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Liquid nitrogen refrigeration system and method for fishing boat

A liquid nitrogen refrigeration and liquid nitrogen technology, applied in household refrigeration devices, applications, household appliances, etc., can solve the problems of inaccurate temperature control, fuel consumption, increased maintenance costs, etc., and achieve the effect of improving temperature control accuracy

Pending Publication Date: 2018-08-03
广州聚联物流有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of refrigeration unit system has complex structure, high maintenance costs, long pre-cooling time, and fuel consumption on board. For fishing boats that have been operating at sea for a long time, under the condition of strong moisture and corrosion, the operation reliability of the refrigeration unit must be ensured. , it is necessary to use more expensive units, which will increase the cost of maintenance; secondly, the refrigeration unit needs a lot of electricity, so it needs to consume more fuel and reduce the endurance of fishing boats
[0004] Therefore, some people have proposed to apply liquid nitrogen refrigeration technology on fishing boats to keep fresh, but at present, these technologies have the problem of inaccurate temperature control

Method used

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  • Liquid nitrogen refrigeration system and method for fishing boat
  • Liquid nitrogen refrigeration system and method for fishing boat
  • Liquid nitrogen refrigeration system and method for fishing boat

Examples

Experimental program
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Effect test

Embodiment 1

[0062] In order to solve the problems in the prior art, this embodiment proposes a liquid nitrogen refrigeration system for fishing boats, such as figure 1 with figure 2 As shown, the system includes a refrigerator compartment 100, a liquid nitrogen dewar 101, a first vacuum hose 102, a second vacuum hose 103, a bus bar 104, a liquid nitrogen delivery pipe 105, a liquid nitrogen spray pipe 106, Manual valve 107, low temperature electric valve 201, controller, touch screen and temperature sensor.

[0063] The liquid nitrogen dewar 101 can be provided in multiples according to actual needs, and the number of the second vacuum hose 103 is the same as the number of the liquid nitrogen dewar 101. The multiple liquid nitrogen dewars 101 are respectively connected to the input ends of the busbar 104 through different second vacuum hoses 103, and the number of input ends of the busbar 104 is the same as the number of the liquid nitrogen dewars 101. The output end of the busbar 104 is co...

Embodiment 2

[0073] This embodiment provides a fishing boat with the liquid nitrogen refrigeration system described in Embodiment 1. Refer to image 3 The fishing boat includes a hull 301, an engine room 302, a power system 303, an electric power and control system 304 and a liquid nitrogen refrigeration system. The engine room 302 is located below the cockpit deck, and the refrigerating room is located in front of the engine room 302. A hatch cover 305 is provided on the deck, and the position of the hatch cover 305 is above the liquid nitrogen dewar to facilitate the replacement of the liquid nitrogen dewar.

Embodiment 3

[0075] This embodiment provides a liquid nitrogen refrigeration method using the liquid nitrogen refrigeration system described in Embodiment 1. Refer to Figure 5 , The method includes the following steps:

[0076] A. Input the target temperature of the refrigerator compartment to the controller through the touch screen;

[0077] B. Collect the initial temperature of the refrigerator compartment before cooling down through the temperature sensor inside the refrigerator compartment;

[0078] C. Calculate the duty cycle of the PWM wave for controlling the low-temperature electric valve according to the input target temperature and the initial temperature of the refrigerating chamber; the calculation formula for the duty cycle D of the PWM wave is:

[0079]

[0080] Where T 1 Is the starting temperature of the refrigerator compartment, T 2 Is the target temperature of the refrigerator compartment, where T 1 > T 2 ; V is the size of the refrigerator compartment, K is the refrigeration co...

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Abstract

The invention discloses a liquid nitrogen refrigeration system and method for a fishing boat. The system comprises a refrigerating chamber, a liquid nitrogen dewar flask, a liquid nitrogen conveying pipeline, a liquid nitrogen spraying pipeline, a low-temperature electric valve, a controller, a touch display screen and a temperature sensor; the method comprises the following steps that a target temperature of the refrigerating chamber is input, and a starting temperature of the refrigerating chamber is collected; the duty ratio of PWM waves used for controlling the low-temperature electric valve is calculated according to the input target temperature and the initial temperature of the refrigerating chamber; the controller controls the low-temperature electric valve to be conducted throughthe PWM waves, so that the liquid nitrogen is sprayed into the refrigerating chamber to complete refrigeration; and the controller is used for closing the low-temperature electric valve after the temperature of the refrigerating chamber reaches the target temperature. According to the liquid nitrogen refrigerating system and method, the spraying amount of liquid nitrogen is controlled through thePWM waves, and the temperature control precision of the liquid nitrogen refrigerating system can be effectively improved. The system and method can be widely applied to the technical field of refrigeration.

Description

Technical field [0001] The invention relates to the technical field of refrigeration, in particular to a liquid nitrogen refrigeration system and method for fishing boats. Background technique [0002] The current preservation technology of fishing boats includes cooling and freezing. Cooling and preservation is to reduce the temperature of the fish body to close to the freezing point of the juice in the fish body, thereby inhibiting and slowing down the activity of enzymes and microorganisms, so that the fish body can be used for a certain period of time. Keep good freshness inside. The temperature of the fish tank is generally between -5°C and 0°C, and the freshness period is between 10 and 27 days depending on the temperature and the type of fish. Freezing preservation is to freeze fish products below -18°C and inhibit the growth of bacteria to achieve longer-term preservation. The new technologies currently applied include low-temperature preservation, ultraviolet and ozone c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25D3/10A23L3/36F25D29/00
CPCA23L3/36F25D3/10F25D29/001
Inventor 梁比琦易丁萍
Owner 广州聚联物流有限公司
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