of bubbles.

[0016] Subsequently, a multi-stage vacuum pump group is started to perform vacuum degassing. This process is divided into two stages: First, the low vacuum pump 11 and the corresponding low vacuum pipeline valve 13 are turned on to perform preliminary vacuuming in the tank and quickly remove most of the gas; when the pressure sensor detects that the pressure in the tank has dropped to the low vacuum threshold, the vacuum valve group is switched, the low vacuum pipeline valve 13 is closed and the main vacuum pipeline valve 14 is opened, and the main vacuum pump 12 takes over to further pump the tank to a high vacuum state to completely remove the residual micro bubbles in the material; during this process, the frequency-driven stirring motor 5 drives the anchor or frame stirring paddle at the bottom to rotate slowly, which not only avoids material splashing, but also destroys the bubble structure and promotes bubble rise through gentle shearing action. At the same time, the design of the stirring paddle close to the tank wall helps to scrape off the material adhering to the wall, ensuring uniform heating and degassing.

[0017] After degassing is completed, the vacuum pump unit and heating device are turned off, and inert gas is injected into the tank through the gas injection port 15 to restore the pressure inside the tank to normal pressure, preventing material oxidation or secondary bubble generation. Finally, the control valve of the discharge port 4, which is inclined in the center of the bottom of the tank, is opened, and the material is completely discharged under the action of gravity and the stirring paddle. This device achieves efficient and thorough degassing of high-viscosity memory foam foaming raw materials through the synergistic effect of multi-stage vacuum system, controllable heating, frequency conversion stirring and inert gas protection, while ensuring process stability and product quality.

[0018] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0019] Although this disclosure has been described in detail with reference to exemplary embodiments, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of this disclosure.

Claims

1. A vacuum degassing device for memory foam foam raw materials, comprising a degassing tank, wherein the degassing tank is formed by a tank body (1) and a tank cover (2) sealed together; the tank cover (2) is provided with a feed inlet (3), and the bottom of the tank body (1) is provided with a discharge outlet (4), both the feed inlet (3) and the discharge outlet (4) are provided with control valves; a stirring motor (5) is installed on the tank cover (2), and the output shaft of the stirring motor (5) is connected to a stirring rod (6) provided inside the tank body (1); the degassing tank is also provided with a pressure sensor (7) for real-time monitoring of the pressure inside the tank; a vacuum port (8) and an air injection port (15) are also fixedly connected on the tank cover (2). characterized in that It also includes a multi-stage vacuum pump group and a heating device; the multi-stage vacuum pump group is connected to the vacuum port (8) through a vacuum pipe (9), the multi-stage vacuum pump group includes a low vacuum pump (11) for initial vacuuming and a main vacuum pump (12) for high vacuum stage; the vacuum pipe (9) is provided with a vacuum valve group for switching the operation of the pump body, the vacuum valve group includes a main control valve (10) located near the vacuum port (8), a low vacuum pipeline valve (13) connected to the inlet of the low vacuum pump (11), and a main vacuum pipeline valve (14) connected to the inlet of the main vacuum pump (12); the heating device is located on the outer wall of the tank (1), including a jacket sleeved on the outer wall of the tank (1), the jacket and the outer wall of the tank (1) form a sealed heating chamber, and the jacket is provided with a heat transfer medium inlet and a heat transfer medium outlet communicating with the heating chamber.

2. The vacuum degassing device for memory foam foaming raw materials according to claim 1, characterized in that, The bottom of the stirring rod (6) is provided with an anchor-type stirring paddle or a frame-type stirring paddle suitable for stirring high-viscosity materials.

3. The vacuum degassing device for memory foam foaming raw materials according to claim 1, characterized in that, The stirring motor (5) is a variable frequency motor.

4. The vacuum degassing device for memory foam foaming raw materials according to claim 1, characterized in that, The discharge port (4) is located at the center of the bottom of the tank (1) and is arranged at an angle downwards.

5. The vacuum degassing device for memory foam foaming raw materials according to claim 1, characterized in that, The low vacuum pump (11) is a liquid ring vacuum pump or a screw vacuum pump, and the main vacuum pump (12) is a Roots vacuum pump or a rotary vane vacuum pump.

6. The vacuum degassing device for memory foam foaming raw materials according to claim 1, characterized in that, The gas injection port (15) is connected to an inert gas source via a pipeline.

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