Liquid nitrogen spraying quick-freezing device

Abstract

A liquid nitrogen spraying quick-freezing device comprises a buffer tank and a liquid nitrogen tank, a liquid nitrogen inlet of the buffer tank is connected with the liquid nitrogen tank through a first pipeline, an electric control valve is arranged on the first pipeline, a liquid level detection device and a pressure sensor are arranged on the buffer tank, an exhaust pipeline is connected to an exhaust port of the buffer tank, and the liquid level detection device and the pressure sensor are arranged on the exhaust pipeline. An electric control exhaust valve is arranged on the exhaust pipeline, at least two liquid nitrogen outlets are formed in the buffer tank at intervals, and any liquid nitrogen outlet is connected with a second pipeline. Nitrogen is exhausted through the exhaust pipeline and the electric control exhaust valve, so that it is guaranteed that a follow-up nozzle can spray out a set amount of non-vaporized nitrogen-free liquid nitrogen, and the influence of all vaporization reactions generated in the process that the liquid nitrogen enters the buffer tank from the liquid nitrogen tank to be sprayed out of the liquid nitrogen nozzle on the quick-freezing function of the liquid nitrogen is greatly reduced; and the effectiveness and quality of quick freezing are ensured.

Description

Technical Field

[0001] The utility model relates to the field of physics, in particular to a food freezing technology, in particular to a liquid nitrogen spraying quick freezing device. Background Art

[0002] With the development of society and the continuous improvement of people's living standards, consumers have higher requirements for food quality. From the national level to production enterprises and consumer terminals, food quality and safety are increasingly placed in a more important position. In order to effectively and significantly improve food quality and safety, more and more food manufacturers use quick freezing technology in the process of food processing, using ammonia, Freon or liquid nitrogen for refrigeration. Liquid nitrogen refrigeration can quickly freeze products and pass the ice crystal formation zone, preventing large ice crystals from forming in food cells and destroying cell walls, which can better maintain the original flavor and quality of the product, and has obvious environmental benefits. Therefore, liquid nitrogen refrigeration has become the main trend of food freezing.

[0003] In the prior art, the liquid nitrogen cooling device used for assembly line production includes a liquid nitrogen tank, a pipeline, a valve and a nozzle. During operation, the liquid nitrogen is very easy to vaporize when it is ejected from the liquid nitrogen tank through the pipeline from the nozzle, resulting in the liquid nitrogen ejected from the nozzle containing more nitrogen, which has a great impact on the quick freezing function of the liquid nitrogen, cannot meet the needs of rapid freezing, has low freezing efficiency, causes quality problems, consumes a lot of energy, and leads to waste of resources. Summary of the invention

[0004] The utility model aims to provide a liquid nitrogen spray quick freezing device, which aims to solve the technical problem in the prior art that liquid nitrogen is very likely to generate a vaporization reaction during the process of being sprayed from a liquid nitrogen tank through a pipeline from a liquid nitrogen nozzle, which has a significant impact on the quick freezing function of the liquid nitrogen.

[0005] The utility model discloses a liquid nitrogen spray quick freezing device, comprising a buffer tank and a liquid nitrogen tank, wherein the liquid nitrogen inlet of the buffer tank is connected to the liquid nitrogen tank through a first pipeline, the first pipeline is provided with an electric control valve, the buffer tank is provided with a liquid level detection device and a pressure sensor, the exhaust port of the buffer tank is connected to an exhaust pipeline, the exhaust pipeline is provided with an electric control exhaust valve, at least two liquid nitrogen outlets are arranged at intervals on the buffer tank, any liquid nitrogen outlets are respectively connected to a second pipeline, any second pipeline is respectively provided with an electromagnetic valve and at least one liquid nitrogen nozzle, and the electric control valve, the electric control exhaust valve, the control end of the electromagnetic valve, the liquid level detection device, and the signal output end of the pressure sensor are all connected to a controller.

[0006] Furthermore, the number of the liquid nitrogen nozzles on any one of the second pipelines is two.

[0007] Furthermore, a safety valve is provided on the first pipeline.

[0008] Compared with the prior art, the utility model has a positive and obvious effect. After the liquid nitrogen in the liquid nitrogen tank is controlled by the electric control valve to enter the buffer tank, the nitrogen generated by the vaporization reaction of the liquid nitrogen during the transportation process enters the buffer tank. The pressure sensor is used to detect the pressure of the buffer tank and send it to the controller. When the pressure reaches the set value, the controller opens the electric control exhaust valve and discharges the nitrogen through the exhaust pipe and the electric control exhaust valve, so as to ensure that the subsequent nozzle can spray out a set amount of liquid nitrogen that is not vaporized and does not contain nitrogen, which greatly reduces the influence of all vaporization reactions generated in the process from the liquid nitrogen tank entering the buffer tank to spraying from the liquid nitrogen nozzle on the quick freezing function of the liquid nitrogen, and ensures the effectiveness and quality of quick freezing. The liquid level detection device detects the amount of liquid nitrogen inside the buffer tank and sends a signal to the controller. The controller controls the start and stop of the electric control valve. At the same time, the controller sets the time, spray amount and spray time interval of each solenoid valve spraying liquid nitrogen from the liquid nitrogen nozzle, so as to achieve the purpose of improving production efficiency, maintaining food quality, precise control and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The utility model is a schematic diagram of a liquid nitrogen spray quick freezing device. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and is not a limitation on the technical solution of the present invention.

[0011] like Figure 1 As shown, a liquid nitrogen spray quick freezing device of the utility model comprises a buffer tank 7 and a liquid nitrogen tank (not shown in the figure), the liquid nitrogen inlet of the buffer tank 7 is connected to the liquid nitrogen tank through a first pipe 8, the first pipe 8 is provided with an electric control valve 3, the buffer tank 7 is provided with a liquid level detection device 1 and a pressure sensor (not shown in the figure), the exhaust port of the buffer tank 7 is connected to an exhaust pipe 9, the exhaust pipe 9 is provided with an electric control exhaust valve 4, at least two liquid nitrogen outlets are arranged at intervals on the buffer tank 7, any one of the liquid nitrogen outlets is respectively connected to a second pipe 10, any one of the second pipes 10 is respectively provided with a solenoid valve 5 and at least one liquid nitrogen nozzle 6, the electric control valve 3, the electric control exhaust valve 4, the control end of the solenoid valve 5, the liquid level detection device 1, and the signal output end of the pressure sensor are all connected to a controller (not shown in the figure).

[0012] Furthermore, the number of the liquid nitrogen nozzles 6 on any one of the second pipelines 10 is two.

[0013] Furthermore, a safety valve 2 is provided on the first pipeline 8 .

[0014] Specifically, the buffer tank 7, liquid nitrogen tank, electric control valve 3, liquid level detection device 1, pressure sensor, electric control exhaust valve 4, second pipeline 10, solenoid valve 5, liquid nitrogen nozzle 6, controller, etc. in this embodiment all adopt well-known solutions in the prior art, which are well known to those skilled in the art and will not be described in detail here.

[0015] The utility model is suitable for scenarios where liquid nitrogen is required for rapid cooling to ensure product quality and stability, such as food processing industry, pharmaceutical field, laboratory scientific research, etc.

[0016] The working principle of this embodiment:

[0017] After the liquid nitrogen in the liquid nitrogen tank is controlled by the electric control valve 3 to enter the buffer tank 7, the nitrogen generated by the vaporization reaction of the liquid nitrogen during the transportation process enters the buffer tank 7. The pressure sensor is used to detect the pressure of the buffer tank 7 and send it to the controller. When the pressure reaches the set value, the controller opens the electric control exhaust valve 4 and discharges the nitrogen through the exhaust pipe 9 and the electric control exhaust valve 4, so as to ensure that the subsequent nozzle can spray out a set amount of liquid nitrogen that is not vaporized and does not contain nitrogen, which greatly reduces the impact of all vaporization reactions on the quick freezing function of liquid nitrogen generated in the process of liquid nitrogen entering the buffer tank 7 from the liquid nitrogen tank to being sprayed from the liquid nitrogen nozzle 6, and ensures the effectiveness and quality of quick freezing. The liquid level detection device 1 detects the amount of liquid nitrogen inside the buffer tank 7 and sends a signal to the controller. The controller controls the start and stop of the electric control valve 3. At the same time, the controller sets the time, spray amount and spray time interval of each time the solenoid valve 5 sprays liquid nitrogen from the liquid nitrogen nozzle 6, so as to achieve the purpose of improving production efficiency, maintaining food quality, precise control and saving energy.

[0018] The safety valve 2 is used as a safety measure to ensure that when the liquid level detection device 1 or the electric control valve 3 fails, the nitrogen generated by the liquid nitrogen inside the pipeline can also be discharged through the safety valve 2 when the pressure is too high.

[0019] The utility model has the following benefits for food production and processing that requires rapid freezing in an assembly line:

[0020] 1. Improve production efficiency: The liquid nitrogen spray device quickly sprays out liquid nitrogen that has not been vaporized and does not contain nitrogen, which can complete a freezing process in a very short time, accelerate the freezing speed of food, and thus improve production efficiency. In assembly line production, the device that quickly sprays liquid nitrogen can work synchronously with the production line to ensure that the food is quickly frozen during the production process.

[0021] 2. Maintain food quality: Rapidly spraying unvaporized, nitrogen-free liquid nitrogen can effectively freeze food, prevent the food from forming large ice crystals or losing moisture during the freezing process, and help maintain the taste, nutrition and quality of the food. Rapid freezing is especially important for products that need to maintain their original flavor and appearance.

[0022] 3. Precise control: By using the controller to control the solenoid valve 5 and the electric control valve 3, the injection time and flow rate of liquid nitrogen can be accurately controlled to ensure that each freezing process can achieve the expected effect. In assembly line production, precise control is the key to ensuring product consistency and stable quality.

[0023] 4. Energy saving: It can complete the freezing process in a short time and reduce energy consumption. In large-scale assembly line production, it can not only reduce production costs, but also be beneficial to environmental protection and sustainable development.

Claims

1. A liquid nitrogen spray quick freezing device, characterized in that: The invention comprises a buffer tank and a liquid nitrogen tank, wherein the liquid nitrogen inlet of the buffer tank is connected to the liquid nitrogen tank through a first pipeline, the first pipeline is provided with an electric-controlled valve, the buffer tank is provided with a liquid level detection device and a pressure sensor, the exhaust port of the buffer tank is connected with an exhaust pipeline, the exhaust pipeline is provided with an electric-controlled exhaust valve, at least two liquid nitrogen outlets are arranged at intervals on the buffer tank, any one of the liquid nitrogen outlets is respectively connected to a second pipeline, any one of the second pipelines is respectively provided with an electromagnetic valve and at least one liquid nitrogen nozzle, and the electric-controlled valve, the electric-controlled exhaust valve, the control end of the electromagnetic valve, the liquid level detection device, and the signal output end of the pressure sensor are all connected to a controller.

2. A liquid nitrogen spray quick freezing device according to claim 1, characterized in that: The number of the liquid nitrogen nozzles on any one of the second pipes is two.

3. A liquid nitrogen spray quick freezing device according to claim 1, characterized in that: The first pipeline is provided with a safety valve.

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