AU2019239363A1

AU2019239363A1 - Condenser system having automatic detection and automatic de-icing functions

Info

Publication number: AU2019239363A1
Application number: AU2019239363A
Authority: AU
Inventors: Min Zhu
Original assignee: Nanjing Nenzhi Electronics Technology Co Ltd
Current assignee: Nanjing Nenzhi Electronics Technology Co Ltd
Priority date: 2018-03-22
Filing date: 2019-03-19
Publication date: 2020-01-30
Anticipated expiration: 2039-03-19
Also published as: AU2019239363B2; CN208012210U; WO2019179405A1

Description

Background Art

Electronic dehumidifier adopts semiconductor refrigeration technology. By the operation of semiconductor chilling plates with power on, temperature of the condenser close to the refrigeration surface is rapidly reduced. When the external humid air sucked by the axial flow fan passes through the condenser, the moisture contained therein condenses and accumulates on the surface of the condenser due to temperature difference, drips into the catch basin under the action of gravity, and is then drained out via the drain pipe.

Since electronic dehumidifier does not use compressor, has no huge pipes and radiator, and does not need to add refrigerant, it can be compact with low power consumption, low noise, high reliability and high efficiency, thus one or more units can be used in various new energy, power and communication equipment such as frequency conversion cabinets, electrical control cabinets, small storage cabinets, box-type transformer substations, etc., which have small space and high requirements for humidity control, to reduce humidity in the cabinets, reduce salt-spray corrosion, avoid condensation on surfaces of electronic components, reduce the risk of short circuit and high voltage breakdown of components, as well as prolong the service life of equipment.

However, some problems have been found in the actual use, among which the most important one is the icing problem of condenser. Since that during the operation of semiconductor chilling plate, the temperature on cold surface can be as low as -55°C, temperature of the condenser is always 15-20°C lower than the ambient temperature, which means when the ambient temperature is lower than 10°C, temperature of the condenser will be between -5°C and -15°C, thus the surfaces will ice gradually; once this starts, if the condenser continues the operation, along with the increase of condensed water, the ice layer will become thicker and finally wrap the whole condenser, making it losing the condensing

107705AUP00 function, thus the electronic dehumidifier will loss its ability of dehumidification. The traditional method is to reduce the power of the chilling plate when the ambient temperature is detected to be lower, shut down the chilling plate when the condenser temperature is detected to be lower than the freezing point, and resume operation when the ice on the chilling plate melts naturally. This method has effect when the ambient temperature is above 10°C, and is almost ineffective when the ambient temperature is below 0°C.

As China is vast in territory, frequency conversion cabinets such as those for wind power generation are applied in northwest regions such as Xinjiang where are hot and dry, in places such as Hainan where are hot and humid, and in northern regions where are cold, with temperature ranging from-30°C to 70°C, thus putting forward higher working environment requirements for dehumidifiers.

Contents of Utility Model Invention.

Aiming at the above mentioned problem, this utility model invention provides a condenser system with automatic detection and automatic deicing functions, which can adapt to a working environment temperature of -30°C-60°C, and can reliably perform condensation dehumidification under various air temperatures.

To solve the above mentioned problem, this utility model adopts the following technical solution: this utility model provides a condenser system with automatic detection and automatic deicing functions, characterized by: it comprises condenser control circuit board, condenser, drainage device, deicing heater and sensor part; the said condenser comprises baseplate and condensing fins; the said sensor part comprises a temperature and humidity sensor which is fixed on the baseplate between condenser fins; the drainage device is arranged at the lower part of condenser, with condensing fins stretching into it; the deicing heater is inserted between two condensing fins; the condenser control circuit board is integrated on the control main board of the dehumidifier.

As another embodiment of this utility model, the said sensor part also includes light control sensor which is set on the dehumidifier control panel and can be used for determination of icing thickness.

As another embodiment of this utility model, the said sensor part also includes electromagnetic pickup sensor which is set between two condenser fins, together with electromagnetic pickup reed; the electromagnetic pickup sensor is used to determine whether it is ice or frost.

As the preferred embodiment for this utility model, the said temperature and humidity

107705AUP00 sensor adopts ring hole type and can be connected to original cut-out of the condenser with screws, thus reduce the cost and time required for condenser preparation process.

As further limitation to this utility model, the said deicing heater includes PTC ceramic heater, hollow T-shaped aluminum alloy heat conductor, wire, waterproof plugging cap; the PTC ceramic heater is installed in hollow T-shaped aluminum alloy heat conductor; the wire used is silica gel temperature resistant waterproof wire; two ends of the hollow aluminum alloy heat conductor are inserted with the waterproof plugging caps and sealed with 450°C temperature resistant waterproof structure adhesive. Both ends of the said hollow T-shaped aluminum alloy heat conductor are cushioned with red copper sheet I; the hollow T-shaped aluminum alloy heat conductor is tightly inserted in between two condensing fins; bottom of the hollow T-shaped aluminum alloy heat conductor is cushioned with red copper sheet II and the bottom is connected with baseplate; the wire is connected to the relay on the main board of dehumidifier. This deicing heater has excellent waterproof and strong deicing ability.

The said drainage device includes basin with PU drain pipe.

As another embodiment of this utility model, PTC heater is installed on the basin, so as to adapt to the low temperature working environment and prevent condensed water from being frozen again and blocking the drain pipe when being discharged.

As another embodiment of this utility model, ribbon heater is added outside the PU drain pipe, with temperature resistant insulating pipe wrapping on the outer wall. Thus to further adapt to the low temperature working environment and prevent PU drain pipe from being frozen.

As the preferred embodiment for this utility model, the said condenser is made of 6063 aluminum alloy integrally; its lower end is made with a 45° cutting tip to facilitate the condensed water to drip into the drain tank.

As further limitation to this utility model, the said condenser has platform hole on base plate for installation of screws used to pressing out chilling plates, so as to make the cold surface of chilling plate cling to the baseplate of condenser.

The said control circuit board of condenser is programmable, for which the operation process can be set according to different environments, endowing environmental adaptability to the condenser system.

The application of this utility model condenser on electronic dehumidifier has the

107705AUP00 following performance advantages:

> Endowing the electronic dehumidifier with all-weather use capability in a wide climatic zone of-30°C~70°C.

2, Greatly improving the lower temperature working capability of dehumidifier and thoroughly changing the problem of icing of previous electronic dehumidifier. At low temperatures, freezing of condenser is inevitable. In fact, the ice on the condenser is converted by the condensed water. As long as the ice is removed, the dehumidifier will still have strong dehumidification capability at low temperatures.

> The condenser adopts integrated design with small volume and reasonable layout, thus is convenient for installation. The PTC heating device is set in specifically designed aluminum alloy fully enclosed conductor, thus has good waterproof performance, and also greatly improved service life.

4> The condenser can be equipped with multiple sensors, selected according to different requirements; the main board can be controlled by programming, greatly improving the environmental adaptability of the condenser system.

Description of Drawings

Fig. 1 shows the schematic diagram for the structure of condenser system with automatic detection and automatic deicing functions.

Fig. 2 shows the schematic diagram for the structure of the deicing heater of the condenser system.

Fig. 3 shows the schematic diagram of drainage device of the condenser system.

Fig. 4 shows the schematic diagram of hollow T-shaped aluminum alloy heat conductor of the condenser system.

Wherein, 1 is the control circuit board of condenser, 2 is the condenser, 3 is drainage device, 4 is the deicing heater, 5 is the temperature and humidity sensor, 6 is the light control sensor, 7 is electromagnetic sensor, 8 is the reed and 9 is basin;

2- 1 is the baseplate, 2-2 is condensing fin, 2-1-1 is platform hole;

3- 1 is PU drain pipe, 3-2 is basin, 3-3 is PTC heater, 3-4 is ribbon heater, 3-5 is insulating pipe;

4- 1 is PTC ceramic heater, 4-2 is hollow T-shaped aluminum heat conductor, 4-3 is wire,

107705AUP00

4-4 is waterproof plugging cap, 4-5 is red copper sheet I, 4-6 is red copper sheet II.

Embodiments of the Invention

The following contents, together with attached diagrams, describe the utility model invention in further details.

As shown in Fig. 1, this utility model provides a condenser system with automatic detection and automatic deicing functions, including control circuit board 1 of condenser, condenser 2, drainage device 3, deicing heater 4, sensor part;

The said condenser 2 is made of 6063 aluminum alloy integrally. It includes the baseplate 2-1 and condensing fin 2-2; there are four platform holes 2-1-1 on the baseplate for installation of screws used to pressing out chilling plates, so as to make the cold surface of chilling plate cling to the bottom of condenser. Fower end of the condenser is made with a 45° cutting tip to facilitate the condensed water to drip into the drain tank.

Sensor part: used to collect condition information on the condenser and send signals to the condenser control circuit board 1, so that the dehumidifier can adopt corresponding working condition. The said sensor includes temperature and humidity sensor 5, light control sensor 6 and electromagnetic pickup sensor 7; so it can conduct single or combined judgment on icing condition of condenser, so as to determine whether deicing is required.

Single judgment is made according to the temperature and humidity. For example, when the temperature is below 0°C and the humidity is 100%, we can judge that there is icing. Since the condenser control circuit board 1 is programmable, we can set the start point of deicing at any temperature below zero and deicing duration at random.

Detection values of temperature and humidity can be used to determine whether it is icing but not whether it is ice or frost, as well as the hardness and thickness of ice. Icing of condenser of dehumidifier starts from frosting, which then changes into hard ice gradually.

The condenser can continue its operation at the beginning of frosting. It is only when the condensing fin 2-2 are completely covered by ice that the condensing ability is lost.

Therefore, if it is required to judge the icing thickness accurately, it can be fulfilled by the light control sensor 6 on the main board according to a principle that: the light control sensor emits infrared light to condensing fin 2-2. If it is not blocked, it can be judged that the ice is not too thick; if it is blocked, there is ice layer existing. Electromagnetic pickup sensor 7 has 5

107705AUP00 an electromagnetic pick reed 8 installed between two condensing fins 2-2; if there is no ice or there is only frost, the red 8 can pick up and flick normally; when it is covered with hard ice, the reed 8 cannot flick, indicating that it is hard ice not frost. In actual application, considering the manufacturing cost, only the temperature and humidity sensor 5 is required generally.

The temperature and humidity sensor adopts ring hole type and is fixed on the baseplate between condenser fins with stainless steel screws.

The said light control sensor 6 is set on outer wall of condenser. The said electromagnetic pickup sensor 7 is set between to condenser fins.

As shown in Fig. 2, the said deicing heater 4 includes the PTC ceramic heater 4-1, hollow T-shaped aluminum alloy heat conductor 4-2, wire 4-3, waterproof plugging cap 4-4; wherein the PTC ceramic heater 4-1 adopts a temperature of 200 °C and a power under 24V of 100W. The PTC ceramic heater 4-1 is installed in hollow T-shaped aluminum alloy heat conductor 4-2 (as shown in Fig. 4); the wire 4-3 used is silica gel temperature resistant waterproof wire; two ends of the hollow T-shaped aluminum alloy heat conductor are inserted with the waterproof plugging caps 4-4 and sealed with 450 °C temperature resistant waterproof structure adhesive. Both ends of the said hollow T-shaped aluminum alloy heat conductor 4-2 are cushioned with red copper sheet I 4-5, so that the hollow T-shaped aluminum alloy heat conductor 4-2 can be tightly inserted in between two condensing fins

2- 2; bottom of the hollow T-shaped aluminum alloy heat conductor 4-2 is cushioned with red copper sheet II 4-6 and connected with the condenser baseplate 2-1 with stainless steel screws the wire 4-3 is connected to the relay on the main board of dehumidifier. When the sensor detects icing, the heating and deicing function can be started according to the preset setting. According to the test, the PTC heater has good waterproof and strong deicing capability, and deicing can be set at an interval of 4-6 hours at low temperature, 3 min each time.

As shown in the Fig. 3, condensed water from the condenser shall be drained out from the cabinet by drainage device; the said drainage device includes the basin 3-2 (in aluminum alloy) with PU drain pipe 3-1; to adapt to the low temperature working environment and prevent condensed water from being frozen again, PU drain pipe 3-1 is plugged, PTC heaters

3- 3 (30W*2) are installed on two sides of the basin 3-2; corresponding low temperature

107705AUP00 startup temperature and heating time can be set; the PU drain pipe 3-1 is equipped with ribbon heater 3-4 outside and wrapped with temperature resistant insulating pipe 3-5.

The condenser control circuit board 1 is integrated on the main board of dehumidifier, adopting programmable control. When it detects that the condenser is icing and requiring deicing, the control part shuts down the chilling plate and dehumidifier fan, then starts up the deicing heater 4; when the set heating time is reached, it stops heating, power off the deicing heater 4, then starts up the chilling plate and dehumidifier fan again.

All the above mentioned are preferred embodiments of this utility model only, not limited to this utility model; for technicians in this field, this utility model can have various modifications and variants. Any modification, equivalent replacement, improvement and so on made within the spirit and principles of this utility model shall be included within the scope of the claims of this utility model.

Claims

CLAIMS:

1. A condenser system with automatic detection and automatic deicing functions, characterized by: it comprises condenser control circuit board, condenser, drainage device, deicing heater and sensor part; the said condenser comprises baseplate and condensing fins; the said sensor part comprises a temperature and humidity sensor which is fixed on the baseplate between condenser fins; the drainage device is arranged at the lower part of condenser, with condensing fins stretching into it; the deicing heater is inserted between two condensing fins; the condenser control circuit board is integrated on the control main board of the dehumidifier.
2. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said sensor part also includes light control sensor which is set on the dehumidifier control panel.
3. Condenser system with automatic detection and automatic deicing functions as described in Claim 1 or 2, characterized by: the said sensor part also includes electromagnetic pickup sensor which is set between two fins of the condenser, together with electromagnetic pickup reed.
4. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said temperature and humidity sensor adopts ring hole type.
5. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said deicing heater includes PTC ceramic heater, hollow T-shaped aluminum alloy heat conductor, wire, waterproof plugging cap; the PTC ceramic heater is installed in hollow T-shaped aluminum alloy heat conductor; the wire used is silica gel temperature resistant waterproof wire; two ends of the hollow aluminum alloy heat conductor are inserted with the waterproof plugging caps and sealed with 450 °C

107705AUP00 temperature resistant waterproof structure adhesive.
6. Condenser system with automatic detection and automatic deicing functions as described in Claim 5, characterized by: both ends of the said hollow T-shaped aluminum alloy heat conductor are cushioned with red copper sheet I; the hollow T-shaped aluminum alloy heat conductor is tightly inserted in between two condensing fins; bottom of the hollow T-shaped aluminum alloy heat conductor is cushioned with red copper sheet II and connected with baseplate; the wire is connected to the relay on the main board of dehumidifier.
7. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said drainage device includes basin with PU drain pipe; PTC heater is installed on the basin; ribbon heater is added outside the PU drain pipe, with temperature resistant insulating pipe wrapping on the outer wall.
8. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said condenser is made of 6063 aluminum alloy integrally; the condenser has a 45° cutting tip at its lower end.
9. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said condenser has platform hole on base plate.
10. Condenser system with automatic detection and automatic deicing functions as described in Claim 1, characterized by: the said control circuit board of condenser is programmable.