WO2008071048A1

WO2008071048A1 - A cabinet

Info

Publication number: WO2008071048A1
Application number: PCT/CN2007/001304
Authority: WO
Inventors: Puyang Chen; Yan Xu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-12-13
Filing date: 2007-04-20
Publication date: 2008-06-19
Also published as: CN200994229Y

Abstract

A Cabinet in which a device room (A), a negative-pressure room (C) and a mixing room (B) are set. One or more heat emission components (2) could be arranged in the device room (A). The mixing room (B) is set in a side of the cabinet body (1), and on the mixing room (B) there are a reflux air opening (4) and an air inlet (10). A part of hot air from the device room (A) is discharged, and the other flows from the reflux air opening (4) into the mixing room (B) through a reflux air adjusting valve (5), and is mixed with cold air from the air inlet (10). Then it is sucked into the negative-pressure room (C) and subsequently into device room(A) to cool the heat emission components (2). At least one dust removing apparatus is set on the cabinet body (1) relative to the mixing room (B). The dust removing apparatus comprises a dust collecting board (6) which is set on the inner side of the cabinet body (1) and inclines upwardly. A dust removing opening (8) is set on the cabinet body under the slope formed by the dust collecting board (6). Dusts could slide down along the slope and be discharged through the dust removing opening (8). The cabinet is fit for both outdoor cabinet and indoor cabinet.

Description

Cabinet

Technical field

The present invention relates to a cabinet, and more particularly to a cabinet that is suitable for outdoor or harsh environments and has good environmental adaptability. Background of the invention

At present, with the development and popularization of communication technologies, the installation environment of communication equipment is moved outward from a computer room with a strict air-conditioning environment, and may be installed in a humid environment with high dust and salt spray concentration. Operating in a harsh environment, the circuit board of the communication device is prone to corrosion, affecting the communication quality and even interrupting the communication service, affecting the communication service, and increasing the maintenance cost of the operator.

Enhancing the environmental adaptability of outdoor installation equipment, in the final analysis, is to reduce the relative humidity and dust pollution on the surface of the circuit board inside the equipment. The current method is mainly to use a heat exchange radiator to isolate environmental pollution and humid ambient air, so that the communication equipment is protected from environmental pollution and high relative humidity.

Or, use the air conditioning system attached to the equipment to isolate environmental pollution and reduce the relative humidity inside the communication equipment through the dehumidification of the air conditioner; protect the communication equipment from environmental pollution and high relative humidity.

All of the above measures are to increase manufacturing costs and operating costs, and to increase energy consumption, and the increase in consumable parts also increases the chance of communication equipment failure.

As shown in FIG. 1 , it is a technical solution of the prior art 1 - an outdoor cabinet for a refrigerating air conditioner:

This is the first outdoor cabinet with high environmental adaptability. It completely isolates the circuit board inside the equipment from the outside world. The dust in the environment will not touch the circuit board, thus eliminating the pollution impact. On the other hand, the refrigeration unit The generated cold air exchanges heat with the hot air generated by the heating of the circuit board to reduce the temperature. At the same time, the refrigeration unit can remove the moisture in the closed cabinet during cooling, thereby reducing the relative humidity in the cabinet, thereby giving the circuit board Provides a non-polluting, low relative humidity operating environment to avoid corrosion of the board caused by environmental corrosion.

However, in the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: The refrigeration air-conditioning unit of this structure is expensive, the manufacturing cost of the equipment is reduced, and the reliable operation life of the refrigeration and air-conditioning unit is short, once damaged. In the event of the loss of the ability to cool the board, the electronic equipment may stop functioning, or even burn out, and does not meet the technical requirements for long-term reliable operation.

In addition, the refrigeration air conditioner operates continuously, consumes a lot of power, is not conducive to environmental protection, energy saving and consumption reduction concept, is not suitable for installation in places without AC power supply, and is not suitable for installation in a power supply network with low AC supply voltage (cooling) The air conditioner does not operate normally. Moreover, the weight of the refrigeration unit is large, which increases the total weight of the equipment and is not conducive to handling. Long-term operation will also accumulate ash at the cooling fins, affecting heat exchange efficiency and reducing cooling capacity.

As shown in FIG. 2, it is a technical solution of the prior art 2: a heat exchange heat dissipation outdoor cabinet:

This is a commonly used high-environment outdoor cabinet that completely isolates the circuit board inside the device from the outside world. The dust in the environment does not touch the circuit board, so the pollution effect is also eliminated; the hot air generated by the closed cabinet is circulated by the hot air fan, and the heat is transferred to the heat exchange fins, and the heat of the heat exchange fins is transferred to the cold air. The airflow, cold airflow is circulated by the cold air fan to maintain the sealed equipment chamber within a set temperature range.

In the process of implementing the present invention, the inventors found that at least the following problems exist in the prior art two:

In such a cabinet, the heat exchanger group must use a high-power hot air fan and a cold air fan, which are expensive and costly to manufacture. Moreover, the heat exchanger group runs continuously, consumes a large amount of power (even greater than the power consumption of the electronic equipment), and is not suitable for installation in a place where there is no AC power supply (the communication equipment in some places can only provide a small load power supply by the solar battery power supply system) ), and the heat exchanger group has a large weight, which increases the total weight of the equipment, which is not conducive to handling.

In addition, the cold air suction port is lower, and the section with the highest natural dust concentration will accumulate ash on the cooling fins for a long time, which will affect the heat exchange efficiency and reduce the ability to cool the hot air.

Both the prior art 1 and the prior art 2 are series reliability design, and the cooling function is composed of a single non-backup unit, and the product reliability is low. Summary of the invention

The purpose of embodiments of the present invention is to provide a cabinet that has low energy consumption, good heat dissipation effect, and is effective in dustproof and anticorrosive.

The purpose of the embodiment of the present invention is achieved by the following technical solutions:

The cabinet of the present invention includes a cabinet body, and a heating element can be disposed in the cabinet body, wherein the cabinet body is provided with a equipment compartment and a mixing chamber, and the heating element can be disposed in the equipment compartment.

A through hole is arranged between the equipment compartment and the mixing chamber, and a communicating back air hole is further disposed between the equipment compartment and the mixing chamber, and part of the hot air in the equipment compartment can enter the mixing chamber from the return air hole, and the mixing chamber After the cold air is mixed, it enters the equipment compartment from the through hole.

It can be seen from the above technical solution provided by the present invention that the cabinet of the present invention has a return air hole communicating with the upper portion of the mixing chamber. After the gas in the equipment compartment cools the heating element, a part of the hot air is discharged to the outside, a part enters the mixing chamber and is mixed with the cold air in the mixing chamber, and the mixed gas enters the equipment compartment to continue cooling the heating element.

On the one hand, cold air can effectively cool the equipment. On the other hand, hot air can reduce the relative humidity of the cooling gas. Low energy consumption, good heat dissipation, and effective dust and corrosion protection.

Especially suitable for electrical communication equipment cabinets, but also for other equipment cabinets. It can be used in outdoor cabinets or in indoor cabinets. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural view of an air conditioning refrigeration cabinet of the prior art; 2 is a schematic structural view of a heat exchange cabinet of the prior art 2;

3 is a schematic structural view of a cabinet of the present invention;

Figure 4 is a schematic structural view of a dust removing device of the present invention;

Figure 5 is a flow chart of the cabinet cooling gas circulation of the present invention. Mode for carrying out the invention

A preferred embodiment of the cabinet of the present invention is shown in FIG.

Including the cabinet 1, the heating element 2 can be arranged in the cabinet 1, the equipment compartment A and the mixing chamber B are arranged in the cabinet 1, and the equipment compartment A is connected with the mixing chamber B. The specific structure is that the equipment warehouse A and the mixing chamber B are arranged side by side. Arranged, the equipment compartment A and the lower part of the mixing chamber B are in communication with each other, the upper part is also in communication with each other, and the equipment compartment A and the mixing chamber B are both open to the outside, so that the equipment compartment A and the mixing chamber B form a semi-closed circulation system. The heating element 2 can be disposed in the equipment compartment A. After the gas in the equipment compartment A cools the heating element 2, a part of the hot air is discharged outside, and a part of the hot air is mixed into the mixing chamber B and mixed with the cold air entering the mixing chamber B. The mixed gas enters the equipment compartment A to continue cooling the heating element 2, and the above process is repeated. On the one hand, cold air can be used to effectively cool the equipment, and on the other hand, the reuse of hot air can reduce the dust content and relative humidity in the cooling gas. The heating element 2 herein may be an electronic device such as a circuit board or a communication device, or other device. The device compartment A may be provided with a plurality of insertion frames, and the heating element 2 may be inserted into the insertion frame.

In the above cooling cycle process, the cooling capacity is strong due to the entry of cold air. The cold air mentioned here is the natural air in the environment. If the heat consumption of the heating element is small, the self-circulation method can be adopted.

In most cases, fan circulation is required. At this time, a negative pressure chamber C is preferably provided between the equipment compartment A and the mixing chamber B in the cabinet 1, and the negative pressure chamber C is communicated with the equipment compartment A and the mixing chamber B, respectively. The specific structure is that the negative pressure chamber C and the equipment chamber A are arranged up and down, and are connected to each other; the mixing chamber B is disposed on one side of the negative pressure chamber G and the equipment chamber A, and the lower portion of the mixing chamber B is communicated with the negative pressure chamber C, mixing The upper portion of the chamber B communicates with the equipment compartment A. A plurality of fans 3 are disposed between the negative pressure chamber C and the equipment compartment A. The fan 3 draws the gas in the negative pressure chamber C into the equipment compartment A, and forms a negative pressure in the negative pressure chamber C, and the mixing chamber B is The mixed gas inside is sucked into the negative pressure chamber C. Compared with the prior art, the fan 3 used in the present invention can adopt a small power fan to reduce the energy consumption of the device. It is possible to provide only one fan 3, preferably a plurality of fans 3 are connected in parallel, and 3 are shown in FIG. The fans 3 are arranged side by side, and may be other numbers of fans 3 as needed, so that when one of the fans fails, the operation of the device is not affected, and reliability is increased.

The mixing chamber B is disposed in a chamber of the cabinet 1, and the upper portion of the mixing chamber B is provided with a return air hole 4, and part of the hot air in the equipment chamber A enters the mixing chamber B from the return air hole 4. Preferably, a return gas regulating valve 5 is provided at the return vent 4 for adjusting the amount of return gas as needed to accommodate different environments and heating elements. The upper portion of the mixing chamber B is also provided with a venting port 10 from which cold air enters the mixing chamber B and is mixed with hot air. The research shows that: the dust in the air accounts for about 80% of the weight floating in the height range of 1 meter from the ground. Therefore, the height of the air outlet 10 for collecting natural cold air is preferably more than 1 meter from the ground. In practical applications, The cabinet sometimes needs to be set at a lower position, for example, directly on the ground. Therefore, it is required that the height of the air outlet 10 is as high as possible. The present invention is shown in FIG. 3, and the air outlet 10 is provided. In the upper part of the mixing chamber B, it is ensured that the air outlet 10 is still at a higher position when the cabinet position is lower.

The lower part of the mixing chamber B is provided with a hole communicating with the negative pressure chamber, but the hole is opened at a position higher than the bottom end of the mixing chamber B, so that when the mixed gas enters the negative pressure chamber C from top to bottom, the mixing chamber B The gas at the bottom is always relatively calm, and dust from the mixed gas deposits there, forming a dust trap.

The bottom of the mixing chamber B is provided with a dust removing port 8, and the dust removing port 8 is provided with a dust removing plate 9. The dust pumping plate 9 can be opened periodically to clean up the dust.

Two dust removing devices are also disposed on the side wall of the cabinet 1 corresponding to the mixing chamber B, and one or more dust removing devices may be provided. The specific structure of the dust removal device is shown in Figure 4:

The dust removing device comprises an upwardly inclined dust collecting plate 6 provided inside the cabinet 1. When the mixed gas enters the negative pressure chamber C from top to bottom, the dust hits the inclined surface formed by the dust capturing plate 6, and the cabinet 1 at the bottom of the inclined surface The dust discharge hole 7 is opened upward, and under the double action of the air flow and the slope, the dust can slide down the slope and be discharged from the dust discharge hole 7. A flashing plate 15 may be provided on the upper portion of the dust exhaust hole 7.

The exhaust port 12 is disposed at the upper portion of the equipment compartment A. It is easier to discharge part of the hot air in the equipment compartment A from the exhaust port 12, and the exhaust port 12 is provided with an exhaust gas regulating valve 13 for adjusting the amount of exhaust gas. .

Further, the present invention is provided with a protective net 11 at the air intake port 10 to prevent entry of small animals, and also to prevent entry of other foreign matter, and a protective net 11 may be provided at the exhaust port 12.

As shown in Figure 5, the working principle of the present invention is:

The fan 3 works to blow up a negative pressure chamber to generate a negative pressure - inhaling the mixed cooling gas;

The negative pressure of the mixing chamber is taken in by mixing the return hot air and the natural cold air in the mixing chamber;

The dust in the returning hot air and the natural cold air collides with a plurality of oblique dust-collecting plates 6 in the downward process, and the dust slides down with the inclined surface under the scouring of the airflow, and the captured dust is discharged from the row by the downward airflow. The dust hole 7 is discharged, which acts as a dust removing device to reduce the pollution degree of the cooling air, thereby reducing the chance of contamination of the circuit board; after the dust-removed dry air enters the negative pressure chamber, the fan 3 extracts the dry clean air into the equipment compartment A cooling circuit board. ;

The heat generated by the mixed cooling gas flowing through the circuit board becomes hot air, and the hot air is divided into two parts: a part of the hot air is sucked into the mixing chamber from the return air hole 4 by the negative pressure of the mixing chamber, and the reflux regulating valve 5 is adjusted. The opening degree, adjusting the amount of recirculating gas, can pre-adjust the opening according to the meteorological conditions in the installation area of the equipment to form a cabinet that can adapt to the global environment. The return regulating valve 5 can be a butterfly valve; another part of the hot air is exhausted from the exhaust port 12 exclude.

The invention has the advantages of simple structure, low consumables and light weight, is favorable for reducing manufacturing cost, and is also beneficial for reducing equipment investment of operators. Moreover, the energy consumption is low, the heat dissipation effect is good, and the dust content and the relative humidity of the air in the operating chamber of the device can be effectively reduced, which is beneficial to improving the reliability of operation and reducing the chance of equipment failure.

Can be used in outdoor cabinets or in indoor cabinets. Especially suitable for electrical communication equipment cabinets, but also for other equipment cabinets. Research experiments have shown that in high-salt pollution and high relative humidity environments, the circuit boards of electronic equipment (including communication equipment) will corrode rapidly, causing the board to lose communication functions. In order to improve the operational reliability of communication equipment, strict control is required. The board is contaminated with dust and at the same time try to reduce the relative humidity and protect the board from condensation. Condensation is a necessary condition for the corrosion of the board. Condensation is related to the contamination of the board. Trying to block the conditions that cause condensation can prevent the electronic equipment from failing due to environmental corrosion.

Take the contamination of NaCl (sodium chloride, the most common pollutant) as an example:

In environments with high relative humidity (greater than 85% RH), even the surface of the board that meets all electronic assembly standards will condense.

On highly contaminated boards (long-term operation is carried by a cooling fan with a large amount of contaminants deposited on the board), even if the relative humidity of the environment is less than 65% RH, visual condensation can occur.

When the relative humidity is greater than 75% RH, visually visible condensation will be produced on all contaminated boards. Studies have shown that condensation can be controlled by strictly controlling the degree of contamination and relative humidity on the surface of the board. The invention is to reduce the environmental pollution and relative humidity of the circuit board while cooling the circuit board through the structural design.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. .

Claims

Rights request

A cabinet, comprising a cabinet, wherein a heat generating component is disposed in the cabinet body, wherein the cabinet body is provided with a equipment compartment and a mixing chamber, and the heating component can be disposed in the equipment compartment.

The cabinet according to claim 1, wherein a lower portion of the equipment compartment is provided with a negative pressure chamber, and the equipment compartment is connected to the negative pressure chamber and is provided with a plurality of fans;

The mixing chamber is disposed on one side of the cabinet body, and a through hole is disposed between the lower portion and the negative pressure chamber;

The return air holes are provided in an upper portion of the equipment compartment and the mixing chamber.

The cabinet according to claim 1 or 2, wherein the return air hole is provided with a return gas regulating valve.

The cabinet according to claim 1 or 2, wherein the cabinet corresponding to the mixing chamber is provided with at least one dust removing device.

The cabinet according to claim 4, wherein the dust removing device comprises an upwardly inclined dust trapping plate provided on the inner side of the cabinet body, and the dust collecting hole is formed on the bottom of the cabinet formed by the dust trapping plate. Dust can slide down the slope and drain from the dust drain.

The cabinet according to claim 1 or 2, wherein the through hole of the lower part of the equipment compartment and the mixing chamber is higher than the bottom of the mixing chamber; the bottom of the mixing chamber is provided with a dust removing port, and the dust removing port There is a dust pumping plate at the place.

The cabinet according to claim 1 or 2, wherein an upper portion of the mixing chamber is provided with a draft.

The cabinet according to claim 1 or 2, wherein an upper portion of the equipment compartment is provided with an exhaust port.

9. The cabinet according to claim 8, wherein the exhaust port is provided with an exhaust gas regulating valve.

The cabinet according to claim 7, wherein the air outlet is provided with a protective net.