CN107734931A - Electrical equipment component cabinet with accurate temperature control and independent humidity control function - Google Patents

Abstract

An electrical equipment component cabinet with precise temperature control and independent dehumidification functions, including a cabinet body, electrical equipment components installed in the cabinet, and an air conditioner. An upper fan and a lower fan that can adjust the blowing direction are respectively provided. The upper fan and the lower fan are used to send the cold air to the main heating components of the cabinet, and the circulation of the airflow in the cabinet without dead ends is completed by the rotation of the fan. A semiconductor dehumidifier is installed at the bottom of the cabinet, and the semiconductor dehumidifier is used to locally cool down the gas in the cabinet to ensure that the gas in the cabinet is kept at a low relative humidity, so as to avoid fluctuations in relative humidity when the air conditioner is started. Local condensation phenomenon. The present invention installs a semiconductor dehumidifier with independent dehumidification capability at the bottom of the cabinet, intelligently detects the relative humidity in the cabinet, controls the relative humidity in the cabinet within 70%, and keeps the relative humidity in the cabinet at a low value all the time , to avoid the problem of rapid rise in relative humidity due to the low temperature when the air conditioner starts cooling, which brings the risk of condensation.

Description

Electrical equipment component cabinet with precise temperature control and independent dehumidification function

technical field

The invention relates to the technical field of temperature and humidity control in intelligent substations, in particular to a precise temperature control and independent dehumidification device for electrical equipment component cabinets.

Background technique

With the rapid development of smart substations, electrical equipment such as protection, control, and monitoring, which were originally placed in the main control room, need to be placed on the spot. In order to reduce costs and meet the requirements of rapid station construction, the power supply company no longer uses the previous station construction mode. Instead, the station building mode of the electrical equipment component cabinet is adopted.

Outdoor electrical equipment component cabinets can be directly operated outdoors, and the outdoor environment is much harsher than indoors. The normal operating conditions of electrical equipment component cabinets in the power industry are: ambient temperature: -40 ° C ~ 45 ° C, Environmental relative humidity: 5% to 95% (no condensation and icing in the cabinet), sunshine intensity: 1120W/m ² , outdoor cabinets also need to adapt to various harsh conditions such as rain, snow, sand and dust.

With the rapid development of technology in the electric power industry, the corresponding electrical equipment placement cabinets need to have good heat dissipation and protection capabilities in addition to meeting the original use requirements. With the continuous promotion of unattended stations in power systems, electrical equipment The demand for a long maintenance cycle of component cabinets is becoming more and more urgent. The maintenance cycle is long, and the stable performance of equipment is closely related to the temperature and humidity of the component cabinets. At this stage, the main heat dissipation methods of electrical equipment component cabinets in the power industry are: (1) fan heat dissipation (2) heat exchanger heat dissipation (3) air conditioning heat dissipation.

Fan heat dissipation, the electrical equipment component cabinet of this cooling method, through the fan installed inside the electrical equipment component cabinet, forces the internal air duct of the cabinet to realize the circulation of internal and external air, and then realizes the continuous dissipation of heat in the cabinet to the outside. This method utilizes the outdoor air, has high heat dissipation efficiency, light weight, low operating cost, and is used in areas where the ambient temperature is not higher than 40°C, the environment is relatively clean, and there is less salt spray. Fan-type heat dissipation electrical component cabinet, the temperature of the heating component area is relatively high, and the temperature inside the cabinet is 5°C-10°C higher than the temperature outside the cabinet. The humidity inside the cabinet is affected by the ambient humidity and fluctuates greatly.

The heat exchanger dissipates heat. This heat dissipation method is to realize the heat conduction inside and outside the cabinet through the heat exchanger installed in the electrical equipment component cabinet, and then dissipate the heat of the equipment inside the electrical equipment component cabinet. The advantage of this heat dissipation solution is that the inside of the electrical equipment component cabinet is completely isolated from the external environment, thereby forming a good protection for the equipment inside the electrical equipment component cabinet, and at the same time the heat exchanger consumes less power; the disadvantage is that the inside of the electrical equipment component cabinet The temperature will be about 10°C higher than outdoors, and the heat exchanger does not have the ability to dehumidify.

Air-conditioning heat dissipation, this heat dissipation method is to realize the heat dissipation of the internal equipment of the electrical equipment assembly cabinet through the air conditioner installed on the electrical equipment assembly cabinet. The advantage of this heat dissipation method is that the internal and external environments are completely isolated, thereby forming a good protection for the equipment in the electrical equipment component cabinet; secondly, because the air conditioner has a cooling effect, no matter how high the temperature outside the electrical equipment component cabinet is, it can The temperature in the cabinet is controlled at the best working temperature of electrical components - 35°C. At present, the number of cabinets using air conditioners to dissipate heat in the actual operation process is increasing. Since the air conditioners are installed on the cabinet doors, the internal air path is short, the position of the light port of the protection device generates heat, the temperature is obviously high, and the temperature difference between different positions in the cabinet And when the air conditioner starts cooling, because the temperature in the cabinet will drop rapidly, the relative humidity in the cabinet will rise rapidly, the relative humidity in the cabinet will fluctuate greatly, and the relative humidity will rise in a short time, which will affect the installation Unfavorable, high humidity alarm will appear in severe cases; in addition, the air conditioner is generally installed on the cabinet door. The height of the air conditioner is generally 1000mm, and the height of the cabinet is 2000mm.

Contents of the invention

The purpose of the present invention is to provide an electrical equipment component cabinet with strong temperature control ability in the cabinet, uniform temperature in the cabinet, no local high temperature, and local independent dehumidification ability of the air-conditioning type cabinet, which can better meet the needs of the smart substation market. need.

An electrical equipment component cabinet with precise temperature control and independent dehumidification functions, including a cabinet body, electrical equipment components installed in the cabinet, and an air conditioner. An upper fan and a lower fan that can adjust the blowing direction are respectively provided. The upper fan and the lower fan are used to send the cold air to the main heating components of the cabinet, and the circulation of the airflow in the cabinet without dead ends is completed by the rotation of the fan. A semiconductor dehumidifier is installed at the bottom of the cabinet, and the semiconductor dehumidifier is used to partially cool the gas in the cabinet to ensure that the gas in the cabinet is kept at a low relative humidity, so as to avoid fluctuations in relative humidity when the air conditioner starts cooling. Local condensation phenomenon.

Further, the inner surface of the cabinet is coated with a phase-change microcapsule coating with intelligent temperature regulation. The phase-change microcapsule coating will absorb and store heat. When the temperature in the cabinet drops to the phase-change temperature, the phase-change microcapsules will The coating will release the heat absorbed before, through the above non-stop storage and release of heat, complete the temperature adjustment of the micro-environment on the inner surface of the cabinet, ensure that the temperature of the inner surface of the cabinet is maintained at around the phase transition temperature point, and avoid the internal surface of the cabinet Condensation occurs.

Further, the phase change temperature of the phase change microcapsule coating is 35°C.

In the present invention, a semiconductor dehumidifier with independent dehumidification capability is installed at the bottom of the cabinet to intelligently detect the relative humidity in the cabinet. Once the relative humidity in the cabinet exceeds 70%, the independent semiconductor dehumidifier will separate out the moisture in the cabinet. Drain to the outside of the cabinet to control the relative humidity in the cabinet within 70%, and always keep the relative humidity in the cabinet at a low value, so as to avoid the problem of rapid rise in relative humidity caused by the low temperature when the air conditioner starts to cool, which will cause condensation. risk.

Description of drawings

Fig. 1 is a schematic structural view of an electrical equipment component cabinet with precise temperature control and independent dehumidification functions according to the present invention.

Among the figure: 101—cabinet body, 102—electric equipment components, 103—upper fan, 104—air conditioner, 105—air return air outlet of air conditioner, 106—air conditioner air outlet, 107—lower fan, 108—semiconductor dehumidifier.

detailed description

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

Fig. 1 shows the structural representation of the electromagnetic protection interference instrument of the present invention, and the electromagnetic protection interference instrument comprises a cabinet body 101, an electrical equipment assembly 102 (such as a merging unit, an intelligent terminal, etc.) located in the cabinet body 101, an upper fan 103 , air conditioner 104, lower fan 107, semiconductor dehumidifier 108. The air conditioner 104 is installed on the back door of the cabinet body 101 , the upper part of the air conditioner 104 is provided with an air conditioner air return port 105 , and the lower part of the air conditioner 104 is provided with an air conditioner air outlet 106 . The air conditioner 104 is used for heat dissipation when the temperature in the cabinet body 101 is high, and is used for heating when the temperature in the cabinet body 101 is low in winter. Both cooling and heating of the air conditioner 104 are realized through automatic control.

The upper and lower positions of the cabinet door where the air conditioner 104 is installed are respectively provided with an upper fan 103 and a lower fan 107 that can adjust the blowing direction. The upper fan 103 and the lower fan 107 are used to send cold air to the position of the main heating components to avoid local high temperature problems of electrical components, and complete the circulation of the airflow in the cabinet without dead ends through the rotation of the fans, so as to elevate the cabinet Uniformity of door temperature. Specifically, the upper fan 103 can adjust the air outlet direction of the fan through the rotation of the movable structural part according to the position of the upper heat source, and send the cold air to the position of the concentrated heating components, and quickly take away the heat of the concentrated heating components to avoid Heat concentration causes local overheating; the lower fan 107 stirs the airflow at the bottom to ensure that the air temperature in different positions in the cabinet is relatively uniform.

As the temperature in the cabinet changes, the moment the air conditioner 104 starts the cooling mode, the temperature is low and the humidity in the cabinet 101 is high, it is easy to have local condensation or increase the relative humidity in the cabinet. To operate at lower relative humidity, the present invention provides a separate semiconductor dehumidifier 108 . The semiconductor dehumidifier 108 is installed at the bottom of the cabinet 101 and has an independent dehumidification capability, which can ensure that the gas in the cabinet 101 is always kept at a low relative humidity, so as to avoid fluctuations in relative humidity when the air conditioner 104 starts to cool, causing the cabinet to dehumidify. In the body 101, due to the decrease of the temperature, the relative humidity increases and the local condensation phenomenon occurs.

The semiconductor dehumidifier 108 is a device for dehumidification through semiconductor refrigeration, also called thermoelectric cooling and dehumidification. It works with direct current, which can both cool and heat. Cooling or heating is realized on the same refrigerator, and this effect is produced through the principle of thermoelectricity. A monolithic refrigerator consists of two ceramic sheets, with N-type and P-type semiconductor materials (bismuth telluride) in the middle, and the semiconductor elements are connected in series on the circuit. The working principle of the semiconductor refrigerator is: when a piece of N-type semiconductor material and a piece of P-type semiconductor material are connected into a galvanic pair, after a DC current is connected in this circuit, energy transfer can be generated, and the current is generated by the N-type element. The joint flowing to the P-type element absorbs heat and becomes a cold end; the current flows from the P-type element to the N-type element joint to release heat and becomes a hot end. The size of heat absorption and heat release is determined by the size of the current and the number of pairs of semiconductor materials N and P. Partial condensation of water molecules can be completed by partially cooling the gas in the cabinet 101 , and then discharged out of the cabinet 101 to complete the humidity control of the cabinet 101 .

In order to prevent condensation on the inner surface of the cabinet 101, the inner surface of the cabinet 101 is coated with a phase-change microcapsule coating with intelligent temperature regulation, and the phase-change temperature of the phase-change microcapsules can be 35°C. When the temperature inside the cabinet 101 exceeds 35°C, the phase-change microcapsule coating will absorb and store the heat, and when the temperature in the cabinet drops to 35°C, the phase-change microcapsule coating will release the previously absorbed heat through the above Continuously store and release heat, complete the temperature regulation of the micro-environment of the inner surface of the cabinet, ensure that the temperature of the inner surface of the cabinet is maintained at about 35°C, and completely avoid the occurrence of condensation on the inner surface of the cabinet.

Since the height of the cabinet body 101 is generally 2000mm, the cabinet is equipped with a combination unit, protection device and wires, and the heating parts are relatively concentrated, and there is a risk of a large temperature difference between different positions in the cabinet. Send it to a place where the heat is concentrated, and circulate the air flow to ensure that the temperature difference between the cabinet door does not exceed 10°C. Specifically, the present invention adjusts the air outlet direction through the upper fan 103 and the lower fan 107, which can flexibly adjust the blowing direction according to the different heating distribution of the components in the cabinet, so as to avoid the problem of excessive local temperature in the cabinet; Carry out humidity control in the cabinet to ensure that the relative humidity inside the cabinet is kept below 65% RH, so as to avoid the problem of rapid rise in relative humidity when the air conditioner starts to cool, and then local condensation; the inner surface of the cabinet 101 The 35°C phase-change microcapsule coating has the ability to intelligently store heat and cold, and solves the problem of metal materials, high thermal conductivity, and being greatly affected by temperature. During the process of temperature changes in the cabinet, condensation is prone to occur. question.

To sum up, the present invention can perfectly control the temperature and humidity in the cabinet through the precise temperature control of the electrical equipment component cabinet, the intelligent temperature regulation design and the independent dehumidification design in the micro-environment.

Claims (3)

1. a kind of electrical equipment component cabinet with accurate temperature control and independent humidity control function, including cabinet (101), located at cabinet (101) electrical equipment component (102), air-conditioning (104) in, the air-conditioning (104) are installed on the back door of cabinet (101), and it is special Sign is：The cabinet door top of installation air-conditioning (104) and lower position set the upper fan (103) that can adjust blowing direction respectively With bottom fan (107), the upper fan (103) and the bottom fan (107) are used to cold wind delivering to cabinet (101) master The heating element position wanted, circulation of the cabinet interior air-flow without dead angle is completed by the moving of fan；The bottom position of cabinet (101) Semiconductor dehumidifier (108) is installed, the semiconductor dehumidifier (108) is used to locally drop cabinet (101) interior gas Temperature, to ensure that the gas in cabinet (101) is maintained at low relative humidity, avoid occurring relatively during air-conditioning (104) cooling activation Moisture fluctuation and there is local condensate phenomenon.

2. there is accurate temperature control and the electrical equipment component cabinet of independent humidity control function as claimed in claim 1, it is characterised in that： Cabinet (101) inner surface scribbles the phase-change microcapsule coating for possessing intelligent thermoregulating, and the phase-change microcapsule coating can inhale heat Harvesting storage, until the temperature in cabinet (101) is reduced to phase transition temperature, heat that phase-change microcapsule coating will can absorb before Release, ceaselessly storage with discharging heat, completes the temperature adjustment under cabinet inner surface microenvironment, it is ensured that cabinet more than Internal surface temperature maintains phase transformation temperature pointses or so, the generation for avoiding cabinet inner surface from condensing.

3. there is accurate temperature control and the electrical equipment component cabinet of independent humidity control function as claimed in claim 2, it is characterised in that： The phase transformation temperature pointses of the phase-change microcapsule coating are 35 DEG C.