SU1386806A1 - Testing chamber for simulating parameters of environment - Google Patents

Abstract

A test chamber for simulating climatic states of temperature and humidity and having two separate circulations for a temperature adjusting gas comprises, a substantially U-shaped baffle (5), arranged between a thermally insulated outer container (1) having a door 3, and three walls of a five-sided inner container (4), the edges of said baffle (5) being in contact with the inner wall of the outer container (1) and also with the door frame (2), said baffle being provided with a fan (7) in an opening (6) and with a perforate base (8) divided by a deflector (9). A working chamber (10) also provided with a door (12) is surrounded by said inner container (4), and both the working chamber (10) and the inner container (4) are fixed to the door frame (11). A fan (15) provides for temperature adjustment of the gas circulating internally of the U-shaped baffle, and the opposite face (17) of the working chamber (10) is perforate. A swivelling angle flap (19) connects the two separate circulations. <IMAGE>

Description

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The invention relates to air conditioning technology 1, and predator Yacheno for isolating extreme climatic factors, temperature and humidity with a wide operating range and high accuracy. : Yves of Czechoslovakia patent No. 96808 (N.kl. 6dl / 56, I960) is a well-known tester Ya camera to simulate the ambient;; containing a case with a door j Suspended on a frame, two ventilators placed in it with a gap, the first of which is installed is the tank, and the second is in the gap, and | also located in the last source {steam and heater.

A disadvantage of the known device is that, with the aid of a selected thermostatising system, high demands on the netw are and. High values of humidity (about 98%) can be performed only in a limited range of I, temperature and humidity I of air, but high rates of change cannot be achieved. Besides ,; reproduction of climatic parameters varying over a wide range of temperatures (- + 180 ° C) while maintaining constant high values of moisture content (including the value of

 98% at t.

80 C) and high speed

To change the above parameters, S requires large technical costs. This is due to the fact that the known device satisfies only the limited requirements with respect to the constancy of temperature, does not provide paBHOMap temperature distribution in icaMS - re and does not allow to achieve high humidity of the air in the chamber.

This is especially true of achieving high humidity. As with the control command, the cooling of the temperature constancy over time plus the local temperature distribution in the mean value of K is not achievable, and the temperature difference between the average air temperature and the lowest temperature of the evaporator surface or the temperature of the casing of the test chamber, which is always greater than 1.0 K during the cooling command and due to the limited possibilities of matching the energy of the cooling

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The capacity of the refrigerating compressor, including the evaporator, with the need for the cooling capacity at the corresponding temperature of the evaporation chamber in the temperature and humidity regime is unsuitable for stable highest humidity values equal to 97% and higher. Similarly, the rate of temperature change is adversely affected by the high heat capacity of the thermostatic fluid, the average value of which is less than that of the directly thermostated test chambers. The temperature range is limited due to the limits of the application of the thermostatic liquid and lies between and

The purpose of the invention is to ensure the possibility of testing under extreme environmental conditions (temperature range (100 ° C +180 ° C) and by, maintaining relative air humidity of up to 97% and higher in the temperature range (+ 80 ° C) at local plus time temperature differences equal to)

The goal is achieved by the fact that a test chamber for simulating environmental parameters, containing a housing with a door suspended on a frame 5 with a reserv tank located in it with a gap, two fans, the first of which is installed in the tank and the second in the gap, as well as In the latter, the evaporator and the heater, according to the invention, are provided with an i-shaped steel sheet, installed in the gap, and the edges and opening adjacent to the frame and frame to accommodate the second fan, while When installing the sheet glass fan, it is made perforated, the reservoir is provided on the side of the perforated sheet wall with a deflector cap and is double-walled; the outer wall of the tank has an angle flap, one of its inner walls is perforated, and the opposite has an opening for installation in it with a gap of the first fan, and both fans are placed on the same shaft.

Figure 1 shows a camera, a longitudinal section; FIG. 2, FIG. one ,

The chamber contains a housing 1 with two lights 3 suspended on a frame 2, a tank 4 arranged with a gap 4 in it, two fans 15 to 7, the first of which is installed in tank 4, and the second in the gap and also located in the latter is an evaporator 23 and a heater 24. The chamber is also provided with an i-shaped steel sheet 5 installed in the gap and having an edge and an opening 6 adjacent to the housing 1 and the frame 2 and accommodating the second fan 7. Opposite to the installation the fan 7, the wall 8 of the sheet 5 is perforated, the tank 4 is provided with To- RONA of the perforated wall 8 of the sheet 5 with a deflecting visor 9 and made double-walled. The outer wall of the reservoir 4 has an angle flap 19, one of its inner walls 17 is formed on a perforated one, and the opposite to the wall 13 has an opening 14 for installation in it with a gap of the first fan 14 for installation in it with a gap in the first fan 15, and. Both fans 15 and 17 are located on the same shaft 16. Double-walled tank 4 has a chamber 10 and is attached to frame II.

The inner door 12 may coincide with the door 3 of the housing 1.

The fastening of the double-wall tank 4 can be effected by using the fingers 28 made of a material with a low thermal conductivity fixed in the side walls of the tank 4 and in the tire 27, while the tire 27 can rest on the supporting fingers 29 fixed in the housing 1.

The passage opening in the outer wall of the tank 4 for the shaft 16 may have a diameter greater than the diameter of the shaft 16 and form an annular gap 30.

The supply of dry or moist air to the tank 4 can be carried out through the supply system 25, and the air can be discharged through the removal system 26.

The corner flap 19 can be rotated by means of the pivoting device 22.

The device works as follows.

In the gap between the housing 1 and the reservoir 4, there is a U-shaped guide steel sheet 5, forming an external circulation loop in order.

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that in the wall of the dividing guide steel sheet 5 there is a hole 6 with a fan 2, and the opposite wall of the guide steel sheet 5 perfo (3Rirovan. The tank 4 is made double-walled, forming an internal circulation loop by the fact that in one of its inner wall there is a hole 14 with a fan 15, and the opposite wall 17 is perforated.

In the gap between the housing 1 and the reservoir 4, the gaseous thermostatic medium, mainly air, is cooled by means of a refrigerant evaporator or heated by a heater. The fan 7 moves the temperature medium. the flow of which is separated by the steel sheet 5 by means of its perforated wall 8 and deflecting visor 9, and a uniform split flow from all sides parallel to the walls of the tank 4 and the inner door 12. Due to the external circulation circuit, it is achieved The circulating medium only after the damping of the oscillations of the regulation process flows around the tank with the inner door 12, and a comprehensive energy exchange is carried out through the walls with also gaseous thermoetating media. th inner contour of the circulation. The fan 15 moves the thermoatating medium in the internal circulation circuit through the opening 14 of the inner wall of the tank 4 and the flow of the medium passes through. the perforated inner wall 17 into the inter-wall space of the reservoir 4. In the inter-wall space a directional flow is formed at a low speed. With such an arrangement of the external and internal circulation circuits, the separated flows of the thermostating medium move countercurrent along the walls of tank 4 that divide them. Thanks to this thermostatic scheme adopted according to the invention, it became possible to operate the thermostatic system according to the required operation principle, i.e. in the temperature range from up to + 180 ° C, a sequential circuit consisting of several thermal resistances and heat capacities is eliminated and transformed

they are continuously emitted if they are honestly heat energy pulses of energy units, if they are; are the body 1 with the frame: 2 and the door 3, including the elements of the air control device of the device, and the reservoir 4 with its air guiding device under the influence of the passing thermostatic medium of the air, and that in the middle of the chamber a constant temperature of +0.1 K is reached, while by changing the direction of the air through the control of the damper 19, the thermo-inertness is reduced, and thus a high rate of temperature change is reached. by the temperature of the flow; The airborne injector vector of the internal reservoir of the reservoir 4 is completely shielded from the disturbing influences of the heat input and the heat losses resulting from the separation of the temperatures between the external temperature and the temperature of the internal capacitance of the reservoir 4, which can take high values, j Since there are no energy links in reservoir 4, and the walls are heat exchange surfaces, air circulates in it with a slight pressure loss and therefore requires only low power of the fan 15, as a result, the amount of heat introduced by the fan 15 is insignificant, and in combination with the internal cavity of the tank 4 shielded from disturbing effects, the temperature difference between the average temperature of the internal cavity of the reservoir 4 and the internal temperature of the tank the walls of tank 4 are so small that, near the temperature value equal to K K as a partial range of the entire temperature range, the upper limit value of relative humidity is reached, equal to 98%. At the same time, a small amount of heat, if it is introduced into the chamber by metered humid air of the humidification system, influences this relative humidity value. At the same time, the shielding of the internal cavity of the tank 4 causes a small local deviation of any temperature point related to temperature.

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round in the middle of the chamber is less than or equal to ± 0.2 K in the named partial range. The full effect of thermoiner days and heat capacity is achieved by the fact that reservoir 4 has only practically point contact with the body or the fact that thermal inertia due to heat conduction is greater than thermal inertia due to heat exchange through a thermostatic medium air. This is also a contribution to the overall result.

Since the total capacity of the thermostatic device with even higher quality parameters is at most about 1/3 of the heat capacity of devices with liquid thermostating, the energy consumption at the same rate of temperature change also decreases to 1/3. Both working conditions: heating (cooling), on the one hand, and regulation at a temperature of a given value, on the other hand, require an optimal principle of operation, especially at high rates of change, of effective thermodynamic matching. This is solved by the fact that the external and internal circuits of the circulation of the thermostating medium are divided or, depending on the operating state, are connected by means of a rotatable angle flap 19, made mainly with electromagnetic automatic control. When control is given by a temperature controller, which, with an adjustable distance from the set value of the parameter, gives a preliminary signal, and immediately the angle flap 19 switches to control the parameter values with a lower heating capacity (cooling, after the transition from high heating output) to cooling. the low angle flap 19 closes. At a higher rate of temperature change, the air flow in the external circulation loop, separated by the deflecting steel sheet 5, through the open angle flap 19 is directed to the tank 4 as. the partial flow and after passing through the reservoir 4 is again connected to the partial flow of the external circulation loop. The resulting decrease in thermal energy also reduces the

the temperature difference between housing 1 and reservoir 4 during heating / cooling, and the selected parameter value is reached faster. Thus, thermodynamic agreement with the working state is achieved. Functionally with automatic switching, the following are connected: at a high rate of change — high heating / cooling performance with an open angle flap 19; when adjusting the settable temperature values, the heating / cooling performance is lower with the angle damper closed.

The advantage of the test chamber is that the two separated endpoints

The circulation circuit for the gaseous thermostatic medium, mainly air, in the external circulation circuit and the internal circulation circuit is implemented directionally, which has not yet been used, and that both circulation circuits can be connected to each other. V

This makes it possible to simulate environmental parameters (temperature and humidity) over a wide operating range and with high accuracy, while achieving and maintaining these extreme climatic parameters is achieved in the shortest possible time with an economical expenditure of energy.

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Editor G. Gerber

Tehred M. Khodanych

Order 1484/38 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Proofreader O. Kundrik

Claims (1)

TEST CAMERA FOR SIMULATION OF ENVIRONMENTAL PARAMETERS, comprising a housing with a door suspended on a frame, a tank placed therein with a clearance, two fans, the first of which is installed in the tank, and the second in the gap, as well as the evaporator and heater located in the latter, characterized in that, in order to enable testing under extreme environmental conditions, the chamber is equipped with a U-shaped steel sheet installed in the gap and having edges adjacent to the frame and frame and an opening for the second fan, while the wall of the sheet, which is opposite to the installation of the ven- tilator, is perforated, the tank is equipped with a deflecting visor on the side of the perforated wall of the sheet and is double-walled, the outer wall of the tank having an angular damper, one of its inner walls is perforated, and the opposite one has an opening for installation in it with a gap of the first fan, and both fans are placed on the same shaft. about »SU„ „1386806 Ί