Gas mixing device for modified atmosphere packaging machines

Abstract

The utility model provides a kind of gas mixing device of gas modification packaging machine, it is related to gas modification packaging machine technical field, including three independent air inlet pipeline, first gas mixing tank, second gas mixing tank and control panel;Air inlet pipeline is sequentially connected electronic pressure gauge, pressure reducing valve, solenoid valve, speed regulating valve and electronic flowmeter along gas flow direction;Air inlet pipeline outlet is communicated first gas mixing tank;First gas mixing tank outlet is communicated second gas mixing tank;Second gas mixing tank outlet is provided with output solenoid valve and output speed regulating valve;Electronic pressure gauge, pressure reducing valve, solenoid valve, speed regulating valve, electronic flowmeter, output solenoid valve and output speed regulating valve are electrically connected with control panel.The utility model provides a kind of gas mixing device of gas modification packaging machine, solve the problem of low proportion accuracy of gas mixture component in prior art gas modification packaging machine, and the component proportion accuracy of output gas can be improved.

Description

Technical Field

[0001] This utility model relates to the field of modified atmosphere packaging machine technology, specifically to the gas mixing device of a modified atmosphere packaging machine. Background Technology

[0002] In the field of food processing and preservation, modified atmosphere packaging technology, by filling the packaging with a composite preservative gas composed of nitrogen, oxygen and carbon dioxide, adjusts the gas environment ratio inside the packaging, which can effectively inhibit the growth of microorganisms and slow down the metabolic rate of food, thereby extending the shelf life of food.

[0003] The mixing precision and output stability of the composite preservative gases directly determine the preservation effect of modified atmosphere packaging.

[0004] Existing modified atmosphere packaging (MAP) machines are generally equipped with a preservative gas mixing device suitable for packaging filling, as disclosed in Chinese Patent Application No. 201920987004.1. This device has a mixing and storage device, and nitrogen, oxygen, and carbon dioxide are mixed by being connected to this single mixing and storage device through their respective inlet pipe assemblies. However, due to nitrogen (density 1.25 kg / m³)... 3 ), oxygen (1.43 kg / m³) 3 ), carbon dioxide (1.98 kg / m³) 3 The density differences are significant. In a single mixing tank, the gas is prone to stratification due to gravity. The denser carbon dioxide tends to deposit at the bottom of the tank, while the less dense nitrogen tends to accumulate at the top, forming a stratification phenomenon of nitrogen on top and carbon on the bottom. Furthermore, a single mixing tank can only rely on natural gas diffusion and intake impact to achieve mixing. When multiple gases enter the tank at a high flow rate, some gases are not fully mixed and are directly discharged from the outlet, resulting in a deviation of ±5% in the component ratio of the output gas. Utility Model Content

[0005] To address the aforementioned technical problems, the gas mixing device for the modified atmosphere packaging machine provided by this utility model can improve the accuracy of the component ratio of the output gas.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The gas mixing device of the modified atmosphere packaging machine provided by this utility model includes three independent air inlet pipes, a first mixing tank, a second mixing tank, and a control board. The air inlet pipes are sequentially connected in series along the gas flow direction, including an electronic pressure gauge, a pressure reducing valve, a solenoid valve, a speed regulating valve, and an electronic flow meter. The outlet of the air inlet pipe is connected to the first mixing tank. The outlet of the first mixing tank is connected to the second mixing tank. A mixing electronic pressure gauge is installed inside the second mixing tank. An output solenoid valve and an output speed regulating valve are installed at the outlet of the second mixing tank. The electronic pressure gauge, the pressure reducing valve, the solenoid valve, the speed regulating valve, the electronic flow meter, the output solenoid valve, and the output speed regulating valve are all electrically connected to the control board.

[0007] The gas mixing device of the modified atmosphere packaging machine provided by this utility model preferably has a spiral guide pipe fixed on the top inner wall of the second mixing tank; the input end of the spiral guide pipe extends to the top of the second mixing tank and communicates with the gas outlet end at the bottom of the first mixing tank; the output end of the spiral guide pipe extends to the middle region of the second mixing tank; the gas outlet end of the second mixing tank is located on the bottom side wall; the gas outlet end of the second mixing tank is provided with the output solenoid valve and the output speed regulating valve.

[0008] The gas mixing device of the modified atmosphere packaging machine provided by this utility model preferably has a spiral angle of 30° in the spiral guide tube.

[0009] This utility model provides a gas mixing device for a modified atmosphere packaging (MAP) machine, relating to the technical field of MAP machines. It includes three independent inlet pipes, a first mixing tank, a second mixing tank, and a control board. The inlet pipes are sequentially connected in series along the gas flow direction, comprising an electronic pressure gauge, a pressure reducing valve, a solenoid valve, a speed regulating valve, and an electronic flow meter. The outlet of the inlet pipes connects to the first mixing tank; the outlet of the first mixing tank connects to the second mixing tank; a mixing electronic pressure gauge is installed inside the second mixing tank; an output solenoid valve and an output speed regulating valve are installed at the outlet of the second mixing tank; the electronic pressure gauge, the pressure reducing valve, the solenoid valve, the speed regulating valve, the electronic flow meter, the output solenoid valve, and the output speed regulating valve are all electrically connected to the control board. The gas mixing device for a MAP machine provided by this utility model solves the problem of low accuracy in the component ratio of mixed gases in existing MAP machines, and can improve the accuracy of the component ratio of the output gas. Attached Figure Description

[0010] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0011] Figure 1 This is a schematic diagram of the pipeline connection structure of the gas mixing device of the modified atmosphere packaging machine provided in Embodiment 1 of this utility model.

[0012] Figure 2 This is a schematic diagram of the first and second gas mixing tanks of the gas mixing device of the modified atmosphere packaging machine provided in Embodiment 1 of this utility model.

[0013] Figure 3 This is a schematic diagram of the circuit connection of the gas mixing device of the modified atmosphere packaging machine provided in Embodiment 1 of this utility model. Detailed Implementation

[0014] Example 1: The gas mixing device for the modified atmosphere packaging machine provided in Embodiment 1 of this utility model, such as Figures 1 to 3 As shown, the system includes three independent intake pipes, a first mixing tank 2, a second mixing tank 3, and a control board 4. The intake pipes are connected in series along the gas flow direction, consisting of an electronic pressure gauge 11, a pressure reducing valve 12, a solenoid valve 13, a speed regulating valve 14, and an electronic flow meter 15. The intake pipe outlet is connected to the first mixing tank 2; the outlet of the first mixing tank 2 is connected to the second mixing tank 3; the second mixing tank 3 contains a mixing electronic pressure gauge 33; the outlet of the second mixing tank 3 contains an output solenoid valve 31 and an output speed regulating valve 32; the electronic pressure gauge 11, pressure reducing valve 12, solenoid valve 13, speed regulating valve 14, electronic flow meter 15, output solenoid valve 31, and output speed regulating valve 32 are all electrically connected to the control board 4.

[0015] In the modified atmosphere packaging machine provided in Embodiment 1 of this utility model, the gas mixing device allows nitrogen, oxygen, and carbon dioxide to enter their respective independent inlet pipes during operation. An electronic pressure gauge 11 monitors the initial pressure of each gas (gas cylinder output pressure 15 MPa) in real time and feeds the data back to the control board 4. The pressure reducing valve 12, according to the instructions of the control board 4, reduces the high-pressure gas to the working pressure (0.5-0.8 MPa) to ensure the safe operation of downstream components. The control board 4 controls the solenoid valve 13, adjusting the gas flow through its opening and closing time to achieve pulsed gas supply. The speed regulating valve 14, in conjunction with the electronic flow meter 15, adjusts the gas flow rate in real time. The electronic flow meter 15 feeds back the actual flow data to the control board 4; the three gas streams after regulation converge into the first mixing tank 2, where they are initially mixed through the impact of the gas's own kinetic energy and the turbulence effect; the initially mixed gas enters the second mixing tank 3, where it undergoes secondary static mixing using the space inside the second mixing tank 3 to eliminate local concentration deviations. At the same time, the mixing electronic pressure gauge 33 (electrically connected to the control board 4) inside the second mixing tank 3 monitors the pressure inside the tank in real time (maintaining 0.6MPa±0.02MPa), and the data is fed back to the control board 4. If the pressure is abnormal, the upstream pressure reducing valve 12 is adjusted to adjust the three gas streams proportionally. Compared to existing technologies that use only one mixing tank 3, the first mixing tank 2 in this embodiment can focus on preliminary mixing, while the second mixing tank 3 is used as a buffer tank to stabilize the pressure. This facilitates pressure fluctuation control of the output mixed gas without having to limit the fluctuation intensity of the gas in a single mixing tank in order to control the output pressure stability. Furthermore, since this embodiment includes a second mixing tank 3, the gas entering the second mixing tank 3 must first pass through the connecting pipeline between the first mixing tank 2 and the second mixing tank 3. Therefore, when the gas flows out of the first mixing tank 2 and into the second mixing tank 3, it will inevitably come into contact with other gases. This avoids the situation where the gas is discharged directly without being mixed after entering the mixing tank, thereby improving the accuracy of the component ratio of the output gas.

[0016] The gas mixing device for the modified atmosphere packaging machine provided in Embodiment 1 of this utility model solves the problem of low accuracy of the component ratio of the mixed gas in the prior art, and can improve the component ratio accuracy of the output gas.

[0017] In this embodiment, a spiral guide pipe 5 is fixed to the top inner wall of the second mixing tank 3; the input end of the spiral guide pipe 5 extends to the top of the second mixing tank 3 and communicates with the outlet end of the bottom of the first mixing tank 2; the output end of the spiral guide pipe 5 extends to the middle region of the second mixing tank 3; the outlet end of the second mixing tank 3 is located on the bottom side wall; the outlet end of the second mixing tank 3 is equipped with an output solenoid valve 31 and an output speed regulating valve 32. The output solenoid valve 31 and the output speed regulating valve 32 are electrically connected to the control board 4 respectively. The spiral structure of the spiral guide pipe 5 forces the initial mixed gas output from the first mixing tank 2 to form a rotating airflow in the pipe, which shears and mixes with the original gas in the second mixing tank 3, breaking the secondary stratification that may be formed in the second mixing tank 3 due to density differences, and avoiding the short-circuit problem of gas being discharged directly from the outlet without being mixed as soon as it enters the tank.

[0018] In this embodiment, the spiral angle of the spiral guide tube 5 is 30°. If the angle is too small, the airflow rotation intensity is insufficient, and the gas only flows along a slight spiral trajectory, which cannot form enough shear force to break the density stratification. If the angle is too large, the rotation is too violent. Although the airflow can form strong turbulent vortices in the tube, the pressure loss makes the first mixing tank need to increase the output pressure. The 30° spiral guide tube 5 in this embodiment is a preferred structure.

[0019] In summary, this utility model provides a gas mixing device for a modified atmosphere packaging (MAP) machine, relating to the technical field of MAP machines. It includes three independent inlet pipes, a first mixing tank, a second mixing tank, and a control board. The inlet pipes are sequentially connected in series along the gas flow direction, comprising an electronic pressure gauge, a pressure reducing valve, a solenoid valve, a speed regulating valve, and an electronic flow meter. The outlet of the inlet pipes connects to the first mixing tank; the outlet of the first mixing tank connects to the second mixing tank; a mixing electronic pressure gauge is installed inside the second mixing tank; an output solenoid valve and an output speed regulating valve are installed at the outlet of the second mixing tank; the electronic pressure gauge, the pressure reducing valve, the solenoid valve, the speed regulating valve, the electronic flow meter, the output solenoid valve, and the output speed regulating valve are all electrically connected to the control board. The gas mixing device for a MAP machine provided by this utility model solves the problem of low accuracy in the proportion of mixed gas components in existing MAP machines, and can improve the accuracy of the component proportions of the output gas.

[0020] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A gas mixing device for a modified atmosphere packaging machine, characterized in that, It includes three independent intake pipes, a first mixing tank, a second mixing tank, and a control board; The intake pipeline is equipped with an electronic pressure gauge, a pressure reducing valve, a solenoid valve, a speed regulating valve, and an electronic flow meter connected in series along the gas flow direction. The outlet of the air intake pipe is connected to the first mixing tank; the outlet of the first mixing tank is connected to the second mixing tank; a mixing electronic pressure gauge is installed inside the second mixing tank; an output solenoid valve and an output speed control valve are installed at the outlet of the second mixing tank. The electronic pressure gauge, the pressure reducing valve, the solenoid valve, the speed regulating valve, the electronic flow meter, the output solenoid valve, and the output speed regulating valve are all electrically connected to the control board.

2. The gas mixing device of the modified atmosphere packaging machine as described in claim 1, characterized in that, A spiral drain pipe is fixed to the top inner wall of the second mixing tank; the input end of the spiral drain pipe extends to the top of the second mixing tank and communicates with the outlet end at the bottom of the first mixing tank. The output end of the spiral drain tube extends to the middle region of the second mixing tank; The outlet of the second mixing tank is located on the bottom side wall; the outlet of the second mixing tank is equipped with the output solenoid valve and the output speed control valve.

3. The gas mixing device of the modified atmosphere packaging machine as described in claim 2, characterized in that, The spiral angle of the spiral drainage tube is 30°.

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