RU2254924C9 - Climatic chamber - Google Patents

Abstract

FIELD: special-purpose laboratory equipment.

SUBSTANCE: proposed climatic chamber includes heat-insulated reservoir with door, humidifier for forming required humidity of air in chamber, temperature sensor and humidity sensor; besides that, chamber is provided with air and vapor delivery pipe unions and air evacuation pipe union, variable-capacity compressor connected to air supply pipe union and air-change rate regulator connected to compressor; heating cable wound on the outside of reservoir is used for heating air in chamber to required level of positive temperatures; humidity sensor included into control system ensures maintenance of preset humidity and is provided with humidity regulator; temperature sensor is also included into control system for maintenance of temperature within preset limits; this control system includes temperature regulator.

EFFECT: possibility of maintaining required air-change rate, temperature and humidity of air in chamber.

5 cl, 1 dwg

Description

The invention relates to specialized laboratory equipment intended for conducting sanitary-chemical studies with adjustable parameters of temperature, relative humidity and the rate of air exchange inside the chamber, and may find application in testing laboratories in the chemical, medical, pharmaceutical, food and other sectors of the national economy.

Known chamber, designed to test products at low or high temperature with low pressure, providing electrical voltage to the product and measuring parameters during the test. (GOST 5.2030-73 "KTKhB-K-0.025-65 / 155 type pressure chamber. Requirements for the quality of certified products").

The disadvantage of this device is that the camera has a highly specialized purpose, and its design does not provide for the measurement of humidity and its adjustment during operation.

Known cameras according to GOST 28237-89 (ST IEC 260-68) "Non-injection type cameras to obtain constant relative humidity." This type of chamber is equipped with a container with a door, a fan, a salt solution tray, a temperature control system, a temperature measuring device and a humidity measuring device. This camera was selected as a prototype.

Tests in this type of chamber are carried out at constant stable values of temperature and relative humidity.

The disadvantage of this chamber is the use of saturated solutions of salts or mixtures of glycerol with water to control the relative humidity of the air.

The invention has the following task: creating a chamber design that provides multiple air exchange and maintains the necessary temperature and humidity inside a closed volume.

The problem is solved in that:

a) the air exchange rate in the chamber capacity is supported by the air exchange rate controller, which controls the compressor with an adjustable capacity;

b) the set values of positive air temperatures in the chamber are carried out by electric heating of its body with a heating cable wound around the entire length of the tank, and the achievement and maintenance of the set air temperature is provided by a control system that includes a temperature sensor and a temperature controller that controls the heater power supply;

c) the set values of the air humidity in the chamber are carried out by an air humidifier, consisting of a vessel with distilled water and an electric heater placed in it, and the achievement and maintenance of the set air humidity is provided by a control system that includes an air humidity sensor and a humidity regulator that controls the power supply of the electric heater of the humidifier .

The main parts of the camera are presented in the drawing.

The chamber contains a thermally insulated container 1 with a heating cable 2 and a door 3, a compressor 4 with an electric motor, a humidifier 5, a temperature sensor 6, a humidity sensor 7, a filter 8. Compressor 4 is designed for adjustable air supply to the chamber. Humidifier 5 is a thermally insulated vessel with an electric heater, filled with distilled water. On the dashboard (not shown) there is a humidity regulator 9, a temperature regulator 10, an air exchange rate regulator 11, a main and start switch (not shown), and a nozzle 12 for supplying air to the tank 1. On the door 3 of the tank 1, fittings 13 for air exhaust from the chamber and air sampling. At the bottom of the tank is a fitting 14 for supplying steam from the humidifier. The humidifier is charged with water through the filler neck 15 on the control panel (not shown) to the corresponding marks on the level indicator (not shown). For better viewing, the level gauge is backlit.

The camera is as follows.

Inside the tank 1 set the test sample. The door 3 is hermetically closed.

Air from the room through the filter 8 is supplied by the compressor 4 to the tank 1.

The air exchange rate in the tank 1 is set using a driving resistor on the dashboard and is supported by the air exchange rate controller 11, which controls the capacity of the compressor 4. The air exchange in the chamber is provided by a compressor with adjustable capacity depending on the given air exchange rate.

Throughout the entire range of changes in the rate of exchange of air, the set values of temperature and humidity of the air pumped through the chamber are provided.

The air humidity in the chamber is controlled by heating the humidifier 5, and the air temperature is controlled by heating the tank 1.

Providing specified values of positive air temperatures in the chamber is carried out by electric heating of its housing by a heating cable 2, wound outside the cylindrical container 1 along the entire length. Achieving and maintaining a predetermined air temperature is provided by a control system including a temperature sensor 6 and a temperature controller 10, which controls the power supply of the heater 2.

Providing the specified values of the humidity in the chamber is carried out by a humidifier 5, consisting of a vessel with distilled water and an electric heater placed in it. Achieving and maintaining a given air humidity is provided by the control system, which includes an air humidity sensor 7 and a humidity controller 9, which controls the power supply of the humidifier electric heater.

Through the nozzles 13 is the sampling of air for analysis.

Most structural elements are made of stainless steel. The multiplicity of air exchange inside the chamber is from 0.5 to 5 chamber volumes per hour.

Claims (5)

1. The climatic chamber, including a thermally insulated container with a door, a humidifier to ensure a given air humidity in the chamber, a temperature sensor and a humidity sensor, characterized in that the chamber is equipped with fittings for air supply, steam supply and air exhaust; a variable speed compressor connected to an air connection; air exchange rate regulator connected to the compressor; outside the container, a heating cable is wound to electrically heat its body and ensure the set values of positive air temperatures in the chamber; humidity sensor is included in the control system, ensuring the maintenance of a given humidity and also includes a humidity controller; a temperature sensor is included in the control system, ensuring the maintenance of a given air temperature and also including a temperature controller. 2. The climate chamber according to claim 1, in which the humidifier is a vessel with distilled water and an electric heater disposed therein. 3. The climatic chamber according to claim 1, in which the air exchange rate controller controls the performance of the compressor. 4. The climatic chamber according to claim 1, in which the humidity controller controls the power supply of the electric heater of the humidifier. 5. The climatic chamber according to claim 1, in which the temperature controller controls the power supply of the heating cable.