A skid-mounted high-voltage frequency conversion electric control device and its control method

Abstract

The present 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, comprising: a device body, which is a skid block of a skid-mounted high-voltage variable-frequency electric control room, having vents and an internal space for heat dissipation and ventilation; a fresh air system, which is integrated with the device body and includes a fresh air blower, a mixed air duct, and a refrigeration module, wherein the mixed air duct is arranged in an outer wall interlayer of the device body and is connected to the air outlet of the fresh air blower and the internal space respectively; the refrigeration module is used to reduce the air flow temperature in the mixed air duct; and further comprises an internal space temperature detection module, a humidity sensing module, and a control module. The present invention prevents the overcooled fresh air from directly entering the internal space, contacting the high-temperature air inside to produce condensed water, and the condensed water from flowing back to endanger the safe operation of the device body by mixing the cold air blown in by the fresh air blower with the heat dissipation air of the device body before entering the internal space of the device body.

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

[0003] The skid-mounted high-voltage frequency conversion electronic control unit is an integrated device based on traditional civil-structure substations of 10kV and below, integrating high-voltage and frequency conversion functions. This device offers the advantages of a smaller footprint, shorter construction period, greater economic and environmental performance, enhanced environmental awareness, and greater suitability for unmanned operation.

[0004] However, the cooling methods of the current skid-mounted high-voltage variable frequency electronic control device cooling system include natural cooling, convection cooling and liquid cooling. Among them, convection cooling through fans has low efficiency and cannot meet the cooling needs in high temperature environments.

[0005] To address this issue, Chinese utility model patent No. 201120198172.6 proposes an intelligent cooling air control device for a skid-mounted high-voltage variable-frequency electronic control unit. This device uses a fresh air blower, replacing a fan, to introduce fresh air from outside to cool the device through convection. A compressor then draws in liquid from the skid-mounted high-voltage variable-frequency electronic control unit for compression and evaporation, achieving a dehumidification effect. However, this intelligent cooling air control device cannot fundamentally eliminate the generation of condensation, which could seriously harm the normal operation of the skid-mounted high-voltage variable-frequency electronic control unit.

[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 avoiding the 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 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 mixed air duct and the cooling capacity of the refrigeration module, so that 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, thereby realizing multiple functions of the fresh air system at different external temperatures.

[0008] To achieve the above objectives, the present invention proposes a skid-mounted high-voltage frequency conversion electric control device, comprising:

[0009] The device body 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;

[0010] A fresh air system is integrated with the device body and includes a fresh air fan, an air mixing duct, and a refrigeration module. The fresh air fan is provided with an air inlet and an air outlet. The air mixing duct is provided in the outer wall interlayer of the device body. The air mixing duct is connected to the air outlet and the internal space respectively. An opening and closing portion for controlling the connection and isolation between the air mixing duct and the internal space is provided at the connection point between the air mixing duct and the internal space. The refrigeration module is used to reduce the temperature of the air flow in the air mixing duct.

[0011] 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;

[0012] A humidity sensing module, whose detection end is arranged inside the mixed air duct, is used to obtain the humidity inside the mixed air duct;

[0013] A control module is communicatively connected to the device body, the fresh air blower, 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 blower, the opening degree of the opening and closing part and the cooling capacity of the refrigeration module according to the operating status of the device body, the ambient temperature and the humidity.

[0014] The present invention uses a fresh air fan to introduce an appropriate amount of fresh air into a mixed air duct connected to the high-voltage frequency conversion electronic control device body when the external temperature is low, so that the fresh air is mixed with the heat dissipation air of the device body in the mixed air duct to a suitable temperature that will not condense, thereby avoiding that the overcooled fresh air directly enters the interior of the skid and contacts the high-temperature air inside to generate condensed water, and the condensed water backflow endangers the safe operation of the device body, thereby ensuring the safe operation of the device body. Moreover, 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 heat dissipation.

[0015] Furthermore, the refrigeration module includes a cold air blower;

[0016] The cooling air blower and the fresh air blower are assembled in an installation cavity formed by a plurality of packaging walls, and the packaging walls are mounted on the outer wall;

[0017] The air inlet is connected to the cooling air duct of the cold air blower, and the air inlet is provided with an exhaust blocking portion to prevent the air flow from flowing back into the cold air blower.

[0018] 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 sand-proof louvers, filters and sand-proof peak sheets in sequence along the air flow direction;

[0019] The blades of the sand-proof shutters have a bent structure, and the bent structures of two adjacent blades are staggered to form a serpentine airflow channel;

[0020] The airflow flowing into the cooling fan 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 fall naturally and are separated from the airflow.

[0021] 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 into the cold air blower will not affect the operation of the device body, and the cold air blower can operate stably.

[0022] Furthermore, the fresh air system further comprises a heat recovery chamber, and the device body further comprises a connecting pipe connected to the vent;

[0023] One side wall of the heat recovery chamber is assembled with and communicated with the connecting pipe, and the other side wall is assembled with and communicated with the air inlet, and the fresh air blower is further provided with a through hole communicated with the outside;

[0024] A switching part for controlling conduction and shutoff is provided at the connection point between the vent and the heat recovery chamber;

[0025] 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.

[0026] Furthermore, at least two sets of the fresh air systems are installed on the outer wall;

[0027] The air inlets of the multiple cooling fans are all connected to the same heat recovery chamber;

[0028] 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 from the connecting pipe and the air inlet;

[0029] The control module includes a remote controller and a distributed control unit;

[0030] The multiple distributed control units are correspondingly connected to the multiple opening and closing parts, multiple humidity sensing modules and multiple on-off parts of the multiple groups of fresh air systems, and are connected to a remote controller. The remote controller is also connected to the main controller of the device body so that the remote controller can coordinately control the operating status of the integrated device body and the operating status of the multiple groups of fresh air systems.

[0031] In particular, when the skid-mounted device body is placed in an environment with a lower external temperature, the air flow with a certain temperature can flow back into the fresh air blower through the heat recovery chamber, so that the temperature of the air flow inhaled and discharged by the fresh air blower will not be too low.

[0032] Furthermore, the high-voltage variable frequency electric control device further includes 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 provided on the outer wall and is used to detect the air quality of the internal space;

[0033] 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.

[0034] To achieve the above objectives, the present invention further provides a control method for a skid-mounted high-voltage variable-frequency electric control device, comprising:

[0035] 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.

[0036] Furthermore, the control module determines whether the skid-mounted high-voltage variable-frequency electric control device is in an anti-condensation state, a heat dissipation state, or a normal state according to the operating state, the ambient temperature, and the humidity;

[0037] In the anti-condensation state, the control module controls the fresh air blower to operate at a first air output 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 from the device body and the cold air discharged from the fresh air blower are mixed in the air mixing duct without generating condensed liquid;

[0038] In the heat dissipation state, the control module controls the fresh air blower to operate at the second air output volume, the opening and closing part to be closed, and the refrigeration module to operate at the first refrigeration volume;

[0039] 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.

[0040] Furthermore, the high-voltage variable frequency electric control device further includes an internal temperature detection module for detecting the internal temperature of the device body, an air flow rate detection module for detecting the air flow rate inside the air mixing duct, and an internal space air quality detection module for detecting the air quality of the internal space;

[0041] The control method includes:

[0042] In the heat dissipation state, the control module sets an 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;

[0043] 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 output volume of the fresh air blower at least according to the air quality;

[0044] 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.

[0045] Furthermore, the fresh air system further comprises a heat recovery chamber, the heat recovery chamber is in communication 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;

[0046] In the anti-condensation state, the following steps are included:

[0047] 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;

[0048] 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;

[0049] Step S3: Determine whether to open the on-off part based on the comparison result between the historical database and the safety threshold; 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 world 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.

[0050] Compared with the prior art, the present invention has the following advantages:

[0051] 1. It prevents the overcooled fresh air from directly entering the skid and contacting the high-temperature air inside to generate condensed water, which in turn causes condensed water backflow and harms the safe operation of the device, thus ensuring the safe operation of the device.

[0052] 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

[0053] Figure 1 This is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention;

[0054] Figure 2 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part A;

[0055] Figure 3 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part B;

[0056] Figure 4 An embodiment of the present invention Figure 1 Schematic diagram of the local structure of part C;

[0057] Figure 5 This is a schematic diagram of the partial structure of the outer wall of a skid according to an embodiment of the present invention;

[0058] Figure 6 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure of the opening and closing parts of the inner and outer walls;

[0059] Figure 7 Another embodiment of the present invention is Figure 5 Schematic diagram of the partial structure of the opening and closing parts of the inner and outer walls;

[0060] Figure 8 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure on one side of the opening and closing part of the inner and outer walls;

[0061] Figure 9 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure of the shutters on one side of the middle and outer walls;

[0062] Figure 10 This is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to another embodiment of the present invention;

[0063] Figure 11 This is a schematic diagram of the overall implementation of the skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention;

[0064] Figure 12 1 is a schematic diagram of a system of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention;

[0065] Figure 13 This is a schematic diagram of the overall flow of a control method for a skid-mounted high-voltage variable-frequency electric control device according to an embodiment of the present invention;

[0066] Figure 14 The figure 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.

[0067] 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. Sand-proof shutter; 121. Hinge mechanism; 122. Motor compartment; 123. Shutter; 124. Lock assembly; 125. Aluminum alloy outer wall; 13. Filter; 14. Opening and closing part; 141. Hydraulic transmission mechanism; 142. Shutter; 143. Fan speed control device; 144. Connecting rod mechanism; 15. Mixed air duct; 16. Cold air fan; 17. Heat recovery chamber; 171. Mixed air 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 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 pipe; 721. Heat recovery chamber hydraulic transmission mechanism; 722. Heat recovery chamber louvers; 723. Heat recovery chamber fan speed control device; 724. Heat recovery chamber connecting rod mechanism; 73. On-off part; 74. Outer wall; 741. Outer wall interlayer; 742. Filter; 743. Outer wall opening and closing part; 7431. Outer wall hydraulic transmission mechanism; 7432. Outer wall louvers; 7433. Outer wall fan speed control device; 7434. Outer wall connecting rod mechanism; 7435. Outer wall fan; 7436. Signal collector; 744. Control box; 745. Double corrugated louvers. DETAILED DESCRIPTION

[0068] 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 merely used to explain the present invention and are not intended to limit the present invention.

[0069] 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 scope of protection of the present invention.

[0070] 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 accompanying drawings. This is only 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.

[0071] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0072] like Figures 1 to 14 As shown, the present invention provides a skid-mounted high-voltage variable-frequency electronic control device and a control method thereof, wherein an appropriate amount of fresh air is introduced through the fresh air fan 11 and mixed with the heat dissipation air of the device body 7 to a suitable temperature that will not condense, thereby avoiding the 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 backflow endangering the safe operation of the device body; the present invention also controls the opening degree of the opening and closing part 14 of the mixed air duct 15 and the cooling capacity of the refrigeration module, so that 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 multiple functions of the fresh air system 1 at different external temperatures.

[0073] in, Figure 1 This 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 This is a schematic diagram of the partial structure of the outer wall of a skid according to an embodiment of the present invention; Figure 6 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure of the opening and closing parts of the inner and outer walls; Figure 7Another embodiment of the present invention is Figure 5 Schematic diagram of the partial structure of the opening and closing parts of the inner and outer walls; Figure 8 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure on one side of the opening and closing part of the inner and outer walls; Figure 9 An embodiment of the present invention Figure 5 Schematic diagram of the partial structure of the shutters on one side of the middle and outer walls; Figure 10 This is a schematic structural diagram of a skid-mounted high-voltage frequency conversion electric control device according to another embodiment of the present invention; Figure 11 This is a schematic diagram of the overall implementation of the skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Figure 12 1 is a schematic diagram of a system of a skid-mounted high-voltage frequency conversion electric control device according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the overall flow of a control method for a skid-mounted high-voltage variable-frequency electric control device according to an embodiment of the present invention; Figure 14 This 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;

[0074] The components include a fresh air system 1, a fresh air blower 11, a centrifugal blower 111, an exhaust duct 112, a packaging wall 113, a sand-proof shutter 12, a hinge mechanism 121, a motor compartment 122, shutters 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, an air mixing duct 15, a cold air blower 16, a heat recovery chamber 17, a mixed air flow chamber 171, a partition plate 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, an internal space air quality detection module Measurement module 5, control module 6, remote controller 61, distributed control unit 62, device body 7, exhaust duct 71, wind hood 711, air duct flange 712, connecting pipe 72, heat recovery chamber hydraulic transmission mechanism 721, heat recovery chamber louvers 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 louvers 7432, outer wall fan speed regulating device 7433, outer wall connecting rod mechanism 7434, outer wall fan 7435, signal collector 7436, control box 744, double corrugated louvers 745. Example 1

[0075] 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, an air mixing duct 15 and a refrigeration module, 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 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 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 The air flow temperature in the mixed air duct 15; the internal space temperature detection module 4, the detection end of which is arranged on the outer wall 74 of the device body 7, for obtaining the external ambient temperature; the humidity sensing module, the detection end of which is arranged inside the mixed air duct 15, for obtaining the humidity inside the mixed air duct 15; the 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 outlet 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 of the device body 7, the ambient temperature and the humidity.

[0076] It should be noted that the fresh air system 1 is integrated with the device body 7. The fresh air system 1 cannot be used alone and must work in conjunction with the device body 7. This structure is intended to address the condensation prevention and heat dissipation issues of the skid-mounted high-voltage variable-frequency electronic control device when installed in various environments. The fresh air system 1 can be integrated with the device body 7 as an external device or as an internal device, both being encapsulated by a housing.

[0077] It should be noted that the exterior described in this embodiment refers to the exterior of the entire skid-mounted high-voltage variable-frequency electric control device.

[0078] 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 backflow endangering 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.

[0079] 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 formed 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 cooling air duct of the cold air fan 16, and the air inlet is provided with an exhaust blocking part to prevent the air flow from flowing back into the cold air fan 16.

[0080] 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.

[0081] 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.

[0082] Further, if Figure 1 As shown, the air inlet of the cold 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 fan blades of the sand-proof louver 12 have a bending structure, and the bending structures of each two adjacent fan blades are staggered 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 to separate the airflow 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 naturally fall down and are separated from the airflow.

[0083] 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 into the cold air blower 16 will not affect the operation of the device body 7, and the cold air blower 16 can operate stably.

[0084] Specifically, a sand collecting portion is further provided at the air inlet of the cold air blower 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.

[0085] Specifically, such as Figure 1 As shown, the sand-proof louver 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 secondary dust filter. The double-wave-shaped air intake structure forcibly changes the direction of the incoming air, allowing air to enter the room through two cyclic paths. When sand particles are blown in by the wind and hit the sand-proof peaks, they automatically fall and flow out. The sand-proof louver 12 effectively prevents sand and dust from entering the cooling fan 16.

[0086] More specifically, Figure 9As shown, the blades of the sand-proof louver 12 are connected to a motor via a hinge mechanism 121. The motor is housed in a motor compartment 122 and is in communication with the distributed control unit 62 of the control module 6. The blades are also connected to a lock assembly 124 for manually controlling their opening and closing. In other possible embodiments, the hinge mechanism 121 and motor can be replaced with a hydraulic transmission mechanism.

[0087] Furthermore, the fan blades are hollow aluminum alloy with insulation material inside, providing excellent thermal insulation. When the ambient temperature is too low, the control module 6 controls the blades of the sand-proof louvers 12 to open for a set period of time and then close, thereby achieving internal circulation in the fresh air system 1. This prevents the fresh air fan 11 from inhaling excessively cold external airflow, which would cause the airflow in the mixed air duct 15 to become too cold. This ensures that the fresh air system 1 dissipates heat appropriately without causing the skid-mounted high-voltage variable-frequency electronic control device to lose temperature.

[0088] Specifically, if Figures 5 to 9 As shown, the vertical outer wall 74 of the device body 7 is provided with a filter screen 742, an outer wall opening and closing portion 743, a control box 744, and a double corrugated shutter 745. The double corrugated shutter 745 preferably has the same structure as the sand-proof shutter 12, and the filter screen 742 preferably has the same structure as the filter 13. Therefore, the double corrugated shutter 745 can 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.

[0089] Specifically, such as Figure 1 As shown, an exhaust blocking portion is further provided on one side of the sand peak preventing plate of the air inlet of the cooling air blower 16 along the air flow direction. The exhaust blocking portion can be an exhaust wind umbrella and its fixing assembly.

[0090] 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 blower 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 cooling air duct and the air inlet, or the interior of the heat recovery chamber 17 has a plurality of polygonal mixed air flow chambers 171, and the plurality of mixed air flow chambers 171 form a honeycomb structure for mixing the airflow of the connecting pipe 72 and the air inlet.

[0091] like Figure 14As shown, the heat recovery chamber 17 has a plurality of polygonal mixed airflow chambers 171 therein. The plurality of mixed airflow chambers 171 form a honeycomb structure for mixing the airflow from the connecting pipe 72 and the air inlet.

[0092] Specifically, if Figure 14 As shown, the heat recovery chamber 17 is provided with a cross-shaped partition plate 172, forming four partitions. The partition plate 172 has fine holes to allow the airflow between the partitions to communicate with each other. Each partition is provided with multiple mixed airflow chambers, which extend the flow path of the airflow within the heat recovery chamber 17 and ensure that the external airflow entering the heat recovery chamber 17 through the louvers and the hot airflow entering from the connecting pipe 72 can be fully mixed. The mixed airflow chamber 171 is preferably a regular hexagon.

[0093] Specifically, the connecting pipe 72 can be a ventilation hose to facilitate the coordinated installation of the heat recovery chamber 17 and the device body 7 .

[0094] In particular, when the external temperature is low, the airflow with a certain temperature can flow back into the fresh air blower 11 through the heat recovery chamber, so that the temperature of the airflow discharged by the fresh air blower 11 will not be too low.

[0095] Furthermore, the high-voltage variable frequency electronic control device 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 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.

[0096] 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 The heat recovery chamber opening and closing portion is provided at the connection point of the exhaust pipe 71 and the connecting pipe 72 shown in the figure. 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. In this embodiment, Figures 5 to 8The outer wall 74 (specifically, the sidewalls of the device body 7 and the skid) is provided with an outer wall opening and closing portion 743. This outer wall opening and closing portion 743 includes an outer wall hydraulic transmission mechanism 7431, outer wall shutters 7432, an outer wall fan speed control device 7433, an outer wall connecting rod mechanism 7434, an outer wall fan 7435, and a signal collector 7436. The fan speed control device 143, the heat recovery chamber fan speed control device 723, and the outer wall fan speed control device 7433 are speed-regulating motors, preferably variable-frequency motors.

[0097] The connecting rod mechanism 144 / heat recovery chamber connecting rod mechanism 724 / outer wall connecting rod mechanism 7434 includes a driving rod and several connecting rods whose ends are fixed on 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.

[0098] 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, it is 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.

[0099] Specifically, if Figure 5 and 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.

[0100] Specifically, if Figure 8 As shown, the remote controller 61 or the distributed control unit 62 preferably communicates with the fan speed control device 143 and the outer wall fan speed control 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 inside and outside the outer wall 74 into electrical signals.

[0101] As a specific embodiment, 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.

[0102] Specifically, the overall implementation of the skid-mounted high-voltage variable frequency electric control device described in this embodiment is as follows: Figure 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.

[0103] Specifically, the first valve 181, the second valve 182, the louvers 142, the heat recovery chamber louvers 722, and the outer wall louvers 7432 are all temperature controlled and opened and closed according to set conditions, specifically:

[0104] An electric heating plate is also installed inside the fresh air blower 11 for heating the skid during winter and maintenance seasons. When the temperature drops below 5°C (adjustable), the second valve 182 and heat recovery chamber louvers 722 open, while the first valve 181, outer wall louvers 7432, and louvers 142 close. When the temperature reaches 15°C (adjustable), the second valve 182 and heat recovery chamber louvers 722 close, while the first valve 181, outer wall louvers 7432, and louvers 142 open. This control is performed by the fresh air unit's control box, or remote controller 61. (All louvers are DC24 electric, three-wire controlled, with wiring terminals reserved in the control box.)

[0105] When the temperature inside the skid reaches 25°C, the second valve 182 opens, the first valve 181 and the heat recovery chamber louvers 722 are closed, and fresh air is introduced for cooling.

[0106] When the temperature inside the skid reaches 35°C, the cooling fan 16 is turned on to assist in cooling. When it drops to 30°C, the cooling fan 16 is turned off. During this period, the fresh air fan 11 can normally supply air.

[0107] According to the setting of the pressure differential gauge, when the air inlet and outlet pressures of the fresh air blower 11 reach the preset values, an alarm is issued, prompting the filter 13 and the filter screen 742 to be cleaned or replaced.

[0108] The system structure of the skid-mounted high-voltage frequency conversion electronic control device is as follows: Figure 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 three speed control gears: high, medium and low. 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.

[0109] The working process of the skid-mounted high-voltage frequency conversion electronic 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 blower 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 blower 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.

[0110] Therefore, in this embodiment, an appropriate amount of fresh air is introduced through the fresh air blower 11 and mixed with the heat dissipation air of the device body 7 to a suitable temperature that will not condense, thereby fundamentally avoiding the overheated heat dissipation air from coming into contact with the external low-temperature air to produce condensed water, and the reflux of condensed water causing harm to 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 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. Example 2

[0111] 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 the fresh air system 1 is provided with at least two groups.

[0112] 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. 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.

[0113] Furthermore, a switching part for controlling conduction and shutdown is provided at the connection point between the ventilation port and the heat recovery chamber 17; the air inlet of the fresh air fan 11 is connected to the internal space through the cooling air duct of the cold air fan 16 and the heat recovery chamber 17.

[0114] 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.

[0115] Preferably, Figure 10 As shown, the fresh air system 1 is symmetrically arranged in two groups. The air inlets of the two groups of cold air blowers 16 are connected to the heat recovery chamber 17, which has 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. The vent is the opening of the exhaust duct 71, which is connected to the heat recovery chamber 17 through a connecting duct 72.

[0116] 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 blower 11 through the heat recovery chamber 17, so that the temperature of the air flow discharged by the fresh air blower 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. Example 3

[0117] 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.

[0118] Furthermore, the control module 6 determines whether the skid-mounted high-voltage variable-frequency electronic control device is operating in an anti-condensation state, a heat dissipation state or a normal state based on 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 not to perform refrigeration.

[0119] It is understood that the anti-condensation state is operated when the interior 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 operating state. At this time, the heat dissipation hot air that has reached a high temperature can be prevented from directly contacting the cold air in the interior space to produce condensation water. The heat dissipation state is operated when the interior 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 operating state. At this time, the cold air from the fresh air blower 11 passing through the refrigeration module is used to accelerate the heat dissipation of the device body 7 at the vent. The normal state is operated when the temperature of the interior 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 operating state. At this time, the fresh air system 1 can operate in a low-power, low-energy consumption mode. 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.

[0120] 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 cooling capacity upper limit, 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 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 airflow velocity.

[0121] It is understood that the control module 6 adjusts the first air volume of the fresh air fan 11 based on the airflow velocity. This ensures that when the interior space of the skid-mounted high-voltage variable-frequency electronic control device is relatively cold, the high airflow velocity of the fresh air fan 11 prevents the cold air discharged from the fresh air fan 11 from being fully mixed and discharged with the heat dissipating hot air from the device body 7, thereby preventing condensation from occurring in the air mixing duct 15. The control module 6 adjusts the second and third air volumes of the fresh air fan 11 based on the airflow velocity to ensure a moderate exhaust air velocity from the fresh air fan 11 and a moderate heat dissipation efficiency for the skid-mounted high-voltage variable-frequency electronic control device.

[0122] Furthermore, the control module 6 sets the opening degree threshold and the air volume threshold of the fresh air blower 11 according to the air quality. 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 blower 11 is controlled to operate at the air volume threshold. Thus, the fresh air system 1 is ensured not to inhale excessive wind and sand.

[0123] 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 cooling capacity upper limit, 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 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 airflow velocity.

[0124] Specifically, the output frequency is the output frequency of the frequency converter of the device body 7 .

[0125] 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. 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 achieve remote monitoring and data recording. Through real-time integration and processing of the data, the remote controller 61 determines whether to issue an instruction information to start the opening and closing part 14 and the fresh air fan 11 based on the collected information. The instruction information is sent to the distributed control unit 62. The distributed control unit 62 determines whether to start the hydraulic transmission device based on the instruction information to open the shutter 142 of the opening and closing part 14 and start the fan speed control 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, thereby realizing the intelligent fresh air supply of the intelligent fresh air fan 11.

[0126] 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 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 start the cooling air blower 16 to meet the operating environment requirements.

[0127] Specifically, the opening degree of the opening and closing portion 14 , that is, the size and number of the ventilation holes opened by the louvers 142 of the opening and closing portion 14 , is set accordingly according to the air output of the fresh air blower 11 .

[0128] 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, it is determined whether to open the on-off part 73, if it is determined that the on-off part 73 is opened, 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.

[0129] It can be seen from the experiment that the air pressure value reflects the overflow degree of the airflow in the heat recovery chamber 17. When a large amount of airflow flows into the louvers 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 far more than the hot airflow of the connecting pipe 72, and it cannot achieve the purpose of mixing into an airflow with a more suitable temperature and not too cold. Therefore, the difference between the set air pressure value and the standard value is inversely proportional to the opening angle of the louver. When the air pressure is high and the louver cold airflow is large, the inflow of the louver cold airflow is reduced. 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.

[0130] The conductance is the opening angle of the louver. 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 conductance of the on-off portion 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 perform 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 perform a medium-speed, 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, smooth adjustment. The standard flow rate value is proportional to the conductance, and its proportional coefficient is preferably 65.

[0131] Furthermore, the remote controller 61 is equipped with a spatiotemporal big data system, which fits the predicted temperature for the day based on the temperature changes in the internal space in recent days, and then sets the initial opening of the on-off section 73 and the opening and closing section. Specifically, the predicted temperature at this time is the weighted average of the temperatures in the same period of the 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 the recent days in the spatiotemporal big data. The weight of yesterday's internal space temperature 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 section 73 and each opening and closing section 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.

[0132] Specifically, when the skid-mounted high-voltage variable-frequency electronic control device is operating in the anti-condensation state and performing winter air supply, 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 variable-frequency electronic control device, to meet its operating environment requirements.

[0133] The remote controller 61 and the distributed control unit 62 may be a central processing unit (CPU), a general-purpose processor (e.g., a single-chip microcomputer), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic controller (PLC), etc. The general-purpose processor may be a microprocessor or any conventional processor. Furthermore, the distributed control unit 62 may 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.

[0134] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0135] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection 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 frequency conversion 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 and comprises a fresh air blower (11), an air mixing duct (15) and a refrigeration module, wherein the fresh air blower (11) is provided with an air inlet and an air outlet, the air mixing duct (15) is provided in an outer wall interlayer (741) of the device body (7), the air mixing duct (15) is connected to the air outlet and the internal space respectively, and an opening and closing portion (14) for controlling the connection and isolation of 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), whose detection end 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, a detection end of which is arranged inside the mixed air duct (15) and is used to obtain the humidity inside the mixed air duct (15); The control module (6) is communicatively connected with the device body (7), the fresh air blower (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 output of the fresh air blower (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, characterized in that: The refrigeration module includes a cold air blower (16); The cold air blower (16) and the fresh air blower (11) are assembled in an installation cavity enclosed by a plurality of packaging walls (113), and the packaging walls (113) are mounted on the outer wall (74); The air inlet is connected to the cooling air duct of the cold air blower (16), and the air inlet is provided with an exhaust blocking portion for preventing the air flow from flowing back into the cold air blower (16).

3. The skid-mounted high-voltage frequency conversion electric control device according to claim 2, 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 louver (12) have a bent structure, and the bent structures of two adjacent blades are staggered to form a serpentine airflow channel; The airflow flowing into the cooling fan (16) carries impurities, passes through the airflow channel and the filter (13), 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, characterized in that: The fresh air system (1) further includes a heat recovery chamber (17), and the device body (7) further includes a connecting pipe (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 blower (11) is also provided with a through hole 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 world through louvers.

5. The skid-mounted high-voltage frequency conversion electric control device according to claim 4, 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 cooling air blowers (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 pipe (72) and the air inlet; The control module (6) includes a remote controller (61) and a distributed control unit (62); The plurality of distributed control units (62) are correspondingly connected to 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 to a remote controller (61). The remote controller (61) is also connected to 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 mixed air 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 variable-frequency 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 blower (11), the opening degree of the opening and closing portion (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 variable-frequency 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 blower (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 blower (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 blower (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 blower (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 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 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 blower (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 blower (11) according to the air flow velocity.

10. The control method of the skid-mounted high-voltage variable-frequency electric control device according to claim 8, characterized in that: The fresh air system (1) further comprises a heat recovery chamber (17), the heat recovery chamber (17) being in communication with the vent and the air inlet, a switching unit (73) for controlling on and off being provided at the connection point between the vent and the heat recovery chamber (17), the switching unit (73) having an air pressure sensor, and the heat recovery chamber (17) having 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.

Images