Ldh Small Box Type Food Instrument 3 Cubic to 10 Cubic Nitrogen Generator

Beijing LIdaheng Technology Development Co., Ltd. is a high-tech enterprise specializing in the research, development, design, manufacturing, sales and service of all kinds of air separation equipment and low temperature application equipment. The company has a number of national patent certificates, computer soft certificate, and passed the European CE certification and ISO9001 certification.

The company pays attention to scientific and technological innovation, cooperates with foreign counterparts, and exchanges and cooperation with many domestic research institutions, universities and colleges. Fully absorb domestic and foreign enterprises advanced design concept, strict management procedures and exquisite manufacturing technology. On the basis of sincere service support, bold use of new technology, new technology, enhance the company's product research and development, manufacturing and service capabilities, to energy saving, superior quality and diversification.

Through years of research and exploration in the gas industry, we always insist on providing high-quality products and professional services for customers in various industries. We adhere to the concept of serving global users with Chinese products, and use cloud technology to serve customers around the world more quickly and intuitively.

The company's products involve metallurgy, petrochemical, electronics, machinery, building materials, food, medicine, new materials and other fields. Products sell well all over the country, but also exported to Peru, Venezuela, Austria, Nicaragua, Iraq, India, Bangladesh, Pakistan, Philippines, Angola, Kazakhstan and other countries.


Liquid Nitrogen system - Small liquid nitrogen machine

LDH small liquid nitrogen machine is a plug-in liquid nitrogen solution. Using the MRJT process of mixed working medium refrigeration, based on the throttling refrigeration cycle of the reheating type multiple mixed working medium, from the ambient temperature to the target refrigeration temperature, the high, medium and low boiling point pure components are selected to form the multiple mixed working medium, and the effective cooling temperature zone of each boiling point component is matched by relay. It is a refrigerator that can efficiently realize the temperature zone of -40~-196ºC.

The working principle of

The compressed air passes through the oil-free air compressor, after cold dry absorption and filtration, enters the PSA nitrogen maker, passes through the sterilizing filter, and generates sterile nitrogen with dew point of -60ºC. Sterile nitrogen enters the refrigerator and liquefies into liquid nitrogen.

Technical principle of liquid nitrogen machine

The liquid nitrogen machine is a cryogenic mixed working medium throttling refrigerator driven by a single compressor with precooling to achieve nitrogen liquefaction (-180ºC). Cryogenic mixed working medium throttling refrigerator is based on the regenerative type of multiple mixed working medium throttling refrigeration cycle. From the ambient temperature to the target refrigeration temperature, the highest, middle and low boiling point pure components constitute multiple mixed working medium, and realize the relay matching of the effective cooling temperature zone of each boiling point element. It is a kind of refrigerator that can be used to realize the temperature zone of -40ºC~-196ºC. The advantages of this product are: it can use mature commercial compressors, heat exchangers and other equipment in the market; High liquefaction efficiency, high reliability, no maintenance, long service life.

The principle of liquid nitrogen machine equipment is based on the principle of pressure swing adsorption, using high-quality carbon molecular sieve as adsorbent, under a certain pressure, nitrogen from the air. After purifying and drying compressed air, the adsorption and desorption are carried out under pressure and pressure in the adsorber. Due to the kinetic effect, the diffusion rate of oxygen in the micropores of carbon molecular sieve is much higher than that of nitrogen. When the adsorption is not in equilibrium, nitrogen is enriched in the gas phase to form the finished nitrogen. Then the pressure is reduced to normal pressure, and the adsorbent desorbs the adsorbed oxygen and other impurities to achieve regeneration. Generally set up two adsorption tower in the system, one tower adsorption nitrogen production, the other tower desorption regeneration, through PLC program automatic control, so that the two tower alternating cycle work, oxygen and nitrogen adsorption separation, so as to get qualified nitrogen.


Product features

Liquid nitrogen production: 10L-120L per day

Regular start and stop: You can set the power on and off time every day

Start and stop of liquid level: If equipped with liquid nitrogen tank with liquid level gauge, start and stop can be controlled according to the liquid level and display the liquid level

Remote MONITORING: MCGS remote monitoring, remote download of historical operation records, online program upgrade, convenient remote maintenance

Fully enclosed box type compact design

Liquid nitrogen dewar (optional)


Application industry
Nuclear magnetic resonance spectrometer

Nuclear magnetic resonance (NMR) spectroscopy is an analytical method based on the absorption of radiofrequency energy corresponding to the energy difference between the splitting levels of the nuclear nuclei with non-zero spin quantum numbers in the external high temperature superconducting magnetic field.

The spectrum of nuclear magnetic resonance spectrum through different nuclear spectrum peaks, chemical shift value, multiplicity, coupling constant value, the relative intensity of peaks and present in all kinds of two-dimensional spectrum and multidimensional spectrum of the correlation peak, species, number of atoms in molecules, space form, the connecting way of atoms, the structure of the relative orientation of qualitative information.

NMR quantitative analysis is based on structural analysis, which uses the relationship between the proton number of a specific group and the peak area of the corresponding spectral peak for quantitative determination. NMR spectroscopy is mainly used to determine the structure of small molecules of organic compounds and biological macromolecules in solution. It has a wide range of applications in chemistry, biology, physics, materials, pharmacy and medicine

Superconducting magnets are immersed in liquid helium, which is surrounded by liquid nitrogen. The function of liquid helium is to maintain the superconductivity of the magnet to provide the required magnetic field environment, and liquid nitrogen is to add a "temperature insulation layer" between the liquid helium and the external environment to reduce the volatilization of liquid helium.

Case study - Nuclear magnetic resonance spectroscopy

Customer requirements: 80-150L of liquid nitrogen per week for NMR spectroscopy.

Equipment requirements: equipped with liquid nitrogen machine + liquid nitrogen tank, equipped with regular start and stop and liquid level start and stop.

Finished product: equipped with 3L/ H liquid nitrogen machine, 100L digital display liquid level gauge liquid nitrogen tank.
Enterprise qualification