Skid-mounted high-voltage variable-frequency electric control device and control method thereof

Abstract

The invention relates to the field of high-voltage variable-frequency electric control devices, and provides a skid-mounted high-voltage variable-frequency electric control device and a control method thereof.The skid-mounted high-voltage variable-frequency electric control device comprises a device body which is a skid block of a skid-mounted high-voltage variable-frequency electric control room and is provided with a ventilation opening for heat dissipation and ventilation and an internal space; the fresh air system and the device body are integrally arranged, the fresh air system comprises a fresh air fan, an air mixing duct and a refrigeration module, and the air mixing duct is arranged in an interlayer of the outer wall of the device body and communicates with an air outlet of the fresh air fan and the internal space; the refrigeration module is used for reducing the air flow temperature in the mixed air duct; the system further comprises an internal space temperature detection module, a humidity sensing module and a control module. Cold air blown in by the fresh air fan and heat dissipation air of the device body are mixed and then enter the internal space of the device body, so that the situation that supercooled fresh air directly enters the internal space and makes contact with internal high-temperature air to generate condensate water, and the condensate water flows back to cause harm to safe operation of the device body is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage frequency conversion electric control devices, and in particular to a skid-mounted high-voltage frequency conversion electric control device and a control method thereof. Background Art

[0002] High-voltage frequency conversion electronic control device is a complete set of equipment that integrates high-voltage frequency converter, control system, cooling and heat dissipation system and other components. It is usually used in industrial fields such as oil and gas fields to achieve frequency conversion speed regulation and control of high-power motors.

[0003] Among them, the skid-mounted high-voltage frequency conversion electric control device is an integrated device based on the improvement of the traditional civil structure substation of 10kV and below, integrating high-voltage function and frequency conversion function. The skid-mounted high-voltage frequency conversion electric control device has the advantages of smaller footprint, shorter construction period, higher economic and environmental protection, stronger environmental perception ability, and more suitable for unmanned operation.

[0004] However, the cooling methods of the cooling system of the current skid-mounted high-voltage variable frequency electric control device include natural cooling, convection cooling and liquid cooling. Among them, the convection cooling through the fan has a low efficiency and is difficult to meet the cooling needs in a high temperature environment.

[0005] In response to this problem, a Chinese utility model patent with patent number 201120198172.6 proposed a cold wind intelligent adjustment device for a skid-mounted high-voltage variable frequency electric control device, which uses a fresh air blower instead of a fan to introduce external fresh air to cool the temperature inside the device body by convection, and sucks the liquid inside the skid-mounted high-voltage variable frequency electric control device through a compressor to compress and evaporate, thereby achieving a dehumidification effect. Therefore, the cold wind intelligent adjustment device cannot eliminate the generation of condensed water from the root, so as to avoid the condensed water from causing serious harm to the normal operation of the skid-mounted high-voltage variable frequency electric control device.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] To this end, the present invention provides a skid-mounted high-voltage variable-frequency electronic control device and a control method thereof, which introduces an appropriate amount of cold air through a fresh air fan and mixes it with the heat dissipation air of the device body to a suitable temperature that will not condense, thereby preventing overcooled fresh air from directly entering the interior of the skid and contacting the high-temperature air inside to produce condensed water, and the condensed water reflux from causing harm to the safe operation of the device body; the present invention also controls the opening degree of the opening and closing part of the mixing air duct and the cooling capacity of the refrigeration module, so that the fresh air in the mixing air duct can also be used to improve the heat dissipation efficiency of the heat dissipation air of the device body, thereby realizing multiple functions of the fresh air system under different external temperatures.

[0008] To achieve the above object, the present invention proposes a skid-mounted high-voltage frequency conversion electric control device, comprising: The device body is a skid block of a skid-mounted high-voltage variable-frequency electric control room, having a vent for heat dissipation and ventilation and an internal space separated from the vent; A fresh air system is integrated with the device body, comprising a fresh air fan, a mixed air duct and a refrigeration module, wherein the fresh air fan is provided with an air inlet and an air outlet, the mixed air duct is provided in the outer wall interlayer of the device body, the mixed air duct is communicated with the air outlet and the internal space respectively, and an opening and closing part for controlling the communication and isolation of the mixed air duct and the internal space is provided at the connection point between the mixed air duct and the internal space; the refrigeration module is used to reduce the air flow temperature in the mixed air duct; An internal space temperature detection module, whose detection end is arranged on the outer wall of the device body, is used to obtain the external ambient temperature; A humidity sensing module, whose detection end is arranged inside the air mixing duct, for obtaining the humidity inside the air mixing duct; The control module is communicatively connected with the device body, the fresh air fan, the opening and closing part, the refrigeration module, the internal space temperature detection module and the humidity sensing module, and is used to control the air output of the fresh air fan, the opening degree of the opening and closing part and the cooling capacity of the refrigeration module according to the operating state of the device body, the ambient temperature and the humidity.

[0009] The present invention uses a fresh air fan to introduce an appropriate amount of fresh air into a mixed air duct connected to the main body of the high-voltage variable frequency electric control device when the external temperature is low, so that the fresh air is mixed with the heat dissipation air of the device main body in the mixed air duct to a suitable temperature that will not condense, thereby preventing the overcooled fresh air from directly entering the interior of the skid and contacting the high-temperature air inside to generate condensed water, and the reflux of the condensed water endangering the safe operation of the device main body, thereby ensuring the safe operation of the device main body, and by controlling the opening degree of the opening and closing part of the mixed air duct and the cooling capacity of the refrigeration module, the fresh air in the mixed air duct can also be used to accelerate the heat dissipation.

[0010] Further, the refrigeration module includes a cold air blower; The cold air fan and the fresh air fan are installed in an installation cavity formed by a plurality of packaging walls, and the packaging walls are installed on the outer wall; The air inlet is connected to a refrigeration air duct of a cold air blower, and the air inlet is provided with an exhaust blocking portion for preventing the airflow from backflowing into the cold air blower.

[0011] In particular, the cooling cost is further reduced by the cold air blower, and the air output of the fresh air system is increased. Furthermore, the air inlet of the cold air blower is provided with anti-sand louvers, filters and anti-sand peak sheets in sequence along the air flow direction; The blades of the sand-proof shutters have a bending structure, and the bending structures of two adjacent blades are staggered to form a serpentine airflow channel; The airflow flowing into the cold air blower carries impurities, passes through the airflow channel and the filter to separate the airflow from some impurities, and then impacts the anti-sand peak sheet, so that the remaining impurities are blocked by the anti-sand peak sheet and then fall naturally and are separated from the airflow.

[0012] In particular, it is ensured that when the skid-mounted device body is set in an environment with a lot of impurities such as wind and sand, the air flow sucked by the cold air fan will not affect the operation of the device body, and the cold air fan can operate stably.

[0013] Furthermore, the fresh air system further comprises a heat recovery chamber, and the device body further comprises a connecting pipeline connected to the vent; One side wall of the heat recovery chamber is assembled and connected to the connecting pipeline, and the other side wall is assembled and connected to the air inlet, and the fresh air fan is also provided with a through hole connected to the outside; A switching part for controlling conduction and shutoff is provided at the connection point between the vent and the heat recovery chamber; The air inlet is connected to the air inlet through the heat recovery chamber, and the heat recovery chamber is connected to the outside through the louver.

[0014] Furthermore, at least two sets of the fresh air systems are installed on the outer wall; The air inlets of the multiple cold air fans are all connected to the same heat recovery chamber; The heat recovery chamber has a plurality of polygonal mixed airflow chambers inside, and the plurality of mixed airflow chambers form a honeycomb structure for mixing the airflows of the connecting pipeline and the air inlet; The control module includes a remote controller and a distributed control unit; The multiple distributed control units are communicatively connected to the multiple opening and closing parts, the multiple humidity sensing modules and the multiple on-off parts of the multiple fresh air systems, and are communicatively connected to a remote controller. The remote controller is also communicatively connected to the main controller of the device body, so that the remote controller can coordinately control the operating status of the device body and the operating status of the multiple fresh air systems.

[0015] In particular, when the skid-mounted device body is placed in an environment with a relatively low external temperature, the airflow with a certain temperature can flow back into the fresh air fan through the heat recovery chamber, so that the temperature of the airflow inhaled and discharged by the fresh air fan will not be too low.

[0016] Further, the high-voltage variable frequency electric control device further comprises an internal temperature detection module for detecting the internal temperature of the device body, and / or an air flow velocity detection module for detecting the air flow velocity of the air mixing duct, and / or an internal space air quality detection module, which is arranged on the outer wall and is used to detect the air quality of the internal space; The control module sets the initial cooling capacity of the refrigeration module according to the ambient temperature and the internal temperature, and / or the control module sets the initial opening degree of the opening and closing part according to the air flow rate, and / or the control module sets the initial air output of the fresh air fan at least according to the air quality.

[0017] To achieve the above object, the present invention further provides a control method for a skid-mounted high-voltage variable frequency electric control device, comprising: The control module receives the operating status of the device body, the ambient temperature obtained by the internal space temperature detection module, and the humidity obtained by the humidity sensing module, and controls the air output of the fresh air fan, the opening degree of the opening and closing part, and the cooling capacity of the refrigeration module according to the operating status, the ambient temperature, and the humidity.

[0018] Further, the control module determines the anti-condensation state, the heat dissipation state or the normal state of the skid-mounted high-voltage variable frequency electric control device according to the operating state, the ambient temperature and the humidity; In the anti-condensation state, the control module controls the fresh air fan to operate at a first air volume, the opening and closing portion to open at a first opening degree, and the refrigeration module to not perform refrigeration, so that the hot air dissipated by the device body and the cold air discharged by the fresh air fan are mixed in the air mixing duct without generating condensed liquid; In the heat dissipation state, the control module controls the fresh air fan to operate at the second air output volume, the opening and closing part is closed, and the refrigeration module operates at the first refrigeration volume; In a normal state, the control module controls the fresh air blower to operate at a third air output volume, the opening and closing portion is opened at a second opening degree greater than the first opening degree, and the refrigeration module does not perform refrigeration.

[0019] Further, the high-voltage variable frequency electric control device also includes an internal temperature detection module for detecting the internal temperature of the device body, an air flow velocity detection module for detecting the air flow velocity inside the air mixing duct, and an internal space air quality detection module for detecting the air quality of the internal space; The control method comprises: In the heat dissipation state, the control module sets the initial cooling capacity of the refrigeration module according to the difference between the ambient temperature and the internal temperature, and sends a signal to reduce the output frequency to the device body when it is determined that the initial cooling capacity is greater than the upper limit of the cooling capacity; In the heat dissipation state, the control module sets the initial opening degree of the opening and closing portion according to the air flow velocity, and the control module sets the initial air volume of the fresh air fan at least according to the air quality; During the operation of the fresh air blower, the control module dynamically adjusts the first air output volume, the second air output volume or the third air output volume of the fresh air blower according to the air flow velocity.

[0020] Furthermore, the fresh air system further comprises a heat recovery chamber, the heat recovery chamber is connected with the vent and the air inlet, and a switching part for controlling conduction and shutoff is provided at the connection point between the vent and the heat recovery chamber; In the anti-condensation state, the following steps are included: Step S1, the control module stores a plurality of the ambient temperatures, a plurality of the humidity levels and a plurality of the operating states to generate a history database; Step S2: When the control module determines, based on the historical database, that the device body is in an abnormal working state, the control module sends an alarm signal to the device body; Step S3, based on the comparison result between the historical database and the safety threshold, determine whether to open the on-off part; if it is determined that the on-off part is opened, obtain the air pressure value collected by the air pressure sensor and the flow rate value collected by the air flow rate sensor, set the conductivity between the heat recovery chamber and the outside according to the air pressure value, calculate the airflow mixing degree according to the flow rate value and the conductivity, and set the conductivity of the on-off part according to the airflow mixing degree.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. It prevents the overcooled fresh air from directly entering the skid and contacting the high-temperature air inside to produce condensed water, and the condensed water reflux will harm the safe operation of the device, thus ensuring the safe operation of the device; 2. By controlling the opening degree of the opening and closing part of the mixed air duct and the cooling capacity of the refrigeration module, the fresh air in the mixed air duct can also be used to improve the heat dissipation efficiency of the heat dissipation air of the device body, realizing the multiple functions of the fresh air system under different external temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Figure 2 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part A; Figure 3 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part B; Figure 4 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part C; Figure 5It is a schematic diagram of a partial structure of an outer wall of a skid according to an embodiment of the present invention; Figure 6 One embodiment of the present invention Figure 5 A schematic diagram of the local structure of the opening and closing parts of the middle and outer walls; Figure 7 Another embodiment of the present invention is Figure 5 A schematic diagram of the local structure of the opening and closing parts of the middle and outer walls; Figure 8 An embodiment of the present invention Figure 5 A schematic diagram of the local structure on one side of the opening and closing part of the middle and outer walls; Fig. 9 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure of one side of the middle and outer wall shutters; Fig.10 is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to another embodiment of the present invention; Fig.11 is an overall implementation schematic diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Fig.12 is a system schematic diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Fig.13 It is a schematic diagram of the overall flow of a control method of a skid-mounted high-voltage variable-frequency electric control device according to an embodiment of the present invention; Fig.14 It is a schematic diagram of the internal structure of a heat recovery chamber of a skid-mounted high-voltage variable-frequency electric control device according to an embodiment of the present invention.

[0023] Description of the main components in the figure: 1. Fresh air system; 11. Fresh air fan; 111. Centrifugal fan; 112. Exhaust duct; 113. Encapsulation wall; 12. Anti-sand shutters; 121. Hinge mechanism; 122. Motor compartment; 123. Shutters; 124. Lock assembly; 125. Aluminum alloy outer wall; 13. Filter; 14. Opening and closing part; 141. Hydraulic transmission mechanism; 142. Shutters; 143. Fan speed control device; 144. Connecting rod mechanism; 15. Mixed air duct; 16. Cold air fan; 17. Heat recovery chamber; 171. Mixed air flow chamber; 172. Partition partition; 181. First valve; 182. Second valve; 2. Air flow velocity detection module; 3. Internal temperature detection module; 4. Internal space temperature detection module; 5. Internal space air quality Detection module; 6. Control module; 61. Remote controller; 62. Distributed control unit; 7. Device body; 71. Exhaust duct; 711. Wind hood; 712. Duct flange; 72. Connecting pipeline; 721. Hydraulic transmission mechanism of heat recovery chamber; 722. Shutters of heat recovery chamber; 723. Fan speed regulating device of heat recovery chamber; 724. Connecting rod mechanism of heat recovery chamber; 73. On-off part; 74. Outer wall; 741. Outer wall interlayer; 742. Filter; 743. Outer wall opening and closing part; 7431. Hydraulic transmission mechanism of outer wall; 7432. Shutters of outer wall; 7433. Fan speed regulating device of outer wall; 7434. Connecting rod mechanism of outer wall; 7435. Outer wall fan; 7436. Signal collector; 744. Control box; 745. Double corrugated shutters; 746. Outer wall. DETAILED DESCRIPTION

[0024] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0026] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figures 1 to 14 As shown, the present invention provides a skid-mounted high-voltage variable-frequency electric control device and a control method thereof, wherein a proper amount of fresh air is introduced through a fresh air fan 11 to mix with the heat dissipation air of a device body 7 to a suitable temperature without condensation, thereby preventing the overcooled fresh air from directly entering the interior of the skid and contacting the high-temperature air inside to generate condensed water, and the condensed water reflux from causing harm to the safe operation of the device body; the present invention also controls the opening degree of the opening and closing part 14 of the mixing air duct 15 and the cooling capacity of the refrigeration module, so that the fresh air in the mixing air duct 15 can also be used to enhance the heat dissipation efficiency of the heat dissipation air of the device body 7, thereby realizing multiple functions of the fresh air system 1 at different external temperatures.

[0029] in, Figure 1 It is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Figure 2 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part A; Figure 3 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part B; Figure 4 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part C; Figure 5 It is a schematic diagram of a partial structure of an outer wall of a skid according to an embodiment of the present invention; Figure 6 One embodiment of the present invention Figure 5 A schematic diagram of the local structure of the opening and closing parts of the middle and outer walls; Figure 7 Another embodiment of the present invention is Figure 5 A schematic diagram of the local structure of the opening and closing parts of the middle and outer walls; Figure 8 An embodiment of the present invention Figure 5 A schematic diagram of the local structure on one side of the opening and closing part of the middle and outer walls; Fig. 9 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure of one side of the middle and outer wall shutters; Fig.10 is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to another embodiment of the present invention; Fig.11 is an overall implementation schematic diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Fig.12is a system schematic diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Fig.13 It is a schematic diagram of the overall flow of a control method of a skid-mounted high-voltage variable-frequency electric control device according to an embodiment of the present invention; Fig.14 Schematic diagram of the internal structure of a heat recovery chamber of a skid-mounted high-voltage variable frequency electric control device according to an embodiment of the present invention; The components include a fresh air system 1, a fresh air fan 11, a centrifugal fan 111, an exhaust duct 112, a packaging wall 113, a sand-proof shutter 12, a hinge mechanism 121, a motor compartment 122, a shutter 123, a lock assembly 124, an aluminum alloy outer wall 125, a filter 13, an opening and closing portion 14, a hydraulic transmission mechanism 141, shutters 142, a fan speed regulating device 143, a connecting rod mechanism 144, a mixed air duct 15, a cold air fan 16, a heat recovery chamber 17, a mixed air flow chamber 171, a partition partition 172, an air flow velocity detection module first valve 181, a second valve 182, 2, an internal temperature detection module 3, an internal space temperature detection module 4, and an internal space air quality detection module 5. Control module 6, remote controller 61, distributed control unit 62, device body 7, exhaust duct 71, wind hood 711, duct flange 712, connecting pipe 72, heat recovery chamber hydraulic transmission mechanism 721, heat recovery chamber shutter 722, heat recovery chamber fan speed regulating device 723, heat recovery chamber connecting rod mechanism 724, on-off part 73, outer wall 74, outer wall interlayer 741, filter 742, outer wall opening and closing part 743, outer wall hydraulic transmission mechanism 7431, outer wall shutter 7432, outer wall fan speed regulating device 7433, outer wall connecting rod mechanism 7434, outer wall fan 7435, signal collector 7436, control wire box 744, double corrugated shutter 745, outer wall 746. Embodiment 1

[0030] like Figures 1 to 9 ,and Figures 11 to 14As shown, this embodiment proposes a skid-mounted high-voltage variable-frequency electric control device, comprising: a device body 7), which is a skid block of a skid-mounted high-voltage variable-frequency electric control room, having vents for heat dissipation and ventilation and an internal space separated from the vents; a fresh air system 1), which is integrated with the device body, comprising a fresh air fan 11), a mixed air duct 15) and a refrigeration module, the fresh air fan 11 is provided with an air inlet and an air outlet, the mixed air duct 15 is arranged in an outer wall interlayer 741 of the device body 7, the mixed air duct 15 is communicated with the air outlet and the internal space respectively, and an opening and closing portion 14 for controlling the communication and isolation of the mixed air duct 15 and the internal space is provided at the connection between the mixed air duct 15 and the internal space; the refrigeration module is used to reduce lower the air flow temperature in the mixed air duct 15; an internal space temperature detection module 4, a detection end of which is arranged on the outer wall 74 of the device body 7, for obtaining the external ambient temperature; a humidity sensing module, a detection end of which is arranged inside the mixed air duct 15, for obtaining the humidity inside the mixed air duct 15; a control module 6, which is communicatively connected with the device body 7, the fresh air fan 11, the opening and closing part 14, the refrigeration module, the internal space temperature detection module 4 and the humidity sensing module, for controlling the air output of the fresh air fan 11, the opening degree of the opening and closing part 14 and the cooling capacity of the refrigeration module according to the operating state of the device body 7, the ambient temperature and the humidity.

[0031] It should be noted that the fresh air system 1 is integrated with the device body 7 so that the fresh air system 1 cannot be used alone and needs to cooperate with the device body 7, and this structure is intended to solve the anti-condensation and heat dissipation problems of the skid-mounted high-voltage variable frequency electric control device installed in different environments. The fresh air system 1 can be integrated with the device body 7 as an external device, or integrated with the device body 7 as an internal device, and they are encapsulated together by the outer shell.

[0032] It should be noted that the exterior described in this embodiment is the exterior of the entire skid-mounted high-voltage frequency conversion electric control device.

[0033] Therefore, when the external temperature is low, the fresh air fan 11 introduces an appropriate amount of fresh air into the mixed air duct 15 connected to the high-voltage variable frequency electric control device body 7, so that the fresh air is mixed with the heat dissipation air of the device body 7 in the mixed air duct 15 to a suitable temperature that will not condense, thereby avoiding the overcooled fresh air from directly entering the skid and contacting the high-temperature air inside to produce condensed water, and the condensed water reflux causing harm to the safe operation of the device body, thereby ensuring the safe operation of the device body 7, and by controlling the opening degree of the opening and closing part 14 of the mixed air duct 15 and the cooling capacity of the refrigeration module, the fresh air in the mixed air duct 15 can also be used to accelerate.

[0034] Furthermore, the refrigeration module includes a cold air fan 16; the cold air fan 16 and the fresh air fan 11 are assembled in an installation cavity enclosed by a plurality of packaging walls 113, and the packaging wall 113 is installed on the outer wall 74 where the outer wall interlayer 741 is set; the air inlet is connected to the refrigeration air duct of the cold air fan 16, and the air inlet is provided with an exhaust blocking portion to prevent the airflow from flowing back into the cold air fan 16.

[0035] Therefore, the cooling cost is further reduced by the cold air blower 16 and the air output of the fresh air system 1 is increased.

[0036] It is understandable that, in some other possible embodiments, the refrigeration module may be a component with refrigeration function such as a compression refrigerator, a semiconductor refrigerator, etc., and is not limited to the cold air blower 16.

[0037] Furthermore, if Figure 1 As shown, at the air inlet of the cold air fan 16, sand-proof louvers 12, filters 13 and sand-proof peak sheets are sequentially provided along the air flow direction; the blades of the sand-proof louvers 12 have a bending structure, and the bending structures of each two adjacent blades are staggered to form a serpentine air flow channel; the air flow flowing into the cold air fan 16 carries impurities, passes through the air flow channel and the filter 13 to separate the air flow from part of the impurities, and then impacts the sand-proof peak sheet, so that the remaining impurities are blocked by the sand-proof peak sheet and then naturally fall down and are separated from the air flow.

[0038] Therefore, it is ensured that when the skid-mounted device body 7 is set in an environment with a lot of impurities such as wind and sand, the air flow sucked by the cold air fan 16 will not affect the operation of the device body 7, and the cold air fan 16 can operate stably.

[0039] Specifically, a sand collecting portion is further provided at the air inlet of the cold air fan 16, and the sand collecting portion is arranged below the anti-sand peak sheet to collect impurities that fall naturally after being blocked by the anti-sand peak sheet.

[0040] Specifically, Figure 1 As shown, the anti-sand shutter 12 is preferably a double-wave-shaped air intake window. The filter 13 is a detachable primary metal mesh filter 13, or a detachable primary and medium-efficiency dust filter. The double-wave intake structure forcibly changes the direction of the incoming wind, and the wind enters the room through two wave paths. After the sand and dust particles are blown in by the wind and hit the anti-sand peak sheet, they will automatically fall and flow out. The anti-sand shutter 12 effectively prevents sand and dust from entering the cold air blower 16.

[0041] More specifically, Fig. 9As shown, the fan blades of the anti-sand shutter 12 are connected to the motor through the hinge mechanism 121, and the motor is arranged in the motor compartment 122 and is connected to the distributed control unit 62 of the control module 6. The fan blades are also connected to the lock assembly 124 that manually controls the opening and closing of the fan blades. In other possible embodiments, the hinge mechanism 121 and the motor can also be replaced by a hydraulic transmission mechanism.

[0042] Furthermore, the fan blades are made of aluminum alloy with a hollow interior filled with heat-insulating material, and have a good heat-insulating effect. When the ambient temperature is too low, the control module 6 controls the fan blades of the anti-sand shutter 12 to open for a set period of time and then close to achieve internal circulation of the fresh air system 1, preventing the fresh air fan 11 from inhaling excessively cold air from the outside, causing the air flow temperature of the mixed air duct 15 to be too low, and achieving the fresh air system 1 to dissipate heat appropriately without causing the skid-mounted high-voltage variable-frequency electric control device to lose temperature.

[0043] Specifically, Figures 5 to 9 As shown, the vertical outer wall 74 of the device body 7 is provided with a filter 742, an outer wall opening and closing portion 743, a control wire box 744, and a double corrugated shutter 745. The double corrugated shutter 745 preferably has the same structure as the anti-sand shutter 12, and the filter 742 preferably has the same structure as the filter 13. Therefore, the double corrugated shutter 745 may also adopt the structure of a hinge mechanism 121, a motor compartment 122, a shutter 123, a lock assembly 124, and an aluminum alloy outer wall 125.

[0044] Specifically, Figure 1 As shown, an exhaust blocking part is also provided on one side of the sand peak prevention sheet of the air inlet of the cold air blower 16 along the air flow direction. The exhaust blocking part can be an exhaust wind umbrella and its fixing assembly.

[0045] Furthermore, the fresh air system 1 also includes a heat recovery chamber 17, and the device body 7 also includes a connecting pipe 72 connected to the vent; the heat recovery chamber 17 is connected to the connecting pipe 72 and the air inlet, one side wall of the heat recovery chamber 17 is assembled and connected to the connecting pipe 72, and the other side wall is assembled and connected to the air inlet, and the heat recovery chamber 17 / the fresh air fan 11 is also provided with a through hole connected to the outside; the connection between the vent and the heat recovery chamber 17 is provided with a switching part 73 for controlling conduction and shutdown; the air inlet is connected to the heat recovery chamber 17 through the refrigeration air duct and the air inlet, or the heat recovery chamber 17 has a plurality of polygonal mixed airflow chambers 171 inside, and the plurality of mixed airflow chambers 171 form a honeycomb structure for mixing the airflows of the connecting pipe 72 and the air inlet.

[0046] like Fig.14As shown, the heat recovery chamber 17 has a plurality of polygonal mixed airflow chambers 171 inside, and the plurality of mixed airflow chambers 171 form a honeycomb structure for mixing the airflows of the connecting pipe 72 and the air inlet.

[0047] Specifically, Fig.14 As shown, the heat recovery chamber 17 is provided with a cross-shaped partition partition 172 to form four partitions. The partition partition 172 has fine holes to allow the airflows between the partitions to communicate with each other. Each partition is provided with a plurality of mixed airflow chambers, which extend the flow path of the airflow in the heat recovery chamber 17 and ensure that the external airflow entering the heat recovery chamber 17 from the louver and the hot airflow entering from the connecting pipe 72 can be fully mixed. The mixed airflow chamber 171 is preferably a regular hexagon.

[0048] Specifically, the connecting pipeline 72 can be a ventilation hose to facilitate the coordinated installation of the heat recovery chamber 17 and the device body 7 .

[0049] In particular, when the external temperature is low, the airflow with a certain temperature can flow back into the fresh air fan 11 through the heat recovery chamber, so that the temperature of the airflow discharged by the fresh air fan 11 will not be too low.

[0050] Furthermore, the high-voltage frequency conversion electronic control device also includes an internal temperature detection module 3, which is used to detect the internal temperature of the device body 7, and / or an air flow velocity detection module 2, which is used to detect the air flow velocity of the mixed air duct 15, and / or an internal space air quality detection module 5, which is arranged on the outer wall 74 of the device body 7 and is used to detect the air quality of the internal space; the control module 6 sets the initial cooling capacity of the refrigeration module according to the ambient temperature and the internal temperature, and / or the control module 6 sets the initial opening degree of the opening and closing part 14 according to the air flow velocity, and / or the control module 6 sets the initial air output of the fresh air fan 11 at least according to the air quality.

[0051] Specifically, in this embodiment, Figure 1 and 2 The opening and closing portion 14 shown in the figure includes a hydraulic transmission mechanism 141, a shutter 142, a fan speed regulating device 143 and a connecting rod mechanism 144. Figure 1 and 4 A heat recovery chamber opening and closing portion is provided at the connection point between the exhaust pipe 71 and the connecting pipe 72 shown in the figure, and the heat recovery chamber opening and closing portion includes a heat recovery chamber hydraulic transmission mechanism 721, a heat recovery chamber shutter 722, a heat recovery chamber fan speed regulating device 723 and a heat recovery chamber connecting rod mechanism 724. Figures 5 to 8The outer wall 74 (specifically the side wall of the device body 7 and the skid) is provided with an outer wall opening and closing part 743, and the outer wall opening and closing part 743 includes an outer wall hydraulic transmission mechanism 7431, an outer wall shutter 7432, an outer wall fan speed regulating device 7433, an outer wall connecting rod mechanism 7434, an outer wall fan 7435 and a signal collector 7436. The fan speed regulating device 143, the heat recovery chamber fan speed regulating device 723 and the outer wall fan speed regulating device 7433 are speed regulating motors, preferably variable frequency motors.

[0052] The connecting rod mechanism 144 / heat recovery chamber connecting rod mechanism 724 / outer wall connecting rod mechanism 7434 includes a driving rod and a plurality of connecting rods whose ends are fixed to one side of the driving rod. The output shaft of the fan speed regulating device 143 / heat recovery chamber fan speed regulating device 723 / outer wall fan speed regulating device 7433 rotates, driving the hydraulic transmission mechanism 141 / heat recovery chamber hydraulic transmission mechanism 721 / outer wall hydraulic transmission mechanism 7431 to extend and retract, thereby driving the connecting rod mechanism 144 / heat recovery chamber connecting rod mechanism 724 / outer wall connecting rod mechanism 7434 to move axially, thereby driving the louvers 142 / heat recovery chamber louvers 722 / outer wall louvers 7432 to move and tilt inward, thereby realizing the control of the opening of the louvers by controlling the output shaft speed of the speed regulating device.

[0053] Specifically, a configuration of the air flow velocity detection module 2, the internal temperature detection module 3, and the internal space temperature detection module 4 is as follows: Figure 3 As shown, they are arranged in the vertical outer wall 74 of the device body 7. Another arrangement of the air flow velocity detection module 2, the internal temperature detection module 3, and the internal space temperature detection module 4 is as follows Figure 7 As shown, the air flow velocity detection module 2 is arranged in the outer wall interlayer 741 between the outer wall opening and closing part 743 and the filter screen 742, and the internal temperature detection module 3 and the internal space temperature detection module 4 are arranged below the outer wall opening and closing part 743.

[0054] Specifically, Figure 6 As shown, the remote controller 61 or the distributed control unit 62 communicates with the outer wall fan speed regulating device 7433 through the control box 744.

[0055] Specifically, Figure 8 As shown, the remote controller 61 or the distributed control unit 62 preferably communicates with the fan speed regulating device 143 and the outer wall fan speed regulating device 7433 through the control box 744, and then controls the louvers 142 and the heat recovery chamber louvers 722. The signal collector 7436 converts the signals collected by the sensors on the inside and outside of the outer wall 74 into electrical signals.

[0056] As a specific implementation, the high-voltage variable frequency electric control device includes an internal temperature detection module 3, an air flow velocity detection module 2 and an internal space air quality detection module 5. Specifically, Figure 1 As shown, the air mixing duct 15 and the opening and closing part 14 are arranged in the cross beam at the top of the device body 7, and the internal space temperature detection module 4, the internal temperature detection module 3, the air flow velocity detection module 2 and the internal space air quality detection module 5 are arranged in the side beam at the top of the device body 7.

[0057] Specifically, the overall implementation of the skid-mounted high-voltage frequency conversion electric control device described in this embodiment is as follows: Fig.11 As shown, the exhaust duct 71 connected to the skid that needs heat dissipation includes a wind hood 711 and an air duct flange 712. The on-off portion 73 is preferably an air duct flange 712. The sand-proof shutters 12 are preferably arranged on three side walls of the pipeline. A first valve 181 is provided at the connection between the heat recovery chamber 17 and the fresh air fan 11, and a second valve 182 is provided at the connection between the fresh air fan 11 and the outside.

[0058] Specifically, the first valve 181, the second valve 182, the shutter 142, the heat recovery chamber shutter 722, and the outer wall shutter 7432 are all temperature controlled and opened and closed according to the set conditions, specifically: An electric heating plate is also provided in the fresh air blower 11, which is used for heating in the sled in winter or maintenance season. When the temperature is lower than 5°C (adjustable), the second valve 182 and the heat recovery chamber shutter 722 are opened, and the first valve 181, the outer wall shutter 7432, and the shutter 142 are closed; when the temperature reaches 15°C (adjustable), the second valve 182 and the heat recovery chamber shutter 722 are closed, and the first valve 181, the outer wall shutter 7432, and the shutter 142 are opened. The above control part is completed by the control box of the fresh air unit, that is, the remote controller 61. (All the shutters are electric shutters DC24, three-wire control, and the control box has reserved wiring terminals).

[0059] When the temperature inside the skid reaches 25°C, the second valve 182 is opened, the first valve 181 and the heat recovery chamber louver 722 are closed, and fresh air is introduced for cooling.

[0060] When the temperature inside the skid reaches 35°C, the cold air fan 16 is turned on to assist in cooling. When the temperature drops to 30°C, the cold air fan 16 is turned off. During this period, the fresh air fan 11 can normally take in air.

[0061] According to the setting of the pressure difference meter, when the air inlet and outlet pressures of the fresh air fan 11 reach the preset values, an alarm is triggered, prompting the filter 13 and the filter screen 742 to be cleaned or replaced.

[0062] The system structure of the skid-mounted high-voltage frequency conversion electric control device is as follows: Fig.12As shown, the internal space temperature detection module 4 and the humidity sensing module are preferably outdoor temperature sensors, the internal temperature detection module 3 is preferably an indoor temperature and humidity sensor, and also has the function of detecting the humidity inside the mixed air duct 15, and the internal space air quality detection module 5 is an outdoor cleanliness sensor. The remote controller 61 is preferably a remote central management system, and the distributed control unit 62 is preferably a ventilation system processing unit. The air output of the fresh air fan 11 is controlled by the fan speed regulating device 143 of the fresh air fan 11. The fan speed regulating device 143 enables the fan of the fresh air fan 11 to have high, medium and low three-speed speed control. It can be understood that the exhaust volume of the skid-mounted high-voltage variable frequency electric control device is determined by the air output of the fresh air fan 11 and the opening degree of the opening and closing part 14.

[0063] The working process of the skid-mounted high-voltage frequency conversion electric control device is as follows: Figure 1 As shown, the airflow direction is as follows Figure 1 As shown by the arrows in , when the refrigeration module is not working, the fresh air fan 11 flows in and discharges the airflow of the heat dissipation cycle or the external airflow. When the refrigeration module is working, the fresh air fan 11 flows in and discharges the airflow of the heat dissipation cycle or the external airflow whose temperature is lower than that of the heat dissipation cycle.

[0064] Therefore, in this embodiment, an appropriate amount of fresh air is introduced through the fresh air fan 11 to mix with the heat dissipation air of the device body 7 to a suitable temperature that will not condense, thereby fundamentally avoiding the contact between the overheated heat dissipation air and the external low-temperature air to produce condensed water, and the reflux of condensed water to endanger the safe operation of the device body 7; by controlling the opening degree of the opening and closing part 14 of the mixed air duct 15 and the cooling capacity of the refrigeration module, the fresh air in the mixed air duct 15 can also be used to enhance the heat dissipation efficiency of the heat dissipation air of the device body 7, thereby realizing the multiple functions of the fresh air system 1 at different external temperatures. Embodiment 2

[0065] like Figures 2 to 14 As shown, this embodiment provides a skid-mounted high-voltage frequency conversion electric control device based on the first embodiment. The difference between the skid-mounted high-voltage frequency conversion electric control device in this embodiment and the first embodiment is that at least two groups of the fresh air system 1 are provided.

[0066] Furthermore, at least two groups of the fresh air systems 1 are installed on the outer wall 74; the air inlets of multiple cold air fans 16 are all connected to the same heat recovery chamber 17; the control module 6 includes a remote controller 61 and a distributed control unit 62; multiple distributed control units 62 are correspondingly communicated with multiple opening and closing parts 14, multiple humidity sensing modules and multiple on-off parts 73 of multiple groups of fresh air systems 1, and are communicated with a remote controller 61, and the remote controller 61 is also communicated with the main controller of the device body 7, so that the remote controller 61 can coordinately control the operating status of the device body 7 and the operating status of multiple groups of fresh air systems 1.

[0067] Furthermore, a switching unit for controlling on and off is provided at the connection point between the vent and the heat recovery chamber 17 ; the air inlet of the fresh air fan 11 is connected to the internal space through the refrigeration air duct of the cold air fan 16 and the heat recovery chamber 17 .

[0068] It can be understood that the distributed control unit 62 has the functions of remote signaling, remote measurement and remote control of exhaust information, and can transmit information data to the remote controller 61 for centralized management and intelligent control, with a high degree of intelligence.

[0069] Preferably, Fig.10 As shown, the fresh air system 1 is symmetrically provided with two groups, and the air inlets of the two groups of cold air blowers 16 are connected to the heat recovery chamber 17, and the heat recovery chamber 17 is provided with a through hole connected to the internal space. The skid-mounted high-voltage variable frequency electric control device is preferably a skid-mounted high-voltage variable frequency electric control cabinet, which has an exhaust duct 71, and the vent is the opening of the exhaust duct 71, and the exhaust duct 71 is connected to the heat recovery chamber 17 through a connecting duct 72.

[0070] Therefore, in this embodiment, when the temperature of the internal space is low, the air flow with a certain temperature can flow back into the fresh air fan 11 through the heat recovery chamber 17, so that the temperature of the air flow discharged by the fresh air fan 11 will not be too low; through the two groups of fresh air systems 1, the anti-condensation and heat dissipation effects of the heat dissipation ducts at different positions of the device body 7 are guaranteed, so that the skid-mounted high-voltage variable frequency electronic control device has better anti-condensation and heat dissipation effects. Embodiment 3

[0071] like Figures 1 to 14 As shown, this embodiment, based on the first or second embodiment, provides a control method for a skid-mounted high-voltage variable frequency electric control device, including: the control module 6 receives the operating status of the device body 7, the ambient temperature obtained by the internal space temperature detection module 4, and the humidity obtained by the humidity sensing module, and controls the air output of the fresh air fan 11, the opening degree of the opening and closing part 14, and the cooling capacity of the refrigeration module according to the operating status, the ambient temperature and the humidity.

[0072] Furthermore, the control module 6 determines whether the skid-mounted high-voltage variable-frequency electric control device is operating in an anti-condensation state, a heat dissipation state or a normal state according to the operating state, the ambient temperature and the humidity; in the anti-condensation state, the control module 6 controls the fresh air fan 11 to operate at a first air output volume, the opening and closing part 14 to open at a first opening degree, and the refrigeration module not to perform refrigeration, so that the hot air dissipated by the device body 7 and the cold air discharged by the fresh air fan 11 will not produce condensed liquid after mixing in the mixed air duct 15; in the heat dissipation state, the control module 6 controls the fresh air fan 11 to operate at a second air output volume, the opening and closing part 14 to close, and the refrigeration module to operate at the first cooling capacity; in the normal state, the control module 6 controls the fresh air fan 11 to operate at a third air output volume, the opening and closing part 14 to open at a second opening degree greater than the first opening degree, and the refrigeration module does not perform refrigeration.

[0073] It can be understood that when the anti-condensation state is operated when the internal space of the skid-mounted high-voltage variable frequency electric control device is relatively cold and the device body 7 is in a high-frequency operation state, at this time, it can be avoided that the heat dissipation hot air reaching a higher temperature directly contacts the cold air in the internal space to produce condensed water. When the heat dissipation state is operated when the internal space of the skid-mounted high-voltage variable frequency electric control device is relatively hot and the device body 7 is in a high-frequency operation state, at this time, the cold air of the fresh air fan 11 passing through the refrigeration module is used to accelerate the heat dissipation of the device body 7 at the vent. When the normal state is operated when the temperature of the internal space of the skid-mounted high-voltage variable frequency electric control device is moderate and the device body 7 is not in a high-frequency operation state, at this time, the fresh air system 1 can be operated in a low-power, low-energy consumption manner. The coordinated control described in Example 2 is the above-mentioned control process. In specific application scenarios, the anti-condensation state is mostly operated in winter, the heat dissipation state is mostly operated in summer, and the normal state is mostly operated in spring and autumn.

[0074] Furthermore, the high-voltage variable frequency electric control device also includes an internal temperature detection module 3 for detecting the internal temperature of the device body 7, an airflow velocity detection module 2 for detecting the airflow velocity inside the mixed air duct 15, and an internal space air quality detection module 5 for detecting the air quality of the internal space; the control method includes: in the heat dissipation state, the control module 6 sets the initial cooling capacity of the refrigeration module according to the difference between the ambient temperature and the internal temperature, and when it is determined that the initial cooling capacity is greater than the upper limit of the cooling capacity, sends a signal to reduce the output frequency to the device body 7; in the heat dissipation state, the control module 6 sets the initial opening degree of the opening and closing part 14 according to the airflow velocity, and the control module 6 sets the initial air volume of the fresh air fan 11 at least according to the air quality; during the operation of the fresh air fan 11, the control module 6 dynamically adjusts the first air volume, the second air volume or the third air volume of the fresh air fan 11 according to the airflow velocity.

[0075] It can be understood that the control module 6 adjusts the first air volume of the fresh air fan 11 according to the air flow velocity, so that when the internal space of the skid-mounted high-voltage variable frequency electric control device is relatively cold, the cold air discharged by the fresh air fan 11 will not be fully mixed and discharged with the heat dissipation hot air of the device body 7 due to the fast air flow velocity discharged by the fresh air fan 11 in the mixed air duct 15, resulting in condensation. The control module 6 adjusts the second and third air volumes of the fresh air fan 11 according to the air flow velocity, ensuring that the exhaust air velocity of the fresh air fan 11 is moderate and the heat dissipation efficiency of the skid-mounted high-voltage variable frequency electric control device is moderate.

[0076] Furthermore, the control module 6 sets the threshold of the opening degree and the threshold of the air volume of the fresh air fan 11 according to the air quality, and when the first air volume, the second air volume or the third air volume is adjusted to be greater than the air volume threshold, the fresh air fan 11 is controlled to operate at the air volume threshold. Therefore, it is ensured that the fresh air system 1 does not inhale too much wind and sand.

[0077] Furthermore, the high-voltage variable frequency electric control device also includes an internal temperature detection module 3 for detecting the internal temperature of the device body 7, an airflow velocity detection module 2 for detecting the airflow velocity inside the mixed air duct 15, and an internal space air quality detection module 5 for detecting the air quality of the internal space; the control method includes: in the heat dissipation state, the control module 6 sets the initial cooling capacity of the refrigeration module according to the difference between the ambient temperature and the internal temperature, and when it is determined that the initial cooling capacity is greater than the upper limit of the cooling capacity, sends a signal to reduce the output frequency to the device body 7; in the heat dissipation state, the control module 6 sets the initial opening degree of the opening and closing part 14 according to the airflow velocity, and the control module 6 sets the initial air volume of the fresh air fan 11 at least according to the air quality; during the operation of the fresh air fan 11, the control module 6 dynamically adjusts the first air volume, the second air volume or the third air volume of the fresh air fan 11 according to the airflow velocity.

[0078] Specifically, the output frequency is the output frequency of the frequency converter of the device body 7 .

[0079] Specifically, the analog signals collected by the airflow velocity detection module 2, the internal temperature detection module 3, the internal space temperature detection module 4 and other components are received and sent to the distributed control unit 62. After the distributed control unit 62 processes the collected analog signals, the distributed control unit 62 transmits the information data to the remote controller 61 through serial communication to realize remote monitoring and data recording. Through real-time integration and processing of the data, the remote controller 61 determines whether to issue the instruction information for starting the opening and closing part 14 and the fresh air fan 11 according to the collected information, and the instruction information is sent to the distributed control unit 62. The distributed control unit 62 determines whether to start the hydraulic transmission device according to the instruction information, open the shutter 142 of the opening and closing part 14, and start the fan speed regulating device 143 at the same time to control the speed of the fresh air fan 11 and the air volume of the fresh air fan 11, so as to realize the intelligent air supply of the intelligent fresh air fan 11.

[0080] Specifically, the air quality of the internal space is collected in real time through the internal space air quality detection module 5 and sent to the distributed control unit 62. The distributed control unit 62 transmits the information to the remote controller 61 through serial port communication. When the remote controller 61 determines whether the air quality reaches the warning value, if it reaches it, it issues a warning instruction to prompt the start of the cold air fan 16 to meet the operating environment requirements.

[0081] Specifically, the opening degree of the opening and closing portion 14 is set accordingly according to the air output of the fresh air fan 11 , that is, the size and number of the ventilation holes opened by the shutters 142 of the opening and closing portion 14 .

[0082] In the anti-condensation state, the following steps are included: step S1, the control module 6 stores multiple ambient temperatures, multiple humidity levels and multiple operating states to generate a historical database; step S2, when the control module 6 determines that the device body 7 is in an abnormal working state based on the historical database, the control module 6 sends an alarm signal to the device body 7; step S3, based on the comparison result of the historical database and the safety threshold, determine whether to turn on the on-off part 73, if it is determined that the on-off part 73 is turned on, the air pressure value collected by the air pressure sensor and the flow rate value collected by the air flow rate sensor are obtained, the conductivity between the heat recovery chamber 17 and the outside world is set according to the air pressure value, and the conductivity of the on-off part 73 is dynamically PID controlled according to the flow rate value and the conductivity.

[0083] It is known from experiments that the air pressure value reflects the degree of airflow overflow in the heat recovery chamber 17. When a large amount of airflow flows into the louver of the heat recovery chamber 17, the airflow fills the heat recovery chamber 17. At this time, the louver cold airflow in the heat recovery chamber 17 is much greater than the hot airflow in the connecting pipeline 72, and it is impossible to achieve the purpose of mixing into an airflow with a more suitable temperature and not too cold. Therefore, the difference between the air pressure value and the standard value is set inversely proportional to the opening angle of the louver, so that when the air pressure is high and the louver cold airflow is large, the inflow of the louver cold airflow is reduced, and when the air pressure is low and the louver cold airflow is small, the inflow of the louver cold airflow is increased. The inverse proportional coefficient is preferably -13.5, and the standard value is preferably 135kPa.

[0084] The conductivity is the opening angle of the louver, and the difference between the flow rate value and the standard flow rate value is used as an error to perform dynamic PID control on the conductivity of the on-off part 73. The dynamic PID control is as follows: if the difference exceeds 0.5 m / s, the proportional gain is set to be greater than the integral gain and the differential gain to make a faster adjustment. If the flame height is lower than 0.5 m / s and greater than 0.2 m / s, the integral gain is set to be greater than the proportional gain and the differential gain to make a medium-speed and relatively smooth adjustment. If the flame height is lower than 0.2 m / s, the proportional gain is set to 0, and only the integral gain and the differential gain are performed to achieve a slow and smooth adjustment. Among them, the standard flow rate value is proportional to the conductivity, and its proportional coefficient is preferably 65.

[0085] Furthermore, the remote controller 61 is equipped with a spatiotemporal big data system, which fits the predicted temperature of the day according to the temperature changes of the internal space in recent days, and then sets the initial opening of the on-off part 73 and the opening and closing part. Specifically, the predicted temperature at this time is the weighted average of the temperatures in the same period of recent days and the normal value of the ambient temperature of the skid-mounted high-voltage variable frequency electric control device in the same period of recent days of the spatiotemporal big data. The weight of the internal space temperature of yesterday is set to 0.6, the weight of the internal space temperature of the day before yesterday is set to 0.5, and the weight of the internal space temperature of the day before yesterday is set to 0.4. After calculating the weighted average, the center value of the ambient temperature at the same time from yesterday to the day before yesterday is added, and then the initial opening of the on-off part 73 and each opening and closing part is set at the beginning of each time. For example, if the predicted temperature is greater than the first gradient, it is set to the maximum opening.

[0086] Specifically, when the skid-mounted high-voltage frequency conversion electronic control device is operating in the anti-condensation state and performing winter air replenishment, the distributed control unit 62 transmits information to the remote controller 61 through serial communication according to the design requirements of the operating environment temperature. When the remote controller 61 reaches the warning value based on the collected information, it issues a warning instruction to prompt the on-off part 73 of the heat recovery chamber 17 to start the heat recovery chamber 17. The heat discharged from the frequency conversion cabinet is led to the heat recovery chamber 17 through the heat recovery chamber 17, and after being mixed with the new fresh air flowing in from the outside, it passes through the new fresh air unit and enters the skid, that is, the interior of the skid-mounted high-voltage frequency conversion electronic control device, to meet its operating environment requirements.

[0087] The remote controller 61 and the distributed control unit 62 may be a central processing unit (CPU), a general processor (such as a single-chip microcomputer), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic controller (PLC), etc. The general processor may be a microprocessor or any conventional processor, etc. Further, the distributed control unit 62 may also be an IC (microcircuit) circuit with a digital-to-analog conversion function. The control logic executed by the remote controller 61 and the distributed control unit 62 may be executed by a hardware processor, or by a combination of hardware and software modules in the processor.

[0088] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A skid-mounted high-voltage frequency conversion electric control device, characterized in that: include: The device body (7) is a skid block of a skid-mounted high-voltage variable-frequency electric control room, having a vent for heat dissipation and ventilation and an internal space separated from the vent; A fresh air system (1) is integrated with the device body, comprising a fresh air fan (11), an air mixing duct (15) and a refrigeration module, wherein the fresh air fan (11) is provided with an air inlet and an air outlet, the air mixing duct (15) is arranged in an outer wall interlayer (741) of the device body (7), the air mixing duct (15) is connected with the air outlet and the internal space respectively, and an opening and closing portion (14) for controlling the connection and isolation between the air mixing duct (15) and the internal space is provided at the connection point between the air mixing duct (15) and the internal space; the refrigeration module is used to reduce the air flow temperature in the air mixing duct (15); An internal space temperature detection module (4), a detection end of which is arranged on the outer wall (74) of the device body (7) and is used to obtain the external ambient temperature; A humidity sensing module, the detection end of which is arranged inside the air mixing duct (15) and is used to obtain the humidity inside the air mixing duct (15); The control module (6) is communicatively connected with the device body (7), the fresh air fan (11), the opening and closing portion (14), the refrigeration module, the internal space temperature detection module (4) and the humidity sensing module, and is used to control the air volume of the fresh air fan (11), the opening degree of the opening and closing portion (14) and the refrigeration capacity of the refrigeration module according to the operating state of the device body (7), the ambient temperature and the humidity.

2. The skid-mounted high-voltage frequency conversion electric control device according to claim 1 is characterized in that: The refrigeration module comprises a cold air blower (16); The cold air fan (16) and the fresh air fan (11) are installed in an installation cavity enclosed by a plurality of packaging walls (113), and the packaging walls (113) are installed on the outer wall (74); The air inlet is connected to the refrigeration air duct of the cold air blower (16), and the air inlet is provided with an exhaust blocking portion to prevent the airflow from flowing back into the cold air blower (16).

3. The skid-mounted high-voltage frequency conversion electric control device according to claim 2 is characterized in that: The air inlet of the cooling air blower (16) is provided with a sand-proof louver (12), a filter (13) and a sand-proof peak sheet in sequence along the airflow direction; The blades of the sand-proof shutter (12) have a bent structure, and the bent structures of two adjacent blades are arranged in a staggered manner to form a serpentine airflow channel; The airflow flowing into the cold air blower (16) carries impurities, passes through the airflow channel and the filter (13), so that the airflow is separated from part of the impurities, and then impacts the anti-sand peak sheet, so that the remaining impurities are blocked by the anti-sand peak sheet and naturally fall down and are separated from the airflow.

4. The skid-mounted high-voltage frequency conversion electric control device according to claim 2 is characterized in that: The fresh air system (1) further comprises a heat recovery chamber (17), and the device body (7) further comprises a connecting pipeline (72) connected to the vent; One side wall of the heat recovery chamber (17) is assembled with and communicated with the connecting pipe (72), and the other side wall is assembled with and communicated with the air inlet, and the fresh air fan (11) is also provided with a through hole that is communicated with the outside; A connection portion between the vent and the heat recovery chamber (17) is provided with a switching portion (73) for controlling on and off; The air inlet is connected to the air inlet through the heat recovery chamber (17), and the heat recovery chamber (17) is connected to the outside through the louver.

5. The skid-mounted high-voltage frequency conversion electric control device according to claim 4 is characterized in that: Installing at least two sets of the fresh air systems (1) on the outer wall (74); The air inlets of the plurality of cold air fans (16) are all connected to the same heat recovery chamber (17); The heat recovery chamber (17) has a plurality of polygonal mixed airflow chambers (171) inside, and the plurality of mixed airflow chambers (171) form a honeycomb structure for mixing the airflows of the connecting pipeline (72) and the air inlet; The control module (6) comprises a remote controller (61) and a distributed control unit (62); The plurality of distributed control units (62) are correspondingly connected in communication with the plurality of opening and closing parts (14), the plurality of humidity sensing modules and the plurality of on-off parts (73) of the plurality of fresh air systems (1), and are connected in communication with a remote controller (61). The remote controller (61) is also connected in communication with the main controller of the device body (7), so that the remote controller (61) can coordinately control the operating status of the device body (7) and the operating status of the plurality of fresh air systems (1).

6. The skid-mounted high-voltage frequency conversion electric control device according to any one of claims 1 to 5, characterized in that: It also includes an internal temperature detection module (3) for detecting the internal temperature of the device body (7), and / or an air flow velocity detection module (2) for detecting the air flow velocity of the air mixing duct (15), and / or an internal space air quality detection module (5) disposed on the outer wall (74) for detecting the air quality of the internal space; The control module (6) sets the initial cooling capacity of the refrigeration module according to the ambient temperature and the internal temperature, and / or the control module (6) sets the initial opening degree of the opening and closing portion (14) according to the air flow rate, and / or the control module (6) sets the initial air output volume of the fresh air fan (11) at least according to the air quality.

7. A control method using the skid-mounted high-voltage frequency conversion electric control device according to any one of claims 1 to 6, characterized in that: include: The control module (6) receives the operating status of the device body (7), the ambient temperature obtained by the internal space temperature detection module (4), and the humidity obtained by the humidity sensing module, and controls the air output of the fresh air fan (11), the opening degree of the opening and closing part (14), and the cooling capacity of the refrigeration module according to the operating status, the ambient temperature, and the humidity.

8. The control method of the skid-mounted high-voltage frequency conversion electric control device according to claim 7, characterized in that: The control module (6) determines the anti-condensation state, heat dissipation state or normal state of the skid-mounted high-voltage variable frequency electric control device according to the operating state, the ambient temperature and the humidity; In the anti-condensation state, the control module (6) controls the fresh air fan (11) to operate at a first air output volume, the opening and closing portion (14) to open at a first opening degree, and the refrigeration module to not perform refrigeration, so that the hot air dissipated by the device body (7) and the cold air discharged by the fresh air fan (11) will not generate condensed liquid after mixing in the air mixing duct (15); In the heat dissipation state, the control module (6) controls the fresh air fan (11) to operate at the second air output volume, the opening and closing portion (14) to close, and the refrigeration module to operate at the first refrigeration volume; In a normal state, the control module (6) controls the fresh air fan (11) to operate at a third air output volume, the opening and closing portion (14) to open at a second opening degree greater than the first opening degree, and the refrigeration module does not perform refrigeration.

9. The control method of the skid-mounted high-voltage variable-frequency electric control device according to claim 8, characterized in that: The high-voltage variable frequency electric control device further comprises an internal temperature detection module (3) for detecting the internal temperature of the device body (7), an air flow velocity detection module (2) for detecting the air flow velocity inside the air mixing duct (15), and an internal space air quality detection module (5) for detecting the air quality of the internal space; The control method comprises: In the heat dissipation state, the control module (6) sets the initial cooling capacity of the cooling module according to the difference between the ambient temperature and the internal temperature, and sends a signal to reduce the output frequency to the device body (7) when it is determined that the initial cooling capacity is greater than the upper limit of the cooling capacity; In the heat dissipation state, the control module (6) sets the initial opening degree of the opening and closing portion (14) according to the air flow velocity, and the control module (6) sets the initial air output volume of the fresh air fan (11) at least according to the air quality; During the operation of the fresh air fan (11), the control module (6) dynamically adjusts the first air output volume, the second air output volume or the third air output volume of the fresh air fan (11) according to the air flow velocity.

10. The control method of the skid-mounted high-voltage frequency conversion electric control device according to claim 8, characterized in that: The fresh air system (1) further comprises a heat recovery chamber (17), wherein the heat recovery chamber (17) is connected to the vent and the air inlet, and a switch (73) for controlling conduction and shutoff is provided at the connection point between the vent and the heat recovery chamber (17), wherein the switch (73) has an air pressure sensor, and the heat recovery chamber (17) has an air flow velocity sensor for detecting the mixed air flow chamber (171) of the honeycomb structure; In the anti-condensation state, the following steps are included: Step S1, the control module (6) stores a plurality of the ambient temperatures, a plurality of the humidity levels and a plurality of the operating states to generate a history database; Step S2: When the control module (6) determines, based on the historical database, that the device body (7) is in an abnormal working state, the control module (6) sends an alarm signal to the device body (7); Step S3, based on the comparison result between the historical database and the safety threshold, determine whether to open the on-off part (73); if it is determined that the on-off part (73) is opened, obtain the air pressure value collected by the air pressure sensor and the flow rate value collected by the air flow rate sensor, set the conductivity between the heat recovery chamber (17) and the outside world according to the air pressure value, and perform dynamic PID control on the conductivity of the on-off part (73) according to the flow rate value and the conductivity.

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