Drug storage box, laboratory refrigerator, medical refrigerator selection and purchase experience

The first step: know the drug storage box, laboratory refrigerator, medical refrigerator

1, use:

The drug storage box and the laboratory refrigerator can be classified as a kind of product, which are named according to the use and use scene, and are all low-temperature equipment. They are suitable for preservation laboratories such as universities, research institutes, institutions, biomedical chemical enterprises, hospitals, etc. Reagent supplies, pharmaceuticals, biological products, etc. (hereinafter collectively referred to as drug storage boxes)

2, working principle:

The drug storage box is composed of a refrigeration system, a digital temperature control system, an air circulation system, a temperature sensor and the like. The temperature control is mainly realized by the instrument control refrigeration system, and the refrigeration system is the key to the drug storage box.

The refrigeration system is mainly composed of core components such as compressor, condenser, evaporator and expansion valve. These devices are connected in turn by pipes to form a closed system. When the system is working, the compressor draws the low-temperature and low-pressure refrigerant vapor generated by the evaporator into the cylinder, compresses it by the compressor, and the pressure rises (the temperature also rises) to a pressure slightly larger than that in the condenser, and the cylinder is The high pressure refrigeration steam is discharged into the condenser. (The compressor acts as a compression and transport refrigerant). The high temperature and high pressure refrigerant vapor in the condensation exchanges heat with the lower temperature air (or normal temperature water) to condense into a liquid refrigerant. At this time, the liquid refrigerant expands. After the valve is cooled (depressurized), it enters the evaporator and absorbs the heat of the cooled object in the evaporator and then vaporizes. Thus, the object to be cooled is cooled and the refrigerant vapor is sucked away by the compressor, so that one cycle is completed in the refrigeration system by compression, condensation, expansion, and evaporation.

Step 2: Determine the volume

The volume of the drug storage box is generally determined according to the size of the laboratory and the amount of the drug to be placed and the size of the place where the drug storage box is placed. In the model of the general manufacturer, the numerical suffix is ​​the volume of the drug storage box: For example, GYYP-900, 900 means that the volume of the drug storage box is 900.

Step 3: Understand the existing market brand

Generally, there are some comprehensive collections on some professional instrument websites, or you can find a lot of them directly in Baidu search. It should be noted that some brands are similar products of the kind of supermarkets used in supermarkets or stores. Materials and production will be rough. The products of the manufacturers who choose to make the instruments should be more reliable.

Step 4: Compare the characteristics of each brand in detail and find the brand that suits you.

Mainly from the hardware, temperature control performance, after-sales service and other aspects to consider.

In terms of hardware, it is mainly necessary to consider the brand of compressors used by this brand. It is best to choose a good compressor. The compressor is the heart of the refrigeration equipment. The good brand in the industry should be secop sip (the original Danfoss Danfoss).

Temperature control performance is mainly to compare temperature uniformity, temperature control accuracy is similar, the temperature range is generally 0-10 degrees;

In terms of after-sales service, almost every brand can not have its own after-sales strength in various places. Even if it is a sea* brand, it also outsources after-sales service, and medical products are after-sales organizations that use home appliances, and basically do not. From the current form, it is best to find a brand with a general agent in the local area will be more reliable, the agency company will generally have its own after-sales strength.

Step 5: Common problems

1. The difference between a drug storage box (laboratory refrigerator) and a household refrigerator

First of all, some refrigerators used in the laboratory must be precise and constant temperature, and the temperature control performance requirements are relatively high. For example, some blood station thermostat cabinets must have precise control of 1 degree. The refrigerator in the home generally requires temperature. Low, temperature uniformity is even worse.

Secondly, laboratory refrigerators have high requirements in material selection, sheet thickness, foaming, etc., while household refrigerators are low in cost and cost control is low, so the choice of compressors and plates is the first cost. To consider.

Again, most of the laboratory refrigerators are designed with air-cooling principles, while household refrigerators are basically straight-cooled, and of course cost considerations.

In addition, the laboratory refrigerator should have a temperature display panel, you can observe the temperature inside the box at any time to prevent unnecessary losses. The laboratory refrigerator should be equipped with a safety lock, especially for some special experimental items, special personnel are required.

2, the difference between air cooling and direct cooling

The laboratory refrigerator is generally cooled by air-cooling, and a fan is used to form a stable and uniform air flow in the refrigerator cabinet, thereby achieving accurate temperature control. The evaporator in the refrigeration system is fin-type and has a high cost.