Ventilation system of high-voltage frequency converter room in severe cold and cold areas and working method

Abstract

The invention relates to a ventilation system for a high-voltage frequency converter room in severe cold areas and a working method of the ventilation system. The ventilation system comprises a fresh air handling unit, a fresh air pipeline, an air supply pipeline, an air inlet pipeline, an air return pipeline, an inner exhaust pipeline and an outer exhaust pipeline. The fresh air handling unit is composed of a fresh air section, a first heating section, an air return section, a second heating section, a fan section and an air supply section. A fresh air electric regulating valve is arranged on the fresh air pipeline; the first heating section and the second heating section are provided with heaters, and the fan section is provided with a fan; an air return electric regulating valve is arranged on the air return pipeline; a natural air inlet electric valve is arranged on the air inlet pipeline; an inner exhaust electric control valve is arranged on the inner exhaust pipeline; an external exhaust air electric regulating valve is arranged on the external exhaust pipeline; the ventilation system can effectively solve the problems existing in temperature control of the high-voltage frequency converter chamber in severe cold and cold areas, and is simple and compact in structure, convenient to construct and use, suitable for various working conditions and climate conditions and remarkable in energy conservation and emission reduction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation and cooling, and in particular to a ventilation system for a high-voltage frequency converter room in severe cold or cold regions and a working method thereof. Background Art

[0002] As a high-power frequency conversion speed regulating device, high-voltage inverter is widely used in the industrial field. The use of high-voltage inverter can achieve energy saving, emission reduction, pollution reduction and other goals in industrial production. When the high-voltage inverter is running, its own heat is quite large, and its failure rate will also increase with the increase of temperature, and its service life will decrease with the increase of temperature. In extremely cold and cold areas, too low ambient temperature will also affect the start-up and operation of the high-voltage inverter. Therefore, it is very important to control the temperature of the place where the high-voltage inverter is located, that is, the ambient temperature in the high-voltage inverter room.

[0003] The current mainstream method of controlling the indoor ambient temperature of high-voltage frequency converters is to install air conditioners in the high-voltage frequency converter room for closed cooling, or to set up fans for forced ventilation and cooling. In order to cope with the extremely low ambient temperature in winter in cold and cold areas, air conditioners generally use heating and cooling type air conditioners, while high-voltage frequency converter rooms that simply use fans for forced ventilation and cooling also need to be equipped with heating facilities.

[0004] When using air conditioning for cooling, it is necessary to calculate the cooling capacity of the air conditioner based on the heat generated by the high-voltage inverter and the indoor area of ​​the high-voltage inverter, and then equip a sufficient number of air conditioners for closed circulation. In actual operation, the upper area of ​​the front of the high-voltage inverter cabinet actually inhales the hot air that has just been discharged, that is, the air flow forms a short circuit, so it cannot achieve an effective cooling effect. The air conditioner usually adopts the form of lower air intake and upper air outlet, which to a certain extent forms a "wind grabbing" phenomenon with the high-voltage inverter, that is, the air inhaled by the lower part of the high-voltage inverter is not completely the cold air after the air conditioner cools down, which ultimately leads to low operating efficiency of the entire cooling system. In addition, the energy consumption of the heating and cooling air conditioning unit itself is relatively large, resulting in secondary waste of energy.

[0005] When fans are used for forced ventilation and cooling, they can still achieve good cooling effects and obvious energy-saving effects in the summer or transition seasons in extremely cold and cold areas. However, in winter and some spring and autumn seasons, whether it is direct duct discharge or indirect ventilation, due to the low outdoor air temperature and the high exhaust temperature of the high-voltage inverter, the ventilation temperature difference at this time far exceeds the difference between the inlet temperature and the exhaust temperature required by the high-voltage inverter (usually not exceeding 15°C), and during this period, condensation or even ice formation at the air inlet is more serious, which often causes the ventilation system to be unable to use normally.

[0006] In summary, the defects and deficiencies of the existing ventilation system for high-voltage inverter rooms in severe cold and cold regions are summarized as follows:

[0007] (1) The air conditioning cooling method consumes a lot of energy and has low operating efficiency, resulting in secondary energy waste. The air conditioners are generally larger in size and the indoor units take up a lot of space, which affects access and maintenance. The cooling air flow is not organized properly and even short circuits occur, resulting in low cooling efficiency. The initial investment and operating costs are high.

[0008] (2) The method of using fans for forced ventilation and cooling cannot solve the condensation problem of fresh air outlets in severe cold and cold areas; in winter, the fresh air directly entering the room cannot meet the inlet and exhaust temperature difference required by the frequency conversion equipment, which affects the service life of the equipment; the applicable working conditions are relatively single and cannot take into account various climatic conditions;

[0009] (3) For extremely cold and cold regions, separate indoor heating facilities need to be installed, and the heat generated by the high-voltage inverter itself is not effectively utilized.

[0010] (4) The operation mode is single and the overall automation level is not high. Summary of the invention

[0011] The present invention provides a ventilation system for a high-voltage inverter room in extremely cold and cold areas and a working method thereof, which can effectively solve the problems existing in temperature control of a high-voltage inverter room in extremely cold and cold areas. The ventilation system has a simple and compact structure, is easy to construct and use, is applicable to a variety of working conditions and climatic conditions, and has significant energy-saving and emission-reduction effects.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A ventilation system for a high-voltage frequency converter room in extremely cold and cold areas comprises a fresh air unit, a fresh air duct, an air supply duct, an air inlet duct, a return air duct, an inner exhaust duct and an outer exhaust duct; the fresh air unit is arranged outside the high-voltage frequency converter room, and is composed of a fresh air section, a heating section, a return air section, a second heating section, a fan section and an air supply section connected in sequence; the fresh air section is connected to one end of the fresh air duct, and a fresh air outlet is arranged at the other end of the fresh air duct to communicate with the external atmosphere, and a fresh air electric regulating valve is arranged on the fresh air duct; a heater is arranged at the heating section and the second heating section, and a fan is arranged at the fan section; the return air section is connected to the return air outlet arranged on the end wall of the high-voltage frequency converter room through the return air duct, and a return air electric regulating valve is arranged on the return air duct; the air supply section is connected to the air supply duct, and the air supply duct extends to the high-voltage frequency converter room, and multiple An air supply outlet is connected with the high-voltage inverter room, and the air supply duct is also connected to the natural air inlet arranged on the side wall of the high-voltage inverter room through an air inlet duct, and a natural air inlet electric valve is arranged on the air inlet duct; multiple high-voltage inverters in the high-voltage inverter room are grouped in corresponding high-voltage inverter cabinets; an exhaust outlet is arranged on the top of the high-voltage inverter cabinet, and the exhaust outlet is connected to the inner exhaust duct and the outer exhaust duct at the same time, the inner exhaust outlet of the inner exhaust duct is arranged in the high-voltage inverter room, and an inner exhaust electric regulating valve is arranged on the inner exhaust duct; the outer exhaust outlet of the outer exhaust duct is arranged on the side wall of the high-voltage inverter room and is connected to the external atmosphere, and an outer exhaust electric regulating valve is arranged on the outer exhaust duct; the fresh air electric regulating valve, the return air electric regulating valve, the natural air inlet electric valve, the inner exhaust air electric regulating valve and the outer exhaust air electric regulating valve are respectively connected to the control system.

[0014] A fan room is arranged outside the high-voltage frequency converter room, and a fresh air unit is arranged in the fan room; a fresh air inlet of the fresh air unit is arranged on a side wall of the fan room.

[0015] The heater is an electric heater with multiple adjustment levels.

[0016] The natural air intake electric valve is a heat-insulating electric closed regulating valve.

[0017] The fresh air inlet is a single-layer rainproof louver inlet; the return air inlet and the inner exhaust air outlet are single-layer louver inlets; the outer exhaust air outlet is a single-layer rainproof louver inlet; the natural air inlet is a single-layer rainproof louver inlet and is equipped with a primary filter; the air supply outlet is a double-layer louver inlet with an adjustable air supply angle.

[0018] A primary filter and a medium filter are provided at the fresh air inlet; a primary filter is provided at the natural air inlet.

[0019] A working method of a ventilation system for a high-voltage inverter room in severe cold and cold regions, specifically comprising the following processes:

[0020] 1) During winter operation, the fresh air unit is started, and the fresh air introduced from the outside is preheated in the first stage of heating and mixed with the return air in the high-voltage inverter room, and then sent into the high-voltage inverter room through the air supply duct and multiple air supply ports; according to the indoor temperature of the high-voltage inverter, the mixing ratio of fresh air and return air is controlled. When the indoor temperature is higher than the set value, the fresh air volume is increased and the return air volume is reduced; conversely, when the indoor temperature is lower than the set value, the fresh air volume is reduced and the return air volume is increased. If the set temperature is still not reached, the second stage of heating is turned on for additional heating;

[0021] The cooling air inlet on the front of the high-voltage frequency converter cabinet draws in relatively cold air from the air supply port into the high-voltage frequency converter room, and dissipates heat and cools the high-voltage frequency converter in the high-voltage frequency converter cabinet. The hot air after heat exchange is discharged to the outside through the external exhaust port and / or to the room through the internal exhaust port. When the indoor temperature is higher than the set value, the exhaust volume of the external exhaust port is increased and the exhaust volume of the internal exhaust port is reduced; conversely, when the indoor temperature is lower than the set value, the exhaust volume of the external exhaust port is reduced and the exhaust volume of the internal exhaust port is increased, so as to meet the heat dissipation requirements of the high-voltage frequency converter cabinet and the indoor heating requirements at the same time;

[0022] In extremely cold weather, if the heat transferred outward from the high-voltage inverter room is greater than the heat dissipation of the high-voltage inverter cabinet, close the fresh air electric regulating valve and fully open the return air electric regulating valve to achieve internal air circulation; if the temperature is still lower than the set value, open the second stage of heating for additional heating;

[0023] 2) When operating in summer and transition seasons, the fresh air unit is stopped, the fresh air electric regulating valve, return air electric regulating valve, internal exhaust air electric regulating valve are closed, the external exhaust air electric regulating valve and natural air intake electric valve are opened, and the high-voltage inverter room is supplied with air through the natural air inlet; the replenished natural air enters the high-voltage inverter room through the air supply duct and air supply port, and the replenished fresh air is sucked in by the air inlet on the front of the high-voltage inverter cabinet. The replenished fresh air is completely discharged after cooling the high-voltage inverter, and the power of the high-voltage inverter cabinet's own exhaust fan is used to achieve fresh air DC operation.

[0024] The external exhaust electric regulating valve and the internal exhaust electric regulating valve adjust the valve opening according to the temperature and pressure signals to control the ratio of the external exhaust air volume to the internal exhaust air volume; when the indoor temperature or pressure of the high-voltage inverter is higher than the set value, the opening of the external exhaust electric regulating valve is increased and the opening of the internal exhaust electric regulating valve is reduced; when the indoor temperature or pressure of the high-voltage inverter is lower than the set value, the opening of the external exhaust electric regulating valve is reduced and the opening of the internal exhaust electric regulating valve is increased; the heat dissipation of the high-voltage inverter cabinet is used to maintain the indoor temperature of the high-voltage inverter to achieve the overall thermal balance of the room, and at the same time, the exhaust volume is used to adjust the indoor pressure of the high-voltage inverter to maintain the indoor pressure balance.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The ventilation system can operate stably all year round and is suitable for a variety of working conditions and climatic conditions, which effectively ensures the safe and stable operation of electrical equipment and production equipment and improves equipment operation rate and production efficiency;

[0027] (2) Through the reasonable setting of each functional section of the fresh air unit, the use requirements of different working conditions can be met, the equipment is simple, the investment cost is low, and the floor space is reduced.

[0028] (3) In summer and transition seasons, the ventilation system can achieve fresh air operation by relying only on the exhaust fan of the high-voltage frequency conversion cabinet, with low energy consumption, low operating cost, and significant energy-saving and emission reduction effects;

[0029] (4) When the ventilation system is running in winter, it can effectively utilize the heat generated by the high-voltage frequency conversion cabinet for heating, which not only saves heating facilities, but also saves heating energy consumption, and has high economic benefits;

[0030] (5) The ventilation system is simple to operate and easy to use. It can realize different working conditions by switching the electric regulating valve and the electric valve, and has a high level of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a plan layout diagram of a ventilation system for a high-voltage frequency converter room in severe cold and cold regions.

[0032] Figure 2 It is a vertical view of the high-voltage frequency converter room of the present invention.

[0033] In the figure: 1. Fresh air unit 1-1. Fresh air section 1-2. Heating section 1-3. Return air section 1-4. Heating section 2 1-5. Fan section 1-6. Supply air section 2. Fresh air electric regulating valve 3. Return air electric regulating valve 4. External exhaust air electric regulating valve 5. Internal exhaust air electric regulating valve 6. Natural air inlet electric valve 7. Fresh air outlet 8. Return air outlet 9. External exhaust air outlet 10. Natural air inlet 11. Supply air outlet 12. Internal exhaust air outlet 13. High-voltage inverter room 14. High-voltage inverter cabinet 15. Fan room DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0035] like Figure 1 , Figure 2As shown, the ventilation system of a high-voltage inverter room in extremely cold and cold areas described in the present invention comprises a fresh air unit 1, a fresh air duct, an air supply duct, an air inlet duct, a return air duct, an inner exhaust duct and an outer exhaust duct; the fresh air unit 1 is arranged outside the high-voltage inverter room 13, and is composed of a fresh air section 1-1, a heating section 1-2, a return air section 1-3, a heating section 2 1-4, a fan section 1-5 and an air supply section 1-6 connected in sequence; the fresh air section 1-1 is connected to one end of the fresh air duct, and a fresh air outlet 7 is arranged at the other end of the fresh air duct to communicate with the external atmosphere, and a fresh air electric regulating valve 2 is arranged on the fresh air duct; the heating section 1-2 and the heating section 2 1-4 are provided with a heater, and the fan section 1-5 is provided with a fan; the return air section 1-3 is connected to the return air outlet 8 arranged on the end wall of the high-voltage inverter room 13 through the return air duct, and a return air electric regulating valve 3 is arranged on the return air duct; the air supply section 1-6 is connected to the air supply duct, and the air supply duct extends to the high-voltage inverter room In the frequency converter room 13, a plurality of air supply ports 11 are arranged on the air supply duct and are connected with the high-voltage frequency converter room 13. The air supply duct is also connected to the natural air inlet 10 arranged on the side wall of the high-voltage frequency converter room 13 through the air inlet duct, and a natural air inlet electric valve 6 is arranged on the air inlet duct; a plurality of high-voltage frequency converters in the high-voltage frequency converter room 13 are grouped and arranged in the corresponding high-voltage frequency converter cabinet 14; an exhaust port is arranged on the top of the high-voltage frequency converter cabinet 14, and the exhaust port is connected to the inner exhaust port and the outer exhaust port at the same time, the inner exhaust port 12 of the inner exhaust port is arranged in the high-voltage frequency converter room 13, and an inner exhaust electric regulating valve 5 is arranged on the inner exhaust port; the outer exhaust port 9 of the outer exhaust port is arranged on the side wall of the high-voltage frequency converter room 13 and is connected with the external atmosphere, and an outer exhaust electric regulating valve 4 is arranged on the outer exhaust port; the fresh air electric regulating valve 2, the return air electric regulating valve 3, the natural air inlet electric valve 6, the inner exhaust air electric regulating valve 5, and the outer exhaust air electric regulating valve 4 are respectively connected to the control system.

[0036] A fan room 15 is arranged outside the high-voltage frequency converter room 13 , and the fresh air unit 1 is arranged in the fan room 15 ; the fresh air inlet 7 of the fresh air unit 1 is arranged on the side wall of the fan room 15 .

[0037] The heater is an electric heater with multiple adjustment levels.

[0038] The natural air intake electric valve 6 is a heat preservation type electric closed regulating valve.

[0039] The fresh air vent 7 is a single-layer rainproof louver vent; the return air vent 8 and the inner air exhaust vent 12 are single-layer louver vents; the outer air exhaust vent 9 is a single-layer rainproof louver vent; the natural air inlet 6 is a single-layer rainproof louver vent and is equipped with a primary filter; the air supply vent 11 is a double-layer louver vent with an adjustable air supply angle.

[0040] A primary filter and a medium filter are provided at the fresh air inlet 7; a primary filter is provided at the natural air inlet 6.

[0041] The working method of the ventilation system of the high-voltage inverter room in severe cold and cold areas described in the present invention specifically includes the following process:

[0042] 1) During winter operation, the fresh air unit 1 is started, and the fresh air introduced from the outside is preheated by the first heating stage 1-2 and mixed with the return air in the high-voltage inverter room 13, and then sent into the high-voltage inverter room 13 through the air supply duct and multiple air supply ports 11; the mixing ratio of fresh air and return air is controlled according to the temperature in the high-voltage inverter room 13. When the indoor temperature is higher than the set value, the fresh air volume is increased and the return air volume is reduced; on the contrary, when the indoor temperature is lower than the set value, the fresh air volume is reduced and the return air volume is increased. If the set temperature is still not reached, the second heating stage 1-4 is turned on for additional heating;

[0043] The cooling air inlet on the front side of the high-voltage frequency conversion cabinet 14 draws in relatively cold air from the air supply port 11 into the high-voltage frequency conversion chamber 13, and performs heat dissipation and cooling on the high-voltage frequency conversion cabinet 14. The hot air after heat exchange is discharged to the outside through the external exhaust port 9 and / or discharged to the room through the internal exhaust port 12. When the indoor temperature is higher than the set value, the exhaust volume of the external exhaust port 9 is increased, and the exhaust volume of the internal exhaust port 12 is reduced; conversely, when the indoor temperature is lower than the set value, the exhaust volume of the external exhaust port 9 is reduced, and the exhaust volume of the internal exhaust port 12 is increased, so as to meet the heat dissipation demand of the high-voltage frequency conversion cabinet 14 and the indoor heating demand at the same time;

[0044] In extremely cold weather, if the heat transferred outward from the high-voltage inverter room 13 is greater than the heat dissipation of the high-voltage inverter cabinet 14, the fresh air electric regulating valve 2 is closed and the return air electric regulating valve 3 is fully opened to realize the internal circulation of air; if the temperature is still lower than the set value, the second heating stage 1-4 is opened for supplementary heating;

[0045] 2) When operating in summer and transition seasons, the fresh air unit 1 is stopped, the fresh air electric regulating valve 2, the return air electric regulating valve 3, and the internal exhaust air electric regulating valve 5 are closed, and the external exhaust air electric regulating valve and the natural air intake electric valve 6 are opened, and the high-voltage inverter room 13 is replenished with air through the air intake of the natural air inlet 10; the replenished natural air enters the high-voltage inverter room 13 through the air supply duct and the air supply port 11, and the replenished fresh air is sucked in by the front air inlet of the high-voltage inverter cabinet 14. The replenished fresh air is completely discharged after cooling the high-voltage inverter, and the power of the exhaust fan of the high-voltage inverter cabinet 14 is used to realize fresh air DC operation.

[0046] The external exhaust air electric regulating valve 4 and the internal exhaust air electric regulating valve 5 adjust the valve opening according to the temperature and pressure signals to control the ratio of the external exhaust air volume to the internal exhaust air volume; when the temperature or pressure in the high-voltage inverter room 13 is higher than the set value, the opening of the external exhaust air electric regulating valve 4 is increased, and the opening of the internal exhaust air electric regulating valve 5 is reduced; when the temperature or pressure in the high-voltage inverter room 13 is lower than the set value, the opening of the external exhaust air electric regulating valve 4 is reduced, and the opening of the internal exhaust air electric regulating valve 5 is increased; the heat dissipation of the high-voltage inverter cabinet 14 is used to maintain the temperature in the high-voltage inverter room 13 to achieve the overall thermal balance in the room, and at the same time, the exhaust air volume is used to adjust the pressure in the high-voltage inverter room 13 to maintain the indoor pressure balance.

[0047] In order to solve the defects and shortcomings of the existing ventilation system for high-voltage inverter rooms in severe cold and cold areas, the present invention provides a ventilation system for high-voltage inverter rooms in severe cold and cold areas (hereinafter referred to as ventilation system).

[0048] The ventilation system of the present invention is provided with a fresh air unit 1, which can heat the fresh air introduced from the outside during winter operation, thereby effectively preventing condensation and dew formation after the fresh air and return air are directly mixed. The external exhaust air electric regulating valve 4 on the external exhaust pipe at the top of the high-voltage frequency conversion cabinet 14 and the internal exhaust air electric regulating valve 5 on the internal exhaust pipe can adjust the ratio of the external exhaust air volume and the internal exhaust air volume, which can not only ensure the pressure balance in the high-voltage frequency conversion room 13, but also ensure the indoor temperature in winter through the heat of the internal exhaust air. The return air of the fresh air unit 1 is drawn from the high-voltage frequency conversion room 13, thereby reducing the return air temperature, which is more conducive to preventing condensation and dew formation after the fresh air and return air are mixed.

[0049] In summer and transition season, the fresh air unit 1 can be stopped. At this time, the fresh air electric regulating valve 2, the return air electric regulating valve 3, and the internal exhaust air electric regulating valve 5 are closed, and the external exhaust air electric regulating valve 4 and the natural air intake electric valve 6 are opened. The fresh air operation is realized only by the exhaust fan of the high-voltage frequency conversion cabinet 14, and the energy saving effect is obvious. The natural air intake system and the mechanical air supply system share the air supply duct and air supply port 11, which not only ensures the uniformity of air supply, but also saves pipes and reduces space occupation.

[0050] In the ventilation system of the present invention, the fresh air inlet 7 of the fresh air unit 1 is arranged at the lower part of the side wall of the fan room 15, the exhaust port of the high-voltage frequency conversion cabinet 14 is arranged at the upper part of the side wall of the high-voltage frequency conversion room 13, and the natural air inlet 10 is arranged at the upper part of the side wall of the high-voltage frequency conversion room 13 opposite to the high-voltage frequency conversion cabinet 14, and the airflow of each air outlet has no short-circuit risk. In the high-voltage frequency conversion room 13, the natural air inlet 10 or the mechanical air supply port (i.e., the air supply port 11) is arranged at the upper part of the high-voltage frequency conversion room 13, and the air inhaled by the cooling air inlet of the high-voltage frequency conversion cabinet 14 is completely relatively cold air after mixed air cooling, thereby improving the operating efficiency of the entire ventilation system.

[0051] The structure of the ventilation system for high-voltage frequency converter room in severe cold and cold regions described in the present invention has the following characteristics:

[0052] (1) The fresh air unit 1 contains two heating sections and a return air section 1-3. During winter operation, the fresh air can be preheated by heating a section 1-2. The preheated fresh air is then mixed with the return air for delivery to ensure that the supply air temperature is above the dew point, thereby effectively preventing condensation from occurring in the fresh air outlet 7 and the fresh air unit 1. The return air of the fresh air unit 1 is taken from the high-voltage inverter room 13, rather than being directly drawn from the high-voltage inverter cabinet 14 through an air duct, thereby reducing the return air temperature and further preventing condensation from occurring after the fresh air and return air are mixed. The fresh air unit 1 is provided with two heating sections, which can effectively guarantee the inlet and exhaust air temperature difference required by the high-voltage inverter equipment in an extremely low temperature environment, and the full utilization of the return air heat effectively reduces the demand for heating in the heating section, thereby achieving an energy-saving effect.

[0053] (2) During normal operation in winter, part of the exhaust air of the high-voltage inverter cabinet 14 is directly discharged into the room, and the heated indoor air is introduced into the return air section 1-3 of the fresh air unit 1, so as to achieve the overall heat balance and pressure balance of the high-voltage inverter room 13, effectively utilize the heat generated by the high-voltage inverter cabinet 14 itself to achieve the heating effect, and at the same time prevent the invasion of cold air and dust caused by negative pressure in the high-voltage inverter room 13.

[0054] (3) When the high-voltage inverter cabinet 14 is operated for the first time or stops operating in winter, in order to ensure the minimum temperature in the high-voltage inverter room 13, the fresh air electric regulating valve 2 can be closed, and only the return air and supply air systems can be operated. The heating of the high-voltage inverter room 13 can be achieved by heating the second stage 1-4, without the need for additional heating facilities, thereby reducing equipment investment and saving space.

[0055] (4) In summer and transition seasons, the fresh air unit 1 can be stopped. At this time, the fresh air electric regulating valve 2, the return air electric regulating valve 3, and the internal exhaust air electric regulating valve 5 are closed, and the external exhaust air electric regulating valve 4 and the natural air intake electric valve 6 are opened. The exhaust fan power of the high-voltage frequency conversion cabinet 14 is used to realize fresh air operation, fully utilize the outdoor natural wind, and achieve obvious energy-saving effects.

[0056] (5) Through the reasonable arrangement of air outlets and air ducts, an effective airflow organization is formed, which not only eliminates the risk of short circuit but also does not occupy the operation and maintenance space.

[0057] The present invention discloses a ventilation system for a high-voltage inverter room in severe cold and cold regions, which adjusts the ambient temperature of a high-voltage inverter room 13 by setting a fresh air unit 1, processing fresh air and adjusting the ventilation volume. The fresh air unit 1 can be arranged in the fan room 15, and can also be directly placed in the high-voltage inverter room 13 if the internal space of the high-voltage inverter room 13 allows. The ventilation system has multiple functions of fresh air, return air, air supply, exhaust air, and air supply. During winter operation, the fresh air directly drawn from the outside is mixed with the indoor return air, and then sent into the high-voltage inverter room 13 through the air supply duct and the air supply port 11. According to the temperature in the high-voltage inverter room 13, the mixing ratio of the fresh air and the return air is controlled. The higher the indoor temperature, the greater the fresh air volume and the smaller the return air volume; the lower the indoor temperature, the smaller the fresh air volume and the larger the return air volume.

[0058] The cooling air inlet on the front side of the high-voltage frequency conversion cabinet 14 draws in the relatively cold air sent into the room by the fresh air unit 1, takes away the heat in the cabinet and then discharges part of it to the outside and part of it to the inside through the exhaust duct on the top of the cabinet. The higher the indoor temperature, the greater the exhaust volume directly discharged to the outside and the smaller the exhaust volume discharged to the room. Conversely, the lower the indoor temperature, the smaller the exhaust volume directly discharged to the outside and the greater the exhaust volume discharged to the room. This not only meets the heat dissipation needs of the high-voltage frequency conversion cabinet 14, but also meets the indoor heating needs, thereby achieving energy conservation and emission reduction.

[0059] When the ventilation system is running in summer and transition season, the fresh air unit 1 is stopped, the corresponding fresh air electric regulating valve 2, return air electric regulating valve 3, and internal exhaust air electric regulating valve 5 are closed, the external exhaust air electric regulating valve 4 is opened, and the natural air intake electric valve 6 is opened for air supply. The air supply system and the air supply system share the air supply duct and air supply port 11. At this time, only the exhaust fan power of the high-voltage frequency conversion cabinet 14 is used to realize the operation of fresh air, making full use of the outdoor natural wind, and the energy-saving effect is obvious.

[0060] The structures and precautions of the ventilation system for high-voltage inverter room in severe cold and cold areas described in the present invention are as follows:

[0061] The fresh air unit 1 includes a fresh air section 1-1, a heating section 1-2, a return air section 1-3, a heating section 2 1-4, a fan section 1-5 and an air supply section 1-6, and other functional sections may be added according to actual needs. The fresh air section 1-1 can buffer the fresh air entering the fresh air unit 1, reduce the heat convection at the fresh air outlet 7, achieve uniform air intake and prevent condensation at the fresh air outlet 7.

[0062] The heating section 1-2 and the heating section 2-4 are preferably electric heaters with multiple adjustable levels to improve the flexibility of the use of the fresh air unit 1. Steam or hot water can also be selected as the heating source depending on the supply conditions of the energy medium. The heating section 1-2 is arranged downstream of the fresh air section 1-1 to preheat the fresh air introduced from the outside to prevent condensation due to the low temperature of the fresh air after it is mixed with the return air and the supply air temperature is still below the dew point temperature. When the high-voltage frequency conversion cabinet 14 is first operated or stopped in winter, in order to ensure the minimum temperature in the high-voltage frequency converter room 13 and realize the internal circulation of air, it can be heated by the heating section 2-4. There is no need to set up heating facilities in the high-voltage frequency converter room 13, thereby reducing equipment investment and saving space.

[0063] By setting the return air section 1-3, the heat dissipation of the high-voltage frequency conversion cabinet 14 can be effectively utilized to achieve heat recovery, reduce the heating amount, and reduce the temperature difference between the cabinet inlet and exhaust air.

[0064] The air supply sections 1-5 can realize mixed air supply, have the function of reducing noise, and are convenient for connection with the air supply duct.

[0065] The fresh air electric regulating valve 2 and the return air electric regulating valve 3 are used to adjust the valve opening according to the temperature signal to control the mixing ratio of the fresh air and the return air. The higher the temperature in the high-voltage inverter room 13, the larger the opening of the fresh air electric regulating valve 2 and the smaller the opening of the return air electric regulating valve 3; conversely, the lower the temperature in the high-voltage inverter room 13, the smaller the opening of the fresh air electric regulating valve 2 and the larger the opening of the return air electric regulating valve 3.

[0066] In winter, when the outdoor temperature is extremely low, when the heat transfer of the enclosure structure of the high-voltage inverter room 13 is greater than the heat dissipation of the high-voltage inverter cabinet 14, the fresh air electric regulating valve 2 can be closed and the return air electric regulating valve 3 can be fully opened to realize the internal circulation of air and maximize the use of the heat dissipation of the high-voltage inverter. If necessary, the second heating stage 1-4 of the fresh air unit 1 can also be opened for additional heating.

[0067] The external exhaust electric regulating valve 4 and the internal exhaust electric regulating valve 5 are used to adjust the valve opening according to the temperature and pressure signals to control the ratio of the external exhaust air volume and the internal exhaust air volume. The higher the temperature or the higher the pressure in the high-voltage inverter room 13, the larger the opening of the external exhaust electric regulating valve 4 and the smaller the opening of the internal exhaust electric regulating valve 5; conversely, the lower the indoor temperature or the lower the pressure, the smaller the opening of the external exhaust electric regulating valve 4 and the larger the opening of the internal exhaust electric regulating valve 5. By adjusting the external and internal exhaust air volumes, the heat dissipation of the high-voltage inverter is fully utilized to maintain the indoor temperature, achieve the overall thermal balance of the room, and at the same time maintain the pressure balance of the room to prevent the invasion of cold wind and dust due to the negative pressure in the room.

[0068] The natural air inlet electric valve 6 is preferably a heat-insulating electric closed regulating valve. When the fresh air unit 1 is running, the natural air inlet electric valve 6 is closed. It is only opened for air supply when fresh air is used for ventilation and cooling in summer and transition seasons. When the natural air inlet electric valve 6 is opened, the fresh air unit 1 stops running, and the fresh air electric regulating valve 2 and the return air electric regulating valve 3 are closed accordingly, the external exhaust air electric regulating valve 4 is fully opened, and the internal exhaust air electric regulating valve 5 is closed. At this time, only the exhaust fan power of the high-voltage frequency conversion cabinet 14 is used to realize fresh air operation, fully utilize the outdoor natural wind, reduce the energy consumption of mechanical equipment operation, and achieve obvious energy-saving effect.

[0069] The fresh air vent 7 is preferably a single-layer rainproof louver vent, which can be equipped with a primary filter and a medium-efficiency filter. It should be noted that the bottom edge of the fresh air vent 7 should be more than 2 meters above the outdoor floor. When the outdoor area is a green area, the fresh air vent 7 should not be less than 1 meter from the outdoor floor. The return air vent 8 and the internal exhaust vent 12 are preferably single-layer louver vents; the external exhaust vent 9 is preferably a single-layer rainproof louver vent; the natural air inlet 10 is preferably a single-layer rainproof louver vent, which can be equipped with a primary filter. The air supply vent 11 is preferably a double-layer louver vent, and the air supply angle can be adjusted. Each air vent should be arranged reasonably and set on different walls of the building as much as possible. If it is set on the same wall, a certain amount of vertical height difference must be ensured, and the air inlet is set in the lower area of ​​the building, and the air outlet is set in the upper area of ​​the building, so as to form an effective airflow organization and avoid short circuits.

[0070] The working principle of the ventilation system for high-voltage inverter room in severe cold and cold areas described in the present invention is as follows: during winter operation, outdoor fresh air is introduced into the fresh air unit 1 through the fresh air outlet 7 and the fresh air duct, and after preheating, it is mixed with the return air in the high-voltage inverter room 13, and then sent into the high-voltage inverter room 13 by the fan through the air supply duct and the air supply outlet 11. The front air inlet of the high-voltage inverter cabinet 14 inhales the supply air and cools the high-voltage inverter cabinet 14 before being discharged from the exhaust port. During the operation of the ventilation system, the opening of each electric regulating valve is adjusted according to the temperature and pressure in the high-voltage inverter room 13 to control the ratio of fresh air and return air as well as the ratio of internal exhaust air volume to external exhaust air volume. If necessary, the heating stage 2 1-4 is turned on for supplementary heating. In summer and transition seasons, the ventilation system can achieve fresh air operation. At this time, the fresh air unit 1 is closed, the fresh air electric regulating valve 2 and the return air electric regulating valve 3 are closed, the natural air inlet electric valve 6 is opened, and air is supplied through the shared air supply duct and air supply port 11. The front air inlet of the high-voltage frequency conversion cabinet 14 inhales fresh air and cools the cabinet before exhausting it all. The exhaust fan of the high-voltage frequency conversion cabinet 14 provides power to complete the fresh air DC operation.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ventilation system for high-voltage inverter rooms in severe cold and cold regions, characterized in that: The air conditioning unit comprises a fresh air unit, a fresh air duct, an air supply duct, an air inlet duct, a return air duct, an inner exhaust duct and an outer exhaust duct; the fresh air unit is arranged outside the high-voltage frequency converter room, and is composed of a fresh air section, a heating section, a return air section, a second heating section, a fan section and an air supply section connected in sequence; the fresh air section is connected to one end of the fresh air duct, and a fresh air outlet is arranged at the other end of the fresh air duct to communicate with the external atmosphere, and a fresh air electric regulating valve is arranged on the fresh air duct; the heating section and the second heating section are provided with a heater, and the fan section is provided with a fan; the return air section is connected to the return air outlet arranged on the end wall of the high-voltage frequency converter room through the return air duct, and a return air electric regulating valve is arranged on the return air duct; the air supply section is connected to the air supply duct, and the air supply duct extends to the high-voltage frequency converter room, and a plurality of air supply outlets are arranged on the air supply duct to communicate with the high-voltage frequency converter room The room is connected, and the air supply duct is also connected to the natural air inlet arranged on the side wall of the high-voltage frequency converter room through the air inlet duct, and a natural air inlet electric valve is arranged on the air inlet duct; multiple high-voltage frequency converters in the high-voltage frequency converter room are grouped in the corresponding high-voltage frequency converter cabinet; an exhaust outlet is arranged on the top of the high-voltage frequency converter cabinet, and the exhaust outlet is connected to the inner exhaust duct and the outer exhaust duct at the same time, the inner exhaust outlet of the inner exhaust duct is arranged in the high-voltage frequency converter room, and an inner exhaust electric regulating valve is arranged on the inner exhaust duct; the outer exhaust outlet of the outer exhaust duct is arranged on the side wall of the high-voltage frequency converter room and is connected to the external atmosphere, and an outer exhaust electric regulating valve is arranged on the outer exhaust duct; the fresh air electric regulating valve, the return air electric regulating valve, the natural air inlet electric valve, the inner exhaust air electric regulating valve and the outer exhaust air electric regulating valve are respectively connected to the control system.

2. A ventilation system for high-voltage frequency converter room in severe cold and cold regions according to claim 1, characterized in that: A fan room is arranged outside the high-voltage frequency converter room, and a fresh air unit is arranged in the fan room; a fresh air inlet of the fresh air unit is arranged on a side wall of the fan room.

3. A ventilation system for high-voltage frequency converter room in severe cold and cold regions according to claim 1, characterized in that: The heater is an electric heater with multiple adjustment levels.

4. A ventilation system for high-voltage frequency converter room in severe cold and cold regions according to claim 1, characterized in that: The natural air intake electric valve is a heat-insulating electric closed regulating valve.

5. The ventilation system for high-voltage frequency converter room in severe cold and cold regions according to claim 1 is characterized in that: The fresh air inlet is a single-layer rainproof louver inlet; the return air inlet and the inner exhaust air outlet are single-layer louver inlets; the outer exhaust air outlet is a single-layer rainproof louver inlet; the natural air inlet is a single-layer rainproof louver inlet and is equipped with a primary filter; the air supply outlet is a double-layer louver inlet with an adjustable air supply angle.

6. A ventilation system for high-voltage frequency converter rooms in severe cold and cold regions according to claim 5, characterized in that: A primary filter and a medium filter are provided at the fresh air inlet; a primary filter is provided at the natural air inlet.

7. A method for operating a ventilation system for a high-voltage inverter room in severe cold or cold regions as claimed in any one of claims 1 to 6, characterized in that: The specific process includes the following: 1) During winter operation, the fresh air unit is started, and the fresh air introduced from the outside is preheated in the first stage of heating and mixed with the return air in the high-voltage inverter room, and then sent into the high-voltage inverter room through the air supply duct and multiple air supply ports; according to the indoor temperature of the high-voltage inverter, the mixing ratio of fresh air and return air is controlled. When the indoor temperature is higher than the set value, the fresh air volume is increased and the return air volume is reduced; conversely, when the indoor temperature is lower than the set value, the fresh air volume is reduced and the return air volume is increased. If the set temperature is still not reached, the second stage of heating is turned on for additional heating; The cooling air inlet on the front of the high-voltage frequency converter cabinet draws in relatively cold air from the air supply port into the high-voltage frequency converter room, and dissipates heat and cools the high-voltage frequency converter in the high-voltage frequency converter cabinet. The hot air after heat exchange is discharged to the outside through the external exhaust port and / or to the room through the internal exhaust port. When the indoor temperature is higher than the set value, the exhaust volume of the external exhaust port is increased and the exhaust volume of the internal exhaust port is reduced; conversely, when the indoor temperature is lower than the set value, the exhaust volume of the external exhaust port is reduced and the exhaust volume of the internal exhaust port is increased, so as to meet the heat dissipation requirements of the high-voltage frequency converter cabinet and the indoor heating requirements at the same time; In extremely cold weather, if the heat transferred outward from the high-voltage inverter room is greater than the heat dissipation of the high-voltage inverter cabinet, close the fresh air electric regulating valve and fully open the return air electric regulating valve to achieve internal air circulation; if the temperature is still lower than the set value, open the second stage of heating for additional heating; 2) When operating in summer and transition seasons, the fresh air unit is stopped, the fresh air electric regulating valve, return air electric regulating valve, internal exhaust air electric regulating valve are closed, the external exhaust air electric regulating valve and natural air intake electric valve are opened, and the high-voltage inverter room is supplied with air through the natural air inlet; the replenished natural air enters the high-voltage inverter room through the air supply duct and air supply port, and the replenished fresh air is sucked in by the air inlet on the front of the high-voltage inverter cabinet. The replenished fresh air is completely discharged after cooling the high-voltage inverter, and the power of the high-voltage inverter cabinet's own exhaust fan is used to achieve fresh air DC operation.

8. The working method of the ventilation system of the high-voltage inverter room in severe cold and cold regions according to claim 7 is characterized in that: The external exhaust electric regulating valve and the internal exhaust electric regulating valve adjust the valve opening according to the temperature and pressure signals to control the ratio of the external exhaust air volume to the internal exhaust air volume; when the indoor temperature or pressure of the high-voltage inverter is higher than the set value, the opening of the external exhaust electric regulating valve is increased and the opening of the internal exhaust electric regulating valve is reduced; when the indoor temperature or pressure of the high-voltage inverter is lower than the set value, the opening of the external exhaust electric regulating valve is reduced and the opening of the internal exhaust electric regulating valve is increased; the heat dissipation of the high-voltage inverter cabinet is used to maintain the indoor temperature of the high-voltage inverter to achieve the overall thermal balance of the room, and at the same time, the exhaust air volume is used to adjust the indoor pressure to maintain the indoor pressure balance of the high-voltage inverter.

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