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Main functions of the device:

The animal environment test chamber is suitable for animal experiments. The low-pressure oxygen chamber is used to simulate low-pressure oxygen high-altitude environments. The pressure can be set according to needs, and the highest simulated altitude is 12000 meters. It is suitable for small and medium-sized animals such as dogs, monkeys, rabbits, mice, etc.

The entire experimental setup consists of an animal compartment, a vacuum system, and a monitoring and control system.

The equipment has a high degree of automation and does not require dedicated personnel to monitor, allowing for long-term operation for up to a month.

Performance indicators and system composition of animal environmental cabin

model

GC-DWHJC-137E  /  GC-DWHJC-416E  /  GC-DWHJC-1177E

Sample limitations

This testing equipment prohibits the testing of samples containing flammable, explosive, and volatile substances; Testing for storing samples of corrosive substances, testing for storing organisms, testing and storing samples of strong electromagnetic emission sources

Volume, weight, and size

Nominal internal volume

137L /   416L /   1177L

Effective size of inner box

Diameter 500 * Depth 700 mm

Diameter 700 * Depth 1200 mm

Diameter 1000 * Depth 1500 mm

Exterior space

Approximately 800mm in width, 1600mm in height, and 800mm in length

Approximately 1000mm in width, 1700mm in height, and 1300mm in depth

Approximately 1500mm in width, 1800mm in height, and 1700mm in depth

weight

Approximately 180kg/270kg/350kg respectively

Power, current, and power supply

Electric power consumption

16KW/25KW/30KW respectively

Maximum current

Respectively 1*/66A/80A

Power supply conditions

And power supply

AC220V three-phase R, N+protective grounding; The allowable voltage fluctuation range is 10%;

The allowable frequency fluctuation range is 50 ± 0.5HZ; TN-S power supply or TT power supply

The grounding resistance of the protective grounding wire is less than 4 Ω

Require users to configure corresponding capacity air or power switches for the equipment at the installation site, and this switch must be independently controlled. When placing powered samples in the equipment use box, please use an external power source for the sample power supply and do not directly use the local power supply;

performance index 

Environmental conditions for use

The value measured under the conditions of an ambient temperature of+25 ℃, relative humidity ≤ 85%, and no sample in the test chamber.

Heating and cooling rate

+25℃→+150℃≤50 min

+25℃→-30℃ ≤40 min

Temperature and humidity range

Temperature range:- 40℃ ～+75℃

Humidity range: 20-95% RH (as shown in the figure)

Altitude pressure

Simulate altitude from 0 to 12000 meters, pressure from 0 to 19 kPa can be freely set and controlled

display

Oxygen concentration, oxygen partial pressure detection, carbon dioxide concentration.

(If the concentration of oxygen and carbon dioxide needs to be controlled, the price will be calculated separately)

control accuracy

Temperature fluctuation: ≤ ±0.5℃

Temperature uniformity: ≤ 2℃

Temperature deviation: ±1℃

Temperature overshoot ≤ 2 ℃

Humidity range: 10％～98％RH

Humidity deviation: ± 3.0% RH (humidity>75% RH)

≤± 5.0% RH (humidity ≤ 75% RH)

Note: The heat capacity of steel shall not exceed 35kg/m3 per cubic meter of load, and there shall be no active heat load during the wet heat test

Note: The above performance indicators are measured under the conditions of an ambient temperature of+25 ℃, relative humidity ≤ 85%, and no sample.

structure characteristics

Box Structure 

Laminated cabin material: made of organic glass material,

Outer box material: Cold rolled steel plate 1.5mm thick baked paint treatment

The control box and test box are integrated

Fresh air exchange

Timed ventilation with built-in air chamber

Temperature and humidity regulation

The automatic circulating air duct and stainless steel circulating fan will distribute the temperature and humidity in the mixing room to the test space, and the wind will blow into the test chamber evenly to control the temperature and humidity in the test chamber evenly.

Box door

Single door opening

Interface

Provide RS232 and RS485 interfaces; Can open communication interfaces, communication parameters, and communication protocols,

Provide a remote centralized monitoring and management platform, which can directly achieve remote control and management through the intranet. It can centrally monitor more than 30 devices, remotely program, run, view curves, check alarm information, and start and stop operations.

Operation method

Provide two operating modes: local and remote;

Heat dissipation method

Concentrated water cycle

Energy saving control

Adopt energy-saving methods, provide proof and detailed description of energy-saving principles; The lower the energy consumption, the better

noise

Not exceeding 78dB

Simulation and analysis of the pressure bearing layer of the cabin

The simulated object is an external warehouse

Date: March 16, 2022 Designer: Solidworks

Example Name: Static Stress Analysis 2

Analysis type: Static stress analysis

catalogue

Explanation 1

Assumption 2

Example attribute 2

Unit 2

Load and Fixture 3

Grid Information 4

Sensor Details 5

Joint force 5

Beam 6

Example result 16

Test material rack

Made of 304 # stainless steel punched and bent into a mesh shape, easy to use, adjustable spacing between material racks, standard configuration of two pieces

Distribution control cabinet

Main power circuit breaker, controller, distribution board, cooling fan, over temperature protector

heating system 

Adopting scale heat dissipation heating tube P.I.D to control heating and achieve temperature balance

Humidification and dehumidification system

Adopting external humidification method, the compressor starts dehumidification, and P.I.D controls the humidification amount to achieve the required humidity

Water replenishment system

Self made PVC enlarged water tank, water pump for automatic water supply, circulating filtration and recycling

Introduction to Vacuum System

The vacuum system includes: vacuum pump, vacuum measurement, thin film gauge # 1: full pressure low vacuum measurement, range 100KPa~15Pa,

Base frame: Connect the vacuum container with it, fix it directly on the ground, and connect it reasonably with other systems.

Using one rotary vane pump with a total pumping speed greater than 5L/S.

The air pump adopts a well-known brand Feiyue high-quality vacuum pump, with high pumping speed, high vacuum degree, and more durability.

Product advantages

The control method adopts dynamic pressure balance, which is implemented under continuous operation of the vacuum system

The dynamic balance is now controlled, and the control system automatically controls the operation of the vacuum solenoid valve and vacuum pump (including frequency converter) based on the pressure setting value, adjusting the amount of suction/intake to achieve the requirements of dynamic pressure balance. The control effect is shown in the following figure:

Balanced Temperature and Humidity Control Method (BTHC Method)

Centrifugal fan for air circulation device, driven by a long axis external motor. Sealing adopts magnetic fluid sealing method

Air cooling method: finned evaporator

Air heating method: Stainless steel fin electric heater, contactless control

Formula for calculating vacuum pumping rate: variation curve of vacuum degree in a closed container with pumping time

The functional relationship between the increase in vacuum degree inside a sealed container and the pumping time when a vacuum pump is used to evacuate the container is as follows:

In the formula: P is the pressure inside the container (i.e. absolute vacuum degree); T is the independent variable and represents the pumping time

K3 is the ultimate vacuum degree value of the pump, while K1 and K2 are constants related to the pump, container size, environmental pressure, etc.

From this, it can be seen that in the initial stage of pumping, the pressure inside the container decreases rapidly (i.e., the increase in vacuum degree), and then decays exponentially, becoming slower and approaching the ultimate vacuum degree value of the pump infinitely.

If you want to know how long it takes to achieve the vacuum degree value you specified, you can click on the calculation tool to help you with theoretical calculations. Theoretical calculation values are for reference only!

Special note: According to our company's products, the calculation formula has been simplified. We are not responsible for any errors that may occur when calculating vacuum pumps from other brands.

Rough calculation formula for vacuum pump pumping volume/pumping speed

Q=(V/T) × ln (P0/P1), where Q is the pumping volume of the vacuum pump (L/s). V is the volume of the vacuum chamber, measured in liters (L). T is the time required to achieve the required absolute pressure, measured in seconds (S). P0 is the initial pressure inside the extracted volume. P1 is the required absolute pressure, measured in pascals (Pa).

The pumping volume refers to the pumping speed, which is one of the important parameters of a vacuum pump. The unit is generally expressed in L/S or m ^ 3/h. When selecting a pump, if the pumping volume is too small, it may not achieve the expected vacuum degree due to a series of factors such as air leakage; If the pumping volume is too large and the power consumption is too high, it is not economical. Therefore, it is very important to choose the appropriate amount of sobbing for the vacuum pump. Here is a brief introduction to the rough calculation formula for the pumping volume of a vacuum pump:

Q=(V/T) × ln (P0/P1)

Among them, Q is the pumping volume of the vacuum pump (L/s).

V is the volume of the vacuum chamber, measured in liters (L).

T is the time required to achieve the required absolute pressure, measured in seconds (S).

P0 is the initial pressure inside the extracted volume, which is one atmosphere. When calculating, it should be based on the local altitude value (click here to view the atmospheric pressure values in different altitude areas), and in coastal areas, it is generally taken as 101325. The unit is pascals (Pa), which can also be pallets or millimeters of mercury.

P1 is the required absolute pressure, measured in pascals (Pa), which can also be measured in pallets or millimeters of mercury. The so-called absolute pressure refers to the pressure calculated starting from absolute zero pressure, which is called absolute pressure. The atmospheric pressure is usually 101325 Pa, which is the absolute pressure of the atmosphere. When some gas is extracted from the sealed chamber, this value will decrease, reflecting the actual pressure inside the equipment. The absolute pressure value of the water ring vacuum pump is 3300Pa, and the maximum pressure value of the rotary vane vacuum pump is between 0.06-10Pa.

The above formulas are rough calculations and generally ignore external factors (such as circulating water temperature, altitude, power supply voltage, operating range value, etc.) that affect the efficiency of the vacuum pump. In actual selection, a certain safety value should be added on the basis of the calculated extraction volume above. The actual data during production shall prevail

refrigeration system

Refrigeration principle

Cooling method

In order to ensure the cooling rate and minimum temperature requirements of the laboratory, a binary duplex refrigeration system is used in this laboratory. The duplex system includes a high-temperature refrigeration cycle and a low-temperature refrigeration cycle, and heat exchange is achieved through an evaporative condenser

Refrigeration compressor

Adopting European imported French Taikang fully enclosed compressor

Cooling method

Air cooled scale condenser, circulating fan for heat dissipation

evaporator

Finned tube heat exchanger

Evaporative condenser

The layout heat exchanger using high-temperature copper brazing has a small surface area, low self energy loss, and high heat transfer efficiency

Throttling device

Thermal expansion valve, capillary tube

Fully imported refrigeration accessories

Oil separator

Separate the frozen oil droplets mixed with the high-temperature and high-pressure refrigerant gas discharged from the compressor, and return them to the compressor's curved track chamber for lubrication and cooling purposes

Dry filter

Absorb residual moisture and acidic substances in the refrigerant of the refrigeration system, and filter out solid impurities particles, copper chips, etc. in the system to protect the normal operation of the expansion valve and capillary tube from ice blockage and dirty blockage

cryogen

Using environmentally friendly refrigerants R404A/R23 as the refrigeration medium for this refrigeration system

electric control system 

controller

Weisi independently developed a controller with high control accuracy, USB port, easy operation, sensitive response, true color display, and capacitive touch screen. It can control temperature, humidity, and vacuum degree separately, and can monitor altitude, oxygen content, carbon dioxide content, and oxygen partial pressure separately.

Program capacity and control function

Available program quantity: up to 120 groups, one program can be combined from 1 to 99 segments

Usable memory capacity: 1200 segments, can execute commands repeatedly: each command can be executed up to 999 times, program slope can be set by the timeline, programs can be linked and used, and program creation adopts conversational operation with simple operation

Equipped with functions such as editing, clearing, and inserting, with 4 sets of time signal output control (controllable control of the ON/OFF action of the test object)

It has 9 sets of PID parameter settings, with jump and hold functions during program execution, and can display curves and obtain data; Date and time adjustment function; Button and screen lock (LOCK) function, can be connected to a computer for use

communication

RS-232 communication interface, can be used as a monitoring and remote control system, record test data

Operation mode

Program mode/fixed value mode

Setting method

Chinese/English interface, touch input

Set Range

Maximum temperature range with upper and lower limits of 5 ℃

Display resolution

Temperature: 0.01 ℃; Humidity: 0.1%; Time: 1min;

Power off memory function

The power-off recovery mode can be set to: hot start/cold start/stop

Appointment startup function

You can freely set the startup time, and the machine will automatically run after turning on the power

Input

PT100 platinum resistor

Curve recording function

RAM with battery protection, capable of storing device settings, sampling values, and sampling time; The maximum recording time is 60 days (when the sampling period is 1.5 minutes)

Software usage environment

IBM PC compatible machine, with a P Ⅱ or above CPU, 128MB or above memory, Simplified Chinese Windows 2000 or Simplified Chinese Windows XP operating system

Circulating fan

Low noise multi wing centrifugal fan

heater

Imported nickel chromium alloy electric heater

Heater control method: contactless equal period pulse width modulation, SSR (solid-state relay)

Humidifier

Imported nickel chromium alloy electric heater

External wetting method

control mode 

Anti integral saturation PID, BTC balance temperature control method (temperature testing equipment)

BTHC Balanced Temperature and Humidity Control Method (Temperature and Humidity Testing Equipment)

Wet heat system water supply (only wet heat type)

Water supply method

Pump lifting

Humidification and dehumidification system

Adopting external humidification method, the compressor starts dehumidification, and P.I.D controls the humidification amount to achieve the required humidity

Water supply device

1. The machine is equipped with a small water softener filter unit, which only needs to be connected to tap water to automatically produce the required purified water for spraying, effectively preventing impurities in the water quality from adhering to the surface of the sample and affecting the test results; Water supply pressure: 0.1-0.4Mpa

2. PVC large water tank, can be manually refilled when water supply is inconvenient

Water quality requirements for water supply

Electrical resistivity ≥ 500 Ω· m

Safety protection device

refrigeration system

Compressor overheating, overcurrent, overpressure, condenser fan overheating

Test box

Extreme overheating, fan and motor overheating relay

Humidification system 

Humidification heat pipe dry burning, abnormal water supply, abnormal drainage, abnormal water shortage

Power Supply

Leakage protection, overload and short circuit protection

Storage environment requirements

The ambient temperature of the equipment should be maintained within 0 ℃ to+35 ℃

Installation site requirements

The distance between the left, right, and rear wall panels of the test chamber and the wall must not be less than 800mm, and the distance between the front and the wall must not be less than 1000mm. When transporting equipment, whether it is possible to enter the entrance, passage, elevator, etc., to avoid affecting the progress of your company's project.

type of shipping

Whole machine transportation