DE202008014474U1 - Air conditioning device for control cabinets - Google Patents

Abstract

Air conditioning device for control cabinets, where in a housing placed air conditioning device in structural proximity attached to a control cabinet and by means of the control cabinet pointing openings an air circulation between the cabinet and the air conditioning device is thereby enabled characterized in that the air conditioning device in three different Modes, which include an active cooling, a passive cooling and allow heating of the circulating air, can be operated.

Description

The The invention relates to an air conditioning device for Cabinets, which placed in a housing Air conditioning device in structural proximity to a control cabinet is attached and by means of the cabinet pointing openings an air circulation between the cabinet and the air conditioning device is possible, according to the preamble of Claim 1.

Out The prior art is a variety of air conditioning systems and equipment known, the cooling due to different physical principles and additionally various air conditioning control systems be set out.

The Utility Model DE 201 05 487 U1 discloses a refrigerator which can be operated in multiple modes to optimize efficiency. The air conditioning of rooms and in particular of cabinets is based on Peltier elements, wherein the cooling device consists of a forced-ventilated heat exchanger on the inside and the outside of the room to be air-conditioned and Peltier elements mounted therebetween. The cooling unit can be operated in three different cooling modes, whereby for each mode the interconnection of the Peltier elements with each other is changed, and the cooling unit is equipped with at least four individually connectable Peltier units, and the switching between the individual cooling modes depending on the ambient temperature is made.

A Variety of known air conditioners for control cabinets is operated on the basis of a compressor cooling. The control The compressor is either temperature-dependent or temperature and time dependent, the compressor switched off and on when reaching specified temperature values becomes. When combined with time-dependent control the on and off operation of the compressor is performed as a function of Temperature values within the control cabinet and at the same time Expiration of certain time intervals. This has a higher one Switching rates result, making the compressor even more frequent is turned off in the pure temperature-dependent control, but at the same time leads to higher temperature fluctuations in the interior of a control cabinet, as the compressor only after Expiration of a time interval to changed temperature conditions can react. This leads to an overly high rise or fall of the housing interior temperatures. At the same time, the compressor becomes so large in such control often turned on and off, that this is due to the constant Rotational forces to reduce the life of the compressor and the hose systems associated with the compressor leads. The average operating time of a compressor of about ten years, with frequent switching on and off and operation of the compressor at maximum level to two years decimated.

In the DE 692 23 460 T2 For example, there is described an operation control unit for air conditioners having a compressor which can be operated intermittently and has a variable operation frequency. The operation control is set such that an intended device responds to a difference between the ambient temperature and a set temperature to control the operating frequency of the compressor so that the temperature difference is decreased and the compressor is stopped when a smaller air conditioning load than the capacity of the Air conditioner is present at a minimum value of the operating frequency.

A another embodiment of the invention provides an inverter driven Compressor and a control device, which the minimum operating frequency of the compressor changes based on the outside air temperature. Consequently, a low-cost operation in the same Capacity can be achieved.

Around constantly air conditioning with the highest efficiency To achieve a third embodiment, a device for calculating the operating ratio of a compressor not only to select the minimum frequency, but also is used to correct the selected minimum frequency so that the operating ratio for the minimum frequency can be optimized. Consequently, not only minimum frequencies can be used be set, which optimal efficiencies corresponding to different Provide operating conditions, but it can also operating conditions are maintained, which suitable for the respective operating frequency to the Deterioration of efficiency as a result of a reduction to prevent the operating conditions.

In front especially in electrical cabinets located in electrical cabinets and electronic components, it is regarding the life and the Failure rate of components of utmost importance, that they are exposed to a constant temperature. cabinets can be inside and outside of buildings be placed. Switch cabinets of mobile systems are for example, mounted on rooftops and are there seasonally dependent Temperature fluctuations from -20 ° C to + 50 ° C exposed. Regardless of these temperatures, the Components in the control cabinets according to the manufacturer be exposed to a constant temperature.

Out the above, it is therefore the object of the present invention an air conditioning device for cabinets specify a constant temperature within the control cabinets provides and at the same time the operating costs for such air conditioning devices are minimized. In addition, a Scho voltage by the novel device the refrigeration compressor used and consequently an increase in the lifetime take place.

The Solution of the object of the invention is achieved by an air conditioning device for control cabinets according to the preamble of claim 1, wherein the dependent claims at least expedient embodiments and represent further education.

It is first of an air conditioning device for Cabinets are assumed which in a housing is placed. This is in close proximity to a control cabinet. By means of openings pointing to the control cabinet is an air circulation between the cabinet and the air conditioning device allows.

According to the invention the air conditioning device in three different working modes operate. It is an active cooling, a passive cooling and heating the circulating air.

The Different working modes are available depending on the cabinet Temperatures activated. For this purpose, a temperature sensor is first required to detect occurring temperature differences. Lie there, for the electrical cabinet located in the cabinet or electronic components harmful high indoor temperatures before, the active cooling mode is activated.

The Active cooling is done by a known compressor cooling reached. This will be a compressor, a condenser and a Evaporator needed.

The heated air from the cabinet passes through an opening in the upper area on the side of the cabinet facing the Housing of the air conditioning device in the housing. At the same time, the compressor cooling is needed Cooling air from an AC-powered fan in the lower area on the side facing away from the control cabinet through a cooling air inlet opening in the housing transported the air conditioning device.

Conveniently, is the cooling air inlet opening in this case with a Metal mesh filter provided to contain in the cooling air Dust particles to filters.

in the Compressor is the gaseous refrigerant through the compression initially heated very much. The gaseous Refrigerant is transported to the condenser where the absorbed compression heat in the condenser to the environment is delivered. In addition, in addition the heat of energy released, which free when condensing becomes. In this way, the refrigerant leaves the condenser in the liquid state and is transported in the direction of the evaporator. The heat of compression given off and energy heat leaves through an opening above the cooling air opening the air conditioning case.

The from the control cabinet into the housing of the air conditioning device transported air is by means of a DC-powered fan transported to the evaporator. There it evaporates from the condenser coming liquid refrigerant under the given Conditions, where the evaporator of the control cabinet incoming air withdraws heat, and thus cools the air.

The cooled air is passed through an opening after this process transported to the control cabinet on the side facing the control cabinet. This illustrated cycle is repeated then.

According to the invention in the stated compressor cooling a variable speed Compressor used. As a result, the compressor does not have to be as it was at the beginning be repeatedly turned on and off. The compressor speed becomes dependent on the cabinet interior temperature regulated. It avoids unnecessary turn-on and turn-off cycles and the operating time of the compressor extended, moreover a constant indoor temperature of the control cabinet is generated. An energy saving when cooling a cabinet goes with the use of an air conditioning device according to the invention associated with a variable speed compressor.

A sees another embodiment of the present invention that the AC-powered blower, which for transporting the cooling air into the housing the air conditioning device is used to a speed-controlled fan is.

The Blower is regulated so that a constant Temperature difference between the ambient temperature and the condensing temperature is reached. This leads to a lower power consumption of the compressor. A speed-controlled fan provides in addition to the reduced volume another energy saving potential represents.

Lying in the cabinet so low Temperatures that would damage the electrical or electronic components over a longer period of time, the mode "heating" is activated.

at This mode is the one from the control cabinet to the air conditioning device discharged cold air in turn transported to the area of the compressor. There is an AC powered heater, which heats the cold air. The air flow becomes, as already described with the mode active cooling, generated by a DC-powered fan.

The heated air leaves the air conditioning device through the already known from the active cooling mode opening on the side of the housing facing the cabinet.

At extremely low ambient temperatures in conjunction with warm cabinet interior temperatures or in the event of alarm conditions in the control cabinet activate the passive cooling mode.

at the activation of this mode, one in the housing of the Air conditioning device according to the invention located Throttle activated so that it assumes a position that achieved direct cooling of the cabinet with the ambient air becomes. In the operating modes active cooling and heating the throttle takes a vertical locked position so that no untreated ambient air in the air conditioning device can get. When running the passive cooling mode is the throttle from a DC or AC powered Motor driven and placed in a horizontal position.

In As a result, can through a first opening in the housing the air conditioning device, which is in the uppermost area on the side of the housing facing away from the control cabinet is the heated, discharged from the cabinet air be transported inside the housing and at the same time a second opening located underneath cold ambient air (Cooling air) transported in the air conditioning case become.

Conveniently, is the second opening with a pleated HEPA (High Efficiency Particulate Airfilter) filters provide dust particles to filter out of the ambient air.

The Cool ambient air is supplied by means of a DC power supply Blower transported towards the evaporator, where the known cooling air outlet opening is located.

Of the described operating mode is another option the compressor as gently or as often as possible not having to use it and thereby saving energy.

The inventive air conditioning device has furthermore via an emergency power system, which preferably provided in the form of batteries.

In another embodiment are all or individual Blower of the air conditioning device as speed-controlled Blower trained.

At the Start of the air conditioning device or the compressor cooling is provided, the compressor initially at a low To operate speed. So the speed is first throttled and can after the device "booted" has been gradually increased. With this approach suddenly occurring power consumption peaks are avoided.

additionally the air conditioning device has a hydrogen or a gas level sensor, in the event of a limit violation with respect to the existing Hydrogen or other gaseous substances the mode Activate passive cooling. After activating the mode the throttle valve is brought into a horizontal position so that the one in the control cabinet and in the air conditioning housing Air together with the pollutants flow to the outside can and fresh ambient air in the air conditioning device can get.

A Another embodiment of the present invention provides a Fire or smoke sensor in front. In case of fire or smoke is First, the throttle valve placed in a vertical position, if this should be in a horizontal position. Thus, will Prevents fresh air from possibly causing a fire or smoke even faster. In addition, all blowers and components of the air conditioning device out of service taken to stifle the fire and spread the flames or the smoke.

The According to the invention air conditioning device designed so that a commissioning of several related Air conditioning devices is possible. When used a plurality of devices provides an air conditioning device Master air conditioning device, which is the operating mode of the remaining slave air conditioning devices.

The Invention will be described below with reference to several embodiments and explained in more detail with the aid of figures become.

there demonstrate:

1 a spatial representation of the air conditioning device according to the invention;

2 a representation of the air conditioning device with closed throttle and

3 a representation of the air conditioning device with the throttle open.

As in 1 illustrated, the air conditioning device is in a housing which has two openings on the side facing the cabinet. As a result, a circulating air flow can occur, which is transported back and forth between the control cabinet to be air-conditioned and the air-conditioning system.

The air to be cooled or heated first passes through an opening 1 in the upper part of the air conditioning case. At the same time, the cooling air required for compressor cooling is supplied by an AC-powered fan 2 in the lower area on the side facing away from the cabinet by a cooling air inlet opening 3 transported into the housing of the air conditioning device.

The Cooling air inlet opening is here with a Metal mesh filter provided to contain in the cooling air Dust particles to filters.

In variable speed compressor 4 the gaseous refrigerant is initially heated very strongly by the compression. The gaseous refrigerant becomes the condenser 5 transported, where the absorbed compression heat in the condenser 5 is delivered to the environment.

The refrigerant leaves the condenser 5 in the liquid state and is in the direction of the evaporator 6 transported. The released heat of compression and energy heat leaves through an opening 7 above the cooling air opening 3 the air conditioning case.

The transported from the cabinet into the housing of the air conditioning device is air by means of a DC-powered fan 8th to the evaporator 6 transported. There it evaporates from the condenser 5 coming liquid refrigerant under the given conditions, the evaporator 6 The air coming from the cabinet removes heat and cools the air.

The cooled air becomes after this process through an opening 9 transported to the control cabinet on the side facing the control cabinet. This illustrated cycle then repeats itself.

The fan 2 is designed in this embodiment as a speed-controlled fan. The fan 2 is regulated in such a way that a constant temperature difference between the ambient temperature and the condensation temperature is achieved. This leads to a reduced condensation pressure and consequently to a lower power consumption of the variable-speed compressor 4 ,

In 2 is the air conditioning device according to the invention with the throttle closed 10 shown. The throttle 10 is closed during active cooling and heating modes. In the 2 shown arrows indicate the air flow during the heating mode. The air flows through the housing opening 1 in the air conditioning device and is by means of the blower 8th in the direction of the evaporator 6 transported. In this area is a heater 11 , which heats the air flowing through. The heated air leaves through the housing opening 9 the air conditioning device and is transported back into the cabinet.

In 3 becomes the air conditioning device with the throttle open 10 shown. The throttle 10 takes this position z. B. in the operating mode passive cooling or possibly occurring interference. The throttle 10 is from a motor 12 driven. The arrows shown represent the air flow during the operating mode passive cooling. The air flowing out of the control cabinet is first of all passed through the housing opening 1 transported into the air conditioning device. Due to the horizontal position of the throttle 10 becomes the way to the blower 8th obstructed, allowing the air in the direction of the housing opening 13 flows and there flows out of the air conditioning device.

At the same time cool ambient air flows through a cooling air inlet opening 14 on the side facing away from the cabinet side of the air conditioning case in the device, the ambient air is first a HEPA filter 15 must happen. The cleaned air then flows into a chamber and from there in the direction of the known blower 8th ,

Through the housing opening 9 the air conditioning device, the cool and filtered ambient air is discharged into the cabinet.

1

housing opening

2

fan

3

Cooling air inlet port

4

variable speed compressor

5

capacitor

6

Evaporator

7

housing opening to deliver the heat of compression

8th

fan

9

housing opening for the delivery of conditioned air

10

throttle

11

heater

12

throttle motor

13

housing opening for discharging the air transported from the control cabinet

14

Cooling air inlet port

15

HEPA filter

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 20105487 U1 [0003]
• - DE 69223460 T2 [0005]

Claims (28)

Air conditioning device for cabinets, wherein the air conditioning device placed in a housing is mounted in close proximity to a control cabinet and air circulation between the cabinet and the air conditioning device is enabled by means of cabinet openings, characterized in that the air conditioning device in three different modes, which an active cooling , Allow passive cooling and heating of the circulating air, can be operated. Air conditioning device according to claim 1, characterized characterized in that one, located in the cabinet electrical or electronic components harmful high Interior temperature of the active cooling mode is activated. Air conditioning device according to claim 1 or 2, characterized in that the active cooling by a compressor cooling with the aid of a compressor ( 4 ), a capacitor ( 5 ) and an evaporator ( 6 ) is realized. Air conditioning device according to claim 3, characterized in that a variable-speed compressor ( 4 ) is used. Air conditioning device according to claim 4, characterized characterized in that the compressor speed in dependence the cabinet interior temperature of the device is controlled. Air conditioning device according to one of claims 3 to 5, characterized in that the required evaporator air flow through a DC-powered fan ( 8th ) is produced. Air conditioning device according to one of claims 3 to 6, characterized in that the required condenser air flow through an AC-powered fan ( 2 ) is produced. Air conditioning device according to claim 7, characterized in that it is in the blower ( 2 ) is a speed-controlled fan. Air conditioning device according to claim 8, characterized in that the fan ( 2 ) is controlled so that a constant temperature difference between the ambient temperature and the condensing temperature is achieved. Air-conditioning device according to one of the preceding claims, characterized in that the ambient air required for the compressor cooling via a cooling air inlet opening ( 3 ) enters the device housing. Air conditioning device according to claim 10, characterized in that the cooling air inlet opening ( 3 ) is provided with a metal mesh filter. Air conditioning device according to one of the preceding Claims, characterized in that at one, for Electrical or electronic components in the control cabinet harmful low indoor temperature of the mode warming is activated. Air-conditioning device according to one of the preceding claims, characterized in that in the heating mode, the air flow in the air-conditioning device is controlled by an AC-powered heater ( 11 ) is heated and through an opening facing the cabinet ( 9 ) is transported to the control cabinet. Air conditioning device according to claim 13, characterized in that the air flow through a DC-powered fan ( 8th ) is produced. Air conditioning device according to one of the preceding Claims, characterized in that at extremely low ambient temperatures or alarm conditions in the Cabinet the mode passive cooling is activated. Air conditioning device according to one of the preceding claims, characterized in that when activating the passive cooling mode located in the housing of the air conditioning device throttle ( 10 ) is activated and this occupies a position, so that a direct cooling of the cabinet with the ambient air is achieved. Air-conditioning device according to claim 16, characterized in that the throttle valve ( 10 ) from a DC-powered or AC-powered engine ( 12 ) is driven. Air conditioning device according to claim 16 or 17, characterized in that the air flow from a DC-powered blower ( 8th ) is produced. Air conditioning device according to one of claims 16 to 18, characterized in that the cooling air inlet opening ( 14 ) with a pleated HEPA filter ( 15 ) is provided. Air conditioning device according to one of claims 16 to 19, characterized in that the throttle valve ( 10 ) assumes a blocking position in the modes active cooling and heating, so that no untreated ambient air enters the air conditioning device. Air conditioning device according to one of the preceding Claims, characterized in that the device via an emergency power system has. Air conditioning device according to claim 21, characterized in that the emergency power system is batteries is. Air-conditioning device according to claims 6, 14 or 18, characterized in that the fan ( 8th ) is a speed-controlled fan. Air-conditioning device according to one of claims 3 to 23, characterized in that the compressor ( 4 ) is initially operated at a low speed when activated in order to subsequently increase the speed step by step. Air conditioning device according to one of the preceding Claims, characterized in that in the air conditioning device a hydrogen or a gas level sensor is provided to in If the limit value is exceeded, the passive cooling mode to activate. Air-conditioning device according to one of the preceding claims, characterized in that a fire or smoke sensor is provided in the air-conditioning device in order, in the case of a fire or smoke, to open the throttle valve ( 10 ) and switch off all blowers and components. Air conditioning device according to one of the preceding Claims, characterized in that the air conditioning device has an alarm system which is too high or too low Operating temperatures, in case of component failure, the power supply or the heating function emits a warning signal. Use multiple air conditioning devices according to one of claims 1 to 27, characterized that one of the air conditioning devices acts as a master air conditioning device and sets the operation mode of the slave air conditioning devices.